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Water Boards <br />9'4:a+i\ <br />GAVIN NEWSOM <br />GOVERNOR <br />F}� <br />.JARED BLUMENFELD <br />SECRETARY FOR <br />ENVIRONMENTAL PROTECTION <br />Central Valley Regional Water Quality Control Board <br />19 M ay 2022 <br />Ray Farmer and Bess Farmer Community Property Trust <br />c/o Linda Wilson <br />5232 Quashnick Road <br />Stockton, CA 95212 <br />RESPONSE TO ASSESSMENT WORK PLAN, TOYOTA TOWN INC. • <br />610 NORTH HUNTER STREET STOCKTON, SAN JOAQUIN COUNTY, <br />LUST CASE #390213, GEOTRACKER GLOBAL ID #T0607700148 <br />Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff <br />reviewed the following documents: <br />• Work Plan for Additional Off -Site Groundwater Delineation and On -Site Soil <br />Vapor Sampling (Work Plan), dated 18 April 2022 <br />• First Quarter 2022 Monitoring Report (Groundwater Report), dated 20 April 2022. <br />ATC Group Services Inc. (ATC) submitted these documents on your behalf for the <br />Toyota Town Inc. (Toyota Town) petroleum release case at 610 North Hunter Street in <br />Stockton (Site). In the Groundwater Report, ATC presents the results of March 2022 <br />groundwater sampling activities at the Site, which are summarized in Table 1 below. In <br />the Work Plan, ATC proposes an off -Site boring northeast of well MW -12 to delineate <br />the extent of the Site plume. ATC also proposes to install two temporary soil gas wells <br />beneath the remaining concrete foundation slab of the former Site structure to assess <br />the vapor intrusion risk to the intended future residential development of the Site. <br />Table 1 —March 2022 Maximum Groundwater Concentrations <br />Zone <br />Screened <br />Interval <br />Last <br />Sam led <br />TPHg <br />B <br />T <br />E <br />X <br />MTBE <br />TBA <br />1,2 <br />DCA <br />Shallow <br />2545 <br />1 Q22 <br />25900 <br /><0.5 <br /><0.5 <br />3.1 <br />2.7 <br /><0.5 <br /><10 <br /><0.5 <br />Inter- <br />mediate <br />40-60 <br />1 Q22 <br /><50 <br /><0.5 <br /><0.5 <br /><0.5 <br /><1 <br /><0.5 <br /><10 <br /><0.5 <br />Deep <br />60-65 <br />1 Q22 <br />31100 <br />360 <br /><5 <br />2.1 <br /><10 <br />0.93 <br /><100 <br /><5 <br />Water Quality Objectives <br />50 <br />1.0 <br />150 <br />300 <br />1,750 <br />13 <br />12 <br />0.5 <br />TPHg= total petroleum hydrocarbons as gasoline; BTEX= benzene, toluene, ethylbenzene, <br />total xylenes; MTBE= methyl tent butyl ether; TBA= tert butyl ether; 1,2 -DCA= 1,2- <br />dichloroethane <br />MARK BRADFORD, CHAIR I PATRICK PULUPA, ESQ., EXECUTIVE OFFICER <br />11020 Sun Center Drive #200, Rancho Cordova, CA 95670 � www.waterboards.ca.gov/centralvalley <br />