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Fust Quarter 1993 Monitonng Report <br /> Coca-Cola Enterpnses-West <br /> Project No 54006 02 <br /> Page 5 <br /> former tank pit (in well MW-1). Wells MW-2 and MW-6 located cross-gradient and <br /> downgradient from the former tank pit excavation, respectively, which previously contained <br /> nondetectable concentrations of TPHG, TPHD, and BTEX, contained detectable levels of <br /> 1 gasoline hydrocarbons This may be due to the wet seasonal conditions and the nse'm <br /> groundwater elevations <br />' The unrecorded facility well does not pose a threat as a potential conduit for the migration of <br /> contaminants from the shallow aquifer to deeper aquifers based on laboratory analytical results <br /> for the sample collected and the location of the well in relation to the former tank pit excavation. <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 5030/8015/8020. <br /> RESNA recommends that the facility well be destroyed by backfilling it with a pressurized, <br />' tremied mixture of neat cement and bentonite grout leaving the casing in place A well <br /> destruction permit should be prepared and submitted to SJCPHS for approval prior to well <br /> destruction. <br /> SCHEDULE <br /> The next quarterly monitoring episode is scheduled for June 1993 with the quarterly monitoring <br /> report submitted about July 1993 Routine well maintenance and inspection will be performed <br />' as necessary during site visits <br />' DISTRIBUTION <br /> Copies of this report will be forwarded to the following regulatory agencies involved in this <br />' project: <br />' 1QMRt993 FNL <br />