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Plume boundary to the north is inferred, field observations and PID measurements of the soil <br /> 1 sample collected from boring SB-10 in the capillary fringe, and analytical data from the soil <br /> sample analyzed from that boring indicate that groundwater at that location is likely not impacted <br />' by petroleum hydrocarbons Groundwater analytical results are summarized in Table 2 <br /> 1 During subsurface investigations, floating product was encountered in borings SB-7 and SB-2 <br /> Floating product has been measured in well MW-2 during past monitoring events A sample of <br /> the floating product from well MW-2 was analyzed in January 1996 for a fuel fingerprint by <br /> Sequoia Analytical of Redwood City, California, and the product was identified as weathered <br />' diesel fuel (Smith Technology, May 1996) <br /> 1 INTERIM REMEDIAL ACTION MEASURE <br /> Based on the soil and groundwater data compiled for the site, Smith Technology recommends an <br />' interim remedial action measure be implemented at the site For interim remedial action, Snuth <br /> Technology proposes the installation of a passive skimmer in well MW-2, in addition to <br /> continuation of quarterly monitoring activities at the site A passive skimmer installed in well <br />' MW-2 will promote the removal of floating product which has been observed in the well In <br /> addition, the skimmer may remove the floating product observed in the vicinity of bonngs SB-2 <br />' and SB-7 Removal of floating product will aid the natural attenuation and biodegradation of <br /> petroleum hydrocarbons in groundwater beneath the site Initially, the proposed skimmer will be <br /> monitored biweekly in order to determine the quantity of floating product being collected in the <br /> skimmer A monthly monitoring schedule may be appropriate after the first month of monitoring <br /> 1 <br /> Free product removed from the skimmer will be stored on-site in a double containment drum <br /> 1 <br /> 1 <br /> w 194334VepoAslsumryMLdoc 7 <br /> • <br /> 1 <br /> SMTH <br />