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PRIVILEGED &CONFIDENTIAL f • MTBE and other fuel oxygenates were not reported in the soil or groundwater samples collected; and • A review of a historical photograph of the site, historical Sanborn Fire Insurance �., Maps, and the current concentrations of TPH-g and benzene, indicate that the most probable locations of former underground storage tanks (USTs) were east of the former pump island, near the corner of East Market Street and South Wilson w Way, which is beneath the current bank building. Based on the above-described observations, analytical results, and telephone conversations with the SJCEHD, Building Analytics has concluded that the TPH plume +•• beneath the site has been sufficiently delineated, has not significantly impacted the site, and does not pose a significant threat to human health. 2.7 Request for No Further Action, December 1998 Based on field observations, analytical results, and telephone conversations with the SJCEHD, Building Analytics concluded that the TPH plume beneath the site had been sufficiently delineated, did not significantly impact the site, and does not pose a significant threat to human health. Mass balance calculations for TPH remaining in the L„ soil and groundwater were performed by Building Analytics. The calculations revealed that only approximately 86 gallons of TPH remain in the soil, and less than one gallon remains in the groundwater. Building Analytics therefore requested closure of the case from the SJCEHD and a "No Further Action" order. V.r 2.8 SJCEHD Letter, June 29, 1999 r✓ In June of 1999, the SJCEHD issued a letter stating that the Central Valley Regional Water Quality Control Board (RWQCB) had been notified that the SJCEHD had concluded that the site investigation and remedial action had been completed for the subject property. In the letter, the SJCEHD requested that the on-site groundwater monitoring wells be destroyed under permit and inspection by their agency. The SJCEHD requested that the permit be submitted by August 2, 1999. Once the monitoring wells had been destroyed, the SJCEHD would issue a "No Further Action" letter. This work plan is in response to the June 29, 1999 SJCEHD letter. "r 3.0 SITE LOCATION AND IMPROVEMENTS The site is located at 49 South Wilson Way, on the northwest corner of Wilson Way and Market Street, in the City of Stockton, San Joaquin County, California (Figure 1). The site is located in the northeast quarter of Section 32, Township 1 North, Range 6 East, of the Mount Diablo Base and Meridian. The subject property is currently occupied by a i„ bank building. 4.0 GEOLOGIC AND HYDROGEOLOGIC SETTING Stockton is located in the western portion of the Great Valley geomorphic province of California. The valley is a nearly flat lying, elongate trough trending northwest and �., southeast for approximately 450 miles. The valley is bordered by the igneous Sierra Nevada to the east and the sedimentary and metamorphic Coast Ranges to the west. The 4 199164—WFB,Stockton Well Abandonment Work Plan V