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First Quarter 1999 Monitoring and Sampling Report 2 The Southland Corporation-Store#20632,4627 DaVina Drive,Stockton,CA March 19, 1999 sampling event and historical monitoring results are presented in Table 1 and 2 (Attachment 2) Field data sheets are included in Attachment 3 Monitoring Well Sampling and Analytical Results ' On February 17, 1999,groundwater samples were collected from four site related monitoring wells Before sampling, at least 4 well casing volumes of groundwater was removed from each monitoring well unless the well was purged dry The groundwater samples were collected using disposable bailers Groundwater samples were placed in analysis-specific containers with analysis-specific preservative The samples were then sealed using Teflon septum caps, labeled with the fob identification number,the ' sample number,date,time, and type of laboratory analysis required The samples were stored on ice and transported under a chain-of-custody record to state-certified Acculabs Inc , in Davis, California Groundwater samples were analyzed for BTEX and TPH-G using Environmental Protection Agency (EPA) methods 8020/modified 8015, and for oxygenates MTBE, TBA, DIPE, ETBE, and TAME using EPA method 8260 ' Historical and Laboratory analytical results for groundwater samples collected on February 17, 1999 are presented In Table 1 Dissolved benzene was detected in one well,MW-5, above method reporting limits (MRL) at 85 micrograms per liter (ug/L) Highest dissolved TPH-G and MTBE concentrations were reported in well MW-2 at 770 ug/L and 4,900 ug/L, respectively Since October of 1997, BTEX concentrations in the downgradient well (MW-2) remained below detection limits while hydrocarbons in the upgradient well (MW-1) have dropped to non-detectable levels and MTBE concentrations remain very ' low to non-detectable In cross gradient well MW-3, benzene, TPH-G and MTBE concentrations have declined below method detection limits Overall, reduced hydrocarbon concentrations found in monitoring wells at the plume periphery documents that the hydrocarbon plume is stable and in a general state of ' attenuation Laboratory analytical reports for the groundwater samples are Included in Attachment 4 Purge Water Transportation and Disposal All purge water generated during this quarterly monitoring and sampling event was stored in 55-gallon ' Department of Transportation (DOT)-approved drums pending characterization and proper disposal Approximately 25 gallons of purge water generated during this sampling event wilt be removed from the site during the second quarter by Belshire Environmental Services, Inc and later transported by Nieto & ' Sons to DeMenno Kerdoon in Compton, California for treatment and disposal 20632g1 rpt IT CORPORATION