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Blaen Environmental Management Inc U Haul#709 50 <br /> 002-70950-04 2'Qtr 2003 Groundwater Monitoring Report <br /> 6,27103 <br /> tert-butyl ether (ETBE), and tert-amyl methyl ether (TAME), 1,2-Dzchloroethane (1,2 DCA), and 1,2 <br /> • Dibromoethane (EDB) according to EPA Method 8260 (full list) <br /> 3 3 GROUNDWATER ANALYTICAL RESULTS —MAY 2003 <br /> Laboratory analytical results for the May 2003 groundwater sampling event, which included two sample <br /> 1 groups (middle and lower casing samples), revealed substantial variation between the two groups A <br /> summary of the analytical results for the May 2003 sampling event is presented in Table 3 A copy of <br /> the corresponding laboratory analytical report and chain-of-custody documentation is provided in <br /> Appendix C <br /> 1 <br /> Analytical results of groundwater samples collected from the well casings screened across the <br /> groundwater interface (middle `B" casings) revealed two co-mingled plumes of dissolved phase <br /> 1 hydrocarbons beneath the U-Haul site and the Former Harry's Auto Mart Facility The highest <br /> concentrations of hydrocarbons in groundwater at the U-Haul site are from wells MW-2B and MW-4B, <br /> and the highest concentrations at the Former Harry's Auto Mart are from HA MW-I Benzene <br /> concentrations were below laboratory reporting limits in U-Haul's groundwater samples from monitor <br /> wells MW-5B, MW-8A, MW-10B, MW-11B, and MW-12B Concentrations of 1,2 DCA were below <br /> laboratory reporting limits in U-Haul's groundwater samples from monitor wells MW-5B, MW-8A, <br /> MW-10B, MW-11B, and MW-12B Concentration contours and the approximate extent of TPH, <br /> Benzene, and 1,2 DCA for the "B" horizon are presented to Figures 7, 8, and 9, respectively Analytical <br /> 1 <br /> results are summarized in Table 3 <br /> Analytical results of groundwater samples collected from the lower "C" casing wells, screened between <br /> r approximately 60 and 100 feet bgs, revealed the highest concentration of hydrocarbons to be located <br /> around well MW-4C All other "C" casing wells reported hydrocarbon concentrations below 1,000 gg/L <br /> TPHg, or below laboratory detection limits Concentration contours and the approximate extent of TPH, <br /> Benzene, and 1,2 DCA for the "C" horizon are presented in Figures 10, 11, and 12, respectively <br /> Analytical results are summarized in Table 3 <br /> 9 <br /> i <br />