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C <br /> Station #11194 <br /> Quarterly Groundwater Monitoring Report (1Q2006) <br /> April 28, 2006 <br /> Page 2 <br /> Current Site Information <br /> Current Phase of Project Groundwater Monitoring <br /> Frequency of Monitoring and Sampling Quarterly AMW 1 through 8 and MW-1 through MW- <br /> Is Free Product (FP) Present on Site? No <br /> FP Recovered This Quarter? NIA <br /> Cumulative FP Recovered to Date NIA <br /> Historic Range in Depth to Water, Q4- 4 26 (MW-6) to 7 15 (MW-7) feet below ground <br /> 2005 to Q1-2006 surface (bgs) <br /> Water Supply Wells within a 2,000-foot <br /> radius and their Respective Direction No water supply or wells found <br /> Current Remediation Techniques Natural Attenuation <br /> Current Quarter Monitoring Data <br /> Wells Monitored and Sampled AMW-3, AMW-5, AMW-6, MW-4, MW-6, MW-7 (BP <br /> wells <br /> • <br /> Sampling Date January 26, 2006 <br /> Dissolved Oxygen Concentrations Unknown <br /> Measured In <br /> Depth to First Groundwater (DTW, feet 4 47 (AMW-4, MW-3) <br /> bgs) <br /> Depth to Lower Groundwater (DTW, feet 6 96 (AMW-3) <br /> bgs) <br /> Average Change in Groundwater Approximately 0 5 ft <br /> Elevation Since Last Event <br /> Groundwater Flow Direction and Northwest at 0 006 foot/foot (ft/ft) <br /> Gradient <br /> Current Quarter Analytical Data <br /> Minimum/Maximum TPHg Concentrations ND<50 IL —920 IL MW-6 <br /> Minimum/Maximum Benzene ND<50 pg/L <br /> Concentrations <br /> Minimum/Maximum MtBE Concentrations ND<0 50 pgIL AMW-5)—6 1 IL MW-2 <br /> • <br /> 11BP-ARC0105 BP-COP sites1111941Reports\QMRs111194 1Q06 QMR doc SECOR International incorporated <br />