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CLEARWATER <br /> G R O U P, [ N C. <br /> Environnrentai Services <br /> 3.0 FIELD ACTIVITIES <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 and for BTEX with <br /> methyl tertiary-butyl ether (MTBE) by EPA Method 8020. <br /> D-103 1Q96 2 April. 4, 1996 <br />