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California Regional Water Quality L introl Board <br /> Central Valley Region <br /> Steven T.Butler,Chair r; <br /> Sacramento Main office <br /> Kinston H.ttickox Gray Davis <br /> Internet Address: hnpJMww.swrcb.ca.gov/ c � n <br /> Secretary for 3.tiJ Routier Road,Suite A.Sacratttmtu,CaliOxn <br /> ' 400 PM 12: 48 Governor <br /> En,wonmemal Phone(916)255.3000•FAX(916)255-3015 <br /> Protection <br /> 7 June 2000 <br /> Mr. Kul Sharma <br /> City Engineer <br /> City of Tracy <br /> 520 Tracy Blvd. <br /> Tracy, CA 95376 <br /> STATEMENT OF POLICY, WASTEWATER TREATMENT STORAGE POND, TRACY HILLS <br /> SUBDIVISION WEST SIDE GROUP, TRACY, SAN JOAQUIN COUNTY <br /> This letter provides information on storage of domestic wastewater in ponds and was prepared in <br /> response to a request by Ms. Colleen Haerr of Thompson-Hysell Engineers, representing the Tracy Hills <br /> Subdivision West Side Group. To date,the Regional Water Board has not received a Report of Waste <br /> Discharge for the discharge discussed below. <br /> It is our understanding, that for conceptual planning purposes, the West Side Group is investigating the <br /> requirements for storing wastewater during the wet season at a location different than the proposed <br /> wastewater treatment plant. Because the West Side Group has not provided information regarding <br /> public contact of the wastewater I am unable to advise them on the level of treatment which would be <br /> required. Consistent with the California Code of Regulations, Title 22, Chapter 3, greater levels of <br /> public contact require increased levels of treatment and disinfection. <br /> As described by Ms. Haerr, the stored wastewater will be applied to cropland when climatic and crop <br /> conditions allow. Storing wastewater for the use described by Ms. Haerr will likely be considered a <br /> "landscape impoundment." However, because information on the existing groundwater quality and final <br /> use of the wastewater has not yet been provided, treatment standards can not be established. We are <br /> unclear as to why the West Side Group wishes to store wastewater at a location different than the <br /> WWTP. The RWD will need to explain why this is necessary. <br /> Ms. Haerr stated that it is proposed that the ponds not be lined with low permeability materials. This <br /> may be acceptable depending on the existing groundwater quality, proximity of groundwater users (i.e. <br /> wells), and wastewater quality. The RWD will need to show that the proposed method of storage will <br /> not degrade groundwater quality. Ms. Haerr has stated the wastewater would be denitrified prior to <br /> storage; other contaminants such as dissolved solids in wastewater would also need to be evaluated to <br /> determine their potential impact on groundwater quality. <br /> Prior to discharge of wastewater to a storage pond or land surface, Waste Discharge Requirements are <br /> required. The time schedule for obtaining Waste Discharge Requirements is approximately 120-days <br /> California Environmental Protection Agency <br /> Qr1 Regrled Paper <br />