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MANIC{RS ES"JEFSCOIlSI._1MT$ 3.0 GROUNDWATER SAMPLING 3.1 GROUNDWATER SAMPLING METHODOLOGY Groundwater samples were collected from wells MW-1, MW-4 and MW-5 on 8 November 1996 and from well MW-5 on 9 December 1996 Since contaminants were not detected the groundwater samples collected from MW-1 and MW-4, these wells were not resampled during the 9 December sampling event Groundwater sampling worksheets are presented in Appendix C Prior to sampling, water level measurements were taken from all wells The standing water volumes within the wells scheduled for sampling were then calculated A bailer was used to remove a minimum of three well casing volumes from monitor wells MW-4 and MW-5 Approximately one well volume was removed from MW-1 because the well went dry during purging At the beginning and during the purge process, the temperature, pH and electrical conductivity of the purge water were measured This information was recorded on sampling data sheets Samples were collected with a Teflon bailer Samples were sealed in plastic bags and placed with ice in an insulated chest for delivery to the analytical laboratory The bailers used to purge and sample the wells were thoroughly cleaned pnor to use by washing with water and Alconox followed by a deionized water nnse 3.2 ANALYTICAL METHODS Allg roundwater samples were analyzed by EPA Method 8020 for BTEX and by EPA Method 8015M for TPH-G The analyses were performed by American Environmental Network in Pleasant Hill 3.3 GROUNDWATER PHYSICAL CHARACTERISTICS AND POTENTIOMETRIC SURFACE ELEVATIONS Table 3-1 presents a summary of groundwater physical characteristics and depth to water measurements collected on 8 November and 9 December 1996 Groundwater elevations decreased in MW-1 and MW-5 by 0 15 ft and 0 10 ft, respectively, between 8 November and 9 December The groundwater elevation increased by 0 90 in MW-4 over the same period L TR0IECr"ANJ0QMCL0D1 REP 8 J...Y 1997