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1 <br /> Working To Restore Nature <br /> RESULTS OF LABORATORY ANALYSES <br /> Water samples collected from wells MW-1 through MW-6 were analyzed for TPHg, TPHd, and <br /> BTEX using modified EPA methods 8015/8020 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 through MW-6 <br /> indicate the following <br /> • Concentrations of BTEX and TPHg were nondetectable to all wells <br /> 0 Concentrations of TPHd were detected in wells MW-3 and MW4 only <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 decreased or remained the same since the <br /> last monitoring episode in March 1994 The concentrations detected in the wells sampled are <br /> consistent with histoncal patterns <br /> RECOMMENDATIONS <br /> Based upon the findings and conclusions of this andP revious groundwater monitoring episodes, <br /> RESNA proposes a reduced monitoring frequency for wells MW-1 through MW-6 Given the <br /> ' low or non-detectable levels of petroleum hydrocarbon constituents present in groundwater <br /> RESNA feels that groundwater can be sufficiently monitored on a quarterly basis by measunng <br /> ' water levels in all wells but collecting samples only from wells MW-1, MW-3, and MW-4 <br /> These wells are located upgradient, downgradient and in the vicinity of the former gasoline UST. <br /> RESNA proposes to sample Wells MW-2, MW-5, and MW-6 dunng the first quarter only <br /> ' Water samples collected dunng monitonng should be submitted for laboratory analysis of TPHg, <br /> TPHd, and BTEX using EPA methods 8015/8020 The proposed monrtonng schedule is <br /> summanzed in Table 3 <br /> ' SCHEDULE <br /> ' The next quarterly monitoring episode is scheduled for September 1994 with the quarterly <br /> monitoring report submitted in October 1994 Routine well maintenance and inspection will be <br /> performed as necessary dunng site visits <br /> 5400551QUARTLYI2QMR19% DRF 3 <br /> 1 <br />