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n KLEINFELDER be purged from the well until the discharge runs relatively clear of fines. Approximately five to ten well volumes will be removed from.each monitoring well. To reduce the potential for introducing contamination, the developing equipment will be dashed in a non-phosphate solution and rinsed in distilled water prior to use in the monitoring well. mater produced during development will be containerized in 55-gallon drums and will become the responsibility of Pintail,Inc. Saml2lina The aquifer will be allowed to equilibrate.for at Ieast 48 hours after development. The well will then be purged and sampled_ Purging and sampling will be performed with a QED bladder pump. During the purging of the well; field parameters (pia,conductivity, and temperature)will be monitored. Samples will be collected after field parameters have stabilized and at least 5 well-volumes of water have been removed from. the well. Samples will be collected in appropriate sterile and IW preserved containers supplied by the analytical laboratory. The sample containers will then immediately be sealed, labeled,. and placed in an iced cooler. At the end of the day, one water sample from the well will be delivered under chain-of custody to the analytical laboratory for analysis of. o Volatile Organic Compounds by EPA,Methods 601 and 602 o Metals by ICAP o Mercury,Selenium,and Arsenic by AA o General Minerals 3.3 ASSESSMENT OF SURFACE WATER Two water samples will be collected from the Mokolumne River to assess surface water quality. One sample will be collected upgradient of'the landfill (under the Southern Pacific Railroad bridge) and one sample will be collected at the downgradient (southeast) corner of the landfill. The temperature,pH, and electrical conductivity of the water at the sample location will be measured. Prior to collecting each sample, all sampling equipment will be decontaminated 137-38-:1663 8