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SEP-28-98 MON 10:11 AM SAN LEANDRO PUBLIC WORKS FAX NO. 5103521192 <br />G.S. DODSON & ASSOCIATES <br />C O N S U L T I N G E N G I N E E R S <br />September 25, 1995 <br />Mr. Robert D. Taylor <br />City of San Leandro <br />14200 Chapman Road <br />San Leandro, CA 94578 <br />WASTEWATER CONVEYANCE FACILITY TO <br />EAST BAY MUNICIPAL UTILITY DISTRICT <br />Dear Bob: <br />P. 14 <br />Gary 5, Dodson <br />Hamid Sarvi <br />Christian P. 5chumacher <br />Theodore B_ whiton <br />4401 <br />We have completed our study to convey untreated wastewater from the City of San Leandro <br />wastewater treatment plant to East Bay Municipal Utility District's South Interceptor. In our <br />discussions with EBMUD staff, they acknowledged the previous study by HDR and confirmed <br />that the EBMUD system could accommodate a peak, flow of 12 mgd from the City of San <br />Leandro in the 51-inch or 63-inch portion of the South Interceptor. Further evaluation of this <br />option will require additional system modeling and cost development by EBMUD to determine <br />the added cost for expansion at ESMUD's Oakport Wet Weather Treatment Plant_ <br />BASIS OF EVALUATION <br />Cost of facilities is based on conveying a maximum flow of 12 mgd to EBMUD, with flows <br />in excess of 12 mgd being stored at the City treatment plant and then conveyed to EBMUD <br />when incoming flow drops below 12 mgd. Flow will be conveyed by forcemain to ESMUD's <br />61-inch South Interceptor located east of Highway 880 near Coliseum Way. <br />Flow records were reviewed to determine the amount of storage required to reduce the peak <br />flow to EBMUD. City operating staff indicated that recent flow metering data may be low due <br />to metering equipment problems. Review of flow data for February 20, 1994, November 6, <br />1994, January 10, 1995, and January 27, 1995 indicated that flow could be attenuated to <br />12 mgd with less than 1 million gallons of storage. Because of the uncertainty of metered <br />flows, a minimum on -site storage of 2 million gallons was assumed as referenced in the HDR <br />report. <br />EXISTING PUMPING STATION <br />The existing treatment plant influent pumping station has eight pumps with a combined <br />capacity of approximately 26 mgd. Four pumps discharge to a 30-inch header and four to a <br />24-inch header. The two headers merge and flow to Distribution Box No. 3 <br />165 Lennon lane, Suite '05 ■ WaInU,- Creek. CA 94598 IN (510) 937-3440 a FAY: (510) 937-3450 <br />137 <br />