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S EC0ll� <br /> Service Station #5469 <br /> QGM & RPR 2Q06 <br /> September 18, 2006 <br /> Page 2 <br /> management activities associated with the OS system are included in Attachment D Analytical <br /> results for the joint monitoring sites are included as attachment E <br /> Current Site Information <br /> Current Phase of Project Groundwater Monitoring and Remediation <br /> Frequency of Monitoring and Sampling Quarterly 13 wells (MW-1, through MW-13) <br /> Is Free Product (FP) Present on Site'? No <br /> Historic range of monitoring wells as <br /> Depth to Water(DTW), feet below top of 36 42 MW-3 (612000) and 45 77 MW-8 (1212004) <br /> casing TQC Q3-2000 to Q2-2006 <br /> Water Supply Wells within a 2,000-foot Two domestic, twelve municipal, two industrial, two <br /> radius Irrigation and three unknown use wells <br /> Current Remediation Techniques Ozone Sparge <br /> Current Quarter Monitoring Data <br /> Wells Monitored and Sampled MW-1 through MW-13 <br /> Sampling Date May 30, 2006 <br /> • Dissolved Oxygen Concentrations 6 1 (MW-7)through 0 7 (MW-8) <br /> Measured In milligrams per Liter(mg/L) <br /> i <br /> DTW, feet below TOC in Shallow zone 38 10 (MW-5)through 39 40 (MW-10) <br /> Average Change in Groundwater 2 84 feet increase (-25 79 [1 Q06] ---22 95 [2Q06]) <br /> Elevation Since Last Event <br /> Groundwater Flow Direction and Northeast at 0 002 feet per foot(ftlft) <br /> Gradient <br /> Minimum Concentrations Maximum Concentrations <br /> Current Quarter Analytical Data micrograms per liter micrograms per liter <br /> (pg-- — IL IL <br /> Gasoline Range Organics GRO <50 3,500 MW-8 <br /> Benzene <0 50 0 63 MW-10 <br /> Methyl tert-butyl ether MtBE <0 50 5,100 MW-6 <br /> 1,2-dichloroethane 1,2-DCA <0 50 2,300 MW-13B <br /> 1 IBP-AR=04 BP Valley Portfolio154691ReportslQMRs1200615469 2Q2006 doc SECOR lntemabonal Incorporated <br />