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IMA <br /> Working To Restore Nature <br /> Groundwater well purge and sample logs are provided in Appendix A <br /> RESULTS OF LABORATORY ANALYSES <br /> ' Water samples collected from wells MW-1, MW-2, and MW-6 were analyzed for TPHg, TPHd, <br /> and BTEX using modified EPA methods 801518020. These results and cumulative results of <br /> ' laboratory analyses are summarized in Table 1 The Chain of Custody Record and laboratory <br /> analytical reports are included in Appendix B <br /> ' Results of this quarter's laboratory analyses of water samples from wells MW-1, MW-2, and <br /> MW-6 indicate the following: <br /> • In well MW-1, the concentrations of BTEX, TPHg and TPHd decreased to nondetectable <br /> since the previous monitoring episode in December 1993 <br /> • The concentrations of BTEX, TPHg and TPHd remained nondetectable in well MW-2 <br /> ' 0 The concentrations of benzene, toluene, and total xylenes in well MW-6 increased from <br /> nondetectable to 1 1 parts per billion (ppb), 0 59 ppb, and 0 71 ppb, respectively The <br /> concentrations of TPHg and TPHd in well MW-6 continue to remain nondetectable. <br /> CONCLUSIONS <br /> ' Based on the results of this quarterly monitoring and previous work performed at the site, <br /> RESNA concludes that the TPHg and TPHd concentrations have decreased or remained the <br /> same, and BTEX concentrations in groundwater have increased slightly, decreased or remained <br /> ' the same since the last monitoring episode in December 1993 The concentrations detected in <br /> the wells sampled are consistent with historical patterns <br /> RECOMMENDATIONS <br /> Based upon the findings and conclusions of this and previous groundwater monitoring episodes, <br /> ' RESNA recommends continued quarterly monitoring consisting of measuring water levels in <br /> wells MW-1 through MW-6 and collecting samples from wells MW-1, MW-2, and MW-6 <br /> Water samples collected during monitoring should be submitted for laboratory analysis of TPHg, <br /> TPHd, and BTEX using EPA methods 8015/8020 <br /> SCHEDULE <br /> The next quarterly monitoring episode is scheduled for June 1994 with the quarterly monitoring <br /> report submitted in July 1994 Routine well maintenance and inspection will be performed as <br /> necessary during site visits <br /> -UW56\QUART1.Y11QMR1994 FNL 3 <br /> 1 <br />