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I k I 27 Jul 2001 Y ' AGE-NC Project No 95-0184 Page 3 of 4 ' 3 2 ANALYTICAL RESULTS OF WATER SAMPLES TPH-g was detected in all of the sampled monitoring wells at concentrations ranging from 82 ' micrograms per liter(µg11) in MW-7 to 170,000 µg/1 in VW-2B TPH-d was detected in the sample from MW-4 at a concentration of 2,700 µg/1 ' All of the BTEX compounds were detected in the ground water samples analyzed benzene concentrations ranged from 2 1 µg/l(MW-7)to 34,000µg/1(VW-2B),toluene concentrations ranged ' from 0 84µg/1(MW-7)to 31,000µg/1(VW-5B),ethylbenzene concentrations ranged from 0 66µg/1 (MW-7) to 3,600 µg/1 (VW-2B), and xylenes concentrations ranged from 0 81 µg/1 (MW-7)-to 19,000 µg/1 (VW-5B) ' None of the oxygenated volatile organics, including MTBE,were detected at concentrations above laboratory reporting limits during the June 2001 monitoring event 1,2-Dichloroethane (DCA)was ' detected in samples MW-4(840 µg/1) and VW-2B(1,400 µg/]) Seven additional constituents were detected by EPA Method 8260 at concentrations as high as 3,200 ppb (1,2,4-tnmethylbenzene, VW-5B) Analytical results of ground water samples are summarized on Tables 2 and 3 Copies of the laboratoryreport(MAI Laboratory ID 69658-69667)and chain-of-custody forms are in Appendix B 1 4.0. SUMMARY AND CONCLUSIONS ' Based upon data collected from the site, AGE concludes the following ' Ground water levels were as high as approximately 24 feet above the screened intervals of all the monitoring wells The ground water gradient ranged widely,from 0 067 ft/ft along the northern edge of the site to 0 009 ft/ft down the ground water nose at the north end of the ' property The ground water flow direction varies from nearly north along the north limb of a ground water nose at the northern part of the property, to approximately east-southeast ' along the southern limb, the flow direction south of this ground water nose is generally northeast + Detectable concentrations of TPH-g as well as all BTEX compounds were found in all of the ' ground water wells sampled, all ground water samples contained one or more analytes at concentrations above California's Maximum Contaminant Levels (MCLS) ' • No free product was measured during this sampling event,however,the majority of the well screens are drowned and are not likely to produce direct evidence of free product 1 Advanced GeoE nvi ron mental,Inc 1