HomeMy WebLinkAbout990600152 Drainage Report
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NT' ,,'
NTIENGINEERING &S,tJRVEYING
}'17 SOlJTHPEABODVS~EET, PORT ANGELES;WA 98362/'
.,Engirieers.LandSufveyors.Geologisis' !'
Cpnstruction Inspection . MaterialsT~sting ,
Prepared by
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Kate Waddell, P.E.
NTIEngineering & LandS'urveying .'
.717 South Peabody
, Port Ang.eles,WA9836Z
360..452..8491
www.nti4u.com
RECEK~lE1D
Dell 02BUB
. July 11, 2008
APPROVED
STORMW ATER PLAN
JEfFERSON LHuNrYDCn
NOV 2 12008
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NTIEngineering and Land Surveying was hired by 'Gary Hackney tbdevefopadrain;:;tge '
and erosion controtplanfor hi~ proposed residential hpme site on Lot 54 off'
Montgomery Lane, Port LudIOW"JeffersonCountyin Section 9, ,r ownship' 28 North, ,
Range 1 East: , As part of this anaJysi~, a stormwater coUe,ctionandconyeyanc,e,system' ,
hasbeendesignedand a temporarya~dper:manenterQsion' and sediment control plan
ha, ,sbeehprepared for "the'constl'uctlonOfa, privatesingie4amily reside,nceand'
driveway. ' , ' '
ILDESCRIPTioNOFSITEl,'
'The, home site is roughly a .7&-foorQy170-footlotWith a qO-fOdfhighmaril'leb1uff tathe
,east. 'Th~'lotis bordered 011 thenorthandsou'thbydeveloped single,farT!ily residential,,"
, fots., The site 'is:accessed.via Montgomery, Lan,~frornthewest. The ',lot. is,uodevelCJped. '
" a,ndheavilYQoyeredwithnative'vegetation. , '
Jeff~r$,on "C09nty ,requires"the."use',Of,'the" Depa~ment iOf'"EcologY:(O'OE}'February,,2ooq', "
Sto~rnwater ;M~nagernentManual forWesterqVVashington. Based :onthe manual,new, '
developmen~ with a 'propoS~djrnperv,iovsareagreaterthan2,'OpO'squarefeet:but'les~ "
than 5,000; squarefeefand'acOnversior:lofhativeVegetafiontolawnoflessthan%of
an acr~ determines", minimum' requirements ,1 throUgh 5snallbe,'appTied tot~iS' proRet}Y.
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Thes~rnlhimurnreq~irelT1entsare and wiUhemeti::isfoflows:
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Minirnl..lmRequirement#1Pre'paration of StormwaterSite,Pla'n
., Acompletesite'plarihas been,included!n the appendix Qfthisreport.
Minimum, Requiren1ent#2,' GonstructionStonnwater Pollution Prevention (SVVPP)
· The SWPPincludestwelveele,r;nents; Eacl1element will be addressed
separately as follows:
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. , ',Elernent#1 MarkClearingLimits ',' ,
o Que to fhesizeofthe lotandthe extentoftheresidentialdevelopment the
construction fe,ncingshaH be placed along the north, south, and west
propertylines.and along the bluff buffer line.. " '
o The native topsoil layer shall. be stripped within the house and driveway
. footprint. and stockpiled on site. Thetopsoil shall be re-spreadafter
,development. While stockpiled topsoil sha~1I be coVered to prevent
erosion.
RECEI\(~~nt #2 Establish Gonstruction Access ' .
,,' , ',',' 'o/lt!tdL)1The construction access to the sitewiH b.e the same asthe final driveway
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access.
OCT 10 2008 0 The driveway shall be stabilized withe pad of crushed rock priQr to
beginning constructionactivities.
JEHfHSDNCDUNIYDCO
. Element#3 Control FlowRates " . .' .
o .' Stormwater will be tot,ited-to'the' marine water' of HoodCanal;,no detention
is required.
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Elemenf#4fnstallSedimentControls '."'. ..... . . .' . .. . .... '.
0: Tominiml;zeetosion during con~truction wattles wfn be installed, see plan
.' forlocatic:mand details-.. '. ...... '. . ...'. .... '. .... ......,... '. .....
'0' The natural vegetation buffer ~iIIremain' down stpr;>e of aH.develc;>pment
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Element #5 StabilizeSOl.ls ,,;.... .
.9 Tomillimi4e the soil erOsion forcesofraindr9pimpact, flowing water,and
'wihderosiondwihg construction, the contractorwillfollow'the~*p6s~a .
-andunwerkedsQiJ.sch,edufesetbybOEJoral.lspils' on site..From' .
,QctQberJ:through April 30, r'l~soilsshaU ,Jemain~'xP()sedand unworked "
for more than2d~ys, a~d.fro[TlM~y t to Septem1ber, 30 ~llQ soils~tiall
. remain'exp()s~d al'1duhworkedf9fmoretlian},daYS:: '. ........ ,. '. ." . '. "
. 0'" AlJexpo,sed sOi,s,causea by' coostructiqnactivitiesshallbestab.iHzed .and
hyorose~ded,or soddeduPQncompletiort.ohheproject. . "
Element#6.Protect Slop,es , " .., '
0' ,the,only'work:pl~nnedon the'.slope 'is the,storriwvater lightlihe pipe ,and;, ,
anchorin,gsystem. This Work wHfoccl,irduringthedry seasontominimize',
'erosiQrfandsedil11entdi~charge.lti$theowner an4. cOl1tractor;s.,
responsibHity,to stabilize the tight line construction zone immediately .
followinginstall~tion. ' "
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'E'lement#7ProtectDrain Inlets ' .
. .' 0 . 'The C?atch basins installed during cOrlstructiOn: shaU be protected 'from
debris and sediment with .filterf;abric and/orsolidcovers.
o ,All catch basins,culvertsand.drainage routes wilfbe inspected.atleast
once a week. and daily'during a storm event by the contractor or other
agentof the owner. .. '..
Element #8 Stabilize Channels and Outlets
o . No chan~elsor outlets exist on site. Stormwaterduringconstruction will "
. shtaef flow across the, site through the temporaryBMPs.
E1ement#9Gontrol Pollutants ,
o All chemicals, liquid products, petroleum products and non-inert wC,lstes
present on site shall be covered, contained and protected from vandalism
and handled in a manner to minimize contamination of storm water.
~. IH:C1EKVIEDoTO minimize polfutantsgenerated by heavy e.quipment and vehicles, all
.",,-,,,.. A J maintenance and repairs shall be conducted using spill prevention
measures such as drip pans.
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Element#10 Control De-watering
:~lrRc~n".("t1.,U"P/ i)'1i 0 De-w~ter~ngis highlyu~likelytobe req~ired dur-ing con~truction.lfde- ,
oj I L, \,iuru II .IV II Juu watenng IS necessary, It shaU be done In comphancewlththe 2005 DOE
manual.
Elemenl#1,1,. Maintard.,BMPs.(best ,managemehtpra~liCes)
6 It is the contractor's respons.ibility ,tQmaintainthetemporary'erosioh and
sediment control measures and toios,tallth~ permaneriterosion~and
sE3dimentcontrQlmea~ure$setforth inthis'reportandplao. .,' .' ..' '-.. _
._ 0 . After construction . iscomplete,maintenanceofpermanent erosion'aQd
. sediment OQntrolmeasuresarethe owner'sresponsibility.-__ .... ". .'
o AU te~porafYero$ionand.lSedimentcontrQI. measuresshaU,be.rell1oved
wtthin<~Odays ~fterfioal_$i~erstapilizati9n is .achIevedQrasneedea if -
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Minimum ReqUitemenf #3S6uipeCo~trOIQfPOllution .,'
.- . .As stated inElemenf#9,to minimize pollutantsgeneratedpYheayyeq qipmenf
.. -al]dvehiclesJallmaintenanceand repairs shaH be'qpnducteQ using spill
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prevention mea$uressuch as drip pans.' . .....' . .'. .... .
'. ..Source. confrOI ofpolltitants during construction .c~m'. b~maintained".An;thi$ -lobhy
. 'ifnplemenfing .th~temporarY'E3ro$lqnahds.edimentcpntrol'mea$ures$etf()rth. . H"
Long:-terms94r1S.e control.of pollution iis.theresPonsib!Hty6fthe(prope~owoer, -
and includes all categoriesofhousehold~nd yard chemicals', and'poI19t~nts..' ."~
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MI~imum.Hequirement. #4.Pre~ervatiQn.ofNafuralprain~ge.' systems.and..'Outf~IJs....,.~'
.. Th: natural d r:ai.nage route 01"1 thesit~is.sh~etflowtothe east and, down the sg. ..
g1,aririebluff. . This, bluff is' heaVily vegetated,~mdwm rerhain vegetated after .g
,corlstructio~. . ,.... : . .... . '. .. '.. ' ....... . . .,.. ~ ..
· The vegetat!3d portion of the site will continue to sheet ,flow as itdid prior to .~
,development.. '.' .~.,
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Minimum Requirement #50n~site Stormwater Management .' . '. . .". . ..
· The roofdownspoutswill be cppneqted to.a .cQoveyan.ce. system that willdir~ct
tl1estormwater to.the base .ofthe' madnebluff minimizin,g .the impacttothe bluff.~
· Routine observation and maintenancaby the owner,ishighlyrecorrmlendedand
neces$aryto maintain a functtoningdrainage system on site..
IV. CONCLUSIONS
Prior to breaking ground the temporary erosion control measures set forth in this report
and plan shall be instaUed on site to minimize erosion andcohtrol sed,iment discharge
dur,ing construction activities. These measuresinclucte a crushed rock accessdrivaway
and wattle. During constructionternPoraryerosion control measures should be
inspected regularly and repaired as necessary. Once the site is developed; reseeded
and stabilized these BMPs. can be removed.
Due to the outfall to a salt-water body no detention is required on this site. RunofHrom
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t..he.p. ro.' po. s.e...dJ.m... .pe. rvto.. u.s...d.e. ve I. o. pm...e:nt witlb....ec..oll.ected..... via.:'~.gu. ti.' e. [s,'dow.'n.s. po. u.tsa....od.. ":..:~<. .
catchbasfns and directed to a tight Ifne that Wm direct thestormw~terto theb~se.ofth~'
marine bluff. A yard drain, catch basin, . shall be installed . ~ft~r aU inlet points ~fnd'prior,
to the tight lil1e. This yard drain Ibcation sh a. U, be outside,ofthe,rpanrie bl.uff buff~r;~ee
plan for:specific'locatiori~ This yarQ drain . shan actasaJeaftrap tcirertlQve:yegetatjve'
debris thatrnayglo'Rthetightline~', .
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This" reporthasbe~npreparedJ.oi'.th~eXcIUSiVelJSeOfGaryHa.ckn~Yfor his proposed .
.constructionofa..privatehome.....the reccmll;nendation$.jn'th~.. reportapplyol1lytQ tlie.
propertyJhc:llwas examine(tarld,theY.a.re nolappli9ab1eJo Qtherlocatio~s. The' . .... ..... ;
investigation~nd. recortlrTl'enQations p(;mtairiedlnthJs[epoltare,ba,s~d i~pOn: '$it~cqndi~
.tions.as. theye,xisted atttlE~time' of?ut srte)f1spectioDS::[>urirlgqonstruqtiprl', 1f ..,' .... '.. .
. sUbsurf.aceorotherCQnditions:aredis~overed that~are significcintly'diffei'enUrotnth.qs. e '.
> . _, i: : --': _ .:"-:": _':" .'" :.- '_:'_ ,- <. '. .- ,,_' .,: __" .', -_ :" :_, __" ,>,: '-", _"t', "-_ _'.. _', '; '-_ _' ,_,--" -.-'::,,
described'jn.th~'TeportiNTI'~houlctib~~dvised',atonce' soithat. Y'/~'canJ~ViE;!w..tt1e..'" ...... ......
. conaiti()nsandrecOnSide(ourl"ecomm~r1datjohs"Wher~tleces~ar\l. .tln~nticipatea'$()il
.condition~arecommQflly'enco'urit~redOQ'c.onst[uqtionsjteSl::espepially..~hehth~ .... '. ..'
'~opography'nas'b~en'alter4ad years. a.go~ : Such "unexpe~tediconQiti6hsfre.<luemly"r:~quir-e
,'that additional expenditures be made to attain a properly constructed project. We'
recomn,end tMat a contingency be established ,in the' project budget and sched~le ,10
cover.Urlexpected'conditions.
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KaleWaddeU,P..E. .
.' Design Engineer
. G:\Gen\Kate\Drainage DOE2005\Hackney\drail1age report.doc
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A w.~~o ~~~ o\m~V\ -to tfjl~-H\i\ e dowl\6l~c1leq -\-+rop c atvh ~(l. W,-u, UAt~ Of'Tee
sa DOOmSPOUT COUECOON. UNE DET~1.. LEAF mAP ~TCH BASH Kfm sam =t. L "lll"""::= = . .. = ..:;:.. ~ I
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, .' I SCALE IN Fff.T
. . I INSTAU. WA17lE OR CQUlVAl.DIT !ROSION CONTRO/.
BAI/1/ICR DOWN SLbPC OF" ALL CONSTRIJC7ION PRIOR
I TO BMAK/NG GROUND.
I SEe WA17lE DETAIl.
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SLOPe ORMWAY
""" CATCH BASIN
.."'HOPe PIPe 0 2:< _. SLOPe.
sa .OOWNSPOUT COI.LCCTION UNE DETAIL
PLAN VIEW
SUPPORT CAIJLE ",' BC A
CONnNf./OI:JS LENGrH OF
Co4LVANIZED I17RF-ROPe
. OR CABLE (1/2 INCH ....,.,.,,)
./ FINISH GROUND SURF'ACC
fNSERr "''''l.ENG1H OF
2".(WV IRON PIPe
IN$1DC OF QfOSS 84RS
FORlJCD OF HDPC
PfPC (ltITH CAPS) AS
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SUPPORT CABLE
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It'EZ.Dm HDPC.7Il'
N.J. C4PS oN now DISPERSER
I .' 10 IK - AND RD/C1IINU
~ ""'" or OF SUPPORT CABlE AROUND
HORIZONTAL I/EJiBER5 Of' OISPERSER
AS SHOWN. use A 'fJINIMU/II OF J CABLE
CIJF1S OR SMtAR METHOD OF FORItIING
~ 'i!f~uJ:J',J,. CABlE /$ 'AUT FOR
'---'LOCA1E'-80T7'OII OF DISKRSER "2" 18
INCHCS ASOYE UNE or ORDINARY HICH
.."" (VEGETATION UNC)
" -. PlACe 6 - 12 MCH DIWEliR S1tWE$ CJNOER
" .'~. PIPE FOR tROSION CONTROL.
STONES TO EXTEND A ~ OF .2 FEEr
moM HORIZONTAL PIPE IN ALL DIRCCOONS.
CABLE ANCHOR DETAIL
NO SCALe
O - TO CCNS1ST OF
r. 'l" " - SCCT/ONS OF
.' . . 'f GR-6O SIR PfACCD WHERf:
1NDICA1CD WITH J- CLEAR
. L' -.J' MID J HOOPS OF' IJ GR-40
. BAR MMr SPM:ED ALONG
ANCHOR
CCNCRCrE m Be 5 'S4CK
TIGHTLlNE PIPE' DETAIL
NO SCALC
D/SPCNSCR TEE-
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DOWNSPOUT
DOWNSPOUT CONNeCTOR
(NOT TO 8E: WATCRTIGHT)
BACKFlU GROUNO nEVATION
PIPE: 8DlDS AND
CXTCNSIONS AS NCCDCD
18" MIN.
D<PTH
"x,,"~4" 1&
,,", COUCCTlON UHE:
AT 2" MINIMUM SLOPE
NDTC,
DO NOT CONNeCT FOOTING DRAINS TO
D/WNAGE: SYSIDI.
.QOWNSPOUT TO' COLLECTION LINE DETAIL
NOT TO SCALE
PFJ/FDI/ATCD
FD07ING ()RAJN
1tMT7lE CASING IS A BKXJEGRADASI.C
~ PI.ASTlC OR SIlI/UoR CNCASIN<~'
gc=IH'.~~.. .....
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,.. SOU4RC STAKES DRIVEN THROUGH
/ WArnE E\IERY .I' - 4'
8. - 10. $1RAW
F/U.ED...mc
STRAW WArrLE~STANDARD STAKING
NO SCALE:
NOTE:
OVERlAP WAmE SPLICES
A MINIMUM OF 4 FEET.
NO BUTT JOINTS.
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NO SCAL.
RESIDENTIAL DRAINAGE & . EROSION CONTROLNOTES
A. RCCUlAR IoI.4INTE:NANCE IS CSSCNTIAL TO /MINTA/N PRDPCR PE:RFORI./ANCE: Of' mE: Df/AINACC SYSIDI. IT IS THE:
OWNCR'S RCSPDNSI8/UTY TO MAINTAIN A FRCC FLOWING SYSTCM AND DBSCRVC IF THE: SYSIDI IS OPB/ATlNG
CORRE:Cn. Y.
8. PRIOR TO STARTING lAND DISTURBING ACTMTIE:S mE: CLEARING LIMITS MUST 8E: _. mE: TRE:CS WITHW THE:
ClEARING THAT W1U Rf:JI)JN IlUST ec _CD AND CROSION CDNTRDL I./CASURCS IlUST ec INSTALLCD.
C. ~ATC DlSTlJReco stOPE: WITH N4TM" PlANTS AFTE:R INSTAU.lNC 8URICODUnET PIPC.
D. SE:E: ATTACHCD RCPDRT.
E. VARIOUS tNSPECT10NS AMl' BE REQUIRED DURING CONSTRUCT1ON:
,. !ROSION CDNTROI. INSPCCTIOI/.
2. INTE:RIM INSPCCTION, u.oy 8. RCOUIRCD.
J. FlNAl. INSPECT1ON.
RlECEIVJe
OCT 1 0 2008
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