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En..He G. an."Jn. <br /> MA HewRICUEZ <br /> e.i no..Ru eao.ecno. <br /> Water Boards <br /> Central valley Regional Water Quality Control Board <br /> Oft ee- <br /> 21 August 2018 KtCE/VIEAUG 3 2Ui8 u <br /> D <br /> Natasha Molla Chevron EMC ENV/RU <br /> 145 S. <br /> CA 92821 College Blvd #500 PERM�SERLtF�TH <br /> CHEVRON STATION #94054, 2103 COUNTRY CLUB BOULEVARD, STOCKTON, SAN <br /> JOAQUIN COUNTY, CASE# 390089 <br /> Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff reviewed the <br /> Site Assessment Work Plan (Work Plan) dated 7 August 2018, submitted on your behalf by GHD <br /> Inc. (GHD) for the Former Chevron Station#94054 unauthorized petroleum release at 2103 Country <br /> Club Boulevard in Stockton (Site). In the Work Plan, GHD proposes to advance two shallow soil <br /> borings (B9, B10) near the north and south ends of the former waste oil tank (WOT), as follows: <br /> Borings Total Depth Soil Sam lin <br /> Depth Analysis <br /> (ft b s (ft bgs) <br /> 4, 8 Naphthalene, PAHs <br /> B9, B10 12 12 TPHd (SGC), TOG, VOCs, <br /> SVOCs, PCBs, Title 22 metals <br /> PAHs=polycyclic aromatic hydrocarbons;TPHg(SGC)=total petroleum hydrocarbons with Silica Gel <br /> Cleanup;TOG=total oil and grease;VOCs=volatile organic compounds;SVOC=semi-VOCs; <br /> PCB=polychlorinated biphenyls;ft bgs=feet below ground surface <br /> Previous WOT soil samples were collected below the former tank at 11 feet below ground surface <br /> (bgs), and were analyzed only for total petroleum hydrocarbons as gasoline (TPHg), TPH as diesel <br /> (TPHd), benzene, toluene, ethylbenzene, xylenes (BTEX), lead, cadmium, chromium, and zinc. The <br /> proposed scope of work addresses soil data gaps between 0 to 5 and 5 to 10 feet below ground <br /> surface (bgs)for comparison to the Low Threat Underground Storage Tank Case Closure Policy <br /> (LTCP), and gaps related to the nature of the release. As such, Central Valley Water Board staff <br /> — ---concurs with the scope of work as proposed in the Work Plan, with the following conditions: <br /> 1. Please ensure that the borings are advanced just outside the former WOT excavation area, <br /> and that soil samples are collected from native material. <br /> 2. By 23 November 2018, please submit an Assessment Report which details the completion <br /> of the proposed work and the resultant findings. Please also include an evaluation of the <br /> data in relation to the nature of the release, as well as in relation to the LTCP. If based on <br /> the data, you believe this case to be ready for closure, please include a full evaluation of Site <br /> conditions and data as compared to the LTCP, which provides discussion of how each <br /> General and Media-Specific criterion is met, and identifies any remaining data gaps. Please <br /> also include recommendations to address any identified gaps, and include all historical <br /> groundwater, soil, soil gas, and remedial data in tabular form. <br /> KARL E LONOLEY SCD, P.E.,CHAIR I PATRICK PULUPA,950.,MCUTIVE OFFICER <br /> 11020 sun Center on.9200.Ra1100g Cordova,CA 95670 I www.weterboards.ce.gov/centrelvalley <br /> C' ne . LeP 1A11. <br />