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VI. Special Reports and/or Studies <br /> 1. Geotechnical Engineering Evaluation prepared by Nelson Geotechnical <br /> Associates, Inc. dated November 9th, 20017. <br /> 2. Stormwater Pollution Prevention Plan (SWPPP) Prepared by Maher Welaye, PE. <br /> VII. Other Permits: <br /> Only City of Everett permits are required for this project: <br /> City of Everett right-of way use permit. <br /> City of Everett building Permit. <br /> Water Service connection. <br /> VIII. Permanent Stormwater Control Plan <br /> A. Off-site Analysis <br /> The downstream drainage system for the subject site was investigated for approximately 0.5 <br /> mile. The extent of the drainage system investigated consists of mainly underground <br /> conveyance system and through a detention pond. Observations of this system are therefore <br /> limited to evidence of overtopping or flooding and/or silted or clogged structures. <br /> The storm water runoff from the site is directed to the existing 24" storm water pipe along <br /> the east side of 19th Ave SE flowing south. <br /> Runoff collects in a Detention vault DDF1985J02 near the intersection of 108th St SE.A 24" <br /> dia.pipe flows into the vault. <br /> The vault has an 18" dia. pipe outfall.Runoff flows west 375 ft from the vault to a <br /> detention/wet pond(Penny Creek)a Multicell Wet pond.(City of Everett parcel# <br /> 28051900103000) <br /> A 24" dia.CP pipe outfall to private system drainage system at the Silver Lake Center <br /> (shopping center).A 36" dia.CMP culvert on the north side of 12th St SE intercepts runoff <br /> and conveys it east to 19th Ave SE where a 30" dia.CP pipe conveys runoff to the south to a <br /> 24" dia. CMP pipe that outfall to Silver Lake.No erosion at the outfalls were observed. <br /> See the Attached Offsite Analysis Map for additional information. <br /> No Impacts to the downstream drainage system are anticipated.At the time of the <br /> investigation there were not any obvious problems with the system.Catch basins observed <br /> were clear of debris and free of standing water. There was no evidence of overtopping or <br /> flooding observed. There were no unusual conditions within the quarter mile investigation. <br />