SITE INFORMATION AND CORRESPONDENCE

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Stantec Quarterly Status Summary Report— Third Quarter 2012 Stockton Charter Way Commingled Plume October 12, 2012 warehouse building; no USTs or fuel dispensers are present on the property. Former Texaco (Shell) is currently comprised of a station building, a car wash, four fuel dispenser islands, and four USTs. No changes have been made to the previous investigations and site history since the Corrective Action Plan (CAP), prepared by Stantec and dated June 19, 2012. Sensitive Receptors There are no known water wells within one quarter mile of the Site. The nearest surface water body is the Mormon Slough, located approximately 2,800 ft to the north-northeast and down- gradient of the Site. Monitoring and Sampling No groundwater monitoring and sampling was conducted during 3Q12. Current Assessment Activities No assessment activities were conducted during 3Q12. Remediation Status There is no active remediation operating at the Site. Characterization Status Petroleum hydrocarbon impacts in the soil are adequately delineated by the historical analytical data and previous assessment activities. Petroleum hydrocarbon impacts in the groundwater need further delineation as described in the Site Conceptual Model dated January 14, 2011. The Further Assessment Work Plan (Work Plan) submitted to CRWQCB-CVR on February 15, 2011 included details of the proposed assessment activities to fill in the identified data gaps. In a meeting with the CRWQCB-CVR, Stantec, and the responsible parties (RPs) on March 16, 2011, the CRWQCB-CVR suggested that active remediation be implemented at Chevron Facility #9-2033 (the most upgradient location of the Site) and that the proposed assessment activities be postponed pending remediation. In consideration of CRWQCB-CVR's input and the Site assessment data, the RPs have agreed that implementing active remediation at Chevron Facility #9-2033 will be most cost-beneficial in advancing the Site closer to "no further action" criteria. The CAP submitted to CRWQCB-CVR on June 19, 2012 included detailed evaluation of the full- scale air sparge (AS) and soil vapor extraction (SVE) system design and a schedule for implementation and reporting, including target date for system startup per evaluations performed during recent pilot test and also proposed to install five additional SVE wells and ten additional AS wells for Chevron Facility#9-2033. Waste Disposal Summary No investigate-derived waste was generated during 3Q12. Recent Correspondence The CRWQCB-CVR commented on the CAP dated June 19, 2012 and approved Stantec's recommendation to install a full-scale AS/SVE system and additional AS and SVE remediation wells in a letter dated July 10, 2012. Stockton Charter Way Commingled Plume QSSR 3Q12.Final.doc 2