Drainage Report 001Hidden Park
Yelm, WA
Preliminary Drainage Report
October 2007
Prepared by: OLYMPIC ENGINEERING
300 Deschutes Way SW
Suite 315
Tumwater WA 98501
360.705-2474
360.705.2443 fax
Chris@olyeng.com
www.olyeng.com
PRF,I,IMINARY DRAINAGE REPORT
Yelm, Washington
October 2007
Project Information
Project:
Prepared for:
Contact:
Hidden Park
John Lubbesmeyer
John Lubbesmeyer
1151 East 112t^ Street
Tacoma, WA 98445
(253) 537-6370
Reviewing Agency
Jurisdiction:
Project Number:
Project Contact
City of Yelm
Tami Merriman
(360) 958-8496
Project Engineer
Prepared by: Olympic Engineering
300 Deschutes Way SW
Suite 315
Tumwater, WA 98501
(360) 705-2474 FAX (360) 705-2443
Contact: Chris M. Merritt, P.E.
OE Project No.: 0503E
Pile Name: 05032ydr.doc
ahlirys'~ 'ryOrPg~ PROJECT ENGINEERS CERTIFICATION: I hereby certify that this
Cis ~ Z ~ ~ Preliminary Drainage Report for the Hidden ParA Plat iv the City of
} m Yolm, WvshivgWV has been prnpared by me or under my supervision and
4 ~~~~ v, meets the ivtentoRhe WSOOE 19923wrmwater Management Manual,
q O y
~`~A- °Gt6Tef'° G~c ~ unless noted otherwise, and normal standards of engineering practice. I
ES~fOMA4 bN ~ underec nd thatthe jarisdidion does not and will not assomeliabihty for
Ahe sufficiency, auitabdity, or pedormanec of drainage [a lilies designed
`%P'e E6E6 0~ [or this develo t
pmen
Table of Contents
PART I S'PORM DRAINAGE RF,PORT._ .................... _....... _.__.._......... ....1
SF.CTKIN I - PROPOSED PROJECT 11NSCR[PTION._..........._ ........... ....1
SECTION 2 - F%ISTING CONDITIONS ....... _ ......... ....2
SF,CTION 3 - [NF'ILTRATION RATES I SO71.S REPORT ................._.. _._ `L
SECTION 4- R'ELLS ANU SEPTIC SYSTEbIS._ ......................._.__.... ....3
SECTIONS- FUEL TANKS ..... ...... ......... ._.3
SECTION 6- SIJB-BASIN llESCRIPTION ..............................._.....___. ....3
SECTION 7 - ANALYSIS OF 100-YN:AR FLOOD......_.. _....._ ................ ....3
S F.CTION H - AESTHN%CIC CONSIDERATIONS FOR FAC[LITIES_. _... 3
SECTION 0 - DOWNSTRE~VN ANALYSIS ........................................__ .....3
SECTION 10 -COVENANTS, DEDICATIONS, EASEMENTS _______ __.9
SECTION 11 -ARTICLES OF INCORPORATION__._ ........... .... ...._._ .._ 4
PART II EROSION CONTROL REPORT ............................................... .....5
SECTION 1 - CONSTRUCTION SEQUENCE AND PROCEDURE ..... ..... u
SECTION 2- TA4PPING SEDIMENT ..._...... .___ .. _.5
SECTION 3 - PERhIANEN'L EROSION CONTROL .............._.............. ..... G
SECTION 4 - GEOTECIIMCAI. ANALYSIS AND RF.FORT ................ .....0
SECTION 5 - INSPECTION SEQUENCE ....................._.._........... _...... ..... G
SF;CTION 6 - CONTROL ON' POLLUTANTS......._.._............_ ............. ......7
PART III MA[NTENANOE PLAN
SECTION 1 - REQUIRED b7.4INTENANC6 .............................. ................. %
SECTION 2- RESPONSIBLE. ORGANIZ9TION......._. _..._ ..... ............... ltl
SECTION .3- VEGETATION hL4NAGEMENT PLAN ............... ............_. IH
SECTION 4- SOURCE CONTROL__ ..._..._ ..... 1H
:1PPENDICES
Appevdix 1~ PreRmivary Dvainagc
Calwlativvs
APPendix 2- Vicivity Map
Appendix 3 - llveivage Ba»iv Map
Appevdix 4 ~ Soils Report
ii
PART I STORM DRAINAGE REPORT
SECTION 1 -PROPOSED PROJECT DESCRIPTION
Prepared for: John Lubbesmeyer
Contact: John Lubbesmeyer
1151 East ] 12~h Street
Tacoma, WA 98445
(253) 5:57-6370
Parcel Number: 22719`L 10403
Total Site Area: 4.59 Acres
'Coned: K-6
Site Address: 714 Crystal Springs Rd. NW
Yelm, WA 98597
Required Permits: Grading, Utility, Building, etc
Section, Township, Range: Section 19
'township 17 North
Range 2 East, W.M.
Project Overview
The project site is located to the east of Crystal Springs Kd. NW in Yelm. The
applicant proposes to construct a new public roadway through the parcel
connecting to Crystal Springs Rd. NW and Woodland Ct. SE, and to install utility
services to serve 19 single family lots.
The development will he constructed in one phase. Constriction will include
clearing and grading of the site, storm drainage improvements, underground
utilities, and paving. City of Yelm sanitary sewer and water mains will be
extended into the situ to provide services to the residential lots.
Stormwater facilities will be constructed that consist of a proposed wet vault for
storm water treatment along with StormTech chambers for retention and
inSltration of etormwater runoff created by the new development. See
preliminary calculations in Appendix.
Stormwater Treatment:
All Stormwater runoff 6rom the new roadway will be collected in a aeries of catch
basins and conveyed to a wet vault for treatment. The proposed wet vault exceeds
the minimum WSDOE requirements. See Preliminary Drainage Calculations in
Appendix.
stormwater Storage:
llischarge from the wet vault will overflow into StormTech chambers for
stormwater retention and infiltration to groundwater. 'fhe proposed StormTech
chambers exceod the minimum storage requirements per the WSDOE. See
Preliminary Drainage Calculations in Appendix.
Roof Runoff:
RooF runoff from each residential home will be tightliced to individual lot
infiltration drainrock drywells. The drywells shall be sized to accommodate 125 cf
of storage volume per 1,000 sf of roof area.
SECTION 2 -EXISTING CONDITIONS
'l he project site wntxins a single family residence that will remain. All other
structures will be demolished. Site relief is nearly level. The terrain slopes away
to the cast and west from the center of the parcel. Elevations range from a high of
335-feet at the center of the site to a ]ow of 331-feet at the northeast property
corner. Site distinguishing features include a fabric lined fishpond at the southern
end of the site and an existing domestic well at the northern end of the parcel.
Site vegetation consists of cropped field grasses and three fir trees on the northern
half of the site and maintained lawn with landscaping nn the southern half. The
project site is bounded by residential property to the west, undeveloped property
to the north, and developed commercial property to the east and south.
See Section 6 for description of off-site drainage to the property, if any.
The project site is located in xn aquifer sensitive area based on review of Thurston
County Comprehensive Plan Map M-8. This project will comply with the
stormwater treatment requirements of the DOE Manual.
SECTION 3 -INFILTRATION RATES /SOILS REPORT
The Natural Resource Conservation Service (NRCS) soil survey of Thurston
County classifies the on-site soils as Spanaway Gravelly Sandy Loam (Hydrologic
Group A). Soil testing by Parnell Engineering confirmed the Spanaway aeries
classification.
'Three test, pits were excavated by backhoe to a depth of 144" below the existing
grade. One double ring infiltration test was completed in test pit # 2 at 80" below
the existing grade. Test pit soil log data sheets and infiltration Lest results are
2
included in the Appendix of this report.
SECTION 4 -WELLS AND SEPTIC SYSTEMS
No off-site wells were located within 200-feet of this project. An existing on-site
well will be decommissioned prior to final project approval.
A septic system currently servee the existing home. This will be abandoned per
Department of Health standards during development.
Water and sanitary sewer services for the proposed project will be provided by the
City of Yelm.
SECTION 5 -FUEL TANKS
No fuel tanks were located during our site inspection or soils work The latest
"LUST" list (Leaking Underground Storage 'Dank) was reviewed and no listing for
the subject site was found.
SECTION 6 -SUB-BASIN DESCRIPTION
The project site is located within the Yelm Creek Drainage Basin per the Thurston
County Geodata Center. From our site visit there were no signs of existing
drainage swales or channels on the proposed property. There did not appear to be
a significant amount of ofL site mnoff onto the site from adjacent properties.
Hazardous material handling or transportation ie not expected in the area
tributary to the on-site detention facility.
SECTION 7 -ANALYSIS OF 100-YEAR FLOOD
This site does not appear to be located within a Flood plain.
SECTION 8 -AESTHETIC CONSIDERATIONS FOR FACILITIES
All disturbed pervious areas including the storm drainage and open space tract
will he vegetated and landscaped.
SECTION 9 -DOWNSTREAM ANALYSIS
Preliminary calculations for the project stormwater treatment and storage
systems are included in the Appendix of this report.
All stormwater runoff generated by site development will be treated, stared, and
infiltrated on-site. In the event of a failure, storm water will overflow over into
the etorm pipe and catch basin. Adjacent properties should not be affected due to
failure of the proposed stormwater system.
SECTION 10 -COVENANTS, DEDICATIONS, EASEMENTS
On-site drainage facilities will require routine maintenance. A maintenance
agreement will be prepared and finalized prior to final project approval.
SECTION 11 -PROPERTY OWNERS ASSOCIATION ARTICLES OF INCORPORATION
In light of the cesidentia] nature of this project, special covenants covering
landscape, maintenance, signage, stormwater and site maintenance may he put in
place at the time of final platting. The Owner's andlor their representatives will
perform maintenance of these private storm drainage facilities.
PART II EROSION CONTROL REPORT
SECTION 1 -CONSTRUCTION SEQUENCE AND PROCEDURE
Proposed development of the residential property will include site grading and
erosion control measures designed to contain silt and soil within the project
boundaries during construction until permanent erosion control is in place.
Erosion/sedimentation control will be achieved by a combination of
structuraUvegetative cover measures and construction practices tailored to fit the
site.
Beat Construction Management Practices (BMP's) will be employed to properly
clear and grade the site and to schedule construction activities. Before any
construction begins on-site, erosion control facilities shall first be installed. The
planned construction sequence is as follows:
1. Install rock construction entrance. Use 4" to S" diameter spans with 12"
minimum depth.
2. Install filter fabric fencing, where appropriate.
3. Construct temporary sedimentation basins, if neceesary.
4. Clear site (grubbing and rough grading).
5. During November 1 through March 31, all disturbed areas greater than 5,000
sf that are to be left un-worked for more than twelve (12) hours, shall be
stabilized by one of the following: mulch, sodding, or plastic covering.
6. Install underground utilities (cable, telephone, power, etc.).
7. If applicable, provide catch basin protection by installing filter fabric and hay
bales around all inlets to drainage system.
8. After paving is complete, install landscape, sod and/or seed, and mulch all
disturbed areas.
9. Maintain all erosion control facilities until the entire site ie stabilized and silt
runoffceases.
10. Designate an area fox washing of equipment and concrete trucks to control the
runoff and eliminate entry into storm drainage systems.
SECTION 2 -TRAPPING SEDIMENT
A stabilized construction entrance shall be installed at the entrance to the
proposed plat to prevent vehicles from tracking soil away from the disturbed
areas. If sediment is tracked onto public roadways, sediment shall, on a daily
basis, be swept or shoveled from paved surfaces and not washed down into the
roadside storm drainage system.
The contractor shall not be allowed Lo leave disturbed areas greater thin 5,000 sC
that are to be left un-worked for more than twelve (1`L) hours uncovered during the
rainy season from November 1 through March 31. Mulch, sodding or plastic
covering will be used to prevent erosion in these areas.
During construction, the contractor will also be required to install filter fabric
fencing as needed, per the erosion control plan and as directed by the engineer, or
City Inspector
SECTION 3 -PERMANENT EROSION CONTROL & SITE RESTORATION
All disturbed areas will be paved, covered with x building or landscaped with
grase, shrubbery or trees.
SECTION 4 -GEOTECHNICAL ANALYSIS AND REPORT
There are no slopes exceeding 16% on-site, therefore, a geotechnical analyeis was
deemed unnecessary.
SECTION 5 -INSPECTION SEQUENCE
In addition to the normal City inspections, the Project Engineer shall inspect the
facilitiee related to storm water treatment, erosion control, storage and
conveyance during construction. At x minimum, the following items shall be
inspected at the time specified:
1. The erosion control facilities shall be inspected before the start of clearing
and grading to ensure the following structures are in place:
a. Construction Entrance
b. Filter Fabric Fences
L. The conveyance systeme will be inspected after construction of the facility,
but before the project is completed to ensure the following are in working
order:
a. Road Drainage Conveyance System
b. Wet Vault
c. Storm Tech Chambers
3. The permanent Bite restoration measures should be inspected after
landscaping is completed.
A final inspection shall be performed to verify final grades, settings of structures
and all necessary information to complete Engineer's Construction Inspection
Report Form and Residential Agreement to maintain stormwater facilities. These
forms must be completed prior to final public works construction approval.
6
SECTION 6 -CONTROL OF POLLUTANTS OTHER THAN SEDIMENTS
Washout from a concrete truck shall not be dumped into the storm drain, or onto
soil or pavement, which carries stormwater runoff. It can be dumped into a
designated area to be later backBelled or hardened and broken up for disposal into
a dumpster. The Contractor will be required to designate a wash down area for
equipment and concrete trucks.
PART III MAINTENANCE PLAN
SECTION 1 -REQUIRED MAINTENANCE
The following pages contain maintenance needs for most of the components that are
part of your drainage system, as well as for some components that you may not have.
Let us know if there are any components that are missing from these pages. Ignore
the requirements that do not apply to your system. You should plan to complete a
checklist for al] system components on the following schedule:
].Monthly from November through April.
2.Once in late eummer (preferably September).
3.After any major storm (use 1" in 24 hours as a guideline) items marked "S" only.
Using photocopies of these pages, check off the problems you looked for each time you
did an iuspection. Add comments on problems found and actions taken. Keep these
"Checked" sheets in your files, as they will be used to write your annual report (due in
May). Some items do not need to be looked at every time an inspection is done. Use
the suggest fiequency at the left of each item as a guideline for your inspection.
You may call the jurisdiction for technical assistance. Please do not hesitate to call,
especially if you are unsure whether a situation you have discovered may be a
problem.
ATTACHMENT `A'
MAINTENANCE PROGRAM
COVER SHEET
Inspection Yeriod:
Number of Sheets Attached:
Date Inspected:
Inspectors Signature:
A7`TACHMENT "A": MAINTENANCE PROGRAM
Maintenance ChecklSst foe Conveyance Systems (Pipes, llitches and Swales)
Frequency llrainage J 2edd Problem Conditions To Check For Condibons'fhat Should Exist
System Feature
MS_ Pipes J Sediment& Amumulatnd _wdimem that Pipe cleaned of all sedvvent and
debrs ceede 20%of the diameter debris.
of cne vied.
M ~ Vegetation Vegetation [hot rodaces free All vegeLifinv removed so water
nvcmen[o[watnr through flows Reely.
pipes.
A J Domeged Prptedice a~ativg is Pipe xepviredmraplaced_
(rusted, beet dvmvged, rust is rmvsing
cmehed7 re than 6P%deteriorati~n
to any partof pipe.
M J Anv dent that signifiranHy Pipe repaired or reptaced_
impedes Oow (Le, daaeases
thee ecetion arev of pipe
e
by mor
then lp%)_
M Pipe has major cracks or Pipe repaired oaeplvced.
tears allowing groundwater
leakage.
MS Swales Tash& I)umldng nfyard wastes such Retvove trash and debris and
debris ae gase etippings and ~lisposo as prescribed by County
brmches inro Swale. Waste Management Section.
Unsightly accnmulotion of
on-degradable materials
uch as glasx plastic, metal,
foam and coated paper_
M Sediment Aavmulawd sediment that Swale cleaned of all sediment vnd
buildup eeede LO%ol the design debris sotMtit matchcc design.
depth.
M Vegetation Grasv rover is sparse and Aerete rods and reseed and mulch
outgrowing ~eedyorareasare bare arena. Mvintainb ase height
mer~grown vergrown with woody atamivimum of ti"fim hest
cegemtion. stormwater trevtmenL Hamnve
oady growth, remntnur and
wed a nary.
M Conversion Swale has been filled in or If poseibleospeak with homeowner
by homy blocked by shed, wwdpde, and request that Swale area be
mtu shmbbery. etc. reswre3 Contact Comryto
epmpntihle report DroMem i(np[ rectified
volnntarlly.
A Swnle does Water stvvda in ewele or A survey may be needed to check
not drain [low vebcity is very slow. grades Grades need m be in 1
Stagnation occtvs. range if pnssihle_IIgrade is less
than i%, under drains may need
to be ins[alled_
If you ere unsure whether a problem exists, plea_w sumac[ the Jnrisdictiov and ask 6r technical aaistenca
10
ATTACHMENT "A" (CONTLNU);D)
Maintenance Checklist for Catch Basins and Inlets
Frequency Drainage JRegd Problem Conditions To Check Fm Condtinns That Should &xist
System N'eature
M,S General J Trash Trash or deh~ia iv Govtof the No wash or debris located
debris, and retch basin opening is blocking mediately in Gont of retch
sediment capanry Ly more than lU%_ basin opening. Grate is kept
or eo clean and allows water to
bve enter.
M J Sedimevt or debris (iv the No sediment or debris in the
besio)that exmnds V3 the catch basin. Catch basin is
depth Gom the bottom n[basin dog out and clean
m iwert of the loweet pipe into
ovto[the bas n.
M,S J 'trash or debris in my inlet nr Inlet and onGet pipes Gee o[
pine bloJdng mom than 1/3 of trash or debris.
its nelgnc
M J Bupetmal Corner e[Game extende more Frame is even with cmb_
damage to then W4 inch past curb face
frame iota the street (d apPlicahle)_
and/or [op
slab
M J Top elab has holes larger than 2 Top slab is Gee of holes end
eyuare ivchea or erveks wider crocks
than 1/d ivch (intent ie to make
u e all material is mvning
into the basin).
M J Fram not sitting Bush on top Frame is sitting flash on mp
elnb, i.e, eeparetipn n[more slab-
than 3H ivch of the Game firm
thn enp slab
A Cracks in Cracks wider thm tl2 inch and Basin renlamd or mpnircd m
basin longer thm 3 fnzt, any evidence design standards- Contact a
walls) of soil particles ev[ering oateM1 professional engincur for
botwm basin through cracks, or valuation
aintevance parson Judges
that atrnrmm is pnsonnd_
A J Cracks wider thaw ]l2 inch vvd No cracks mom than ll9 ivch
ranger enan l ~t m o,e ioint nr wise at me/oim punlevpntiet
any iNetiouWet pipe or any pipe.
evidenm o[soil particles
entering vetch basin through
acks.
4 J BeWement Basin hassettled more thml Basiv replncedor repaired to
Imisalign- inch or has rotated more than2 design standards. Contacts
ant aches out of aligvmevc professional evgincer 6r
valuation.
11
Frequency Draivage
Svetem Fevmre Jftey'd Problem Cunditio~To Check Por Coaditioas'fhat Shodd Exist
M,S J Fire harard Presevee of chemicals such No color, odor, ur sludge Basin is
rather natural gay oil, and Jug out and elem.
polloM1iau gasoline Obnoxious mlur.
odor, or sludge noted.
M,5 J Oodet pipe is Vegetation or roots gn~wiug No vegehatiovnaoot growth
dogged with nideUouWet pipe joints preeenG
vegeGtioa that is more than a& inches
wu and free mans:. iernea
avert.
If yov are insure whether a vroblem exists, please wnmct We Jnri=dietion end ask fir technical neeistance-
Comments
l~ A=Annual (Marchm Aprd Dm&acd)
M =Monthly (see schedule)
5 = Mcr major storms
12
ATTACHMENT "A" (CONTINUED)
Maiuteuance Checklist for Grounds (Landscaping)
Fregnen~y Drainage J Problem Conditionsm Chec4 Par Gonditiove That Should Exist
S1stem
Feature
M General Weeds Weeds gmwivg in more M1hap Weeds pmsent in less then 6Y of
(nonpoisonous) 20%of the lvndsreped urea the lmrdwnped area~
(trees and shrubs only).
M J 63foty havrd Any presence of poiwn ivy nr No poisonous vegetation or
other poisonous vegelntim o[ asset nests p2sent in
sect nears landscaped area.
M,S J Trash or litter Sce Prods Checklist. Sec Pods Checklisk
M,S J Erosion oP Noticeahle ells are seen in Causes ofemsmn are identified
Ground Surface landscaped areas avd steps taken b slow
dow Nspreadnut the water~
Eroded are:cs are filled,
wntoured avd seeded.
A Trees and J Damage Limbs or parts of trues or Tnm[xees/shmbsmrestore
shmbs shmbs that axe split or shape Replace heeNshmba
brolen which affect more with severe damagn_
than 2b% of thn total (ofiage
of the tree nr shrob_
M J Trees or shrubs that havo Replvnt tree, inspecting lur
bmn blown down o. knocked injury w stem or roots. Replan
.er. it severely damaged-
A J Trecn or ehrubswhitlr aro Plamstakes and robhercoavA
not adegmtely.ruppnrted nr fiusaroand young trees/shmba
m leaning oveq causing lnr enppart_
exposure oPthe roots
If yon are unsure whether a problem exists, please contact the And diction and ask for teehvieal assistance.
Comment
Kev
A= Annoal (binrch or April pm@rrcd)
M =Monthly (see echedole)
5 = AR.er major storms
~.~
ATTACHMENT"'A" (CONTINUL~ ll)
Maintenance Checklist for Infiltration Systems
Frequency nraimge Jnujd Yrnhlem Conditions to Check Por Cooditrnvs That Should F.xist
System
Feature
M,B Genervl J Tmsh& See Mvintnnance Checklist 6r See Maintenance Checklist for
debris Ponds- Poods-
buildup in
pens
M J Poisonous See Muinnnmmw Checklist for See Maintenmce Checklist fur
vege[etlon Ponds Ponds
M,S J Fire See Mvintenance Checklist 6r See Maintenance Checklist for
havsrd or PondA Pmde.
pollution
M J Vegetation See Maintenanw Checklist 6r See Maiotevance Checklist 6r
nut rnnaa. Ponce
gm ing o[
ergs a
M J 2odent See Mvintenanw Checklist for See Maintenance Checklist for
holes Ponds. Ponds
M J Insects Ses Maintevnnm Checklist for See Maintenance Checklist 6r
Pnnds_ Fonda.
A Storage J Sediment Asoii texture test indicates Sediment is removed and/or
rsa buildup in fariBty is not working at its futility is cleaned so that
system designed capabilitres or was i~laefion syswm works
correctly desgned_ cording to design. A
sediment trapPrn6 area is
instaIled to reduce sediment
transport into infiltration area
q J Btprvge A soil texture test indicatee Additional volume is added
futility is nut working at its through excavation mprovide
drains designed capabilities or was eeded storage. Soil is aerated
elowly cnrrecGy designed. and mtnWled to improve
(more than drainage- Contnot the Oiry fur
ax nonre) in[ormntlon on its renniremema
regvrding excavatra2
vmno..~
M J Sediment Any s diment and debris filling Clean out sump W design
happiog en m 10% of depth Gom sump depth
rsa bottom to bottom of outlet pips
r nhctrncting slow into t}~e
ennecu,r vipe_
Ooe Time J SWiment Stormwvter enters infiltration Addatmpping area by
trapping roe directly without onstructinga sump 6r settling
vat treatment of muds Begregatc settling
present ee from rest of GcWty.
Contact City for guidance.
M Nock filters J Sediment By visual inepectlon little or no Replace gravel in rock filter.
and debris water flows through filter
dining heavy rain storms
S Infiltration J Infiltration Standing Water in Inspection Exrzvate bottom o[treoch as
Trenches Failure Weil After a8 home after ssvey but atleast 3feee
storm or OveAOw darin Re Ime with crashed mek.
14
Storms CM1eck prelrevtmeot systems
[or effectiveness. Oheck
tribvtvey area !or sediment
If you vre unsure whether a problem exists, please cvvuct the Jnrisdietion and ask 6m tedwral assistanrr-
Cummnvts_
XeY A=Novel (March or Aprd pro&rred)
M =Monthly (see schedule)
5 = 4f[er major storms
15
ATTACHMENT "A" (CONTINUED)
Maintenance Checklist £or Closed Detention Systems (Tanks/Vaults)
~J~ereq. DrainaKC JRega Preldnm copaadapa In Cnaek Por cona;Hona Tnat sbonla Dx;ac
s~atem
Pcawm
M Storage Area J Flogged Air Onc-ha1Po[the cross eec[ion ofa Vevte open mdfvvefioning_
Vents ant is blocked at any point or
she xent ie aamaKea_
M Storage Area J Uebds and Accumnlvted sediment depth All sediment end debris
Sediment mess t0%oP the diemetu of rowed 6om etornge urea.
the storage area For X length of
shmalP- vavR or any point aepth
coeds ]6%o[diamemr.
(lu`xamplc 92~inch storvge tank
vu1J inquire cleaning wnen
ediment reaches depth of 7
indms 6r more then ]IZ length
of tmdJ
A Storage Area J Joiv[e Any npemnKS Or voids allowing All joint between taddpipe
Between materiel to be transported into eectims ere se~led~
Tavk/Pipe feribty-(Will rnquim
Section engine rinF analrais [o
deteonme stmcmral emb~ty).
A Storage Area J Tmrk Pipe Any part o[tenWpipe le beet oat Tenk/pipe repaired or mplaced
Bent Out of of shape mom than Lo°h of its m desg¢
Shope desiKn shape (Review required
ny ens Weer m dntermme
atmchiral stability}
A Sorage Area ~ Vault Cracks wider than V2-inch and Vault mplared or repaired to
Strmmm env evidence ofsoil vartides design speoibcatiovs and is
Includes entering the strveenre mronKh atrvemrelly eound-
oracksin the crocks, or
Waq aivtewnrernspewnn
Rotmm, pmsonnal aemrmmea mac me
Dnmvgc m cult is not stmctmally spuvd.
Pra
andlor'PoP
scan
A S[omge Ame J Crocks wider than l/2-inch at No creeks more tnav l/4-inch
the joint o[any inlcUwllet pipe wide at the join[o[the
any evidence o(_snil particles inlctlonHet pipe.
enredns ma narat mroegn me
walla
A Manhole oover Not Cover cing or only
~ Mannolo 5s closed-
in Plvice pertlelly n
plats- Any open
aMolo regoircs mnin[enance.
A Manhole J Locking Mechanism rnmot be opened by Mechanism opaos with prover
Mechanism a ainWnance person with cools.
Not proper tools- Rolls inm Gamn
Working bave. less than t/2 inch of mread
(mvY not apply to selGlockinK
uaal.
n Mavholc J Gwer one mainenance Person cevnot Cover can ne removed and
Difficult to ve lld after vpplrmg installed by one maintenance
Itemm~e coal lifting pressure. Intent
o perrnm
i_a
m keep coven Gom sevling afi
ccess to maintenance.
15
4 req. Dralnvge JReq'd Problem Conditions [o Check Fur Cooditims Thnt Should ExfeL
Syetem
Peamm
A Manhole ladder Ladder is uvsnfe duemmfseivg imdder meets design standards.
Nungs ungx, mivaligvmev4 not Allows maintenance perwn sale
Unssfe urely auacheJ astruewm ceess-
well, mst, or Grads.
I[ynu am unsum whether v problem exist, vlease oovmet the Jurisdiefion and ask far techvfcal sss~stnnee.
Comments:
Key A=Avnuai (March or April prekrredl
M =Monthly (see z,:hedoie)
S =After major storms
17
SECTION 2 -RESPONSIBLE ORGANIZATION
The Homeowners Association shall be responsible for the operation and
maintenance of all on-site drainage facilities.
SECTION3-VEGETATION MANAGEMENT PLAN
All disturbed pervious areas within the site will be landscaped to provide an
aesthetically pleasing environment.
SECTION 4 -SOURCE CONTROL
Warning signs (e.g., "Dump No Waste - llrains bo Groundwater') will be embossed
or painted on or adjacent to all storm drain inlets and will be repainted
periodically as necessary.
1R
Appendix I
Preliminary Drainage Calculations
PRELIMINARY DRAINAGE CALCULATIONS
'Che following calculations were based on the requirements contained in the WSUOE
Stormwater Management Manual, 1992 edition.
DESIGN AND BASIN INFORMATION SUMMARY:
~ip< , ,i P„o5k D ~vel'oprrient Ba sin Area Summary (Acre"s~ , ` ° ~:.`-
Sub-Basin A Total
Impervious Roadway 0.87 0.87
Concrete Sidewalk 0.14 0.14
Impervious Driveway 0.26 0.28
Impervious Roof Area 0.87 0.87
Disturbed Pervious 2.75 2.76
Total 4.89 4.89
Roof Area: 2,000 sfllot
Driveway Area: 600 sf/lot
Soil Classification:
SCS Soil Classification: Spanaway Gravelly Sandy Loam
Hydrologic Group: A
Design Infiltration Kate: 2d'/hr
SUB-BASIN `A' WATER QUALITY CALCULATIONS
Minimum Stormwater Treatment Area Required:
StormShed software was used to model the runoff from the on-site roadway,
sidewalks, and driveway areas- The 6-month storm event resulted in a peak
volume of 4,868 cf:
'Phe DOE manual requires that "the permanent pool volume equals the runoff
volume from the 6-month, 24-hour design storm.
Stormwater Treatment Area Provided:
The DOE manual, Section III-4.3.2, requires that "the permanent pool volume
equals the runoff volume from the 6-month, 24-hour design storm. Using 4 - 125
LF of 4-foot diameter pipe as a wet vault, with across-sectional area of 10 of at a
3-foot depth, results in an available pool volume of 5,000 ef, which exceeds the
required volume of 4,868 cf.
See the following SWrmShed modeling output.
SUB-BASIN `A' WATER QUANTITY CALCULATIONS
*See attached StormShed software output
Stormwater Storage Volume Provided:
36 StormTech Chambers: (36)(45.9 cf/chamber) = 1,652 cf
Stone Volume w/ 6' Stone Base
and 12" Perimeter (30% void ratio): =963 cf
Wet Vxult Live Storage Volume: =1,230 of
Tot¢l Storage Volume Provided =7,652 of +963 of+7,230 cf
= 3,845 cj> 2,673 ej .: OK
Active Volume = 2,613 cf (see attached StormShed software output)
24-Hour Drawdown
(46' x 30(20"/hr)(1"/12(24 hr) = 55,200 cj> 2,613 cf .: OK
ROOF RUNOFF
Roof runoff from each residential home will be tightlined to individual lot
infiltration drainrock drywells. The drywells shall be sized to accommodate 125 of
of storage volume per 1,000 sf of roof area.
Olympic Engineering
Water Quality - 6-Month
Basin A - 6mo Event Summary
BasinlD Peak Q Peak T
Event
----- (cfs) (hrs)
Basin A-6mo 0.34 8.00
Drainage Area: Basin A - 6mo
Hyd Method: SCS Unit Hyd
Peak Factor: 484.00
Storm Dur 24.00 hrs
Area CN
Pervious 0.0000 ac 78.00
Impervious 1.2700 ac 98.00
Tolal 1.2700 ac
Supporting Data:
Impervious CN Data:
Roadway 98.00
Sidewalks 98.00
Driveways 98.00
Pervious T C Data:
Flow type: Description:
Fixed None Entered
Impervious TC Data:
Flow type: Description:
Shallow Roadway
Channel Slorm Pipe
Water Quality- 100-Year
Hidden Park SfonnS~etl
#05032 10131/200]
Peak Vol Area Method Raintype
(ac-ft) ac /Loss
0.1117 19 SCS/SCS TVPEIA 6mo
.. 4,a,s ~f
Loss Method: SCS CN Number
SCS Abs: 0.20
TC
0.00 hrs
0.18 hrs
0.8700 ac
0.1400 ac
0.2600 ac
Lengfh: Slope: Coeff: Travel Time
0.00 ft 0.00 % 0.0100 0.00 min
Lenglh: Slope: Coeff: Travel Time
370.00 ft 0.50 % 27.0000 4.29 min
575.00 ft 0.50 % 21.0000 6.45 min
RLPCOMPUTE [Pond Level Pool] SUMMARY
100 yr MatchO=PeakO= 1.4870 ds Peak Ou[ O: 0.8857 cfs -Peak Stg: 326.01 ft -
Active VoI: 2613.63 cf
Summary Report of all RLPooI Data
Project Precips
[2 yr] 2.00 in
[5 yr] 2.50 in
[10 yrj 3.00 in
[25 yrj 3.00 in
[100 yr] 4.00 in
[6 mo] 1.28 in
BASLIST2
[Basin A] Using [TYPEIA] As [100 yr]
LSTEND
1 of3
Olympic Engineering Hitltlen Park S[oimShetl
#05032 10I31I200]
BasinlD Peak Q Peak T Peak Vol Area Method
Event
---- (cfs) (hrs) (ac-ft) ac /Loss
BasinA 1.48]0 800 0.8241 4.02 SCSISCS
BASLIST [rYPE1A] AS [100 yr] DETAILED
[Basin A]
LSTEND
Drainage Area: Basin A
Hyd Method: SCS Unit Hyd
Peak Factor: 484.00
Storm Dur 24.00 hrs
Area
Pervious 2.7500 ac
Impervious 1.2700 ac
Total 4.0200 ac
Supporting Data:
Pervious CN Data:
Landscaping
Impervious CN Data:
Roadway
Sidewalks
Driveways
Pervious TC Data:
Flow type: Description:
Sheet Landscaping
Impervious TC Data:
Flow type: Description:
Shallow Roadway
Channel Storm Pipe
Raintype
TYPEIA 100 yr
Loss Method: SCS CN Number
SCS Abs: 0.20
CN TC
78.00 0.97 hrs
98.00 0.18 hrs
78. 00 2.7500 ac
98 .00 0.8700 ac
98 .00 0.1400 ac
98 .00 0.2600 ac
Length: Slope:
488.00 ft 1.00
Length: Slope:
370.00 ft 0.50
575.00 ft 0.50
HYDLIST SUMMARY
[Basin A 100-yr out]
LSTEND
HytlID PeakO PeakT
------- (cfs) (hrs)
Basin A 100-yr out 0.89 9.50
STORLIST
[StormTech Chambers]
LSTEND
Node ID: StormTech Chambers
Coeff: Travel Time
0.1500 58.12 min
Coeff: Travel Time
27.0000 4.29 min
21.0000 6.45 min
Peak Vol Cont Area
(ac-ft) (ac)
0.8254 4.0200
Desc: StormTech Chambers
Start EI: 322.5000 ft Max EI: 326.0000 ft
Contrib Basin: Contrib Hyd:
Length Width Void Ratio
46.0000 ff 30.0000 ft 54.00
DISCHLIST
[Infiltration]
LSTEND
2of3
Olympic Engineering Hidden Park StormShed
itOW32 10/31/200]
Control Structure ID: Infiltration -Infiltration control structure
Descrip: StormTech Chambers
Start EI Max EI Increment
322.5000 H 349.0000 K 0.10
InFil: 20.00 inlhr Multiplier: 1.00
3 of3
Appendix II
Vicinity Map
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W Z
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an 3
a
non 3
'^ '^ .n `v
°n°n 0~3
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Appendix III
Drainage Basin Map
a
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to
z
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v o~F
{:
~)
w
Appendix IV
Soils Report
Crystal Springs Plat
Soils Report For Drainage Purposes
Site Address: 714 Crystal Springs Road Yelm, WA 98597
Tax Parcel Number: 22719210403
Prepared For: Landshapes Northwest Lnc.
1151 East 112' Street
Tacoma, WA 98445
(253)537-6370
Contact: John Lubbesmeyer
Prepared By: Parnell Engineering
10623 Hunters Lane S.E.
Olympia, WA 985]3
(360) 491-3243
Contact: William Parnell, P_E.
PE
PARNELL ENGINEERING
SOIL EVALUATION REPORT
FORM 1: GENERAL SITE INFORMATION
PROJECT TITLE: Lubhesmeyer-Crystal Springs Plat SHEET: t OF 1
PROJECT NO. :05152 DATE: 12/19/05
PREPARED BY :William Parnell, P.E.
1. SITE ADDRESS: 714 Crystal Springs Road Yelm, Wa. 99597
TAX PARCEL NUMBER: 22719210403
2. PROJECT DESCRIPTION: Create a 25101 residential subdivision.
3. SITE DESCRIPTION: The 4.99 acre project site is currently occupied by a single residential tlwelling and
several outbuildings. Site relief is nearly level. The terrain slopes away to the east and west from the center
of the parcel Elevations range from a high of 335 k. at the center of the site to a low of 331 ft. at the
northeast property corner. Site distinguishing features include a fabric lined fishpond at the southern end of
the site and an existing domestic well at the northern end of the parcel. Site vegetation consists of cropped
field grasses and three fr trees on the northern half of the site and maintained lawn with landscaping on the
southern half. The project site is bounded by fully developed residential property to the west, undeveloped
property to the north and developed commercial property to the east and south. Access is off Crystal Springs
Road SE byway of a 40 R. strip of property. On-site soils are swell-drained Spanaway series formed in
glacial oulwash.
4. SUMMARY OF SOUS WORK PERFORMED: Three test pits were excavated by backhoe to a depth of
144" below the existing grade. Soils were inspected by entering and visually logging each test pit to a depth
of four feet. Soils beyond four feet were inspected by examining backhoe tailings. One double ring infltration
test was completetl in test pit #2 at 80" below the existing gratle. Test pR soil log tlata sheets and a double
ring infltration test result are included in this report.
5. ADDITIONAL SOILS WORK RECOMMENDED: Additional soils work should not be necessary unless
drainage infiltration facilities are located outside the general area encompassed by the soil test pits.
6. FINDINGS: The Natural Resource Conservation Service soil survey For Thurston County mapped the on-
site soils as a Spanaway Gravelly Sandy Loam (110). The three test pits confirmetl the Spanaway
designation generally profiling a gravelly fine sandy loam surtace soil overlying an extremely gravelly &
cobbley coarse sand substratum. The substratum gravels and sands were slightly to moderately loose.
Winter water table was not present and indicators were not visible. A double ring infiltration test completed at
BO" below the existing grade in test pit #2 yielded an infltration rate of 432 in/hr.
7. RECOMMENDATIONS: The Spanaway soil series is a somewhat excessively drained soil that formed in
gravelly glacial outwash. Infiltration rates ate generally rapid in the substratum soils. The specified
substratum C-horizon soils should be targeted for all drainage infiltration facilities as noted in the attached
soil log data sheets. A design infiltration rate of 20 in/hr or less woultl be appropriate for these targeted soils.
During construction, care must betaken to prevent the erasion of exposed soils. Drainage facility infiltration
surtaces must be properly protectetl from contamination by the fine-grainetl upper horizon soils and from
compaction by construction site activities. Soils not properly protectetl will cause drainage infltration facilities
to prematurely fail.
I hereby certify that I prepared this report, and conducted or supervised the pertormance of related work. I
certiy that I am qualified to do this work. I represent my work to be complete an accurate within the bounds
of uncertainty inherent to the ractic o its science, and to be suitable for its intended use.
SIGNED: Rir ~'"~
DATE: IZII~fOc ` / ~.~
SOIL EVALUATION REPORT
FORM 2: SOIL LOG INFORMATION
PROJECT TITLE: Lubbesmeyer -Crystal Springs Plat SHEET: 1 OF 3
PROJECT NO. :05152 DATE: 12/8/05
PREPARED BY :William Parnell, P.E.
SOIL LOG: #1
LOCATION: 270 ft. west and 60 ft. south of the northwest property corner.
1. TYPES OF TEST DONE: 2. SCS SOILS SERIES: 3. LAND FORM:
None Spanaway (110) Terrace
4. DEPOSITION HISTORY: 5. HYDROLOGIC SOIL 6. DEPTH OF SEASONAL HW:
GROUP:
Glacial Oulwash A/B Unknown
7. CURRENT WATER 8. DEPTH TO IMPERVIOUS 9. MISCELLANEOUS:
DEPTH: LAYER:
Greater than bottom of hole Greater than bottom of hole Nearly Level
10. POTENTIAL FOR: EROSION RUNOFF PONDING
Minimal Slow Minimal
11. SOIL STRATA DESCRIPTION: See Following chart
12. SITE PERCOLATION RATE: See FSP
13. FINDINGS & RECOMMENDATIONS: Use a design infiltration rate of 20 in/hr or less for drainage
infiltration facilities located in Me C7, C2, C3 and C4 horizon soils.
Soils Strata Description
Soil Log #1
Horz Deoth Color TexNre
A 0"- 15" t0YRZ1 VGrBSiSaLm
Bw 15"- 18" fOVR3/6 ExGrSaLm
C1 18"- 2]" 10VR5/6 ExGrCSa
some stones
C2 2]'- 60' tOVRS/6 EvGrBCOb
CSa
C3 60"-105" 10YRSI6 ExGrCSa
C4 105'-144' 2.5V4/1 E%GfD$a
%CL %ORG CF STR MOT IND GEM ROO <X> FSP
<20 b c40 15BK - - - f1 2E 1
c15 - <]5 SG - - - R 2-6 4
c3 - c85 SG - - - - >20 >40
c1 - <g0 SG - - - - >20 >40
<t - c95 SG - - - - >20 >40
<i - c96 SG - - - - >20 >40
SOIL EVALUATION REPORT
FORM 2: SOIL LOG INFORMATION
PROJECT TITLE: Lubbesmeyer -Crystal Springs Plat SHEET: 2 OF 3
PROJECT NO. :05152 DATE: 12/8/05
PREPARED BY :William Parnell, P.E.
SOIL LOG: #2
LOCATION: 300 k. south and 45 k. east of the northwest property corner.
1. TYPES OF TEST DONE: 2. SCS SOILS SERIES: 3. LAND FORM:
Double Ring Infiltration Spanaway (110) Tenace
4. DEPOSITION HISTORY: 5. HYDROLOGIC SOIL 6. DEPTH OF SEASONAL HW:
GROUP:
Glacial Outwash A/B Unknown
7. CURRENT WATER 8. DEPTH TO IMPERVIOUS 9. MISCELLANEOUS:
DEPTH: LAYER:
Greater than bottom of hole Greater than bottom o(hole Neary Level
10. POTENTIAL FOR: EROSION RUNOFF PONDING
Minimal Slow Minimal
11. SOIL STRATA DESCRIPTION: See Following chart
12. SITE PERCOLATION RATE: See FSP
13. FINDINGS 8 RECOMMENDATIONS: A double ring infiltragon test completed at 60" below the
existing grade yielded an infiltration rate of 432 iNhr. Use a design infiltration rate of 20 in/hr or less for
drainage infiltration facilities located in the Ct, C2 and C3 horizon soils.
Soils Sttata Description
Soil Log #2
Horz De ~ Color TexNre °bCL %ORG CF STR MOT IND CEM ROO <X> FSP
A 0'- 2(Y' 10VRZIt VGr6aLm <20 <5 <45 15BK - - - ff 26 1
ewi 20'- 28" 10VR3Y3 VGrSaLm <15 - <50 SG - - - H 2-6 2
eve 28"- 32' 10YRM6 ExGrSaLm <10 - BS SG - - - H 2-6 4
C1 32'- 49" tOVR516 ErGr8COb5a <3 - <86 SG - - - - >20 >40
G2 49'-68" 10VR6/6 Gravel wdb <1 - <96 SG - - - - >20 >40
Santl bintler
C3 fi8"-122° tOVRM4 ExGrCSa <t - <g8 SG - - - - >20 >40
SOIL EVALUATION REPORT
FORM 2: SOIL LOG INFORMATION
PROJECT TITLE: Lubbesmeyer -Crystal Springs Plat SHEET: 3 OF 3
PROJECT NO. :05152 DATE: 12/8/05
PREPARED BY: William Parnell, P.E.
SOIL LOG: #3
LOCATION: 610 tt. south and 20 tt. east of Ne northwest property comer.
1. TYPES OF TEST DONE: 2. SCS SOILS SERIES: 3. LAND FORM:
None Spanaway (110) Terrace
4. DEPOSITION HISTORY: 5. HYDROLOGIC SOIL 6. DEPTH OF SEASONAL HW:
GROUP:
Glacial Outwash A/B Unknown
7. CURRENT WATER 8. DEPTH TO IMPERVIOUS 9. MISCELLANEOUS:
DEPTH: LAYER:
Greater than bottom o(hale Greater than bottom o(hole Nearly Level
10. POTENTIAL FOR: EROSION RUNOFF PONDING
Minimal Slow Minimal
1 i, SOIL STRATA DESCRIPTION: See Following chart
12. SITE PERCOLATION RATE: See FSP
13. FINDINGS 8 RECOMMENDATIONS: Use a design infiltration rate of 20 iNhr or less for drainage
infiltration facilifies located in the C1, C2, C3 and C4 horizon soils.
Soils Strata Description
Soil Log #3
Horz Depih Color Texwre °hCL %ORG GF STR MOT IND CEM ROO <X> FSP
A 0'- 17" t0VR211 VGrSaLm c20 <6 <20 iSBK - - - H 2-6 1
Bw1 17"- 20" 10VR813 VCOb86t <15 - <66 SG - - - R 2-6 2
saLm
Bv2 20"- 24° 10VR3I6 ExGrsaLm '10 - <65 SG - - - ff 28 4
C1 24"- 69" 10VR6/6 EzGrCSa c3 - <g8 SG - - - - >20 >40
C2 69"-78" t0VR616 Gavel wRh q - c99 SG - - - - #0 >40
C6a bintler
C3 78'- 96" 10YRSI6 ExGrCSa <7 - <96 SG - - - - >20 >40
C4 98°-144' 2.6Y411 ExGrBCOb <i - <98 SG - - - - >20 >40
Csa
Abbreviations
Textural Class
(Texture) Structure
(STR) Grades of Structure
Cobble -Cob Granular - Gr Stron - 3
Stone - St Blocky - Blky Moderate - 2
Gravelly - Gr Plat - PI Weak - 1
Sand - Sa Massive - Mas
Loamy - Lm Sin le Grained - SG
Silt - Si Sub-An ular Block - SBK
Cla e -CI
Coarse - C
Ve -V
Extremely - Ex
Fine - F
Medium - M
Induration & Cementation
(IND) (CEM)
Weak - Wk
Moderate -Mod
Strong - Str
Mottles (MOT)
1 Letter Abundance 1st Number Size 2nd Letter Contrast
Few - F Fine - 1 Faint - F
Common - C Medium - 2 Distinct - D
Many - M Coarse - 3 Prominent - P
Roots (ROO)
1st Letter Abundance 2nd Letter Size
Few -f Fine -f
Common - c Medium - m
Many - m Coarse - c
<X> -Generalized range of infiltration rates from SCS soil survey (<X>)
FSP -Estimated Field Saturated Percolation rate based on horizon specific
factors.
DOUBLE RING INFILTRATION TEST
Crystal Springs Plat
Test Date 12/6/2005
Completed By : William Parnell, P.E.
PE Job : #05152
DOUBLE RING INFILTRATION TEST
Test Hole # 2 (test run @ 80" below existing ground surface )
Start Sto Ela sed Time Total Dro Infiltration Rate
( Min) (Min) (Min) (Inches) (In/Hr )
0 25" 25" 6
25" 50" 25" 6
50" 1' 20" 30" 6
1' 20" 1' S0" 30" 6
Soaking Period
10' 00" 10' 40" 40" 6
10' 40" 11' 20" 40" 6
11' 20" 12' 00" 40" 6
12' 00" 12' 40" 40" 6
12' 40" 13' 25" 45" 6
13' 25" 14' 05" 40" 6
14' 05" 14' S0" 45" 6
14' 50" 15' 30" 45" 6
15' 30" 16' 15" 45" 6
16' 15" 17' O5" 50" 6
1T OS" 1T 55" 50" 6
1T 55" 18' 45" 50" 6
18' 45" 19' 35" 50" 6 432