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. Pacific Topsoi�s Rhrerside sfte-Stortn Dreinage Report <br /> GFK Consulting Inc. <br /> ❖ EXECUTIVE SUMMARY <br /> The subject site is currently used as a processing area for clean wood debris. This drainage <br /> investigation and design has been undertaken to permit this activity with the City �nd the <br /> States NPDES program. The site is comprised of approximately 8 acres and is located at the <br /> north east comer of the City of Everett along the Snohomish River in the Rivers+je Industrial <br /> park. Prior to its current use the site was used by Weyerhaeuser for wood treatment and <br /> equipment maintenance. As a resuR, this site has been remediated to contain hazardous <br /> materials; a portion of the site has an asphalt cap, and a portion is capped with only a soil <br /> layer and is cuRently covered with grasses. <br /> The scope of the contamination and subsequent remediation adds constraints to the use, <br /> grading and drainage features considered. The Pacific Topsoils processing operation is <br /> conducted on the paved area, the meadow area is used for storage of non hazardous <br /> materials only. <br /> The two surFace treatments create two sub basins within the site. Runoff ftom the paved area <br /> is collected within perimeter ditches along the south and east edges and is conveyed to the <br /> south east comer where it is then discharged directly into the Snohomish River. Rainfall <br /> falling onto the meadow area is observed to infiftrate into the ground as originally designed. <br /> As a result this design will only consider runoff from the paved area only, and since the <br /> Snohomish River is listed as a receiving water body, only a water quality feature will be <br /> engineered. <br /> Per the Snohomish County Soils Survey, the soils in this area are Urban land. Refer to the <br /> Soils Map in the Appendix. <br /> ��y � � I <br /> •.� �.1�{Y ` <br /> y � • �� S <br /> t 1 ��,q.�1. z �� ��,b, I <br /> t <br /> � �' i <br /> " � ' <br /> °�'�,*�-� y,� .,� �� <br /> ,_ ,�.. I <br /> h�q ee'"�`y.. . ' I <br /> ... ,� �� �.�a <br /> ,`p�:,�' � j <br /> , 1 �� ) � <br /> F� rI' I <br /> . - ���'w�� � <br /> � ' <br /> y,. ' , , i��,w i � i <br /> � ., . . ...� 1 MF 196i; <br /> 0`p� t �`: ,x I ue ive <br /> F � <br /> , � $ �,3•� ( � <br /> � �. � � �, k <br /> ,:THST � r � `� ' <br /> '� / <br /> ��� <br /> Vicinitv Maa <br /> 8l1012010 2 �I 1 <br /> C:\Project data\Project fiies\PTopsoils Rlverside site\Reports\Riverside4.doc !.� <br />