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StantK <br /> Quarterly Status Summary Report—First Quarter 2012 <br /> Stockton Charter Way Commingled Plume <br /> April 20, 2012 <br /> warehouse building; no USTs or fuel dispensers are present on the property. Former Texaco <br /> (Shell) is currently comprised of a station building, a car wash, four fuel dispenser islands, and <br /> four USTs. No changes have been made to the previous investigations and site history since <br /> the last report submittal (Pilot Test Report, February 15, 2012). <br /> Sensitive Receptors <br /> There are no known water wells within one quarter mile of the Site. The nearest surface water <br /> body is the Mormon Slough, located approximately 2,800 ft to the north-northeast and down- <br /> gradient of the Site. <br /> Monitoring and Sampling <br /> No groundwater monitoring and sampling was conducted during 1Q12. <br /> Current Assessment Activities <br /> No assessment activities were conducted during 1Q12. <br /> Remediation Status <br /> There is no active remediation operating at the Site. <br /> Characterization Status <br /> Petroleum hydrocarbon impacts in the soil are adequately delineated by the historical analytical <br /> data and previous assessment activities. Petroleum hydrocarbon impacts in the groundwater <br /> need further delineation as described in the Site Conceptual Model dated January 14, 2011. <br /> The Further Assessment Work Plan (Work Plan) submitted to CRWQCB-CVR on February 15, <br /> 2011 included details of the proposed assessment activities to fill in the identified data gaps. In <br /> a meeting with the CRWQCB-CVR, Stantec, and the responsible parties (RPs) on March 16, <br /> 2011, the CRWQCB-CVR suggested that active remediation be implemented at Chevron <br /> Facility #9-2033 (the most upgradient location of the Site) and that the proposed assessment <br /> activities be postponed pending remediation. In consideration of CRWQCB-CVR's input and <br /> the Site assessment data, the RPs have agreed that implementing active remediation at <br /> Chevron Facility #9-2033 will be most cost-beneficial in advancing the Site closer to "no further <br /> action" criteria. <br /> The Feasibility Study and Pilot Test Work Plan (FS and Work Plan) submitted to CRWQCB- <br /> CVR on May 26, 2011 included an evaluation of feasible remedial alternatives for Chevron <br /> Faciltiy #9-2033 and a proposal to install remediation wells and perform pilot testing. The pilot <br /> test was designed to obtain necessary data to evaluate further the feasibility of an air sparge <br /> (AS) and soil vapor extraction (SVE) remedial strategy. CRWQCB-CVR approved the proposed <br /> scope of work described in the FS and Work Plan in a letter dated, June 1, 2011. Stantec <br /> oversaw WDC install two air sparge wells (AS-1 and AS-2), one vapor extraction well (VE-1), <br /> and two piezometers (PZ-1 and PZ-2) between October 31 and November 4, 2011. Stantec <br /> performed the AS/SVE pilot study between December 19 and 23, 2011. The well installation <br /> and pilot test activities were summarized the Pilot Test Report dated February 15, 2012. <br /> Waste Disposal Summary <br /> No investigate-derived waste was generated during 1Q12. <br /> Stockton Charter Way Commingled Plume QSSR 1012.doc 2 <br />