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' First quarter 1999 Monitoring and Sampling Report and Closure Abstract 3 <br /> The Southland Corporation,Store No 17334,4541 North Pershing Avenue,Stockton,CA —_aril 15,1999 <br /> Dissolved MTBE concentrations have declined to non-detectable in well MW-513 from last quarter's <br /> 1,480 pg/t_level Concentrations of MTBE in source area well MW-5A have declined by about 70% <br /> since the fourth quarter of 1998 Concentrations of MTBE have remained stable in downgradient <br /> ' well MW-4 <br /> ' Purgewater Disposal <br /> All purgewater generated during this quarterly monitoring and sampling event was stored in <br /> 55-gallon Department of Transportation (DOT)-approved drums Purge water generated during <br /> this sampling event will be transported from the site during the next quarter by Belshire <br /> Environmental Services, Inc to DeMenno Kerdoon in Compton,California for treatment and <br /> disposal Waste disposal documentation will be forwarded once received <br /> ' Closure Abstract <br /> Hydrocarbon concentration reductions in the former source area(the former underground storage <br /> tank pit)indicate that intrinsic biodegradation combined with removal of the underground storage <br /> tanks in 1998 are successfully remediating the hydrocarbon plume Further reductions in <br /> downgradient dissolved hydrocarbon levels Cncluding MTBE) are expected <br /> If dissolved hydrocarbon concentrations continue to exhibit downward trends,site closure will be <br /> ' requested from the San Joaquin County Health Services/Environmental Health Department during <br /> the fourth quarter of 1999(or four quarters after removal of the underground storage tanks at the <br /> referenced site) <br /> 1 <br /> 1 <br /> 1 <br /> 1733484 wpd <br /> i <br /> 1 <br /> 1 <br />