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I Blaes Environmental Management Inc 2nd Qtr 2004 Groundwater Monitoring Report <br /> 002-70950-04 U-Haul#709-50 <br /> I <br />' 4 0 CONCLUSIONS <br /> IBlaes Environmental conducted the groundwater monitoring and sampling event for the Second Quarter <br /> 2004 at U-Haul Facility #709-50 in Stockton, California on May 24 through 27, 2004 Average <br /> groundwater levels recorded in May 2004 were approximately one foot higher than those recorded during <br /> the December 2003 monitoring event Groundwater was not encountered in the "A" horizon <br /> Based on the groundwater level measurements from the middle "B" <br /> wells and the Former Harry's Auto <br /> Mart monitoring wells, the groundwater surface map for May 2004 indicates a flow direction toward the <br /> northwest <br /> Analytical results of groundwater samples collected in May 2004 from both `B" and "C" casing wells <br /> indicated the presence of hydrocarbons in groundwater beneath the U-Haul Facility Comparison of <br /> analytical results from groundwater samples between U-Haul and the Former Harry's Auto Mart is <br /> unavailable this quarter due to the inability of GZA to sample during the same time period as Blaes <br /> Results of samples collected from the "B" casing wells revealed that the main portion of the U-Haul <br /> hydrocarbon plume is located around wells MW-2B, MW 3B, and MW-4B ResuIts of samples collected <br /> from the "C" casing wells revealed higher hydrocarbon concentrations near wells MW-2C and MW-4C <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 <br /> 11 <br /> I <br />