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Califorr, - Regional Water Quality C(*ol Board -;b, <br /> Central Valley Region <br /> Karl E. Longley,ScD,P.E.,Chair <br /> Linda Adams 11020 Sun Center Drive#200,Rancho Cordova,California 95670-6114 Arnold <br /> Secrelary for Phone(916)464-3291 •FAX(916)464-4645 Schwarzenegger <br /> Environmental hitp://www.walerboards.ca.gov/cenlralvalley Governor <br /> Prmeetion <br /> 13 May 2009 <br /> Stephen Salvatore <br /> City of Lathrop "Al 16 2009 <br /> 390 Towne Centre Drive ENVIRONM <br /> Lathrop, CA 95330 PERMIT/SERA E3Til <br /> DISPOSAL OF GROUNDWATER FROM DEWATERING ACTIVITIES, CITY OF LATHROP, <br /> SAN JOAQUIN COUNTY <br /> We have reviewed the 28 January 2009 Temporary Use of Pond S6 for Dewatering Water <br /> Storage letter prepared by the City of Lathrop and determined the disposal procedures <br /> described in Option 5 are acceptable, as described below: <br /> • All requirements of Waste Discharge Requirements (WDRs) Order No. R5-2006-0094 <br /> remain in effect. Note that WDR Provision G.12 addresses inflow of relatively <br /> contaminant free water related to compliance with the Order. Please operate the storage <br /> and disposal of dewatered groundwater in compliance with the existing WDRs. Provision <br /> G.12 states: <br /> The Discharger shall not allow pollutant-free wastewater to be discharged into the <br /> wastewater collection, treatment, and disposal system in amounts that significantly <br /> diminish the system's capability to comply with this Order. Pollutant-free wastewater <br /> means rainfall, groundwater, cooling waters, and condensates that are essentially free <br /> of pollutants. <br /> • Pond S6 is used for storage of recycled water (downstream of the treatment system) prior <br /> to land application of the water. Pond S6 is described in the WDRs. <br /> • During the months when groundwater dewatering is occurring, or disposal of the <br /> groundwater is occurring, please add a comment to the monthly monitoring report <br /> describing the status of the project, the storage pond, and the application areas used to <br /> dispose of the water. <br /> If you have any questions on this information, please contact me at (916) 464-4732. <br /> i " <br /> e"L/Z'�, j C. 'G Ly <br /> MARY SE RA, P.E., Chief <br /> Waste Discharge to Land Unit <br /> cc: Rodney Estrada, San Joaquin County Environmental Health Department, Stockton <br /> Lynn Forcum, California Natural Product, Lathrop <br /> California Environmental Protection Agency <br /> pia Recycled Paper <br />