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i was detected in groundwater samples from wells MW-2 through MW-5 at concentrations of 12 ppb, 47 ppb and 980 ppb, respectively.' A corrective action plan was submitted to SJCEHD on March 1996.3 According to this report,additional hydrocarbon-impacted soil may be present northwest of the former tank area and north of the site, on the Wells Fargo Bank property. Finally, Advanced GeoEnviron mental, Inc. concluded that, based upon feasibility studies and analysis performed at the Top Filling Station site,a soil vapor extraction system is recommended for the remediation of hydrocarbon-impacted soils,and that additional assessment is needed for ' the remediation of hydrocarbon-impacted groundwater. City of Stockton Right of Way The incident involving the City of Stockton Right of Way, 102 South Wilson Way, is immediately south of the subject property. On September 19, 1986, two 500-gallon USTs were removed from this location. Subsequent laboratory analyses indicated that there has not been a release of petroleum hydrocarbons beneath the tanks. Therefore, SJCEHD determined that no additional investigations were warranted at that time.4 49 South Wilson Way Regarding the subject site, which is located at 49 South Wilson Way, a "Notice of Reimbursement" was issued on July 3, 1996, requesting that Wells Fargo Bank conduct a site assessment to determine the extent of contamination in an area adjacent to a UST, the location of which was indicated on a 1950 Sanborn fire insurance map. In a letter to Wells Fargo Bank from the SJCEHD, dated July 3, 1996, Ms. Turkatte has requested that Wells Fargo Bank conduct additional Phase II activities to further investigate Pf the extent of the groundwater contamination. The agency required the submittal of a Phase II Work Plan on or before September 6, 1996. The work plan was submitted to the SJCEHD on September 6, 1996. Ms. Turkatte was contacted in October and November, 1996 regarding the status of the work plan. Ms. Turkatte suggested that the proposed monitoring well MW-1 be moved to the west side of the bank building (Figure 1). The subsurface conditions beneath the bank building were unknown. Borings to explore this area would be necessary to determine if the subsurface soils had been impacted by ' former on-site conditions. Building Analytics proposed the drilling of two borings inside the building. Proposed borings P-6 and P-7 were located within the interior of the bank building. These boring were proposed to be advanced to a maximum depth of 25 feet bgs or refusal and samples would be collected a 5-foot intervals. Ms. Turkette has approved the revised workplan of Building Analytics dated December 5, 1996. Knowles Roek Site and Top Filling Station Data Review Building Analytics reviewed analytical and groundwater elevation data from the November 1996 Groundwater Monitoring of the Knowles Roek site and the January 1997 Groundwater Monitoring Report of the Top Filling Station. 2 Advanced GeoEnvironmental, Inc., Groundwater Monitoring Report - January 1997, Top Filling Station, 101 South Wilson Way, Stockton, California, June 12, 1996. 3 Advanced GeoEnviran mental, Inc., Corrective Action Plan - March 1996, Top Filling Station, 101 South Wilson Way, Stockton, California. March 20, 1996. 4 San Joaquin County Public Health Services, Environmental Health Division, letter of September 16, 1993 regarding 102 South Wilson Way, Stockton, California. 3 197046a - Stockton 1