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Di Salvo Trucking Report <br /> August 31 1995 <br /> Page 5 <br /> TABLE 1 <br /> Results of Analyses - DSI Salvo Trucking <br /> Lathrop, California <br /> TEPH <br /> B T E X Kerosene Diesel Motor Oil <br /> Detection 03 0 3 0 3 06 005 005 05 <br /> ISample ID Limits Ugll JLgll µg/l Ag/l mg/l mg/1 mg/l <br /> 1418-MWI-618195 ND ND ND ND ND 040 ND <br /> f1418-MWI-8116/95 ND ND ND ND ND 048 ND <br /> 1418-MWI-8122/95 ND ND ND ND ND ND ND <br />' Umt Co rstorn <br /> pg/kg parts per bdb—(ppb) B T E X —ber=m tu;> ethyl bemsm and xylem <br /> mg/kY parts per vulhon(ppm) TEPH tial extractabb peur le=hydromrbam quamtfxd as kcrosem djesel and motor oil <br /> ND—now detected at or above laboratory detettton tumt <br /> 5,0 CONCLUSIONS AND RECOMMENDATIONS <br />' Laboratory analyses detected 0 40 mg/1 diesel in the groundwater sample collected following <br /> installation of MWI Laboratory analyses detected 0 48 mg/l diesel in the groundwater sample <br /> collected following the removal of the pore water from a cylindrical area encompassing the east end <br /> of TK4 No evidence of hydrocarbon contamination was detected at or above the laboratory <br />' reported detection limits in the groundwater samples collected following removal of the pore water <br /> from a cylindrical area having a radius of approximately 23 6 feet from MW 1 <br />' The source(s) of hydrocarbon contamination (the UST's) have been removed from the Di <br /> Salvo - Lathrop site Laboratory analyses of groundwater samples collected from the site indicate <br />' that a plume of impacted groundwater extended a distance of at least 11 6 feet but less than 23 6 <br /> feet from MW 1 The absence of hydrocarbon contamination in the Autust 22, 1995, groundwater <br />' sample collected from MWI suggests contamination initially detected in MWI may have been from <br /> the former east end of TK4 located approximately 10 feet up-gradient from MWI Laboratory <br /> analyses indicate that the removal of pore water a distance of approximately 23 6 feet from MWI <br />' has removed groundwater contamination detected in previous groundwater samples collected from <br /> MWI <br />' Based on the findings from this and previous investigations, Condor recommends 1 additional <br /> g P <br />' quarterly groundwater sampling event at the site Based on the findings from the <br /> next proposed quarterly sampling event, Condor will recommend no further action at the site or <br /> additional monitoring <br />' �� CONDOR <br />