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r v Beacon Station No 641 August 2, 1996 1210 East Hammer Lane Stockton .California Letter Report exhibited no observable consequential corrosion After the removal of the USTs, soil samples were collected from the native soil located approximately 2 feet below each end of the USTs f Soil samples and excavated soil removed ;from the cavity were evaluated in the.field.utilizing a photoiomzation detector (PID) The UST and,soil sample locations are depicted on.the attached Figure 2 After removal of the product_ lines and dispensers, soil samples were collected from the native soil in the product line trench and';,beneath the former dispenser locations at a depth of approximately 2 to 3 feet below the base of the trenches (see Figure 2) The soil samples were submitted to a state-certified laboratory for analyses with results to be reported the following morning On June 12, based on laboratory results from the previous day, additional samples were collected from test holes bored 18 to 19 feet bsg on the western and eastern portion of T1, and the western portion of T2 Locations of-theses samples are depicted on Figure 2 The dispenser area and product line trench was excavated to approximately one foot below the depth of previously collected samples or approximately 4 to 5 feet bsg The PID indicated that gasoline hydrocarbons were present in the soil excavated from the test holes Additional excavation was halted and the samples collected from the.test pits were submitted to the laboratory Harlin Knoll 4 was onsite to observe collection of the additional samples The UST cavity was excavated to approximately 18-19 feet in its western side to allow.for. installation of the new USTs The completed extent of the excavation is shown Figure 2 Analytical Results Selected soil samples collected from the UST cavity excavations, and product lines and dispenser excavations were submitted under chain of custody (COC) to West Analytical Laboratory in Davis, California (Certification No 1346) .The samples were analyzed for Total Petroleum Hydrocarbons as gasoline (TPHg); the volatile aromatics benzene, toluene, ethylbenzene, and total xylenes (BTEX), using modified U S Environmental Protection Agency (USEPA) methods 5030/8015 and 5030//8020,.respectively, ;dead using USEPA method ICP by SW 846 method d010, and Methyl-tertiary-butyl ether MTBE using USEPA method 8020/602 ,In addition the soil samples collected from the stockpile of excavated soil were composited'in the laboratory and analyzed for TPHg ,BTEX, and lead Soil samples analyzed from the UST excavation ranged from below laboratory detection limits (S-14-T4w)to 6,800.milli grams per kilogram (mg/kg) (S-19-T1e) for TPHg BTEX constituents ranged from less than laboratory detection limits (S-14-T4w) to 930 mg/kg (S-19-Tle) TPHg and BTEX were below laboratory detection limits in the samples analyzed from the product line trench Gasoline hydrocarbons were detected in the soil samples collected from beneath the dispensers, ranging from below laboratory;detection limits(S-D-NW, S-D-ME, and S-D-MW) to 3 6 mg/kg (S-D-SW) Total lead was detected in soil samples analyzed from the UST excavation 1641-11 rpt 2 HORIZON ENVIRONMENTAL INC