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Results of the groundwater sampling indicate that low concentrations of TPH-as-gasoline and BTEX compounds are present in each of the three wells The highest concentration of TPH-as- gasoline was detected in MW-3 at 770 µg/l- The highest concentration of benzene was detected in MW-2 at 3 7µg/L Methyl tertiary butyl ether (MTBE) was not detected in any of the ` wehs The results of the groundwater sample analyses are summarized in Table 2 In January 1997, IT Corporation conducted a water well surrey A total of 12 water wells were discovered within a Y2-mile radius of the site The nearest water well is located approximately 1,000 feet north of the site The locations of these water wells are posted on Figure 4 The water well depths, screen intervals and other pertinent information are summarized in Table 5 Immediately north of the site is Mormon Slough, a surface water body flowing in a shallow channel The depth of the channel is approximately 20 feet bgs Tank B The history of Tank B is not clear in the regulatory record According to a Worm Plan for Permanent Closure of Underground Storage Tanks at the Fabncare Facility, published by AEMC on September 30, 1988, a 10,000-gallon diesel UST (Tank B) buried inside of a former metal budding was abandoned in-place by Fabncare employees in 1974 Allegedly the tank was filled with sand, gravel and cement mix poured into the tank through the tank's fill pipe On May 8, 1992, after the demolition of the metal budding, Semco Corporation removed a 1,000- gallon diesel UST from the location of Tank B Based on this discovery, it is possible that the 10,000-gallon UST never existed During the removal of the 1,000-gallon UST, the PHS/EHD inspector noted no petroleum odor or sod discoloration Two soil samples collected for analysis from beneath the ends of the former UST did not contain detectable concentrations of TPH-as- gasoline, TPH-as-diesel or BTEX compounds The analytical results from the soil sampling are summarized in Table 6 Tanks C and D ' On December 1, 1988 AEMC drilled two vertical sod borings and two angled soil borings adjacent to and directly beneath both ends of the two 5,000-gallon underground diesel storage tanks Sod samples collected for analysis from the soil borings indicated that the only compound detected was toluene at a concentration of 0 089 ppm TPH-as-diesel, TPH-as-gasoline and benzene, ethylbenzene and xylenes were not detected in any of the soil samples The results of the sod sample analyses are summarized in Table 6 4 r