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1 <br /> YWN('EPS DESY.4EASCUIJS7LTIM5 a <br /> SECTION 3 <br /> GROUNDWATER SAMPLING <br />' 3.1 GROUNDWATER SAMPLING METHODOLOGY <br />' Groundwater samples were collected from 2 monitor wells on 30 August 1996 Groundwater <br /> sampling worksheets are presented in Appendix C <br />' Prior to sampling, water level measurements were taken from 8 wells The standing water <br /> volumes within the 2 wells scheduled for sampling were calculated using the data obtained from <br /> the water level measurements conducted upon arrival at the site A submersible pump was used <br /> to remove a minimum of three well casing volumes from each monitor well <br />' At the beginning and during the purge process, the temperature, pH and electrical conductivity <br /> of the purge water were measured. This information was recorded on sampling data sheets <br /> Samples were collected with a Teflon bailer Samples were sealed in plastic bags and placed <br /> with ice in an insulated chest for delivery to the analytical laboratory <br /> pw� <br /> The pump used to purge and sample the wells was thoroughly cleaned prior to each use by <br /> placing it into a container of tap water, washing the outside, and pumping water and Alconox <br /> through the pump and attached hose Clean water was then pumped through the pump and hose <br /> 3.2 ANALYTICAL METHODS <br /> All groundwater samples were analyzed by EPA Method 8020 for BTEX and by EPA Method <br /> 8015M for TPH-G The analyses were performed by American Environmental Network in <br /> Pleasant Hill <br />' 3.3 GROUNDWATER PHYSICAL CHARACTERISTICS AND POTENTIOMETRIC <br /> SURFACE ELEVATIONS <br /> Table 3-1 presents a summary of groundwater physical characteristics and depth to water <br /> measurements collected on 30 August 1996 Since 26 July 1995 (the last available groundwater <br /> elevations) groundwater elevations have increased by an average of 4 4 ft <br />' L\E=r5a.\S]ClSJCH5A 1sa 1 1 OcLckcr 1996 <br />