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SEPA Determination City of Yelm Case #20090210 Yelm Rainier Transportation CntrIPM.Note SEPA Determination, City of Yelm, Case #20090210 Yelm Rainier Transportation Cntr Karen Bennett SEPA Determination, City of Yelm, Case #20090210 Yelm Rainier Transportation Cntr Karen Bennett EX /o=CITYOFYELM/ou=first administrative group/cn=Recipients/cn=KarenB 'ebirkland@ycs.wednet.edu'; 'trent@jwmorrissette.com' SEPA Determination, City of Yelm, Case #20090210 Yelm Rainier Transportation Cntr 00000003SERVER1/o=CITYOFYELM/ou=first administrative group/cn=Recipients/cn=KarenBKarenB@ci.yelm.wa.us 00000003SERVER1/o=CITYOFYELM/ou=first administrative group/cn=Recipients/cn=KarenBKarenB@ci.yelm.wa.us Please find attached the SEPA determination documents for the City of Yelm, Case #20090210 Yelm Rainier Transportation Center. Karen T. Bennett City of Yelm 105 Yelm Avenue West PO Box 479 Yelm, WA 98597 (360)458-3835 Fax (360)458-3144 cid:image001.jpg@01C92D52.D536B3F0 Karen Bennett 12.0 KarenB@ci.yelm.wa.us 00000003SERVER1/o=CITYOFYELM/ou=first administrative group/cn=Recipients/cn=KarenB 'ebirkland@ycs.wednet.edu' SMTP ebirkland@ycs.wednet.edu ebirkland@ycs.wednet.edu ebirkland@ycs.wednet.edu 'trent@jwmorrissette.com' SMTP trent@jwmorrissette.com trent@jwmorrissette.com 09-0210 MDNS.pdf SEPA NO: 09-0210 MITIGATED DETERMINATION OF NONSIGNIFICANCE Proponent: Yelm Community Schools – Transportation Center Description of Proposal: Convert existing industrial site to a school bus transit center.. Location of the Proposal: 406 Railroad Street, Yelm, WA Section/Township/Range: Section 19, Township 17 North, Range 2E, W.M. TP# 22719310100, 22719310300, 22719310301, & 22719310200 Threshold Determination: The City of Yelm as lead agency for this action has determined that this proposal does not have a probable significant adverse impact on the environment. Therefore, an environmental impact statement (EIS) will not be required under RCW 43.21C.030(2)(c). This decision was made after review of a completed environmental checklist and other information on file with the lead agency. This information is available to the public on request. Conditions/Mitigating Measures: SEE ATTACHED Lead agency: City of Yelm Responsible Official: Grant Beck, Community Development Director Date of Issue: March 5, 2010 Comment Deadline: March 19, 2010 Appeal Deadline: March 26, 2010 Grant Beck, Community Development Director This Mitigated Determination of NonSignificance (MDNS) is issued pursuant to Washington Administrative Code 197-11-340 (2). Comments must be submitted to Tami Merriman, Community Development Department, at City of Yelm, 105 Yelm Avenue West, Yelm, WA 98597, by March 19, 2010, at 5:00 P.M. The City of Yelm will not act on this proposal prior March 26, 2010, at 5:00 P.M. You may appeal this determination to the Yelm Hearing Examiner, at above address, by submitting a written appeal no later than March 26, 2010, at 5:00 P.M. You should be prepared to make specific factual objections. Contact Grant Beck, Community Development Director, to learn more about the procedures for SEPA appeals. This MDNS is not a permit and does not by itself constitute project approval. The applicant must comply with all applicable requirements of the City of Yelm prior to receiving construction permits which may include but are not limited to the City of Yelm Comprehensive Plan, Zoning Code (Title 17 YMC), Critical Areas Code (Chapter 14.08 YMC), Stormwater Drainage Design and Erosion Control Manual (DOE), International Building Code, State Environmental Policy Act (SEPA) (Title 14 YMC), Road Design Standards, Platting and Subdivision Code (Title 16 YMC), and the Shoreline Master Program. --------------------------- --------------------------DO NOT PUBLISH BELOW THIS LINE Published: Nisqually Valley News, March 5, 2010 Posted in public areas: Wednesday, March 3, 2010 Copies to: All agencies/citizens on SEPA mailing list and adjacent property owners Dept. of Ecology w/checklist ATTACHMENT SEPA Case Number 09-0210 Findings of Fact 1. This Mitigated Determination of Non Significance is based on the project as proposed and the impacts and potential mitigation measures reflected in the following environmental documents: • Environmental Checklist (September 2009, JW Morrissette) • Wetland Analysis Report (September 2009, Russell & Assoc.) • Preliminary Drainage Report (September 2009, JW Morrissette) • Mounding Analysis Report (January 2010, Landau Assoc.) 2. The City of Yelm has adopted a concurrency management system as required by the Growth Management Act. Chapter 15.40 YMC (Concurrency Management) is designed to ensure that the improvements required to support development are available at the time of development. A concurrency determination may be issued for a proposal as it relates to transportation issues when: the development provides on-site frontage improvements; the project makes off-site improvements as necessary to provide for the safe movement of traffic; and the project makes a contribution to projects identified the six year transportation improvement program in the form of a Transportation Facilities Charge. 3. The property fronts on Stevens Street which is constructed to City standards. The proposal creates fewer trips than the previous use of the site; no additional transportation improvements are required. 4. The Shoreline Management Act provides policies and regulations for development along Shorelines of the State. The Shoreline Master Program for the Thurston Region provides policies and regulations for development along Yelm Creek. The property is bordered on the east by Yelm Creek. No development is proposed to be located within the Shoreline Jurisdiction area. 5. Section 14.08.140(D)(2) YMC requires a 150 foot Riparian Habitat Buffer along Yelm Creek. The development on the site is proposed to be located outside the 150 foot Riparian Habitat Buffer. 6. There is a mapped FEMA 100 year flood zone area adjacent to Yelm Creek, which encompasses the creek and its associated wetlands. Section 15.32.280 YMC prohibits construction of residential structures or any construction that results in any increase in flood levels. All proposed development is located outside of the mapped FEMA 100 year flood plain. 7. There are two wetland areas located on site. They have both been classified as category III wetlands requiring an 80 foot buffer. All development on site is proposed to located outside the wetland buffers. 8. The City has adopted the 1992 Department of Ecology Drainage Design Manual, which requires that stormwater generated from development be treated for sediments before infiltration. 9. Section 14.08.120 YMC states that no development shall locate within 50 feet, measured on a horizontal plane, from the outer edge of the high ground water hazard area or extending to a ground elevation two feet above the base flood elevation, whichever is less. The bottom of any infiltration facility for stormwater discharge shall be located at least 6 feet above the base flood elevation. Modifications to the prescriptive standards for the protection of critical areas may be authorized by the City. 10. Results of the Mounding Analysis shows impacts greater than 0.5 feet on at the property border. Mitigation Measures 1. All development to remain outside of the Shoreline Jurisdiction Area, the Riparian buffer, the flood plain and wetland buffers. 2. Based on the results of the Mounding Analysis, the applicant has three options: (1) Add no additional impervious surfaces, in which case the existing stormwater facility can remain. (2) If additional impervious surfaces are added, the stormwater facility to be moved to the east to a point where the impact to the adjacent property is less than 0.5 feet. (3) Produce a signed agreement with the adjacent property owner that they do not object to the impact. 3. A hazardous spill containment plan shall be approved by Thurston County. $@RrssEt[ &Associnres #F Wetland Analysis Report of the Yelm Community Schools Proposed Transportation Center Prepared for: Yelm Community Schools c/o Erling Birkland PO Box 476 Yelm, Washington 98597 Prepared by: Russell and Associates l4l4 McCorkle Road Olympia, Washington 98501 September 2009 _qf t 2 5 ZCûg l4l4 McConkte Rd SE . Olyrupin. Washilrqroru g8t0l . pkone, (760,)7r2.1126 o Fnx: (rbO)rr2.lrrg Wetland Analysis Report Yelm Community Schools Proposed Transportation Center (Thurston County parcels) #22719310100,#227193L0300,#2271931030L,&#22719910200 INTRODUCTION This report discusses the identification, delineation and classification of wetlands associated with the Yelm Community Schools Proposed Transportation Center, located within the City of Yelm, in Thurston Counìy, washingion (Figure L, Vicinity Mup). The purpose of this wetland analysis report is to summaúzethe delineation and categotization of all wetlands on or adjacent to the property. This analysis is required by the City of Yelm Critical Areas Ordinance, Chãpter 14.08,ás revised. The proposed use of the site is to develop a transportation center on the property for Yelm Community Schools (Figure 2, Site MuÐ. As part of the proposedproject development, the City is requiring that all wetlánds be delineáted and categorized on the site. SETTING The project is located in Thurston County, in the central portion of Section 19, Township L7 North, Range 2East,w.M. The project areá is made up of four tax parcels, Thurston County parcels #22719310100,#22719310300, #22719iI0301, & #227193t0200. The total acreage of the project area is approximately 8.28 acres in size. The project site is essentially a rectangular shaped area that is located in the northwestern portion of the City of Yelm. The project site is bordered by Stevens Avenue along the southwest, and by old railroad right of way along the east. Commercial property is located norttr and west of the site. Access to the site is along Stevens Avenue. The project site is mostly developed, with a large scale industrial facility dominating the southeastern portion of the property. Slightly less than half of the site is dominated by buitdings and pave parking areas. Surrounding land use in the project vicinity is a mix of moderate density residential development, industrial and commercial uses, and undeveloped properties. yelm Creek, a seasonal stream, is located along the northern boundary of the site. It generally flows from east to west, where it joins the Nisqually River northwest of the project site. ^s(c'tnrotuo¿¡ t'Il Figure L. Project vicinity map. Yelm Community Schoots Proposed Transportation Center lletland Analys is Report September 2009 sEc. 1 g, T. 1: a,c lx\ \ ffi @icipal.CeotechnicalEngineering.LandSurveying Jerome W. Morrissette & Associates lnc., P.S. lT00Cooper Pt. Roâd S.W. #B-2, Olympia, Wa.98502-1il0 Ph 360.352.9456 Fx 360.352.9990 4 Topography of the project site is relatively flat in the southern two-thirds of the site, while the northern third of the property slopes downward to the floodplain of Yelm Creek. The floodplain of the creek has been historically disturbed through filling or material removal, and is topographically varied, specifically in the northeastern corner of the site. Soils in the project vicinity were mainly formed in glacial till, and gravelly glacial oufwash. Soils on the project site are mapped as Spanaway gravelly sandy loam, 0-3 percent slopes, and Spanaway stony sandy loam,3-15 percent slopes, and McKenna gravelly silt loam, 0-5 percent slopes (Figure 3, Soils Mup). The Spanaway series is described by the Natural Resource Conservation Service in the Soil Survey of Thurston County area, Washington, (USDA,1979) as being somewhat excessively drained, having been formed in gravelly glacial outwash. A typical profile is described as having a surface layer of black gravelly sandy loam about L5 inches thick. The subsoil is dark yellowish brown very gravelly loam about 5 inches thick. The substratum to a depth of 60 inches or more is dark yellowish brown extremely gravelly sand. The Spanaway stony sandy loam profile is essentially the same, but stony rather than gravelly. It is also excessively drained. Neither of these soil series is classified by the NRCS as a hydric soil (NRCS, 1991). The McKenna series is described as poorly drained, and formed in glacial drift. In a typical profile, the surface layer is black gravelly silt loam about 9 inches thick. The upper 4 inches of the subsoil is very dark grayish brown gravelly silt loam, and the next 8 inches is dark brown very gravelly silt loam and the lower L5 inches is dark brown and dark yellowish brown mottled very gravelly loam. Actual soils observed on the project are mostly consistent with the soil survey/although soils in the northern end of the site are not as extensively hydric as shown on the soil survey mapping. The majority of soils evaluated are gravelly sandy loam or gravelly loam in texture. Soils observed across most evaluated areas of the site are mainly 10YR 2/lblack gravelly sandy loam to a depth o1t2-I8 inches. Below this, is a10YR4/4 extremely gravelly sand to at least 24 inches in depth. No redoximorphic features were observed in these soils. Soils in isolated areas in the north-central portion of the site are more indicative of seasonal saturation. Soils in these areas are mostly consistent with the McKenna gravelly silt loam series description, which is often found in depressions and drainageways in association with the Spanaway series. Soils observed in these areas of the site are generally 10YR2/1 gravelly loam to at least 20 inches in depth. The only redoximorphic features Yelm Community Schools Proposed Transportation CenÍer Iletland Analysis Report September 2009 Figure 3. Soil Conservation Service soils map of the project area. Yelm Community Schools Proposed Transportation Center Iletland Analysis Report September 2009 observed in this soil were oxidized root zones in the upper l-2 inches of the soil profile. Vegetation across the northern and western ends of the project site are mainly dominated by scattered brush and trees, with grasses and forbs. The southeastern portion of the project area is encumbered with the existing industrial development and associated parking areas. Species observed across most of the northern and western ends of the site generally consists of Scotch broom, osoberry, tall Oregon grape, sweet vernal grass, orchard grass, coÍunon vetch, sheep sorrel, and trailing blackberry. Scattered along the northern end of the site are Oregon ash and black cottonwood trees. Species observed in the depressional areas in the northern central portion of the site are more indicative of moist or wet soil conditions. Species observed in these isolated areas include: hawthorne, Western crabapple, Nootka rose, and reed canarygrass. Oregon ash and black cottonwood are also present, but mainly around the perimeter of the depressional areas. Hydrology in the project area is mainly the result of groundwater or floodwater from the Yelm Creek corridor. Due to somewhat excessively drained soils throughout the Yelm Prairie, surface water and flow within the creek is sporadic, and typically only observed during limited periods during the wetter portion of the year. Two isolated depressional areas in the north central portion of the site, south of the creek, appear to be seasonally inundated, based on indicators observed. Indicators observed include water stained leaves, oxidized root zones, water marks, and algal deposits. During August field work, no hydrology was directly observed, but that is not unusual for many wetlands in Western Washington. However, it does appear that during heavy rainfall events, some soil saturation or inundation may occasionally be present. WETLANDS Field work to identify and delineate wetlands at the site was completed during three site visits, in August of 2009. Wetland determinations were made using observable vegetation, hydrology, and soils in accordance with the Corps of Engineers Wetlønd Delineation Mønuøl (Environmental Laboratory,I9ST), and the W øshington State W etlønds D elineøtion MønuøI (Ecology, 1997). Yelm Community Schools Proposed Transportation Center Wet land Analysis Report September 2009 7 Two distinct wetland areas have been delineated on the project site. A detailed description of each wetland is given below. The wetlands are also shown on the site map (Figure 2), and have been classified according to the USFWS system (Cowardin et al. L979), and categorized in accordance with the Washington State Department of Ecology rating system (WSDOE, t993). A rating sheet for each wetland is found in Appendix #1. In addition to the rating system, a functional assessment was performed using the Wetland and Buffer Functions Semi-Oualitative Assessment Methodology (Cooke, 1996). The assessment forms are included as Appendix #2. Scientific names of plant species are in Appendix #3. Data sheets are presented in Appendix#A. Wetland 1 Palustrine Emergent Persistent Seasonally Flooded (PEMIE) --Category m Wetland #1, is a depressional area located in the northern-central portion of the site, within the historic floodplain of Yelm Creek. The wetland is an isolated, closed depressional system, that has been impacted (either enlarged or reduced in size) by past earthwork in the floodplain area. Based on the delineation and survey, this wetland is 4,062square feet in size. The wetland was rated as a Category III wetland using the 2004 Department of Ecology rating system due to its specific scores for habitat, water quality functions, and hydrologic functions. This wetland is dominated by relativety few species. Species observed within the wetland include: reed canarygrass, Nootka rose, and hard hack. Scattered Oregon ash are located along the wetland boundary,but are not generally rooted within the wetland area. Saturation and/or inundation were not directly observed during September field work. This appears to be an ephemeral system, that retains soil inundation and saturation for short amounts of time during periods of heavy rainfall. Soils in the area of wetland #L are mapped as McKenna gravelly silt loam. Soils within the wetland are somewhat consistent with the McKenna series description. Soils observed in the wetland are mainly 10YR 2/I gravelly loam with redoximorphic features in the uPPer L8 inches. This wetland likely provides functions related to water quality, and floodwater storage. The wetland functions as a groundwater recharge area, and provides sediment/toxicant retention, and provides wildlife habitat, mainly for passerine bird species. Under the City of Yelm Critical Areas Ordinance, Chapter 1'4.08, Yelm Community Schools Proposed Transportation Center l(etland Analysis Report September 2009 this wetland would require a 80 foot buffer from the delineated edge of the wetland, based on the specific rating scores of the wetland. Wetland 2 Palustrine Scrub Shrub Broadleaf Deciduous Seasonally Flooded (PSS1E) --Category III Wetland #2is a depressional area located north of Wetland #L, just south of Yelm Creek, within the historic floodplain of Yelm Creek. The wetland is similar to Wetland #L, in that it is an isolated, closed depressional system, that has been impacted (either enlarged or reduced in size) by past earthwork in the floodplain area. It may have historically been connected to Yelm Creek, which appears to have been ditched through this stretch. Based on the delineation and survey, this wetland is 3,014 square feet in size. The wetland was rated as a Category III wetland using the 2004 Department of Ecology rating system due to its specific scores for habitat, water quality functions, and hydrologic functions. This wetland is also dominated by relatively few species. Species observed within the wetland include: Western crabapple, hawthorne, black cottonwood, Oregon ash, and reed canarygrass. Saturation and/or inundation were not directly observed during September field work. This appears to be an ephemeral system, that retains soil inundation and saturation for short amounts of time during periods of heavy rainfall. Soils in the area of wetland #2 are mapped as McKenna gravelly silt loam. Soils within the wetland are somewhat consistent with the McKenna series description. Soils observed in the wetland are mainly 10YR 2/L gravelly loam with redoximorphic features in the upper 1"8 inches. This wetland likely provides functions related to water quality, and floodwater storage. The wetland functions as a groundwater recharge area, and provides sediment/toxicant retention, and provides wildlife habitat, mainly for passerine bird species. Under the City of Yelm Critical Areas Ordinance, Chapter 1'4.08, this wetland would require a 80 foot buffer from the delineated edge of the wetland, based on the specific rating scores of the wetland. YELM CREEK Yelm Creek, which flows from east to west along the northern edge of the site, is a regulated feature under the City of Yelm's Critical Areas Ordinance ,1'4.08.140. 14.08.140 (D2b) designates Yelm Creek as a Type 5 stream, requiring a 150 foot Yelm Community Schools Proposed Transportation Center lletland Analysis Report September 2009 9 riparian area buffer from the Ordinary High Water mark (OHWM) of the creek. The creek and its associated buffer are shown on the project site plan. IMPACTS Under the current design of the project, there will be no impacts to the onsite wetlands, Yelm Creek, or any wetland or stream buffers as a result of the project. The proposed project will include the development of additional parking the southern portion of the site, as well as the demolition of one of the existing buildings in the southern half of the site. Should the project design be modified, impacts will need to be re-evaluated. MITIGATION Mitigation measures should include, but not be limited to, the following: 1. Avoiding the impact altogether by not taking a certain action or part of an action; 2. Minimizing impacts by limiting the degree or magnitude of the action and its implementation, by using appropriate technology, ot by taking affirmative steps to avoid or reduce impacts; 3. Rectifying the impact by repairing, rehabilitating, or restoring the affected environment; 4. Reducing or eliminating the impact over time by preservation and maintenance operations during the life of the action; 5. Compensating for the impact by replacing, enhancing, or providing substitute resources or environments; 6. Monitoring the impact and taking appropriate corrective measures. Various replacement ratios can be used depending on the quality and diversity of the impacted wetlands (see Appendix #5). This project has followed the mitigation sequence by avoiding all impacts to wetlands and their associated buffers. Yelm Community Schools Proposed Transportation Center September 2009 lletlqnd Analys is Report l0 REFERENCES Cowardin,L.M,, V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of wetlands and deepwater habitats of the United States. U.S. Fish and Wildlife Service. FWS/OBS 79/3t. Environmental Laboratory. 1987. "Corps of Engineers Wetlands Delineation Manual," Technical Report Y-87-1,. U.S. Army Engineer Waterways Experiment Station, Vicksburg, MS. Franklin, J.T. and C.T. Dyrness.1973. Natural vegetation of Oregon and Washington. USDA, Forest Service, Gen. Tech.Rep.PNW-8. Reed, P.8., Jr. 1988. National list of plant species that occur in wetlands: Northwest (Region 9). U.S.D.I. Fish and Wildlife Service Biological Report 88 (26.9). 8e pp. USDA Soil Conservation Service. 1990. Soil Survey of Thurston County Area, Washington. USDA Soil Conservation Service. t991' Hydric Soils of the United States. Misc. Publication#L49'1.. Washington State Department of Ecology. 1993. Washington State Wetlands Rating System for Western Washington. Publication #93-74. 61pp. Washington State Department of Ecolo gy. 1997. Washington State Wetlands Identifcation and Delineation Manual. Publicati on #96-94. Yelm Community Schools Proposed Transportation Center September 2009 lletland Analysis Report 1l Appendix 1. Wetland Rating Forms. Yelm Community Schools Proposed Transportation Center September 2009 lletland Analysis Report Wetland name or nurb", 4 Name of wetland Rated by SEC: SUMMARY OF RATING Category based on FLTNCTIONS provided by wetland WETLAND RATING FORM -WESTERN WASHINGTON Version 2 -Updated July 2006 to increase accuracy and reproducibility among users :land (if known): \{P.U.a C,¡¡r*r.¿. ge¿rr¡ouç tr/r-} Daß ofsite visit: Wl^oUlatf &u nçøu-\ Trained by Ecology t v"r/o-Date of trainingo4 -o8â r_ il mK rv_ Categoryl=Score>=70 Category lI = Score 5l-69 Category III = Score 30-50 Category IV = Score < 30 TWNSHP: -RNGE: -Is S/T/R in Appendix D? Yes-No-Map of wetland unit: Figure -Estimated s¡ze -Q-¡2 l1-t4 4s Score for Water QualitY Functions Score for Hydrologic Functions Score for Habitat Functions TOTAL score for Functions Category based on SPECIAL CHARÄCTERISTICS of wetland II Does not Apply Vt Final Categor] (choose the "highest" category from above) Summary of basic information about the wetland unit Wetland Rating Form -western Washington version 2 Wetlard,Uuif has Speclal C.harecferisfics W alrq FçM Class used foi Rafins Estuarine Denressional r{-Natural Heritage Wetland Riverine !¿ Boe Lake-frinqe Mature Forest Slope Old Growth Forest Flats Coastal Lagoon Freshwater Tidal Interdunal None of the above Check if unit has multiple HGM classes Þresent * August 2004 Wetland name or number 'L Does the wetland unit being rated meet any of the criteria below? If you answer YES to any of the questions below you will need to protect the wetland according to the regulations regarding the special characteristics found in the wetland. The hydrogeomorphic classifîcation groups wetlands into those that function in similar ways. This simplifies ihe queitions needed to answer how well the wetland functions. The Hydrogeomorphic Class of a wetlànd can be determined using the key below. See p. 24 for more detailed instructions on classif,ing wetlands. Wetland Rating Form -western Washingon version 2 Càeck l¿st'for Wcttands Shat May N$ Addìtiona! P, roteotio. n lín addition to tüe Drotecf¡o-û re,Gomüû.€-trded,forits qeÚçÆ1ry)-YDS $[o SPl. Ilas the wetland unit been documented as a habitatþr any Federally listed Threatened or Endangered anímøl or plant species (T/E species)? For the purposes of this rating System, "documented" means the wetland is on the aoprooriate state or federal database. { SP2. Has the wetland unit been documented as habitatþr any State listed Threatened or Endangered anímal species? For the purposes of this rating system, "documented" means the wetland is on appropriate state database. Note: Wetlands with State listed plant species are catesorizedas Catesorv I NaturalHeritage Wetlands (see p. l9 of data fonÐ. the Y SP3. Does the wetland unit contain individuals of Priority species listed by the WDFWfor the state? X SP4. Does the wetland unit have a local sígnificance in addition to its functions? For example, the wetland has been identified in the Shoreline Master Program, the Critical Areas Ordinance, or in a local management plan as having special significance. (. August 2004 Wetland name ornumb ", $ Total for D I Wetland Rating Form -westem Washingfon version 2 Add the points in the boxes above la.-\tt ---I J9--(see p, 44) multiplier 2 {P¡l¡¡ I 'sçcirç Èói--x) n t. poes ttr" *ettand unÍt have the 4,¡!g¡!þ!to improve water qualify? (see p,38) O t.t ChJracteristics of surface water flows out of the wetland: Unitisadepressionwithnosurfacewaterleavingit(nooutl t)@Unit has an intermittently flowing, OR highly constricted permanently flowing outlet points = 2 Unit has an unconstricteá, or slightly constricted, surface outlel Qtermanentlyflowing) points = I -Unit is a "flat" depression (Q. ion key), or in the Flats class, with permanent surface outflow and no obvious natuial outlet and/or outlet is a man-made ditch points : I (If ditch is nol permanentlyflowing tt'eat unil as "inlermittentlyflowing") Provide Dhoto or re_ ffiihe surface (or duff layer) is clay or organic (use NRCS definitions) YES NO (emergent, shrub, and/or forest Cowardin class) Wetland has persistent, ungrazed, vegetation > = 95o/o of area ooints = 5 üïffiffiä'iät,ung,u,.d,vegetation>=1l2ofarea@Wetland has persistent, ungfazed vegetation > = l/10 of area points = I Wetland has þersistent, ungrazed vegetation <1/10 of area points:0 Cowardin veqetation classes Dl.4 Characteristics of seasonal ponding or inundation. This ß the area of the wetland unít that is pondedfor at least 2 months, but dries out sometime duringih, y"or. Do not count the area that is permanenlly ponded' Estimale area as the average condition 5 out of 10 yrs. Area seasonally ponded is> %total area of wetland Area seasonally ponded is > V¿ total area of wetland Area seasonally ponded is <t/q total area of wetland points: 4 points = 2 points = 0 b Z. Ooã. tne wetland unit have the p¡pqlunlq to improve water quality? Answer yES if you know or Uetieve ttrere¿re pollutants in groundwater or surface water coming into theïetland that would otherwise reduce water quality jn streams, lakes or grounõwater dowñgradient from the wetland. Note which of the þllowing conditíons 'proiia, the sourcel of pollutants. A unit may have pollutants comingfrom several -sottrces, bul any single source would qualify as opportunity' -Grazing in the wetland or within 150 ft -Untreated stormwater discharges to wetland -Tilled fields or orchards within 150 ft of wetland -A stream or culvert discharges into wetland that drains developed areas, residential areas, farmed fields, roads, or clear'cut logging FResidential, urban areas, golf courses are within 150 ft of wetland -'Wetland is fed by groundwater high in phosphorus or nitrogen NO multiplier is 1 TOTAL -Water QualitY Functions Multiply the score from Dl bY D2 Add score to løble on P. I August 2004 Wetland name or number 4, Total for D 3 Wetland Rating Form -westem Washingfon version 2 '3 Add the points in the boxes above --r-2-_ ----(see p. 49) multiplier L Depressional and Flats \iletlands nybnOlOGIC FUNICTIONS -Indicators that the wetland unit functions to Points (o¡rly I score per box) D 3. Does the weiUnd unii have the notential to reduce flooding and erosion? (see p.46) D 3. t Characteristics of surface water flows out of the wetland unit Unit is a depression with no surface water leaving it (no outlet) (-q--a>!-Ð Unit has an intermittently flowing, OR highly constricted permanently flowing outlet poÌt5-= 2 Unit is a,,flat" depressión (Q. 7 ón key), or in the Flats class, with permanent surface outflow and no obvious naturat outlei ànd/or ouilet is a man-made ditch points = I (If ditch is not permanently/towing treat unit as "inlermitlentlyJlowing") D 3.2 Depth of storage during wet periods Estimate the height of pondtng above the bottom of the outlet. For units with no outleî measure from the surface of permanenl water or deepest part (if lry)' Marks oiponding are 3 ft or more above the surface or bottom of outlet points = 7 The wetland is ai'headwater" wetland" points = 5 Marks of ponding between 2 ftto <3 ft from surface or bottom of outlet <::@sÞ Marks are at leasi 0.5 ft to < 2 ft from surface or bottom of outlet points = 3 Unit is flat (yes to Q. 2 or Q. 7 on key) but has small depressions on the surface that trap water Points = I Marks of oondine less than 0'5 ft points = 0 D 3.3 Contribution of wetland unit to storage in the watershed Estimqte the ratio of the area of upstream basin contributing surface water to lhe wetland to the area of the wetland unit itself. The area of the basin is less than 10 times the area of unit The area of the basin is I 0 to I 00 times the area of the unit The area of the basin is more than 100 times the area of the unit þoints = 0 Entire unit is in the FLATS class YES multiplier is 2 lier is I D ¿5o"s the wettand unit have the glBg¡¡gÉ to reduce flooding and erosion? Answer YES if the unit is in a location in the watershed where the flood storage, or reduction in water velocity, it provides helps protect downstream property and aquatic resources from flooding or exóessive and/or erosive flows. Answer NO if the water coming into the wetlanã is controlled by a structure such as flood gate, tide gate, flap valve,îeservoir etc. OR you estimate that more than 90Yo of the water in the wetland is from groundwater in areas where damaging gloundwater flooding does not occur' Note wh¡ch of the þltowing indícators of opportunity apply' -Wetland is in a headwater of a river or stream that has flooding problems -Wetland drains to a river or stream that has flooding problems -Wetland has no outlet and impounds surface runoffwater that might otherwise flow into a river or stream that has flooding problems Multiply the score from D 3 bY D 4 Add score to table on P. I August 2004 Wetland name or number I lhesç gueslíons opply lo ut¿tlands,of ø ltr',HGM classes. t¡AÐJr4.t ru-xcÏIöÑß -tndioators thet unit fimctiqns ro provi'¡le i$portani h4üitet H 1. Does the wetland unit have the P!g!!g! to provide habitat for many species? Points (orfy 1 score porbox) 1.1 Vegetation structure (see p,72) Cttr"tt tn, typrt oJrigeraúon'classes present (as defined by Cowardin)-Size threshold þr each class is % acre or more than l0% of the area if unir is smaller îhan 2.5 acres' Aouatic bed XEt.tg"nt plants -Scrub/shrub (areas where shrubs have >300/o cover) -Forested (areas where trees have>3jo/o cover) If the unit has a þresÍed class check if: _The forested class has 3 out of 5 strata (canopy, sub-canopy, shrubs, herbaceous, moss/ground-cover) that each cover 20Yo within the forested polygon Add the number of vegelation structures that qualify. If you have: 4 structures or more 3 structures points = 4 points = 2 2 structures Bgiffs=J-) I structure (Points =ß/Map of Cowardin vegetation classes Figure _ {? points = 3 points = 2 point = I points = 0 1.2. Hvdroperiods (see p. 73) Checkihu typtt ofwater regimes (hydroperiods) present wilhin the wetland. The water regime has ii core, more lhan 10% of the wetland or y4 acre to coutlt. (see text þr de s cr ipt i ons of hydroperi od s) Permanently flooded or inundated -Lake-frìnge wetland = 2 Points Freshwater tÍdal wetlønd = 2 points 4 or more types Present Þ,< Seasonally flooded or inundated 3 types present Occasionally flooded or inundate¿ ilry+es+¡esplt -saturated onlY (-l tYP" Pr:Y Permanently flowing stream or river in, or adjacent to, thõEtlffi--Seasonally flowing stream in, or adjacent to, the wetland Map of hydroperiods Figure _ a (dffirenr patuhes Canadian Thistle points = 2 points = I points = 0 H 1.3. Richness of Plant Species (see p.75) Count the number of plant species in the wetland that cover at least l0 ff. of the same species can be combined to meet the size threshold) You do not have to name the sPecies. Do not include Eurasian Mitfoit, reed canarygrass, purple loosestrife, Ifyou counted: List species below ifyouwanl to: > 19 species 5 -19 species -ã-+\ 6!-9Þec¡€s C) Total for page Õ 'Wetland Rating Form -westem Washingfon 13 version 2 August 2004 Wetland name or number 11-H 1. TOTAL Score -potential for providing habitat Add the scores H1.1. H1.2, H1.3, H1.4, HI.é z__ ?__l Wetland Rating Form -western Washington version 2 l4 1.4. Interspersion of habitats ls¿e p. 76) Decidr fror th. áiugru*s below whether interspersion between Cowardin vegetation classes (described in H t . t;, or the classes and unvegetated areas (can include open water or mudflats) is high, medium, low, or none. [riparian braided channels] NOTE: If you have four or more classes or three vegetation classes and open water the ratinq is always "high". Use H 1.5. Special Habitat Features: lsee p, 77) Check the habnat ¡"otrr"s that àre presenl in the wetland. The nuntber of checks is the number of points you put into the nexl column. *Large,¿o*ne¿, woody debris within the wetland (>4in. diameter and 6 ft long)' )x-Standing snags (diameter at the bottom > 4 inches) in the wetland Undercut banks are present for at least 6.6 ft (2m) and/or overhanging vegetafion extends at least 3.3 ft (lm) ouã, u stream (or ditch) in, or contiguous with the unit, for at least 33 ft (10m) _Sìable'steep banks of fine material that might be used by beaver or muskrat for denning -(>36degróe slope) OR signs ofrecent beaver activity are present (cul shrubs or trees that have not yeî turned greY/brown) _At least t/o acre of thiñ-siemmed persistent vegetation or woody branches-are pt"-s_e.nl in areas that are permanently o6earonaily inundated.(s tructures þr eggJaying by a.mphibians) _ Invasive plants covãr less than2liP/oof the wetland area in each stratum of plants NOTE: The 20% stated in early printings of the manual on page 78 is an error' Comments August 2004 Wetland name or number ç H 2. Does the wetland unit have the opportunity to provide habitat for many species? H 2.1 Buffers (see p. 80) Choose iie desìcription that best represents condition of bufer ofwetland unil. The highest scoring criterion that appTies to the wetland is to be used in the rating. See text þr definition of "undisturbed. " -100 m (330ft) of relatively undisturbed vegetated areas, rocky areas, oropen laPr >95o/o of circumference. No structures are within the undisturbed part of buffer. (relatively undisturbed also means no-grazing, no landscaping, no daily human use) Points = 5 -100 m (330 ft) of relatively undisturbed vegetated areas, rocþ areas, or operyltgr > 5ooá circumference. a@) -50 m (170ft) of relatively undisturbed vegetated areas, rocky areas, or opeìuaref:95% circumference. Points = 4 -1 00 m (330ft) of relatively undisturbed vegetated areas, rocþ areas, or openïvafer > 25Vo circumference, . Points = 3 -50 m (170ft) ofrelatively undisturbed vegetated areas, rocky areas, or open water for > 50olo circumference' Points = 3 buffer does not meet any of the criteria above -No paved areas (except paved trails) or buildings within 25 m (80ft) of wetland > 95yo circumference. Lighitomoderate grazing, or lawns are OK. Points = 2 -No paved areas or buildings within 50m of wetland for >500/o circumference. Light to moderate gazing,or lawns are OK. Points = 2 -Heavy grazingin buffer. Points = 1 -Vegetated buifers are <2m wide (6.6ft) for more than 95o/o of the circumference (e.g. tilled fieiãs, paving, basalt bedrock extend to edge of wetland Points = 0' -Buffer does not meet any of the criteria above. Points = 1 H 2.2 Conidors and Connections (see p. 81) H 2.2.1Is the wetland part of a relatively undisturbed and unbroken vegetated corridor (either riparian or upland¡ that is at least I 50 ft wide, has at least 30% cover of shrubs, forest or nativgundisturbed prárie, that connects to estuaries, other wetlands or undisturbed uplands that are at least 250 acres in size? (dams in riparian corridors, heavily used grawl roads, paved roads, are considered breaks ín the corridor)rX YES = 4 points (go to H 2.3) ({o =40) H2'2'2, H 2.2.Z ls the wetland^ part of alelatively undisturbed and u en vegetated corridor (either riparian or upland) that is at least 50ft wide, has at least 30o/o cover ofshrubs or forest, und .o*".ts to esiua¡ies, other wetlands or undisturbed uplands that are at least 25 acres in size? OR a Lake-fringe wetland, if it does not have an undisturbed corridor as in the question above? YES = 2 points (go to H 2.3) H2.2.3Is the wetland: within 5 mi (8km) of a brackish or salt water estuary OR within 3 mi of a large field or pasture (>40 acres) OR within 1 mi of l5 Total for page I Wetland Rating Form -western Washingfon version 2 August 2004 Vy'etland name or number J' Wetland Rating Form -westem Washington 16 August 2004 version 2 H 2.3 Near or adjacent to other prioritv habitats listed by WDFW (see p. 82) Which of the following priority habitats are within 330ft (100m) of the wetland unil? NOTE: the connections do noî have to be relatively undisturbed. ^ These are DFW defìnitions. Check wilh your local DFW biologisl if there are any questions. lXRip"r¡an: The ärea adjacent to aquatic systems with flowing water that contains elements of -both àquatic and terrestrial ecosystems which mutually influence each other. Aspen Stands: Pure or mixed stands of aspen greater than 0.8 ha (2 acres). -Cliffs: Greater than7.6 m (25 ft) high and occurring below 5000 ft. _OtA-growth forests: (Old-growth west of Cascade crest) Stands of at least 2 tree species, -forñring a multi-layered canopy with occasional small openings; with at least 20 trees/ha (8 trees/acre) > 8l cm (32 in) dbh or> 200 years ofage. Mature forests: Stands with average diameters exceeding 53 cm (21 in) dbh; crov/n cover may be less that t00o/o: crown cover may be less that 100!/.o; decay, decadence, numbers of snags, and quantity of large downed material is generally less than that found in oldgrowth; 80 -200 years old west of the Cascade crest. _Piairies: Relativeþ undisturbed areas (as indicated by dominance of native plants) where grasses and/or forbs form the natural climax plant community. -Tatus: Homogenous areas of rock rubble ranging in average size 0.15 -2'0 m (0'5 -6.5 ft)' composed oibasalt, andesite, and/or sedimentary rock, including riprap slides and mine tailings. May be associated with cliffs. _Caves:1 naturally occurring cavity, recess, void, or system of interconnected passages Oregon white Oak: Woodlands Stands of pure oak or oak/conifer associations where canopy coverage ofthe oak component ofthe stand is25Yo. _UrbanÑatural ôpen Space: A priority species resides within or is adjacent to the open space and uses iifor breeding and/or regular feèding; and/or the open space fi'rnctions as a conidor connecting other p'ioríty habitats, especially those that would otherwise be isolated; and/or thJopen space is an isolated remnant ofnatural habitat larger than 4 ha (10 acres) and is sunounded by urban development. EstuaryÆstuary-like: Deepwater tidal habitats and adjacent tidal wetlands, usually semi--encloied by land but with open, partly obstructed or sporadic access to the open ocean, and in which oôean water is at làast occasionally diluted by freshwater runoff from the land. The salinity may be periodically increased above that of the open ocean by evaporation. Along sorne low-energy coastlines there is appreciable dilution of sea water. Estuarine habitat extends upstream and landward to where ocean-derived salts measure less than 0.5ppt. during thã period of average annual low flow. Includes both estuaries and lagoons. fvfaiine/Estuãrine Shorelines: Shorelines include the intertidal and subtidal zones of beaches, and may also include the backshore and adjacent components of the the terrestrial landscape 1e.g., óliffs, snags, mature trees, dunes, meadows) that are important to shoreline associated fish and wildlife and that contribute to shoreline function (e.g., sand/rock/log recruitment, nutrient contribution, erosion control). If wetland has 3 or more priority habitats = 4 points If wetland has 2 priority habitats = 3 points If wetland has 1 priority habitat = 1 point No habitats = 0 points Note: Alt vegetated wetlands are by definitíon a priority habitat but are not included in this list. are addressed in 2.4 4. Wetland name or number L the one description of the landscape around the wetland that best lìts) (see p. 84) There are at least 3 other wetlands within Yzmile, and the connections between them are relatively undisturbed (light grazing belween wetlands OK, as is lake shore with some boating, but connections should NOT be bisected by paved roads, fìll. fields. or other developmenr. ''-"o ù¡rvs¡s The wetland is Lake-fringe on a lake with little disturbance and there are 3 other hî.;h# wetlands within %milé Points = 5 There are at least 3 other wetlands within Yzmile,BUT the connections between them are The wetland is Lake-fringe on a lake with disturbance and there are 3 other lake-fringe wetland within Yzmile Points = 3 There is at least I wetland within Yz mile. points = 2 There are no wetlands within t/zmile. H 2. TOTAL Score -opportunity for providing habitat I to Add the scores .from H2, I 'H2. -'I --TOTAL for H 1 from page 14 Total Score for Habitat Functions -add the points for H 1 ,H 2 and record the result on Wetland Rating Form -western Washington version 2 t7 August 2004 Wetland name or nutbr, { please determine íf the wetland meets the attríbutes descríbed below and círcle the øppropríate answers and Cøtegory. Wetland Rating Form -westem Washington version 2 l8 Wetland Type Check offany øiteria thar apply to the wetland. nnnrnnrínle aritcrìa are met. Circle the CategorYwhen the Category SC 1.0 Estuarine wetlands (see p, 86) Does the wetland unit meet the following criteria for Estuarine wetlands? -The dominant water regime is tidal, -Vegetated, and -With a salinity gteatet than 0.5 ppt. \ r YES: Go to SC 1.1 NO F YF.S = Catesorv I NO go to SC 1.2 SC l.l Is the wetland unit within a National Wildlife Refuge, National Park, National Estuary Reserve, Natural Area Preserve, State Park or Educational, Environmental, or Scientific Reserve designated under WAC 332'30-151? Cat.I SC 1.2 Is the wetland unit at least I aøe in size and meets at least ¡vo of the following three conditions? YES : Category I NO = Category II -The wetland is relatively undisturbed (has no diking, ditching, filling, cultivation, grazing,and has less than l0olo cover of non'native plant species. If the non-n ative Spartina spp. are the only species that cover more than l0% of the wetland, then tñe wetland should be given a dual rating (I/II). The area of Spartina would be rated a Category II while the relativòly undisturbed upper marsh with native speoies would be a Category I. Do not, however, exclude the area of Spartina in determining the size threshold of I acre. -At least3/aof the landward edge of the wetland has a 100 ft buffer of shrub, forest, or un-grazed or un-mowed grassland' -The wetland has at least 2 of the following features: tidal channels, depressions with open water, or contiguous freshwater wetlands. Cat.I Cat.II Dual rating VII August 2004 Wetland name or nurb", A Wetland Rating Form -western Washington 19 August 2004 version 2 SC 2.0 Natural Heritage Wetlands (see p, 87) Natural Heritage wetlands have been identifîed by the Washinglon Natural Heritage Program/DNR as either high quality undisturbed wetlands or wetlands that support state Threatened, Endangered, or Sensitive plant species. SC 2.1 Is the wetland unit being rated in a Section/TownshiplRange that contains a Natural Heritage wetland? (this question is used to screen out most sites beþre you need to contact WNHP/DNR) S/T/R information from Appendix D _ or accessed from WNHP/DNR web site -YES_-contact WNHP/DNR (see p. 79) and go to SC 2.2 NOK SC 2.2 Has DNR identified the wetland as a high quality undisturbed wetland or as or as a site with state threatened or endangered plant species? YES = Category I NO X_not a Heritage Wetland Cat.I SC 3.0 Bogs (see p, 87) Does the wetland unit (or any part of the unit) meet both the criteria for soils and vegetation in bogs? rJse the l<ey below to identify íf the wetland is a bog. If you ønswer yes you wíIl stíll need to rate the wetland based on íls functíons, 1. Does the unit have organic soil horizons (i.e. layers of organic soil), either peats or mucks, that compose l6 inches or more of the first 32 inches of the soil profrle? (See Appendix BrforÀfield key to identify organic soils)? Yes -gotoQ.3 (ygotoQ.2 2. Does the unit have organic soils, either peats or mucks that are less than l6 inches deep over bedrock, or an impermeable hardpan such as clay or volcanic ash, or that are floating on a,!a$or pond? Yes -go to Q. 3 qt Is not a bog for purpose of rating 3. Does the unit have more thanT0o/o cover of mosses at ground level, AND other plants, if present, consist of the "bog" species listed in Table 3 as a significant component of the vegetation (more than 30% of the total shrub and herbaceous cover consists ofspecies in Table 3)? Yes -Is a bog for purpose of rating No -go to Q. 4 NOTE: If you are uncertain about the extent of mosses in the understory you may substitute that criterion by measuring the pH of the water that seeps into a hole dug at least 16" deep. If the pH is less than 5.0 and the "bog" plant species in Table 3 are present, the wetland is a bog. L Is the unit forested (> 30% cover) with sitka spruce, subalpine fir, westem red cedar, western hemlock, lodgepole pine, quaking aspen, Englemann's spruce, or westem white pine, WITH any of the species (or combination of species) on the bog species plant list in Table 3 as a significant component ofthe ground cover (> 30% coverage ofthe total shrub/herbaceous cover)? 2. YES = Category I No-Is not a bog for purpose of rating Cat.I Wetland name or number -LWetland Rating Form -western Washinglon 26 August 2004 version 2 SC 4.0 Forested Wetlands (see p.90) Does the wetland unit have at least 1 acre of forest that meet one of these criteria for the Department of Fish and Wildlife's forests as priority habitats? If you answer yes youwill still need to rate the wetland based on itsfunctions. -Old-growth forests: (west of Cascade crest) Stands of at least two tree species, formi-ng a multi-layered canopy with occasional small openings; with at least 8 trees/aðre (20 trees/hectare) that are at least 200 years ofage OR have a diameter at breast height (dbh) of 32 inches (81 cm) or more' NOTE: The criterion for dbh is based on measurements for upland forests. Two-hundred year old trees in wetlands will often have a smaller dbh because their growth rates are often slower. The DFW criterion is and rrOR" so old-growth forests do not necessarily have to have trees of this diameter. -Mature forests: (west of the Cascade Crest) Stands where the largest trees are 80 -200 years old OR have average diameters (dbh) exceeding2l inches (53cm); cro*n cover may be less that 100%; decay, decadence, numbers of inags,'and quantity of large downed material is generally less than that found in old-growth. YES = Category I NO -pnot a forested wetland with special characteristics Cat.I SC 5.0 Wetlands in Coastal Lagoons (see p,9I) Does the wetland meet all of the following criteria of a wetland in a coastal lagoon? -The wetland lies in a depression adjacent to marine waters that is wholly or partially separated from marine waters by sandbanks, gravel banks, shingle, or, less frequentlY, rocks -The lagoon in which the wetland is located contains surface v/ater that is saline òr brackish (> 0.5 ppt) during most of the year in at least a portion of the lagoon (needs to be measureQnear the bottom) YES = Go to SC 5.1 No)Snot a wetland in a coastal lagoon sc 5.1 Does the wetland meets all of the following three conditions? -The wetland is relatively undisturbed (has no diking, ditching, filling, cultivation, grazing), and has less than 20o/o cover of invasive plant species (see list of invasive species on p. 74). -At leasts/a of the landward edge of the wetland has a 100 ft buffer of shrub, forest, or un-grazed or un-mowed grassland' -The wetland is larger than l/10 acre (4350 square feet) IES = Category I NO = Category II Cat.I Cat.II ffetland name or n ^b", L SC 6.0 Interdunal Wetlands (see p. 93) Is the wetland unit west of the 1889 line (also called the Western Boundary of Upland Ownership or WBUO)? YES -go to sc 6.1 No )¿ not an interdunal wetland for rating If you ønsh)er yes you wíll stìtl need to rate the wetland based on íts functíons, In practical terms that means the following geographic areas: . Long Beach Peninsula-lands west of SR 103 o Grayland-Westport-lands west of SR 105 o Ocean Shores-Copalis-Iands west of SR I l5 and SR 109 SC 6.1 Is the wetland one acre or larger, or is it in a mosaic of wetlands that is once acre or larger? YES = Category II SC 6.2 Is the unit between 0.1 and I acre, or between 0.1 and I acre? YES = Category III NO -go to SC 6.2 is it in a mosaic of wetlands that is Cat.II Cat.III 'and,recordon C-atsgor¡, sf wetland basd oo Sp* choose tlæ "hig,*æst" røing ifwetlnndfalls ittø sarerol aatggoríes, p. 1,. If vou answered'No for all types e¡ter'î{ot aoplicable,? on.o:l ùh Wetland Rating Form -western Washingto¡ 21 version 2 August 2004 WETLAND RATING FORM _ WESTERN WASTIINGTON Version 2 -tJpdated July 2006 to increase accuracy and reproducibility among users Name of wetland (if known): \tluF4 /^,.,u4 Çc,t\oo¡ q \¿lL -Da /i) .^.. -.. õ -! --,r t,,-r--t^--,o ,.r^^rA lour"of site visit:!@6 ûb o\ Rared Uy Q¡egev-Trained by Ecology? Yes l/No-Date of training 04 -¿r å SEC: TWNSHP: RNGE: Is S/TIR in Appendix D? Yes-No-Map of wetland unit: Figure Estimated size SUMMARY OF RATING Category based on FUNCTIONS provided by wetland T II IIIK IV Wetland name or number Categoryl=Score>=70 Category II = Score 5l-69 Category III = Score 30-50 Category IV = Score < 30 Score for Water QualitY Functions Score for Hydrologic Functions Score for Habit¿t Functions TOTAL score for Functions 2Å> t2 14 Au' Category based on SPECIAL CHARACTERISTICS of wetland I-II-Does not APpIY-,þ Final Categor] (choose the "highest" category from above) Summary of basic information about the wetland unÍt Wetland Rating Form -western Washingfon version 2 Wofland U,,pit has SPçial Characteristics ,wetlenil 'Iil-GM C,lass', . ,.usd foiRsting-Estuarine Denressional V Natural Heritage Wetland Riverine )< Bos Lake-frinse Mature Forest Slope Old Growth Forest Flats Coastal Lasoon Freshwater Tidal Interdunal None of the above Check if unit has multiPle HGM classes present )< August 2004 Wetland name or nu b", 7 Does the wetland unit being rated meet any of the criteria below? If you answer YES to anyìf the questions below you will need to protect the wetland acðording to the regulations regarding the special characteristics found in the wetland. To complete the next part qf the data sheet youwíll need to determíne the Hydrogeomorphic Class of the wetland being rated' The hydrogeomorphic classification groups wetlands into those that function in similar ways. This simplífies ih. quætions needed to answeihow well the wetland functions. The Hydrogeomorphic Class of a wetland can be determined using the key below. See p. 24 lor more detailed instructions on classiff ing wetlands. IVetland Rating Form -western Washington 2 August 2004 version 2 Chectr LÍst for Wetlands lha{ l}Iay lNeed Addn'Íional Proteçüon (ín additioin to the profßction recommende@Y,ß.s Nio Spt nas tne wetto"¿ ""¡t øeen documented as a habitat þr any Federally listed Threatened or Endangered anímal or plant species (T/E species)? For the purposes of this rating system, "documented" means the wetland is on the aoorooriate state or federal dat¿base. K SpZ. n^ tne retta"d unit been documented as habitat þr any State listed Threatened or Endangered anímal species? For the purposes of this rating system, "documented" means the wetland is on the appropriate state database. Note: Wetlands with State listed plant species are catesorizedas Catesorv I NaturalHeritage Wetlands (see p. 19 of dqta&rm}-X SP3. Does the wetland unit contaín indíviduals of Priority species listed by the lltDFWþr the state? >( SP4. Does the wetland unit have a local significance in additíon to its functions? For example, the wetland has been identified in the Shoreline Master Program, the Critical Areas Ordinance, or in a local management plan as having special significance ,<_ Wetland name or number L¿' Total for D I 'Wetland Rating Form -western Washinglon version 2 ure _ Add the points in the boxes above J-q--(see p. 44) multiplier Õ¿---Depressional a¡d Flats Wedan¡ls r9T$ -*mpilrtu+l,my FUNCTIONS . krdipators,trhat the wetland unitû¡nctions to $lilot-*" M unit have the PÍgliqlto improve water quality? D t1..r1c nCahraarcaæcterirsistticicss of surftace water lfllows out oorf trhnee wweetlaunadn: c¡: Unit is a depression with no surface water leaving it (no outlet) pornts t^ "\ ' Unit has an intermittently flowing, OR highly constricted permanently flowing outlet points = 2 Unit has an unconstricteå, or slightly conJtricted, surface outlet Qtermanentlyflowing) points = 1 Unit is a,,f7at' depression (Q. ion'key), or in the Flats class, with permanent surface outflow and no obvious natuial outlet and/or outiet is a man-made ditch points = I (If ditch is nol permanenily/towingtreal unit as "intermittentlyfowing ) Provide Photo or laYer) is claY or organic (use NRCS definitions) YES YES NO @istent vegetation (emergent, shrub, and/or forest Cowat Wetland has persistent, ungrazed, vegetation > = 95%o of area pgtnl! =J Wetland has persistenf , ungrazed, vegetation > = 112 of area Wetland has persistent, ungrazed vegetation > = l/10 of area Wetland has persistent, ungrazed vegetation <1/10 of area points = 0 Dl.4 Characteristics of seasonal ponding or inundation. This is the area of the wetland unit that is ponded þr at least 2 months, but dries oul sometime duringih, y"or. Do not count the area thal is permanently ponded. Estimate area as the average condition 5 out of 10 yrs. Area seasonally ponded is> Yztotal area of wetland Area seasonally ponded is> Vo total area of wetland Area seasonally ponded is < t/c total area of wetland points = 0 coming into theïetland that would otherwise reduce water quality jn streams' lakes or grouní*ut.t dowñgradient from the wetland' Note which of the following conditions "pr;;;;, ih,, ,ourc"l o¡pollutants. A unit may have pollutants comingfrom several -soltrces, bul any single source would qualify as opportunity' -Grazing in the wetland or within 150 ft -Unheated stormwater discharges to wetland -Tilled fìelds or orchards within 150 ft of wetland f e ,n.ur or culvert discharges into wetland that drains developed areas' residential areas, farmed fields, roads, or clear-cut logging -Residential, urban areas, golf courses are within 150 ft of wetland -V/etland is fed by groundwater high in phosphorus or nitrogen -Other YES multiPlier is 2 NO multiplier is I O Z" no.t the wetland unit have the qp@giE, to improve water quality? Answer yES if you know or Uetieve tttere¿re pollutants in groundwater or surface water TOTAL -Water QualitY Functions Multiply the score from Dl bY D2 Add score to table on P. I August 2004 Wetland name or number L Total for D 3 Wetland Rating Form -western Washinglon version 2 Add the points in the boxes above t'2_ I --------(see p. 49) multiplier L Depressional and Flats lVetlands ffybnOlOGIC FUNCTIONS -Indiçators that the wetland unit functions to Poinfs (odly I score per box) ethe pg!g¡þ[ to reduce flooding and erosion? (see p,46) D 3, t Ctlaracteristics of surface water flows out of the wetland unit Unit is a depression with no surface water leaving it (no outlet) Unit has an intermittently flowing, OR highly constricted permanently flowing outleffiñE = 2 -Unit is a,,flaI" depressión (Q. 7 ón key),ór in the Flats class, with permanent surface outflow and no obvious natuial outlet ànd/or ouilet is a man'made ditch points = I (If ditch is not permanenttyflowing treat uníl as "intermittentlyflovting") Unit has an unconstricted, or slightly ættllncled, sutface outlet Qtermanet D 3.2 Depth of storage during wet periods Estimate the height ãf pondiig above the bottom of the outlel. For units with no outlet measurefrom thi surface of permanentwater or deepest part (¡f 4ry)' Marks oiponding are 3 ft or more above the surface or bottom of outlet The wetland is a "headwater" wetland" Marks of ponding between 2 ft to < 3 ft from surface or bottom of outlet Marks are at leasi 0.5 ft to < 2 ft from surface or bottom of outlet þñfl= 3 Unit is flat (yes to Q. 2 or Q. 7 on key) but has small depressions on the surface that trap water Points = I Marks of ponding less than 0.5 ft D 33 Contribution of wetland unit to storage in the watershed Estimate the ratio of the area of upstream basin contributing surface water to the wetland to the area of the wetland unil itself' The area of the basin is less than l0 times the area of unit The area of the basin is l0 to 100 times the area of the unit The area of the basin is more than 100 times the a¡ea of the unit points = 0 Entire unit is in the FLATS class D 4. Does the wetland nn¡t have the opportunitv to reduce flooding and erosion? Answer yES if the unit is in a location in the watershed where the flood storage, or reduction in water velocity, it provides helps protect downstream properly and aquatic resources from flooding or exóessive and/ór erosive flows. Answer NO if the water coming into the wetlanã is controlled by a structure such as flood gate, tide gate, flap valve,îeservoir etc. OR you estimate that more than9}%o of the water in the wetland is from ground\ryater in areas where damaging gloundwater flooding does not occur. Note wh¡ch of theþttowingindicators of opportunity apply' -Wetland is in a heaãwater of a river or stream that has flooding problems -v/etland drains to a river or stream that has flooding problems j Wetland has no outlet and impounds surface runoffwater that might otherwise flow into a river or stream that has flooding problems fOfAL -Hydrologic Functions Multiply the score from D-3 by D 4 Add score to table on P. I August 2004 Wetland name or number Lappll to,wcflønds of øll ÉIGM'classgs. H¿BtîntF¡-INCTI.ONS -IidiCators.thàt unit funotionç to provide.importanl habit4t H 1. Does the wetland unit have the pg!g1!þ¡ to provide habitat for many specie.s? P,oints (onlyl scgrç psrbox) 1.1 Vegetation structure (see p. 72) Clrr"k ne ryprt o|vegetation classes present (as defined by Cou,ardin)-Size threshold þr each class is % aa.e or more than 10% of the area if unil is stnallet'than 2.5 acres. Aquatic bed Emergent plants >áscrubishrub (areas where shrubs have >30% cover) ' Forested (areas where trees have >30% cover) If the mit has a þrested class check if _The forested class has 3 out of 5 strata (canopy, sub-canopy, shrubs, herbaceous, moss/ground-cover) that each cover 20Yo within the forested polygon Add the number of vegetation structures that qualify. If you have: Map of Cowardin vegetation classes 4 structures or more 3 structures 2 structures /fJGù,uÐ points = 4 points = 2 points = I points = 0 =¡g ure D H 1.2. Hydroperiods (see p, 73) Checkih, typrt ofv,ater regimes (hydroperiods) present within the wetland. The water regime has ii cove, more than 10% of the wetland or % acre lo counl. (see text for 4 or more tYPes Present Map of hydroperiods points = 3 points = 2 point = 1 points = 0 de s cr ipt i ons of hydr operi ods) Permanently flooded or inundated )z-'seasonally flooded or inundated Occasionally flooded or inundated _Saturated only -Lake-frínge wetland = 2 Points Freshwater tidal wetlond = 2 points Seasonally flowing stream in, or adjacent to, the wetland Figure Ò > 19 species 5 -19 species < 5 species Ifyou counted: List specíes below ifyouwant to: 1.3. Richness of Plant Species (see p. 75) Count the number of plant species in the wetland that cover at least 10 ff' of the same species can be combined to meet the size threshold) You do not have lo name the sPecies. Do not include Eurasian Miþit, reed canarygrass, purple loosestrife, (dffirent patches Canadian Thistle PE45<2t &,# q Total for page Wetland Rating Form -western August 2004 rWashingon 13 version 2 (L Wetland name or number ¿/2_ ----I{ 1. TOTAL Score -potential for Providing habitat t7 ¡ Add the scores HL1. H|.2, HL.3, HL.4.1{1,! L:---l Wetland Rating Form -western Washington t4 version 2 1.4. Interspersion ofhabitats (see p.76) Dggid;To. the¡iagrams UetorÃ,whether interspersion between Cowardin vegetation classes (described in-H t . t ¡, or the classes and unvegetated areas (can include open water or mudflats) is high, medium, low, or none. Moderate = 2 Points friparian braided channels] NOTE: If you have four or more classes or th¡ee vegetation classes and open water the rating is always "high". Use map of Cowardin vegetation classes roure H L5. Special Habitat Features: ls¿e p. 77) Check th" hob¡øtfuurrt that ãre present in the wetland. The number of checks is the -number of points you put into the next column' (.Lurg",¿o*ne¿, woody debris within the wetland (>4in. diameter and 6 ft long). ,(Standing snags (diameter at the bottom > 4 inches) in the wetland Undercut banks are present for at least 6.6 ft. (2m) and/or overhanging vegetation extends at least 3.3 ft (1m) oul, u stream (or ditch) in, or contiguous with the unit, for at least 33 ft (10m) _Sìable'steep banks of fine material that might be used by beaver or muskrat for denning (>3gdegrée slope) OR signs of recent beaver activity are present (cut shrubs or trees that have not yet turned greY/brown) _At leastt/o acreof thiã-siemmed persistent vegetation or woody branches are present in areas that are permanently or seatonuily inundated. (s tructures þr egg'laying by amphibians) -Invasive plants covér less than25ô/oof the wetland area in each stratum of plants NOTE: The 20% stated in early printings of the manual on page 78 is an error. Comments August 2004 \iletland name or number 7-H 2. Does the wetland unit have the opportunify to provide habitat for many species? H 2.1 Buffers (see p. 80) Chooy th, drscripîion íhat best represents condition of bufer of wetland miL The highest scoring críterion that applies to the wetland ¡t to be used in the rating. See text for definition of "undisturbed. " -100 m (330ft) ofrelatively undisturbed vegetated areas, rocþ axeas' or opel Tat:r >95yo of circumference. No sÚuctures are within the undisturbed part of buffer. (relatively undisturbed also means no-gtazing,no landscaping' no daily human use) Points = 5 -100 m (330 ft) of relatively undisturbed vegetated areas, rocþ areas' or open w?ryr=-,\ 50olo circumference. {-Ù.Þ-=-+'--50 m (170fr) ofrelatively undisturbed vegetated areas, rocky areas, or open water>95olo circumference. Points = 4 -100 m (330ft) of relatively undisturbed vegetated areas, rocky areas, or openwaler > 25o/o circumference, . Points = 3 -50 m ( I 70fr) of relatively undisturbed vegetated areas, rocky areas' or open water for > 50% circumttttntTourr"r Points = 3 does not meet any of the criteria above -No paved areas (except paved trails) or buildings within 25 m (S0fr) of wetland > 95o/o circumferen".. Lignftomoderate gtazing,or lawns are OK' Points = 2 -No paved areas or buildings within 50m of wetland for >50% circumference. Light to moderate grazing, or lawns are OK. Points = 2 -H*"y grazingin buffer. -Points = I -Vegeiated buifers are <2mwide (6.6ft) for more than 95o/o of the circumference (e.g. tilled freiãs, paving, basalt bedrock extend to edge of wetland Points = 0' -Buffer does not meet any of the criteria above. Points = 1 Figure _ H 2.2 Conidors and Connections (see p, 81) H 2,2.1 Is the wetland part of a relätively undisturbed and unbroken vegetated corridor (either riparian or uptanA¡ that is at leasi t S0 ft wide, has at least 300/o cover of shrubs, forest or native undisturbà prairie, that connects to estuaries, other wetlands or undisturbed uplands that are at leait 250 acres in size? (dams in riparian corridors, heavily used g'avel ràads, paved roads, are considered breaks in the corridor)' YES = 4 points (go to H 2.3) NO = go toH2'2'2, H Z.2.Z ls the wetland part of a-relatively undisturbed and unbroken vegetated corridor (either riparian or upland¡ that is at teasi SOft wide, has at least 30o/o cover of shrubs or forest, and connects to estuaries, other wetlands or undisturbed uplands that¿re at least 25 acres in size? OR a Lake-fringe wetland, if it does not have an undisturbed corridor as in the question above? YES = 2 points (go to H 2.3) H2.2.3Is the wetland: NO = H 2.2.3 within 5 mi (8km) of a brackish or sal!;g OR within 3 mi of a large field or pastur(>4O acies) Q Total for page Wetland Rating Form -western Washinglon version 2 15 August 2004 Wetland name or number L Wetland Rating Form -western Washingfon 16 August 2004 version 2 H 2.3 Near or adjacent to other prioritv habitats listed by WDFW (see p. 82) Which of the following priority habitats are within 330ft (100m) of the wetland unit? NOTE: the connections do noÍ have to be relatively undislurbed. These are DFW defìnitions. Check with your local DFW biologist if there are any quesÍions. X R¡parian: The ãrea adjacent to aquatic systems with flowing water that contains elements of both aquatic and tenestrial ecosystems which mutually influence each other. Aspen Stands: Pure or mixed stands of aspen greater than 0'8 ha (2 acres). -Cliffs: Greater than7.6 m (25 ft) high and occurring below 5000 ft. _OtO-growth forests: (Old-growh west of Cascade crest) Stands of at least 2 tree species, -forming a multi-layered canopy with occasional small openings; with at least 20 trees/ha (8 trees/acre) > 8l cm (32 in) dbh or > 200 years ofage. Mature forests: Stands with average diameters exceeding 53 cm (21 in) dbh; crown cover may be less that 100%o; crown cover may be less that 100%; decay, decadence, numbers of snags, and quantity of large downed material is generally less than that found in oldgrowth; 80 -200 years old west of the Cascade crest. Prìiries: Relatively undisturbed areas (as indicated by dominance of native plants) where grasses and/or forbs form the natural climax plant community' Talus: Homogenous areas of rock rubble ranging in average size 0.15 -2.0 m (0.5 -6.5 ft), composed oibasalt, andesite, and/or sedimentary rock, including riprap slides and mine tailings. May be associated with clifß. Caves: A naturally occurring cavity, recess, void, or system ofinterconnected passages _Oregon white Oak: V/oodlands Stands of pure oak or oak/conifer assobiations where canopy coverage ofthe oak component ofthe stand is25%o. _UrbarÑatural Open Space: A priority species resides within or is adjacent to the open space and uses it for breeding and/or regular feeding; and/or the open space functions as a a conidor connecting other priority habitats, especially those that would otherwise.be isolated; and/or the open space is an isolated remnant of natural habitat larger than 4 ha (10 acres) and is sunounded by urban development. EstuaryÆstuary-like: Deepwater tidal habitats and adjacent tidal wetlands, usually semi--encloied by land but with open, partly obstructed or sporadic access to the open ocean, and in which ocean water is at least occasionally diluted by freshwater runoff from the land. The salinity may be periodically increased above that of the open ocean by evaporation. Along some low-energy coastlines there is appreciable dilution of sea water. Estuarine habitat extends upstream and landward to where ocean-derived salts measure less than 0.5ppt. during thé period of average annual low flow. Includes both estuaries and lagoons. lfaiine/Estuãrine Shorelines: Shorelines include the intertidal and subtidal zones of beaches, and may also include the backshore and adjacent components of the terrestrial terrestrial landscape 1e.g., óliffs, snags, mature trees, dunes, meadows) that are important to shoreline associated fish and wildlife and that contribute to shoreline function (e.g., sand/rock/log recruitment, nutrient contribution, erosion control). If wetland has 3 or more priority habitats = 4 points If wetland has 2 priority habitats = 3 points If wetland has 1 priority habitat = 1 point No habitats = 0 points Note: All vegetated wetlands are by definition a priority habitat but are not included in this list. wetlands are addressed in question H 2.4 ,L g z+ Wote the one description of the landscape around the wetland that best /ìts) (see p, 84) There are at least 3 other wetlands within Yzmile, and the connections between them are relatively undisturbed (light grazing between wetlands OK, as is lake shore with some boating, but connections should NOT be bisected by paved roads, fill, fields, or oÇ, development. Fo'nf --P The wetland is Lake-fringe on a lake with little disturbance and there are 3 other U.k€lûifÉe wetlands within %milé Points = 5 There are at least 3 other wetlands within Vzmile,BUT the connections between them are The wetland is Lake-fringe on a lake with disturbance and there are 3 other lake-fringe wetland within %mile Points = 3 There is at least I wetland within %mile. There are no wetlands within Yzmile. TOTAL for H I from Page 14 Total Score for Habitat Functions -add the points for H 1 ,H2 and record the result on Wetland name or nu b", L 5 Wetland Rating Form -western Washingfon version 2 H 2. TOTAL Score -opportunity for providing habitat Add the scores H2.1.H2.2. H2.3, H2.4 ï: ?_-ü+ l7 August 2004 Wetland name or nurnbe, 2 Please determÍne if the wetland meets lhe attributes descríbed below and circle the Wetland Rating Form -westem Washingfon version 2 øppropríate ønswers ønd cølegory. Wetland Type Check offany critería that apply to the wetland. aonrooríate criteria are meL Circle the CategorYwhen the Category SC 1.0 Estuarine wetlands (see p, 86) Does the wetland unit meet the following criteria for Estuarine wetlands? -The dominant water regime is tidal, -Vegetated, and -With a salinity greater than 0.5 ppt. ./YES = Go to SC l.l NO/r SC l.l Is the wetland unit within a National Wildlife Refuge, National Park, National Estuary Reserve, Natural Area Preserve, State Park or Educational, Environmental, or Scientific Reserve designated under WAC 332'30'151? YES = Category I NO go to SC 1.2 Cat.I SC 1.2 Is the wetland unit at least I acre in size and meets at least two of the following three conditions? YES = Category I NO = Category II -The wetland is relatively undisturbed (has no diking, ditching, filling, cultivation, grazing, and has less than l0olo cover of non-native plant species. If the non-native Spartina spp. are the only species that cover more than l0% of the wetland, then the wetland should be given a dual rating (I/Il). The area of Spartina would be rated a Category II while the relatively undisturbed upper marsh with native species would be a Category I. Do not, however, exclude the area of Spartina in determining the size threshold of I acre. -At leasttâ of the landward edge of the wetland has a 100 ft buffer of shrub, forest, or vn'grazed or un-mowed grassland. -The wetland has at least 2 of the following features: tidal channels, depressions with open water, or contiguous freshwater wetlands. Cat.I Cat.II Dual rating VII 18 August 2004 Wetland name or nu.b", % Wetland Rating Form -westem Washington 19 August 2004 version 2 SC 2.0 Natural Heritage Wetlands (see p. 87) NaturalHeritage wetlands have been identified by the Washington Natural Heritage Program/DNR as either high quality undisturbed wetlands or wetlands that support state Threatened, Endangered, or Sensitive plant species. SC 2.1 Is the wetland unit being rated in a Section/Township/Range that cont¿ins a Natural Heritage wetland? (this question is used to screen out most sites beþre you need to contact WNHP/DNR) S/T/R information frorn Appendix D -or accessed from WNHP/DNR web site -YES -contact WNHP/DNR (see p. 79) and go to SC 2.2 No2( 5C2.2 Has DNR identified the wetland as a high quality undisturbed wetland or as or as a site with st¿te threatened or endangered plant species? YES = Category I ¡g ¿<not a Heritage Wetland Cat.I SC 3.0 Bogs (see p. 87) Does the wðtland unit (or any part of the unit) meet both the criteria for soils and vegetation in bogs? Use the key below to identifu if the wetland is a bog. If you answer yes you wílt stíll need to røte the wetland bøsed on its functìons, I . Does the unit have organic soil horizons (i.e. layers of organic soil), either peats or mucks, that compose 16 inches or more of the first 32 inches of the soil profîle? (See Appendix B¡fù\a fîeld key to identify organic soils)? les -sotoQ.3 (Nd -gotoQ.2 2. Does the unit have organic soils, either peats or mucks that are less than 16 inches deep over bedrock, or an impermeable hardpan such as clay or volcanic ash, or that are floating on a laþ or pond? Yes -go to Q. 3 6ir) ft not a bog for purpose of rating 3. Does the unit have more thanT0o/o cover of mosses at ground level, AND other plants, if present, consist of the "bog" species listed in Table 3 as a significant component of the vegetation (more than30Vo of the total shrub and herbaceous cover consists ofspecies in Table 3)? Yes -Is a bog for purpose of rating No -go to Q. 4 NOTE: If you are uncertain about the extent of mosses in the understory you may substitute that øiterion by measuring the pH of the water that seeps into a hole dug at least 16" deep. If the pH is less than 5.0 and the "bog" plant species in Table 3 are present, the wetland is a bog. L Is the unit forested (> 30o/o cover) with sitka spruce, subalpine fir, western red cedar, westem hemlock, lodgepole pine, quaking aspen, Englemann's spruce, or \uestern white pine, WITH any of the species (or combination of species) on the bog species plant list in Table 3 as a signifrcant component oftne ground cover (> 30% coverage ofthe total shrub/herbaceous cover)? 2. YES = Category I No-Is not a bog for purpose of rating Cat.I wetland name or number 4" Wetland Rating Form -western Washingfon 20 August 2004 version 2 SC 4.0 Forested Wetlands (see p. 90) Does the wetland unit have at least 1 acre of forest that meet one of these criteria for the Department of Fish and Wildlife's forests as priority habitats? If you answer yes you will stíll need to rate the wetland based on its functions' Old-growth forests: (west of Cascade crest) Sønds of at least two tree species, formlng a multi-layered canopy with occasional small openings; with at least I trees/aõre (20 trees/hectare) that are at least 200 years ofage OR have a diameter at breast height (dbh) of 32 inches (81 cm) or more' NOTE: The criterion for dbh is based on measurements for upland forests. Two-hundred year old trees in wetlands will often have a smaller dbh because their growth rates are often slower. The DFW criterion is and "OR" so old-growth forests do not necessarily have to have trees of this diameter. -Mature forests: (west of the Cascade Crest) Stands where the largest trees are 80 -200 years old OR have average diameters (dbh) exceeding2l inches (53cm); cio*n cover may be less that 100%; decay, decadence, numbers of inags,'and quantity of large downed material is generally less than that found in old-growth. YES = Category I NO ¡l not a forested wetland with special characteristics Cat.I SC 5.0 Wetlands in Coastal Lagoons (see p.91) Does the wetland meet all of the following criteria of a wetland in a coastal lagoon? -The wetland lies in a depression adjacent to marine waters that is wholly or partially separated from marine waters by sandbanks, gtavel banks, shingle, or, less frequentlY, rocks -The lagoon in which the wetland is located contains surface water that is saline ór brackish (> 0.5 ppt) during most of the year in at least a portion of the lagoon (needs to be measured near the bottom) YES = Go to SC 5.1 NO :&ot a wetland in a coasøl lagoon SC 5.1 Does the wetland meets all of the following three conditions? -The wetland is relatively undisturbed (has no diking, ditching, filling, cultivation, grazing), and has less than 20%o covet of invasive plant species (see list of invasive species on p. 74). -Át least/cof the landward edge of the wetland has a 100 ft buffer of shiub, forest, or un-grazed or un-mowed grassland' -The wetland is larger than 1/10 acre (4350 square feet) nES = Category I NO = Category II Cat.I Cat.II tVetland name or nu b",'U SC 6.0 Interdunal Wetlands (see p, g3) Is the wetland unit w_est of the 1889 line (also called the Western Boundary of Upland Ownership or WBUO)? YES -go to sc 6.1 No /t$t an inrerdunal wetland for rating If you answer yes you will stìil need to iate the wetland bøsed on íts functíons, In practical terms that means the following geographic areas: . Long Beach Peninsula-Iands west of SR 103 . Grayland-Westport-lands west of SR 105 . Ocean Shores-Copalis-lands west of SR I l5 and SR 109 SC 6.1 Is the wetland one acre or larger, or is it in a mosaic of wetlands that is once acre or larger? YES = Caregory II SC 6.2 Is the unit between 0.1 and I acre, or is between 0.1 and I acre? YES = Caregory III . NO -go to SC 6.2 it in a mosaic of wetlands that is Cat.Il Cat.III '€,btegor..y,of weúiaùd bas.ed qn, ßp.occhaai e iùe " ¡li ghest " ratt&g if le.ãW.fdils ¡rrto i*ã wleggries ; and record on p. 1. Ifvou ãnswered No for all [vpes enter'TIot appiicaËler? on p'.'l ñ /"q Wetland Rating Form -western Washington 2l version 2 August 2004 t2 Appendix 2. Functional Assessment Rating Forms. Yelm Community Schools Proposed Transportation Center September 2009 lüetland Analysis Report Wetland and Buffer Functions and Semi-quantitative Perfgrmance Assessment Wetland # \iP\.t-^, LAtû'\¡. Ssr\\oots \Ðu4 t Location S T R Date 9,-ro -oQ Funcfion Crite¡ia Group 1 1 pt Goup2 2pts Group3 3 pts ' Flood/Storm Water Controlâ poinE_/(max 15) l! size<Sacres _ riverine oilal€snore wetlancl È < 10 0/6 foresedcover _ un@nst?hed ouüet _ located in þ'¡,er 1ß of the drainage _ sÞe 5-10 acæs _ miJ-Soped$reüand -l0-æo/bbrestedcover j-semi-con$ainedouÚet ,<. located in m¡ddþ 1ß of ñe 6ainaç _ size > 10 açres 5 æpresslns, heacluaters, bogsfe¡s _ > 30 o/o foresteclcovor _ culverübermed ouüe{ _ locded ¡n upperlß of fie drahage Base Flow/Ground Water Support æ¡nslO (max 15) 5 size.5 acres -rirærine orlal€sñore u¡etlànO _ located in lou¡er 1ð of tñe drainage _ temporajly flooded or sâ¡urâted _ no flow-sensitive ñsh populations on-site or dowrìsream _ sÞe5-10 acres _ mid-$oped\^æúand Jß located in mijdþ 1ß of rle dainagp l: seasona,ly or semLpermanently looded orsdurated ¿< low fiow-sensitive fi$ populations on-site or c,ou,n$ream _ s¡ze > 10 acres X depressions, headualers, bogs,îaÌs _ .localed in upær1ß of hodrdræe _ pemanendyflood€d orsduraÞd, or intermineilty exposod high flow-sen$ttvo pogrlatons conti?uous witr Ste in h¡ghly ærmeable srata Erosion/. , shoret¡n"Ñ /A P rotectio n points _ (ma,\ 9) sparse grassherbs or no veg aþng r¡v€üand extencrs < w¡ff trom i¡fifi devdoæd sñordine or sparse \ ood or veg âþng 'rr,€üand extends 30 -60 (þnso u,ood orveg aþng OFWM mfrom undçvéþped sfrordirìe or Water Quality lmpro.vement t,nOË (max 12) _ rapil fow through site _-< 50 Vo veg Cover _ upsüeam in basin trom wedand is undev€bped -hokls < 25 qo ovefand runoff Jd mod€rete flowthrough site ¡( so -Bo o/o cowr < < 5Os6of basin upsueam from '&€dend b deì/eloæd ( rrorcæ -509ooverland runoff _ sþw ñow hrough site _ >8oo/ovegcover _ > 50Vo of basin upsüeam from $,€üand b d€veþped _ holds > æ Eo ovelancl runoff A=Not N/l = No informatíon availa.ble Dominant Vegetation: Wildlife: Wetland and Buffer Func,tions and Semi-quantitatíve Performance Assessment \)L-¿h I Natural Biological Support polntsG, (max 36) >._ r3 gK size<sacres x] ag land, low veg structure X seasonalsurface waler l< onehaþ(at$F.-PAB POW (ELÈSS PFO EST 5 low plant diversity (< 6 species) > 50 o/o invasive species low primary productivity low organic accumulation loworgan¡c export few hatftat features buffers very disturbed isolated from upland habitats size5-10acres 2 Þvel veg permanent sirface watef t\4o hatilal types PAB POW PEil,I PSS PFO EST moclerate Plant diversrty (7'15 species) 101o 50 o/o invasive species moclerate pnmary Productivity modsrate organic accumulet¡on loworganic export some habitd Þarures buffers $ghüy distrrtbed partially conneded to upland habitæ -K. x9\ _ sizo > 10 acres high veg stnjûure _ openwaterpoolsthrougharmmer _ > 3 hablattlpes PAB POW PEM PSS PFO EST _ hrsh plant diversrty (> 15 spec¡es) < 10olo invasive species _ hrsh pr¡mary produdivity _ high organic accumulaÍon _ hrsh organic export many haþ¡td fedufes _ butfers not d¡sturbed _ ,rvell connec1ed to upland hâbitâF Overall l'labitat Functions poinß$ (max 9) sÞe < 5 acres lowhaþitat diversity low sanctuary or refuge LYæ _ size 5-10 acres _ moclerate habitat divefsity -moderate sanduary or refuge size > 10 acres high habilat diveßity high sanctuaryor retuge Specif ic Habitat Functions pontsf (max 15) ,< lowinverteþrate habitat ¿< þwamphiuan haþita¡ Æ lowfish hafitat 1! lowmammal haþnat 5 towtr¡ønaotat moderate ¡nvenebrate haþitat moderate amphbian hablat moderate n$t hablat moderate mamm al haþitat moderate tifd habital high invenebft¡te habitd high amphib¡an habiht high fsh habilat high mammal hab¡tal high bird habitat Cultural/S oc i oeconomicæ¡ntstrl (max 21) low educational opporunfties low aesthetic value lacks commercial tisheries, agriculuro, renewable resou rces lacks hisorical or archeological resources lacks pass¡ve ancl active recreational opporlun ities privately owned nct neâf open space ,< X2sxxa)_< -moderae edjcational oppoftunities _ moderatg /aesüetic value _ moderate commercial fisheries, agrixrlhjr€, renewable resourc€s _ historical or archeolog¡cal site _ some passiv€ and active rocreational opportun ities _ privately owned, some public access -someconnecÍþntoopenspace _ high educational opporujnitþs _ hþh aesfieticvaluo _ hrsh commercial fishories, agriculture, renewable rgsourDes _ important hisorical or afcheologiral sile _ many passi\€ and adiv€ recrÞational opporninities _ unresfided publ¡c access _ direclly conneded to open spaco Notes: -werlan¿ * \r.)t e? -Yø*rt Cz-ra¡4 : st"n3pz:g¿=-p¿¡s q-ro ^ o 9 bC-\\crø\-g Wetland and Buffer Funaions and Semi-quantitative Performance Assessment available Wildlife: N/A = Appl'cable, I Dominant Vegetation: Location S T R Function Criteria Groupl 1pt Group2 Zpts Group3 3 pts I Flood/Storm Water Control *,nol-D (max 15) 5 size<Sacres _ riverine or rake$¡ore wetlancl _ <100óforesedcover _ uncorìsûahedoudet _ locatedin þì,!er1ß of he dra¡nage _ sÍze 5-10 acres _ mid-doped'.t€dand I to-æotbfeçedcover È! semiconsrainedoude( lS tocatø ¡n miJdþ 1ß of tne dainage _ sÍze > 10 acres r(-depressir:ns, heaclwaters, bogs,nats _ > 30 o/o foresed cover _ culven/bemedot¡üet _ located in upporlß of the drahage Base Flow/Ground Water Support poinsJ-o (max 15) & "u".5 acres -riverine orlal€$ore \^eüànd _ þcated in louær 1¡3 of üe drainage _ lemporajly ñooded or sa$rated _ n0 now.sensitive ñsfr populations on-site or clou,nstreem -size 5-10 acfes _ mid-doped$€dand ,< bcated in miütþ 1ß oftñe dainege lË! seasonalty or semi{emanently ñooded orsduraled ìl bw flow-sensitive fsfi populations on-site of cþì¡nsfeam _ size > 10 acres É Oepæsons, headu/a¡ors, þogs,frats _ locded in upperlß of hedrahage _ pemanendynooc,ed orsaur&d, or intermittenüy exposed high now-sensitive populd¡ons cont¡guous wih site in hþhly permeable sraþ points _ (max 9) Erosion/Jþ Shoreline I Protection -sparse grass,herbs or òo veç¿óng OHWM -uleüjnd'áxiãnds <30 m from 9{wM Jnpn¡y ævdoped $ordine or ,/sjbcatcf¡ment ( Spafse $'ood orveg aþng OHWM ì¡¡eüand extends 30 -60 m from OHWM undeveb Water Quality lmprovement *'no ? tirax tef _ raplC low ürougúì site }( <50Vovegcover _ upsteam in bas¡n fÍom rcüand is undeæbæd _ holds <z5yooverland runotf É roo"*r flow through site -50 -80 o/o @r€r U4 s 50sóof ba$n upseam from ,r.¡edand bdewloæd K hokts2s -Soqooærland runoff _ sbw nowhrough slo ->800/ovegcover _ > Sotlzo of bash upsüeam ûom \^,edand b developed _ hokts > 50 Eo oveland runoff Not 'cable. N/l = No Wetland and Buffer Functions and Semi-guar¡titative Performance Assessment {z) Natural Biological Support æ¡ntrl-L2 (max 36) _É T( Êåì< ¿. : size < 5 acres ag land, low veg struct re seasonal sulace water onehabtaùpe ^ PAB Pow pev b9pro esr low dant diversity (< 6 species) > 50 o/o invasive species low primary product¡vity low organic accumulation loworganþ export lew habitat Þatures buffers very dislurbed isolated from uplend habitats -size 5 -10 acres -lS 2þvelveg -pefmanent $irface water _ tr¡/o ha¡itat t¡pes PAB POW PEM PSS PFO EST -moderatePlaildiversrty( '15 species) 10 to 50 o/o invasive spscies -moderate pr¡mary Productívity -modorate organ¡c accumulat¡on _ low organ¡c export X some haþitd features ì4 buíers$ghüydisturbed l9 panially ænnected to upland habatats _ sizo > 10 acres _ high veg stncture _ open water pools thongh summer -> 3 hablat¡,pes PAB POW PEM PSS PFO EST _ hrsh plant diveßity (> 15 specios) < 1@/o invasive species _ hrsh primary productívity _ high organ¡c accumulation _ h¡gh organic expori _ many habitai feãures _ buffers not disturbed _ $€llconnectedto uplandhabita¡s Overall Habitat Functions pointsQ (mÐ(9) )¿ x\( size < 5 acres low habitat diversity low sanctuary or refuge _ size 5-10 acres _ moderate habitat d¡versity -moderatesanctuaryorrefuge s¡ze > 10 acres high habilat diversity high sanduaryor r€tuge Specif ic Habitat Functiols poinßÞ (max 15) l< Ev Èlow invenebrate habitat þw amphibian habital lowfish habitat low mammal habnat low b¡rd habitat moclerale invertebrate habitat modeft¡te amphÞ¡an hab¡at moderate fist hablal moder¿ûe mammal habitat moderate Þird habitat high inveneþfate hab¡ta high amphiÞian habiht high fish hablat high mammal habital high bird hebitat Cultural/Socioeconomicpointsf (max 21) .L*É x É_ *E low educationel opponunities low ae$hetic value lacks commercial nsheries, agrkrulture, renewaþle resou rces lactG historical or archeological rosoufces lacl(s pass¡ve and aoive recreaüonal opponun ities pf¡vâtely owned not near open space -moderaþ edjca¡bnal oppomjniti€s _ moderaE/aesüeticvalue -moderate commercial fi$eries, agri:r.rlturo, renewable resources _ hisorical or archeologicel site _ some passive and active recreat¡on aJ opponunities -privately owned, some Puþlic access _ some connedion to open space _ higheducaüonalopporUnitþS _ htgh aesfietic valug _ hrgh commercial nshorigs, agriojlture, renewable r€sources _ imponant hislorical or afcheological site _ many passiv€ and active fecfeaüonal oppoftunities _ unfestided publ¡c access _ direcllyconnededtoopmgace Notes: 13 Appendix 3. Scientific names of plant species that occur on the site. CommonName Lafin Name Wetland Indicator Stâfus* Douglas fir Oregon ash black cottonwood osoberry salmonberry snowberry Nootka rose red osier dogwood thimbleberry ocean sPray Oregon grape red elderberry stinging nettle cutleaf blackberry bracken fern Canada thistle Himalayan blackberry hailing blackberry reed canary grass Pseudotsuga menziesü Fraxinus latifolia Populus balsamifera Oemleria cerasiformis Rubus spectibilis Symphoricarpos albus Rosa nutkana Cornus stolonifera Rubus parvifolius Holodiscus discolor Mahonia nervosa Sambucus racemosa Urtica dioica Rubus laciniatus Pteridium aquilinum Cirsium arvense Rubus discolor Rubus ursinus Phalaris arundinacea FACU FACW FAC FACU FAC FACU FAC FACW FACFACU FACU FAC+ FACU+ FACU FACU+ FACU FACU FACW * Indicator status according to Reed (1988), Pacific Northwest Region. OBL = occurs in wetlands 99o/o of time FACW = occurs in wetlands 67-99o/" of time FAC = occurs in wetlands 34-660/0 of time FACU = occurs in wetlands I-33% of time UPL = occurs in uplands 99o/o of time NI = indicator status not known in this region Yelm Community Schools Proposed Transportation Center lüeil an d An alys i s Rep or t September 2009 l4 Appendix 4. Field Data Forms. Yelm Community Schools Proposed Transporlation Center September 2009 lletland Analysis Report DA,TA FORM I (Revised) Routine Wetland Determination (\{A State Wetland Delineation Manual or IVetland Date: 1-ta-oq counry{:ftt F8T2Ñ :HÄ. VA Project/Site: Núv.-^ C¡ru*¿. Çc-nro¿ou9 --fß,\pg, t&çlØ? applicant/ownel: Ë \lÉ\-+4 ô.or o.^,, =4-\Àê¿a-3 Community ID:.* Transect lD: u-' PlotID: +1 .'.,,-)L gtffi Do Normal Circumstances exist on the site? Is tþe site significantly disturbed (atypical situation)? Is the area a potential Problem Area? Explanation of atvoical or (For strata, indicate T = tree; S = shrub; H = herb; V = vine) Oç F.-xø ìu-Z(r^rulrp HYDROPHYTIC VEGETATION TNDICATORS: %o of dominants OBL, FACW, & FAC Wgj-Check all indicators that apply & explain below: Visual observation of plant species growing in Physiological/reproductive adaptations Wetland plant database Personal knowledge of regional plant communities areas of prolonged inundatior¡/saturation Ilydrophytic vegetation present? Rationale for decision/Remarks: f.u->P Aß.ç, Ç^.-,^' r Dept. of inundation: '? inches Oxidized Root (live roor) Local Soil Survey: yes no Depth to free water in piu to saturated soil: -inches -inches FAC Neutral: Yes no Check all that apply & explain below: Stream, Lake or gage data: \iletland hydrology present? Rational e for decisionlRemarks: ì rJDicÃToPå ot39€+!tÞ * SOILS Map Unit Nurn. tf (Series & Phase) \--t-' Taxonom NOTES: Field observations confirm @Profile Description Depth (inches) Horizon Matrix color (lr4unsell moist) Mottle colors (lr4unsell moist) Mottle abundance size & contrast Texture, concretions, structure, etc. Drawing of soil profile (match descriotion) D-rØ A rr¡qdr G ,4, çf \¿(r't Hydric Soil lndicators: (check all that apply) Histosol Histic Epipedon Sulfidic Odor Aquic Moisture Regime ç--ReducingConditions F Gleved or Low-ch¡oma (=l) matrix Matrix chroma < 2 with mottles Mg or Fe Concretions High Organic Content in Surface Layer of Sandy Soils Organic Streaking in SandY Soils Listed on NationaVlocal Hydric Soils List Other (explain in remarks) -Ilydric soils present? ÆÑl Rati onale for decision/Remarks-: ræ no È 1S:q-á, ¿'-' <þtu>'og #rt.Êf) Wetland Determination (circle) \ Hydroph¡ic vegetation present? [1" Hydric soils present? \ !"t Wetland hvdrolow oresent? \ ves no no Is the sampling point è within a wetland? no no Rationale/Remarks: 7t¡t":,--3 pÊ P+t < q{44 e'g>æ-'\/EÐ, Revised 4/97 DATA FORM I (Revísed) Routine Wetland Determination (WA State \iletland Delineation Manual or f987 \iletland Delineation Man Date: 1-ro-øq Counry-7&,Jß*f,PrJ State: \^lA SÆ/R: Project/Site: Núvr-¿ C¡rr.^"r-t . Çc¡re¡oLÞ ---rß{pÇ-, Wþfø? Applioant/ownel: Ét \l¿\-H. Ca¡..noa . ä;uoør-S Community D: Transect D: ---Plot ID: 3p Z-r¡p 6, Þr-9 Do Normal Circumstances exist on the site? Is tþe site significantly disturbed (atypical situation)? Is tlre area a potential Problem A¡ea? VEGETATION (Forstrata, indicateT=tree; S =shrub; H= herb; V =vine) Õf @A ¡-L Dominant Plant Soecies Stratum Yo æver Indicator Dominant Plant Speci HYDROPHYTIC VEGETATION INDICATORS: % of dominants OBL, FACW, & FAC I Check all indicators that apply & explain below: Visual observation of plant species growing in areas of prolonged inundatior/saturation Physiological/reproductive adaptations Wetland plant database Personal knowledge of regional plant communities Ilydrophytic vegetation present? Rationale for decision/Remarks: Is it the growing seqsoh? ,/Based on: l./soil temp Oxidized Root (live rooæ) Local Soil Survey: yes no <12 in. ves no Depth to fiee water in pit: -inches to saturated soil: inches FAC Neutral: Yes no Vy'ater-stained Leaves yes no Check all that apply & explain below: Stream, Lake or.gage data: ial ohotosraohs: Other: Wetland hydrology present? Rationale for decision/Remarks: f,)Ð |tIÞur*-3 \Ðc-reÃ-üê( | Drainage ç1ur, 'Froovrrt -be-' Profile Desciintion Depth (inphes) Horizon Matrix color (Munsell moist) Mottle colors (Munsell moist) Mottle abundance size &. contrast Texture, concretions, structure, etc. Drawing of soil profile (mæcn_¿escriBlion) 9-te A ."uø4, Ca , ã.rroV L¿t ø [Þ-tL, ß r uqp &li I G Sapxu L.o¡ ¡¿ Ilydric Soil Indicators: (check all that apply) Histosol Histic Epipedon Sulfidic Odor Aquic Moisture Regime Reducing Conditions GleYed or Low-Chroma (=1¡ matrix Matrix ch¡oma S 2 with mottles Mg or Fe Conçretions -High Organic Content in Surface Layer of Sandy Soils Organic Streaking in SandY Soils Listed on National/Local Hydric Soils List Other (exPlain in remarks) Hydric soils present? yes /E Rationale for decision/Remarks: \-/rJr) |\.1 Ut^¿ goiw U.J-Þ\(2ê<taÊg r I Wetland Determination (circle) Hydrophytic vegetation present? yes Hydric soils present? yes Wetland hvdrolosv nresent? ves út Is the sampling point yes ð æ within a wetland? Rationale/Remarks: t-)Ð \>-*. E(¡+þt(¡rtsrft-! -NOTES: Revised 4/97 DATA FORM I (Revßed) Routine Wetland Determination (tilA State Wetland Delineation Manual or 1987 Delineation Date: î_ rO-Crq CountyÍfu.rß+l.P¡J State: \^lA SÆ/R: Project/site: \úvr.¡ C-tr*-ru . Çr--r\caouR --I-g{pg, lîl¡tlØ(-Applicant/ownel: æ \l É\-r4, C.o t..n ..^, . =u-\\oã-S Community ID: ',--Transect D, --Is the area a potential Problem A¡ea? Plot ID: sg '\À-9L-g vçë Exolanation ofatvoical or nroblem al Do Normal Circumstances exist on the site? Is tþe site significantly disturbed (atypical situation)? VEGETATION (Forshata, indicateT=tree; S =shrub; H= herb;V = vine) øÇ Fun¿= L -9 Dominant Plant Species Stratum Yo cover lndicator Dominant Plant Species , Stratum , 7o cover HYDROPHYTIC VEGETATION INDICATOR$: % of dominanrs oBL, FACw, & FAC *JÉ Check all indicators that apply & explain below: Visual observation of plant species growing in areas of prolonged inundatior¡./saturation Morphological adaptations Physiological/reproductive adaptations Wetland plant database Personal knowledge of regional plant plant communities Hydrophytic vegetation present? Rati onale for decision/Remarks: other HYDROLOGY Ir it tf,", gto*ing r.g¡onl @no ./Based on: l-/soil temp (record temP Sy'ater Marks: Yes no Drift Lines: Yes no Drainage Patterns: Yes no Local Soil Survey: yes no to saturated soil: -inches Dept. of inundation: Depth to free water in pit: inches inches FAC Neutral: Yes no Check all that apply & explain below: Other (explain): Stream, Lake or.gage data: Wetland hydrology present? Rationale for decision/Remarks: G.S,O\c;tll,sg-S &*Qt@, SOILS Map unit Name V<>l¿,evn¡¡-Cp , Ç ts Lo^* (Series & Phase) Drainage glutt ¡Føof¿uut ÞÞ. Field observations confirm Yes No Profrle Descriotion Depth (inphes) Horizon Matrix color (lt4unsell moist) Mottle colors (lr4unsell moist) Mottle abundance size & contrast Texture, concretions, structure, etc. Drawing of soil profile (match-¿essdplisu) Õ-q A torP-?' Co , l-o t{ f.z\ \-uø B ,-,r131-5,au'llb C-orttrvt/oat ^ Ce ¡^peøt e: ,l.ø¡u Hydric Soil Indicators: (check all that apply) Histosol Histic Epipedon Sulfidic Odor Aquic Moisture Regime 0..-ReducingConditi ns )ð Gleved or Low-Chroma (=1) matrix Matrix chroma < 2 with mottles Mg or Fe Concretions High Organic Content in Surface Layer of Sandy Soils Organic Streaking in SandY Soils Listed on National/LocalHydric Soils List Other (exPlain in remarks) õ.y.,'csous presen.rffi Rationale for decision/Remarks: v \11>U''<-gatu= o€,>e+\lÐ . Wetland Determination (circle) Hydroph¡ic vegetation present? Hydric soils present? Wetland hvdrolow nresent? Is the sampling sampling Point within a wetland? (à no no no no @Rationale/Remarks: Ì\ At r-\-àg' -\l-{f¿n ¡lØrt4,( Ðæ€/;l,rc, NOTES: Revised 4/97 DATA FORM I (Revised) Routine Wetland Determination (WA State \iletland Delineation Manual or 1987 \iletland Date: ?_ r O *Oq Count¡ffiftrrß+-f.Px) State: \nlÁ. Project/Site: \júvr.^ C¡rr-¡u . Çc-*ec¡us ---rts{pg, l2lølØ? Applicant/ownel: æ \l¿\-H. C-os¡,¡.^, . %c-tr,eca-! Community ID: ¿ Transect lD: ---Is the area a potential Problem A¡ea? Plot ID: gF 4 up crsú Do Normal Circumstances exist on the site? Is tþe site significantly disturbed (atypical situation)? VEGETATION (Forstrata,indicateT=tree;S=shrub;H=herb;V=vine) Ôf q-ñt" i-'a inant Plant Soecies Stratum o/o oover Indicator Dominant plant Species Stratum ø areas of prolonged inundatior/saturation HYDROPHYTIC VEGETATION TNDICATORS: 7o of dominants OBL, FACW, & FAC Õ/Check all indicators that apply & explain below: Visual observation of plant species growing in Physiological/reproductive adaptations It/etland plant database Personal knowledge of regional plant communities Ilydrophytic vegetation present? Rationale for decision/Remarks: Based on: soil temp (record temP ) Dept. of inundation: Oxidized Root (live roots) Local Soil Survey: Yes no Depth to free water in pit: inches inches inches FAC Neutral: Yes no Check all that apply & explain below: Stream, Lake or.gage data: Wetland hydrology present? Rationale for decision/Remarks: l.Jo H1Dùa \âbg oV \ l*)5\r-stt{L5 ' soILs Map Unit Name l-¡Cr\¿¿,r,..¡+. G, r S.r;rLo+rt't (Series & Phase) Drainage çl¿ss R-et99r{ D(L. -Field observations confirm Yes €ù manoed tvoe? Profile Description Depth (inches) Horizon Matrix color (lr4unsell moist) Mottle colors (Munsell moist) Mottle abundance size & contrast Texture, concretions, structure, etc. Drawing of soil profile (match description) )-lo ô -l ¡o¡¡g-'-ll C-----_., \---C^o , SR¡¡orr hn. \ Þ-+'ì ¿, ß \'vÞ{ 13 ¿, €flturbib+n Eydric Soit Indicators: (check all that apply) Histosol Histic Epipedon Sulfidic Odor Aquic Moisture Regime Reducing Conditions Gleved or Low-Chroma (=l) matrix Matrix chroma < 2 with mottles Mg or Fe Concretions -High Organic Content in Surface Layer of Sandy Soils Organic Streaking in SandY Soils Listed on NationaVlocal Hydric Soils List Other (explaln i Ilydric soils present? Rationale for decision/Remarks : yes éÐ lJÐ l\10U-a eor.u* Wetland Determination (circle) Hydrophyti c vegetation present? Hydric soils present? Wetland hvdrolocv oresent? yes yes Yes Is the sampling point within a wetland? ves L_y Rationale/Remarks: -<--.-) FJ Ò 'Yon-, KerA Múî€12{ . NOTES: Revised 4/97 DÄTA FORM I (Revised) Routine Wetland Determination (WA State TVetland Delineation Manual or 1987 Wetland Manual Date: 1-ro -oq Countlfikúß*f.ex) St¿te: \n/-A Project/site: \júvr^ C-r.rr.-rr-t , Çr:¡lorc¡u9 --T'9{p9 ' (4;¡trØ? Applicant/ownel: æ \l¿\-h4. Cas-.,oa, %>u-er;¡r'-3 Community D: ¿' Transect D: ---prot ID: gç_ I €rê Do Normal Circumstances exist on the site? ls tþe site significantly disturbed (atypical situation)? Is tùre area a potential Problem A¡ea? VEGETATION (For strata, indicateT =tree; S =sh¡ub; H= herb; V : vine) ÓF V7\-* Zinant Plant Snecies Stratum Yo cover Indicator Dominant ptant Species Stratum ø HYDROPHYTIC VEGETATION INDICfRS: %o of dominants OBL, FACW, & FAC Í /Check all indicators that apply & explain below: Visual observation of plant species growing in areas of prolonged inundation/saturation Physiological/reproductive adaptations S/etland plant database Personal knowledge of regional plant communities Hydrophytic vegetation present? Rationale for decisionlRemarks: L)Ð =-f, AP-€AP-€Ço-eP-u-ÉnE¡-t ls it the growing seaso42 soil temp (record temP ) other Iüy'ater Marks: Yes no Sediment Deposits: yes no Dept. of inundation: Oxidized Root (live roots) Local Soil Survey: yes no Depth to free water in pit: inches inohes to saturated soil: inches FAC Neutral: Yes no Vy'ater-stained Leaves Yes no Check all that apply & explain below: Stream, Lake or. gage data: \iletland hydrology present? Rationale for decision/Remarks : ¡Jo t\_ibÞ-Y lNÞ\'cfliÞès Y SOILS Map Unit Name \rc-r¿¡zuüt 02,ãcr'\-orrr'a Drainage "tutt Eg'€!¿-\"r,\ ÞÈ. (Series & Phase) Field observations confirm Yes Ð TProfile Description Depth (inphes¡ Horizon Matrix color O4unsell moist) Mottle colors (Munsell moist) Mottle abundance size & contrast Texture, concretions, structure, etc. Drawing of soil profile (match description) b-to Á \o,rP-41 -'-2 d^ . -Slru¡u l¿nnn lD-lþ ts wì,r41> --'" r-Ç,-Ç*$rau lørq) v Ilydric Soil Indicators: (check all that apply) Histosol Histic Epipedon Sulfidic Odor Matrix chroma < 2 with mottles Mg or Fe Concretions Hign Organic Content in Surface Layer of Sandy Soils Gleved õr low-Chroma (=1¡rutn* Other (explain in remarks) Ilydric soils present? Yes (@-) Rationale for decision/Remarks : Wetland Determination (circle) Hydrophytic vegetation present? Hydric soils present? Wetland hvdrolow present? Rationale/Remarks: ¡fo yes yes no \\ no I \ Is the sampling Point no' I withinawetland? ves ò ffiMsrqs,, NOTES: Revised 4/97 DA,TÄ FORM t (Revised) Routine Wetland Determination (WA State \iletland Delineation Manual or 1987 Wetland tion Date: e-ro-øq Counryîftúß*f,P¡J State: \^lA S/T/R: Project/Site: Núvr.^ C¡rr-."¡-¿ . Çr-rrc¡ou9 --Tß{p9, lfttsffiþ Applicant/ownel: æ \le\-¡4, C-os¡,¡a , =ú!-ue¿tLË Community lD:. ,--TpralonsteIcDt D:#t --U Do Normal Circumstances exist on the site? Is tþe site significantly disturbed (atypical situation)? Is the area a potential Problem Area? Exolanation of awoical or oroblem area: VEGETATION (Forstrata,indicateT=tree;S=shrub;H=herb;V=vine) '-,CA,='A Þç\-rU 4ZDominant plant Soecies Stratum o/o c,oyêr Indicator Dominant Plant Species , Stratum , 7o cover re\rB'{e9 s)r9C-Dtâ€ Check all indicators that apply & explain below: Visual observation of plant species growing in areas of prolonged inundatio¡/saturation Morphological adaptations Technical Literature Physiological/reproduotive adaptations Wetland plant database Personal knowledge of regional plant communities HYDROPHYTIC VEGETATION INDICATORS: 7o of dominants OBL, FACW, & FAC Hydrophytic vegetation present? yes Rationale for decisionlRemarks : !-lo 9P, t¡"-a& u)errfle0-\ Based on: soil temp (record temP ) Sediment Deposits: Yes no Dept. of inundation: Oxidized Root (live roots) Local Soil Survey: Yes no Depth to free water in pit: inches inches inches FAC Neutral: Yes no Check allthat apply & explain below: Stream, Lake or gage data: Wetland hydrology present? Rationale for decision/Remarks: N-Ð H 1C*æ\.oat cúz-truÞr,c-Ñ-È>É-S ' SOILS C"aaù Map Unit Name Mc-E+a¡r*nlgr tr LaA¡¿ Drainage ç¡¿ss îc¡ao.r-\ sç+ I "¡ ê> Field observations confirm Yes No (Series & Phase) Taxonom ,) Profile Descriotion Depth (iryhes) Horizon Matrix color (Munsell moist) Mottle colors Qr4unsell moist) Mottle abundance size &, contrast Texture, concretions, structure, etc. Drawing of soil profile lmatch descriotion) o'\b A ^t touf-Lh ? .5{¡.lsul-o*,t-¡ Ilydric Soil Indicators: (check all that apply) Histosol Histic Epipedon Sulfidic Odor Aquic Moisture Regime Reducing Conditions Gleved or Low-Chroma (=l) matrix Matrix chroma l2 with mottles Mg or Fe Concretions High Organic Content in Surface Layer of Sandy Soils Organic Streaking in SandY Soils Listed on National/Local Hydric Soils List Other (exPlain in remarks) Ilydric soils present? Rationale for decision/Remarks : yes @Wetland Determination (circle) Hydrophytic vegetation present? Hydric soils present? Wetland hvdroloc¡r oresent? yes' yes yes ls the sampling point within a wetland? yes @) Rationale/Remarks: \)o ?.s, \} Þa,-t6rvrL,J NOTES: Revised 4/9? 15 Appendix #5. Wetland Mitigation Guidelines. Guideline For Compensation Mitigation Ratios* Compensation acreage depends on the category of the wetland impacted and the category of wetland to be created. WSDOT agrees to a no net loss policy. The type of mitigation proposed, and past history of creating or restoring these types of wetlands, will be taken into account when determining appropriate ratios for the project. Wetlands dominated by exotic species (>80%), or out of kind mitigation, will be negotiated on a case-by-case basis. IMPACT TYPE OF MITIGATION*'! Wetland Cateeorv Restoration and Creation Cat II Cat III I 4:1, 6:1. II 2:1. 3:1 m 1 -1..5:1 1..5 -2:I ry .75 -1,.25:\ 1 -1.5:L Enhancement Enhancement of existing wetlands as compensation for the filling of other wetlands is an available option in some circumstances. Enhancement is the augmentation, or increase, of the functions and values of an existing wetland by direct action. If enhancement of existing wetland is proposed, the ratios are greater greater than those used for restoration and creation of wetlands, since the wetland already provides some level of functions and values and a net loss of acreage will occur. Because of this, mitigation ratios for enhancement are generally twice that of ratios for restoration/creation. These ratios are only a guideline, the greater the increase in wetland functions and values provided by the enhancement, the lower the ratio can be. In some circumstances/enhancement of other aquatic resources and functions, such as stream or riparian areas, may be acceptable. In these instances, ratios will be negotiated on a caseby-case basis. Preservation Preservation may be used to reduce the ratios above for restoration and creation to a minimum of L:1, and enhancement to a minimum of 2:L, as follows: Yelm Community Schools Proposed Transportation Center September 2009 Iletland Analysis Report T6 o The balance of the area required to meet the ratio in the above table is met by creating or enhancing a buffer around the mitigation site at a ratio of 5:L, or by preserving an existing buffer at a ratio of 10:1. For example, if the balance of the area required to meet the ratio is L acre, WSDOT can create a 5 acre buffer around the mitigation site. o The balance of the area required to meet the ratio in the above table can be met by preserving a Category I wetland at a ratio of 5:L or a Category II wetland at a ratio of 1,0:1, that is functionally linked (by habitat or hydrology) with the mitigation site in the same watershed. For example, if the balance of the area required to meet the ratio is L acre, WSDOT can preserve a 5 acre Category I wetland. The highest priority should be given to creating and preserving buffers around mitigation sites. (Any preservation that is not on, or adjacent to, a mitigation site will be allowed only if adequate buffers are provided at the mitigation site.) * From the July 'J.,lgg3,Implementing Agreement between The Washington State Department of Transportation and The Washington State Department of Ecology Concerning Wetlands Protection and Management (Appendix E). ¡T)T Mitigation type is specified in the wetland mitigation plan. Yelm Community Schools Proposed Transportation Center September 2009 l( et I an d Ana lys is Report YELM COMMUNITY SCHOOLS BUS TRANSFER STATION Preliminary Drainage and Erosion Control Report Proponent: Prepared By: Submitted: Yelm Community Schools Erling Birkland P.O. Box 476 Yelm, WA 98597 Phone: (360) 458-6128 Fax: (360) 458-6434 Trent J. Lougheed, P.E. Jerome W. Morrissette & Associates Inc., P.S. 1700 Cooper Point Road SW, #82 Olympia, WA 98502 (360) 352-9456 September,2009 Yelm Community Schools -Bus Transfer Station Drainage and Erosion Control Report JWM&A #05102 il. TABLE OF CONTENTS DRAINAGE REPORT Section 1 -Project Description Section 2 -Existing Conditions Section 3 -lnfiltration Rate/Soils Report Section 4 -Wells Section 5 -FuelTanks Section 6 -Subbasin Description Section 7 -100 year Flood Section I -Aesthetic Considerations Section g -Downstream Analysis Section 10 -Covenants, Dediôations, and Easements Section 11 -Articles of lncorporation EROSION CONTROL REPORT Section 1 -Sequence Section 2 -Trapping Sediment Section 3 -Permanent Erosion Control Section 4 -Geotechnical Report Section 5 -lnspection section 6 -control of pollutants other than sediment APPENDIX 11222234444556666 ilt. A. B. c. D. E. Soils lnformation Hydraulic Analysis commercial stormwater Faci tities Maintenance Ag reement Engineer's Construction lnspection Report Form Thurston Region Stormwater Facilities Summary Yelm Community Schools -Bus Transfer Station ?Fl19g" and Erosion Control Report JWM&A #05102 PROJECT ENGINEER'S CERTIFICATE 'I HEREBY CERTIFY THAT THIS PROJECT, YELM COMMUNITY SCHOOLS -B9SJRANSFER STAT|ON, THURSTOITI COU BEEN PREPARED BY ME OR UNDER MY SUPERVISION AND MEETS MINIMUM STANDARDS OF THURSTON COUNTY AND NORMAL STANDARDS OF ENGINEERING PRACTICE. I UNDERSTAND THAT THE JURISDICTION DOES NOT AND WILL NOT ASSUME LIABILITY FOR THE SUFFICIENCY, SUITABILITY, OR PERFORMANCE OF DRAINAGE FACILITIES DESIGNED BY ME." Jerome W. Morrissette & Associates lnc., p.S. qlzs lat #wffi S;jäl"-*4 Yelm Community Schools -Bus Transfer Station Dlainage and Erosion Control Report JWM&A #05102 YELM COMMUNITY SCHOOLS -BUS TRANSFER STATION CIVIL SITE IMPROVEMENTS THURSTON COUNTY, WASHINGTON STORM DRAINAGE AND EROSION CONTROL REPORT PART I. DRAINAGE REPORT This report has been prepared as part of the Subdivision requirements for the subject site and in accordance with the "Drainage Design and Erosion Control Manualfor Thurston Region, Washington" 1994. Section I -Project Description: The Yelm Community Schools -Bus Transfer Station project consists of expansion of an existing asphalt parking lot, and partial building removal to provide additional area for asphalt parking with associated stormwater system expansion. The total site is approximately 8.84 acres. The site is located on the north side of Stevens Avenue between Edwards Street and the Railroad Right of-Way Yelm, Washington, in Section nineteen (19), Township seventeen (17) North, Range two (2) West. The property to be developed consists of the following assessor's tax parcel number(s): 1) 22719310100 2) 22719310300 3) 22719310301 4) 22719310200 Site access will be via one existing entrance off of Stevens Avenue. The entrance is located north of the intersection of Stevens Avenue and Railroad Street. The overall project will involve the demolition of approximately 28,082 square feet of buildings and construction of approximately 70,799 square feet of asphalt pavement. The stormwater system will sheet flow the stormwater across the pavement areas, which will then collect and treaUconvey the stormwater through biofiltration swales. The stormwater will then be discharged to an infiltration pond (or gallery) on the western end of the site. No stormwater will be discharged from this pond. The 1O0-Year overflow will be provided by simply sheetflowing to the north to Yelm Creek. The stormwater system has been designed to meet the standards of the Thurston County Stormwater Manual. Yelm Community Schools -Bus Transfer Station Drainage and Erosion Control Report JWM&A #05102 Section 2 -Existing Conditions: The existing site consists of numerous existing building and paved areas with some pasture to the west and north. The remaining area to the north is the Yelm Creek with associated wetlands The site, measuring approximately 598'x 690'x575'x604', slopes down from the south(west) property line to the northeast to Yelm Creek with an elevation change from 340 feet to 325 feet. Section 3 -lnfiltration Rates/Soils Report: Soils on the site are listed in the Soil Conservation Service's Soil Survey of Thurston County Washington as Spanaway gravelly (stony) sandy loam, 0 to 3 percent slopes, with some isolated McKenna gravelly silt loam down by Yelm Creek. Spanaway soils typically include a surface layer of 6 to 15 inches of black gravelly sandy loam over a dark brown extremely gravelly/stony sand to depths of over 20 feet. Permeability is rapid. Available water capacity is low; runoff is slow and the hazard of water erosion is slight. The soil mapping from this soil survey indicates that the predominant soil group at this site is "4". An evaluation of the surficial soils was conducted, and a copy of the soils logs are located in Appendix A. The soil logs in the area of the stormwater infiltration gallery or pond confirm the soil survey mapping of this area. There was no evidence of high ground water in any of the soil pits. lnfiltration tests have not been conducted at the site, but will be conducted for final design, Based on infiltration tests conducted in the area in similar soils, it is expected to have rates well above 100 inches per hour. Preliminary sizing has assumed a design infiltration rate of 20 inches per hour. Section 4 -Wells: There are no existing wells at this project site. Section 5 -FuelTanks: No fueltanks exist on the site. Section 6 -Subbasin Description: The is no offsite runoff tributary to this site as the ROW on the uphill side of the project has its own drainage system. Section 7 -100 Year Flood: Yelm Community Schools -Bus Transfer Station Drainage and Erosion Control Report JWM&A #05102 The. impacts of the proposed development on stormwater runoff have been analyzed in accordance with the procedure described in the ,,Drainage Design and Erosion control Manual for Thurston Region, washington,', 1ggã. All stormwater conveyance and infirtration systems have beeñ sized to accommodate the 100 Year -24 Hour Design Event. All stormwater treatment systems will be designed for the 6 Month -áq Hour Design Event as ou¡ined in the Thurstol C^gunty Stormwater Manual. The hydraulic änalysis for the on-site stormwater facilities can be found in Appendix B. lh.e gyqtuation performed inctudes the HyDRA anatyses (HYDRA version 5.85, July 1994). Copies of.the. HYDRA lnput and outputiiles ànd tables summarizing the site area and pond vorume characteristics are included in Àtú;ãi, B. -"-"'= POST DEVELOPMENT SITE CHARACTERISTICS Total Site Area Pass-Through Drainage Area Ex. lmpervious Tributary Area (1) New lmpervious Tributary Area Pervious Tributary Area Undeveloped Area (not tributary) SCS Data Hydrologic Soil Group,,A,' Curve Numbers lmpervious Areas gg Disturbed pervious Areas 6g Notes: (1) lmpervious Tributary Area includes the asphart pavement, sidewalk, and buildings tributary to existing infiltration galler. SYSTEM MINIMUM REQUIREMENTS Required Detention Pond volume: cf (per Hydra w/Manual min.) cf (minimum per Manual) 0 cfs 0 cfs 100o/o @20 inlhr Svstem Performance Within the subject site, stormwater runoff from all dísturbed land surfaces will sheet flow across the pavement areas, which willthen collect and treat/convey the stormwater through biofiltration swales. The stormwater will then be discharged to an infiltration pond or gallery expansion on the northwest porrtion of the site. Yelm Community Schools -Bus Transfer Station Q¡a]190e and Erosion Controt Report JWM&A #05102 8.837 Acres 0.000 Acres 3.560 Acres 0.980 Acres 0.110 Acres 4.187 Acres Release Rates Qmin (6 mo.) Qmax (100 yr.) Required lnfiltration Based on the HYDRA analyses performed for the 100 Year -24 Hour Event, the peak flow entering the infiltration pond will be cfs. All stormwater runoff from the development of this site will be infiltrated, with an emergency overflow being sheet flow down to Yelm Creek. Section I -Aesthetic Considerations: ln general, the site improvements will be consistent with those for fire stations. Consequently, the overall aesthetic affect of the stormwater facilities on this site ' will be consistent with, if not more pleasing than, neighboring areas and should not detract from surrounding areas. Section 9 -Downstream Analysis: No downstream analysis will be required for this project since all stormwater runoff generated from the developed site will be infiltrated (no release). Section l0 -Covenants, Dedications, Easements: Operation and maintenance of the stormwater system will be the responsibility of Yelm Community Schools. A commercial stormwater facilities maintenance agreement prepared for this development is located in Appendix C. Section I I -Articles of lncorporation: This site is being developed by governmental agencies, so no añicles of incorporation are required. Yelm Community Schools -Bus Transfer Station Drainage and Erosion Control Report JWM&A #05102 PART II. EROSION CONTROL REPORT Section I -Sequence: The following is the construction sequence for construction of the site improvements: . 1. lnstall silt fences along the downhill side of all land disturbing activities as indicated on the erosion control plan. 2. Rough grade swale and pond (or gallery) for temporary stormwater facilities. 3. Grade areas to be paved. 4. Pave areas as indicated on the site plan. 5. Finish grade pond and finish grade, topsoil, fertilize, and seed biofiltration swale and other disturbed areas. 6. Once disturbed surfaces have developed suitable groundcover, remove perimeter silt fences. Section 2 -Trapping Sediment: The proposed grading of the site, as well as the construction of the items listed below, will mitigate against any major diversion of stormwater runoff by maíntaining natural drainage patterns. The structural components of the erosion control plan willwork in combination with temporary and permanent soil stabilization efforts to minimize the amount of sediment-laden runoff entering adjacent properties and Yelm Creek. Measures. Taken to Control Sediment: Stabilized Construction Entrance at all points of egress during the construction of the civil site improvements. Filter Fabric Silt Fences located down-slope of all eañhwork that may pose a potential of releasing sediment laden water. Permanent sediment trapping will be accomplished in the underground pretreatment and primary treatment devices. lf a substantial amount of soil is being deposited on Stevens Avenue due to truck traffic, the road will immediately be cleaned of all debris and further preventative measures will be taken to ensure the problem ceases, such as establishing a tire wash down area. All of the above features of the Erosion and Sedimentation Control Plan, if installed and periodically maintained, are expected to minimize the potential for sediment-laden runoff escaping the site and entering the downstream environment during and after the construction of the project. Yelm Community Schools -Bus Transfer Station Drainage and Erosion Control Report JWM&A #05102 Section 3 -Permanent Erosion Control: The following measures will be taken for soil stabilization to minimize the amount of sediment-laden runoff entering adjacent properties. Stabilization of cut and fill areas with hydroseeding and, if necessary, chopped hay mulching (or jute matting) on areas downstream from the roadside swales that are disturbed during construction. Permanent erosion control on this site will be accomplished through the development of grass groundcover on all unpaved disturbed areas. Section 4 -Geotechnical Report: There are no incipiently unstable stormwater related conditions within the project site; hence, no additional soil investigations or analyses are planned. Due to the very high infiltration rates of these soils and the high factor of safety utilized in the design, no additional infiltration tests will be required after the construction of the stormwater facilities. Section 5 -lnspection: The construction of stormwater facilities on the subject site will be monitored by the Owner and the Owner's representative in accordance with the requirements of the Drainage Manual. The following is the recommended inspection sequence for the construction of stormwater facilities described above: 1. At completion of rough grading. 2. At completion of paving, fine grading, fertilizing, seeding, and mulching. Upon completion of the project, the "Engineer's Construction lnspection Report Form" will be completed by the licensed Professional Engineer responsible for providing the above listed inspection services and submitted to Thurston County. Section 6 -Control of Pollutants Other Than Sediments: As the subject site development will consist of non-residential use, it will most likely not involve the storage or use of non-sediment pollutants on this site. Temporary pollutant sources, such as cement truck wash-down waste, fuel spillage during equipment refueling, and construction waste materials may develop for short periods during the construction of the roadways, utilities, stormwater facilities and fire station. Care will be taken to minimize the adverse impacts of these conditions. Activities such as concrete truck wash-down and equipment refueling will be Yelm Community Schools -Bus Transfer Station Drainage and Erosion Control Report JWM&A #05102 carried out in the viciníty of building construction, at least 50 feet from the stormwater facilities and 100 feet from the well. Construction materialstockpile areas should be limited to the immediate vicinity of the structures being constructed. Bulk petrochemical storage, in the form of gasoline, fuel, oil, lubricants, and other such hazardous fluids will not be permitted on thís site. Yelm Community Schools -Bus Transfer Station Drainage and Erosion Control Report JWM&A #05102 APPENDIX A Soils lnformation Yelm Community Schools -Bus Transfer Station Drainage and Erosion Control Report JWM&A #05102 .. t' .iij , .r, h,,i,o tt 1I i .! ' j . tli¡ rlFEE .ì. ¡ ..\ \ .\ Joíhs insr s _.¡ u . tt'r,' '-noøf . .toc 1ló,'' .:. #ç\; -{' ^ 4 a ,¿ ;-:l*¡ ld' 'f ' ¡ '-*.'J \ W.'r l rc Ì-r' ¡ t '; "' l*lt I tlrg{ *ilï {'.f' Soil Survey 56 Newberg soils on natural levees' lncluded areas make up about '.l5 percent of the total acreage' Permeability is moderately slow in the Maytown soil' Available water capacity is high' Effective rooting depth is 60 inches or more. A seasonal high water table is at a Oeptn of 30 to 40 inches from November to April' Runoff is slow. and the hazard of water erosion is slçht. This soil is occasionally flooded for brief periods from November to APril. Most areas of this unit are used for hayland' pasture' or cropland. A few areas are used for homesites or woodland, This unit is well suited to hay and pasture' The main limitations are the seasonal high water table and the natãtO of flooding. Grasses and legumes grow well if fertilizer is applied' Grazing when the soil is wet damages the plants and results in compaction of the surtacä layer. Rotation grazing helps to maintain the quality of íorage. Periodic mowing helps to maintain un¡toim growtñ, discourages selective grazing' and controls leeds. Animal manure can be applied periodically during the growing season' Areas that iece¡ve neãvy apþlications should be harrowed at least once a year. ln most years irrigation is needed for maximum production' Sprinkler irrigation is the best method of aPPlYing water. Sweet corn, corn silage, peas, and small grain are commonly grown on this soil. The main limitations åffecting tróptanC are the seasonal high water table ãnd the-hazard of flooding. Channeling and deposition are common along streambanks' Flooding can be controlled by dikes and levees' Applying animal manure and returning crop residue to the soil help to maintain the organic matter content, fertility, and tilth' A cover àråp s"noutO be planted in the fall to protect the soil from erosion during periods of flooding' ln most years irr'ijation is nðeded for maximum production' Sprinkler irrigation is the best method of applying water' in¡s un¡t is suited to woodland' On the basis of a 1OO-year site curve, the mean site index for Douglas-fir is l6b. On the basis of a 5O-year site curve' it is 120' The estimated growth rate for an unmanaged' evenaged stand of Douglas-fir is 170 cubic feet per acre per year at 65 Years of age. The main lim¡tation affecting the harvesting of timber is the muddiness causêd by seasonal wetness' Use of wheeled and tracked equipment when the soil is wet results in ruts and soil compaction' Unsurfaced roads and skid trails are soft and can be impassable when *ei. Logging roads require suitable surfacing material for yeariiouñd use' Rock for road construction is not r.ruáity available on this unit. Disturbance of the protective layer of duff can be minimized by the careful use of wheeied and tracked equipment' --êeeOting establishment is the main concern in the productioriof timber' Reforestation can be ãccã*plisned by planting Douglas-fir.seedlings' lf the stanO lncluOes seed trees, natural reforestation by red áiJ., o..rt. readily in cutover areas' The occasional flooding inhibits root respiration and thus results in some seedling mortality-When openings are made in in. ."nopy, iÑading biushy plants can prevent the establishment of planted Douglas-fir seedlings' Because ine rooting depth is restricted by the seasonal high water table, trees are subiect to occasional windthrow' The main limitation affecting homesites is the hazard of flooding. Dikes and channels that have outlets for floodwatei can be used to protect buildings and onsite sewage disposal systems from flooding' Roads and street-s should be built above the expected flood level' The main limitations affecting septic tank absorption fields are the hazard of flooding, the seasonal wetness' and the moderately slow permeability' The moderately ilo* p"rrn.ability and the high water table increase the likelihood that the septic tank system will fail' Backfilling the trench with sandy material and installing long ànsorption lines help to compensate for the moderately slow PermeabilitY. This map unit is in capability subclass llw' 65-McKenna gravelly silt loam, 0 to 5 percent stopes. This moderately deep, poo-rly drained soil is in ã"ji".rion. and drainageways' lt formed in glacial drift' ine nat¡ve vegetation iJmainly hardwoods' Elevation is 50 to 500 feet. The average annual precipitation is 45 to 55 inches, the average annual air temperature is about áó O"gr."t F, and thl average frost-free period is 150 to 1 80 daYs. Typicaliy, the surface is covered with a mat of leaves anO i*igs âOout e inches thick' The surface layer is Otact gr-auelly silt loam about 9 inches thick' The upper + inchés of tñe subsoil is very dark grayish brown gravelly silt loam, the next I inches is dark brown very iravetly silt loam' and the lower 15 inches is dark brown ãnO Oarx yellowish brown, mottled very gravelly loam' The substratum to a depth of 60 inches or more is grayish brown, dense glacialtill' which crushes to very Iraíetty loam. Depth to the glacial till ranges from 20 to 40 inches. lncluded in this unit are small areas of Alderwood and Kapowsin soils on till plains, Bellingham and Norma soils in depressions, and Everett and Skipopa soils on terraces. lncluded areas make up about ',l0 percent of the total acreage. n County, Washington is moderate above the dense glacial till McKenna soil and very slow through the till. water capacity is moderate. Effective rooting i is about 20 lo 40 inches. A perched seasonal table is near or above the surface from ber to April. Runoff is ponded or very slow, and zard o'f water erosion is slight. areas of this unit are used as woodland. A few are used for haY and Pasture. alder is the main woodland species on lhis unit. the trees of limited extent are western redcedar rn hemlock. On the basis of a SO-year site . the mean site index for red alder is 90. The growth rate of an unmanaged, even-aged 'of red alder is 101 cubic feet per acre per year at s of age. main limitation affecting the harvesting of timber muddiness caused by seasonal wetness. Use of and tracked equipment when the soil is wet in ruts and soil compaction. Unsurfaced roads id trails are soft and can be impassable when ing roads require suitable surfacing material -round use. Rock for road construction is not available available on this unit. The seasonal high water the ponding limit the use of equipment to dry . Disturbance of the protective layer of duff can mized by the careful use of wheeled and tracked ling mortality is the main concern in the of timber. Reforestation can be ished by planting western redcedar seedlings. lf includes seed trees, natural reforestation by occurs readily in cutover areas. The high table and the ponding inhibit root respiration and It in high seedling mortality. When openings in the canopy, invading brushy plants can the establishment of planted western redcedar hgs. Because the rooting depth is restricted by water table, trees are subject to frequent 0w. forest understory plants are salmonberry, b, vine maple, trailing blackberry, and sedges. main limitations affecting hay and pasture are h water table and the ponding. Wetness limits of plants and the period of cutting or grazing the risk of winterkill. Grazing should be until the soil has drained sufficiently and is firm to withstand trampling by livestock. Grazing soil is wet damages the plants and results in of the surface layer. Subsurface drains, ains, or both can lower the water table if a outlet is available. Periodic mowing helps to 57 maintain uniform growth, discourages selective grazing, and controls weeds. Animal manure can be applied periodically during the growing season. Areas that receive heavy applications should be harrowed at least once a year. This map unit is in capability subclass Vlw. 66-Melbourne silty clay loam, 5 to 20 percent slopes. This deep, well drained soil is on uplands. lt formed in residuum derived dominantly from highly weathered marine siltstone. The native vegetation is mainly conifers and hardwoods. Elevation is 200 to 600 feet. The average annual precipitation is 45 to 60 inches, the average annual air temperature is about 50 degrees F, and the average frost-free period is 150 to 200 days. Typically, the surface layer is dark brown silty clay loam about 11 inches thick. The upper 43 inches of the subsoil is dark brown silty clay loam, and the lower part to a depth of 60 inches or more is brown clay loam. lncluded in this unit are small areas of Centralia soils on uplands, Galvin soils on alluvial fans, Prather and Salkum soils on broad uplands, and Scamman soils on terraces. Also included are small areas of Melbourne silty clay loam that have slopes of 20 to 40 percent. lncluded areas make up about 20 percent of the total acreage. Permeability is moderately slow in the Melbourne soil. Available water capacity is high. Effective rooting depth is 40 to 60 inches. Runoff is slow, and the hazard of water erosion is slight. This unit is used mainly for woodland. lt is also used for homesites. Douglas-fir is the main woodland species on this unit. Among the trees of limited extent are red alder, western redcedar, western hemlock, and bigleaf maple. On the basis of a 100-year site curve, the mean site index is 175 Íor Douglas-fir. On the basis of a 50-year site curve, it is 132 for Douglas-fir and 98 for red alder. The highest average growth rate of an unmanaged, evenaged stand is 186 cubic feet per acre per year at 60' years of age for Douglas-fir and 115 cubic feet per acre per year at 40 years of age for red alder. The main limitation affecting the harvesting of timber is the muddiness caused by seasonal wetness. Use of wheeled and tracked equipment when the soil is wet results in ruts and soil compaction. Unsurfaced roads and skid trails are soft and sticky and can be impassable when wet. Logging roads require suitable surfacing material for year-round use. Rock for road construction is not readily available on this unit. Disturbance of the protective layer of dutf can be i permeability is moderately rapid in the Spana soil. iAvailable water capacity is moderate. Effective rooting ideptn ¡s 20lo 40 inches. A seasonal high water table is iat a deptn of about 12 to 36 inches from November to rfipril. Runoff is slow, and the hazard of water erosion is 'sligMhto, st areas are used as hayland and pasture. This unit is suited to hay and pasture. The main limitations rare the seasonal high water table and the moderate 'available water capacity. Proper stocking rates, pasture rotation, and restricted grazing during wet periods help Ito Xeep the pasture in good condition and protect the ;soil from erosion. Rotation grazing helps to maintain the quality of forage. Periodic mowing helps to maintain uniform growth, discourages selective grazing, and controls weeds. ln most years irrigation is needed for 'maximum production. Sprinkler irrigation is the best method of applying water. The amount of water applied should be sufficient to wet the root zone but small enough to minimize the leaching of plant nutrients. A few areas are used as woodland. On the basis of a r100-year site curve, the estimated site index for Douglas-fir is 144, On the basis of a 5O-year site curve, it is '110. The estimated growth rate of an unmanaged, leven-aged stand of Douglas-fir is '150 cubic feet per :acre per year at 60 years of age. I The main limitation affecting the harvesting of timber is the muddiness caused by seasonal wetness. Use of ,wheeled and tracked equipment when the soil is wet results in ruts and soil compaction. Unsurfaced roads and skid trails are soft and can be impassable when wet, Logging roads require suitable surfacing material ,for year-round use. Rounded pebbles and cobbles for ioad construction are readily available on this unit. The Seasonal high water table limits the use of equipment to ,dry periods. Disturbance of the protective layer of duff can be minimized by the careful use of wheeled and lracked equipment. : Seedling establishment is the main concern in the production of timber. timber. Fìeforestation can be accomplished by planting Douglas-fir seedlings. lf the stand includes seed trees, natural reforestation by red alder occurs periodically in cutover areas, The seasonal þigh water table inhibits root respiration and thus results B9 This map unit is in capability subclass lllw. 110-Spanaway gravelly sandy loam, 0 to 3 percent slopes. This very deep, somewhat excessively drained soil is on terraces. lt formed in glacial outwash and volcanic ash. The native vegetation is mainly grasses, ferns, and a few conifers. Elevation is 100 to 400 feet. The average annual precipitation is 45 to 55 inches, the average annual air temperature is about 51 degrees F, and the average frost-free period is 150 to 200 days. Typically, the surface layer is black gravelly sandy loam about 15 inches thick, The subsoil is dark yellowish brown very gravelly loam about 5 inches thick. The substratum to a depth of 60 inches or more is dark yellowish brown extremely gravelly sand. lncluded in this unit are small areas of Alderwood soils on till plains; Everett, lndianola, and Nisqually soils on outwash terraces; and Spana soils in depressions. Also included are small areas of Spanaway soils that have a stony sandy loam surface layer and small areas of Spanaway gravelly sandy loam that have slopes of 3 to 15 percent. lncluded areas make up about 20 percent of the total acreage. Permeability is moderately rapid in the subsoil of the Spanaway soil and very rapid in the substratum. Available water capacity is low. Effective rooting depth is 60 inches or more. Runoff is slow, and the hazard of water erosion is slight. This unit is used mainly as hayland, pasture, or cropland, as a site for homes, or as a source of gravel. It is also used as woodland. The main limitation affecting hay and pasture is the low available water capacity. Proper grazing practices, weed control, and fertilizer are needed to ensure maximum quality of forage. Rotation grazing helps to maintain the quality of forage. Periodic mowing helps to maintain uniform growth, discourages selective grazing, and controls weeds. Animal manure can be applied periodically during the growing season. Areas that receive heavy applications should be harrowed at least once a year, ln summer, irrigation is needed for maximum production of most forage crops. Sprinkler irrigation is the best method of applying water. The amount of water applied should be sufficient to wet the root zone but small enough to minimize the leaching of plant nutrients. This unit is suited to crops, Wheat, oats, strawberries, raspberries, blackberries, and sweet corn are commonly grown. The main limitation is the low available water capacity. ln summer, irrigation is needed for maximum production of most crops. fn some seedling mortality. When openings are made in Ithne canopy, invading brushy plants can prevent the Iþ stab-ti-s' nment of ppllaanntteedd Dougqlas-fir seedlingqs. I Common forest understory plants are cascade pregon-grape, salal, vine maple, western brackenfern, änO Orelon white o ak.90 Sprinklers can be used, but a slow application rate is needed to minimize runoff. The amount of water applied should be sufficient to wet the root zone but small enough to minimize the leaching of plant nutrients. The application rate should be adjusted to the available water capacity, the water intake rate, and the needs of the crop. Animal manure can be applied periodically during the growing season. Areas that receive heavy applications should be harrowed at least once a year. This unit is well suited to homesites. Pebbles and cobbles should be removed, particularly in areas used for lawns. ln summer, irrigation is needed for lawn grasses, shrubs, vines, shade trees, and ornamental trees. Mulch, fertilizer, and irrigation are needed to establish lawn grasses and other small-seeded plants. The main limitation affecting septic tank absorption fields is a poor filtering capacity. lf the density of housing is moderate or high, community sewage systems are needed to prevent the contamination of water supplies caused by seepage from onsite sewage disposal systems. Cutbanks are not stable and are subject to sloughing. Douglas-fir is the main woodland species on this unit. Among the trees of limited extent are Oregon white oak, lodgepole pine, and red alder. Douglas-fir and Scotch pine are grown on Christmas tree plantations. On the basis of a 100-year site curve, the mean site index for Douglas-fir is 140. On the basis of a S0-year site curve, it is 108. The highest average growth rate of an unmanaged, even-aged stand of Douglas-fir is 145 cubic fèet per acre per year at 65 years of age. This soil is suited to year-round logging. Unsurfaced roads and skid trails are slippery when wet. Logging roads require suitable surfacing material for year-round use. Fìounded pebbles and cobbles for road construction are readily available on this unit. Disturbance of the protective layer of duff can be minimized by the careful use of wheeled and tracked equipment. Seedling establishment and seedl¡ng mortality are the main main concerns in the production of timber. Reforestation can be accomplished by planting Douglas-fir seedlings. lf the stand includes seed trees, natural reforestation by Douglas-fir, Oregon white oak, and lodgepole pine . occurs periodically in cutover areaS. Droughtiness in the sudace layer reduces the seedling survival rate. When openings are made in the canopy, invading brushy plants can delay the establishment of planted Douglasfir seedlings Common forest understory plants are cascade Oregon-grape, salal, western brackenfern, western swordfern, lndian plum, and Scotch-broom. Soil Surv This map unit is in capability subclass lVs. 111-Spanaway gravelly sandy loam, 3 to 15 percent slopes. This very deep, somewhat excessi' drained soil is on terraces. lt formed in glacial outwr and volcanic ash. The native vegetation is mainly grasses, ferns, and a few conifers. Elevation is '100 400 feet. The average annual precipitation is 45 to { inches, the average annual air temperature is about degrees F, and the average frost-free period is 150 200 days. Typically, the surface layer is black gravelly sand loam about 15 inches thick. The subsoil is dark yellowish brown very gravelly sandy loam about 5 inches thick. The substratum to a depth of 60 incher more is dark yellowish brown extremely gravelly sar lncluded in this unit are small areas of Alderwood soils on till plains and Everett, lndianola, and Nisque soils on terraces. Also included are small areas of Spanaway soils that have a stony sandy loam surfar layer and small areas of Spanaway gravelly sandy k that have slopes of 0 to 3 percent. lncluded areas n up about 20 percent of the total acreage. Permeability is moderately rapid in the subsoil of Spanaway soil and very rapid in the substratum. Available water capacity is low. Effective rooting dep is 60 inches or more. Runoff is slow, and the hazard water erosion is slight. This unit is used mainly as hayland or pasture, as site for homes, or as a source of gravel, lt is also us as woodland. The main limitation affecting hay and pasture is tl' low available water capac¡ty during the growing seas Proper grazing practices, weed control, and fertilizer needed to ensure maximum quality of forage, Rotatir grazing helps to maintain the quality of forage. Perio mowing helps to maintain uniform growth, discouragr selective grazing, and controls weeds. Animal manul can be applied periodically during the growing seaso Areas that receive heavy applications should be harrowed at least once a year. ln summer, irrigation needed for maximum production of most forage crop Sprinkler irrígation is the best method of applying wa The amount of water applied should be sufficient to r the root zone but small enough to minimize the leacl of plant nutrients. This unit is suited to homesites. The main limitatio is the slope. Cutbanks are not stable and are subject sloughing. A plant cover can be established and maíntained through proper fertilizing, seeding, mulchi and shaping of the slopes. Pebbles and cobbles shor be removed, particularly particularly in areas used for lawns. ln rI II;ftrurston CountY, Washington ,rrrrr, irrigation is needed for lawn grasses, shrubs, vines, shade trees, and ornamental trees. Mulch, lerlilizer, and irrigation are needed to establish lawn orasses and other small-seeded plants. Topsoil can be ãtockpiled and used to reclaim areas disturbed during construction' The main limitation affecting septic tank absorption fields is a poor filtering capacity in the substratum. lf the density of housing is moderate or high, community sewage systems are needed to prevent the contamination of water supplies caused by seepage from onsite sewage disposal systems. The slope hinders the installation of the absorption fields. Absorption lines should be installed on the contour. Douglas-fir is the main woodland species on this unit. Among the trees of limited extent are Oregon white oak, lodgepole pine, and red alder. Douglas-fir and Scotch pine are grown on Christmas tree plantations. On the basis of a 1O0-year site curve, the mean site index for Douglas-fir is 140. On the basis of a SO-year site curve, il is 108. The highest average growth rate of an unmanaged, even-aged stand of Douglas-fir is 145 cubic feet per acre per year at 65 years of age. This soil is suited to year-round logging. Unsurfaced roads and skid trails are slippery when wet. Logging roads require suitable surfacing material for year-round use. Rounded pebbles and cobbles for road construction are readily available on thís unit. Disturbance of the protective layer of duff can be minimized by the careful use of wheeled and tracked aquipment. Seedling establishment and seedling mortality are the nain concerns in the production of timber. Reforestation :an be accomplished by planting Douglas-fir seedlings. I the stand includes seed trees, natural reforestation of :utover areas by Oregon white oak and lodgepole pine )ccurs infrequently. Droughtiness in the surface layer 'educes the seedling survival rate. When openings are nade in the canopy, invading brushy plants can delay :he establishment of planted Douglas-fir seedlings. Common forest understory plants are cascade )regon-grape, salal, western brackenfern, western ;wordfern, lndian plum, and Scotch-broom. This map unit is in capability subclass lVs. 112-spanaway stony sandy toam, 0 to 3 percent llopes. This very deep, somewhat excessively drained ;oil is on terraces. lt formed in glacial outwash and ¡olcanic ash. The native vegetation is mainly grasses, erns, and a few conifers. Elevation is 200 to 400 feet. ihe average annual precipitation is 40 to 50 inches, the ¡verage annual air temperature is about 51 degrees F, 91 and the average frost-free period is 150 to 200 days. Typically, the surface layer is black stony sandy loam about 16 inches thick. The subsoil is very dark brown gravelly sandy loam about 6 inches thick. The substratum to a depth of 60 inches or more is grayish brown extremely gravelly sand. lncluded in this unit are small areas of Alderwood soils on till plains, Baldhill soils on terminal moraines, and Everett, lndíanola, and Nisqually soils on terraces. Also included are small areas of Spanaway soils that have a gravelly sandy loam surface layer and small areas of Spanaway stony sandy loam that have slopes of 3 to 15 percent. lncluded areas make up about 15 percent of the total acreage. Permeability is moderately rapid in the subsoil of the Spanaway soil and very rapid in the substratum. Available water capacity is low. Effective rooting depth is 60 inches or more. Runoff is slow, and the hazard of water erosion is slight. This unit is used mainly for hayland, pasture, or homesites. The main limitations affecting hay and pasture are the low available water capacity and the stones on the surface. Proper grazing practices, weed control, and fertilizer are needed to ensure maximum quality of forage. Rotation grazing helps to maintain the quality of the forage, Because of the surface stones, spreading animal manure, mowing, and seeding are difficult. ln summer, irrigation is needed for maximum production of most forage crops. Sprinkler irrigation irrigation is the best method of applying water. The amount of water applied should be sufficient to wet the root zone but small enough to minimize the leaching of plant nutrients. This unit is well suited to homesites. Pebbles, cobbles, and stones should be removed, particularly in areas used for lawns. ln summer, irrigation is needed for lawn grasses, shrubs, vines, shade trees, and ornamental trees, Mulch, fertilizer, and irrigation are needed to establish lawn grasses and other smallseeded plants. Cutbanks are not stable and are subject to sloughing. The main limitation affecting septic tank absorption fields is a poor filtering capacity in the substratum. lf the density of housing is moderate or high, community sewage systems are needed to prevent the contamination of water supplies caused by seepage from onsite sewage dlsposal systems. This map unit is in capability subclass lVs. 113-Spanaway stony sandy loam, 3 to 15 percent slopes. This very deep, somewhat excessively drained soil is on terraces. lt lt formed in glacial outwash and 92 volcanic ash. The native vegetat¡on is mainly grasses, ferns, and a few conifers. Elevation is 200 to 400 feet' The average annual precipitation is 40 to 50 inches, the average annual air temperature is about 51 degrees F' and the average frost-free period is 150 to 200 days' Typically, the surface layer is black stony sandy loam about '16 inches thick. The subsoil is very dark brown gravelly sandy loam about 6 inches thick. The substratum to a depth of 60 inches or more is grayish brown extremely gravelly sand. lncluded in this unit are small areas of Alderwood soils on till plains, Everett, lndianola, and Nisqually soils on terraces, and Baldhill soils on terminal moraines. Also included are small areas of Spanaway soils that have a gravelly sandy loam surface layer and small areas of Spanaway stony sandy loam that have slopes of 0 to 3 percent. lncluded areas make up about 15 percent of the total acreage. Permeability is moderately rapid in the subsoil of the Spanaway soil and very rapid in the substratum. Available water capacity is low. Effective rooting depth is 60 inches or more. Runoff is slow, and the hazard of water erosion is slight. This unit is used mainly for hayland, pasture, or homesites. The main limitations affecting hay and pasture are the low available water capacity and the stones on the surface. Proper grazing practices, weed control, and fertilizer are needed to ensure maximum quality of forage. Rotation grazing helps to maintain the quality of the forage. Because of the surface stones, spreading animal manure, mowing, and seeding are difficult. ln summer, irrigation is needed for maximum production of most forage crops. Sprinkler irrigation is the best method of applying water. The amount of water applied should be sufficient to wet the root zone but small enough to minimize the leaching of plant nutrients. This unit is well suited to homesites, The main limitation is the slope. Cutbanks are not stable and are subject to sloughing. A plant cover can be established and maintained through proper fertilizing, seeding, mulching, and shaping of the slopes. Pebbles, cobbles' and stones should be removed, particularly in areas used for lawns. ln summer, irrigation is needed for lawn grasses, shrubs, vines, shade trees, and ornamental trees. Mulch, fertilizer, and irrigation are needed to establish lawn grasses and other small-seeded plants. Topsoil can be stockpiled and used to reclaim areas disturbed during construction. The main limitation affecting septic tank absorption fields is a poor filtering capacity in the substratum. lf the density of housing is moderate or high, community Soil Survey sewage systems are needed to prevent the contamination of water supplies caused by seepage from onsite sewage disposal systems. The slope hinders the installation of the absorption fields. Absorption lines should be installed on the contour' This map unit is in capability subclass lVs. 114-Spanaway-Nisqually complex, 2 to 10 percent slopes. This map unit is on mounds and in areas between mounds. The mounds are circular or elliptical, and they are 3 to 5 feet high in the center (fig.3). The native vegetation is mainly grasses and ferns. Elevation is 100 to 250 feet. The average annual precipitation is 45 to 55 inches, the average annual air temperature is about 51 degrees F, and the average frost-free period is 1 50 to 200 daYs. This unit is 60 percent Spanaway gravelly sandy loam, which has a slope of 2 to 5 percent, and 30 percent Nisqually loamy fine sand, which has a slope of 2 to 10 percent. The components of this unit are so intricately intermingled that it was not practical to map them separately at the scale used. The Spanaway soil is very deep and somewhat excessively drained. lt formed in gravelly glacial outwash and volcanic ash. Typically, the surface layer is black gravelly sandy loam about 15 inches thick. The subsoil is dark yellowish brown very gravelly sandy loam about 5 inches thick. The substratum to a depth of 60 inches or more is dark yellowish brown extremely gravelly sand. Permeability is moderately rapid in the subsoil of the Spanaway soil and very rapid in the substratum. Available waler capacity is low. Effective rooting depth is 60 inches or more. Runoff is slow, and the hazard of water erosion is slight. The Nisqually soil is deep and somewhat excessively drained. lt formed in sandy glacial outwash' Typically' the upper part of the surface layer is black and very dark gray loamy fine sand about '18 inches thick, and the lower part is very dark grayish brown loamy fine sand about 13 inches thick. The substratum to a depth of 60 inches or more is light olive brown loamy sand' Permeability is moderately rapid in the surface layer of the Nisqually soil and very rapid in the substratum' Available water capacity is moderate. Effective rooting depth is 60 inches or more. Runoff is slow, and the hazard of water erosion is slight. lncluded in this unit are small areas of Everett and lndianola soils on terraces. lncluded areas make up about 1 0 percent of the total acreage. This unit is used used for hayland, pasture, or homesites' ln the areas used for hay and pasture, the main Thurston County, Washington Soil name and map symbol 110r 111--------Spanaway Il2, rr3-Spanaway 114*: Spanalray------Depth Clay Permeabil ity rni II o-221 22-261 26-38 38-60 |II o-rs I 1s-20 | 20-60lII o-16 | L6-22|| 22-60l O-s IIII o-rs I 1s-20 | 20-6OlII 0-5 I s-3r I 3 1-60 | TÀBIE 15.--PHYSICÀL ÀND CHEIIICAL PROPERTIES OF T1IE SOILS--Continued on I factors II 273 I| 0rganic I matter I t 5-15 5-15 3-10 5-10 10-20 5-10 5-10 Àvailable water capacity ttI soir I shrink-swell I reaction I potential tt II o-11 | 11-36 | 36-40 | 40-60 |I I o-1r. I 11-sol 50-60 |II 0-10 | 10-15 I ls-48 ! 48i II o-11 | rr-47 | 47-60lIIII IIII 0-8 I 8-46 | 46-60 II I 0-5 10-15 '9:lu 2-ro 10-25 25-35 18-3s 0-5 2.0-6.O 2.0-6.0 2 .0-6 .0 6.0-20 2.0-6.O 2.0-6.0 >20 2 .0-6 .0 2.0-6.O >20 2.0-6.O 2 .0-6.0 >20 2.0-6.O 2.0-6.0 >20 0.6-2.0 0.6-2.O o.6-2.0 0.2-0.6 0. 2-0.6 0.6-2.0 o'9:3'o >20 0.6-2.0 0.2-0.6 0.6-2.O 0.6-2 . 0 0.6-2.O o'!:3'o o.6-2.O 0.6-2.0 o.6-2.O 0. r2-0. 14 0.14-0.17 0.09-0.12 0.05-0.08 0. L1-0.13 0.09-0.12 0.03-0.05 0.1 1-0. 13 0. 09-0. 1 2 0 . 03-0. 05 0.11-0.13 0.09-0.12 0.03 -0.05 0.09-0.12 0.08-0. r2 0.04-0.07 0.18-0.20 0.18-0.20 0.2 5-0.35 0.20-0.30 0.19-0.21 0.12-0. t4 0.12-0.14 0.06-0. 07 0.25-0.35 0.25-0.35 0.30-0.40 0.2s-0.35 0.25-0.35 0.20-0.30 0.17-0.20 0.1 2-0. I 7 0. 15-0.20 7-I5 5-15 5-15 2-5 0-5 5 .6-6.0 5.6-6.0 5.6-6.0 5.6-6.0 5.1-6.0 5. L-6 .5 6.1-7 .3 5.1-6.0 5.1-6.5 6.1-7.3 5 . 1-6.0 5.1-6.5 6.r-7 .3 5 .6-6.5 5.6-6.5 6.r-7 .3 6.L-7.3 lLow------------i 0.37i 6.1-7.3 lModerate-------| o.sz I ttlrll 3.6-5.5 ll,ow------------I o.ze ¡ 3.6-s.s lrcw------------| 0.32 | 3.6-5.0 lModerate-------| o.sz I 5.1-6.0 u'l:9'o 5.1-6.0 5.6-7 .3 5.6-7.3 5.6-7 .3 5.1-6.0 s.1-6.0 u'1_1'o 5 . 1-6.0 5.1-6.0 5.1-6.0 I s.o-o.s I 5.6-6.s lLow------------i 0.32 5.6-6.5 lLow------------| o.ro Nisqual ly------115 Sul tan 116-------------Tacoma 117r 118,119---Tenino 120-------Tisch r21, r22--------Vailton L23 t r24---Wilkeson r25. Xerorthents 126, r27, I28---Yelm 0-5 0-5 0-5 II o-7 I 1s-20 7-601 20-30 II 0-7 | s-18 7-s0 I s-18 s0-601 20-s0 2.0-6.0 2.0-6.0 6.0-20 0.25-0.35 0.15-0.25 0.04-0.09 ttt ttllll | ¡,ow------------! 0.24 | I Lor.¡------------i o. r7 I I low------------i 0.10 | I Low------------i 0.0s I ttt tll I Low------------| o.ls I ! ¡,ow------------i 0.101 I l,ow------------! o.02 | ltt ¡ll I Low------------| o. 1s I ! low------------| o.10 I lLow------------i o.oz ¡ trltl t ttt tll I Low------------| 0.15 | I Low------------i 0.10 i I Low------------I o.oz ¡ tll tll I Low------------| o.2o i I low------------i o. 28 | I r,ow------------| 0.24 I trltl t * See description of the rnap unit for composition and behavior characteristics of the map unit. ,Fnñ/ñÆ&A ferome W. Morrissette & Associates lnc., p.S. 1700 Cooper Point Road SW #B-2, Olympia, WA 98502-1llO (360)3s2_9456 /FAX (360)352_9990 Soil Boring Log Project Number: 0 B r¿ Z Project Name: yrr^ -i-r¿au... t, -.^r¡lge Eg4qg Number: t t-OCatiOn: Yçr_¡.. -Íeax r. l.¡^.+n.è Date: òy.lb. oq Ê^,t-*u^* år. à t.tn\rr:.NrL Arrs Contractor: Yeu..' Loon*ur\rtrv \.-"", . Total Depth of Hole: E' RigType: 3it Gn trvaluauon UOnOUCted EV: f-o, ä -I Project Engineer: TRev, :_o.Jr,".r,ÊEc> Method of Excavation: Ro. * _^--DEPTH COLOR SoilDescription ù -'-:-" l)qre* lèeor.n s¡ Oreb>¡.rrt flrrFç (,-oose) L'-?' t¡ e^ t^ f cçegd åao*rè à (recúa! { Ê,}¡r( Itooj{L*r,-=¡ '2'-^'.to* Lrrê*.a i'ger.rt , fnrìie'a , Lae{ig täo.a.^ru,-uY 1 lÁ.pçyn¿¡t-¡ -i.. f-,r,¡eTri t'ao-',r¡ (. Lc.se) q'. ¡,r'-q I LRçc, f.nrq€.f^.$i *;a f3ourct,cs \^t I laña¿,.e1 à J,nt.n.. 'T.o t,grreiu \*,¡¡f: (t-.,r>srq\ E!!!!!!9!!!S t./o Ev,oe*r¿e. O f: Geoo¡¡o*raf eR Civil /Municipal /Geotechnicat Engineering and ptanning #wftÆ&A ferome W. Morrissette & Associates tnc., P.S. Soil Boring Log Project Number: obr42 ProjectName: Yr"* îirn<s. (..¡ru-..c Boring Number: 2 Location: Yç1...r, T.ec¡+q. ¡.,., sÊ+ec Date: oy .lta -Òq R¡rr-reo,r o ßt . 9 ßr cve ¡rs. Av e Contractor! Yu.n". t_rrmmo* r.,q \, -...^, . Total Depth of Hole: \ o Rig Type: ê1o (n Evaluation Conducted By: 'í, u c.3. Proiect Engineeri Treo*r Lor.'.xscn Method of Excavation! Baex "'ae DEPTH COLOR Soil Description f)¡er,. Beo-¡¡ O QtnÀ¡ltr flve ¡-{'-1'2" Geo.-/.aea-¡ 5o"" to å t¡o¿ove, '+Jl Veer, L,r'tc r-.. (è.L r (L r'{'-r'å' iãau "-{arrrl:¡ è ¿..ãq.var lt,^osr} I g" * '¿t^t 14..or.,r.n [?r,¡u,nr Frlws To Mar>rurn 9¡¡¡¡: ä tsre avc.ú--i VBer," Lr'¡r¡g-$,ut I ?oots St,rp '. ( r-rr-rr, ,^ (r"+o^,..-o\ 2ta,"'4'r^;" GÈa-r^-Lr,-"'r"Re^., r (¡ r¿ou6r-3 OôÊÉ1,rfy1 Sa¡v O ,-r^J I l-af¿t* g L og€t nc ,t LLrt¡llcLu \gû\Oarc Èc\ ?."^t" \û 1ì¡.4ã 1R¿"r*'^,^.t Vra., Ye¡,¡c,n Loe.,a Comments: No Ev, eet.lr.¿ O¡-i.crÞ.-,.-ÊL".ror¡r,l 1700 Cooper Point Road SW, #B-2, Olympia, WA WA 98502-1 .t 10 (360)352-9456 /FAX (360)352_9990 (8) Civil /Municipal /Geotechnical Engineeing and planning ,Frnnnm&A Jerome W. Morrissetle & Assocíates lnc., p.S. 1700 Cooper Point Road SW, #B-2, Otympia, WA 98502-1 i 10 (360)352-9456 /FAX (360)352_9990 Soil Boring Log Project Number: Ògr42 ProjectName: Y^gu* iean¡t. L.ar¡rr,î Boríng Number: 3 Location: Yar."., Tcesr.g, L,r.*r.l .r¿ Date: 01 -ur -ôê1 fè¡t,-¿*¿.c tr. 3 (cr,r..^it À.r Contractor! Ysr.cñ t_orn¡cirrur.ru Scqcr.rl.. Total Depth of Hole: q ' Rig Type: lro u, Evaluation Condu"ted By: t. u . g C,L ProjectEngineer: -f***, Lrr*..,eeo Method of Excavation: ß^.ns* DEPTH COLOR Soil Description o ''-3" D ¡Þ t B e,o*¡ ".¡ OA<¡rrvtc Õt¡erc 2" -z-,t f)acc f3c¿r,or V uer^ S^*o* Loo* r.-r I tsreor.¡¿, , ?,'-ã,t,-" ( (+s Ì ße* Looge ob-aç¡o 3 (¡nev¿l \;¡t Èo.r.y Lratçu C^" -á, 14 eo,.¡rn Reo-^,tr¿ totue t fs,e".rg w:/¡ç^e,*¿ S.rrv,"S @!0G. ño Eu,oo*.n ôc Ge*rro w^rÉ(å LË.} Civil /Municipal /Geotechnical Engineeríng and planning ,Frrunm&A ferome W. Mo¡rissette & Associates lnc., p.S. 1 700 Cooper Point Road SW, #B-2, Olympia, WA 98502-1 I .l O (360)352-9456 /FAX (360)352-e990 Soil Boring Log ProjectNumber: Ògr42 P--r-ot--ie ct Name: v-, IELê^ tÈ¿.rr( I','-,a¿-a Boring Number: + Location: Yeu-.Tñn-rç f *..-*-. Date: O'r. rb -oâ I?¡.trrz*aè. 4.* b q-k..-,.À-r( Â.,-Gontractor! ysurn {-o--,r^, iq¡, (., -,--, .. Total Depth of Hole: g. , ¿ Rig Type: ? r r¡ t+ Evaluation Gonducted By: -r . ¡. ! ¿,q , Project Engineer: J-ou n. r*orr*", uuo Method of Excavatio!:_E¿sÉ_LorE DEPTH COLOR Soil Description a,',_ 2,, Daec ße-o*rc O esra".rt,-f)vç .-4'-2.'a.'l l¿Lt f4H r '.áÊ-,-."r Cu,¿ a* A**rc, ä LneavEr ', €>m( -r ¡ ßtrrt¡<yr Or I ? tÅ,"-q r loo ^--Ctro-, So.*o å froorr' r¡/Aro*s b C-^ate,í comments: ruo EvroÊs¡cÈ ôg (ro-*.1 ôJ^.r^r^al}Ê Civ¡l /Municipal /Geotechnical Engineering and planning sEc. 19, T.17 MROUUAlÊ FtøwE EuosrL2aE6ûYu ,O'AUæ \ 2Ø' seúE Lw^@dir EUñe zNE \ /t/t' \\ CAL *NC fMK \-K 227t9Jr02@¡. \. tì.., r\ nRI Þsnd6 au¡Drxc Z/,"'/4Á,7 #Ë\*,*""o","'*u-. X \. -r. ^ . -tt e uyrrr,r'or* /\ \rp.r_ #4 \. ,, \ ,wi l*-''' e s.L. * /1 ./l ,'l "/a(t' /\ q asnuc\¡o^o Jerome W. Morrissette & Associates lnc., P.S. l700CooperPl.Road5.W.#B-2,Olympia,Wa.98502-lll0 Ph360.352.9456 Fx360.352.9990 APPENDIX B Hydraulic Analysis Yelm Community Schools -Bus Transfer Station Drainage and Erosion Control Report JWM&A #05102 APPENDIX C Gommercial Stormwater Facilities Maintenance Agreement Yelm Community Schools -Bus Transfer Station Drainage and Erosion Control Report JWM&A #05102 l0 COMMERCIAL/INDUSTRIAL AGREEMENT TO MAINTAIN STORMWATER FACILITIES AND TO ¡MPLEMENT A POLLUTION SOURCE CONTROL PLAN BY AND BETWEEN YELM COMMUNITY SCHOOLS ITS HEIRS, SUCCESSORS, OR ASSIGNS The upkeep and maintenance of stormwater facilities and the implementation of pollution source control best management practices (BMPs) is essentialto the protection of water resources. All property owners are expected to conduct business in a manner that promotes environmental protection. This Agreement contains specific provisions with respect to maintenance of stormwater facilities and use of pollution source control BMPs. LEGAL DESCRIPTION: Tax Parcel No.: 22719310100 22719310300 22719310301 22719310200 Address: 40214041406 Railroad Street NW Yelm, WA 98597 Whereas, Yelm Community Schools -Bus Transfer Station has constructed improvements, including but not limited to, buildings, pavement, utilities and stormwater facilities on the property described above. ln order to further the goals of the Jurisdiction and to ensure ensure the protection and enhancement of water resources, the Jurisdiction and Yelm Communitv Schools -Bus Transfer Station hereby enter into this Agreement. The responsibilities of each party to this Agreement are identified below. YELM COMMUNITY SCHOOLS SHALL: (1) lmplement the stormwater facility maintenance program included herein as Attachment "4". (2) lmplement the pollution source control program included herein as Attachment "8". Yelm Community Schools -Bus Transfer Station Drainage and Erosion Control Report JWM&A #05102 ll (3) Maintain a record (in the form of a log book) of steps taken to implement the programs referenced in (1) and (2) above. The log book shall be available for inspection by Jurisdiction staff at Bus Transfer Station (40214041406 Railroad Street NW) during normal business hours. The log book shall catalog the action taken, who took it, when it was done, how it was done, and any problems encountered or follow-on actions recommended. Maintenance items ("problems") listed in Attachment "A" shall be inspected on a monthly or more frequent basis as necessary. Yelm Community Schools -Bus Transfer Station is encouraged to photocopy the individual checklists in Attachment "4" and use them to complete its inspections. These completed checklists would then, in combination, comprise the monthly log book. (4) Submit an annual report to the Jurisdiction regarding implementation of the programs referenced in (1) and (2) above. The report must be submitted on or before May 15 of each calendar year and shall contain, at a minimum, the following: (a) Name, address and telephone number of the businesses, the persons, or the firms responsible for plan implementation, and the person completing the report. (b) Time period covered by the report. (c) A chronological summary of activities conducted to implement the programs referenced in (1) and (2) above. A photocopy of the applicable sections of the log book, with any additional explanation needed, shall normally suffice. For any activities conducted by paid parties not affiliated with Yelm Communitlr Schools -Bus Transfer Station, include a copy of the invoice for services. (d) An outline of planned activities for the next year. THE JURISDICTION SHALL: (1) Provide technical assistance to Yelm Community Schools -Bus Transfer Station in support of its operation and maintenance activities conducted pursuant to its maintenance and source control programs. Said assistance shall be provided upon request, and as Jurisdiction time and resources permit, at no charge to Yelm Communitv Schools -Bus Transfer Station. (2) Review the annual report and conduct a minimum of one (1) site visít per year to discuss performance and problems with Yélm Communitv Schools -Bus Transfer Station. Yelm CommuniÇ Schools -Bus Transfer Station Draina$e and Erosion Control Report JWM&A #05102 t2 (3) Review this agreement with Yelm Communitv Schools -Bus Transfer Station and modify it as necessary at least once every three (3) years. REMEDIES: (1) lf the Jurisdiction determines that maintenance or repair work is required to be done to the stormwater facilities existing at Yelm Communitv Schools -Bus Transfer Station property, the Jurisdiction shall give the owner of the propeÍy within which the drainage facility is located, and the person or agent in control of said property, notice of the specific maintenance and/or repair required. The Jurisdiction shall set a reasonable time in which such work is to be completed by the persons who were given notice. lf the above required maintenance and/or repair is not completed within the time set by the Jurisdiction, written notice will be sent to the persons who were given notice stating the Jurisdiction's intention to pefform such maintenance and bill the owner for all incurred expenses. The Jurisdiction may also revoke stormwater utility rate credits for the quality component or invoke surcharges to the quantity component of Yelm Community Schools -Bus Transfer Station bill if required maintenance is not performed. lf at any time the Jurisdiction determines that the existing system creates any imminent threat to public health or welfare, the Jurisdiction may take immediate measures to remedy said threat. No notice to the persons listed in Remedies (1), above, shall be required under such circumstances. The owner grants unrestricted authority to the Jurisdiction for access to any and all stormwater system features for the purpose of peforming maintenance or repair as may become necessary under Remedies 1 andlor 2. The persons listed in (1), above, shall assume all responsibility for the cost of any maintenance and for repairs to the stormwater facility. Such responsibility shall include reimbursement to the Jurisdiction within 30 days of the receipt of the invoice for any such work performed. Overdue payments will require payment of interest at the current legal rate for liquidated judgments. lf legal action ensues, any cost or fees incurred by the Jurisdiction will be borne by the parties responsible for said reimbursements. The owner hereby grants to the Jurisdiction a lien against the abovedescribed property in an amount equal to the cost incurred by the Jurisdiction to perform the maintenance or repair work described herein. (2) (3) (4) (5) Yelm Community Schools -Bus Transfer Station Drainage and Erosion Control Report JWM&A #05102 l3 This Agreement is intended to protect the value and desirability of the real property described above and to benefít all the citizens of the Jurisdiction. lt shall run with the land and be binding on all parties having or acquiring from Yelm Communitv Schools -Bus Transfer Station or their successors any rights, title, or interest in the property or any part thereof, as well as their title, or interest in the property or any part thereof, as well as their heirs, successors, and assigns. They shall inure to the benefit of each present or future successor in interest of said property or any part thereof, or interest therein, and to the benefit of all citizens of the Jurisdiction. Owner Owner ))SS couNTY oF THURSTON ) On this day and year personally appeared before and known to be the individual(s) described, and who executed the foregoing instrument and acknowledge the said instrument to be the free and voluntary act and deed for the uses and purposes therein mentioned. Given under my hand and official seal this _ day of 200 Dated at 200 Notary Public in and for the State of Washington, residing in Washington, this day of _, Yelm Community Schools -Bus Transfer Station Drainage and Erosion Control Report JWM&A #05102 t4 STATE OF WASHINGTON COUNTY OF THURSTON On this day and year personally appeared before who executed the foregoing instrument and acknowledge the said instrument to be the free and voluntary act and deed of said Municipal Corporation for the uses and purposes therein mentioned and on oath states he is authorized to execute the said instrument. Given under my hand and official sealthis day of Notary Public in and for the State of Washington, residing in APPROVED AS TO FORM: ))ss ) 200 Yelm Community Schools -Bus Transfer Station Drainage and Erosion Control Report JWM&A #05102 l5 INSTRUCTIONS FOR PERSON MAINTAINING STORMWATER SYSTEM The following pages describe the maintenance needs of the stormwater conveyance, storage and disposal components of the system designed for this site. This maintenance effort shall be the responsibility of the Yelm Community Schools -Bus Transfer Station or its assigned representative. ln general, system components should be inspected in accordance with the Maintenance Checklists included as Attachmerìt "A" at the rear of this document. Use the suggested frequency indicated on the left side of the Checklist Forms: (1) Monthly (M) from November through April (2) Annually (A), once in late summer (preferably September) (3) After major storm events (S)tt inch in 24 hours. lnspection findings should be recorded on photocopies of Maintenance Checklist forms. Checkoff the problems you looked for each time an inspection was performed. Maintenance should be undertaken to correct deficiencies found and comments on problems found and actions taken entered on the forms. Completed Checklist Forms should be filed and incorporated in the annual report to be issued in May of each year. lf you have specific questions or require technical assistance, contact the responsible jurisdiction. Please do not hesitate to call, especially if you are unsure whether a situation you have discovered may be a problem. Yelm Community Schools -Bus Transfer Station Drainage and Erosion Control Report JWM&A #05102 t6 ATTACHMENT "4": MAINTENANCE PROGRAM COVER SHEET Number of Sheets Attached: lnspection Period: Date lnspected: Name of lnspector: Inspector's Signature: Yelm Community Schools -Bus Transfer Station Drainage and Erosion Control Report JWM&A #05102 17 ATTACHMENTS A & B STORMWATER MAINTENANCE AGREEMENT WITH ACCOMPANYING STORMWATER FACILITY MAINTENANCE GUIDE & POLLUTION SOURCE CONTROL PROGRAM YELM COMMUN¡TY SCHOOLS -BUS TRANSFER STATION September,2009 Yelm Community Schools -Bus Transfer Station Drainage and Erosion Control Report JWM&A #05102 l8 ATTACHMENT "A'-STORMWATER FACILITY MAINTENANCE GUIDE INTRODUCTION What is Stormwater Runoff? When urban and suburban development covers the land with buildings, streets and parking lots, much of the native topsoil, duff, trees, shrubs and grass are replaced by asphalt and concrete. Rainfall that would have soaked directly into the ground instead stays on the surface as stormwater runoff making its way into storm drains (including man-made pipes, ditches, or swale networks), stormwater ponds, surface and groundwater, and eventually to Puget Sound. What is a Storm Drain System and how does it work? The storm drain system for most sites includes components that carry, store, cleanse, and release or infiltrafe the stormwater. These components work together to reduce the impacts of development on the environment. These impacts can include flooding which results in property damage and blocked emergency routes, erosion which can cause damage to salmon spawning habitat, and pollution whích harms fish and/or drinking water supplies. The storm drain system provides a safe method to carry stormwater to the treatment and storage area. Swales and ponds filter pollutants from the stormwater by physical/y settling out particles, chemícally binding pollutants to pond sediments, and biologically converting pollutants to less-harmful compounds. Ponds also store treated water, releasing it gradually to a nearby stream or to groundwater. What does Stormwater Runoff have to do with Water Quality? Stormwater runoff needs to be treated because it carries litter, oil, gasoline, fertilizers, pesticides, pet wastes, sediments, and anything else that can float, dissolve or be swept along by moving water. Left untreated, polluted stormwater can reach nearby watenruays where it can harm and even kill aquatic life. lt can also pollute groundwater to the extent that it must be treated before it can be used for drinking. Nationally, stormwater is recognized as a major threat to water quality. Remember to keep everything out of stormwater systems except the rainwater they are designed to collect. Your Stormwater Facility Different types of ponds are designed for ditferent purposes. For example, wet ponds primarily provide treatment of stormwater. Dry ponds or infiltration ponds are designed to provide storage for stormwater and gradually release it downstream or allow it to filter into the ground. Yelm Community Schools -Bus Transfer Station Drainage and Erosion Control Report JWM&A #05102 l9 Who is Responsible for Maintaining Stormwater Facilities? All stormwater facilities need to be maintained. Regular maintenance ensures proper functioning and keeps the facility visually appealing. This Stormwater Facility Maintenance Guide was designed to help explain how stormwater facilities work and provide user-friendly, straightfonruard guidance on how to maintain them. You are responsible for regularly maintaining privately owned ponds, catch basins, pipes and other drainage facilities on your property. Stormwater facilities located in public right-of-ways are maintained by local governments. How to Use the Stormwater Facility Maintenance Guide This Maintenance Guide includes a Site Plan specific to your development and a Facility Key that identifies the private stormwater facilities you are responsible for maintaining. A "Quick List" of maintenance activities has also been included to help you identify the more routine needs of your facility. This Guide lncludes: A comprehensive Maintenance Checklist Checklist that provides specific details on required maintenance; A section on Pollution Prevention Tips that lists ways to protect water quality and keep storm drain systems functioning smoothly; And a section on Resources that directs you to sources of more information and technical assistance. A Regional Approach to Stormwater Management The cities and towns of the Puget Sound and Western Washington are taking steps to educate and involve area residents in water quality issues and stormwater management. Stormwater runoff is a widespread cause of water quality impairment and stream degradation. The jurisdictions are working together with residents, businesses, community groups and schools to address this problem. This Guide focuses on providing information on ways that your business can reduce stormwater impacts through pollution prevention and proper facility maintenance. Everyone needs to help keep wateruays and groundwater clean. With proper management and common sense, we can continue to enjoy clean, safe streams and drinking water. YOUR STORMWATER FACILITIES The stormwater facilities on your site is comprised of biofiltration strips, biofiltration swales, and an infiltration pond. Yelm Community Schools -Bus Transfer Station Drainage and Erosion Control Report JWM&A #05102 20 QUICK L¡ST The following list is an abbreviated checklist of the most common types of maintenance you should have to do. Please try and go over this checklist after heavy rains, This is a bare minimum and should be done in conjunction with the other checklists in order to make your maintenance program effective. o Check filter strip, swale and pond walls for erosion or caved in areas. o Check riprap (rocks) at the intersections of the swales and pond. MAINTENANCE CHECKLISTS The Maintenance Checklists in this packet are for you to use when checking the stormwater facilities on your property. This packet has been customized so that only the checklists for your facilities are included. lf you feel you are missing a checklist, or you have additional facilities not identified or addressed in this packet, please contact your local jurisdiction. The checklists are in tabular format for ease of use and brevity. Each checklist tells you what part of the feature to check, how often to check it, what to check for, and and what to do about it. Log sheets are included toward the end of the chapter to help you keep track of when you last surveyed the storm drainage system. A listing of resources is included in the next chapter. Here you will find the phone numbers of the agencies referred to in the tables, as well as the contractor and consultants that designed and constructed your facilities. Yelm Community Schools -Bus Transfer Station Drainage and Erosion Control Report JWM&A #05102 2t FENCTNG, SH RU BBERY SCR EENS, AN D GATES Fences and shrubbery screens aren't typically required for stormwater ponds. If the slopes of the sides are too steep, usually some kind of barricade is constructed. Pa¡t of Fencing, Shrubbery, or Gate to Check When to Check it Whatto Check For Whatto Do Fence or shrubbery screen Quarterly lnspect the fence or screen to ensure that it bloèks easv entrv to the facilitv. Make sure erosion haén't crêated an opehing under fence. Mend the fence, repair erosion, or replace the shrubs to forrh a solid banier. Shrubbery screen Quarterly Shrubbery should not be growing out of control or infesteZl with weeds Trim and weed shrubbery to orovide aooealino äestheticði Do nót use chemicals to conhol weeds. Wire Fences Annually Look alono the lenqth of the fence and determine-if it is ou-t of alignment. Straighten posts and rails if necessary. Wire Fences Annually Missing or loose tension wire. Reolece or reoair tension wirb so it holds fabric. Wire Fences Annually Missing or loose loose barbed wire. KeDlace or reÞatr Daroeo wirè so that it'doesn't sag between posts. Wire Fences Annually Check for rust or scaling. Paint or coat rustino or scalino oarts with d protecliüe coat¡ng. Wire Fences Quarterly Ensure that there are no holes in the fabric or fencing. Reoair holes so that there are'no open¡ngs in the fabric or lencrng. Gâte Quarterly Ensure that the oate is not broken. iammed. or missing and that-it opens easily. Reoair or reDlace the qate to all<iw entrv óf oeople alnd maintenañce equbment. lf a lock is used, make sure you have a key. Yelm Community Schools -Bus Transfer Station Drainage and Erosion Control Report JWM&A #05102 22 CATCH BAS//VS AND INLETS These structures are typically located in the streets and public rights-of-way. Local jurisdictions are responsible for routine maintenance of the pipes and catch basins in rights-of-way, while you are responsible for keeping the grates clear of debris in all areas as well as pipes and catch basins in private areas. Parf of Catch Basin to Check When to Check it What to Check For What to Do Catch basin opening During and after major storms Trash or debris accumulating in front of the catch basin opening and not allowing water to flow in. Remove blocking trash or debris with a rake and clean off the orete. Catch basin Quarterly Sediment or debris in the basin should be kept under 50% ofthe depth from the bottom ofthe pipe to the bottom of the basin. Use a long stick or broom handle to poke into sediment and determine deoth. Clean out the catch basin of sediment and debris, lnlet and outlet pipes Quarterly Trash or debris in the pipes should not be more than 1/5 of its height. Also, there should not be any tree roots or other vegetation qrowinq in the pipes. Clean out inlet and outlet pipes of trash or debris. lnlet and outlet pipe joints Annually There should be no cracks wider than % inch and longer than 1 foot at the joint of any inlet or outlet pipe. Also check for evidence of sediment entering the catch basin through cracks. Repair cracks or replace the joints. Grate Quarterly The grate should not have cracks longer than 2 inches. There should not be multiple cracks. Replace the grate. Frame Quarterly Ensure that the frame is sitting flush on top of the concrete structure (slab). A separation of more than % inch between the frame and the slab should be corrected. Repair or replace the frame so it is flush with the slab. Catch basin Annually lnspect the walls of the basin for cracks wider lhan/zinch and longer than 3 feet. Also check for any evidence of sediment entering the catch basin through cracks. Determine whether or not the structure is sound. Replace or repair the basin. Contact a professional engineer for evaluation. Catch basin Quarterly There should be no chemicals such as natural gas, oil, and gasoline in the catch basin. Check for obnoxious color, odor, or oily sludge. Clean out catch basin. Contact your local jurisdiction or Thurston County Environmental Health if you detect a color, odor, or oily sludge. OiltllVater separator (downturned elbow or "T" in catch basin) Quarterly Water surface in catch basin has sionificant sludge, oil, grease, or scum layer cõvering all or most of the water surface. Remove the catch basin lid and skim off oil laver. Pour oil into a disposable cdntainer, seal container, wrap securely in newspaper, and place in trash. Water surface should be clear of oily layer. Pipe Elbow Quarterly Top or bottom of pipe appears to have broken off. Check for any apparent damage and check to see if it's plumb. Remove the catch basin lid and examine the pipe for damage. lf broken, hire a contractor to reolace oioe in accordance with approved þlans on file with your local jurisdiction. Yelm Community Schools -Bus Transfer Station Drainage and Erosion Control Report JWM&A #05102 23 CoNVEYANCE 2IPES, DTTCHES, AND SWALES Part of Sysúem fo Check When to Check Ít Whatto Check For Whatto Do Pipes Annually Accumulated sediment should not exceed 20% of the diameter of the oioe. Veoetation should not reduce free moverhént of wãter throuoh oioes. Ensure thât the Drotective coetino'is not iiämaoed and rusted. Öents should notsignifiõantly impede flow. Pipe should not hâve maioi cracks or tears allowing water to leak out.' Clean out oioes of all sediment ånh debris. Remove all veoetation so that water flowé freelv through pipes. Repaìr or replace prpe. Open ditches Quarterly There should not be anv vard waste or litter in the ditch. Remove trash and debris and dispose of them properly. Open ditches Annually Accumulated sediment should not exceed 20o/o ofthe depth ofthe ditch. Clean out ditch of all sediment and debris. Oo' en ditches & Swales Annually Check for veoetetion (e.o.. weedv shrubs or saplings) thalreduced th-e'free mbvement of water through ditches or swales. Clear blockino veoetation veoetation so that water floús fÉelv throuoh ditches. Grássv vegetãtion should be left elone. Op' en ditches & Swales Quarterly Check around inlets and outlets for siqns of erosion. Check slooes for sions of slõuohino or settlinq. Action i3 needed'where erocfed -damageÏs over 2 inches deep and where there is potõntial for continued erosion. Eliminate causes of erosion. Stabilize slopes by using appropriate erosion control measures (e.9., reinforce with rock, plant grass, compact soil.) Op' en ditches & Swales Annually Native soil beneath the rock splash pad, check dam, or lining should not be vísible.' Replace rocks to design standard. Swales Quarterly Grass cover is sparse and weedy, or aÍeas are overgrown with woody vegetatioñ. Aerate soils and reseed and mulch bare areas. Keeo orass less than I incheè ñioh. Remove woodv g röwth, regrade, and'reseed as necessary. Swales Quarterly Swale has been filled in or blocked by shed, woodpile, shrubbery, etc. lf oossible. soeak with hcimeownér ånd reouest that the swale area be rèstored. Swales Annually Water stands in swale or flow velocity is very slow. Stagnation occurs. A survev mav be needed to check oiadeé. Grades need to be in-1-5% ranoe if oossible. lf oradãis less ihan 1%, unìlerdrains may need to be installed. Yelm Community Schools -Bus Transfer Station Drainage and Erosion Control Report JWM&A #05102 24 POIVDS There are essentially three kinds of ponds: treatment ponds, infiltration ponds, and detention ponds. Although each pond has unique maintenance requirements, there are also many things they have in common. Your facility is a detention pond. Part of Pond to Check When to Check it What to Check For Whatto Do Entire Pond Quarterly Dumping of yard wastes such as grass clippings and branches into basin. Presence of qlass. plastic. metal. foam. and coated oaoer. Remove trash and debris and dispose of properly. Entire Pond Quarterly Any vegetation that may constitute a hazard to the public, such as tansy ragwort, poison oak, st¡nging nettles, devilsclub. Remove invasive or noxious vegetation. Do not spray chemicals on vegetation without obtaining guidance from WSU Cooperat¡ve Extension and approval from the City or eôilnlv Entire Pond Quarterly Presence of chemicals such as natural gas, oil, and gasoline, obnoxious color, odor, or sludge. First, try and locate the source of the pollution. Then call the Moderate Risk Waste program at Thurston County Environmental Health to rcnnrt tha hazard Entire Pond Quarterly Sparse, weedy, or overgrown grass in grassy (dry/infiltration) ponds. Presence of invasive species or sparse growth of plants in wet ponds. Forgrassy ponds, selectively thatch, aerate, and re-seed ponds. Grass should be kept less than 8 inches high. Forwet ponds, hand-plant nursery-grown wetland plants in bare areas. Contact WSU Cooperative Extension for guidance on invasive species. Pond bottoms should have uniform dense coverage ofdesired plant species. Entire Pond Quarterly Any evidence of rodent holes if your facility is acting as a dam or berm. Water should not be able to flow throuoh rodent holes. Destroy rodents and repair the dam or berm. Contact the Thurston County Health Deoartment for ouidance. Entire Pond Quarterly lnsects such as wasps and hornets interfering with maintenance activities, or mosquitoes becominq a nuisance. Destroy or remove insects. Contact WSU Cooperative Extension for guidance. Entire Pond Annually Ensure that trees are not interfering with maintenance (i.e., mowing, silt removal, or acccce ì Prune tree limbs to allow for maintenance. Some trees may be cut for firewood. lnlet Annually MaKe sure Ìnat tne nDraD unoer tne rntel DrDe ¡s intact and that no nat¡ve soil is exposed. 'Also check for accumulations of sediment more than % the height of the rocks. Replace rocks or clean out sediment. Outlet Quarterly The rip rap overflow should be intact and clear of debris. Water should be able to flow freely lhrôr rdh nverflnw Replace rip rap ¡1 m¡ssing. Remove any trash ol debris and dispose of properly. Side Slopes Annually Check around inlets and outlets for signs of erosion, Check berms for signs of sliding or settling. Action is needed where eroded damage is over 2 inches deep and where there is potential for continued erosion. Try and determine what has caused the erosion and fix it. Stabilize slopes by reinforcing the slope with rock, planting grass, or compacting the soil. Contact WSU Cooperative Extension for guidance on slope reinforcement. Storage Area Annually Check to see if sediment is building up on the pond bottom, A buried or partially buried outlet structure or very slow infiltration rate probably indicates siqnificant sediment deposits. Clean out the sediment and re-seed the pond if deemed necessary to improve inf¡ltration and control erosion. Dikes Annually Any part of the dike that has settled sionificantlv. Build the dike back to the original elevation. Emergency Overflow/Soillwav Annually Check to see that the rip rap protective area is intact. lf any exposed native soil is present you should repair it. Replace rocks so that all native soil is covered. Under Drain/Monitoring Ports Quarterly Check to see that the pond ¡s drained dur¡ng periods of no rain. lf pond retains water, check monitoring ports of under drain system. lf under drains are full. drains reouire cleaninq. Clean drains by pressure jetting through cleanouts provided at the end ofthe under drain laterals provided. Call a professional enqineer and Thurston Countv is persists. Yelm Community Schools -Bus Transfer Station Drainage and Erosion Control Report JWM&A #05102 25 G ROU N DS AN D LAN DSCAPTNG ACCESS ROADS AND EASEMENTS Paft of Grounds to Check When to Check it What to Check For Whatto Do Landscaoed Aread Quarterly Weeds growing out of control in landscaped aÍea. Pull weeds by hand, if possible, to ãvoid using chemical weed controlè. Landscaoed Aread Quarterly Check for any presence of poison ivy or other poisonous vegetat¡on or ¡nsect nests. Remove ooisonous veqetatioh or insect nests that arã present in landscaped area. Landscaoed Aread Quarterly There should not be any vard waste or litter in landscaped areas. Remove and dispose of litter properly Landscaoed Aread Quarterly Noticeable rills are seen in landscaped areas. ldentifv the causes of erosion and take steos to slow down or disperse the water. Fill in contour, and seed area. Trees and shrubs Annually Limbs or parts of trees or shrubs that are split or broken. Trim trees and shrubs to restore shaoe. Reolace severely damaged'trees and shrubs. Trees and shrubs Annually Trees or shrubs that have been blown down or knocked over. Replant trees or shrubs, inspectinq for iniurv to stem or rools. Relolace'if deverelv damaged.' Trees and Shrubs Annually Trees or shrubs that are not adequately supported or are leaning over, caûsingexþösure ofthe roots. ' Place stakes and rubbercoated ties around vouno trees/shrubs for suþportI Area to Check When to Check Ít Whatto Check For Whatto Do General One Time Check to determine if there is enouqh access to vour stormwater facilities for maiñtenance veñicles. lf there is not enouoh access, check with'your local iurisdiction to -deterinine whether an easement exists. lf so, a maintenance road mav need to be constructed therê. Access road Quarterly Debris that could damaqe vehicle tires (glass or metal). Clear all ootentiallv damaginö debris. ' Access road Annually Any obstructions that reduce clearance above and along the road to less than 14 feet. Clear alono and over roadway sõ there is enough ctearance. Road surface Annually Check for potholes, ruts, mushy spots, or woody debris that limit access by inaintenance vehicfes. Add gravel or remove wood as necessary. Shoulders and ditches Annually Check for erosion along the roadway. Reoair erosion with addit¡onal soil or gravel. Yelm Community Schools -Bus Transfer Station Drainage and Erosion Control Report JWM&A #05102 26 DRYWELLí FRENCH DRATNS, OR DOWNSPOUTS RESOURCE LISTING If you are unsure whether a problem exists, please contact your local jurisdiction at one of the numbers below and ask for Technical Assistance. Contact Numbers: Thurston County (Storm & Surface Water) 754-468t WSU Cooperative Extension 786-5445 Developer Information : Yelm Community Schools P.O. Box 476 Yelm, WA 98597 Phone: (360) 458-6128 Fax: (360) 458-6434 En gineer's Information : Trent J. Lougheed, P.E. Jerome W. Morrissette & Associates L700 Cooper Point Road SW, #82 Olympia, WA 98502 Phone: (360) 352-9456 Fax. (360) 352-9990 Yelm Community Schools -Bus Transfer Station Drainage and Erosion Control Report JWM&A #05102 Part of Sysúem fo Check When to Check Ít What to Check For Whatto Do Downspout Annually Water overflows from the downspout over the ground. First try cleaning out the outters and downsDouts. ff this doesn't solve the oroblem vou mav need to install a 6igger diywell. Roof Annually Moss and aloae are takino over the shad¡er parts of the õhingles. Disconnect the flexible oart of the downsoout that leads to the drvwèll. Perform moss-removal as desired. Pressure wash or use fattv acid solutions instead of hidhlv toxic oesticides or-clílorine bleach. lnstall a zinc strip as a preventative. 27 LOG SHEET Use log sheets to keep track of when maintenance checks occur and what items, if any, are repaired or altered. The completed sheets will serve as a record of past maintenance activities and will provide valuable information on how your facilities are operating. This information will be useful for future requirements regarding the types of facilities that are installed. It helps to keep all log sheets in a designated area so others can easily access them. Date Checked_J_J_ Checked By Name: Position in HOA: Address: City: State:_ Zip: Phone Number: Part of Facility Checked Observations (List things that should be donel Fo I low-u p Actio ns Ta ke n Date Action Taken Yelm Community Schools -Bus Transfer Station Drainage and Erosion Control Report JWM&A #05102 28 ATTACHMENT "8" POLLUTION SOURCE CONTROL PROGRAM WHAT ARE POLLUTION SOURCE CONTROLS, AND WHY ARE THEY NEEDED? Pollution source controls are actions taken by a person or business to reduce the amount of pollution reaching surface and ground waters. Controls, also called "best management practices" (BMPs), include: . Minimizing vegetation/groundcover disturbance. o Stabilizing existing exposed soil suffaces through feftilizing and seeding, and mulching with chopped hay during the wet season (15 October through 15 March). o Maintaining roof, patio, sidewalk and paved driveway areas free of debris accumulation; refraining from using soaps and detergents in washing these exterior surfaces; and carefully controlling activities in these areas so as to preclude hazardous materials spills (i.e. chemical storage, vehicle maintenance, etc.). . Substitute non-toxic products for toxic materials, recycle used oil and a ntifreeze immed iately. . Refrain from storing hazardous or toxic chemicals or other substances. Where it is imperative to store such materials, enclose them in a lockable cabinet. o Limit the use of fertilizers and pesticides to the precise amount recommended by professionals working the area. Pollution source controls are needed because of the contamination found in runoff from residential areas and the etfect of this contamination on aquatic life and human health. Research on urban runoff in the Puget Sound area and elsewhere has found oil and grease, nutrients, organic substances, toxic metals, bacteria, viruses, and sediments at unacceptable levels. Effects of contaminated runoff include closure of shellfish harvesting areas and swimming areas, mortality of young fish and other aquatic organisms, tumors on fish, and impairment of fish reproduction. MATERIATS USED AND WASTES GENERATED Of particular concern are drives and parking areas. Because of heavy vehicle usage, the concentration of oil and grease in stormwater may exceed the Ecology guidelines of 10 mg/1 . Although there are no local data to confirm this Yelm Community Schools -Bus Transfer Station Drainage and Erosion Control Report JWM&A #05102 view, limited research in the San Francisco Bay area found the mean concentration of oil and grease in stormwater to exceed 10 mg/1. REQUIRED ACTIONS The following actions shall be taken to ensure that pollution generated on site shall be minimized: 1. Sediment removed from ponds and swales shall be disposed of in a proper manner. Contact the local governing jurisdiction for inspection prior to completing this task. 2. No activities shall be conducted on site that are likely to result in shortterm, highly concentrated discharge of pollution to the stormwater system. Such activities may include, but are not limited to, heavy vehicle maintenance, and cleaning of equipment used in the periodic maintenance of buildings and paved surfaces. 3. Use of pesticides and fertilizers shall be minímized. 4. Do not dump paint, solvents, oils, or other such substances, including landscape waste, into storm swales or pond. Yelm Community Schools -Bus Transfer Station Drainage and Erosion Control Report JWM&A #05102 30 APPENDIX D Engineerns Gonstruction lnspection Report Form Yelm Community Schools -Bus Transfer Station Drainage and Erosion Control Report JWM&A #05102 3l ENGINEER'S CONSTRUCTION INSPECT¡ON REPORT FORM Project Name: Project Number: Location (address, or other): Pond lnformation: 1. Type: 2(a). After pond construction, have infiltration tests and/or soil logs been completed? 2(b). lndicate test results and compare with design criteria (pre-construction soils information). Do the post-construction values indicate a need to modify system design? Explain. 3. Outlet Type Filter, Oil Water Separator, Single Orifice, Oil Water Separator, Multiple Orifice, Slot, V-notch, Other Yelm Community Schools -Bus Transfer Station Drainage and Erosion Control Report JWM&A #05102 32 4. Outlet works at correct elevation(s), filter fabric installed properly (if needed), etc. 5. Spillway at correct elevation, slope, adequately armored, etc. Conveyances: 1. Channels properly graded, sloped, planted, etc. 2. Sewers at proper grade, inlets as designed, trenches as designed, pipe bedding properly prepared, backfilling procedures correct, materials as specified, etc. Roof Leaders: 1. Do roof leaders drain to infiltration trenches or as shown on the approved plans. Erosion Control 1. Erosion facilities in place at the specified time relative to other construction. 2. Construction entrance pad as specified. Yelm Community Schools -Bus Transfer Station Drainage and Erosion Control Report JWM&A #05102 33 3. Did facilities keep sediment, mud, etc., out of water bodies, wetlands, and from crossing the property boundary. 4. Are permanent erosion control measures in place and as designed. Signature and Seal: I or someone under my direct supervision have adequately inspected the project during construction and to the best of my knowledge the project was built according to the approved plans and specifications except as not above. Signature/Date Yelm Community Schools -Bus Transfer Station Drainage and Erosion Control.Report JWM&A #05102 34 APPENDIX E Thurston Region Stormwater Facilities Summary Yelm Community Schools -Bus Transfer Station Drainage and Erosion Control Report JWM&A #05102 35 THURSTON REGION FACILITY SUMMARY FORM PROPONENT'S FACILITY IDENTIFIER: Yelm Community Schools -Bus Transfer Station NAME OF ROAD TO ACCESS FACILITY: Stevens Avenue NW HEARINGS EXAMINER CASE NUMBER: DEVELOPMENT REVIEW PROJECT NO.: BUILDING SITE APPLICATION NO.: PARCEL NUMBER(S) 2271e310100 22719310300 22719310301 22719310200 To be completed by Utility Staff: Utility Facility Number: Project Number: Parcel Number Status: Basín & Subbasin: Responsible Jurisdiction : PART I -Project Name & Proponent Project Name: Bus Transfer Station Project Owner: Yelm Community Schools Project Contact: Erling Birkland Address: P.O. Box 476, Yelm, WA 98597 Telephone: (360) 458-6128 Yelm Community Schools -Bus Transfer Station Drainage and Erosion Control Report JWM&A #05102 36 Project Proponent: /same Address: /same Telephone: /same Project Engineer: Trent Lougheed, P.E. Firm: J.W. Morrissette & Associates lnc., p.S. Telephone: (360) 352-9456 Fax: (360) 352-9990 PART 2 -Project Location Section: 19 Township: 17N Range: 2E Name & Address of Adjacent Property Owners: Parcel Number Name Address 22719240600 Samantha Ridge LLC 111 5th Street NE 22719240500 Cenex, lnc. 22719310402 TLC LLC il Auburn, WA 98002 PO Box 64089 St. Paul, MN 55164 PO Box I 146 Yelm, WA 98597 22719310400 Esther M. Webb PO Box 497 Yelm, WA 98597 22719320100 Maureen C. Lees PO Box 841 Yelm, WA 98597 22719320102 Troy P. Truong 803 Cardigan Street NW Olympia, WA 98502 Yelm Community Schools -Bus Transfer Station Drainage and Erosion Control Report JWM&A #05102 37 22719240400 Ryan C & Tami M 404 Edward Street SW Pearson Yelm, WA 98597 PART 3 -Type of Permit Application Type of Permit: Commercial Other Permits:DOEA/VHPA COE 404 FEMA COE Wetlands DOE Dam Safety Flood Plain Shoreline Mgmt. Rockery/Retaining Wall Encroachment Grading Other: Other Agencies that have had or will review this Drainage & Erosion Control Plan: None PART 4 -Proposed Project Description What stream basin is this project within: Yelm Creek Zoning: lndustrial (l) Onsite: Bus Transfer Station Number of Lots: 1 Avg. Lot Size: 8.84 Acres Building PermiUCommercial Plat: Building Footprint (Acres): 0.609 Concrete Paving (Acres): 3.931 Gravel Suface (Acres): 0.000 Lattice Block Paving (Acres): 0.000 Public Roads (incl. gravel shoulder) (Acres): 0.000 Yelm Community Schools -Bus Transfer Station Drainage and Erosion Control Report JWM&A #05102 38 Private Roads (incl. gravel shoulder) (Acres): 0.000 Onsite lmpervious Surface Total (Acres): 4.540 PART 5 -Pre-Developed Project Site Characteristics Stream Through Site Y Steep Slopes (> 10%) N Erosion Hazard N 100 Year Flood Plain Y Wetlands Seeps/Springs High Groundwater Table Unknown Aquifer Sensitive Area N Other: PART 6 -Facility Description TotalArea Tributary to Facility lncluding Offsite (Acres): Total Onsite Area Tributary to Facility (Acres): Design lmpervious Area Tributary to Facility (Acres): Design Landscaped Area Tributary to Facility (Acres): Design Total Tributary Area to Facility (Acres): lndicate Types of Facilities lncluded in Project: Wet Pond Detention 0 Dry Pond Detention 0 Underground Detention: 0 lnfiltration Pond: 1YN 4.650 4.650 4.540 0.110 4.650 Yelm Community Schools -Bus Transfer Station Drainage and Erosion Control Report JWM&A #05102 39 Dry Well lnfiltration: Coalescing Plate Separator: Centrifuge Separator: Other: lndicate Outlet Types lncluded ln Project: Filter: 1 (Biofiltration Swale) Wet Vault: OilAffater Separator: 0 Single Orifice: 0 Multiple Orifice: . 0 Weir: Spillway: Pump(s): Other: PART 7 -Release to Groundwater (Emergency Overflow to Creek) Design Percolation Rate to Groundwater: PART I -Release To Surface Water 20.0 in/hr No release to surface water -100o/o lnfiltration. 00000100 Yelm Community Schools -Bus Transfer Station Drainage and Erosion Control Report JWM&A #05102 40 .pdf 09-021~1.PDF 09-0210 MDNS.pdf image001.jpg .jpg image001.jpg image001.jpg image/jpeg image001.jpg@01CABC64.0FC80A40