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y L . Quarterly Report - First Quarter 2004 RIPON FARM SERVICE 22871 South Highway 99, Ripon, California 1.0. INTRODUCTION AND SCOPE OF WORK At the request of Mr. Allan Fetters, Advanced GeoEnvironmental, Inc. (AGE) has prepared this report of environmental activities conducted at 22871 South Highway 99, Ripon, California (the site). The location of the site and its surroundings are illustrated in Figure 1. Structures,monitoring well and remediation well locations associated with the site are depicted in Figure 2. This report documents the performance of the fourth quarter ground water monitoring event on 04 November 2003. Operation of a soil vapor extraction(SVE)vacuum blower ceased in January 2004 due to malfunction of the equipment. A sample of the soil vapor from the monitoring events during the last quarter of 2003 was absent of detectable hydrocarbons, therefore SVE was not restarted. Background information, including details of previous site assessment work, was presented in the AGE-prepared Corrective Action Plan, dated 01 June 1999. . 2.0. PROCEDURES All field work was performed in accordance with Central Valley Regional Water Quality Control Board(CVRWQCB)guidelines for the investigation of underground storage tank(UST)sites. Soil- vapor extraction monitoring was preformed in accordance with procedures outlined in the Revised Remedial Action Work Plan Addendum and Remedial Action Work Plan, prepared by AGE and approved by the San Joaquin County Environmental Health Department (EHD) by letter, dated 21 April 2000. Ground water monitoring and sampling was performed in accordance with EHD guidelines for the sampling of ground water monitoring wells. 2.1. WELL MONITORING PROCEDURES Quarterly ground water monitoring activities were conducted on 23 March 2004. Monitoring wells MW-1 to MW-5 were monitored and sampled. 2.1.1. Well Monitoring and Evacuation A Solinst water level meter was used to measure the depth to ground water in on-site wells MW-1 through MW-5 relative to the tops of the well casings. The total depth of each well was also measured, after sediment was removed from the well casing. The ground water elevations and gradient were determined from these data (Table 1). Advanced GcoE,nvirnnmental,Inc.