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r ' Quarterly Report - August 1997 CHAPIN BROS.,INC. ' 1766 Monte Diablo Avenue, Stockton, CA 1.0. INTRODUCTION In accordance with the request of Mr Russell Chapin,Advanced GeoEnvironmental,Inc (AGE)has ' prepared this Quarterly Report of field activities conducted at 1766 Monte Diablo Avenue, Stockton, California Quarterly ground water monitoring activities were performed on 21 August 1997 Soil and ground water remediation unit operations are also detailed in this report The location of the site and its surroundings are illustrated in Figure 1 -Location Map Structures and well locations ron the site are illustrated in Figure 2 - Site Plan The ground water monitoring activities were performed in accordance with guidelines for investigation of underground storage tank(UST)sites established by the San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) and Central Valley Regional Water Quality Control Board (CVRWQCB) rSite history and findings from previous investigations and monitoring events at the site are detailed in the Final Remedial Plan (FRP) prepared by Geological Audit Services and previous Quarterly Reports prepared by various consultants 2.0. PROCEDURES 21 MONITORING WELL PURGE PROCEDURES On 21 August 1997, a Solinst water level meter was used to measure the depth to ground water in monitoring wells MW-1 through MW-6 relative to the tops of the well casings Monitoring wells MW-1 and MW-4 were checked for the presence of free product using an Ullage interface probe The relative ground water elevations were calculated by subtracting the depths to ground water from tthe surveyed well casing elevations (Table 1) After making and recording the depth to ground water measurements, monitoring wells MW-1 rthrough MW-6 were purged using a two-stage purge pump A minimum of three well volumes of water was removed from each well Ground water parameters (temperature, pH and conductivity) ' of purged ground water were measured at regular intervals using an ICM model 52204 water analyzer r The purge pump was washed in an Alconox solution and rinsed with tap water prior to purging each well Purged water was stored in 55-gallon drums on property Field logs of the measured ground water purging parameters are included in Appendix A r