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Row KLEIN FELDER Quantitatively analyzed samples with PID readings less than 100 ppmv did not contain detectable concentrations of petroleum hydrocarbons. Samples collected for potential quantitative analysis were collected in a modified California split -spoon sampler lined with three brass (or stainless steel) tubes. Upon opening the sampler, the bottom tube was immediately sealed with Teflon sheeting and plastic caps, labeled, logged on a chain -of -custody, and placed in an iced cooler. Based on the results of the January 1993 drilling, Kleinfelder drilled four additional borings in the vicinity of T2/T3 on February 3, 1993 (Plate 2). Soil samples were collected using the same protocol outlined above. Depth to groundwater measurements were collected and the three monitoring wells were surveyed on the same date. The groundwater gradient direction was calculated using the depth to groundwater measurements collected on January 26 and February 3, 1993, and the surveyed casin elevations. On both dates, the slope of the gradient was found to be relatively flat (1.3 x 10- and 6.7 x 104 respectively). The gradient direction on January 26, 1993 was to the south, while on February 3, 1993; the direction was more westerly. The gradient information is presented on Plate 3. The data used to calculate the gradient is presented on Table 1. Ten soil samples from the boreholes drilled in January 1993, and one soil sample from each boring drilled in February 1993, (14 total) were submitted to Superior Precision Analytical Laboratories, Inc. (Superior) in Martinez, California. Superior is certified by the State of California Department of Toxic Substances Control (DTSC) for the requested analyses. The soil samples were selected based on field observations, screening readings, and depth. The soil samples were analyzed for: Extractable Total Petroleum Hydrocarbons (TPH-D) Purgeable Total Petroleum Hydrocarbons (TPH-G) Benzene, Toluene, Ethylbenzene and Xylenes (BTEX) The 20 -foot sample from each of the January borings (Sample Nos. 71223, 71233, 71241, and 71507) contained TPH above 100 mg/kg. In addition, the 15 -foot sample (No. 71240) from MW -3 and the 30 -foot sample (No. 71235) from B-3 contained 17 and 15 mg/kg of TPH (purgeable and extractable combined) respectively. The laboratory reported on each of the positive extractable TPH analyses that the pattern of peaks in the chromatogram is typical of hydrocarbons lighter than diesel. None of the samples submitted from the February drilling contained TPH-D, TPH-G, or BTEX. The analytical results for the soil samples is presented on Plate 4. The first set of water samples were submitted to Superior. The samples were analyzed for: ► TPH-D PP19117t ► TPH-G ► BTEX Ethylene Dibromide (EDB) APR 2 3 1993 Lead ENVIRONMENTAL HEALTH None of the samples contained the above constituents. The analytical results aKWa4WdIW Table 2. FWP3-2(1993) Page 2 of 4 24-220152-D00 Copyright 1993 Kleinfelder, Inc. tN