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Quarterly Monitoring Report—First Quarter of 2010 Page 4 <br /> ' TURNER ROAD VINTNERS April 30, 2010 <br /> WKA No. 5279.03 <br /> groundwater elevations based on the recent survey results. Groundwater elevations are presented <br /> in feet above mean sea level (msl). <br /> ' 4.2 Groundwater Sampling <br /> ' In addition to DTW monitoring conducted on March 16, 2010, groundwater samples were <br /> collected from each of the five groundwater-monitoring wells. Prior to sampling, each well was <br /> ' purged of at least three casing volumes. During purging, turbidity, temperature, pH, <br /> conductivity, and total dissolved solids (TDS) measurements and/or observations were recorded <br /> for each monitoring well. <br /> 1 <br /> Dedicated low-density polyethylene (LDPE)tubing was used for each well for purging/sampling. <br /> ' Following purging of the calculated well-purge volume, groundwater samples were obtained. <br /> Each well was purged using an electric submersible pump and samples were collected from the <br /> ' purge pump discharge. All groundwater samples were collected in laboratory-preserved, <br /> analyte-specific sampling containers provided by the analytical laboratory. Samples were <br /> immediately placed in a chilled cooler and submitted under chain-of-custody documentation to <br /> ' California Laboratory Services, Inc. of Rancho Cordova, California, a California Department of <br /> Health Services-certified laboratory, for analysis as follows: <br /> ' • Nitrate-as-nitrogen <br /> • Total dissolved solids <br /> ' • Standard Minerals <br /> ' • Specific Conductivity <br /> • pH <br /> ' Well monitoring and purging equipment were cleaned prior to use in each well. Equipment <br /> cleaning rinsate and water purged from the wells were discharged into one of the aeration ponds <br /> ' on site. <br />