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Blaes Environmental Management Inc 2nd Qtr 2005 Groundwater Momtonng Report 002-70950-04 U-11aul#709-50 MW-4B The highest concentrations at the Former Harry's Auto Mart are from HA MW-1 Concentration contours and the approximate extent of Benzene and 1,2-DCA in groundwater for the "B" ' horizon are presented in Figures 5 and 6,respectively Analytical results are summarized in Table 3 ' Analytical results of groundwater samples collected from the lower "C" casing wells, screened between approximately 60 and 100 feet bgs, revealed the highest concentration of hydrocarbons to be located ' around well MW-4C (benzene) and MW-6C (1,2 DCA) Concentrations of Benzene and 1,2 DCA were below laboratory reporting limits in U-Haul's groundwater samples from monitor wells MW-5C, MW- 11C and MW-12C Concentration contours and the approximate extent of Benzene and 1,2-DCA for the "C"horizon are presented in Figures 7 and 8,respectively Analytical results are summarized in Table 3 The laboratory analysis of fuel additives MTBE, TBA, DIPE, ETBE, TAME, 1,1-DCA, 1,2-DCA, and EDB indicated concentrations above laboratory reporting limits in samples from wells MW-1B, MC-1C, MW-2B, MW-2C, MW-3B, MW-3C, MW4B, MW4C, MW-6B, MW-6C, MW-7C, MW-8B, MW-8C, ' MW-9B,MW-10B, and MW-10C Refer to the analytical report included in Appendix C for details . Based on the second quarter 2005 analytical results, there appears to be limited communication between the "B" and "C" horizons The light nonaqueous phase liquid (LNAPL) such as TPH and BTEX, are ' generally concentrated in the "B" horizon while the heavier dense nonaqueous phase liquid (DNAPL) such as 1,2 DCA,has penetrated more extensively into the"C" horizon 3 4 PURGE WATER TREATMENT AND DISPOSAL Groundwater purged during the second quarter of 2005 at the site was stored in a 1,000-gallon polyethylene tank located on the west side of the U-Haul building On June 27, 2005, Blaes ' Environmental subcontracted Integrated Wastestream Management, Inc (fWM)of Milpitas, California to pump the tank and transport the purged groundwater to an approved treatment facility for recycling The purged groundwater generated during the fourth quarter 2004, first quarter 2005, and second quarter ' 2005 groundwater monitoring events was removed from the site and recycled at Seaport Refining & Environmental in Redwood City, California on July 8, 2005 The certificate of recycling is presented as Appendix D 8