Laserfiche WebLink
OMUND G.BROWN JR. <br /> MCRETAR RODR,a VEz <br /> IOR <br /> Water Boards WRD.HEN.A,WOTMnDN <br /> Central Valley Regional Water Quality Control Board RECEIVED <br /> 7 May 2014 MAY 12 2014 <br /> ENVIRONMENTAL HEAM <br /> Joseph Reyes PERMITISERVICES <br /> Public Works Director <br /> City of Lathrop Department of Public Works <br /> 390 Towne Center Drive <br /> Lathrop, CA 95330 <br /> CONDITIONAL APPROVAL OF TEMPORARY DISCHARGE OF WASTEWATER FROM <br /> WASTEWATER RECYCLING PLANT(WRP-1) TO CROSSROADS WWTF, <br /> SAN JOAQUIN COUNTY <br /> The City of Lathrop owns and operates Wastewater Recycling Plant (WRP-1) and the <br /> Crossroads Wastewater Treatment Facility in San Joaquin County. Both facilities are <br /> located adjacent to each other. WRP-1 treats and disposes of domestic wastewater, and is <br /> regulated by Waste Discharge Requirements (WDRs) R5-2006-0094. The Crossroad <br /> facility treats and disposes of industrial and domestic wastewater, and is regulated by <br /> WDRs Order 5-01-251. <br /> The City of Lathrop is currently in the process of expanding the WRP-1 facility. As part of <br /> the expansion project the City must replace the facility's membrane bioreactor filters. <br /> Replacement of the filters is anticipated to take 30 days. During this time the treatment <br /> capacity of the plant will be reduced by approximately 0.1 million gallons per day (mgd). <br /> The City has requested that 0.1 mgd of raw sewage be diverted from WRP-1 to the <br /> Crossroads WWTF for 30 days during the summer of 2014, while the filters are being <br /> replaced. Alternatively, the City could divert the raw sewage to an emergency storage <br /> basin at WRP-1. However, this option is not preferred as the storage basin is unlined and <br /> does not provide any mechanical treatment of waste. <br /> The Crossroads WWTF is designed to treat and dispose of .25 mgd. Currently, the facility <br /> is treating and disposing of approximately .15 mgd. Therefore, the WWTF should have <br /> adequate capacity to treat and dispose of the additional 0.1 mgd of wastewater. <br /> The table below shows wastewater quality for both facilities reported from June through <br /> September 2013. <br /> Facility Influent BOD I Effluent BOD Effluent TDS <br /> WRP-1 250-400 m9/1 1 <2.0-2.2 m /I 680-730 m /I <br /> Crossroads WWTF 150-300 mg/1 2.0-3.3 m /I 1,000-1,200 m /I <br /> KARL E. LONGLEV Sc D, P.E., CHAIR I PAMELA C. CREEOON P.E., BCEE, E%ECUTIVE OFFICER <br /> 11020 Sun Center Drive 4200,Rancho Cordova,CA 95670 1WwH'.weterboarCs.ca.gov/centralvalley <br /> ('j RFcvcieD nnreR <br />