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3" Enmuxc G.BROWN JR. NOR _5 eAuroexlA `- MATTHEW ROD IaUennon Water Boards `./ `x "ID" DO." Valley Regional Water Quality Control Board 10 February 2017 Ms. Sharon Evans Phillips 66 Company 1380 San Pablo Avenue Rodeo, CA 94572 Semi-Annual Groundwater Monitoring Status Report Fourth Quarter 2015, 76 Service Station No. 11190, 1206 East March Lane, Stockton, San Joaquin County California Regional Water Quality Control Board, Central Valley Region (Central Valley Water Board) staff reviewed the Groundwater Delineation Workplan (Work Plan) dated 13 December 2016, submitted on your behalf by ATC Group Services, LLC (ATC). The 76 Service Station No. 11190 is located at 1206 East March Lane in Stockton (Site). In the Work Plan, ATC proposed to advance one soil boring for collection of soil samples in the immediate vicinity of the former oil-water separator, and to install four shallow wells and three deep wells to complete lateral and vertical delineation of petroleum impacts in groundwater. The soil boring is proposed to be advanced to a total depth of 20 feet below ground surface (ft bgs), and ATC proposed to collect soil samples for lithologic description every five feet. ATC proposed to submit two soil samples for laboratory analysis for: total petroleum hydrocarbons (TPH) as oil and grease (TPH-OG), TPH as diesel (TPH-D), TPH as gasoline (TPH-G), volatile organic compounds (VOCs), semi-volatile organic compounds (SVOCs), polynuclear aromatic hydrocarbons (PAHs), polychlorinated biphenols (PCBs). The four shallow monitoring wells are proposed to be screened from 50 to 65 ft bgs, and the three deep monitoring wells are proposed to be screened from 75 to 80 ft bgs. Soil samples are proposed to be collected at 5-foot intervals for lithologic logging, and at least two (2) soil samples from each well boring will be retained for laboratory analysis. ATC proposed to analyze soil samples for: TPH-G, TPH-D, benzene, toluene, ethylbenzene, total xylenes (BTEX), and fuel oxygenates. Central Valley Water Board staff concur with the scope of work presented in the Work Plan, provided the following comments are addressed. Therefore, by 31 May 2017, submit a Well Installation Report presenting results of this phase of the investigation. 1. Please assure that the two soil samples submitted for laboratory analysis from the oil- water separator soil boring are collected from native soil and are not backfill material. KARL E. LONGLEY ScD, P.E.,CHAIR I PAMELA C. CNEEDON P.E., BCEE,EXECUTIVE OFFICER 11020 Sun Center DrIVe#200,RanabO Cordova,CA 95690 1 www.weterboerde.0a.90V/eentralvelley �O necveLeo Rnnn ..'.