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n .a <br /> CLEARWATER <br /> G K O U P [ N <br /> Eat iron w,-,10 S,rc ices <br /> 3.0 FIELD ACTIVITIES <br /> Field work was performed in accordance with Clearwater Field Procedures <br /> (previously submitted) and under the directives and guidelines established by the <br /> PHS/EHD and the Central Valley Regional Water Quality Control Board All <br /> monitoring wells were gauged and sampled on March 21, 1997 At the request of the <br /> PHS/EHD, Clearwater also measured dissolved oxygen in groundwater from each of <br /> the monitoring wells <br /> Depth to water was gauged from the survey mark at the top of each well casing <br /> Prior to sampling, all wells were purged of a minimum of three well volumes <br /> During groundwater purging operations, the temperature, conductivity, pH, and <br /> dissolved oxygen were measured in water removed from each well The parameters <br /> and well purging data are presented in Appendix A <br /> Groundwater samples were collected from the monitoring wells using dedicated <br /> polyethylene bailers Well numbers and sampling information were recorded on <br /> sample labels and documented on a chain-of-custody form The samples were then <br /> placed in a chilled cooler for transport to American Environmental Network (AEN), <br /> a state DHS-certified laboratory located in Pleasant Hill, California All groundwater <br /> samples were analyzed for total petroleum hydrocarbons as gasoline (TPHg) by EPA <br /> Method 8015 (5030/GCFID), for benzene, toluene, ethylbenzene and total xylenes <br /> (BTEX), and methyl tert-butyl ether (MTBE) by EPA Method 8020 <br /> I <br /> D-101 IQ97 2 Apnl 15, 1997 <br />