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s la <br /> EONSUNo G. BROWII JR. <br /> GOVERNOR <br /> rr.Yi t�,J <br /> C A L I I O R N I A SE RODRIOUEZ <br /> CRETARY R Water Boards ENVIRONMENTAL PROTECTIOI: <br /> Central Valley Regional Water Quality Control Board <br /> 30 June 2017 <br /> Sharon Evans Chris Panaitescu <br /> Phillips 66 Company Thrifty Oil Company <br /> 1380 San Pablo Avenue 13116 Imperial Highway <br /> Rodeo, CA 94572 Santa Fe Springs, CA 90670 <br /> BP #172 (THRIFTY), 7647 PACIFIC AVENUE, STOCKTON, SAN JOAQUIN COUNTY, <br /> CASE# 390652 <br /> Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff <br /> reviewed the Remedial Action Plan (RAP) dated 14 June 2017, submitted on your behalf by <br /> ATC Group Services LLC (ATC), for the BP #172 property located at 7647 Pacific Avenue in <br /> Stockton (Site). <br /> In 1995, Alton Geosciences performed a soil vapor extraction (SVE) pilot test, and in 1999 Park <br /> Corporation performed a 12-hour groundwater extraction (GWE) pilot test at the Site. These <br /> pilot tests indicated that both SVE and GWE could effectively remove petroleum hydrocarbons <br /> from the Site. In 2001, GeoHydrologic Consultants (GeoHydrologic) installed and started a dual <br /> phase extraction (DPE) system, consisting of both SVE and GWE. As of March 2009, the DPE <br /> system had removed a total of 210,156 pounds of vapor-phase hydrocarbons and 582,804 <br /> gallons of petroleum impacted groundwater. In March 2009,GeoHydrologic shut down the DPE <br /> system to conduct repairs, and the DPE system ultimately remained off. <br /> In 2010 Stantec Consulting Corporation (Stantec) removed the DPE system and cut associated <br /> piping to allow for Site redevelopment. Currently, the Site has no remedial system installed or in <br /> operation. In 2014, ATC performed an SVE and air-sparge (AS) pilot test, which indicated that <br /> in conjunction with AS, SVE remains a viable remedial option at the Site. <br /> In the RAP, ATC proposes SVE/AS remediation to remove petroleum hydrocarbons in three (3) <br /> areas: 1) the vicinity of MW-13 and MW-14, 2) the vicinity of MW-22, and 3) the vicinity of MW-3 <br /> and MW-15. ATC proposes to use existing SVE wells SVE-1 through SVE-3 and existing AS <br /> well ASA and to install additional AS wells AS-2 through AS-7. ATC proposes installing the <br /> SVE and AS systems in an existing remedial compound located at the north end of the current <br /> Site building. Table 1 below presents existing and proposed monitoring and remedial well <br /> construction details, and December 2016 (most recent) groundwater data. <br /> KARL E. LONGLEY SCD, P.E., CHAIR I PAMELA C. CREEDON P.E., BCEE, EXECUTIVE OFFICER <br /> 11020 Sun Center Drive 0200,Rancho Cordova,CA 95670 1 www.waterboards.ca.gov/centralva(ley <br /> Co RECYCLED PAPER <br />