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i Ozone Well Installation And Sampling Report - First Quarter 2011 FORMER CURTIS PONTIAC-BUICK 2450 Toste Road, Tracy, California 1.0. INTRODUCTION AND SCOPE OF WORK Advanced GeoEnvironmental, Inc. (AGE) has prepared this Ozone Well Installation And Sampling Report - First Quarter 2011 for the former Curtis Pontiac-Buick site located at 2450 Toste Road, Tracy, California. The enclosed report documents the installation of ten ozone injection wells, the performance of a limited ground water monitoring event and the disposal of non-hazardous waste associated with site drilling activities. The report was prepared in accordance with guidelines issued by the California Regional Water Quality Control Board (RWQCB) - Central Valley Region for investigations of underground storage tanks (UST).The location of the site is illustrated in Figure 1; general site features are illustrated in Figure 2. Well construction details are summarized in Table 1. Historical site background information is summarized in Appendix A. 2.0. WELL INSTALLATION PROCEDURES On 26 and 27 January 2011, ten ozone injection diffuser screens (OW1 through OW10) were installed at the site to total depths ranging from 14 to 15 feet below surface grade . (bsg). Field procedures for the above scope of work were outlined in the AGE-prepared, Ozone Injection Work Plan, dated 05 November 2010, and subsequently approved by San Joaquin County Environmental.Health Department (EHD) letter dated 10 November 2010 (Appendix B). A copy of the required EHD drilling permit is included in Appendix C. 2.1. DRILLING AND SOIL SAMPLING Pilot soil borings for wells OW 1 through OW 10 were advanced at the site to total depths ranging from 15 to 16 feet bsg utilizing a CME-75 limited access drill rig equipped with 8-inch diameter hollow-stem augers. Drilling services were provided by All Well Abandonment of Diamond Springs, California. All soil cuttings and rinseate water generated during drilling activities were contained in Department of Transportation (DOT)- approved 55-gallon drums and were covered, sealed, labeled and stored on-site pending proper disposal. The boring and well;locations are depicted in Figure 2. Soil samples were collected between 13.5 and 15 feet bsg from borings OW 1, OW2, OW4, and.OW5, between 11.5 and 14.5 feet bsg in boring OW7, and between 12.5 and 14 feet bsg in boring OWB. Soil samples were not collected from borings OW3, OW6, OW9, and OW 10. Additionally, soil cuttings from selected borings were observed and logged during hand clearing and drilling activities. Samples were collected ahead of the drill bit using a California modified split-spoon sampler loaded with three pre-cleaned 2-inch by 6-inch Advanced GeoEnvironmental,Inc.