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2.0 METHODS AND PROCEDURES <br /> i <br /> i <br /> 21 GROUNDWATER LEVEL MEASUREMENT <br /> Depth to ground water was measured In all wells using an electronic well sounder on <br /> ' September 23, 1993 <br /> 2.2 GROUND WATER SAMPLING <br /> Following the depth to water measurements, approximately four well-casing volumes of <br />' ground water was purged from each well using an electric submersible pump. The purge <br /> water was stored in DOT-approved drums pending analysis and proper disposal. Ground <br /> water samples were collected from wells MW-1 through MW-4 using new disposable <br /> polyethylene bailers lowered into each well with new nylon cord. A duplicate sample was <br /> also collected from well MW-4 for quality control purposes. The samples were decanted <br /> from the bailers into 40-milliliter clear glass vials containing a trace amount of hydrochloric <br /> acid (used as a preservative) and 1-liter amber bottles. The samples were immediately <br /> labeled and placed on ice, along with a laboratory supplied trip blank, consisting of <br /> delonized water, for transport under chain of custody to the laboratory. Ground water <br /> sampling data forms are Included as Appendix A. <br /> All water samples were submitted to Curtis and Tompkins, Ltd (C&T) of Berkeley, <br /> California, a state-cert'if'ied laboratory, for analysis of TPH-D and BTEX by EPA Methods <br /> 8015 modified and 8020 The trip blank was also analyzed for BTEX. <br /> 1 <br /> 1 <br /> Environmental Science <br /> F\6925009\3gmr 943 3 8c Engmeenng,Inc <br /> 1 <br />