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EouueoG. Bnowry JR. <br /> Qp a ..o" <br /> M—"*,Rowu�ecrwx <br /> Water Boards <br /> Central Valley Regional Water Quality Control Board RF <br /> 15 August 2018 CF�V,�D <br /> AUG 202018 <br /> Mr. Donald11900 SouthU ionsRd. ENP RM "RFSCTy <br /> Manteca, CA 95339 <br /> THE TRANSMISSION STORE, 515 W. CHARTER WAY, STOCKTON, SAN JOAQUIN COUNTY, <br /> RB CASE #390891 <br /> Central Valley Regional Wafer Quality Control Board (Central Valley Water Board)staff reviewed <br /> the Site Assessment Work Plan—August 2016 (Work Plan) dated 1 August 2018, submitted on <br /> your behalf by Advanced GeoEnviron mental Inc (AGE) for the Transmission Store unauthorized <br /> petroleum release at 515 W. Charter Way in Stockton (Site). <br /> In the Work Plan, AGE proposes to advance a single hand-auger boring in between the two former <br /> underground storage tanks (USTs), as follows: <br /> Boring Total Depth Soil Sampling Depth Analysis <br /> (ft b s (ft b s <br /> B1 10 5, 10 TPHg, BTEX, MTBE, TBA, DIPE, ETBE, <br /> TAME, EDB, 1,2-DCA, na hthalene, PAHs <br /> TPHg=total petroleum hydrocarbons as gasoline;BTEX=benzene,toluene,ethylbenzene,xylenes; MTBE=methyl tert butyl ether; <br /> TBA=tert butyl alcohol; DIPE=di-ispropyl ether; ETBE=ethyl tert butyl ether;TAME=tert amyl methyl ether; EDB=ethylene dibromide, <br /> 1,2-DCA=1,2-dichloroethylene;PAH=polycyclic aromatic hydrocarbons <br /> Boring B2R was advanced at the southern end of the 550-gallon underground storage tank (UST) <br /> of unknown contents removed in 1996. Soil samples collected at 10.5 and 25.5 feet below ground <br /> surface (bgs) from B2R were below reporting limits for volatile organic compounds (VOCs), <br /> chlorinated hydrocarbons, and polychlorinated biphenyls (PCBs). The proposed boring appears to <br /> address remaining soil data gaps at the Site. As such, Central Valley Water Board staff concurs <br /> with the scope of work as proposed in the Work Plan. <br /> By 9 November 2018, please submit an Assessment Report detailing the completion of the <br /> proposed scope of work and the resultant findings. <br /> If you have any questions or concerns regarding comments in this letter please contact the <br /> undersigned of(916) 464-4615 or by email at alan.buehler(awaterboards.ca.gov. <br /> GPI �GOAlan M. Buehler, P.G. 0Engineering Geologist �FR ~CC list on next page. �PKARL E. LONGLPATRICK PULUPA, ESO., EXECUTIVE OFFICER <br /> 11020 Sun Center Dme#200.Rancho Cordova,CA 85570 1 www.wateNoards.ca.gov/contralvalley <br /> ('j h.c .Ltc rAnaR <br />