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10:0100 <br />Water Boards <br />EICITUIED G. 13flow11 Js. <br />OCIPF/IROR <br />MATTHEW Ro0RIOUF2 <br />:HVIII0r4I‘Dr.rE*IfT°P.7 PROTECTION <br />Central Valley Regional Water Quality Control Board <br />21 March 2018 <br />Linda Wilson <br />2606 Sheridan Way <br />Stockton, CA 95207 <br />WORK PLAN RESPONSE, TOYOTA TOWN INC., 610 N. HUNTER STREET, STOCKTON, SAN <br />JOAQUIN COUNTY, CASE# 390213 <br />Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff reviewed the <br />Work Plan for Additional Off-Site Groundwater Delineation (Work Plan) dated 7 March 2018, submitted <br />on your behalf by ATC Group Services LLC (ATC) for the Toyota Town petroleum release at 610 N. <br />Hunter Street in Stockton (Site). <br />In order to further delineate the current extent of petroleum impact to groundwater downgradient of the <br />Site, in the Work Plan ATC proposes to advance two additional borings downgradient of CPT-3, as <br />detailed in the table below. <br />Boring Location Total Depth <br />(ft bgs) <br />Grab Groundwater Sampling <br />Depth <br />(ft bgs) <br />Analysis <br />Near 1999 Boring SB10 65 45, 65 TPHg, BTEX, MTBE, TBA Near 2001 Boring SB16 <br />TPHg=total petroleum hydrocarbons as gasoline; BTEX=benzene, toluene, ethylbenzene, and xylenes; MTBE=methyl tert butyl ether; <br />TBA=tert butyl alcohol; ft bgs=feet below ground surface <br />Central Valley Water Board staff concurs with the scope of work as proposed in the Work Plan. By <br />29 June 2018, please submit an Assessment Report, which details the boring activities and the <br />resultant findings. <br />If you have any questions or concerns regarding comments in this letter please contact the undersigned <br />at (916) 464-4615 or by email at alan.buehler(&waterboards.ca.qov. <br />HJA - <br />Alan M. Buehler, P.G. <br />Engineering Geologist <br />cc: Sriram lyer, State Water Resources Control Board, UST Cleanup Fund, Sacramento <br />Michael Kith, San Joaquin County Environmental Health Department, Stockton <br />Jeanne Homsey, ATC Group Services LLC, Modesto <br />KARL E. LONGLEY ScD, P.E., CHAIR I PAMELA C. CREEOON P.E., BCEE, EXECUTIVE OFFICER <br />11020 Sun Center Drive 41200, Rancho Cordova, CA 95670 I www.waterboards.ca.govicentralvalley <br />CO RECYCLED PAPER