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*VWV %.O� LW No Further Action Request 640 N,San Joaquin Street,Stockton,CA s October 9,2002 Page 2 On May 23, 2002 buried fuel pipes at the site were traced by a line locating service from the east side of the school building, through the building basement, to the north side of the building along E. Park Street. The fuel lines were also traced to a natural gas-tired boiler located inside the school building. A backhoe ;+ was used to confirm the location of the fuel pipes north of the building. On May 24, 2002 a UST (TK-1) at an approximate depth of eight feet below ground surface (bgs) was partially excavated at this location north of the school building (Figure 2). Visual inspection of the contents of TKI confirmed that the UST v stored World War II-era bunker oil,a motor oil-like heavy hydrocarbon. Condor submitted a Phase II Environmental Site Assessment Work Plan dated June 5, 2002 to the San y Joaquin County Environmental Health Department (SJCEHD). The purpose of the work was to evaluate the potential for petroleum hydrocarbon contamination in soil and/or groundwater related to the UST (TK-1). Ms. Margaret Lagorio, the Supervising Environmental Health Specialist with the SJCEHD gave verbal approval of the Work Plan on June 7, 2002. On June 10 and 11, 2002 Condor personnel supervised the advancement of four direct push borings (B-I through B-4) to collect soil samples and a groundwater sample from the vicinity of TK-1, and four hand auger borings (C-1 through C-4) to collect soil samples from below the segment of underground piping beneath the concrete basement floor of the school building. The boring locations are shown in Figure 2. Borings B-1, B-2, and B-4 were advanced to approximate depths of 20 feet bgs; groundwater was not LW encountered prior to termination of these borings. Boring B-3 was advanced to a depth of 36 feet bgs and a groundwater sample was collected. Barings C-1 through C-4 were advanced to approximately two feet ' beneath the underground piping; a soil sample was collected at this depth from each of these borings. Sample locations with analytical results for borings C-1 through C-4 and B-1 through B-4 are shown in Figure 3. Sample depths for borings B-I through B-4 are indicated on the geologic logs provided in Appendix C. LW Discrete soil samples collected from borings B-1 through B-4 were analyzed for TEPH-D, TEPH-MO, TEPH-K, BTEX, and MTBE. Soil samples collected from hand auger borings C-I through C-4 were analyzed for TPH-G and total lead (Pb) in addition to the aforementioned hydrocarbon constituents. The discrete soil sample collected from boring B-3 with the highest contaminant concentrations (3572D-B'3- 15.5') was further analyzed for CAM 17 Metals. The groundwater sample collected from boring B-3 was analyzed for TEPH-D, TEPH-MO, TEPH-K, BTEX, and MTBE. Laboratory analytical results for soil and groundwater samples and CAM 17 Metals are provided in Table D and Table E, respectively, Appendix B. L Field observations and photoionization detector(.PID) measurements suggested that the soil in borings B- 1, B-2, B-4, C-1, C-2, C-3, and C-4 was not impacted by petroleum hydrocarbons. Laboratory analytical results of all the soil samples collected from these borings indicated that all of the analytes of concern a. were not detected at or above the laboratory reporting limits. TEPH-MO was detected in the first sample collected from boring B-3 at 15 feet bgs, and concentrations of toluene, ethyl benzene, total xylenes, TEPH-D, and TEPH-MO were detected in the soil sample collected at 15.5 feet bgs (Figures 3 and 4, Appendix A). TEPH-MO was detected in the groundwater sample collected from boring B-3. MTBE was not detected in any soil or groundwater samples collected at the site. Condor described the results of the Phase 11 Environmental Site investigation in the Phase II Environmental Site Assessment Report, dated July 3, 2002. a.. ;/� CONDOR