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August 19, 2019 <br /> <br />Mr. Brad Shelton <br />Regional Water Quality Control Board <br />Central Valley Region <br />11020 Sun Center Drive, #200 <br />Rancho Cordova, CA 95670 <br /> <br />Dear Brad: <br />Subject: Forward, Inc. Landfill, Waste Management Unit FU-19 Design Report Comments <br />This letter is in response to your 16 August 2019 comments on the Design Report for <br />WMU FU-19 at the Forward Landfill. <br />Question 1: Operations Layer Specification <br />A typical sample of operations layer material was collected from the operations layer <br />stockpile on 13 August 2019. Laboratory testing is currently being performed and the <br />results will be available shortly and will be submitted to the CVRWQCB. <br />Question 2: Pipe Velocity Calculations <br />Pipe velocity calculations were performed and are attached. The pipe velocity calculation <br />conservatively assumed that flow within the 6-inch HDPE SDR 11 LCRS pipe (inside <br />pipe diameter 5.35-inches) would be approximately 15 percent of capacity. The <br />calculations were performed for the pipe at both a 0.65 percent slope and a 1 percent <br />slope and the pipe velocity ranged from approximately 1.2 to 1.5 feet per second, which <br />is within the EPA recommended range of 1 to 2 feet feet per second. In addition, a 10- <br />inch HDPE riser pipe will be connected to the 6-inch LCRS pipe, to allow access for <br />camera inspection or potential cleaning of the 6-inch LCRS pipe, if necessary. <br />Question 3: LCRS Inspection <br />A 3-inch solid HDPE pipe will be added on the west and east sides of WMU FU-19 to <br />allow LCRS inspection testing. The 3-inch pipe will be placed at the top of the LCRS <br />gravel on the base of WMU FU-19 and will be accessed through a riser pipe to allow for <br />a slug of water to be introduced. <br />LEWIS ENGINEERING <br />98 Ramona Ave., Piedmont, CA 94611 Tel: 510.601.7223 Fax: 510.601.7206