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I Blaes Environmental Management Inc 3RD Qtr 2003 Groundwater Monitoring Report 002-70950-04 U-Haul#709-50 I S4.0 CONCLUSIONS Blaes Environmental conducted the groundwater monitoring and sampling event for the Third Quarter 2003 at U-Haul Facility #709-50 in Stockton, California on September 8 through 11, 2003 Average groundwater levels recorded in September 2003 were more than 10 feet lower than those recorded during the May 2003 monitoring event Groundwater was not encountered in the "A"horizon I Based on theoundwater level measurements from the middle "B" w ' gr ells and the Farmer Harry's Auto Mart monitoring wells, the groundwater surface map for September 2003 indicates a flow direction toward the southeast across the northern portion of the site and a flow direction radiating southwest to northwest from a high point centered near the southern part of the intersection of Wilson Way and Sangumetti Lane across the southern portion of the site Analytical results of groundwater samples collected in September 2003 from both "B" and "C" casing wells indicated the presence of hydrocarbons in groundwater beneath both the U-Haul Facility and the Former Harry's Auto Mart Facility Results of 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 The main portion of the Farmer Harry's Auto hydrocarbon plume is located beneath HA MW-1 I Results of samples collected from the "C" casing wells revealed higher hydrocarbon concentrations near wells MW-2C and MW-4C Based on the September 2003 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 I I I 11 I