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GCOMATRIX <br /> 36.59, 36.23, and 37.2 feet below the top of the well casing(TOC),respectively. During the <br /> May 2002 sampling event, groundwater flow appeared to be toward the east-northeast at a <br /> relatively flat gradient of approximately 0.005 feet/feet (26.4 feet/mile), which is flatter than <br /> the July 1998 sampling event gradient of 0.01 feet/feet (58.2 feet/mile). MWA contained <br /> approximately 3 inches of separate-phase petroleum. Water-level elevations and separate phase <br /> thickness are shown on Table 7. A potentiometric surface map is presented on Figure 3. <br /> 5.2 SDIL RESULTS <br /> Evidence of petroleum hydrocarbons (i.e., odor and/or visual presence)was observed at depths <br /> of approximately 9 to 10 feet bgs in SB-10, 16 to 65 feet bgs in SB-9, and 35 to 45 feet bgs in <br /> SB-14. <br /> The chemical data from the Geomatrix soil samples were generally consistent with field obser- <br /> vations and are summarized in Table 3 and presented on Figure 4. <br /> TPHc was detected in soil samples collected at three sample boring locations SB-9, SB-10, and <br /> SB-14 as follows: <br /> • SB-9 at 260 mg/kg, 3,400 mg/kg, and 60 mg/kg at 2,45, and 81 feet bgs, <br /> respectively; <br /> • SB-10 at 140 mg/kg, 2500 mg/kg, and 27,000 mg/kg at 2, 5,and 10 ft bgs, <br /> respectively; and, <br /> • SB-14 at 1,900 mg/kg and 2400 mg/kg at 40 and 45 ft bgs,respectively. <br /> No TPHc was detected in SB-11, SB-12, or SB-13. <br /> Various BTEX compounds were detected at each boring location, as follows: BTEX was <br /> detected in soil samples collected from SB-9 and SB-14 at depths below 40 feet at concentra- <br /> tions less than 1.5 mg/kg. Concentrations of TEX were detected in soil samples collected from <br /> SB-10 at concentrations less than 3.5 mg/kg. Toluene was detected in SB-11, SB-12, and <br /> SB-13 at concentrations less than 0.06 mg/kg. <br /> PAHs were detected at various depths in soil samples collected from SB-9 (45 and 81 feet bgs), <br /> SB-10(2 and 10 feet bgs),and SB-14(40 and 45 feet bgs). In general, concentrations were less <br /> than 1 mg/kg,with the exception of some PAHs present in sample SB-10 collected from a <br /> depth of 10 feet bgs(e.g., chrysene at lmg/kg and naphthalene at 7.5 mg/kg). PAHs were not <br /> detected in samples from SB-11, SB-12, and SB-13. <br /> 1:llloc_Wrf 5000s15011.00VRepwtZoiI and GW Report.doc 8 <br />