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i Quarterly Report - First Quarter 2004 TRACY MARINE SALES 2353 Taste Road, Tracy, California I1.0. INTRODUCTION At the request of Mr Joe Toste, Jr , Advanced GeoEnvironmental, Inc (AGE) has prepared this quarterly report for the property located at 2353 Toste Road, Tracy, California The site and the surrounding area are illustrated on Figure 1 On-site structures,boring locations and monitoring well locations are illustrated on Figure 2 Background information is summarized in the AGE-prepared Additional Site Assessment Work Plan, dated 26 September 2000 2.0. PROCEDURES I On 24 and 30 January 2004, ten ozone sparge wells were installed at the site and the ozone sparge piping system was installed on 06 and 07 March 2004 Eleven ground water monitoring wells (MW-1 through MW-11)were purged and sampled on 27 March 2004 Field work was performed in accordance with guidelines issued by the Central Valley Regional Water Quality Control Board (CVRWQCB) for the investigation of underground storage tank (UST) sites 21 In-Situ OZONE SPARGE SYSTEM INSTALLATION ' Eight shallow-screened and two deep-screened in-situ ozone sparge(IOS)wells were installed at the site and the system distribution piping was installed during the first quarter 2004 2 1 1 Ozone Sparge Well Installation P ' On 24 and 30 January 2004,eight soil borings were advanced at the site using a CME-75 high torque drill rig equipped with 8 25-inch diameter hollow-stem augers to install IOS wells OS-1 through ' OS-10 The drill rig and two-man crew were supplied by Mitchell Drilling Environmental Auger returns generated by drilling were stored in properly labeled Department of Transportation(DOT)- approved model 17H 55-gallon drums pending laboratory analysis Soil samples were not collected IPilot bonngs were completed as IOS wells using manufacturer-assembled 2-inch by 30-inch microporous sparge points from approximately 17 5 to 20 feet bsg for shallow wells OS-1 through OS-8 and from 41 5 to 44 feet bsg for deep wells OS-3 and OS-4, wells were completed with blank casing extended to the surface The filter pack (No 2116 Monterey sand) was installed from total depth of each boring to approximately 2 feet above the sparge point A nominal 2-foot bentonite chip ' plug was then installed above the filter pack and hydrated The wells were then grouted to near surface grade with portland cement Water-tight, traffic-rated well boxes were then installed over the wells As-built well diagrams are included as Appendix A Ozone well locations are illustrated IAdvanced CeoFnvironmental,Inc