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TABLE 1 <br /> ANALYTICAL RESULTS OF SOIL SAMPLES* <br /> Sample Date Sample TPH as Ethyl- Total Total <br /> ID Sampled Depth Gas Benzene Toluene benzene Xylenes Lead <br /> B-1 7-87 16.2 6900 22 140 540 <br /> 26.2 2700 3.2 41 --- 160 --- <br /> 46.2 140 1.1 2.97.8 <br /> --- _-- <br /> B-2 7-87 45.7 <10 <0.5 <0.5 <0.5 <br /> B-3 7-87 45.7 <10 <0.5 <0.5 -- <0.5 -- <br /> B-4 7-92 40 ND ND ND ND ND ND <br /> 45 ND ND ND ND ND ND <br />' 50 ND ND ND ND ND 5 <br /> t 55 ND ND ND ND ND 7 <br /> B-5 7-92 45 ND ND ND ND ND ND <br />;1 50 ND ND ND ND ND ND <br /> 55 ND ND ND ND ND 6 <br /> B-6 4-93 50 ND ND ND ND SND --- <br />' 60 ND ND ND ND ND --- <br /> B-7 4-93 50 ND ND ND ND ND --- <br /> 60 ND ND ND ND ND --- <br /> B-8 4-93 50 ND ND ND ND ND --- <br /> 60 ND ND ND ND ND --- <br />!' RW-1 8-93 15 200 ND 0.74 0.82 8.6 --- <br /> 20 1100 ND 5.6 13 8i -- <br /> 25 1900 N D 20 25 140 j== <br /> 30 1500 ND 20 19 100 <br /> 35 12000 4.3 510 170 890 --- <br /> 40 1200 0.34 40 17 71 --- <br /> 45 950 0.23 29 13 57 <br /> 50 3900 1.7 190 61 290 -- <br /> -irg= ppm <br />' and MW-5 (Table 2); due to low water levels, none of the other wells could be sampled in <br /> June 1992. Measurement of the depth to groundwater in MW-1, MW-4, and MW-5 <br />' indicated that the groundwater gradient had rotated to the southwest, in accord with the <br /> regional gradient. <br />' Based on these results, GeoAudit recommended that two additional wells be installed to <br /> define the limits of groundwater contamination, one to the northwest of the building and <br /> one southwest of MW-5. Subsequently, PHS/EHD required three additional wells, all located <br /> Pact nr nnrth of MW_1 Thirafnn- C'7P.nAnrlit rPrnmmPnd&,rl that a varincP 7nnP well hp.. <br /> installed within the zone of soil contamination, that a pumping test be performed to define <br /> 0­e0",Aid"5«.i., 5 <br /> AAA PARn-28-9411.47 <br />