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C A M B R I A Date October 14, 2005 <br /> is <br /> Quarter Sed Quarter 2005 <br /> OLYMPIAN QUARTERLY GROUNDWATER MONITORING REPORT <br /> Fund Claim No 12820 Address 1022 Frontage Road, Ripon, California <br /> Consulting Co/Project Manager Cambria Environmental Technology Inc/Brandon Wilken <br /> Consulting Co Project No 165-1556 <br /> Primary Agency/Regulatory ID No San Joaquin County Environmental Health Division/ <br /> Site Code 1604 <br /> WORK PERFORMED THIS QUARTER (THIRD - 2005) <br /> 1 Performed third quarter groundwater monitoring and sampling activities on August 31, 2005 <br /> 2 Submitted quarterly groundwater monitoring report for third quarter 2005 <br /> 3 Sampled one soli boring, installed one monitoring well, and installed one air sparge well <br /> 4 Completed a soil vapor extraction/ air sparging feasibility test <br /> WORK PROPOSED FOR NEXT QUARTER (FOURTH —2005) <br /> 1 Perform quarterly groundwater monitoring and sampling for fourth quarter 2005 <br /> 2 Prepare and submit quarterly groundwater monitoring report for fourth quarter 2005 <br /> 3 Prepare and submit site assessment and feasibility testing reports <br /> • QUARTERLY MONITORING <br /> Current Phase of Project Monitoring and assessment <br /> Frequency of Groundwater Monitoring Quarterly <br /> Is Free Product(FP) Present on Site No <br /> Current Remediation Techniques Natural Attenuation <br /> Average Depth to Groundwater 24 56 ft below ground surface <br /> Groundwater Flow Direction and <br /> Gradient East-southeast, 0 0006 ft/ft <br /> DISCUSSION <br /> Groundwater levels measured on August 31, 2005 indicate that groundwater beneath the site <br /> flows toward the east-southeast at a gradient of approximately 0 0006 ft/ft Groundwater flow <br /> direction has fluctuated since groundwater monitoring began in August 1999 Groundwater <br /> elevation contours are shown on Figure 2 <br /> Select groundwater samples were analyzed for total petroleum hydrocarbons as diesel (TPHd) <br /> and total petroleum hydrocarbons as motor oil (TPHmo) by modified United States <br /> Environmental Protection Agency (EPA) Method SW8015C, total petroleum hydrocarbons as <br /> gasoline (TPHg), benzene, toluene, ethylbenzene, and xylenes (BTEX) by EPA Method <br /> SW8021B methyl tertiary-butyl ether (MTBE), tertiary-amyl methyl ether (TAME), tertiary butyl <br /> . alcohol (TBA), - ditsopropyl ether (DIPS), ethylene dibromtde (EDB)" f; rA 7 <br /> ethanol, ethyl tertiary-butyl ether (ETBE), methanol and 1,2-dichloroethane (1,2-DCA) by EPA Sg(v; <br /> Method SW8260B <br /> 44 61DL rn� <br /> H I01ympian122502 South Hwy 99 RtponIQM133Q 0513Q 05 QMR doc <br />