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S E C ® R • 7-Eleven Store Number 19976 Fuel System Upgrade Report August 7, 2003 Page 5 RESULTS Soil Sample Analytical Results —Dispensers, Fuel Lines, and USTs The analytical results are presented in Figure 2 and are summarized in Table 1 Copies of the analytical reports and chain-of-custody documentation are included in Attachment C Sod samples were collected beneath the northern dispenser, beneath the fuel delivery piping between the dispensers and the USTs, and beneath the ends of the USTs The soil samples collected beneath the dispenser and fuel delivery piping did not contain concentrations of TPHg, BTEX, or fuel oxygenates above laboratory detection limits (Table 1) TPHg, BTEX, and fuel oxygenates were not detected at concentrations above laboratory detection limits in two of the six soil samples collected beneath the USTs Benzene and TPHg were reported in the soil samples collected beneath the north ends of two USTs (T1N, T2N) at maximum concentrations of 0 0087 mglkg and 9 3 mglkg, respectively MtBE and TBA were reported at maximum concentrations of 3 3 mg/kg (T1 N@13') and 18 mg/kg (T3N@13'), respectively (Table 1) Stockpiled Soil Sample Analytical Results and Disposal 1 On May 26, 2003, Glacier began removal of the pea gravel covering the three USTs and temporarily stockpiled the material onsite After UST removal, Glacier removed additional pea gravel for temporary stockpiling On June 9, 2003, three composite samples (SP-1[AB], SP-2[AB], and SP- 3[AB]) were collected from the pea gravel stockpile On June 21, 2003, two composite stockpile samples (SP-4[ABCD] and SP-5[ABCDJ) were collected from the soil generated during UST pit expansion The five soil samples were submitted to Kiff Analytical for analysis Copies of the field notes are included in Attachment C and summarized in Table 2 Soil samples were collected by advancing 2-inch diameter brass sample liners into the soil stockpile, after removing approximately 6 inches to 1 foot of surface material in the sample location A total of two brass sleeves were collected for composite samples SP-1(AB), SP-2(AB), and SP-3(AB), and i four brass sleeves were collected for composite sod samples SP-4(ABCD) and SP-5(ABCD) Each brass sleeve was labeled and capped with Teflon sheets and plastic end caps The samples were �* then sealed in zip-lock bags, placed on ice, and transported to the laboratory accompanied by the appropriate chain-of-custody documentation The sample sleeves were combined in the laboratory into a single composite soil sample and analyzed for TPHg, BTEX, and MtBE by EPA Method 82608, and for total lead by EPA Method 7421 Referring to Table 2 and the analytical data included in Attachment C, TPHg, BTEX, and MtBE were not reported in the five composite samples at concentrations above laboratory reporting limits Total lead was reported at a maximum concentration of 3 71 milligrams per kilogram (mg/kg) SECOR notified SJCEHD of the pea gravel analyses and requested reuse of the pea gravel for UST pit backfill The SJCEHD approved reuse of the pea gravel only if it was screened to remove any debris before placement back into the UST pit Glacier screened the pea gravel stockpile and placed the pea gravel in the excavation during the UST installation project . On June 21, 2003, 16 truck loads (424 tons) of soil excavated during the UST pit expansion was hauled to Forward Landfill in Manteca, CA, under non-hazardous waste manifest documentation (Attachment B) Copies of the Non-Hazardous Waste Manifests are included in Attachment B 19976 Fuel Line&USTs Upgrade Report1 doc SECOR International Incorporated