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Biaes Emrraunenlal Afarragcnterrt Etc U-Haul#709-50 002-70950-04 Groundwater Monitoring Report 03/27/02 4 0 CONCLUSIONS Blaes EllvllOnmental conducted a groundwater monitoring and sampling event at U-Haul facility #709-50 on March 4, 5, and 6, 2002 In general, groundwater levels in March 2002 rose approximately three feet since December 2001 Based on the groundwater level measurements from the middle "B" well casings, the groundwater surface map for March 2002 indicated a slight flow gradient toward the east The highest groundwater elevation from the middle "B" well casings was measured in monitor well MW-6B Groundwater level measurements from the lower"C" well casings indicated a relative groundwater low at monitor wells MW-1C, MW-2C and MW-5C and a relative high at monitor well MW-6C, MW-7C and MW-8C Although groundwater on the U-Haul property is relatively flat, the general flow gradient in the "C" casing wells appears to be toward the east Analytical results of groundwater samples collected in March 2002 from the middle "B" and lower "C" well casings both indicated the presence of hydrocarbons in groundwater Results of samples collected fiom the middle "B" well casings revealed that the main portion of the hydrocarbon plume (with benzene concentrations greater than 1,000 pig/L) includes wells MW-313, MW-2B and MW-413 Results of samples collected from the lower "C" well casings revealed that elevated concentrations of hydrocarbons exist near wells MW-4C, MW-6C and MW-7C Two wells are located on the eastern and western property boundaries, respectively The third, MW-7C is outside the site boundary, south of MW-4C Despite the detection of hydrocarbons in wells MW-4C and MW-6C, the central portion of the site (in the "C" depth range) near wells MW-2C and MW-3C did not contain detectable concentrations of TPHg or benzene in groundwater during this sampling event Variances between the results of this sampling event compared with the December 2001 sampling event include an apparent reversal of groundwater flow direction from west to east and a drop in benzene detected in the sample from well MW-6C (from 2,900 gg/L to 7 6 p.g/L) S9