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' 07 January 2004.. AGE=NC Project No. 95-0106 . Page 3 of 4 _ 1,2-DCA was detected for the first time.ata concentration of 5.0 Ag/L in the ground water sample Icollected from MW-4. 'No adaitional analytes were detected at or.'above laboratory detection limits'in'wells MW=a and; I' MW-4. No:analytes were detected zit or above laboratory detection limits in-wells MW-2, MW-3, MW-4, MW-5', MW-6 '(Upper),-MW-6' (lower). and MW-7. Analytical results of groundwater' samples are SLIminarized in Table 2. The laboratory report.(CTEL'Project No, CT2.14-0309070), ' QA/QC and chain-of custody'are included in Appendix C, ; -4.0. SUMMARY AND CONCLUSIONS ' The following conclusions were drawn froin the'results•ofthe site investigation: • . was generally northward on 1.1 -September 2003, and. The ground water flow direction gradients were calculated to range from 0.005 feet/fee toward the northwest to 0.005 feet/feet toward the northeast.-Groundwater elevations increased slightly but continue to flow in a northerly direction. ' . TPH-g was detected in ground water.samples from monitoring well.MW-4, located down= gradient off-site from the former,UST excavation, and well MW-1 located just north of the former.UST area. , • BTEX compounds were detected in the water samples collected from MW-1 and MW-4. The concentrations. of benzenc.,in the samples exceeds the State of California maximum ' contaminant levcl,(MCL),f6i drinking water.' _ • MTBE was detected'in the.water sample collected from MW-1; the concentration detected exceeds the secondary MCL for MTBE in drinking water: ' •• 1,2-DCA was detected for the first time in the ground water sample collected from MW-1; the concentration of 1,2,-DCA exceeds the-MCL for drinking water. ' 5.0. RECOMMENDATIONS'- Based on this and previous site investigations; AGE recorrimends continued quarterly-monitoring. of the well network. The'fourth giiarter'monitoring event_was preformed-in December 2003. AGE is also prepafing a report of findings related to.nine soil borings advanced on- and off-site ; during the'third 4uarter,2003; for further vertical and lateral soil and ground water impact definition: '�• AGE antiipates a ilial report during'the first quarter 2004: ' I 'Advanced Geo Environmental,Inc.