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k`! KLEINFELDER <br />The soil samples retained for laboratory analysis were collected from the 10 feet bgs and 15 feet <br />bgs. The soil samples were analyzed for the following: <br />• Total Petroleum Hydrocarbons as gasoline (TPH-g) by EPA Method 8015M <br />• Benzene, Toluene, Ethylbenzene, Xylene (BTEX) by EPA Method 8015M/8020 <br />• Oxygenates by EPA Method 8260 <br />• Methanol using Industrial Solvent Scan by EPA Method 8015M <br />• Total Extractable Petroleum Hydrocarbons (Fuel Fingerprint) by EPA Method 8015M <br />*The samples were analyzed on a standard analytical turnaround requiring approximately 10 <br />working days for analysis. <br />4.4.2 Groundwater Sampling and Analvsis <br />A total of 3 groundwater samples were collected on May 28, 2002. The groundwater samples were <br />collected from monitoring wells MW -1, MW -2, and MW -3 (Plate 2). The depth to groundwater <br />was measured in each monitoring well prior to purging and sampling. The volume of water <br />present in each monitoring well was calculated. A minimum of three well casing volumes was <br />purged from each monitoring well using disposable Teflon bailers. Groundwater field <br />parameters such as pH, electrical conductance, and temperature were recorded while purging to <br />establish stable conditions. Groundwater purge and sample logs are found in Appendix D. <br />The depths to groundwater data were converted to elevations in reference to a common datum, as <br />discussed in Section 4.3, to calculate a groundwater direction flow and gradient for the site. <br />The groundwater samples were analyzed for the following: <br />• Total Petroleum Hydrocarbons as gasoline (TPH-g) by EPA Method 8015M <br />• Benzene, Toluene, Ethylbenzene, Xylene (BTEX) by EPA Method 8015M/8020 <br />• Oxygenates by EPA Method 8260 <br />• Methanol using Industrial Solvent Scan by EPA Method 8015M <br />• Total Extractable Petroleum Hydrocarbons (Fuel Fingerprint) by EPA Method 8015M <br />*The samples were analyzed on an expedited analytical turnaround requiring 5-7 working <br />days for analysis. <br />Purge water from the monitoring wells was contained in 55 -gallon drums pending the laboratory <br />analysis of the groundwater samples.. <br />20-3978-03.CHEV / ST02R1 I 1 Page 9 of 18 <br />Copyright 2002, Kleinfelder, Inc. July 1, 2002 <br />