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ATC Assoc,ates, Inc Project No 99975 7501 <br /> reduction potential of the samples were also measured Appendix A contains copies of the <br /> Purge/Sampling Worksheets <br /> ' - ontammatzon between wells all measuring, purging and <br /> To minimize potential cross c g� p g $ <br /> ' sampling equipment was washed in an non-phosphate detergent solution, rinsed with tap <br /> water, and then rinsed with distilled water prior to sampling each well <br /> ' The sampling procedures for each monitoring well consisted of extracting well water with <br /> a clean TeflonTm bailer attached to a clean nylon cord Water collected for analysis of TPHg <br /> and BTEX was decanted into 40-milliliter glass vials with TeflonTM-lined septa The <br /> ' samples were preserved with hydrochloric acid and acidified to a pH of approximately 2 0 <br /> All samples were labeled and placed in a refrigerated cooler with the chain-of-custody <br /> document Samples transported to the laboratory were analyzed within the specified holding <br /> time Samples stored overnight at ATC were refrigerated at a temperature of <br /> approximately 4°Celsius <br /> ' The groundwater samples were analyzed for TPHg utilizing EPA Method 8015M, for BTEX <br /> and MTBE utilizing EPA Test Method 8020 One trip blank was submitted with the <br /> ' samples for analytical quality control <br /> • Groundwater produced during purging and sampling was contained to 55-gallon drums and <br /> temporarily stored at the site <br /> ' 3.0 RESULTS <br /> 3.1 Analytical Results <br /> ' A summary of all groundwater analytical results to date, including the most resent (and <br /> previously unreported)July 1999 results,are presented in Table 2 and are also shown on Figure <br /> 3 The results are further discussed under Section 4 0 <br /> 3.2 Groundwater Elevations and Gradients <br /> t A summaryof the groundwater elevation measurements from current ATC and previous OST <br /> g <br /> monitoring is shown on Table 3 Groundwater elevation contours for the July 1999 results are <br /> ' presented to Figure 4 Copies of the field purge/sampling worksheets are included as <br /> Appendix A Historical groundwater elevation data and groundwater gradients are included to <br /> ' Appendix B <br /> Groundwater Monitoring and Remediation Status Report Page 2 <br /> 1 <br />