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CTO <br /> DAVID EVANS <br /> AND ASSOCIATES INC. <br /> DATE: October 12, 2017 <br /> TO: Sabrina Fandler, EIT <br /> City of Everett: Public Works Department <br /> 3200 Cedar St. <br /> Everett, WA 98201 APPROVED <br /> PUBLIC _ O"KS DEPA'.TME IT <br /> Z FROM: Brett Nicholson, P.E. <br /> BY ren i ili , !u1 4 <br /> ICC SUBJECT: Storm Drain Revision DATE /O/I / oiF <br /> Q CITY OF EVERETT REVIEWED FOR PERMIT <br /> PROJECT: UGDX-0003, PW 1�s-0i 4 S/ /S 1V fir-le/11 ir <br /> FedEx Facility: Hardeson Rd <br /> CC: Leon Surdyk, CADMAN <br /> WMs. Fandler, <br /> Approval of the following revision to the FedEx Storm Drain Plan is requested: <br /> -Replace the proposed 18" storm drain on the basin slope with two 12" HDPE storm drain pipes above ground <br /> with appropriate pipe anchors. <br /> -Eliminate the Type 2- 48" structure at bottom of slope and install rock headwall and riprap settling basin and <br /> apron for the two 12"diameter HDPE pipes. <br /> The additional flexibility of the 12" diameter HDPE pipe will allow the pipe to match the steep slopes of the <br /> pond. Placing the pipe above ground will improve constructability and maintenance of the system and meet the <br /> requirements of Section 4-2.5(2) of the City of Everett Design Standards and Specifications. Sliding sleeves <br /> located near the discharge end shall be used to address thermal expansion and contraction,as specified in Section <br /> 4-2.5(2). <br /> Please let me know of any comments on the attached plan,and if it is okay to authorize the contractor to proceed <br /> on the basis of the attached plan. <br /> Sincerely, <br /> DAVID EVANS AND ASSOCIATES,INC. <br /> • <br /> Brett Nicholson, P.E. <br /> // )) <br /> 1620 West Marine View Drive Suite 200 Everett Washington 98201 Telephone: 425.259.4099 Facsimile:425.259.3230 <br />