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Storm Drainage
Storm Drainage Analysis and Report #04017 Site Location: Willow Glen Phase III Subdivision 16401 & 16411 SE Middle Rd Yelm, WA 98597 Prepared For.• Yelm Property Development LLC Attn: Dennis Balascio 16422 Middle Rd. SE Yelm, WA 98597 Prepared By: SKILLINGS-CONNOLLY, INC Consulting Engineers 5016 Lacey Boulevard S.E. Lacey, Washington 98503 (360) 491-3399 °, F. ,x ~Fpo~, °~~ .` Zpp~ _~' H. ~~P of 3 ~~` ~ ~~ ~i 9 I 9 22174 O ~~/ Ff FC~STER~~ EXPIRES ,~~AL O May 2004 Revised August 20, 2004 ~~-~Y TABLE OF CONTENTS SECTION PAGE 1. Introduction ............................................................................................. 1 2. Existing Conditions .................................................................................. 1 3. Infiltration Rates /Soils Report ................................................................ 1 4. Wells and Septic Systems ....................................................................... 1 5. Fuel Tanks .............................................................................................. 2 6. Sub-Basin Description ............................................................................. 2 7. Analysis of 100-Yr Flood ......................................................................... 2 8. Aesthetic Considerations for Facilities .................................................... 2 9. Facility Sizing .......................................................................................... 2 10 .Covenants, Dedications, Easements ....................................................... 2 11 . Property Owner's Articles of Incorporation ............................................ 3 12 . Erosion Control .................................................................................... 3 APPENDICES A. Project Maps Vicinity Map USGS Regional Topography 100-Yr Flood Map (FEMA) Basin Map Water Quality Treatment Area Map B. Calculations 8~ Computer Analysis - Facility Sizing Waterworks Computer Modeling C. Supporting Documentation Soils Data Soils Map Soil Log Map D. Maintenance Schedule SKILLINGS-CONNOLLY, INC. I Willow Glen Div. 2 Consulting Engineers Storm Drainage Analysis & Report SECTION 7 INTRODUCTION The proposed plat of Willow Glen, Phase III subdivision, is a 44 lot residential development located on the south side of Middle Road in the City of Yelm. The land is currently pasture with a couple large trees dispersed throughout the site and one existing residential home. The project includes the addition of 44 residential lots for single family homes, new roadways and sidewalks, sewer and water services and stormwater facilities to treat and dispose of the project's stormwater. The proposed roadway features and utilities will be extended from Middle Road to the development. The project is located in Sections 19, Township 17 North, Range 2 East, W.M. The Thurston County's tax parcel numbers associated with the project are 64303600800, 64303600801 and 64303600701. The project will add approximately 3.2 acres of impervious area from roads and driveways. Increase in stormwater runoff resulting from the addition of paved surfaces will be treated by bioswales, or other approved BMP's. The stormwater runoff will be infiltrated using infiltration basins sized to infiltrate 100% of the 100-yr, 24 hr design storm. This storm drainage and analysis report is being prepared in accordance with the Washington State Department of Ecology's stormwater Management Manual for the Puget Sound Basin (The Technical Manual) 1992. SECTION 2 EXISTING CONDITIONS The existing plat site consists of approximately 11.86 acres. The site is currently covered with grass and slopes generally towards the west. One existing house is on the site and will be removed as part of the construction. SECTION 3 INFILTRATION RATE /SOILS REPORT Site soils are identified by the Soil Conservation Service Soil Survey of Thurston County, Washington as a Spanaway gravelly sandy loam, a Type `B' soil. This soil is characterized as very deep, somewhat excessively drained and formed on terraces. Soil test holes were dug in the vicinity of the proposed infiltration basins of the project, and observations confirm that the soil types do match the SCS soils. A soil log map showing the location of the test holes is attached in Appendix C. Based on observations of the soil texture in these test holes, the sandy soil wilt have a subsurface percolation rate in excess of 30 in / hr. A conservative rate of 2 in / hr will be used for design to include a factor of safety for reduced infiltration the pond bottom over time. SECTION 4 WELL AND SEPTIC SYSTEM Each lot will be served by City of Yelm STEP collection system. The holding tank is maintained by the city and is pumped on a regular basis. Domestic water will be provided by the City of Yelm's water distribution system. SKILLlNGS-CONNOLLY, /NC. 1 INllow Glen Div. 2 Consulting Engineers Storm Drainage Analysis & Report SECTION 5 FUEL TANKS There are no known underground storage tanks in the immediate area. SECTION 6 SUB-BAS1N DESCRIPTION Local topography and the surrounding roadways preclude any off-site contributions of runoff. The on-site area can be considered as a single basin for quantity and quality treatment. The impervious area was considered to be from back of curb to back of curb. An estimate of 674 sq-ft was used for the contributing area for the driveway from each home. Each home will have a drywell to handle the roof runoff. An estimate of 1260 sq-ft was used for the contributing pervious area for the front yard from each lot. The stormwater facilities for the improvements will treat the stormwater runoff for quantity and quality for the entire roadway for the proposed development. The contributing impervious area from the frontage road improvements was considered to be the 16 ft roadway and 0.5 ft curb. The runoff from the sidewalk along the frontage was not included and is considered to infiltrate in the planter strip. SECTION 7 ANALYSIS OF THE 100-YR FLOOD A part of the site is within the 100-year flood plain boundary. A copy of the current FEMA Flood Insurance Map is included in the appendix. SECTION 8 AESTHETIC CONSIDERATIONS FOR FACILITIES The basins will be grassed and feature gentle side slopes and will be as shallow as possible to blend into the surrounding environment as much as possible. SECTION 9 FAC1LlTY SIZING AND DOWNSTREAM ANALYSIS The basins will be sized and analyzed using Waterworks software using the Santa Barbara Unit Hydrograph method fora 100-yr, 24-hr SBUH Type 1A storm event. As previously described, conservative infiltration rates were used for the design calculations. See attached description of drainage areas. TREATMENT A wet pond has been designed per Section III-4.4.1 of the Washington State Department of Ecology's stormwater Mana4ement Manual for the Puget Sound Basin (The Technical Manual) 1992 for treatment of the stormwater prior to infiltration. The volume of the wet pond is equal to the volume of the 6-month, 24-hour design storm event of 17,519 cf. The surface area of the wet pond is 5,148 sf which is greater than the required area of (17,519 / 4.5 ft) 3,893 sf. STORMWATER BASIN After the stormwater is treated it will be directed to an infiltration basin located west of the development. The infiltration basin will be excavated from the existing grade and will have a bottom elevation of 330.0. No material will be imported into the 100-year flood plain. A storage volume of 16,215 cubic feet is provided during the 100-year design storm event with a water surface elevation of 330.57. One-half foot of free board is provided in the stormwater basin up to elevation 331.0. Please note that no untreated stormwater will enter the 100-year flood zone. Ground water was observed at elevation 327 feet on March 18, 2004. Please note that the bottom of the infiltration basin is located 3 feet above the observed groundwater elevation. The infiltration basin is located within the 100-year flood plane of Yelm Creek. The elevation of the 100-year flood is 333.0 per FEMA. During a 100-year flood event flood water will enter the SKILL/NGS-CONNOLLY, INC. 2 Willow Glen Div. 2 Consulting Engineers Storm Drainage Analysis & Report infiltration basin and infiltrate. Please note that no material will be imported into the 100-year flood zone, therefore the storage volume during the 100-year flood will not change. A downstream analysis will not be necessary for this site because 100% of the 100-yr, 24-hr event will be infiltrated. SECTION 10 COVENANTS, DEDICATIONS, EASEMENTS TO BE INCLUDED IN THE FINAL PLAT DOCUMENTATION SECTION 11 PROPERTY OWNERS ARTICLES OF INCORPORATION TO BE INCLUDED IN THE FINAL PLAT DOCUMENTATION SECTION 12 EROSION CONTROL Erosion control features and a construction sequence shall be included on the construction plans. If properly administered, the erosion control features will prevent sedimentation migration from the site. The site is flat, possesses extremely porous soils and will remain protected along the perimeters during grading activities. Construction entrances will also be included as part of the Temporary Erosing and Sedimentation Control Plan. 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Z I a 5o,ao'•. ---_ .~_... t ~ 1 ,,, ._~. --~... ~ / ,; 5 ' ' }~ .. m 62 0 .00 56 02 r W w ~ II , ~ _ .. 1 __ __~ ._..._.. .__.._._._ __.. ~ 1 '~~J4 ....... _..._..._._ --0-,.-.,, iI W 1 ... .-~•' m _ O .o~~' I 1 J 1 ~ ~ ~ ~ o ~ ~ W 1 ~ ~ I ~ ~ °~ ~ ~~~~ :•.• . _ ,, I 69.11 ~ ~ J - - ~ • , ,. ~ 19.55 50.00 - - - ~ti . ~ ~ 5~. 3ye9 ~ .1 4 .. ~ .... _ 69.0 ~ .. ,., ... ..., .,. a ~ ~Q l~ 16 3 C.J I q SS SS ;,SS SS 4 SS 5 S ~.. `~~-.. ~; N N , - ~ ENO 6J.60 'o L ~ ~-~ ~ ~ 4 I ~ R AD G ~~:.. 'g ' ~ `'900 I 0W 26.43 50 00 b0.00 ??.86 ?j9 NN 4 ,. r-- - - - - _ ~ ._ o of C,d ~,,~ ~,,~ ~ W ....__ w ; \\ ~ ~ p ~ ~ ~ I ~ : i „ ~ V ~ 43t.I1.... ~ C o t06N ~ , ~ L_-,__ ,~ _.. r .._ ~ ~ `d 60.00 65.00 53.00 50.00 60.00 7.0 0 ~ ~ ? v ~\ 63.38 45.00 -- - w---W---W--- -_ t' E 10 WM + 46'N' T W <... - - - - - W - - - W O - - W - - -~H -•- - W - -C:' W - - - - - -7 370 ~~ 4J ~ ~ ? O O O ~_ _ ~_ _ _~y_ _ _~_ _ W .._.. O ~......-W -__-.W -W ~ J ~ J m O € / _..._._ ..._ ....__....... ~ v _ _....._......_. a SS- - - SS- - - SS - - - - - SS- -- - ~S- - - «- - r ..~ __ .............._...._~~_ _crf!oo _ APPENDIX 6 Calculations & Computer Modeling Facility Sizing Waterworks Computer Modeling SKILLINGS-CONNOLLY, INC. tM/low Glen Phase 111 Subdivision Consulting Engineers Storm Drainage Analysis 8 Report SKILLINGS Project Name: ~~ )~1~ow >len I~h~~e_ Ill C O N N O L LY Project No.: o~(0 1 'l CONSULTING ENGINEERS Date: 8 - 2.O -d I-1 By: S 'CJ Lacey, Washington 360-491-3399 Sheet: ~~ '~ n (~ ~ Page I of _(_ ~G..v e.c~e..tt~ \ • ~ 'C~ C S'. dew~.~~•5 U, 2..5 (~C z.53 ~~ ~SKILLINGS ~CONNOLLY CONSULTING ENGINEERS Lacey, Washington 360-491-3399 Project Name: ~~ ~~4~~/ ~ ~ c r_ l'/! u s P 1~ Project No.: /~ y rJ ~ ~ Date: US - l y - 0 y By; lr~1v~ Sheet: l~ r u ~ ~ ~ ...o ~4 t c a s Page r of 7"u f"o L /7 0 ~ d w ~ / I arc, ~ Pr v r d o r ,4 r e a. ~ /? - U -~i = ~, S /l privC way ~ 6 J`/ 5,~= ~Pr Co?` fa1!a.~~ti~ Tip ~'~~ico/ 5 pG 7'` ~ o n C' ~t ~ ~U S p~/ _ ~y dais ~- 57`.' Sf~3s6U - O 6~f!c Frog ~ ~~~ Tom/ 8.~~- v~~~ / PC.~~vE,~ sT~if' = ti' ~a is = 3, s. 8_ ~ _ y - C . . STprrn wat'~r Ye 7~Phs~on ~7 ok~~~" WET,_~0~1~ ~~_ t.3a•4~ ~'urk arccc.. _ fur ~/p v A (apoa ~ ~ r ~ ~ = 2.~`Ls ~aps 17U~ Con'`rt5~~,~n ~~ I^~~ensia~ _f~onr~ <<'86~G• ___ __ G N - 48 _ __ __ _ _ Tu*a l_ _ ('Pr_~_jou.3 %4~~a ~~on.t~16 ut~tiL~ = 3,5_S!~ C,v - sus TYPE 1~4 Tsop /~,~«/s ~ Yr ~ z 4 !t r ~n o~ c 4 t P ; __~- ] TL' n f!~ s _? . ~ r h c ~PS { f~''~ , ? ~ f' r S ~`o r m ! S ~ 9 %D D f o~ %'^ a `'~ ,C ~ $ ''`ar ~- r 4/ ?~ ~" ~- ~ %~ ;f A ~ ~- 1. .`' ;/~ ~ ;i r /? ~~ STORMWATER MANAGEMENT MANUAL FOR THE PUGET SOUND BASIN 4 124 123 q, j i - i -~ 15 _ 25 a*~ \ I ~ z ~ T i ~'~~ ~ ~ B E ;iQ1 I I ~ ~~~ OLGA ~ i 25 `a - ~ ~ FRIC)AY HARBOR w~ ~ I i ~~ ~ "~~ \ PORT SiA LEY r40 ~ ~ ~ ~~~'#5~ lJ( ~ ~ ~ Mr v r --, '' E ~ ~ 40\~ I ~ / ~ \ 1 j 35 302520 ~'Oi ~~ ~~ 3 I ~ ~~ 15/L ~ 10 ~ ~~ ~, ~ i ' "-III = - ~ i ENERETT q~~~ `~ ; , _ ~ . ~ ~~~ ~ G" - ~ ~'' as rc 3321 ~ / 501 C X51 ~ , , I 40\ a ~~ ' 35, i ~ (L \. 30t ~~ 47 ,, ~r ~~ _ /~ I K ~1 ~ I ~I ~ 1 // ~ 45 ~ r ~ ~35 Coma .3 30 25 ~ a: 25 ~_ ~, (~ ~ 1`~.• CENT _ M~ -- ~. -_~ n ~~ i6 I 35 ~3~ 19~~ ~ 155 ~ \ ~ i WASHINGTON ~ ~< 10 0 10 20 30 40 ~ -- MILES 20 ~ ~ i `. ~ Figure 25 I ~ / ~ I 25 ~- ISOPLWIALS ©F 2-YR 24-HR PRECIPITATImN IN i TENTHS OF AN INCH ~ ~ ~ i 124 123 121 E~ if 1 ~~ A >~ ar ~mti ~~~ 15 c s \' ~~1ATC 1 '~ ~ ~~ s _ 1~ _ - YAKI 10 45~~ s 40 > ~~: 61 ADA 1 ~ ~ 45s ~ -- ~- i ~ 3 + ~ 25 ,_ I B K ~~ PPL _ &BLDEN E - ~~' S ~ ~ V LtJ10K~r~ ~ .~ ''~f1'. t . \ / ~~ i NOAA ATLAS 2, Volume IX I / Prepared by U.S. Department of Co`'nmerce National Oceanic and Atmospnenc Administration National Weather Service, p}}ica ofih+vorotagy Prepared for U.S. Department of Agriculture, Soil Conservation Service, Engineermq Division 122 121 122 --" ~ ~= r`.'t3xuARY, 1992 STORMWATER MANAGEMENT :~~,NUAL FC= THE PUGET SOUND BASIN 49r-- ~ 15 \ 1 48 \ \ 15 ~ 80 \ 85. 90\, 100', 4 71- 124 123 122 :. ` ~ - - . X51 I , o ;. 121 b ~4 \ EL l ~r- 4' t ~~ \ n ~ ~~~~~; ~ ~'aq~ ~ 70 i~ p r rte..-~'~~,?,'CDEN 10 0 10 20 30 40 401 .~ ~ ~qp ~~r-..I ~ ~"~/~3 / ~~ ------~ MILES ~ ~ '`-~ ~' SQ ~ rn v r ,J i Figure 30 ~ ~~ ; ! yaAA ATLAS z, volume ix -05~ ~ ~~ Prepared by U.S. Department of Co~nmeree ISOPLUVIALS F 100-YR 24-NR PRECIPITATION 055 ~ Natidnai0ceamcandAtmosohericAtiministratio IN TENTHS OF N INCH ~+.nonai Weather Service. Office oflHydroiogy Preoarea for U.S. Department of Agriculture. Sail Conservation Service. Engmeering Division 124 123 12~ 12; tCKLI III-i-~6 FEBRUARYt 1°92 STORMWATER MANAGEMENT MANUAL FOR THE PUGET SOUND BASIN Table III-1.3 SCS Western Washington Runoff Curve Numbers (Published by SCS in 1982) Runoff curve numbers for selected agricultural, suburban and urban land use for Tvne to rainfall distribution. 24-hour storm duration. LAND USE DESCRIPTION CURVE NUMBERS BY HYDROLOGIC SOIL G ROUP A B C D Cultivated land(1): winter condition 86 91 94 95 Mountain oven areas: low growing brush & grasslands 74 82 89 92 Meadow or pasture: 65 78 85 89 Wood or forest land: undisturbed 42 64 76 81 Wood or forest land: young second growth or brush 55 72 81 86 Orchard: with c over crop 81 88 92 94 Open spaces, lawns, parks, golf courses, cemeteries, landscaping. Good condition: grass cover on z75$ of the 68 ~ 86 90 area Fair condition: grass cover on 50-75$ of 77 85 90 92 the ar ea Gravel roads & parking lots: 76 85 89 91 Dirt roads & arking lots: 72 82 87 89 Impervious surfaces, pavement, roofs etc. 98 98 98 98 O en water bodies: lakes, wetlands, onds etc. 100 100 100 100 Single family residential(2): Dwelling Unit/Gross Acre $Impervious(3) Separ ate curve number 1.0 DU/GA 15 shall be select ed for 1.5 DU/GA 20 pervi ous & impe rvious 2.0 DU/GA 25 porti ons of the site 2.5 DU/GA 30 or ba sin 3.0 DU/GA 34 3.5 DU/GA 38 4.0 DU/GA 42 4.5 DU/GA 46 5.0 DU/GA 48 5.5 DU/GA 50 6.0 DU/GA 52 6.5 DU/GA 54 7.0 DU/GA 56 PUD's, condos, apartments, $impervious commercial businesses & must be industrial areas computed (1) For a more detailed description of agricultural land use curve numbers refer to National Engineering Handbook, Sec. 4, Hydrology, Chapter 9, August 1972. (2) Assumes roof and driveway runoff is directed into street/storm system. (3) The remaining pervious areas (lawn) are considered to be in good condition for these curve numbers. III-1-12 FEBRUARY, 1992 8/20/04 2:59:53 pm Skillings Connolly, Inc page 1 WILLOW GLEN PHASE 3 JOB NO 04017 _____________________ BASIN SUMMARY BASIN ID: A-100YR NAME: 100YR STORM EVENT SBUH METHODOLOGY 79 Acres 7 BASEFLOWS: 00 cfs TOTAL AREA.......: . PERV IMP RAINFALL TYPE....: TYPElA 00 inches 4 AREA..: 3.58 Acres 4.21 Acres PRECIPITATION....: TIME INTERVAL....: . 10.00 min CN....: 80.00 98.00 TC....: 15.00 min 15.00 min ABSTRACTION COEFF: 0.20 PEAK RATE: 4.57 cfs VOL: 1.93 Ac-ft TIME : 480 min BASIN ID: A-2YR NAME: 2YR STORM EVENT SBUH METHODOLOGY 79 Acres 7 BASEFLOWS: 00 cfs TOTAL AREA.......: . PERV IMP RAINFALL TYPE....: TYPEIA 00 inches 2 AREA..: 3.58 Acres 4.21 Acres PRECIPITATION....: TIME INTERVAL....: . 10.00 min CN....: 80.00 98.00 TC....: 15.00 min 15.00 min ABSTRACTION COEFF: 0.20 PEAK RATE: 1.79 cfs VOL: 0.79 Ac-ft TIME: 480 min BASIN ID: A-6M0 NAME: 6M0 STORM EVENT SBUH METHODOLOGY 49 Acres 7 00 cfs BASEFLOWS: TOTAL AREA.......: . PERV IMP RAINFALL TYPE..._: TYPElA 28 inches 1 AREA..: 3.58 Acres 3.91 Acres PRECIPITATION....: . 00 min 10 CN....: 80.00 98.00 TIME INTERVAL....: . TC....: 15.00 min 15.00 min ABSTRACTION COEFF: 0.20 PEAK RATE: 0.88 cfs VOL: 0.40 Ac-ft TIME: 480 min 8/20/04 2:59:53 pm Skillings Connolly, Inc page 2 WILLOW GLEN PHASE 3 JOB NO 04017 ________________________DETAIL BASIN SUMMARY BASIN ID: A-100YR NAME: 100YR STORM EVENT SBUH METHODOLOGY TOTAL AREA.......: 7.79 Acres BASEFLOWS: PERV00 cfs IMP RAINFALL TYPE....: TYPElA PRECIPITATION....: 4.00 inches AREA..: 3.58 Acres 4.21 Acres TIME INTERVAL....: 10.00 min CN....: 80.00 98.00 TC....: 15.00 min 15.00 min ABSTRACTION COEFF: 0.20 PEAK RATE: 4.57 cfs VOL: 1.93 Ac-ft TIME: 480 min TIME DESIGN TIME DESIGN TIME DESIGN TIME DESI(~i TZME DESIGN TZME DESIGN RUNOFF RUNOFF RUNOFF RUNOFF RUNOFF RUNOFF (min) (cfs) (min) (cfs) (min) (cfs) (min) (cfs) (min) (cfs) (min) (cfs) 310 0.7693 610 1.4252 910 0.9712 1210 0.7142 1510 0.0068 10 20 320 0.9203 620 1.3776 920 0.9755 1220 0.7126 1520 0.0034 30 330 1.0095 630 1.3556 930 0.9783 1230 0.7120 1530 0.0017 40 0.0045 340 1.0669 640 1.3425 940 0.9760 1240 0.7161 1540 0.0008 50 0.0209 350 1.1077 650 1.3417 950 0.9796 1250 0.7142 1550 0.0004 60 0.0461 360 1.1396 660 1.3431 960 0.9819 1260 0.7134 1560 0.0002 70 0.0891 370 1.1421 670 1.2767 970 0.8740 1270 0.7175 1570 0.0001 80 0.1453 380 1.1287 680 1.1762 980 0.7193 1280 0.7154 1580 90 0.1945 390 1.1272 690 1.1269 990 0.6421 1290 0.7146 1590 100 0.2361 400 1.1344 700 1.1074 1000 0.5995 1300 0.7187 1600 110 0.2709 410 1.1486 710 1.0946 1010 0.5825 1310 0.7166 1610 120 0.2998 420 1.1599 720 1.0892 1020 0.5742 1320 0.7158 1620 130 0.3386 430 1.5283 730 1.0916 1030 0.6379 1330 0.6811 1630 140 0.3840 440 2.0899 740 1.0896 1040 0.7419 1340 0.6294 1640 150 0.4159 450 2.3993 750 1.0896 1050 0.7943 1350 0.6037 1650 160 0.4377 460 3.1106 760 1.0946 1060 0.8208 1360 0.5866 1660 170 0.4572 470 4.0429 770 1.0939 1070 0.8344 1370 0.5825 1670 180 0.4726 460 4.5728 780 1.0945 1080 0.8416 1380 0.5606 1680 190 0.4830 490 4.1384 790 1.0296 1090 0.8115 1390 0.5754 1690 200 0.4947 500 3.1966 800 0.9276 1100 0.7585 1400 0.5773 1700 210 0.5042 510 2.7348 810 0.8771 1110 0.7323 1410 0.5784 1710 •220 0.5101 520 2.4471 820 0.8523 1120 0.8514 1420 0.5747 1720 230 0.5161 530 2.2491 830 0.8404 1130 0.7792 1430 0.5773 1730 240 0.5247 540 2.1563 640 0.8349 1140 0.6155 1440 0.5787 1740 250 0.5489 550 1.9520 850 0.8659 1150 0.6659 1450 0.4322 1750 260 0.5841 560 1.6900 860 0.9193 1160 0.6871 1460 0.2161 1760 270 0.6092 570 1.5617 870 0.9467 1170 0.6979 1470 0.1081 1770 280 0.6321 560 1.5040 880 0.9568 1160 0.7078 1480 0.0540 1780 290 0.6486 590 1.4738 890 0.9666 1190 0.7087 1490 0.0270 1790 300 0.6641 600 1.4611 900 0.9721 1200 0.7094 1500 0.0135 1800 8/20/04 2:59:53 pm Skillings Connolly, Inc page 3 WILLOW GLEN PHASE 3 JOB NO 04017 _____________________ -- DETAIL BASIN SUMMARY BASIN ID: A-2YR SBUH METHODOLOGY TOTAL AREA........ RAINFALL TYPE....: PRECIPITATION....: TIME INTERVAL....: NAME: 2YR 7.79 Acres TYPElA 2.00 inches 10.00 min STORM EVENT BASEFLOWS: AREA... CN..... TC..... 0.00 cfs PERV 3.58 Acres 80.00 15.00 min ABSTRACTION COEFF: 0.20 PEAK RATE: 1.79 cfs VOL: 0.79 Ac-ft TIME: 480 min TIME DESIGN RUNOFF (min) (cfa) 10 20 30 40 50 60 70 0.0025 80 0.0118 90 0.0266 100 0.0430 110 0.0591 120 0.0741 130 0.0923 140 0.1129 150 0.1298 160 0.1433 170 0.1560 180 0.1669 190 0.1757 200 0.1847 _210 0.1925 220 0.1985 230 0.2053 240 0.2111 250 0.2241 260 0.2407 270 0.2516 280 0.2602 290 0.2656 300 0.2702 TIME (min) 310 320 330 340 350 360 370 380 390 400 410 420 430 440 450 460 470 480 490 500 510 520 530 540 550 560 570 580 590 600 DESIGN RUNOFF (cfs) 0.3103 0.3679 0.3999 0.4186 0.4305 0.4388 0.4358 0.4270 0.4228 0.4224 0.4264 0.4311 0.5714 0.7871 0.9108 1.1942 1.5693 1.7944 1.6362 1.2714 1.0946 0.9850 0.9099 0.8763 0.7961 0.6913 0.6407 0.6187 0.6077 0.6039 TIME (min) 610 620 630 640 650 660 670 680 690 700 710 720 730 740 750 760 770 780 790 800 810 820 830 840 850 860 870 880 890 900 DESIGN RUNOFF (cfa) 0.5903 0.5718 0.5637 0.5593 0.5600 0.5616 0.5347 0.4933 0.4734 0.4659 0.4611 0.4594 0.4610 0.4606 0.4614 0.4641 0.4644 0.4652 0.4380 0.3950 0.3739 0.3637 0.3589 0.3569 0.3705 0.3937 0.4058 0.4105 0.4151 0.4179 TIME DESIGN RUNOFF (min) (cfa) 910 0.4179 920 0.4201 930 0.4217 940 0.4211 950 0.4230 960 0.4244 970 0.3781 980 0.3113 990 0.2781 1000 0.2598 1010 0.2526 1020 0.2491 1030 0.2769 1040 0.3223 1050 0.3452 1060 0.3570 1070 0.3632 1080 0.3666 1090 0.3537 1100 0.3308 1110 0.3195 1120 0.3718 1130 0.3404 1140 0.2690 1150 0.2913 1160 0.3007 1170 0.3056 1180 0.3101 1190 0.3107 1200 0.3111 TIME (min) 1210 1220 1230 1240 1250 1260 1270 1280 1290 1300 1310 1320 1330 1340 1350 1360 1370 1380 1390 1400 1410 1420 1430 1440 1450 1460 1470 1480 1490 1500 DESIGN RUNOFF (cfs) 0.3134 0.3129 0.3127 0.3148 0.3140 0.3139 0.3156 0.3151 0.3149 0.3169 0.3161 0.3159 0.3007 0.2780 0.2668 0.2593 0.2576 0.2569 0.2547 0.2556 0.2562 0.2547 0.2559 0.2566 0.1917 0.0959 0.0479 0.0240 0.0120 0.0060 IMP 4.21 Acres 98.00 15.00 min TIME DESIGN RUNOFF (min) (cfs) 1510 0.0030 1520 0.0015 1530 0.0007 1540 0.0004 1550 0.0002 1560 1570 1580 1590 1600 1610 1620 1630 1640 1650 1660 1670 1680 1690 1700 1710 1720 1730 1740 1750 1760 1770 1780 1790 1800 8/20/04 2:59:53 pm Skillings Connolly, Inc page 4 WILLOW GLEN PHASE 3 JOB NO 04017 _____________________ - DETAIL BASIN SUMMARY BASIN ID: A-6MO SBUH METHODOLOGY TOTAL AREA........ RAINFALL TYPE....: PRECIPITATION....: TIME INTERVAL....: NAME: 6M0 7.49 Acres TYPEIA 1.28 inches 10.00 min ;TORN EVENT BASEFLOWS: AREA... CN..... TC..... 0.00 cfs PERV 3.58 Acres 80.00 15.00 min ABSTRACTION COEFF: 0.20 PEAK RATE: 0.88 cfs VOL: 0.40 Ac-ft TIME: 480 min TIME DESIGN RUNOFF (min) (cfs) 10 20 30 40 SD 60 70 80 90 0.0005 100 0.0032 110 0.0087 120 0.0154 130 0.0238 140 0.0335 150 0.0424 160 0.0503 170 0.0579 180 0.0648 190 0.0708 200 0.0767 210 0.0821 220 0.0867 230 0.0915 240 0.0958 250 0.1034 260 0.1128 270 0.1195 280 0.1252 290 0.1292 300 0.1329 TIME (min) 310 320 330 340 350 360 370 380 390 400 410 420 430 440 450 460 470 480 490 500 510 520 53 0 540 550 560 570 580 590 600 DESIGN RUNOFF (cfs) 0.1544 0.1852 0.2033 0.2149 0.2230 0.2291 0.2293 0.2261 0.2253 0.2262 0.2285 0.2300 0.3017 0.4106 0.4688 0.6029 0.7776 0.8797 0.8010 0.6237 0.5388 0.4867 0.4513 0.4362 0.3974 0.3460 0.3215 0.3112 0.3064 0.3051 TIME (min) 610 620 630 640 650 660 670 680 690 700 710 720 730 740 750 760 770 780 790 800 810 620 830 840 850 860 870 680 890 900 DESIGN RUNOFF (cfs) 0.2988 0.2899 0.2863 0.2846 0.2854 0.2866 0.2733 0.2525 0.2426 0.2390 0.2368 0.2363 0.2373 0.2375 0.2380 0.2397 0.2401 0.2408 0.2269 0.2048 0.1940 0.1889 0.1866 0.1856 0.1929 0.2051 0.2116 0.2142 0.2168 0.2184 TIME DESIGN RUNOFF (min) (cfs) 910 0.2186 920 0.2199 930 0.2209 940 0.2208 950 0.2220 960 0.2229 970 0.1986 980 0.1637 990 0.1463 1000 0.1367 1010 0.1330 1020 0.1312 1030 0.1459 1040 0.1699 1050 0.1822 1060 0.1885 1070 0.1918 1080 0.1937 1090 0.1870 1100 0.1750 1110 0.1691 1120 0.1970 1130 0.1804 1140 0.1426 1150 0.1545 1160 0.1596 1170 0.1623 1180 0.1647 1190 0.1651 1200 0.1654 TIME (min) 1210 1220 1230 1240 1250 1260 1270 1280 1290 1300 1310 1320 1330 1340 1350 1360 1370 1380 13 90 1400 1410 1420 1430 1440 1450 1460 1470 1480 1490 1500 DESIGN RUNOFF (cfs) 0.1667 0.1665 0.1665 0.1677 0.1674 0.1673 0.1685 0.1682 0.1681 0.1692 0.1689 0.1689 0.1608 0.1487 0.1428 0.1389 0.1380 0.1376 0.1365 0.1371 0.1374 0.1366 0.1374 0.1378 0.1030 0.0515 0.0257 0.0129 0.0064 0.0032 IMP 3.91 Acres 98.00 15.00 min TIME DESIGN RUNOFF (min) (cfs) 1510 0.0016 1520 0.0008 1530 0.0009 1540 0.0002 1550 0.000] 1560 1570 1580 1590 1600 1610 1620 1630 1640 1650 1660 1670 1680 1690 1700 1710 1720 1730 1740 1750 1760 1770 1780 1790 1800 8/20/04 2:59:54 pm Skillings Connolly, Inc page 5 WILLOW GLEN PHASE 3 JOB NO 04017 DETAIL HYDROGRAPH S'UNIMARY HYDROGRAPH Peak runoff No. : 1 1.7 944 cfs Total Vol: 0.79 ac-ft TIME DESIGN RUNOFF TIME DESIGN RUNOFF TIME DESIGN RUNOFF TIME DESIGN RUNOFF TIMB DESIGN RIINOFF (min) (cfs) (mia) (cfs) (mia) (cfs) (min) (cfs) (min) (cfa) ------- 10 --------- -- 410 ----- 0.4264 810 0.3739 1210 0.3134 1610 20 420 0.4311 820 0.3637 1220 0.3129 1620 30 430 0.5714 830 0.3589 1230 0.3127 1630 40 440 0.7871 840 0.3569 1240 0.3148 1640 50 450 0.9108 850 0.3705 1250 0.3140 1650 60 460 1.1942 860 0.3937 1260 0.3139 1660 70 0.0025 470 1.5693 870 0.4058 1270 0.3156 1670 80 0.0118 480 1.7944 880 0.4105 1280 0.3151 1680 90 0.0266 490 1.6362 890 0.4151 1290 0.3149 1690 100 0.0430 500 1.2714 900 0.4179 1300 0.3169 1700 110 0.0591 510 1.0946 910 0.4179 1310 0.3161 1710 120 0.0741 520 0.9850 920 0.4201 1320 0.3159 1720 130 0.0923 530 0.9099 930 0.4217 1330 0.3007 1730 140 0.1129 540 0.8763 940 0.4211 1340 0.2780 1740 150 0.1298 550 0.7961 950 0.4230 1350 0.2668 1750 160 0.1433 560 0.6913 960 0.4244 1360 0.2593 1760 170 0.1560 570 0.6407 970 0.3781 1370 0.2576 1770 180 0,1669 580 0.6187 980 0.3113 1380 0.2569 1780 190 0.1757 590 0.6077 990 0.2781 1390 0.2547 1790 200 0.1647 600 0.6039 1000 0.2598 1400 0.2556 1800 210 0.1925 610 0.5903 1010 0.2526 1410 0.2562 1810 220 0.1985 620 0.5718 1020 0.2491 1420 0.2547 1820 230 0.2053 630 0.5637 1030 0.2769 1430 0.2559 1830 240 0.2111 640 0.5593 1040 0.3223 1440 0.2566 1640 250 0.2241 650 0.5600 1050 0.3452 1450 0.1917 1850 260 0.2407 660 0.5616 1060 0.3570 1460 0.0959 1860 270 0.2516 670 0.5347 1070 0.3632 1470 0.0479 1870 280 0.2602 680 0.4933 1080 0.3666 1480 0.0240 1880 _290 0.2656 690 0,4734 1090 0.3537 1490 0.0120 1890 300 0.2702 700 0.4659 1100 0.3308 1500 0.0060 1900 310 0.3103 710 0.4611 1110 0.3195 1510 0.0030 1910 320 0.3679 720 0.4594 1120 0.3718 1520 0.0015 1920 330 0.3999 730 0.4610 1130 0.3404 1530 0.0007 1930 340 0.4186 740 0.4608 1140 0.2690 1540 0.0004 1940 350 0.4305 750 0.4614 1150 0.2913 1550 0.0002 1950 360 0.4366 760 0.4641 1160 0.3007 1560 1960 370 0.4358 770 0.4644 1170 0.3056 1570 1970 380 0.4270 780 0.4652 1150 0.3101 1580 1980 390 0.4228 790 0.4380 1190 0.3107 1590 1990 400 0.4224 800 0.3950 1200 0.3111 1600 2000 8/20/04 2:59:54 pm Skillings Connolly, Inc page 6 WILLOW GLEN PHASE 3 JOB NO 04017 DETAIL HYDROGRAPH SUMMARY HYDROGRAPH No. 2 ft Peak runoff : 4. 5728 cfs Total Vol: 1.93 ac- TIME DESIGN TIME DESIGN TIME DfiSIC3i TIME DESIGN TIME DfiSIGN RUNOFF RUNOFF RUNOFF RUNOFF RUNOFF (min) (cfs) (min) (cfs) (min) (cfs) (min) (cfs) (min) (cfa) _______ __________ ________ ______ 1486 1 810 0.8771 1210 0.7142 1610 10 410 . 20 420 1.1599 820 0.8523 1220 0.7126 1620 5283 1 830 0.8404 1230 0.7120 1630 30 430 . 40 0.0045 440 2.0899 840 0.8349 1240 0.7161 1640 50 0.0209 450 2.3993 850 0.8659 1250 0.7142 1650 60 0.0461 460 3.1106 860 0.9193 1260 0.7134 1660 70 0.0891 470 4.0429 870 0.9467 1270 0.7175 1670 80 0.1453 480 4.5728 880 0.9568 1280 0.7154 1680 90 0.1945 490 4.1384 890 0.9666 1290 0.7146 1690 100 0.2361 500 3.1966 900 0.9721 1300 0.7187 1700 110 0.2709 510 2.7348 910 0.9712 1310 0.7166 1710 120 0.2998 520 2.4471 920 0.9755 1320 0.7158 1720 130 0.3386 530 2.2491 930 0.9783 1330 0.6811 1730 140 0.3840 540 2.1563 940 0.9760 1340 0.6294 1740 150 0.4159 550 1.9520 950 0.9796 1350 0.6037 1750 160 0.4377 560 1.6900 960 0.9819 1360 0.5866 1760 170 0.4572 570 1.5617 970 0.8740 1370 0.5825 1770 180 0.4726 580 1.5040 980 0.7193 1380 0.5806 1780 190 0.4830 590 1.4738 990 0.6421 1390 0.5754 1790 200 0.4947 600 1.4611 1000 0.5995 1400 0.5773 1800 210 0.5042 610 1.4252 1010 0.5825 1410 0.5784 1810 220 0.5101 620 1.3776 1020 0.5742 1420 0.5747 1820 230 0.5181 630 1.3556 1030 0.6379 1430 0.5773 1830 240 0.5247 640 1.3425 1040 0.7419 1440 0.5787 1840 250 0.5489 650 1.3417 1050 0.7943 1450 0.4322 1850 260 0.5841 660 1.3431 1060 0.8208 1460 0.2161 1860 270 0.6092 670 1.2767 1070 0.8344 1470 0.1081 1870 280 0.6321 680 1.1762 1080 0.6416 1480 0.0540 1880 .290 0.6486 690 1.1269 1090 0.8115 1490 0.0270 1890 300 0.6641 700 1.1074 1100 0.7585 1500 0.0135 1900 310 0.7693 710 1.0946 1110 0.7323 1510 0.0068 1910 320 0.9203 720 1.0892 1120 0.8514 1520 0.0034 1920 330 1.0095 730 1.0916 1130 0.7792 1530 0.0017 1930 340 1.0669 740 1.0896 1140 0.6155 1540 0.0008 1940 350 1.1077 750 1.0896 1150 0.6659 1550 0.0004 1950 360 1.1396 760 1.0946 1160 0.6871 1560 0.0002 1960 370 1.1421 770 1.0939 1170 0.6979 1570 0.0001 1970 380 1.1287 780 1.0945 1180 0.7078 1580 1960 390 1.1272 790 1.OZ96 1190 0.7087 1590 1990 400 1.1344 800 0.9276 1200 0.7094 1600 2000 8/20/04 2:59:54 pm Skillings Connolly, Inc page 7 WILLOW GLEN PHASE 3 JOB NO 04017 DETAIL HYDROGRAPH SUMMARY HYDROGRAPH No. 3 Peak runoff : 4. 0917 cfs Tota l Vol: 1.55 ac-ft TZME DESIGN TIME DESIGN TIME DESIGN TIME DESIGN TIME DESIGN RUNOFF RUNOFF RUNOFF RUNOFF RUNOFF (min) (cfs) (min) (cfs) (min) (cfs) (min) (cfs) (min) (cfs) ------- 10 --- - 410 1.0077 810 0.6306 1210 0.5364 1610 20 420 1.0089 820 0.6291 1220 0.5309 1620 30 430 1.5993 830 0.6288 1230 0.5308 1630 40 0.0091 440 2.2163 840 0.6290 1240 0.5369 1640 50 0.0377 450 2.2562 850 0.6765 1250 0.5314 1650 60 0.0720 460 3.1176 660 0.7321 1260 0.5313 1660 70 0.1333 470 4.0116 870 0.7356 1270 0.5374 1670 80 0.2034 480 4.0917 880 0.7312 1280 0.5318 1680 90 0.2460 490 3.0081 890 0.7376 1290 0.5318 1690 100 0.2804 500 1.8619 900 0.7383 1300 0.5379 1700 110 0.3085 510 1.8232 910 0.7330 1310 0.5323 1710 120 0.3319 520 1.7172 920 0.7391 1320 0.5322 1720 130 0.3810 530 1.6229 930 0.7397 1330 0.4844 1730 140 0.4334 540 1.6218 940 0.7343 1340 0.4343 1740 150 0.4520 550 1.3823 950 0.7404 1350 0.4314 1750 160 0.4638 560 1.1337 960 0.7410 1360 0.4245 1760 170 0.4812 570 1.1236 970 0.5871 1370 0.4299 1770 180 0.4926 580 1.1274 980 0.4379 1380 0.4301 1780 190 0.4982 590 1.1224 990 0.4293 1390 0.4242 1790 200 0.5111 600 1.1238 1000 0.4206 1400 0.4300 1800 210 0.5186 610 1.0789 1010 0.4254 1410 0.4303 1810 220 0.5208 620 1.0322 1020 0.4254 1420 0.4245 1820 230 0.5312 630 1.0312 1030 0.5205 1430 0.4303 1830 240 0.5364 640 1.0260 1040 0.6261 1440 0.4306 1840 250 0.5784 650 1.0327 1050 0.6324 1450 0.2268 1850 260 0.6215 660 1.0342 1060 0.6347 1460 0.0192 1860 270 0.6292 670 0.9362 1070 0.6357 1470 0.0064 1870 280 0.6420 680 0.8338 1080 0.6362 1480 0.0021 1880 _290 0.6450 690 0.8292 1090 0.5889 1490 0.0007 1890 300 0.6524 700 0.8340 1100 0.5333 1500 0.0002 1900 310 0.8283 710 0.8286 1110 0.5303 1510 1910 320 1.0033 720 0.8290 1120 0.7142 1520 1920 330 1.0177 730 0.8355 1130 0.5379 1530 1930 340 1.0305 740 0.8306 1140 0.3534 1540 1940 350 1.0422 750 0.8312 1150 0.5280 1550 1950 360 1.0530 760 0.8377 1160 0.5274 1560 1960 370 1.0212 770 0.8328 1170 0.5290 1570 1970 380 0.9875 780 0.8333 1180 0.5357 1580 1980 390 0.9890 790 0.7396 1190 0.5303 1590 1990 400 0.9958 800 0.6359 1200 0.5303 1600 2000 8/20/04 2:59:54 pm Skillings Connolly, Inc page 8 WILLOW GLEN PHASE 3 JOH NO 04017 ---- _________________ DETAIL HYDROGRAPH SUMMARY HYDROGRAPH No. 11 Peak runoff: 1.2413 cfs TINIS DESIGN TIME DESIGN TIME DESIGN RUNOFF RUNOFF RUNOFF (min) (cfs) (min) (cfs) (min) (cfs) 10 410 0.4062 810 0.4553 20 420 0.4104 820 0.4390 30 430 0.4146 830 0.4228 40 440 0.4346 840 0.4086 50 450 0.4910 850 0.3969 60 460 0.5735 660 0.3893 7p 470 0.6840 870 0.3876 BO 0.0003 480 0.8449 880 0.3904 90 0.0019 490 1.0379 890 0.3945 100 0.0059 500 1.1941 900 0.3987 110 0.0125 510 1.2413 910 0.4028 120 0.0214 520 1.2405 920 0.4063 130 0.0318 530 1.1942 930 0.4092 140 0.0437 540 1.1373 940 0.4119 150 0.0573 550 1.0810 950 0.4141 160 0.0720 560 1.0246 960 0.4159 170 0.0869 570 0.9598 970 0.4177 180 0.1014 580 0.8921 980 0.4139 190 0.1152 590 0.8316 990 0.3980 200 0.1282 600 0.7812 1000 0.3742 210 0.1402 610 0.7408 1010 0.3499 220 0.1513 620 0.7076 1020 0.3283 230 0.1615 630 0.6785 1030 0.3104 240 0.1708 640 0.6529 1040 0.2995 250 0.1794 650 0.6319 1050 0.2995 260 0.1882 660 0.6152 1060 0.3074 270 0.1984 670 0.6027 1070 0.3175 280 0.2094 680 0.5901 1080 0.3273 290 0.2201 690 0.5726 1090 0.3360 300 0.2300 700 0.5520 1100 0.3415 310 0.2387 710 0.5330 1110 0.3417 320 0.2506 720 0.5170 1120 0.3379 330 0.2710 730 0.5039 1130 0.3397 340 0.2971 740 0.4938 1140 0.3435 350 0.3229 750 0.4862 1150 0.3345 360 0.3464 760 0.4804 1160 0.3220 370 0.3667 770 0.4764 1170 0.3160 380 0.3830 780 0.4736 1180 0.3130 390 0.3942 790 0.4715 1190 0.3118 400 0.4012 800 0.4669 1200 0.3115 TOt~ TIME (min) 1210 1220 1230 1240 1250 1260 1270 1280 1290 1300 1310 1320 1330 1340 1350 1360 1370 1380 1390 1400 1410 1420 1430 1440 1450 1460 1470 1480 1490 1500 1510 1520 1530 1540 1550 1560 1570 1580 1590 1600 ~1 Vol DESIGN RUNOFF (cfa) 0.3114 0.3116 0.3119 0.3121 0.3125 0.3129 0.3132 0.3136 0.3140 0.3142 0.3146 0.3150 0.3153 0.3137 0.3081 0.2998 0.2914 0.2838 0.2777 0.2726 0.2686 0.2657 0.2633 0.2615 0.2603 0.2519 0.2270 0.1912 0.1554 0.1237 0.0973 0.0759 0.0589 0.0456 0.0352 0.0272 0.0209 0.0161 0.0124 0.0096 0.79 ac-ft TIME DESIGN RUNOFF (min) (cfs) 1610 0.0074 1620 0.0057 1630 0.0044 1640 0.0033 1650 0.0026 1660 0.0020 1670 0.0015 1680 0.0012 1690 0.0009 1700 0.0007 1710 0.0005 1720 0.0004 1730 0.0003 1740 0.0002 1750 0.0002 1760 0.0001 1770 0.0001 1780 1790 1800 1810 1820 1830 1840 1850 1860 1870 1880 1890 1900 1910 1920 193 0 1940 1950 1960 1970 1980 1990 2000 8/20/04 2:59-54 pm Skillings Connolly, Inc page 9 WILLOW GLEN PHASE 3 JOB NO 04017 DETAIL HYDROGRAPH SUMMARY HYDROGRAPH No. 12 1.93 ac-ft Peak runoff- 1.2427 cfs Total Vol: TIME DESIIN TIME DfiSIGN TIME DfiSZGN TIME DSSIQI TZIKB DfiSIGaI RUNOFF RUNOFF RUNOFF RUNOFF RUNOFF (min) (cfs) (mia) (cfs) (min) (cfs) (min) (cfs) (min) (cfs) __________________________________________________ 10 410 1.0618 810 1.2426 1210 1.2415 1610 0.0167 20 420 1.0802 820 1.2426 1220 1.2415 1620 0.0128 30 430 1.0972 830 1.2425 1230 1.2414 1630 0.0099 40 440 1.1542 840 1.2425 1240 1.2414 1640 0.0076 50 0.0005 450 1.2413 850 1.2425 1250 1.2414 1650 0.0058 60 0.0033 460 1.2414 860 1.2425 1260 1.2413 1660 0.0045 70 0.0103 470 1.2415 870 1.2424 1270 1.2248 1670 0.0035 80 0.0235 480 1.2416 880 1.2424 1280 1.1073 1680 0.0027 90 0.0451 490 1.2416 890 1.2424 1290 1.0172 1690 0.0020 100 0.0739 500 1.2420 900 1.2424 1300 0.9475 1700 0.0016 110 0.1065 510 1.2422 910 1.2424 1310 0.8943 1710 0.0012 120 0.1404 520 1.2423 920 1.2424 1320 0.8536 1720 0.0009 130 0.1738 530 1.2424 930 1.2423 1330 0.8219 1730 0.0007 140 0.2073 540 1.2424 940 1.2423 1340 0.7934 1740 0.0006 150 0.2428 550 1.2425 950 1.2423 1350 0.7616 1750 0.0004 160 0.2791 560 1.2425 960 1.2423 1360 0.7281 1760 0.0003 170 0.3131 570 1.2426 970 1.2423 1370 0.6975 1770 0.0003 180 0.3441 560 1.2426 980 1.2422 1380 0.6714 1780 0.0002 190 0.3719 590 1.2426 990 1.2422 1390 0.6507 1790 0.0001 200 0.3963 600 1.2426 1000 1.2422 1400 0.6340 1800 0.0001 210 0.4177 610 1.2426 1010 1.2421 1410 0.6207 1810 220 0.4365 620 1.2427 1020 1.2421 1420 0.6108 1820 230 0.4528 630 1.2427 1030 1.2421 1430 0.6029 1830 240 0.4669 640 1.2427 1040 1.2420 1440 0.5967 1840 250 0.4795 650 1.2427 1050 1.2420 1450 0.5924 1850 260 0.4927 660 1.2427 1060 1.2420 1460 0.5723 1860 270 0.5097 670 1.2427 1070 1.2419 1470 0.5151 1870 280 0.5298 680 1.2427 1080 1.2419 1480 0.4337 1880 .290 0.5507 690 1.2427 1090 1.2419 1490 0.3524 1890 300 0.5714 700 1.2427 1100 1.2419 1500 0.2805 1900 310 0.5910 710 1.2427 1110 1.2418 1510 0.2205 1910 320 0.6200 720 1.2427 1120 1.2418 1520 0.1720 1920 330 0.6718 730 1.2427 1130 1.2418 1530 0.1335 1930 340 0.7394 740 1.2427 1140 1.2417 1540 0.1033 1940 350 0.8083 750 1.2427 1150 1.2417 1550 0.0798 1950 360 0.8726 760 1.2426 1160 1.2417 1560 0.0615 1960 370 0.9305 770 1.2426 1170 1.2416 1570 0.0474 1970 380 0.9790 780 1.2426 1180 1.2416 1580 0.0365 1980 390 1.0151 790 1.2426 1190 1.2416 1590 0.0281 1990 400 1.0411 800 1.2426 1200 1.2415 1600 0.0216 2000 8/20/04 2:59:54 pm Skillings Connolly, Inc page to WILLOW GLEN PHASE 3 JOB NO 04017 STAGE STORAGE TABLE CUSTOM STORAGE ID No. S1 Description: STORAGE STAGfi <----STORAGE----> STAGE <----STORAGfi----> STAGfi <----STORAGE----> STAGE <----STORAGE----> (ft) ---cf--- --AC-Ft- (ft) ---cf--- --Ac-Ft- (ft) ---cf--- --Ac-Ft- (ft) ---cf--- --Ac-Ft- __________________________________________________ 330.00 0.0000 0.0000 330.30 8573 0.1968 330.60 17147 0.3936 330.90 25720 0.5904 330.10 2858 0.0656 330.40 11431 0.2624 330.70 20004 0.4592 331.00 28577 0.6560 330.20 5716 0.1312 330.50 14289 0.3280 330.80 22862 0.5248 8/20/04 2:59:54 pm Skillings Connolly, Inc page 11 WILLOW GLEN PHASE 3 JOB NO 04017 STAGE DISCHARGE TABLE DISCHARGE LIST ID No. Dl Description: DISCHARGE STAGE (ft) <--DISCHARGE---> ---cfs-- STAGE (ft) <--DISCHARGfi---> STAGfi cfa-- (ft) --- ------- <--DISCHARGE---> STAGE ---cfs-- ------- (ft) <--DISCHARGE---> ---cfa-- ------- ______ 330.00 330.10 __________________ 1.2410 1.2413 _________ 330.30 330.40 _________ 1.2419 1.2422 330.60 30.70 1.2428 .2431 30.90 331.00 .2437 1.2440 330.20 1.2416 330.50 1.2425 330.80 1.2434 8/20/04 2:59:57 pm Skillings Connolly, Inc page 12 WILLOW GLEN PHASE 3 JOB NO 04017 LEVEL POOL TABLE SUMMARY MATCH INPIAW -STO- -DIS- <-PEAK-> OUTFLOW STORAGE <--------DESCRIPTION---------> (cfs) (cfs) --id- --id- <-STAGE> id (cfa) VOL (cf) ------------ A-2 YR 0.00 1.79 S1 Dl 330.10 11 1.24 2890.64 cf A-100 YR ..................... 0.00 4.57 S1 D1 330.57 12 1.24 16215.52 cf APPENDIX C Supporting Documentation Soils Map Soils Data Soil Log Map SKILLINGS-CONNOLLY, INC. Willow Glen Phase Ill Subdivision Consulting Engineers Storm Drainage Analysis & Report SKILLINGS WILLOW GLEN PHASE III SUBDIVISION CONNOLLY SCS SOILS MAP Thurston GeoDATA Center/Interactive Map Page 1 of 1 Map Produced By: Thurston GEODATA Center's Internet Map Server Scale: Approx. lInch = 222 Feet 4/29/2004 10:40:11 AM sn~~~y yi tia,leLCy1 S'~ [p a ~+~. p ~ 3 .(a n ,...,. 3 ~ ~5 % http://198.187.3.116/scripts/esrimap.dll?name=TGCMAP&Left=1116623.9310514&Botto... 4/29/2004 ~ . ~~:' _` -i ~7hurston County. Washington a ^~ eluded areas make up about 10 percent of the tots s: , / >,~;;,a ogee. J er^~eability is moderately rapid in the Spana soil. _'= Ava acle water capacity is moderate. Effective roJ~ting -.dept is 20 to 40 inches. A seasonal high water able is ~: ~"' at a d~ th of about 12 to 36 inches from Nove ber to ~ =.,; April, ~noff is slow, and the hazard of water rosion is :.~ slight ~~ '` = Most a eas are used as hayland and past re. This ^~unit is suit d to hay and pasture. The main imitations Fare the sea , onal high water table and the oderate available wa r capacity. Proper stocking ales, pasture ~: f rotation. and stricted grazing during w~ t periods help to keep the pa lure in good condition and protect the soil from erosio .Rotation grazing hel s to maintain the quality of forage. Periodic mowing he~s to maintain uniform growth, courages selectiv grazing, and controls weeds. In ost years irrigon is needed for maximum productio .Sprinkler irrigation is the best method of applying ater. The ar~`ount of water applied should be sufficient t wet the root zone but small enough to minimize th leaching of plant nutrients. A few areas are use as wdodland. On the basis of a 100-year site curve, the stinfated site index for Douglas-fir is 144. On the b Isis of a 50-year site curve. it is 110. The estimated gr th rate of an unmanaged. even-aged stand of Dougl fir is 150 cubic feet per acre per year at 60 year of ge. ':,;.The main limitation a ectin the harvesting of timber is the muddiness taus d by s sonal wetness. Use of wheeled and tracked quipmen when the soil is wet .results in ruts ands compactio . Unsurfaced roads and skid trails are s ft and can b impassable when wet. Logging road require suitabl surfacing material ~~ for year-round us .Rounded pebbi and cobbles for -~:~oad constructio are readily availabl on this unit. The seasonal high ter table limits the u of equipment to -dry periods. Di turbance of the protecti a layer of duff -rte ' can be minim' ed by the careful use of heeled and ~'~~ tracked equi meat. Seedling stablishment is the main con ern in the `- production f timber. Reforestation can be accompli ed by planting Douglas-fir seedli s. If the stand includes seed trees. natural reforestati by red alder oo~urs periodically in cutover areas. The easonal high water table inhibits root respiration and thus results in some seedling mortality. When openings are ~ade in the danopy, invading brushy plants can prevent t establishment of planted Douaias-fir seedlings. ommon forest understory plants are cascade egon-grape. saiai, vine maple, western brackenfe nd Cregon white oak. 89 -T1'fii~rrra~a nlt-~is=irr~c2~i~ilit~salj~. 110-Spanaway gravelly sandy loam, 0 to 3 percent slopes. This ver;i deep. sor-ewhat excessively drained soil is on terraces. It formed n glacial ourNash and volcanic ash. The naive vegeta?`on is mainly grasses. ferns. and a few conifers. E:ovation is 1 GO to 400 feet. The average ar.nuai precipitation is 45 to 55 inches, the average annul air tempe-ature is abcut 51 degrees F, and the averace frost-free gericd is 150 to 200 days. Typically, the surface .aver is blac:c gravelly sandy loam about 15 inches thic;<. The sucsail is dark yellowish brown very gravelly loam acout 5 inches thick. The substratum to a dep?~ of 60 inc:es or more is dark yellowish brown extremely gravelly sand. Included in this unit are small areas of Alderwcod soils on till plains; Everest. Indianola. 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. Included areas make un about 20 percent of the total acreace. Permeability is moderately rapid in the subsoil of the Spanaway sail and very rapid in the substratum. Available water capacity is low_ Effective rooting depth is 60 inches or more. Runoff is stow. 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. v The main limitation affecting hay and pasture is the low available water capacity. Proper crazing practices. weed control, and fertilizer are needed to ensure maximum quality of forage. Rotation crazing helps to maintain the quality of forage. Feriocic mowing helps to maintain uniform growth, discourages selective grazing, and controls weeds. Animal manure can be applied periodically during the growing seascn. Areas that receive heavy applications should be narrowed at 'east once a year. In summer. irrigation is ~2eded for maximum production of most forage crops. Sprinkler irrigation is the best method of applying water. The amount of water applied should be s~:~icient to we*. the root zone but small enouc_h to minim,~e the leaching of plant nutrients. This unit is suited to c:cos. `Nheat. pats. strawberries.:aspberries. ~lackcerries. and sweeT corn are commonly grown. Thy main limitat:on is the Ic~.v available water capacity..n summer. rriaa?ion is needed for maximum prco:action of r~cst c: oes. 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 enouoh 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. In 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. If 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 50-year site curve, it 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 this unit. Disturbance of the protective layer of duff can be minimized by the careful use of wheeled and tracked equipment. Seedling establishment and seedling mortality are the main concerns in the production of timber. Reforestation can be accomplished by planting Douglas-fir seedlings. If the stand includes seed trees, natural reforestation by Douglas-fir, Oregon white oak, and lodgepole pine occurs periodically in cutover areas. Droughtiness in the surface layer reduces the seedling survival rate. When openings are made in the canopy, invading brushy plants can delay the establishment of planted Douglas- fir seedlings. Common forest understory plants are cascade Oregon-grape, salal, western brackenfern, western swordfern, Indian plum, and Scotch-broom. Soil Survey This map unit is in capability subclass IVs. 11 i-Spanaway gravelly sandy loam, 3 to 15 percent slopes. This very deep, somewhat excessively drained soil is on terraces. It 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 sandy loam about 5 inches thick. The substratum to a depth of 60 inches or more is dark yellowish brown extremely gravelly sand. Included in this unit are small areas of Alderwood soils on till plains and Everett. Indianola, and Nisqually soils on terraces. 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 0 to 3 percent. Included 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 stow, and the hazard of water erosion is slight. This unit is used mainly as hayland or pasture, 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 during the growing season. 't 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 (east once a year. In 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 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 and cobbles should 's be removed, particularly in areas used for lawns. In p ~k } nI' Thurston County, Washington 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. If the density of housing is moderate or high, community sewage systems are needed to prevent the contamination of water supplies caused by seepage ~n`~: from onsite sewage disposal systems. The slope ~~'~ hinders the installation of the absorption fields. ~`~`' Absorption lines should be installed on the contour. ~s~':5, Douglas-fir is the main woodland species on this unit. .~v, "~ "Among the trees of limited extent are Oregon white oak. ' ~~_< ` e;~x 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 + sbouglas-fir is 140. On the basis of a 50-year site curve, ~~ it is 108. The highest average growth rate of an -~ ~` ~~~` y4 unmanaged, even-aged stand of Douglas-#ir 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 s ~ roads require suitable surfacing material for year-round ~~: use. Rounded 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. y;- Seedling establishment and seedling mortality are the ~' main concerns in the production of timber. Reforestation s can be accomplished by planting Douglas-fir seedlings. ~~ ~.:` If the stand includes seed trees, natural reforestation of ~~~ cutover areas by Oregon white oak and lodgepole pine x~'. occurs infrequently. Droughtiness in the surface layer ,TM` .reduces the seedling survival rate. When openings are 'y>". made in the canopy, invading brushy plants can delay .the establishment of planted Douglas-fir seedlings. ~; Common forest understory plants are cascade `'-" Oregon-grape, salal, western brackenfern, western swordfern, Indian plum, and Scotch-broom. This map unit is in capability subclass IVs. ~''1~1-2-Spanaway stony sandy loam, 0 to 3 per slopes. This vet deep, some~.vhat exces drained soil is on terraces.lt~#orfned in gl outwash and volcanic ash. The native at;ion is mainly grasses. ferns. and a few ers. Elevation i~~~0 to 400 feet. The aver annual precipitation is 40 to 5~°inc,hes, the a age annual air temperature is about 51 decree 01 nd the average frost-free period is 150 to 200 days,:' Typically, the surface layer is black stony sandy loam a out 16 inches thick. The subsoil is very dark broyvn gr velly sandy loam about 6 inches thick. The ~~ sub tratum to a depth of 60 inches or more is gri~yish brow ~ extremely gravelly sand. ~ Included in this unit are small areas of Alderwood soils on`till plains, Bafdhill soils on terminal moraines, and Eve~ett, Indianola, 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 S noway stony sandy loam that have slopes of 3 to 15 p~~cent. Included areas make;-up about 15 percent of th total acreage. c Permeabilit is moderately rapid in the subsoil of the Spanaway soil nd very rapid in the substratum. Available water pacity is low. Effective rooting depth is 60 inches or m re. Runoff is stow; and the hazard of water erosion is sli ht. This unit is used ainly for hayjand, pasture, or homesites. The main limitations affecting hay and pasture are the low a ilable water capacity and the stones on the surface. roper grazing practices, weed control, and fertilizer are needed to ensure maximum quality of forage. Rotatio gr,~zing helps to maintain the quality of the forage. Beca se of the surface stones, spreading animal manure„ owing, and seeding are difficult. In summer, irrigatio is needed for maximum production of most fora cro s. Sprinkler irrigation is the best method of app~ng w ter. The amount of water applied should be suffjcient to et the root zone but small enough to minignize the le hing of plant nutrients. f/ This unit is well suited to homes es. Pebbles, cobbles, and ston ~s should be rem ved, particularly in areas used for la~nins. In summer, irri ation is needed for lawn grasse ,shrubs, vines, shad trees, and ornamental tre~s. Mulch, fertilizer, and 'rrigation are needed to establish lawn grasses and o er small- seeded plants. Cutbanks are not stable a d are subject to sloughing: The main limitation affecting septic tank bsorption fields is a/poor filtering capacity in the subst tum. If the density a# housing is moderate or high, coma! nity sewaae~systems are needed to prevent the conta~ination of water supplies caused by see age from mnsite sewage disposal systems. Tf7is map unit is in capability subclass IVs. 7f 3-Spanaway stony sandy loam, 3 to 15 per ent s pes. This very deep, somewhat excessively drain d it is on terraces. It formed in glacial outwash and 1 J it Spanaway Series Tee Spanaway series consists or very deer, som=what excessively drained soils on terraces. Tnese soils formed in glacial cutwash and volcanic ash. Slope is 0 :., 15 percent. Elevation is 100 to -+00 fee:. Thy average annual precipitation is 40 to 55 inches, the average annual air temperature is about 51 decrees =, and :ne average frost-free season is 150 to 200 da:~s. These soils are sandy-skeletal, mixed. meslc Andic Xerumbrepts. Typical pedon of Spanaway gravelly sandy loam. 0 to 3 percent slopes. 4 miles southeast of Lacey: about 250 feet ~:~est and 400 feet south of the northeast corner of sec. 25. T. 36 N., R. 1 W. A-0 to 15 inches: black (10YR 2!1) gravelly sandy loam, very dark grayish brown (10YR 3/2) dry: v~reak fine granular structure: loose, very friable. nonsticky and nonplastic: many fine, medium, and coarse roots: 25 percent pebbles: strongly acid; clear smooth boundary. Bw-15 to 20 inches; dark yellowish brown (1 OYR 3~4) very gravelly sandy loam, light olive brown (2.SY 5 4) dry: weak fine subangular blocky structure: loose, very friable, nonsticky and nonplastic; many fine, medium. and coarse roots: 55 percent pebbles; medium acid: clear smooth boundary. C-20 to 60 inches; dark yellowish brown (10YR 4!4) extremely gravelly sand, yellowish brown (10YR 5 4) dry: single grained; loose; few fine roots; 80 percent pebbles, 10 percent cobbles: slightly acid. The thickness of the solum ranges from 15 to 25 inches. The content of coarse fragments in the control section ranges from 50 to 85 percent. The weighted average texture of this section is very gravelly sand or extremely gravelly sand. The umbric epipedon is 10 to 20 inches thick. The A horizon has hue of 10YR or 7.5YR, value of 3 or 4 when dry, and chroma of 1 or 2 when moist or dry. It is medium acid or strongly acid. The Bw horizon has value of 4 or 5 when dry and 3 or 4 when moist. It is very gravelly sandy loam, very gravelly loam, or extremely gravelly sandy loam. The C horizon has hue of 10YR or 2.5Y, value of 5 or 6 when dry and 4 or 5 when moist, and chroma of 3 or 4 when dry or moist. It is extremely gravelly sand or extremely gravelly loamy sand and is slightly acid or neutral. Soll SUfVe~~ ~r~ell drained soils on flood plains. These soils formed in alluviu^:. Slope ~s 0 to 3 percent. elevation is 20 to 75~ 'eet. The average annual precipitation is 40 to 50 aches. the average annual air temperature is about.50 ~earees r, and the average frost-free season is 150 to .00 days. These soils are fine-silty, mixed, nonacid, mesrc ~+quic Xerofluvents. Typical pedon of Sultan silt loam, 7 miles east of acey: about 1 ,000 feet east and 1,975 feet north of the southwest corner of sec. 16, T. 18 N., R. 1 ~: i' =gyp-0 to 7 inches; dark yellowish brown (1~OYR 3/4) silt loam, brown (10YR 5/3) dry; moderate fine and medium granular structure; slightly hard, very friable, slightly sticky and slightly plastic; many fine, medium, and. coarse roots; many very fine and fine tubular pores;,, slightly acid; abrup 'smooth boundary. 5A-7 to 20 inches; dark yellowish gown (10YR 4/4) silt loam, brown ~(10YR 5/3) dr~i; moderate fine and medium subangular blocky structure; slightly hard, very friable, slightly sticky grid slightly plastic; many .i very fine, fine, and medium'`roots; many very fine and fine tubular pores; slightly acid; clear wavy s boundary. 't Bw1-20 to 25 inches; dark~~brown (10YR 3/3) silt loam„` grayish brown (2.5Y 5L2) dry; common fine { prominent red (2.5YRfh5/8) mottles; moderate fine and medium subang~'ilar blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; common fine and medium roots; common very fine and fine tubular pores; slightly acid; gradual wavy boundary. 1 Bw2-25 to 45 inches; dark brown \(10YR 4/3) silt loam, light brownish,jgray (10YR 612) dry; common u~ medium prom"inept red (2.5YR 5/8) mottles; moderate medium and coarse subangular blocky structure; slightly hard, very friable;`, slightly sticky ~~' and slightly plastic; few very fine and fine roots; few very fine;•'and fine tubular pores; slightly acid; gradual,~wavy boundary. '~~ C-45 to 60 inches; grayish brown (10YR 5/2) silt loam, ;~~ light gray (10YR 7/2) dry; common medium prominent dark brown (7.5YR 4/4) mottles; massive: slightly hard, very friable, slightly sticky aria slightly - plastic; slightly acid. `F ~,' ~~ T e soils are slightly acid or neutral in the coritrol se ion and range from slightly acid to strongly acid b ow a depth of 40 inches. Mottles that have chrorcna ~3 or more are at a depth of more than 20 inches. ~` ,~ ., 26~ TP.~LL 14.--Etv'GINE~~`0 It:D~ =POP~TIES--Continued Soil Survey ~las~__~cauor. ;Frag- ; >/ercentage passing i i ~Oi•: :1dmE aIId i~°Dt-,i USA:. texture j i imeatS ; sieve number-- ;Liquid ~ Pla£- mar svmbo-_ ', ; Lnifie AASi?TC ; > ~ ; , , ; ; limit ; ticity ,i~c~es, 4 , 10 , 40 , 00 , , index In , ~ ; - , , , , Pct , - . ~ ~ ~ , , I , , , 1110, ==1---------; 0-15;Grav~'_ly sands ;G?'., SM ;k-:, A-= ; C•-5 ;55-85 ;50-75 ;30-50 ;15-25 ; 35-50 ; NP-10 SDan3~ay ; ; loin. ' ' ' ' ' ~_.. ;15-2C;Ver-.• gravelly ;GM ;F.-1, k-= ; C•-10 ;35-55 ;25-50 ;15-45 ;10-35 ; 35-50 ; NP-10 ~.,.,_~._._~... ; ; loan, ve_. i ~ , , 1 ~ 1 I , '~' i i i , , i I I I 4raC=fly sandy i i i i i i i i i , I I I I , 1 , i loa`., extremely , , , , , , , , , gravelly Sandy , ~ i , ~ , ~ ~ ~ ~ loam. ~ I , , 1 , , t , ~ ~ ~ ~ , I , , , , , 20-6C;Extremely ;GP, GW ;A-1 ;10-25 ;25-35 ;20-30 ;10-20 ; 0-5 ; --- ; NP , , gravelly SdIld, , , , , , , , , , I 1 , I 1 I I I I I I , , ex:. emely , , , , , , , , , ~ i , , 1 , , , , , , , , gravelly loamy , , , , ,. , , , , , ' sane. ' ' ' ' ' ' ' ' ' ~ i I , , , , 1 I I , i ~ I , 1 I , 1 , 1 1 i , , I 1 I , 1 , , , 112, 113---------; 0-16;Ston~ sandy loam ;SM ;A-2 ; 5-20 ;70-90 ;60-80 ;40-50 ;25-35 ; 35-50 ; NP-10 Spanas~ay 116-22;Ven- gravelly ;GM ;A-1, A-2 ; 0-10 ;35-55 ;25-50 ;20-40 ;10-30 ; 35-50 ; NP-10 ~ , , , , I , 1 I , , , , loam, very , , , , , , , , , ~ gravelly sandy , i i i i i i i i i , , , I , , 1 1 1 1 , , loam, extremely , , , , , , , , , ~ gravelly sandy i i i i i i i , loan. , 1 I , 1 1 1 1 1 ~ , 1 , , , , , 1 ~ , X22-60~Ext=emely ~GP, GW ~A-1 110-25 X25-35 120-30 X10-20 i 0-5 i --- i NP , , 1 , , 1 I , I , , , , gravelly sand, , , , , , , , , , , i I , , , I I I , , , , extremely , , , , , , , , , ~ I , I , 1 , 1 , , , , , gravelly loamy , , , , , , , , , I , sang. I , 1 , 1 1 1 1 1 ~ , I I I , , , 1 , , I , , , , I , , I I 1 I , , , , I I I I , 1 ~ ~ , 1 , 1 I I 1 , 1 114*: I I I , 1 I , , 1 , , Spana~:ay--------; 0-15;Gravelly sandy ;GM, SM ;A-1, A-2 ; G-5 ;55-85 ;50-75 ;30-50 ;15-25 ; 35-50 ; NP-10 ~ , loa=. , 1 I I , , I , I ~ , 1 I , 1 1 1 I , , 15-2C;Very gravelly ;GM ;A-1, A-2 ; 0-10 ;35-55 ;25-50 ;15-45 ;10-35 ; 35-50 ; NP-10 ~ I , , , 1 , , I 1 , , , loam, very , , , , , , , , , gravelly sandy i i i i i i i i , , 1 , 1 , I 1 1 1 , , loa=., extremely , , , , , , , , , , , 1 1 , t I 1 1 1 , , , gravelly sandy , , , , , , , , , , I loam. 1 , , I , , 1 1 1 , , I I I I 1 , 1 , 20-6C~Extremely ,GP, GW iA-1 ,10-25 ,25-35 X20-30 ,10-20 { 0-5 ~ --- ~ NP ~ ~ 1 1 , , 1 , I , 1 , , gravelly sandy , , , , , , , , , i , , , , 1 1 1 , , , , , ext=emely , , , , , , , , , I I 1 1 , , I , 1 1 , , , gravelly loamy , , , , , , , , , ~ , san?. , , 1 1 1 , 1 I I i i I , , , , , I , , , i 1 , , I 1 1 I , 1 Niscually-------; 0-5 ;Loamy fine sand ;SM ;A-2 ; 0 ; 100 ; 100 ;50-80 ;15-30 ; --- ; NP 5-31;Loa~- sane, loamy;SM ;A-2 ; 0 ; 100 ; 100 ;60-80 ;20-30 ; --- ; NP , ~ I , , I I I I I , , , fin_ sand. , , , , , , , , , 31-60;Loamc fine sand, ;SP-SM, _!! ;A-3, A-2 ; 0 ; 100 ; 100 ;65-75 ; 5-20 ; --- ; NP ~ ~ 1 I , , I 1 1 1 I , , lOZ:.y Sand, , , , , , , , , , ~ ~ sang. , , I , 1 1 I 1 I ~ ~ , ~ I , , , , , , ~ ~ , ~ I , , 1 1 I 1 ~ ~ , , I I , ~ , , ~ 115--------------; 0-7 ;Silt loam--------;ML ;A-4 , 0 ; 100 ; 100 ,80-90 ;70-80 ; 20-30 i NP-5 Sultan ; 7-6C;Silt loam, silty ;CL-ML, ;A-4, A-5 ; 0 ; 100 , 100 ;95-100;80-90 , 25-35 , 5-15 ~ ~ , , 1 I I I , 1 1 , , Cla_r loam. , , , , , , , , , ~ i , I I i , , I I 1 116--------------, 0-7 Silt loam--------,ML, OL iA-4 i 0 ~ 100 ~ 100 190-100170-90 , 30-40 ~ NP-10 Taco~a ; 7-SC;Si1: loam, very ;ML ;A-4 ; 0 ; 100 ; 100 ;95-100;85-95 ; 25-35 ; NP-10 I I T,o 1 I 1 I 1 1 1 I 1 fi~_ sandy loam., , , , , , , , , 50-6C;Silt loam, silty ;CL iA-6, A-7 ; 0 ; 100 ; 100 ;95-100;90-100; 30-50 ; 10-25 Cla: loam, Clay.i i i i i i i i ~ i , 1 i I I , , , 1 I i , , i i , , , 1 , I See footnote at end of amble. Thurston County. Washington 273 TABLE 15.--PHYSICAL AND CHEMICAL PP.OP~TIES OF THE SOILS--Continued ~ ~ , , , , Erosion , ~ Soil name and ;Depth; Clay ; Permeability ; Available ; Soil ; Shrink-swell ; factors ;.Organic - - map symbol ; ; ; i water capacity ;reaction; potential ; , ~ ; matter K i T In , Pct , In/hr , In in , off , , , , Pct 109--------------i 0-22; 7-15 , 2.0-5.0 ; 0.12-0.14 ;5.6-5.0 ;Low------------;0.24; 5 ; 5-15 Spana ;22-26; 5-15 ; 2.0-5.0 i 0.14-0.17 ;5.6-5.0 ;Low---________-;0.17; 26-38; 5-15 ~ 2.0-6.0 i 0.09-0.12 ;5.6-6.0 ;Low--- -;0.10; ~ 38-60, 2-5 , 6.0-20 , 0.05-0.08 ,5.6-6.0 ,Low------------10.05 ~110, 111---------i 0-15, --- i 2.0-6.0 ~ 0.11-O.I3 ,5.1-6.0 ;Low------------10.15; 2 , 5-15 ~ Spanaway ;15-20; --- ; 2.0-6.0 i 0.09-O.I2 ;5.1-5.5 ;Low------------;O.lO -"""""~`~ ;20-60; ,,._.-T-y -.-~ 0-5 ; >20 ; 0.03-0.05 ;6.1-7.3 ;Low------------;0.02; ~ 112, 113---------i 0-16, --- ; 2.0-6.0 ; 0.11-0.13 ;5.1-6.0 ;Low------------;0.15; 2 ; 5-15 Spanaway ;16-22; --- ; 2.0-6.0 ; 0.09-0.12 ;5.1-6.5 ;Low------------;O.lO 22-60, 0-5 , >20 , 0.03-0.05 ,6.1-7.3 ,Low------------10.02 114*: i i Spanaway--------i 0-15; --- ; 2.0-6.0 ; 0.11-0.13 ;5.1-5.0 ;Low------------;0.15, 2 ; 5-15 15-20; --- ; 2.0-6.0 ; 0.09-0.12 ;5.1-6.5 ;Low------------;0.10; 20-60, 0-5 ; >20 ; 0.03-0.05 ,6.1-7.3 ;Low------------;0.021 Nisqually-------; 0-5 ; 0-5 ~ 2.0-5.0 ; 0.09-0.12 ;5.6-6.5 ;Low------------;0.20; 5 ; 3-10 i ~ 5-31i 0-5 i 2.0-6.0 { 0.08-0.12 i5.6-5.5 iLow------------0.28 ! ,31-60; 0-5 ~ >20 ; 0.04-0.07 ;6.1-7.3 ;Low------------;0.24; 115--------------i 0-7 ; 15-20 ; 0.6-2.0 ; 0.18-0.20 ,6.1-7.3 ;Low------------;0.37; 5 i 5-10 Sultan ; 7-60; 20-30 ; 0.6-2.0 i 0.18-0.20 ;6.1-7.3 ;:Moderate-------;0.321 116--------------i 0-7 ~ 5-18 , 0.6-2.0 i 0.25-0.35 ,3.6-5.5 ~LOw------------,0.28, 5 ~ 10-20 Tacoma ; 7-50; 5-18 ; 0.2-0.6 ; 0.20-0.30 ;3.6-5.5 ;Low------------;0.32; 50-60; 20-50 ; 0.2-0.6 ; 0.19-0.21 ;3.6-5.0 ;Moderate-------;0.32; i i i i i i i i I 117, 118, 1I9----; 0-11; 10-15 ; 0.6-2.0 ; 0.12-0.14 ;5.1-5.0 ;Low------------;0.20; 2 ; 5-10 Tenino ;11-36; 10-15 ; 0.6-2.0 ; 0.12-0.14 ;5.1-6.0 ;Low------------;0.20; 36-40, --- , --- , --- , --- ,---------------;----i 40-60; 2-10 , >20 ~ 0.06-0.07 ,5.1-5.0 ;Low------------,0.02, 120--------------i 0-lli --- i 0.6-2.0 , 0.25-0.35 ,5.6-7.3 ,Low------------;0.281 5 ; 3-10 Tisch ;11-50; --- ; 0.2-0.6 ; 0.25-0.35 ;5.6-7.3 ;Low------------;0.28; 50-60, --- , 0.6-2.0 ; 0.30-0.40 ;5.6-7.3 ;Low------------,0.00, 121, 122---------i 0-10; --- ; 0.6-2.0 ; 0.25-0.35 ;5.1-6.0 ;Low------------;0.24; 3 ; 5-10 Vailton ;10-15; --- ; 0.6-2.0 ; 0.25-0.35 ;5.i-5.0 ;Low------------10.24; ,15-48, --- , 0.6-2.0 , 0.20-0.30 ,5.1-6.0 ,Low ,0.15, , ~ 48 , --- , --- i --- i --- i------------° -i---- 123, 124---------i 0-11, 10-25 ~ 0.6-2.0 ; 0.17-0.20 ;5.1-6.0 i ;Low------------10.32; 5 { 5-10 Wilkeson ;11-47; 25-35 ; 0.6-2.0 ; 0.12-0.17 ;5.1-5.0 ;Moderate-------;0.20; 47-60; 18-35 ; 0.6-2.0 ; 0.15-0.20 ,5.1-6.0 ;:Ioderate-------i0.20 125. Xerorthents ; ; ~ ~ i 126, 127, 128----; 0-8 ; --- ; 2.0-6.0 ; 0.25-0.35 i5.6-6.5 iLow------------10.32; 5 ; 3-? Yelm ; 8-46; --- ; 2.0-5.0 ; 0.15-0.25 ;5.6-6.5 ;Low------------;0.32; ~' ,46-50, 0-5 ; 6.0-20 ; 0.04-0.09 ;5.6-5.5 ;Low------------iO.lO * See description of the man unit for composition and behavior characteristics of the map unit. Thurstcn County, Washington TABLE 16.--WATER FEATiTRES--Continued 277 Flooding , High water table Soil name and ;Hydrologic; , , , , ~ map symbol ; croup ; Frequency ; Duration ; Months ' ' ~ ~ ~ ~ ~ Depth i Kind ~ Months ~ ~ ~ ~ i ~ ~ i i i , Ft , , i i i i i - i i i i i i i i i 100, 101----------------; D ;None------------; --- ; --- ; 0.5-1.5 ;Perched ' u Nov-:.ar Scamman ' ' ' ' ' ~ , i i ~ ~ ~ , , ~ i i ~ ~ i ~ i ~ i ~ ~ ~ , _ ~ ___ 102, 103----------------; B ;None------------; --- ; --- ; >6.0 ' Schneider ' ' ' ' ! ~ i i i i 104---------------------; C ~ ~ i i i i i i ;Rare------------; --- ; --- Semiahmoo ' i ' ' ' i i ~ 105---------------------; D ;None------------; --- Shalcar ' i i ' ' ' i i i i i i i 106---------------------; D i i i ;Occasional------;Long----------; Nov-May Shalcar Variant i i 107, 108----------------; D i i i i i i ;None------------; --- ; --- Skipopa ; i ; ~ ~ ~ ~ ~ i 109---------------------; D ~ i ~ ,None------------, --- , --- Spans ; ; ~ ~ ~.~110, lll, 112, 113------; B ;None------------! --- ! --- Spanaway ; ~ ~ • ~ 114*• ' i i i ~ ' ~ ~ Spanaway , i B ~ ~ ~ ,None------------; --- ; --- ~ Nisqually--------------; B ~ ~ ~ ~ ~ ~ ;None------------; --- ; --- i i i i i 115---------------------; C ~ i ~ ;Occasional------;Brief---------; Nov-Apr Sultan ' ~ ' ' ~ ~ ~ i i i 116---------------------; D ~ i ~ i ~ ~ ;Frequent--------;Brief---------; Nov-Jun Tacoma ' ' ' ~ 117, 118, 119-----------; C ;None------------; --- ; --- Teniro ' ~ ' ' ~ i ~ i i i ~ i i ~ 120---------------------' , D ~ ~ ' ' --- ' ,Rare------------, , --- Tisch ; ; ' ' ~ ~ ~ i 121, 122----------------~ B i i i None------------~ --- ; --- Vailton ; , ~ ~ i ~ ~ ~ ~ 123, 1<4----------------; B ~ ~ ~ ;None------------; --- ; --- Wilkeson ' ' ' ~ ~ ~ 125---------------------; C ' ' i i ' ,Rare------------; --- ; --- Xerorthents ' i ' ' ' ~ i i i ~ i ' 126, 127, 128-----------; C i i i i ;None------------; --- ; --- Yelm ' ~ t i ' ~ ~ i i ~ , , i i _ i i i i 1.5-3.0 ;Apparent +1-0 ;Apparent i i i +1-0 ;Apparent i i 1.0-2.0 ;Perched i i 1.0-3.0 ;Apparent i i >6.0 ; --- i >6.0 ; --- i >6.0 ; --- i 2.0-4.0 ;Apparent +1-0 ;Apparent i i >6.0 ; --- i i i 0-1.0 ;Apparent i i i >6.0 , --- >6.0 ; --- i >2.0 ;Apparent i i i 1.5-3.0 ,Apparent i Nov-?Kay Oct-?Kay Oct-?Kay Nov-?Kay Nov-Apr Nov-Apr Nov-Jun Dec-Aor Nov-?Kar Dec-~!ar * See description of the map unit for composition and behavior characteristics of the man .:nit. APPENDIX D Maintenance Schedule SKILLINGS-CONNOLLY, INC, fNllow Glen Phase 111 Subdivision Consulting Engineers Storm Drainage Analysis & Report At7r1~ ~ A = z m ~ lp p~tig o o ~ ~ ~ \ Zp9 9~ ~ ~ A m m m \\ \ lf'CC£ 3 6S,Z5.L5 S ~.• N~ N o n ~ Lp9~p9£ ~33~ -~~~~m ism _ ,y J lA D m O D y ~ ~ ~ m _ ... _ .. y . Z ~ Z n T ~ _ > n ~ m ~., O D A ~ z D ~ Z m= ~oti ~ ~ ~ N Z I II p Z O f .-. D ~ D I ~~ ~ Q j O O ND}:; ~ o A ~na J A A A D I > Z ~ O Z ~ o D o m I oN° c o A A A Z '^ ~ I vJ ~ m N o ~ ~ om ~ ~ m I m / I `~ I x ~ ~--~ --JJO' / I o N -~ _ ~- ~- _--- Tl - ~ _~_ ~_ _~ m ~ I i o I ~•~~• i Z ,` C7i N Cti) I ....~J3i r'.~ / I J`JO JJI ` C7 i i ~ ~' /c I m m i) \ In -~ I x g ° ° ~ ~~;; \ po 08~ po ~ ~r. \ f A r A m ni \ m K ~ :., \ I A ~ z at / r ~..: 332'..._.. ...... _.._._._.._ o c" 4 I~ ~ - ~ ~ ~ 52.77 ~ 52.37 _ ...._ __..._....._ __..._..__..._. - ~ y _ _... z 52 37 _ _ _._.- c7t ~ P I -'--_......_._.._. 52.00 CC' ~ __... _. _. __._._... 52.09 r , _..__. _. _. __. - I,..._......_._ ;.., ................... _.~, 0 335' .. `-' ,~., Q ROBS, I _...._. __--- -- .... 1 ......, _ ~_ .. ~ :t~..~a ...... ~- - - - - - - _..... 3 ~~fPe +O,,O~2 I r _ ~_ ~ ~ 1 0 _ ~ m I _-_Q - ~n l I _ ..,..... -i- ~ A'1 -i- - - - - - - - - - ~~ ay..,. ~ i ~ ._- 52.90 5 . 0 52.00 52 00 33:71'" ~ ~ ++ ~ _ _ ~ _: w o ~ ` SS , ~ i 55 S ~p 5S " 55.65 c`~ o rn m M M -F- R, ~ -~ ?r n 1\ 52y..SS $$ ~ ~ ~ ~ - ~_ M R.ZOT.S w O7 ~ O a _ ; ~p ' :. 4 36.96 f 20 47 • 21 62 ~_ + I ~ ~ ..\27,9 _ _ 4 .. o °~ ~ ~ (D °+ ~ ~ - - -~ ~ ~ ~ ~ ~2 ~ 64.6}' ~ ~, `~ -~ J O A N r m y ~ (-j r ... (n Z ~~ c '; p~ , ~ p I ,• / ~ I 62.ODI 62.00 5889 Kv}Y ~~ ~ $ ~ ~ V ~ ..; - I 48.00 Z Oo ~ I ......... L....... ~> ~, `~~ ~ I N'~ I I ~._ _ G V I, ..~ ~ ~ ~ i ,,.. ~ .... J J9 I .{ I ~ _ W m ~ ~ N II I .~ ,~ m ~ I ~ 5 `~ 44.a2 ,; r ~ I O I ss s` ~ el.lo u>------ O ~ W ,~; I ._ _ _ _. a ~ c~ ~ ~ ( g J q, ~ C: ) ~ ~ ,.... •A , V r W 4r ~ ! i ~ ~ W ~ A Z - ~ I 340' .., l - - , • ~ j ,o - - - Z I I W i D I oo I cD - o _--- -- Z .... ~ - ~......_L.. ..... ... _ ..._. _. ...I~ 50,00 . I ', D 55.00 60.00 57.00 ~.00 ~`~~' ~ rn 62.0 62.00 56 02~ w W .. ~ __ .. ... I I __ .............. __ ___ - ___ W W I ~ _.. ._.. .._...._.__..._._....... ._~ ;, I ~ - N W Ot ° ~ I # ~ I I .._._._. J i ~ ~ ~ ~ to ~ = I 1 ""~ ~ b ~' //rn~'A Y/ V/ _ ~69.I1 W '~' I , .. I ~ ~..... I -1 ~~ \ "'- ~ 19 55 - - 5000 - -Jb~'.. ~ .`., 5v' .. J96 v ~ ~ i T i ~ ~.ycv A . .. .. ..... ....•r~ ~ . , . ....., .. ~2 p ~ I6.3 -4 , ,,,• i ~. O ~ ~~'.. / ~ `G. SS ~ ~ + .. o ,,. `' .> r ~„ L SS SS SS 5 S o rn N '",' -lY - ~ ~ 0 63.60 \~t + ~ ' y ~' ~ + R Ad C S i w 8 % 00 O ~ $ 26.43 50.00 ,b0.00 22.86 ?~ 4 ^ 0 ~--- -- - ~ - - -~ . g VN .... ,; ~~/ \+ I .. ~ 9 ;' ~ti j ,: .... 00 ~l ~ 43U1 `o t0~ '~ 1 W ``~ $ ~ _ _ _-_ - ~ _._.. _._ - __- ~ N 60.00 65.00 53.00 50.00 60.00 7 y ?~ 63.3 - 45.00 .,.,..:..~. ,. .. to .. 00- -0--- --W---Wp--W---xW-•--W--O'W--- -46'14'-W ---W-J70.~--4-'iW .. .-W ~:.W -W- 1L7' . O O - - - _ m , ~ , m o - ~ i--- T- 1- - - - --T - I - _.. - ~ ~ ~ '~....__ ...... _ c5_ SS- - - SS- - -. SS - - - - SS- - - SS- - - cc- ~ ~ _._ ~ - - 04017 WILLOW GLEN PHASE III f ''~. .~, ~. ~ i},, ~ t ~ ,;p a "k t;.. ~"'_~'~ r- ,,,~~ ~v. '. :tg' ~! t~ « err. i'~. acv ~~~...at'~,. ~s-.a.. ,, • '~"~ ~ ~ ~ ' ' `~' `~ ~~ Y ~ / ; ¢ . ~ '~.~. '$ ~~ ~ L y ~ r`M ~~o x,.': ~ ~ . ~ r ~. y~y~~ Lf .. t ! ~ y~ \r. aT ', 1 ~ t ~~ .S ~: y ~ . t .1P~y ~«SY ~ t ~ F ''Pl'y ,,k _( ~ 't'k .. r ~/; ~ 4 -r a'ra ~,`ry. . e A 'r :1~ ~ D isclaimer: Thurston County makes every effort to ensure that this map is a true and ~, a ccurate representation of the work of County govemmen[. However, the County and all ~~ r elated personnel make no warranty, expressed or implied, regarding the accuracy, r, c ompleteness or convenience of any information disclosed on this map. Nor does the County ~ '' ~' a ccept liability for any damage or injury caused by the use of this map. =. T o the fullest extent permissible pursuant to applicable law, Thurston County disclaims all r KV ,~;; ' w arranties, express or implied including, but not limited to, implied warranties of merchant t - `Bot~~`' a bility, data fitness for a particular purpose, and non-infringements of proprietary rights. -; r '+~ U nder no circumstances, including, but not limited to, negligence, shall Thurston County be ~ „ ~.: ~ ~ ~ ' +~ =, ~ ' li able for any direct, indirect, incidental, special or consequential damages that result fmm `,;~ ~" ~- ? , . : ° n -~,t th e use of, or the inability to use, Thurston County materials. l' r Co~toursk 3'° etlands ? ~ "!`hut~ttrrt . ~ 2003 -Thurston Counry GeoData Center rt~,t~.~t:~ ` w -~„~' ' ~ ~ ..:~ ~ ' ~ ~ y"'~~ ' ' ~' ~ Bldg ~4, Rm 205, 921 Lakeridge Dr SW s ~ '~ .. . a s t~-ntcr - ~ '" Olympia, WA9S502-6052 Witlatd'Baitfa~ .. _; ~ , ih;< 1 ~'~ '~, ~ ~, ' rpawFax ;;~ ® T~sT /,~oLE LocATisy/ Willow Glen Phase III Test Holes March 18, 2004 04017 Test Holes No. 1 .~.Y ~ 0' -2' Dark Brown Sandy Loam -'~ ;h 2'-10' Light Brown Gravely Medium Sand _ -~ 6" Roots w^'~' 9.5' Ground Water M ~~i f n ~. .. ~ 1 j"~ -.lT. _ -.7.• _ y . ~~' , . ~' Se • ,} ~ .~ ' P _} ~ ~ ~ ~ ~' w'3. 1° _ :- y:• ~ ~:L t n . t ~~¢~ ~Y~r ~r~ay~y* ~' i~ R4~^^~++ No . 2 0'-2' Dark Brown Sandy Loam 2'-10.5' Light Brown Gravely Medium Sand ~ 6" Roots 10' Ground Water :.,,, r ~= ' ~• ~ ~ . ' , ~~; ~t ~ ,~. .,~'-`~. y,,. ',,.,xa . Willow Glen Phase III Reviewed by Skillings-Connolly, Inc. March 18, 2004 Page I of 3 No. 3 0'-4.6' Dark Brown Gravely Sandy Loam 4.6'-5.6' Light Brown Gravely Medium Sand 6" Roots 4.6' Ground Water ,r } ~~~`~>, ~ ,~: - ~*; ~° '~ No. 4 0'-5' Dark Brown Gravely Sandy Loam 5'-6' Light Brown Gravely Medium Sand 6" Roots 5' Ground Water ~~F. . ~ . ' ' ~~F ¢ ~ ~~ _s:n .r. ,~ +~~. ;^~ Willow Glen Phase III Reviewed by Skillings-Connolly, Inc. March 18, 2004 Page 2 of 3 No. 5 0'-3.5' Dark Brown Silty Loam 3.5'-5' Light Brown Gravely Medium Sand 3.5' Roots 3.5' Ground Water .+r.~ ~~~~ Willow Glen Phase III Reviewed by Skillings-Connolly, Inc. March 18, 2004 Page 3 of 3 APPENDIX D Maintenance Schedule SKILLINGS-CONNOLLY, INC. Willow Glen Phase Ill Subdivision Consulting Engineers Storm Drainage Analysis & Report ATTACHMENT "A" (CONTINUED) Maintenance Checklist for Infiltration Svstems Frequency Drainage System ~ Problem Conditions to Check For Conditions That Should Exist Feature M,S General Trash & debris See Maintenance Checklist for Ponds. See Maintenance Checklist for buildu in and Ponds. M Poisonous See Maintenance Checklist for Ponds. See Maintenance Checklist for ve elation Ponds. M,S Fire hazard or See Maintenance Checklist for Ponds. See Maintenance Checklist for ollution Ponds. M Vegetation not See Maintenance Checklist for Ponds. See Maintenance Checklist for growing or is Ponds. over rown M Rodent holes See Maintenance Checklist for Ponds. See Maintenance Checklist for Ponds. M Insects See Maintenance Checklist for Ponds. See Maintenance Checklist for Ponds. A Storage area Sediment A soil texture test indicates facility is Sediment is removed and/or buildup in not working at its designed capabilities facility is cleaned so that system or was incorrectly designed. infiltration system works according to design. A sediment trapping area is installed to reduce sediment trans ort into infiltration area. A Storage area A soil texture test indicates facility is Additional volume is added drains slowly not working at its designed capabilities through excavation to provide (more than 48 or was incorrectly designed. needed storage. Soil is hours) or aerated and rototilled to overflows improve drainage. Contact the City for information on its requirements regarding excavation. M Sediment Any sediment and debris filling area to Clean out sump to design trapping area 10% of depth from sump bottom to depth. bottom of outlet pipe or obstructing flow into the connector i e. One Time Sediment Storm water enters infiltration area Add a trapping area by trapping area not directly without treatment. constructing a sump for present settling of solids. Segregate settling area from rest of facility. Contact City for uidance. If you are unsure whether a problem exists, please contact the jurisdiction and ask for technical assistance. Comments: A =Annual (March or April preferred) M =Monthly (see schedule) S =After major storm 12 ATTACHMENT "A" (CONTINUED) Maintenance Checklist for Conveyance Systems (Pipes. Ditches, and Swales) Frequenc Drainage Problem Conditions to Check For Conditions That Should Exist y System Feature M,S Open ditches Trash & Dumping of yard wastes such as grass Remove trash and debris. debris clippings and branches into basin. Unsightly accumulation of non-degradable materials such as glass, plastic, metal, foam and coated a er. M Sediment Accumulated sediment that exceeds 20% of Ditch Leaned of all sediment buildup the design depth. and debris so that is matches desi n. M Erosion See Ponds Checklist. See Ponds Checklist. damage to slo es A Rock lining Maintenance person can see native soil Replace rocks to design out of place or beneath the rock lining. standard. missing (if a livable) Varies Catch basins See Catch Basins Checklist. See Catch Basins Checklist. M,S Swales Trash 8 See above for Ditches. See above for Ditches. debris M Sediment See above for Ditches. Vegetation may need to be buildup replanted after cleaning. M Vegetation not Grass cover is sparse and weedy or areas Aerate soils and reseed and growing or are overgrown with woody vegetation. mulch bare areas. Maintain overgrown grass height at a minimum of 6 inches for best storm water treatment. Remove woody growth, recontour, and reseed as necessa M,S Erosion See Ponds Checklist. See Ponds Checklist. damage to slo es M Conversion by Swale has been filled in or blocked by shed, If possible, speak with home-owner woodpile, shrubbery, etc. homeowner and request that to swale area be restored. incompatible Contact City to report use problem if not rectified voluntaril . A Swale does Water stands in swale or flow velocity is very A survey map may be not drain slow. Stagnation occurs. needed to check grades. Grades need to be in 1-5% range if possible. If grade is less than 1%, underdrains ma need to be installed. If you are unsure whether a problem exists, please contact the jurisdiction and ask for technical assistance. Comments: A =Annual (March or April preferred) M =Monthly (see schedule) S =After major storm 14 ATTACHMENT "A" (CONTINUED) Maintenance Checklist for Fencina/Shrubberv Screen/Other Landscaoin Frequent Drainage Problem Conditions to Check For Conditions That Should y System Exist Feature M Unruly Shrubbery is growing out of control or is Shrubbery is trimmed and vegetation infested with weeds. weeded to provide appealing aesthetics. Do not use chemicals to control weeds. If you are unsure whether a problem exists, please contact the jurisdiction and ask for technical assistance. Comments: 13 ATTACHMENT "A" (CONTINUED) Maintenance Checklist for Ponds Frequency Drainage System _ I Problem Conditions to Check For Conditions That Should Exist Feature V M,S General Trash & debris Dumping of yard waste such as grass Remove trash & debris and build-up in pond. clippings and branches into basin, dispose as pre-scribed by City Unsightly accumulation of non- Waste Management Section. degradable materials such as glass, lastic, metal, foam and coated a er. M Poisonous Any poisonous vegetation in which Remove poisonous vegetation. vegetation may constitute a hazard to the public. Do not spray chemicals on Examples of poisonous vegetation vegetation without obtaining include: tansy ragwort, poison oak, guidance from the Cooperative stinging nettles, devils club. Extension Service and approval from the Ci M,S Fire hazard or Presence of chemicals such as natural Find sources of pollution and pollution gas, oil, and gasoline, obnoxious color, eliminate them. Water is free odor, or sludge noted. from noticeable color, odor, or contamination. M Grass not For grassy ponds, grass cover is Grass cutting unnecessary growing or is sparse and weedy or is overgrown. unless dictated by aesthetics. over rown. M Rodent holes Any evidence of rodent holes if facility Rodents destroyed and dam or is acting as a dam or berm, or any berm repaired. Contact the evidence of water piping through dam Thurston County Health or berm via rodent holes. De artment for uidance. M Insects When insects such as wasps and Insects destroyed or re-moved hornets interfere with maintenance from site. Contact Cooperative activities, or when mosquitoes become Extension Service for guidance. a nuisance. A Tree growth Tree growth does not allow Trees do not hinder maintenance access or interferes with maintenance activities. maintenance activity (i.e., slope mowing, silt removal, or equipment movements). If trees are not interfering with access, leave trees alone. M Side slopes of Erosion on Check around inlets and outlets for Find causes or erosion and pond berms or at signs of erosion. Check berms for eliminate them. Then slopes entrancefexit signs of sliding or settling. Action is should be stabilized by using needed where eroded damage over 2 appropriate erosion control inches deep and where there is measure(s): e.g., rock potential for continued erosion. reinforcement, planting of grass, corn action. M Storage area Sediment Accumulated sediment that exceeds Sediment cleaned out to buildup in pond 10% of the designed pond depth. designed pond shape and depth: Buried or partially buried outlet pond re-seeded if necessary to structure probably indicates signifipnt control erosion. - sediment de its. A Emergency Water obstructer Debris block outlet. Remove debris. overflow If you are unsure whether a problem exists, please contact the jurisdiction and ask for technical assistance. Comments: A =Annual (March or April preferred) M =Monthly (see schedule) S =After major storm ATTACHMENT "A" (CONTINUED) Maintenance Checklist for Grounds (Landscaping) Frequen Drainage Problem Conditions to Check For Conditions That Should Exist cy System " Feature M General Weeds Weeds growing in more than 20% of the Weeds present in less than 5% of the (nonpoisono landscaped area (trees and shrubs only). landscaped area. us M Safety Any presence of poison ivy or other No poisonous vegetar;on or insect nests hazard oisonous ve etation or insect nests. resent in landsca ed area. M.S Trash or See Ponds Checklist. See Ponds Checklist. litter M,S Erosion of Noticeable rills are seen in landscaped Causes of erosion are identified and steps ground areas. taken to slow down/spread out the water. surface Eroded areas are filled, contoured, and seeded. A Trees and Damage Limbs or parts of trees or shrubs that are Trim tree/shrubs to restore shape. Replace shrubs split or broken which affect more than trees/shrubs with severe damage. 25% or the total foliage of the tree or shrub. M Trees or shrubs that have been blown Replant tree, inspecting for injury to stem or down or knocked over. roots. Re lace if severe) dama ed. A Trees or shrubs which are not adequately Place stakes and rubber-coated ties around supported or are leaning over, causing young trees/shrubs for support. ex osure of the roots. If you are unsure whether a problem exists, please contact the jurisdiction and ask for technical assistance. Comments: A =Annual (March or April preferred) M =Monthly (see schedule) S =After major storm 15 Willow Glen Phase III Test Holes March 18, 2004 04017 Test Holes R~CE~ V SEp ~~ ? ED ~4¢ 0 ' - 2 ' Dark Brown Sandy Loam ~~~. ~'i'~< ~` " 2' - 6" 10' Light Brown Gravely Medium Sand Roots q ~ ~ ,~ ~~ ~ ~ 1• - '~ ~~;~' - ,._ ~*», _ 9.5 ' Ground Water M» : XA A ~J 4 .:, u a ~ ~ ~ y - +, ,~. ~.,re.-. .i i st" ' A... ~:~ • ~ ~ . - , ~ j,, i' - ` .-~f f . ~ ~ s ' . _ r„y. ! f' No . 2 ~_~ .i ,.> _ 0 ' - 2 ' Dark Brown Sandy Loam '~ ~ ,,'? 2' - 10.5' Light Brown Gravely Medium Sand ;I~i'°` 6" Roots ,~_*~~.~ ~° 10 ' Ground Water ~ :~- _ .'~ ae'Fr~ r _ ,.l ~ ;~ ~ ~~. ~ `~ * + ' ~.t ,' X ~::: "d•- _ ;. ~` - ~` 9 1 Willow Glen Phase [1[ Reviewed by Skillings-Connolly, Inc. March 18, 2004 Page 1 of 3 No . 3 :. . ~r" 0'-4.6' Dark Brown Gravely Sandy Loam _ ~.~ 4.6'-5.6' Light Brown Gravely Medium Sand `^'~"" " :~ -~.: ~ I 6" Roots ~~ ~ 4 . 6' Ground Water to ~~ ~ ~ .: ~ti. ~ : , ~~ ;. .. ~~ ~ ~ . ~ , _ . .; - ,~~ r' _, ~ ;" ~~ # ~` ~ ? • ~~ . ~' d . ..'P. • AA--f~ `~ ' !~- ` ~.~ , ~~ ~~ ~ '~ . f l ~ 1[~J '~ i 3~ . , i }f ~ ~ ~ Y ' }. .,t ~ ;~ 0' -5' Dark Brown Gravely Sandy Loam "~~,_~ ~` 5'-6' Light Brown Gravely Medium Sand ~ '_ o-; . 6" Roots y ~ . ' ~=`~ =~ - 5' Ground Water ,. `'~ ~F~"} ~r ~4 1. , w ~~ ~ ~~ J l: ., ... *: ~ r-- f~ y~_'_ ~ `A ~7: "• '~.. y~,lJy i !~~ ~ f ` rv ~~~ 'lMl._. ~~ ~4 ~ ~~~ Willow Glen Phase III Reviewed by Skillings-Connolly, [nc. March 18, 2004 Page 2 of 3 No. 5 0'-3.5' Dark Brown Silty Loam 3.5'-5' Light Brown Gravely Medium Sand 3.5' Roots 3.5' Ground Water "~ $,, Willow Glen Phase III Reviewed by Skillings-Connolly, Inc. March 18, 2004 Page 3 of 3 ~' .\ . . . .\ .\ .\ ~ ~ ,P . 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