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allow for this project to pay a fee in lieu of detention (assuming this project gets permitted <br />after the new policy goes into effect). The project team shall be aware that the proposed draft <br />policy requires that lawn be used as the pre -developed condition rather than the existing site <br />that was allowed with Interim Policy 2-11, this would likely result in a larger detention <br />facility being required for the project. <br />9. There appears to be storage pipes in the parking areas east of the building. If this project gets <br />permitted before the new policy goes into effect, these storage pipes will need to be included <br />in the pre -developed condition (existing site) in modeling to confirm that the proposed <br />project will not increase flows to the combined sewer system. The drainage memorandum <br />needs to be updated to include this analysis for construction permit submittal/review. <br />10. The project shall not locate any new structures or expand existing structures within the <br />easement for the 40-inch effluent transfer pipeline. This pipeline is an outfall for the <br />treatment plant and is a critical facility. Take extreme caution to protect during construction. <br />11. Per Ordinance No. 3071-08, since the project will include a centralized kitchen facility, the <br />kitchen area fixtures/drains must be plumbed to a properly sized gravity grease interceptor. <br />12.. Plans should include kitchen fixture layout and drainage waste plans showing all <br />fats/oils/grease (FOG) producing fixtures, grease waste lines, connections serving all kitchen <br />fixtures/drains (few exceptions include hand sinks, condensate drains), and details to include <br />an exterior gravity grease interceptor showing sizing calculations per the current Plumbing <br />Code/City of Everett codes. <br />13. If the layout includes a food waste grinder/disposal, the minimum grease interceptor size <br />doubles, and a solids interceptor is required between the grinder and interceptor. <br />14. Installation detail on the plans shall reflect the required internal plumbing, including an <br />extension of pipe on the tank's inlet tee (approximately 1/3 of the water depth or 16-18inches <br />for the Grease Interceptor vault currently specified). The detail should also note/require <br />manhole access be positioned over the internal plumbing to facilitate inspection and <br />maintenance. <br />15. The old grease interceptor shall be retired in accordance with plumbing codes and shall be <br />reflected on the construction plans. <br />16. Fixtures from science or lab stations are required to drain through neutralization tanks, either <br />a central one or small ones at each fixture that may see corrosive liquids. <br />17. Plumbing/Mechanical plans should include an equipment/fixture schedule and show <br />calculation of drainage fixture units from the kitchen (i.e. sizing for the grease interceptor). <br />This should document there are no more than 35 DFUs from new kitchen, if not 35 or less, a <br />larger grease interceptor volume may be required. The 1000gal system noted may be sized <br />appropriately; however the plans shall show the calculations to demonstrate that size is <br />compliant per code requirements.. <br />18. Compliance will be reviewed/ confirmed once plans are submitted with permit applications. <br />Please contact Charles Johnstone with Industrial Pretreatment (CJohnstone@everettwa.gov <br />nofl'O <br />Page <br />