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I i i %5 Former Discovery Chevrolet September 26, 1995 in well MW-3. These data have been used to construct a TPHg/BenzenelTPHd Concentration Map (Figure 4). Disposition of Well Purge Water Purge water generated during the third quarter 1995 sampling of groundwater monitoring wells MW-1 through MW-3 was discharged to properly labelled drums and stored at the site pending disposal. j i DISCUSSION AND CONCLUSIONS During the third quarter 1995 depth-to-groundwater measurements dropped approximately 0.81 to 0.96 feet from water levels measured during the second quarter 1995. During the third quarter 1995 groundwater appeared to flow toward the south-southeast under a gradient of 0.003. This flow direction is opposite of the flow direction indicated by historical monitoring data. TPHg and benzene were detected upgradient (well MW-1) and downgradient (well MW-2) of the former gasoline USTs. Petroleum hydrocarbons were not detected downgradient of the former waste oil UST (well MW-3). O&G has not been detected in groundwater samples 'J from well MW-3 for four consecutive sampling events. From second quarter to third quarter 1995 hydrocarbon concentrations increased in well MW-1 and decreased in well MW-2. I NEXT QUARTER'S PLANNED ACTIVITIES Activities planned for the fourth quarter 1995 at the subject site include: • Submitting a Work Plan to the SJCEHD for the removal of hydrocarbon-impacted soil and backfill material from the former UST pit and the installation of additional on-site groundwater monitoring wells. E • Implementing the scope of work outlined in the Work PIan • Monitoring, purging, and sampling all on-site groundwater monitoring wells. Groundwater samples from all on-site wells will be analyzed for TPHg and BTEX. In E addition, the groundwater sample from well MW-3 will also be analyzed for TPHg, TPHd, BTEX, and O&G. 8146.02-3 ¢ L