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Service Station #6100 <br /> QMR & QRPS 2Q06 <br /> August 31, 2006 <br /> • Page 2 <br /> custody documentation for the vapor samples are Included In Attachment E The operational data <br /> for the SVE system are summarized in Table 5 The analytical data for the SVE system vapor <br /> samples are summarized in Table 6 The performance data for the SVE system are summarized <br /> in Table 7 and Figures 5 and 6 <br /> Current Site Information <br /> Current Phase of Protect Groundwater Monitoring and Remediation <br /> Quarterly MW-1, MW-2, MW-4, MW-6, MW-8 through <br /> Frequency of Monitoring and Sampling MW-10, MW-12, MWA 3, and MWA 5, and extraction <br /> well DW-1 <br /> Is Free Product(FP) Present on Site? Yes in MWA 5 <br /> Historic Range In Depth to Water, feet <br /> below top of casing (TOC) 52 8 MW-8 (612005) and 106 94 MWA 5 (1212005) <br /> Q2-2000 to Q2-2006 <br /> Water Supply Wells within a 2,000-foot A water supply well was installed in the southwestern <br /> radius and their Respective Direction corner of the property in 1969 and currently supplies <br /> water to the service station <br /> Current Remediation Techniques Soil Vapor Extraction <br /> • Current Quarter Monitoring Data <br /> Monitoring Wells Sampled MW-1, MW-2, MW-4, MW-10, MW-13, MW-16, MW- <br /> 17, MW-18, VW-3, VW-5, VW-6, and DW-1 <br /> Sampling Date June 26, 2006 <br /> Dissolved Oxygen Concentrations 0 4 (MW-10) through 4 1 (MW-17) <br /> Measured In milligrams per Liter (mg/L) <br /> Depth to Groundwater(DTW) feet 51 (MW-4) through 105 74 (MW-15) <br /> below TOC range 2Q06 <br /> Average Change In Groundwater 1 74 foot decrease (196 30 [1Q06] — 198 04 [2Q06]) <br /> Elevation Since Last Event <br /> Groundwater Flow Direction and Shallow Zone Southeast at 0 2 feet per foot (ftlft) <br /> Gradient Deep Zone East at 0 1 ft/ft <br /> Minimum Concentrations Maximum Concentrations <br /> Current Quarter Analytical Data micrograms per liter micrograms per liter <br /> IL IL <br /> Gasoline Range Organics (GRO) 75 (DW-1) 940,000 (MW-4) <br /> Benzene <0 50 28,000 (MW-1) <br /> . Methyl-tert butyl ether(MtBE) <0 50 160 (VW-6) <br /> 1BP-ARCM04 BP Valley Portfolio161001ReportslQMRs16100 2Q2006 doc SECOR Intemabonal Incorporated <br />