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Blass Environmental Management Inc 3R°Qtr 2003 Groundwater Monitoring Report <br /> 002-70950-04 it-Haul#709-50 <br /> I <br /> IAnalytical results of y 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 /> 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-1 Concentrations of <br /> Benzene and 1,2 DCA were below laboratory reporting limits In U-Haul's groundwater samples from <br />! mnitor well MW-5B Groundwater monitoring wells MW-8A, MW-IOB, MW-IIB, and MW-12B <br /> were dry Concentration contours and the approximate extent of TPH, Benzene, and 1,2 DCA for the <br /> "B" horizon are presented in Figures 4, 5, and 6, respectively Analytical results are summarized to <br /> Table 3 <br /> IAnalytical results of groundwater samples collected from the lower "C" casing wells, screened between <br /> approximately 60 and 100 feet bgs, revealed the highest concentration of hydrocarbons to be located <br /> around well MW-4C Concentrations of Benzene and 1,2 DCA were below laboratory reporting limits In <br /> U-Haul's groundwater samples from monitor well MW-5C, 8C, IOC, 11C, and 12C Concentration <br />�. contours and the approximate extent of TPH, Benzene, and 1,2 DCA for the "C" horizon are presented to <br /> Figures 7, 8, and 9, respectively Analytical results are summarized in Table 3 <br /> The laboratory analysis of for fuel additives (MTBE, TBA, DIPE, ETBE, and TAME) yielded <br /> concentrations above laboratory reporting limits in samples from wells MW-lB and MW-7C Analytical <br /> results of the groundwater samples collected from wells MW-2B and MW-2C (analyzed by EPA Method <br /> 8260 full list) indicated detections of BTEX, 1,2,4-Trimethylbenzene, and 1,3,5-Tnmethylbenzene, <br /> Isopropylbenzene, and Naphthalene Refer to the analytical report included in Appendix C for details <br /> Based on the September 2003 analytical results, there appears to be limited communication between the <br /> "B" and "C" horizons The LNAPL such as TPH and BTEX, appears to be concentrated in the "B" <br /> horizon whale the heavier DNAPL such as 1,2 DCA, has penetrated more extensively into the "C" <br /> Ihorizon <br /> 9 <br /> 1 <br /> 1 <br />