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Quarterly Report - Second Quarter 2004 LOCAL FOOD STORE 2650 Monte Diablo Avenue, Stockton, California I.O. INTRODUCTION At the request of Mr. Liaquat Khan, Advanced GeoEnvironmental, Inc. (AGE) has prepared this quarterly report for Local Food Store, located at 2650 Monte Diablo Avenue, Stockton, California (the site). The scope of work included monitoring and sampling five ground water monitoring wells and preparation of this report. The location of the site is illustrated on Figure 1. On-site structures, boring and monitoring well locations are illustrated on Figure 2. This report was prepared in accordance with Central Valley Regional Water Quality Control Board _ (CVRWQCB)guidelines for subsurface investigations of underground storage tank(UST) sites. A general history of the site is included in Appendix A. Previous ground water monitoring results are included in the tables of this report. 2.0. PROCEDURES Field work was performed in accordance with San Joaquin County Environmental Health Department (EHD) guidelines for sampling ground water monitoring wells and Central Valley �- Regional Water Quality Control Board (CVRWQCB) guidelines for the investigation of underground storage tank (UST) sites. 2.1. WILL HEAD SURVEY On 01 April 2004, a California state-licensed surveying engineer from Baumbach & Piazza, Inc. surveyed the location and elevation of monitoring well MW-5; the location was surveyed to the nearest 0.1-foot relative to coordinate datum NAD 83 (1986),and the elevation at the top of the well casing was surveyed to the nearest 0.01-foot relative to Stockton Benchmark #253, surveyed at an elevation of 2.39 feet above mean sea level (MSL) The results of the monitoring well survey are included in Table 1. 2.2. INTERIM GROUND WATER REMEDIATION Ground water remediation system installation and operation was performed in accordance with procedures described in the approved Interim Remediation/Additional Site Assessment Work Plan, dated 15 May 2003. Trenching and piping for the remediation system was conducted on 12 and 13 April 2004. A fenced enclosure for the remediation system was constructed on 19 and 21 April 2004. Pumps and tubing were installed in the extraction wells on 30 April 2004. Carbon vessels and a baker tank were placed in the fenced enclosure on 06 May 2004. Additional remediation equipment Advanced Geo Environmental.Ine.