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',.< <br /> d� <br /> ; <br /> 1.�Y+l:��^ � <br /> � N <br /> k <br /> � <br /> �'��� c . . � . <br /> '�i � ..,:'m"ES:NE,?sf?+axN,.+n.'• . . <br /> � N�� . .. ' , . . .;l.`_o.. . .. <br /> ��� 1 <br /> ��� I <br /> � � <br /> i ���Q <br /> �y 11 City oC Evcrett <br /> �" H� � August 11, 1989 � <br /> � ���„� Pagc Two <br /> u <br /> �y� by an ovcrflow spillway to be constructed at clevation 5851 between CB #6 and #Z Thc <br /> � maximum depth, which occurs at CB #6, will be 1.12 feet (13 inches); the bent, <br /> triangle-shaped arca oCthc R/D storage having a 6inch depth or greater e�ctends 7 fcct west <br /> paved24It ist u� oC he way#of trucks' dcek ns yovcments nthrougl,`and�casu Is raC�c `o � <br /> Th:: drainage and ponding design shown on the plans is the best solution [or siting the pro- i <br /> posed building within the constraints of this site. Altematively, collection piping will rcquirc <br /> - undergroun�R/D storage,which would require either pumping or construction of the requirecl <br /> biofilter (grassy swale) within the native growth protcction easement area. This was not <br /> i ,. ' ' considered practical. OC course, retention/dctcntion storage can bc modified,but it wi11 reducc <br /> stcrage volumcs and/or increasc site operalions and maintenancc problems due to Llat surfacc <br /> slopes and/or numewuc catch basins. Minimizing and simplifying operation and maintenance , <br /> . :,,� of this systcm was carefully considercd — as was the design's scnsitivity to excessive runoll <br /> �` conditions and systcm Cailure. <br /> r �f G, You noted that a Hydraulic Projcet Application permit would not be rcquircd bascd on my I <br /> ' ' earlier leucr with the WDOW. They changcd lhcir position: a HPA has bcen rcquired and i <br /> i��� a copy is enclosed with this package. <br /> � . ` <br /> 7. A cost cstimete on lhc City's form is cncloscd. ! <br /> g, Thc Architect will be providing you with the neccssary information rcgarding the fire water i <br /> ��` mcteddctector chcck. <br /> � <br /> IC you havc any furthcr commc.nts, plcasc call mc at 454-3250. � <br /> � ,� � � <br /> __ � <br /> ;j <br /> s����«�y, <br /> �, 1 WIISEY & HAM YACIFI INC• <br /> � � <br /> � o ! <br /> ' �I� F�cd ,6. Sclle, P.E I <br /> — - - FAS/jf/032(b811.LTR <br /> cc: John Moran, Kcnncth Long & Associatcs <br /> Gene Wright <br /> I <br /> v <br /> { Enclosure.e: Plan mark-ups <br /> Drainage calculatiom m�rk-ups <br /> Rcviscd plans (8-10-89) <br /> Rcviscd calculations (8-8 S. 9-89) <br /> Projcct Hydraulic Projcet Applicalion permit <br /> '� <br />