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h d 9 <br /> CLEARWATER <br /> C r. o 1- r i \ c <br /> . E'nvi ronnirn te!Ser=ins <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 June 16, 1997, and the dissolved <br /> oxygen was measured in groundwater from each well (at the request of the <br /> PHS/EHD) Because analytical data from groundwater samples MW-1 and MW-2 <br /> were inconsistent with previous data, those two wells were resampled on July 9, <br /> 7997 <br /> On June 16, 1997 depth to groundwater was gauged from the survey mark at the top <br /> of each well casing Prior to sampling, all wells were purged of a minimum of three <br /> well volumes During groundwater purging operations, the temperature, <br /> conductivity, pH, and dissolved oxygen were measured In water removed from each <br /> well The parameters and well purging data are presented in Appendix A <br /> Groundwater samples were collected from the monitoring wells using dedicated <br /> polyetnylene 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 /> D-101 1Q97 2 July 23, 1997 <br />