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Quarterly Report - January 2000 OLYMPIAN - Jimco Truck Plaza ' 22502 South Highway 99, Ripon, California 1.0. INTRODUCTION ' At the request o Rusty f Mr. Rus Firenze of the OLYMPIAN OIL COMPANY, Advanced GeoEnvironmental, Inc. (AGE) has prepared the enclosed Quarterly Report for the Jimco Truck Stop, located at 22502 South Highway 99, Ripon, California(the site). The scope of work included groundwater monitoring and sampling of eight monitoring wells and ' one domestic well located on the site. The location of the site with respect to its surroundings is illustrated in Figure 1. Buildings and monitoring well locations on the site are illustrated in Figure 1 2 Background information, including details of previous site assessment,work,was presented'in the September 1999 Preliminary Investigation and Evaluation Report (PIER) prepared by AGE, dated ' 13 December 1999. 2.0 PROCEDURES This report is prepared in accordance with San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) and Central Valley'Regional Water Quality Control Board guidelines for subsurface investigations of underground storage tank(UST) sites. 2.1. MONITORING WELL PURGE PROCEDURES On 11 January 2000, a Solonist water level meter was used to measure the depth-to ground water from the well casing tops in wells MW-1 through MW-8. The depths to ground water ,are ' summarized in Table 1. Each ground water monitoring well (MW-1 through MW-8) than had a minimum of three well-volumes of ground water purged from the casing using a pre-cleaned, two- stage submersible pump. Monitoring wells MW-1 through MW-8 were each purged of approximately 6 gallons of ground water. Temperature, pH, and conductivity were measured at approximately two-gallon intervals using a Hydac Water Analyzer.The field data sheets are included ' in Appendix A. Purged water was stored on site in 55-gallon drums. ' 2.2. GROUND WATER SAMPLE COLLECTION Prior to collection of ground water samples, the depth to ground water was re-measured in each purged well to ensure that a minimum of 80% of the initial water volume had. recharged. Water Advanced GeoEnvironmental,Inc.