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t` Site Background Information: Fast & Easy Mart <br /> Page 3 of 3 <br /> PREVIOUS SITE ASSESSMENTS <br /> On 31 July 2002,three soil probe boring(13-3, B-4, and B-5) were advanced east and northwest of <br /> ' the former UST excavation, and north of the former dispenser area. Discrete soil samples were <br /> collected at 5-foot intervals,beginning at 10 feet bsg,to the total depth of the wells(between 35 and <br /> 40 feet bsg). In addition, a grab ground water sample was collected from each well at total depth. <br /> TPH-g and BTEX compounds were not detected in any of the soil samples collected. MTBE was <br /> detected by EPA Method 8260 in three soil samples at concentrations of 0.016 mg/kg (B-3-30), <br /> ' 0.008 mg/kg(B-4-20),and 0.006 mg/kg(B-4-30).Analytical results of soil samples are summarized <br /> in Table 2. <br /> TPH-g was detected in the grab ground water samples from borings B-3, B-4, and B-5 at <br /> concentrations of 240 pg/l, 300 g,gd, and 180 pg/l, respectively. BTEX compounds were not <br /> detected,but MTBE and 1,2-DCA were detected by EPA Method 8260 in each of the ground water <br /> samples at maximum concentrations of 200 pg/1 (B-4) and 13 µg/1(B-5). The inferred distribution <br /> of dissolved MTBE is depicted on Figure 4, and analytical results from ground water samples are <br /> summarized in Table 2. <br /> SITE HYDROGEOLOGIC CONDITIONS <br /> ' Based upon ground water monitoring well information obtained from 248 West Harding Way <br /> ' (300 feet west of the site),ground water flow direction is inferred to be northeasterly to easterly and <br /> currently occurs at a depth of approximately 25 feet bsg within ground water wells. Ground water <br /> is located in a generally sandy layer of soil extending from approximately 35 feet bsg to 45 feet bsg <br /> (248 West Harding). Sedimentary units are believed to be relatively horizontal and continuous over <br /> the area. <br /> Advanced GeoEnvironmental,Inc. <br /> 1 <br />