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sSI 0 1\ bi4 <br />Alan M. Buehler, P.G. <br />Engineering Geologist <br />CC list on next page. <br />KARL E LONGLEY ScD, P. <br />AL IF004\‘'' <br />PA1RICK PULUPA, EGO., EXECUTIVE OFFICER <br />8/10... Jo. <br />cilk6; MATiriEV: RODRIQuE2. <br />4 MI"R=0.17:i. POOTECtiDr. Water Boards <br />Central Valley Regional Water Quality Control Board <br />15 August 2018 <br />Mr. Donald Rodgers <br />11900 South Union Rd. <br />Manteca, CA 95339 <br />THE TRANSMISSION STORE, 515 W. CHARTER WAY, STOCKTON, SAN JOAQUIN COUNTY, <br />RB CASE #390891 <br />Central Valley Regional Water 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 GeoEnvironmental Inc (AGE) for the Transmission Store unauthorized <br />petroleum release at 515W, 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 <br />(ft bgs) <br />Soil Sampling Depth <br />(ft bgs) <br />Analysis <br />B1 10 5, 10 TPHg, BTEX, MTBE, TBA, DIPE, ETBE, <br />TAME, EDB, 1,2-DCA, naphthalene, PAHs <br />--• • • • " ' l-ThIgtotaI petroleum hydrocarbons as gasoline: BlEXbenzerte, toluene, ethylbenzene, xylenes; MTBE=methyl tert butyl ether; <br />TBA=tert butyl alcohol; DIPE=di-ispropyl ether; ETBE=ethyl tel 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 at (916) 464-4615 or by email at alan.buehlerAwaterboards.ca.qov. <br />11020 Sun Center Drive 1200, Rancho Cordova, CA 95670 I www.vralerboards.ca .govicentralvalley <br />CO RECYCLED PAYE.