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i Ms. Carol Oz 2 December 17, 1999 5. BTEX (at least one constituent) were present in at least one soil sample obtained from B-1, B- 2, B-3, B-5 and MW-1. The maximum TPH-G concentration was 460 milligrams per kilograms ' (mg/kg) in the soil sample obtained from B-3 at a depth of 15 feet below ground surface (bgs). The maximum benzene concentration was 3.9 mg/kg in the soil sample obtained from B-3 at a depth of 15 feet bgs. TPH-G was present in the groundwater sample obtained from MW-1 [320 ' micrograms per liter (ug/L)]. BTEX (at least one constituent) were present in the groundwater samples obtained from MW-1 and MW-2. The maximum benzene concentration was 34 ug/L in ' the groundwater sample obtained from groundwater monitoring well MW-1. Review of the site geology indicates that two separate groundwater bearing zones may exist ' beneath the site. The upper groundwater bearing zone appears to be present from approximately 14 to 19 feet bgs, and the lower groundwater bearing zone appears to be present from ' approximately 20 to 30 feet bgs. Consequently, on October 3, 1990, Exceltech abandoned groundwater monitoring well MW-I due to the concern that this groundwater monitoring well ' could possibly connect the two groundwater bearing zones. On April 2, 1991, Exceltech completed an additional site assessment consisting of the installation of two additional groundwater monitoring wells (MW-IA and MW-5). The soil and groundwater samples (from new and existing groundwater monitoring wells) were analyzed for TPH-G and BTEX in accordance with EPA Test Methods 8015 and 8020, respectively. TPH-G and BTEX were not present in any of the soil borings. TPH-G was present in the groundwater sample obtained from MW-5 (210 ug/L). Benzene (3.4 ug/L) and xylenes (2.1 ug/L) were present in 1 groundwater sample obtained from groundwater monitoring well MW-5. On December 9, 1992, RESNA Industries Inc. (RESNA) completed an additional site assessment consisting of the installation of two additional off-site groundwater monitoring wells (MW-6 and ' MW-7). The soil and groundwater samples (from new and existing groundwater monitoring wells) were analyzed for TPH-G and BTEX in accordance with EPA Test Methods 8015 and ' 8020, respectively. TPH-G and BTEX were not present in any of the soil borings. TPH-G was present in groundwater sample obtained from MW-5 (3 50 ug/L). BTEX (at least one constituent) were present in groundwater samples obtained from MW-2 and MW-5. The maximum benzene