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of fuel hydrocarbon constituents were detected in the 48 8-foot sample obtained from MW-1, the 21 5- foot sample collected from MW-3, and the 36 5-foot sample collected from MW-4 Low to non-detect levels of petroleum hydrocarbon constituents were detected in the other soil samples submitted for laboratory analysis from well borings MW-1 through MW-5 Monitor well locations are illustrated on Figure 2 and soil data obtained during this assessment is summarized in Table 1 Details of this assessment were presented in the TPE Preliminary Site Assessment Report, dated September 3, 1992 In December 1993, Hydro Environmental Technologies Inc (HET) drilled and installed three ' groundwater monitor wells, designated as MW-6 through MW-8 MW-6 was placed off-site on the adjacent property to the west approximately 35 feet northwest of MW-5 MW-7 was installed adjacent and east of the on-site convenience store MW-8 was located off-site on a property east of the site across Auto Avenue Wells MW-6 through MW-8 were each completed to an approximate depth of 90 feet and screened from 70 to 90 feet bgs Petroleum hydrocarbon constituent concentrations reportedly were not detected above laboratory detection limits in the soil samples collected from well borings MW-6 through MW-8 Monitor well locations are illustrated on Figure 2 and data obtained during this assessment is summarized in Table 1 Details of this assessment are presented in the HET Phase II Subsurface ' Investigation Report, dated January 20, 1994 In December 1994 and January 1995, Brown and Caldwell (BC) drilled and installed one dual completion Lair sparge/soil vapor extraction well (AS-1/SVE-1) and two soil vapor extraction wells (SVE-2 and SVE- 3) AS-1/SVE-1 was placed approximately 5 feet east of the former UST excavation SVE-2 was '. installed in the center of the former UST excavation southeast of MW-2 SVE-3 was installed approximately 10 feet northwest of the former UST excavation AS-1 was completed to an approximate total depth of 90 feet and screened from 87 5 to 90 feet bgs SVE-1 was installed within the same borehole as AS-1 to an approximate total depth of 79 feet and screened from 69 to 79 feet bgs Wells SVE-2 and SVE-3 were each completed to an approximate depth of 65 feet and screened from 55 to 65 feet bgs Elevated levels of petroleum hydrocarbon constituent were detected in all the soil samples collected and submitted for laboratory analysis from well borings AS-1/SVE-1, SVE-2, and SVE-3 Remediation well locations are illustrated on Figure 2 and data obtained during this assessment is Lsummarized in Table 1 Details of this assessment are presented in the BC Corrective Action Plan, dated May 1995 In June 2001, Clearwater Group Inc (Clearwater) drilled and installed four groundwater monitor wells, designated as MW-9 through MW-12 MW-9 was placed approximately 20 feet northwest of the former ' UST excavation MW-10 was installed immediately north of MW-3 approximately 20 feet northeast of the former UST excavation MW-11 was located on-site approximately 20 feet south of the former UST excavation MW-12 was installed approximately 12 feet southwest of the former UST excavation Wells MW-9 through MW-12 were each completed to approximate depths of 65 feet and screened from approximately 40 to 65 feet bgs Elevated levels of fuel hydrocarbon constituents were detected in the 25, 40, and 45-foot soil samples collected from well boring MW-10, and in the 50-foot sample obtained from EZ 100966SAFSWP ATC Associates Inc S lEZ Servc\EZ 1009661Reports1100966SAFSWP ATC Project No 43 25827 0026 3