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' 13141e8 Environmental Management Inc 3rd Qtr 2005 Groundwater Momtonng Report <br /> 002-70950-05 U-Haul#709-50 <br /> • <br /> 4 0 CONCLUSIONS <br /> Blaes Environmental conducted the groundwater monitoring and sampling event for the third quarter <br /> 2005 at U-Haul Facility #709-50 in Stockton, California on August 29, 30, and 31, 2005 Average <br /> groundwater levels recorded in August 2005 were approximately nine feet lower than those recorded <br /> during the June 2005 monitoring event Groundwater was not encountered in the "A"horizon <br /> Based on the groundwater Ievel measurements from selected U-Haul "B casing" wells, the groundwater <br /> ' surface map for August 2005 indicates a relatively flat gradient across the site with a general flow <br /> direction to the north and northwest <br /> Analytical results of groundwater samples collected in August 2005 from both "B" and "C" casing wells <br /> 1 indicated the presence of hydrocarbons in groundwater beneath the U-Haul Facility Analytical results of <br /> groundwater 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 while the plume across the <br /> Former Harry's Auto site is centered around their well MW-1 Analytical results of groundwater samples <br /> collected from the "C" casing wells revealed higher hydrocarbon concentrations near U-Haul wells MW- <br /> 2C, MW-4C, MW-6C, and Harry's Auto well MW-ID Based on the August 2005 analytical results, <br /> there appears to be limited communication between the "B" and "C" horizons The LNAPLs such as <br /> TPH and BTEX, are generally concentrated in the "B" horizon while the heavier DNAPLs such as 1,2 <br /> DCA, has penetrated more extensively into the "C"horizon <br /> 9 <br />