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• Quarterly Report - First Quarter 2006 TRACY MARINE SALES 2353 Toste Road,Tracy, California 1 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 I On-site structures, soil borings, and monitoring well locations are illustrated on Figure 2 Site background information is summarized in Appendix A 20. PROCEDURES Eleven ground water monitoring wells (MW-1 through MW-11) were purged and sampled on 14 March 2006 and an ozone-injection air-sparging system continually operated over the first quarter 2006 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 {� 2 1 WELL MONITORING AND EVACUATION On 14 March 2006, a Solinst water level meter was used to measure the depth to ground water in wells MW-I through MW-I 1 relative to the tops of the well casings The ground water elevations and gradient were determined from these measurements(Table 1) Additionally,a Hanna Instruments (HI) 9025 water analyzer was used to measure the oxidation-reduction potential in the monitoring well network throughout the first quarter 2006 Dissolved oxygen and ORP field logs are included in Appendix B After recording water level measurements,disposable plastic bailers were used to purge wells MW-1 through MW-I I of standing water Approximately 4 5 to 6 gallons of water (a minimum of three casing-water volumes perwell)were removed from wells MW-1 through MW-5,MW-7,and MW-9, through MW-11 and approximately 12 gallons of water were removed from MW-6 Approximately 2 gallons of water were removed from well MW-8 before the well was bailed dry Ground water temperature,pH and conductivity were measured at regular intervals during purging using an Oakton water analyzer Field sheets and data are included in Appendix C Purged water was stored on-site in labeled, 55-gallon Department of Transportation (DOT)-approved drums 22 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES Water samples were collected from the purged wells using the dedicated disposable plastic bailers after allowing the wells to achieve a minimum 80% recovery of the pre-purge water volume Each . Advanced GeoEnriron mental,Inc