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SEP-28-98 MON 10:12 AM SAN LEANDRO PUBLIC WORKS FAX NO. 5103521192 P.15 <br />Mr. Robert D. Taylor <br />City of San Leandro <br />September 25, 1995 <br />Page 2 <br />The west side pumps discharging to the 30-inch header will be replaced with three 6 mgd, <br />150 horsepower variable speed pumps. The 30-inch header will be separated from the 24-inch <br />header and connected to the 24-inch export pipeline. The two 1,000 gpm (1.4-4 rngd) east <br />side pumps will be replaced with 2,000 gpm (2.9 mgd) 20 horsepower pumps. The four east <br />side pumps will have a capacity of approximately 10 mgd and will pump excess flow to <br />storage via Distribution Box No. 3. The export_ pump and pipeline system will have a surge <br />control system and metering station. <br />EQUALIZATION STORAGE <br />Available on -site storage includes the following process units: <br />Process Unit <br />Primary Settling Tanks <br />Primary Clarifier No. 1 <br />Primary Clarifier No. 2 <br />Aeration Tanks <br />Secondary Clarifier No. 3 <br />Secondary Clarifier No. 4 <br />Chlorine Contact Tank <br />TOTAL <br />Volume, Gallons <br />315,500 <br />249,000 <br />305,000 <br />1,319,400 <br />605,500 <br />476,900 <br />195,000 <br />3,466,300 <br />These process units are all connected by piping and pumping systems and can be filled <br />through Distribution Box No. 3. A high pressure washdown water system and washdown <br />monitors will be provided for ease of cleanup after the equalizing storage is used. The system <br />should be designed to utilize the entire 3,466,300 gallons of available storage. <br />FORCEMAIN ROUTE <br />The forcemain route is approximately 14,000 feet in length, as shown on Figure 1. The <br />forcemain will be 24-inch and leave the plant eastward along an existing alley where an <br />easement may be required. The forcemain will continue north along Doolittle Drive to Airport <br />Way, then northeasterly along Hegenberger to Oakport Street. The forcemain will be jacked <br />under Highway 880 and connect to the existing EBMUD 51-inch South Interceptor near <br />Coliseum Way. The forcemain will be constructed of mortar -lined, tape -wrapped, steel pipe <br />with cathodic protection. The proposed route is along existing streets which are adequate in <br />width to accommodate pipeline construction. No investigation was made of existing utilities <br />or permits required to construct along the proposed route. <br />13A8 <br />