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Quarterly Report - Second Quarter 2000 Shockey and Sons Trucking 850 Milgeo Avenue, Ripon, California 1.0. INTRODUCTION At the request of Mr. Lee Shockey, Acivancecl GeoEnvironmental, Inc. (AGE) has prepared this Quarterly Report for the site located at 850 Milgeo Avenue, Ripon, California (the site). The scope of work included the monitoring of four ground water monitoring wells. The location of the site and its surroundings are depicted in Figure 1. Monitoring w=ells,probe boring locations and structures on the site are shown in Figure 2. Field work was performed in accordance with guidelines developed by the San Joaquin Count}-Public _ Health Services - Environmental Health Division (P11S-EHD) and Central Valley Regional Water Quality Control Board(CVRWQCB)for the investigation of underground storage tank (UST)sites. Site history and findings from previous investigations and previous monitoring events at the site are detailed in the Preliminary Invesligalion aml Evalualion Reporl dated 15 August 1996,prepared by AGE. Quarterly monitoring data from April 1996 to the present is summarized in Tables i and 2 in _ this report. — 2.0. PROCEDURES All work was conducted in accordance with Ifn,e.sligalion/Reniedial Feasibility S'ludv fEork Plan, dated 10 June 1999 prepared by AGE and approved by the PIIS-LHD on 08 July 1999. 2.1. MONITORING WELL PURGE PROCEDURES On 15 .lune 2000, the water level in each monitoring, well was measured relative to the tops of the well casings using a Solinst water level meter. The depths to ground water and relative ground water elevations are given in Table 1. After depth to ground water gauging, a two-stage submersible pump was used to purge each well. Nine gallons of water were removed from MW-1,eight gallons were removed from MW-21 and MW- 3 W- s and twenty gallons of water were removed from MW-4 (minimum of three saturated well casing- volumes per well).The ground water parameters oftemperature,pI-I and conductivity were measured at regular intervals, using an ICM water analyzer. The ground water parameters stabilized during purging(Appendix A). Purged water was stored on-site in 55-gallon Department of Transportation (DOT)-approved drums. Advanced GeoE rn ironmentnl.Inc.