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i - i31 August 2000 AGE Protect No 96-0232 iPage 15 of 25 i effluent water sample was obtained on that day to verify efficiency of the treatment system TPH-g, BTEX compounds, MTBE and TBA were all below laboratory detection levels in this sample i The system was fully operational on 20 June 2000, grab water samples were collected from the Influent and effluent of the pump and treat system Analysis of influent water samples detected TPH-g at concentrations of 23,000,ug/l, concentrations of MTBE at 52,000,ug/1 and minor detection i o f BTEX compounds Analysis of effluent water samples did not detect any of the constituents of concern above laboratory detection levels i The second round of influent/effluent monitoring samples were collected on 05 July 2000, relative to the 20 June 2000 Influent samples, TPH-g levels dropped from 23,000 µg/1 to 5,500 ,ug/1 and MTBE levels decreased from 52,000 µg/l to 38,000 ug/1 TBA and TAME were detected in the iinfluent water sample at concentrations of 13,000 µg/1 and 620 µg/l, respectively Effluent and intermediate samples were also obtained on 05 July 2000 The effluent and intermediate samples were obtained to verify that the treatment system continued to meet discharge levels and the intermediate samples were taken to check for any unforseen media break through Analysis of effluent water samples did not detect any of the constituents of concern above laboratory detection lie levels A summary of analytical data and laboratory reports are included with Appendix J I42 CLEAN-UP GOALS Based on our experience at similar sites, AGE believes that the proposed remedial activities will be the most effective available and practical remedial method However, cleanup goals approaching maximum contaminant levels (MCLs)are not realistic nor reasonable We propose to implement the "pump and treat"system until the point of dunmshmg return is achieved,which is proposed as when the resulting concentrations vary less than 10% for six consecutive months Upon approaching this "asymptotic" condition, a rebound test will be performed at the site by shutting the system off for approximately one to two weeks and immediately collect a sample from the influent upon re-, initiation of the unit The results of the "rebound" concentrations for TPH-g, TPH-d, BTEX and MTBE should be less than or equal to 25%of their respective concentrations obtained from the most recent influent sampling event At this time, AGE will re-evaluate the cost effectiveness of the remediation system and make recommendations to the RWQCB AGE believes that the above referenced cleanup goals are conditional upon identifying and removing the petroleum hydrocarbon and MTBE source(s), demonstrating plume stabilization and mass reduction Annexation efforts into the San Joaquin Count Utility Maintenance District are currently being q Y Y organized by the Bokides Family Limited Partnership for the Rocky's Restaurant and the Three B's Truck Plaza Upon being annexed into the San Joaquin County Utility Maintenance District, efforts will be made to supply the Rocky's Restaurant and the Three B's Truck Plaza with an alternate water Isource and to properly abandon the domestic water wells identified as RDW-1 and DW-1 AGE Advanced GcoEnvironmental,Inc i