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Home My WebLink AboutWashington Street 1620 Drainage Improvements+IIII1$(D(9C)oozoFqcLc)z-t3uJoJJzU-Fuio&Uoooaoozoz=koo)Eoazbo2>L-GtsEiur.r 246E=o<Eu=oJutuooo?iIJJ7<)-oz85rgnL6hoN-,,iT/:LtsIFLotr)J=Uo6p(f)Fo--!Fa()t00!ooff0df{16qtoztnz!!llvcFIu)oF3uoudd'dc-ozaoNOlldlucsJasIN:nwoc frc No clsv€ clsl^3a89986 VM 'ON3SNMOt lU0d.IS NOISNIHSVM TE9'[ueoAIACcu\8FIoocNtrtnof,+)ert90 LI0z0z dlsuoFurqseM'puasuMof uodsCuaprsau uosceyslueue^ordull rele/nurols pesodorduEld eFeureJoNFE$ F{5E= c)NoFlFUuo.aaora.n u'dlr!,.oUOZ'it.).0:parpsatco i ltlsEilptof,tt9O1L\taSpatppdntOOt0a\quatrra^ordrutiarpauorsrr9olr\..u.psiguo\rcy\:orli4dOvJ- (::u_Wa::::lal\:,0.:.1rry;!r.+,/',, ?CiZFacCE-IEdFflla7zt-U=aUOl-.L l\il@F@Ld coLlJ cOEo-)'a*z>O-i+-tn-x >Bz Y +23 X e=9 F =E a nv Es ilf $ =fr dI :" F-z= a c! zfr :Z a o o+ -v Us Z HE E tr ;= 5 t: o r ft<l) o dm <J :rdo ;6a o_ik 3oH :E* uEz >io ui"t ,zL z;. o<P ;Q-< iiLo d_d L?-o..^=XEE=2uEaOE\)ZxhD45_@::]UJP;;!<:JFOE]lJcIOE-Oo--=a<EEUol-E<Ocu>aAd:E:az_U>(tO^?zOOI=akoLddoYUI:ZU<r^cd>H9qE(nCxqdz;<FU=Yz(Y=to4x=oOOZH(-uul='t=a>ul=Or)LFL;iZO,/)OtrLE=t<O-t!d(JJozUI(,LrIIiaU:>lolZL<z-uH=^F ---F6_.1rtil,tllliFItilixJ-UJA=z2z*, o-!ltr:fF<O>-!_<zt)Hild=tr:)-)-{1r(J(Joi.rqZ\irOOE.(5z-zOT^UZ'z )tiJ = LLIft-d >;XE=ur(J0--fioe.rL^idia"'--aUJFFzlYto=IFE.tilrdF=oELd!lLv)aU)tllOtroo(Y co oo6O)60cr)o)ooci!!F h I<;XE=unf,,ii.II' j :;'l-fir5l.Et F t.I dtgu = I'-3-H_ |3e IHH IIFF:ozJ(JEz?(ot."1,qtil9tlIIIaldlol>ld9il-=drog*(,FHo.o<i zzHE=E-Hi;=>>fr:'9FHseYuaiS=o'uiDr;a; rfi*EgF E;EqfrFgE€ile',7L.vL ,=9EaH,gsEsg<goioEOFO(J('FlozuJoIO66:8dOTdo5-osa;ESooig-.t! o9.9p.9t<:ooEEp'ag5dU,:O1loaiE', oiobftu0fl\' , tiusdiR@,5r!-E:! '\q{, I"b';k--9EAtVEU-=2<:EE3uiEPaU=HtrEFLN J>LOo<3O.ntr>ii65,;EoEE=9H26tr i-^H;; a -iiE<u6ofrZaoGn.6\5,;=E-dtsAEEOZ+<6q>tootr!lq:iutE".iO-r'rLrrrT<tZO.:Ol=>(n=usdir6{E>^ U^Uts;|a:L"za6t!.!aO-Z<TEZOOmFc<oo/N57' 26'33"WNOICINIHSVMt3lulsF{ 16 FT 2 FT PONDING DEPTH EXISTING GRADE _PROPOSEO GRADE 3.FT .-z-INCHES WOOD CHIP MULCH 9EE NOTE 2 -OVER-EXCAVATE GRADE BY'I.s-FEET FOR RAIN GARDEN SOIL FILL RAIN GARDEN NOTES: 1) RAIN GARDEN SOIL MIX lS 60% SCREENED SAND AND 40"/" COMPOST BY VOLUME. PLACE IN EXCAVATION IN LOOSE LIFTS. DO NOT COMPACT. 2) COVER W|TH 2 TNCHES WOOD CHIP MULCH. IMPERVIOUS AREA THAT RAIN GARDEN MITIGATES IS APPROXIMATELY 1,890 SF. 4) TOTAL RAIN GARDEN TOP SURFACE AREA IS 138 SF.RAIN GARDEN PROFILE 1 5) STORMWATER RUNOFFAND RAIN GARDEN PERFORMANCE WERE SII\4ULATED WITH THE 2012 WESTERN WASHINGTON HYDROL0GY l\ilODEL (WWHM) SCALE: NTS 9Z 6) CONVEYANCE DESIGN FLOW IS LARGER THAN THE IOO-YEAR PEAK FLOW. 7) PLANT RAIN GARDEN AS FOLLOWS: ZONE LOCATION COMMON NAME SCIENTIFIC NAIV1E SPACING NUMBER OF PLANTS I BOTTOM TO 1+ FEET SLOUGH SEDGL carex obnupta 121N.10 SI\4ALL.FRUITED BULRUSH cirpus micrccarpus 121N.10 2 +1 FEET TO TOP SALAL Gaultheria shallon 181N.14 CREEPING ORTGON GRAPT Mahonia repens 24-tN.14 -6" CLEANOUT WITH THREADED ENDCAP ON GRADE 10- oR 20-Fr (SPECTFIED ON PLANS) NATIVE SOIL '18-INCHES RAIN GARDEN SOIL SEE NOTE 1 ll 6' PERFORATED ] '1.5 TO 3.O.INCH GRAVEL BEDDED ADS OR PVC PIPE UNDER PIPE MIN 6-INCHES DEEP TOTAL DEPTH 2.5-FEET tNFtLTRATtON / DISPERSION TRENCH SECTION.._ 2 -scALE: NrS g?. TRENCH DRAIN 0.3 FT 3) 6" CLEANOUT W|TH THREADED ENDCAP AT 45 OEGREE WYE WITH PIPE_, WASHED DRAIN ROCK 1.5-3.0 INCH DIAMETER NATIVE SOIL ' INFILTRATION / DISPERSION TRENCH PROFILE 3 EXISTING GRADE- 1FT MIN LEGEND 0.3 FT - 2.5 Fr 2Fr TRENCH DRA|N DETATL (WP.)_ 4 SOALE: 1" = 1' 93 i t}{li 1 3 ?020 MIN.6.INCH GRAVEL BEDDING UNDER PIPE ffi ffiw ffi *ooo.r,r, ffi .o^.^rr. 4FT -, INFILTRATION/DISPERSION TRENCH NOTES: 1. TRENCH GRADE MUST BE LFVEL. A NOTCHED GRADE BOARD SHALL BE PLACED ON CONTOUR TO HEIP ENSURE THAT WATER IS DISPERSED EVENLY THROUGH THE VEGETATION IN THE FRONT YARD. 2. IMPERVIOUS SURFACE THAT WILL BE IVITIGATED TO THE INFILRATION / DISPERSION TRENCHES IS APPROXIMATELY 1,OOO SQUARE.FEET. 3. APPROXIMATELY 9.0 CUBIC YARDS OF SOIL WILL BE EXCAVATED AND REMOVED FOR THE TRENCH. EXISTING GRADE 2.5 FT NATIVE SOIL- E 3 I E .g E c I 4 5 oo E B 9 da o s 6@oo,.o6gz>oiiaZ =a-z?= =tsiFNGoo o B oN fl; g d E #cl()zor cLap od N o 6 c o c) Eq) o CL .E (,'L =o)c!it=aE o U'!t(1,ooco o. co b0.=!o(s =<tC o)oc =Fcoo- o)oc0)paoE,cooooY sueer 2or 2 c2 SHFEI REFERENCE NUMEER; 4 5 c D 7-2 SCALE: NTS c2 -6" PERFORATED ADS OR PVC PIPE DRAIN ROCK NATIVE SOIL RAIN GARDEN SOIL \Asoect l.o*trrrrrNG August 25,2021 Brandon Maxwell, EIT Public Works Department City of Port Townsend 250 Madison St Port Townsend, Washington 98368 Re: Construction Completion for Kacson Residence Stormwater Improvements PermitNo. SDP18-029 Aspect Project No. 170641 Dear Brandon, This leffer documents the completion of construction of the Kacson Residence Stormwater Improvements project under permit number SDP18-029. The improvements generally consist of two new infiltration/dispersion trenches, a new rain garden, and decommissioning of the former piped system. I reviewed progress photos provided by the contractor, Shold Excavating, during construction and completed a postconstruction inspection on July 27,2021.The improvements were constructed in general accordance with the engineering plans stamped l0ll2l2o20. There were two minor changes that the contractor reviewed with me, and I approved prior to construction: o The contractor substituted 4-inch trench drain for the 6-inch trench drain specified for the driveway because of lack of availability of the 6-inch product. . To minimize soil disturbance, the contractor left the base section of the former catch basin in place after capping pipes that entered and exited it. The base section was buried, and no surface expression remains. During the inspection, I measured the overall dimensions of the infiltration/dispersipn trenches and rain garden, and setback distances of the rain garden from the house and neighboring property. The facility sizes and setbacks are consistent with the plan. Photos taken by the contractor during construction and by me during the postconstruction inspection are included as an attachment. Some bare soil was left in the lawn area where the former drainage system was removed/capped. Mr. Kacson indicated that he intends to seed any bare areas of the lawn with grass in the fall, once rains return to support grass seed germination growth. If you have any questions about the change in discharge location and sample point, please contact me at oreesp@aspectconsulting.com or 206-838-5844. -)a City of Port Townsend August 25,2021 PermitNo. SDPIS-029 Sincerely 8/25/2O2t Owen Reeseo PE Principal Water Resources Engineer oreese@aspectconsulting. com Attachment: ConstructionProgressPhotos cc: Gene Kacson V:\170641 Kacson Residence Stormwater\Deliverables\Postconstruction lnspection Letter\Kacson Closure Letter-Final-2021.08.25.docx 38980 Page2 ATTACHMENT 1 Construction Progress Photos Cify of Port Townsend August 25,2021 PermitNo. SDPl8-029 Photograph 1. Upper infiltration/dispersion trench excavation with grade board. Photo by Shold Excavating. City of Port Townsend August 25,2021 PermitNo. SDPl8-029 I Photograph 2. IJpper infiltration/dispersion trench excavation with perforated pipe and drain rock. Photo by Shold Excavating. City of Port Townsend August 25,2021 PermitNo. SDPI8-029 i, '',1t Photograph 3. Lower infiltration/dispersion trench excavation. Photo by Shold Excavating City of itort Townsend August 25,2021 PermitNo. SDPl8-029 Photograph 4. Lower infiltration/dispersion trench with perforated pipe and drain rock. Photo by Shold Excavating. City of Port Townsend August 25,2021 PermitNo. SDPl8-029 Photograph 5. Capping former conveyance pipe. Photo by Shold Excavating. Cify of Port Townsend August 25,202I PermitNo. SDP18-029 Photograph 6. Capped pipes at former catch basin, prior to removal of riser section. Photo by Shold Excavating. City of Port Townsend August 25,2021 PermitNo. SDPl8-029 Photograph 7. Completed upper infiltration/dispersion trench. Photo by Owen Reese, 712712021 Photograph 8. Completed lower infiltration/dispersion trench. Photo by Owen Reese, 712712021 Cify of Port Townsend August 25,2021 : .'r,. 4 Photograph 9. Raingarden. Photo by Owen Reese, 712712021 PermitNo. SDP18-029 Photograph 10. Regraded area at former catch basin. Photo by Owen Reese, 712712021