Laserfiche WebLink
The comments below were generated from this project's City of Everett Industrial Pretreatment Reviewer. All questions shall be routed through this project's <br />Public Works Reviewer Thad Newport with City of Everett Permit Services (TNewport@everettwa.gov). <br /># <br />Document <br />Sht/Pg <br />Reviewer's Comment <br />Designer's Response <br />Initials <br />any stormwater from outside of the pad from entering the catch <br />basin. It has been observed that the current berm is insufficient <br />to control the 1460 square foot drainage area being proposed, or <br />to prevent flow from outside of it from entering it. <br />4 <br />Civil Plans <br />- <br />2"d Review Comment: The canopy over the east fuel island <br />The design has been revised to connect the <br />(Pacific Pride) will need to be extended/replaced to fully cover <br />canopy roof drain line to the storm system. <br />the bermed area of the fuel island, thus preventing direct rainfall <br />An asphalt berm has been added to the <br />onto the area and mitigate the amount of stormwater entering <br />north and east fueling pad edge to reduce <br />the sanitary sewer. (EMC 14.40.050.B.12) <br />the amount of stormwater drainage to the <br />Designer's Response: As noted above, any Stormwater from the <br />sanitary sewer. These changes reduce the <br />fuel island will be directed to the public sewer in 7th Avenue SE. <br />sanitary sewer drainage area to 883 SF <br />Stormwater runoff from fuel island catch basin (1,460 SF <br />(reduced from the 1,460 sf under existing <br />tributary area) flows through a 1,000 gallon OWS, which is <br />conditions). <br />approximately five (5) times larger than required. Expanding the <br />The City's sewer system includes storm <br />canopy is not required to meet the water quality treatment <br />drainage from thousands of acres of <br />sizing standards. <br />combined sewers. According to the Everett <br />EMC 14.40.050.8.12 states: <br />Sewer Comprehensive Plan the treatment <br />plant processes 20 million gallons per day <br />12. Stormwater, surface water, ground water, artesian well <br />on average. The 883 SF of new drainage is <br />water, roof runoff, subsurface drainage, swimming pool <br />insignificant compared to the average daily <br />drainage, condensate, deionized water, noncontact cooling <br />flow. Using rainfall estimates from the <br />water, and unpolluted wastewater, unless specifically authorized <br />City's web site the volume of runoff from <br />by the director. <br />the 883 SF is: <br />The code does not make any reference to a canopy, so there is <br />883 SF x 37.24" rainfall/year x 7.48 gal/cf <br />no code justification for expanding the canopy. It is our <br />X 1 ft/12" x 1 year/365 days = 56.1 gal/day <br />understanding that the City is seeking to have storm drainage <br />from fueling islands directed to the sanitary sewer, which is <br />The 56.1 gallon daily average will have no <br />allowed if authorized by the director. Stormwater will flow <br />impact on the 20,000,000 gallons per day <br />through a 1,000 gallon OWS prior to discharging to the sanitary <br />average being processed (0.00028% of daily <br />sewer, exceeding the minimum City water quality standards. <br />flow). The discharge is mitigated using <br />The existing site was permitted by the City, vesting the existing <br />existing onsite oil/water separator vaults <br />design. There is no Code justification to expand the canopy for <br />that exceed the minimum DOE fueling <br />only 460 square feet of uncovered fuel island area. <br />station design recommendations by a factor <br />Page 4 of 8 <br />