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Mr. Mike Whelan <br /> ARCO Products Company <br /> February 14, 1997 <br /> Page 2 <br /> January 26, 1997 <br /> Dissolved phase gasoline, BTEX, MTBE and VOCs were not reported above laboratory <br /> MDU in the groundwater samples collected from the three monitoring wells purged and <br /> sampled during this monitoring episode. <br /> A summary of the analytical results obtained is presented in Table 1. For comparison <br /> purposes, the results of previous analyses are presented with the current results. <br /> The laboratory method blanks contained nondetect concentrations of gasoline,BTEX,MTBE <br /> and VOCs. Review of laboratory QA/QC data did not identify laboratory methodology <br /> errors that would have affected analyses performed. <br /> Data-Appendices <br /> Field protocol followed by SECOR staff during purging and sampling operations is included <br /> as Appendix A. The Chain-of-Custody Records for the water samples collected and analyzed <br /> are included as Appendix B. The laboratory data sheets are included as Appendix C. <br /> SECOR water sample field data sheets are included as Appendix D. <br /> Summary <br /> Analytical data obtained from the two monitoring episodes appears to show that groundwater <br /> beneath the facility has not been impacted by petroleum fuel hydrocarbons or volatile organic <br /> compounds. This is evidenced by two sampling episodes exhibiting nondetect concentrations <br /> of VFHs, BTEX, MTBE and VOCs. <br /> When the three wells were installed in November 1996, trace concentrations of petroleum <br /> fuel hydrocarbons in the C16-C40 range were identified in groundwater at the location of <br /> MW-1. Trace concentrations of gasoline and BTEX were also identified in groundwater at <br /> the location of monitoring well MW-2. Chemical analysis of the groundwater sample <br /> collected initially in November 1996 from MW-2 following EPA Test Method 8260,however, <br /> failed to indicate the presence of ethylbenzene above laboratory MDL.s of 2.0 micrograms <br /> per liter (µg/L). This compound was reported at a concentration of 15 µg/L by the <br /> laboratory using EPA Test Method 8020. Benzene and total xylenes, reported at 1.6µg/L <br /> and 1.3µg/L by the laboratory using Test Method 8020, were below the laboratory MDL of <br /> 2.0 Ag/L for these compounds using Test Method 8260. <br /> IN 40007-097-01 <br /> LHG:WP:97-071eb\a-maeteagwm <br />