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1 <br /> February 1996 - 6 - 953-7001002 <br /> 16 <br /> were abandoned during remediation activities because excavation of soil was performed in <br /> ' these areas In addition, during remedial excavations at the site groundwater was pumped <br /> from the excavation prior to backfilling Currently there are wells remaining at the site that <br /> will be abandoned after case closure as received <br /> ' The results of groundwater sampling and analysis for the site indicate that TPHg and BTEX <br /> have been generally non-detect However,sporadic detections of low concentrations of <br /> ' BTEX(i e, at or near maximum contaminant levels for drinking water)were reported in <br /> some wells The maximum historical concentrations reported for groundwater samples from <br /> morutoring wells at the site are <br /> TPHg 0 9 mg/1 in well MW-6S m June 1990 <br /> Benzene 003 mg/l in well MW-4S in May 1990 <br /> Toluene 110 mg/l in well MW-4D un March 1990 <br /> Ethylbenzene 0042 mg/1 in well MW-6S in June 1990 <br /> Xylenes 021 mg/l in well MW-6S in June 1990 <br /> In general the maximum concentrations reported for TPHg and BTEX were within the first <br /> three months after well installation TPHg and BTEX were not detected in the September <br /> ' 1995 groundwater samples from monitoring wells MW-10,MW-11,and MW-12 <br /> A summary of the historical groundwater sampling results and the September 1995 sampling <br /> results are summarized on Table 2 Laboratory reports,field sampling sheets and chain-of- <br /> custody forms for the last two rounds of groundwater sampling in May and September 1995 <br /> are in Appendix B <br /> 1 <br /> ' 9537001 801 (3/4/96) Golder Associates <br />