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I <br /> usmg a new disposable plastic bailer The samples were placed m 40-nil EPA vials and 1- <br /> liter amber bottles, and transported in a chilled container to Pan-Agncultural Laboratories, <br /> Incorporated (PAL) for analysis <br /> 3.5 Laboratory Analysis of Soil and Water Samples <br /> Selected soil samples were analyzed for total petroleum hydrocarbons(TPH) as gasoline and <br /> diesel, and volatile aromatics (BTE&X) in accordance with EPA methods 8015m and 8020, <br /> respectively. Water samples were analyzed for TPH as gasoline and diesel and BTE&X in <br /> accordance with EPA methods 8015m and 602, respectively <br /> ' 4.0 FINDINGS <br /> 4.1 Stratigraphy <br /> Alternating fine- to medium-grained sands and sandy silts were encountered in all borings <br /> at the site to depths of 15 feet Fine- to coarse-grained sands were encountered from depths <br /> of 15 to 35 feet at the site Interbedded clayey-silts and medium sands were encountered at <br /> depths between 20 and 25 feet in MW2 and B7 The Boring Logs are included m Appendix <br /> A <br /> 4.2 Field Evidence of Soil Contamination <br /> Slight to moderate gasoline-odors were detected in all soil borings by the field geologist <br /> during drilling Organic vapors detected in MW1 were measured below 50 parts per mullion <br /> (ppm) in all collected samples Organic vapors were detected in MW2 at 675 ppm at 15 feet <br /> below ground surface (bgs), the levels decreased from 675 ppm to 8 4 ppm at 34 feet bgs <br /> In MW3, organic vapors were detected at 126 ppm at 15 feet bgs, decreasing to 18 ppm at <br /> 30 feet bgs <br /> Organic vapors in boring B4 ranged from a high of 646 at 15 feet bgs, decreasing to 7 0 ppm <br /> at 23 5 feet bgs Organic vapors in bonng B5 were detected at 663 ppm at 10 feet bgs In <br /> boring B6, organic vapors were detected at 519 ppm at 15 feet bgs Borings B5 and B6 were <br /> terminated based on the detection of organic vapors at moderately high levels Organic <br /> vapors in borings B7 and B8 at 20 feet bgs were detected at 178 ppm and 264 ppm, <br /> ,respectively <br /> ' 4.3 Soil Sample Analysis <br /> A total of 14 soil samples were submitted to PAL for analysis No samples from B5 were <br /> analyzed because field evidence indicated obvious petroleum hydrocarbon contamination <br /> B5 was drilled approximately 15 feet east of the former UST near the auto shop and was <br /> terminated a depth of 10 feet The soil sample analyses are summarized in Table 3 <br /> 0- 1 7 <br /> 1 <br />