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.:- � <br /> ' !. <br /> � <br /> _ . � <br /> i <br /> J �� � <br /> I <br /> I <br /> I <br /> � <br /> ��� 7 <br /> : <br /> ��.....� � <br /> � � , # <br /> �� , , . , , , : , _ , ,, _ <br /> � � I PACIF C � <br /> � 1980-I12th Avenue N.E. I <br /> �N� P.U.Box C-97304 <br /> � Bellevue.WA 98009-7730 <br /> p I <br /> pHd I <br /> � '�c��r"a�t� <br /> ��g � '��(��;��1 '�� �'i I <br /> � " <br /> H JUL � f, 1°�� <br /> �M y July 25, 1989 ' � J ` <br /> � File No.: 3-320-0101-10 . � <br /> .......... .............. . <br /> �w CiTY OF EV[RETT � <br /> � � P_ubllc Works Dept. � <br /> . �� Mr. Phillip E. Schneider <br /> Washington Department oC WildliCe ' <br /> 16018 Mill Crcek Boulcvard ; <br /> Mill Creek, 98016 Re: Norpro Sitc Improvements i <br /> Dear Mr. Schneidcr. <br /> I was pleased to bc a61e to discuss the project with you during our July 17, 19H9 telephone i <br /> conversation. In particular, the storm water autfall Corm the projcct site into the Narbeck Crcck , <br /> drainage, which you determined will not requi�ed a hydraulic project application (HPA) permit. <br /> This letter is presented to document our mutual understanding and will be submitted to the City <br /> of Everett as the proponent's response to the cxamincr's requirement Eor a HPA. <br /> ���� The Norpro Site is located at the noRhc:ut corner of the intersection of Merrill Creek Parkway <br /> � and 23rd Drive West. Thc existing sile is densely wooded and generally drains to the northwest <br /> I into Powder Mill Basin and northeast into Narbeck Creek (which we arc addressing herein). <br /> ��, T'he area draining into Narbeck Creek will remain unchanged. The southern part of thc Narbcck <br /> �� contnbutory arca "B" shown on thc Existing Drainage Condition Detail on shcet Cl of 3 (encloscd), <br /> will be a paved "trucking" area. The northem part of"B" will be graded and seeded. Both arcas <br /> � will be shaped ro indepcndcndy function as retention/detention ponds. <br /> �;���,�.i� <br /> I �"'� Runoff from the paved (southem) trucking area will llow westedy, then to thc southcast corner. <br /> All runoff greater than 0.3 cubic Ceet per second (CFS) will bc impounded. The top of thc <br /> impounding berm along the castside, with it top elevation at 585.5 feet is thc lowcst containment <br /> i ��� perimeter. Water will bc relcascd from thc pond into a grassy swalc (biofilter) 202 fect long. <br /> Similady, runoll Gom the northern part of "B", will also Llow castedy, then to the southcastcrn <br /> � corner. Once there it will be impuundcd, relenscd at 03 CFS through an orificc in a Lloatablc <br /> � �� � material scparator, thcn pipcd to thc outCall. <br /> The �tinoff from both arcas will then bc convcycd vin the buricd outfall pipe to a energy dissipator <br /> � and quarry spails dispersion bcd as it is rcleased into thc drainngc. <br /> ���. <br /> i <br /> I'_061 JS1.1_'s0 Pus('-OGI�151-a09J Plannine• [n;;incering• Surveying• Landscape Dc�ign <br />