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, <br /> ' ARCO Service Station No.6080- <br /> S ECOR <br /> QMR 3Q07 <br /> October 29,2007 <br /> E Page 2 <br /> s <br /> r <br /> Current Site Information <br /> Current Phase of Project: Groundwater Monitoring and Sampling <br /> Frequency of Monitoring and Sampling: Quarterly: MW-1 through MW-3 <br /> Cumulative Separate Phase Hydrocarbon <br /> Norie <br /> SPH removed fro site: <br /> Historical Range in Depth to Water (DTW), 7.73 (MW-2,-2Q00) through 12.35 <br /> feet below top of casing TOC 2Q00 to 3Q07: MW-1, 3Q07 <br /> Water Supply Wells within a 2,000-foot radius No domestic or municipal wells were found <br /> and their Respective Direction: within a 2000-foot radius <br /> Current Remediation Techniques: Natural Attenuation <br /> Current Quarter Monitoring Data <br /> Wells Monitored and Sampled: MWA through MW-3 <br /> Sampling Date: September 6, 2007 <br /> Are SPH Present on Site'?: No <br /> Dissolved Oxygen Concentrations <br /> Measured in milligrams per Liter m IL : 2.7 (MW-1)to 3.0 (MW-2 and MW-3} <br /> Depth to Groundwater(DTW)feet below <br /> TOC: 11.50 (MW-2) through 12.35 (MW-I) <br /> Average Change in Groundwater Elevation 0.41 decrease €2.53 (2Q07)—2.12 (3=)] <br /> Since Last Event (ftj: <br /> Groundwater Flow Direction and Gradient feet North-Northwest at 0.0007 <br /> per foot ftlft : <br /> Current Quarter Analytical Data Minimum Concentration Maximum Concentration <br /> micrograms per liter IL IL <br /> Gasoline Range Organics (GRO): <50 <50 <br /> Benzene: <0.50 <0.50 <br /> Methyl Tert-Butyl Ether.(MTBE): <0.50 0.65 (MW-1) <br /> Di-isopropyl Ether(DIPS): <0.50 2.4 (MW-3) <br /> i <br /> MONITORING AND SAMPLING PROCEDURES <br /> This quarter's samples were collected by Stratus on September 6, 2007. All monitoring and <br /> sampling activities performed for this site during 3Q07 were overseen by Stratus and reviewed <br /> and certified by a Stratus California Professional Geologist. <br /> GROUNDWATER SAMPLE ANALYSES <br /> Groundwater samples collected from each well were submitted to TestAmerica Analytical <br /> Testing Corporation on Morgan Hill, California for analysis of GRO, benzene, toluene, <br /> ethylbenzene, xylenes, MTBE, tert-butyl alcohol, DIPE, ethyl tert-butyl ether, tert-amyl methyl <br /> ether; ethanol, and 1,2-dichloroethane and by Environmental Protection Agency Method 8260B. <br /> 6080 3007 QMR.doc SECOR International Incorporated <br />