ARCHIVED REPORTS_MONITORING WELL INSTALLATION AND BIOSPARGE EVALUATION REPORT

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results from drilling and installation of groundwater monitoring wells in July 2009. Section 3 presents the additional evaluation of the biosparge remedy and discusses design parameters to consider for pilot testing. Based on the recently submitted CPA application, conclusions and recommendation for pilot testing the biosparge remedy will be included in discussions with the other RPs after a site conceptual model (SCM) is completed for the commingled plume. 1.1 Description of Site and Vicinity The Site occupies approximately 0.9 acre of land in Stockton, California (Figure 1). The Site is located in Township 1 North, Range 6 East of the Mount Diablo Baseline and Meridian. ' This location corresponds to—121.293453 longitude and 37.9369533 latitude. The Site is located in an area occupied by commercial and industrial businesses (Figure 2). The Site is bordered to the north by a former Texaco service station (now a independent gas station), to the east by a vacant lot, to the south by a former Dolly Madison bakery site (1426 South Lincoln Street), and to the west by South Lincoln Street. Beyond South Lincoln Street to the west are a Chevron station and the City of Stockton Corporate Yard. Beyond Charter Way to the north is a former Arco station (now a car wash) and a Transmission Shop. Five of the surrounding properties are open LUFT sites. The City of Stockton Corporate Yard also has reported releases of petroleum products. The majority of the Site is occupied by a warehouse building (Figure 3). Adjacent to the western and northern sides of the building is an asphalt-paved parking area and driveway. ' Adjacent to the eastern side of the building is an unpaved, fenced yard. Previously, Colombo/Toscana operated a distribution depot for bakery products at the Site. Mr. Edward Overton currently owns the Site and uses the warehouse building for storage. 1.2 UST History and Site Investigation Chronology ' Colombo/Toscana owned and operated two 4,000-gallon gasoline underground storage tank (UST) systems for fleet refueling at the Site. The USTs were located west of and adjacent to the warehouse building. The fuel dispenser was located inside the building near the northwestern corner. The removal of the UST systems and subsequent environmental investigations, remediation efforts, and groundwater monitoring activities are summarized in the following subsections. Historical soil sample analytical results are summarized in Table 1. Monitoring Well Construction Details are presented on Table 2. Historical Groundwater Elevation Data are ' summarized in Table 3. Historical Analytical Data for Groundwater Well Samples and Groundwater Grab Samples are summarized in Tables 4 and 5, respectfully. Historical sampling locations are presented on Figure 3. ' 1.2.1 Removal of UST System Two 4,000-gallon gasoline USTs and the fuel dispenser were removed for permanent closure in February 1994. The location of the former USTs is depicted on Figure 3. During the UST removal, the San Joaquin Health District (SJHD) inspector noted three '/2-inch diameter holes on the bottom of the southern UST (SJHD, 1994). No record is available to confirm whether Monitoring Well Installation and BioSparge Evaluation Report Prepared For:Sara Lee Bakery Group,Inc. 2 Prepared By:PSC Industrial Outsourcing,LP Sam Lee—Lincoln Street 2009-12-03-MW Installation&BioSparge Evaluation Report(F tal).doc Report Date:December 3,2009