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4 <br /> 4. The proposed HDPE Pipe on the steep slope appears to cross through one or possibly two parcels which are not <br /> part of the development. Easements, or other legal rights, will be required for all properties crossed by the <br /> proposed pipe.See section 4-2.2(2) of the DCSS for minimum drainage easement requirements. <br /> 5. It is unclear based on the plans where the HDPE pipe on the slope will end.A rock spall pad is identified near <br /> Narbeck Creek while a diffuser tee is called for approximately 35' uphill of the pad.The diffuser tee and rock pad <br /> should be located together and should be placed in a location which prevents downstream erosion (toe of slope <br /> minimum.) Please provide a profile of the pipe identifying the ground slope, pipe location and slope,outfall <br /> location and grades between the outfall and the creek. <br /> 6. Based on aerial photos of the site and slope it appears that the area is heavily treed and brushy. Please address <br /> on the plans what clearing will be required for the installation of the HDPE pipe and the measures for controlling <br /> erosion which may be needed. <br /> 7. There are a number of contradictions in the description of the HDPE pipe and diffuser tee on sheet 2.The plan <br /> view identifies the pipe as a 6" HDPE while the diffuser tee detail identifies it as an 8" pipe.The diffuser tee <br /> detail in the middle to left of the page show a sleeved connection to the diffuser tee while the Snohomish <br /> county detail of the diffuser shows a flanged connection. Please clarify what materials are being proposed. <br /> 8. Refer to section 4-2.5(2)for additional requirements for pipes on steep slopes.The plans should clearly identify <br /> that the HDPE pipe is to be continuously fused and identify the type of HDPE pipe required. <br /> 9. The rip-rip pad should extend under the entire diffuser tee and a minimum of one foot above the top of the <br /> sleeve section.The pad must also extend sufficiently far downhill from the diffuser to disperse flows and <br /> prevent erosion. Please identify the minimum dimensions of the rip-rap pad in the plans. <br /> Erik Emerson PE <br /> City of Everett, Public Works <br /> Senior Surface Water Engineer <br /> 3200 Cedar Street <br /> Everett, WA 98201 <br /> Direct: 425-257-8995, Fax: (425)257-8882 <br /> eemerson@everettwa.gov <br /> z�� <br />