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T. CSUS-Multi Campus Regional Center—Quarterly Groundwater Monitoring April 8,2003 Page 2 Table 1 Summary of March 2003 Quarterly Groundwater Monitoring Results t Field Activity Number of groundwater wells 3 Number of groundwater wells sampled . 3 Number of groundwater wells 3 Date monitored 3113103 measured for water level Site Hydrology Approximate average depth to 38.90 feet Average increase(+)/decrease H in +0.93 groundwater dFptbs to groundwater since last sampling feet. Approximate flow direction Southeast Groundwater Contamination Wells containing free product None Wells with odor noted 2 Number of wells with no detectable 1 Number of wells with concentrations at or 2 petroleum hydrocarbons above MCLS Maximum Concentration: Benzene Benzene(gg/L) 8.6 Toluene Toluene(pg/L) 1.7' Ethyl benzene Ethyl benzene(gg/L) 5.6' Xylenes Xylenes(µg/L) 12 Nature of contamination: MTBE MTBE(µg/L) 85 1,2-DCA 1,2-DCA(gg/L) 4l TPH-G TPH-G(gg/L) 930 TPH-D TPH-D(gg(L) 230" TPH-MO TPH-MO 01g/L) 550 FIELD OBSERVATIONS "On March 13, 2003, a Condor representative was" on site to make field observations at the three monitoring wells, MW-1, MW-2, and MW-3, as part of the first quarter 2003 quarterly groundwater monitoring event. Field observations included appearance of samples (color, clarity, and presence of petroleum product sheen or phase in samples), collection of water quality field parameters, and water "level measurement. No separate phase petroleum or sheen was noted in the groundwater recovered from the wells. A slight petroleum odor was noted in the groundwater recovered from both MW-2 and MW-3. Field observations are included in the groundwater monitoring field forms, attached. j ,i GROUNDWATER ELEVATIONS AND GRADIENT On March 13, 2003, the depth to groundwater was measured in monitor wells MW-1, MW-2, and MW-3. Groundwater elevation data is presented in Table 2, on the following page. The average depth to groundwater in the monitor wells was approximately 38.90 feet below the surveyed well collar measuring points (the measuring points are slightly below the ground surface). The average groundwater elevation measured in the monitoring wells decreased approximately 0.93 feet between December 27, 2002; and March 13,2003. The estimated groundwater gradient for the site on March 13, 2003, was 0.0016 ft/ft to the southeast and is shown in Figure 2, attached. �� CONDOR"