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Third Quarter 2005 Quarterly Groundwater Monitoring Report <br /> Stockton Center Site Authority—University Park <br /> October 18,2005 <br /> Page 2 of 6 <br /> Table 1 <br /> Summary of September 2005 Quarterly Groundwater Monitoring Results <br /> Field Activit <br /> Number of groundwater monitor wells 3 Number of monitor wells sampled 3 <br /> Monitor wells measured for water level 3 Date(s) monitored 09/01/05 <br /> Site Hydrology <br /> Average increase(+)/decrease(—)in -0.36 foot <br /> Average depth to groundwater 39.73 feet depths to groundwater since last (shallower) <br /> (May 2005)monitoring <br /> Approximate flow direction Northeast <br /> Groundwater Contamination <br /> Wells containing free product None Well(s)with odor noted MW-1,MW-2 <br /> Number of monitor wells with all of Number of monitor wells with any of <br /> benzene, 1,2-DCA, and MTBE 1 benzene, 1,2-DCA,and/or MTBE 2 <br /> concentrations below the MCLS concentrations at or above the MCLS <br /> Nature of contamination: Benzene <br /> Range of analyte concentrations detected in the wells: <br /> Ethyl Benzene(�tg/L): <0.5—31.6 <br /> benzene Ethyl benzene(µg/L): <0.5—26.1 <br /> Total Total Xylenes(pgfl: < 1.0—22.4 <br /> Xylenes MTBE(µg/L): <0.5—51.3 <br /> MTBE 1,2-DCA(pg/L): <0.5—41.8 <br /> 1,2-DCA TBA(µg/L): 5.0— 15.3 <br /> TBA TPH-G(pg/L): <50—699 <br /> TPH-G TPH-K(gglL):<250—333 <br /> TPH-K TPH-MO(pg/L): <500—724 <br /> TPH-MO TAME(µg/l-): <0.5— 1.0 <br /> TAME <br /> Additional Information <br /> BTEX were analyzed by EPA Method 8020. <br /> Gasoline oxygenates were analyzed by EPA Method 8260B <br /> Total petroleum hydrocarbons were analyzed by EPA Method 8015M. <br /> All wells were purged prior to sa lin . <br /> FIELD OBSERVATIONS <br /> On September 1, 2005, a Condor representative was on Site to make field observations at the three <br /> monitor wells, MW-1, MW-2, and MW-3, as part of the third quarter 2005 quarterly groundwater <br /> monitoring event. Field observations included appearance of samples (color, clarity, and presence of <br /> petroleum product sheen or phase in samples), collection of water quality field parameters, and water <br /> level measurement. <br /> No separate phase petroleum or sheen was noted in the groundwater recovered from the wells. The field <br /> inspection samples collected from monitor wells MW-1 and MW-2 were noted as having strong and <br /> slight hydrocarbon odors, respectively. Field observations are included in the groundwater monitoring <br /> field forms, attached. <br /> GROUNDWATER ELEVATIONS AND GRADIENT <br /> On September 1, 2005, the depth to groundwater was measured in monitor wells MW-1, MW-2, and <br /> MW-3. Groundwater elevation data is presented in Table 2, on the following page. The average depth to <br /> 1 <br /> `3 CONDOR <br />