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' $laes Envirownental Management Inc U Haulr#709 50 <br /> 042 70950 04 Groundwater Monitonng Report <br /> 1123103 <br /> ' 4 0 CONCLUSIONS <br /> ' Blaes Environmental conducted the groundwater monitoring and sampling event for the fourth quarter of <br /> 2002 at U-Haul facility #709-50 in Stockton, California on December 3-5, 2002 Average groundwater <br /> ' levels recorded in December 2002 were approximately 5 feet higher than those recorded during the <br /> September 2002 monitoring event Based on the groundwater level measurements from both "B" and <br /> ' "C" casing wells, the groundwater surface map for December 2002 indicates a very slight flow gradient <br /> toward the west <br /> ' Analytical results ofoundwater samples colt " <br /> t�' p collected in December 2002 from both B and C„ casing <br /> ' wells indicated the presence of hydrocarbons in groundwater Results of samples collected from the "B” <br /> casing wells revealed that the main portion of the hydrocarbon plume (benzene concentrations greater <br /> ' than 10,000 gg/L) is located around wells MW-2B, MW 3B, and MW-4B Results of samples collected <br /> from the "C" casing wells revealed higher hydrocarbon concentrations near wells MW-2C and MW-4C <br /> Groundwater samples from neither the "B" nor "C" casing wells were found to have reportable levels of <br /> fuel additives <br /> 1 <br /> 9 <br />