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' 014009 Environmental Management Inc 1 St Qtr 2005 Groundwater Monttonng Report 002-70950-04 U-Haul#709-50 . 4.0 CONCLUSIONS BIaes Environmental conducted the groundwater monitoring and sampling event for the First Quarter ' 2005 at U-Haul Facility #709-50 in Stockton, California on March 14, I5, and 16, 2005 Average groundwater levels recorded in March 2005 were approximately five feet higher than those recorded ' during the December 2004 monitoring event Groundwater was not encountered in the "A" horizon ' Based on the groundwater level measurements from U-Haul's middle "B casing" wells the groundwater surface map for March 2005 indicates a relatively flat gradient across the site with a flow direction to the northeast ' Analytical results of groundwater samples collected in March 2005 from both "B" and "C" casing wells indicated the presence of hydrocarbons in groundwater beneath the U-Haul Facility Comparison of ' analytical results from groundwater samples between U-Haul and the Former Harry's Auto Mart indicates two co-mingled plumes across the sites Analytical results of groundwater samples collected ' from the "B" casing wells revealed that the main portion of the U-Haul hydrocarbon plume is located around wells MW-2B, MW-3B, and MW-4B while the plume across the Former Harry's Auto site is ' centered around their well MW-1 Analytical results of groundwater samples collected from the "C" casing wells revealed higher hydrocarbon concentrations near wells U-Haul wells MW-2C, MW-4C, and MW-6C and Harry's Auto well MW-ID Based on the December 2004 analytical results, there appears to be limited communication between the `B" and "C" horizons The LNAPL such as TPH and BTEX, appears to be concentrated in the "B"horizon while the heavier DNAPL such as 1,2 DCA, has penetrated ' more extensively into the "C"horizon 1 ' 9 1