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B1aes Environmental Management Inc 2nd Qtr 2004 Groundwater Momtonng Report
<br /> 002-70950-04 U-haul#709-50
<br />' not collect groundwater samples from the Former Harry's Auto Mart during the same period that Blaes
<br /> collected groundwater samples at the U-Haul facility, no comparison will be made between the two sites
<br /> I using analytical results from this quarter The highest concentrations of hydrocarbons in groundwater at
<br /> the U-Haul site are from wells MW-3B and MW-4B Concentrations of Benzene and 1,2 DCA were
<br /> below laboratory reporting limits in U-Haul's groundwater samples from monitor wells MW-5B, MW-
<br /> 8B, MW-IOB, MW-11B, and MW-12B Concentration contours and the approximate extent of Benzene
<br /> and 1,2 DCA for the "B" horizon are presented in Figures 4 and 5, respectively Analytical results are
<br /> summarized in Table 3
<br /> Analytical 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 MW4C Concentrations of Benzene and 1,2 DCA were below laboratory reporting limits in
<br /> U-Haul's groundwater samples from monitor well MW-5C, MW-IOC, MW-I1C, and MW-12C
<br /> Concentration contours and the approximate extent of Benzene and 1,2 DCA for the "C" horizon are
<br /> presented in Figures 6 and 7, respectively Analytical results are summarized in Table 3
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<br /> The laboratory analysis for fuel additives (MTBE, TBA, DIPE, ETBE, TAME, 1,1-DCA, 1,2-DCA, and
<br /> EDB) yielded concentrations above laboratory reporting limits in samples from wells MW-IB, MC-IC,
<br /> MW-2C, MW-3B, MW-4B, MW-4C, MW-6B, MW-6C, MW-7C, MW-8C, and MW-9B 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, n-Butylbenzene, Methylene Chloride, 1,2 DCA, 1,2,4-
<br /> Trimethylbenzene, and 1,3,5-Trimethylbenzene, Isopropylbenzene n-propylbenzene, and Naphthalene
<br /> Refer to the analytical report included in Appendix C for details
<br /> Based on the May 2004 analytical results, there appears to be limited communication between the "B"
<br /> and "C" horizons The LNAPL such as TPH and BTEX, appears to be concentrated in the "B" horizon
<br /> while the heavier DNAPL such as 1,2 DCA, has penetrated more extensively into the "C"horizon
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