Laserfiche WebLink
4 CalifornVegional Water Quality C(*ol Board _ <br /> E Central Valley Region .: I <br /> Karl E. Longley,ScD, P.E.,Chair <br /> Linda S.Adams Arnold <br /> Secrerai �.or Sacramento Main Office <br /> f 11020 Sun Center Drive#200.Rancho Cordova.California 95670-6114 Schwarzenegger <br /> Environmental <br /> Phone(916)464-3291 FAX(916)464-4645 6O1C1701 <br /> Protechon <br /> httpWwww.waterboards ca.gov/centralvalley <br /> 6 June 2007 ac)j <br /> CERTIFIED MAIL ✓(y O <br /> 7006 0810 0002 9651 4177 F/VV/RO � 7200? <br /> N <br /> Mr. Donald RodgersR��q��y <br /> 11900 South Union Rd. <br /> FS <br /> Manteca, CA 95336 <br /> CHANGE OF LEAD AGENCY, FILE REVIEW, AND REQUEST FOR WORK PLAN, <br /> THE TRANSMISSION STORE, 515 WEST CHARTER WAY, STOCKTON, <br /> SAN JOAQUIN COUNTY (REGIONAL BOARD CASE # 390891) <br /> In a letter dated 24 May 2007, the San Joaquin County Environmental Health Department <br /> (SJCEHD) transferred the regulatory agency lead to the Regional Board for the cleanup of <br /> petroleum hydrocarbons at The Transmission Store, 515 Charter Way, Stockton (Site, <br /> Figure 1). Attached is a site chronology prepared by SJCEHD. Please address all future <br /> correspondence to the address in the header of this letter, and continue to send copies of <br /> written correspondence to SJCEHD. <br /> On 7 February 1996, one 550-gallon gasoline Underground Storage Tank (UST) was removed <br /> from the Site (Figure 2). Maximum soil confirmation concentrations were: toluene (T), <br /> 2.9 milligrams per kilogram (mg/kg); ethylbenzene (E), 2.6 mg/kg; xylenes (X), 13 mg/kg; <br /> Kerosene, 690 mg/kg; and Motor Oil, 7,600 mg/kg. Figure 2 also shows locations for a second <br /> gasoline UST and a third waste oil UST, presumably removed during the 1950's. <br /> In September and October of 1996, your consultant EMCON/OWT advanced six soil borings, <br /> and analyzed soil and grab groundwater samples. One boring was converted to a shallow <br /> groundwater monitoring well (MW-1 R) and four borings were converted to soil vapor extraction <br /> wells VW-11D, VW-2D, VW-3D and VW-4. Maximum groundwater concentrations were: Total <br /> Petroleum Hydrocarbons as gasoline (TPHg), 33,000 micrograms per Liter (Ng/L); benzene, <br /> 1 ,400 dig/L; and Methyl tert-Butyl Ether (MtBE), 550 pg/L. <br /> In March and April of 2003, four monitoring wells MW-2R, MW-3R, MW-4R(S) and MW-4R(D) <br /> were installed. MW-4R(D) was completed as a deep (80 feet below ground surface, or feet <br /> bgs) well. Maximum groundwater results were: TPHg, 62,000 ug/L and benzene <br /> 7,300 ug/L. Quarterly groundwater monitoring continued until October 2006. Depth to water <br /> varied from 17 to 24 feet bgs. Groundwater flow direction varied from east to north. <br /> California Environmental Protection Agency <br /> ��Recpcled Paper <br />