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g G. BROWN Jn. <br />MATTNEW ROORIOLIE2 <br />fiN=PITEPrT71. PROTECT ION Water Boards <br />Central Valley Regional Water Quality Control Board <br />10 August 2017 <br />Linda Wilson <br />2606 Sheridan Way <br />Stockton, CA 95207 <br />TOYOTA TOWN INC., 610 NORTH HUNTER STREET, STOCKTON, SAN JOAQUIN COUNTY, <br />CASE# 390213 <br />Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff reviewed <br />the Work Plan for Additional Groundwater Delineation (Work Plan) dated <br />4 August 2017, submitted on your behalf by ATC Group Services Inc. (ATC) for the Toyota Town <br />property at 610 North Hunter Street in Stockton (Site). In the Work Plan, ATC proposes to <br />advance three (3) hydropunch borings as follows: <br />Borings Total Depth <br />(ft bgs) <br />Groundwater Sampling <br />Depth <br />(ft bgs) <br />Analysis <br />HP-7 thru HP-9 65 45, 65 TPHg, BTEX, MTBE, TBA, other Fuel Oxygenates <br />TPHg=total petroleum hydrocarbons as gasoline; BTEX=benzene, toluene, ethylbenzene, xylenes; <br />ft bgs=feet below ground surface <br />In the 10 May 2017 Subsurface Investigation Report, ATC indicates that they do not believe the <br />petroleum hydrocarbons detected in borings HP-5 and HP-6 at 65 feet bgs came from the Site <br />underground storage tank (UST). The proposed borings will provide additional delineation of the <br />extent of hydrocarbon impact to groundwater from the Toyota Town Site as well as provide <br />additional data related to the potential source of the deep groundwater impact in the northern <br />portion of the Site. <br />Central Valley Water Board staff concurs with the scope of work proposed in the Work Plan. By <br />10 November 2017, please submit a Groundwater Assessment Report. Based on groundwater <br />analytical data, please include conclusions and recommendations related to the source of the <br />hydrocarbons reported in deep groundwater in the northern portion of the Site. <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.buehler@waterboards.ca.gov. <br />sS101‘144 <br />Alan M. Buehler, P.G. <br />Engineering Geologist <br />, 17D0°- I <br />cc: Sriram lyer, State Water Resources Control Bo. : - : Cleanup Fund, Sacramento <br />Michael Keith, San Joaquin County Environmental Health Department, Stockton <br />Jeanne Homsey, ATC Group Services LLC, Modesto <br />KARL E. LONGLEY ScD, P.E., CHAIRI PAMELA C. CREEDON P.E., BCEE, EXECUTIVE OFFICER <br />11020 Sun Center Drive #200, Rancho Cordova, CA 95670 I www.waterboards.ca.govicentralvalley <br />CI RECYCLED PAPER