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California Re ionaI Wat6r Quality �ontrol Board Central Valley Region : Robert Schneider,Chair Terry Tamminen Arnold Schwartenegger Secretaryfor Sacramento Main Office Governor Environmental Protection Internet Address: http://www.swrcb.ca.gov/—rwgcb5 11020 Sun Center Drive,#200,Rancho Cordova,CA 95670-6114 D Phone(916)464-3291 •FAX(916)464-4780 REIT E 11/j IED - 26 January 2004 JAN 2 71/21004 ENVIRONMENT HEALTH Cary Keaten PERMIT/SERVICES City of Lathrop 16775 Howland Road Lathrop, CA 95330 INCOMPLETE DRAFT REPORT OF WASTE DISCHARGE, CITY OF LATHROP WATER RECYCLING PLANT,LATHROP, SAN JOAQUIN COUNTY I have reviewed the Draft Report of Waste Discharge(RWD) submitted on 12 November 2004 for the Phase I Membrane Bioreactor(MBR) wastewater treatment system at the City of Lathrop and have determined additional information is required. This letter requests submittal of the Final RWD. The Final RWD must fully describe the proposed wastewater system, address all items listed herein, address all comments by the California Department of Health Services (DHS), and must be prepared under the supervision of a California licensed Registered Engineer. The following significant items were noted in the report: • The November 2003 RWD is not signed or stamped by a California licensed engineer. All future submittals must contain a certification page or the report will not be reviewed until the certification is received. • The background section of the RWD states the City is interested in discussing combining the permit for the existing Crossroads secondary plant with the permit for the proposed MBR plant. Portions of the RWD also refer to upgrades of the existing Crossroads plant to tertiary standards. However, staff understands the current RWD under consideration only addresses the MBR 0.75 million gallons per day treatment system. Statements regarding future expansion phases generally were not evaluated nor commented on in this review. Staff understands that the two plants will be operated separately, and therefore will maintain separate permits. • In our meeting on 13 December 2002, staff requested information on other MBR systems that have been constructed and are operational at other wastewater treatment plants. Specifically, we are interested in the actual reliability of the systems. Please provide information on other MBR systems describing: length of time system in operation, flow rate, treatment system up and down time, unanticipated problems, scheduled maintenance, treatment system effectiveness in reducing contaminants, raw wastewater quality, treated wastewater quality, and replacement parts availability. Are some parts available only through one or a limited number of vendors? If the vendors go out of business, will the parts be available? California Environmental Protection Agency Co Recycled Paper The energy challenge facing California is real. Every Californian needs to take immediate action to reduce energy consumption. For a list of simple ways you can reduce demand and cut your energy costs,see our Web-site at http://www.swrcb.ca.gov/mgcb5