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1 i <br /> Fourth Quarter 1992 Momtonng Report <br /> Coca-Cala Enterpnses- West <br /> ' February 10, 1993 <br /> Page 4 <br /> ' • Concentrations of TPHG, TPHD, and BTEX continue to remain nondetectable in <br /> downgradient well MW-6 <br /> CONCLUSIONS <br /> Based on the results of this quarterly monitoring and previous work performed at the site, <br /> RESNA concludes that the TPHG, TPHD, and BTEX concentrations in groundwater have <br /> remained about the same order of magnitude since the last monitoring episode in November <br /> 1991 The majority of gasoline hydrocarbons have been consistently detected in the vicinity <br /> directly downgradient from the former tank pit (in well MW-1). Wells MW-2 and MW-6 <br /> located cross-gradient and downgradient from the former tank pit cavity, respectively, contained <br /> nondetectable concentrations of TPHG, TPHD, and BTEX suggesting little or no migration of <br /> gasoline hydrocarbons in groundwater. <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 <br /> TPHG, TPHD, and BTEX using EPA methods 50301801518020 <br /> ' SCHEDULE <br /> The next quarterly monitoring episode is scheduled for March 1993 with the quarterly <br /> ' monitoring report submitted about April 1993 Routine well maintenance and inspection will <br /> be performed as necessary during site visits <br /> ' DISTRIBUTION <br /> ' It is recommended that copies of this report should be forwarded to the following regulatory <br /> agencies involved in this project <br /> ' 4QMR1992 FNL <br /> 1 <br />