1125 80TH ST SW 2016-01-01 MF Import

3304 252nd St, NE Arlington, Washington 98223 Engineering Telephone: (360) 435-0449 it Diversified Engineering Services Fax: (360)435.9008 September 8, 1995 File No.: 0100.01-01 Mr. Kirk Brooks Development and Permits City of Everett 3200 Cedar Street Everett, WA 98201 Dennis Petroleum Warehouse and Office Facilily Dear Mr. Brooks: Enclosed you will find the revised storm water calculations and the revised drawings incorporating the comments made in your memo which were discussed with you and Jane Zimmerman at the meeting held on August 28, 1995. Below are the specific items that have been addressed either in calculations, revised on drawings or both: 1) According to the soils report prepared by RZA the subsurface soils starting at approximately two feet below the surface is glacial till. Therefore infiltration of storm water would not be feasible and is not recommended for this project. 2) The off-property area draining to this property has been taken out of the storm water analysis and the control structure has been redesigned respectively, if was found that the wet pond live plus dead storage was just under the volume of a six month storm which seems to be within an acceptable tolerance. 3) The oil water separator was analyzed to determine the resident time within the structure and the resident time was found to be approximately 54 minutes based on the City's method for determining discharge from the contained areas (see pg 12 of calculations). 4) The water and sewer plans have been revised to show the water line easement, the revised water line connection to the City's water main in 80th St. SW and delineates the private sewer line. It' there are further question please feel free to call me at 435-0449. Respectfully, Diversified Engineering Services SEP 0 % 1995 David L. Parshall, P.E. Principal CITY OF EVERETT Bldg- Permit Counter