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CLEARWATER <br /> G R O U P, I N C <br /> 3.0 FIELD ACTMTIES <br />' Clearwater began quarterly groundwater monitoring and sampling at the subject <br /> location in December 1994 All field work has been conducted according to <br />' Clearwater Field Procedures (previously submitted) which are consistent with both <br /> local and state guidelines <br />' Prior to sampling, each monitoring well was gauged to the nearest hundredth of a <br /> foot The wells were purged of at least three well casing volumes and purge water <br /> temperature, conductivity, and pH measurements were collected. The wells were <br />' purged until the parameters stabilized Monitoring well gauging and purge data are <br /> included in Appendix A <br />' Each groundwater sample was collected with a dedicated polyethylene bailer and <br /> was transferred to sample containers appropriate for the required analyses Sample <br /> containers were labeled with well numbers and placed in a cooler A chain-of- <br /> custody was prepared and accompanied the samples to the laboratory Groundwater <br /> sample analyses were performed by American Environmental Network (AEN), <br /> DHS-certified laboratory located in Pleasant Hill, California. All groundwater <br /> samples were analyzed for TPHg by EPA Method 5030 (purge and trap) with <br /> detection using gas chromatography flame ionization detectors All groundwater <br /> samples were analyzed for BTEX by EPA Method 8020 <br /> 4.0 RESULTS <br /> 4.1 Water Level Monitoring Data <br /> IGroundwater elevations ranged from -16 64 to -16 94 feet mean sea level (MSL) on <br /> December 11, 1995 The depth to water in each well was measured from the top of <br /> the well casing, which had been surveyed relative to MSL Water level data are <br /> presented in Table 1, and groundwater elevation contours are presented on Figure 3 <br /> The local groundwater flow is estimated to be northeasterly at an approximate <br /> gradient of 0 6% (0 006 ft/ft), which is consistent with results obtained during <br /> previous monitoring events <br /> I4.2 Groundwater Analytical Results <br /> TPHg and BTEX were not detected at or above laboratory reporting limits in the <br /> groundwater sample collected from monitoring well MW-1 TPHg was not detected <br /> D-103 4Q95 <br /> 2 January 25, 1996 <br /> I <br />