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i tiQuarterly Report - Second Quarter 2002 MARLOWE PROPERTIES 4696 East Waterloo Road (Formerly 4648 East Waterloo Road), Stockton, CA I1.0 INTRODUCTION AND SCOPE OF WORK At the request of Mr Jonathan Marlowe,Advanced GeoEnvironmental,Inc (AGE)has prepared the enclosed report of environmental activities conducted at 4696 East Waterloo Road (formerly 4648 East Waterloo Road), Stockton, California The scope of work included quarterly ground water monitoring and preparation of this report The site and the surrounding area are illustrated in Figure 1 Structures and monitoring well locations are illustrated on Figure 2 A summary of previous investigations at the site was included in the AGE-prepared Confirmation Soil Boring Work Plan, dated 30 May 2000 ' 2.0 PROCEDURES Field work was conducted and this report was prepared in accordance with guidelines issued by the Central Valley Region of the Regional Water Quality Control Board (CVRWQCB) for subsurface Investigation of underground storage tank (UST) sites and guidelines provided by San Joaquin County Environmental Health Department (EHD) for sampling ground water monitoring wells 2 1 WELL MONITORING AND EVACUATION On 26 June 2002, �'depths to ground water were measured in wells MW-1 through or h MW-6 and vapor p g p extraction well VW-1 from the tops of the well casings to the nearest 0 01-foot utilizing a Solinst water level meter The ground water elevation in each well was calculated by subtracting the measured depth to ground water from the surveyed casing elevation (Table 1) After water levels were measured, approximately 7 to 10 gallons of ground water (a minimum of three water-casing volumes) were removed from wells MWA, MW-5, MW-6 and VW-1 utilizing new disposable plastic bailers, wells MW-2, MW-3 and MW-4 were not purged or samples this quarter Temperature,pH and conductivity ofpurged water were measured for stabilization at regular intervals using an Oakton water analyzer Field data and logs are included in Appendix A Purged ground water was containerized in DOT-approved 55-gallon drums and was stored on-site in an area lacking general public access 2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES I Water samples were collected from each purged well using new disposable plastic bailers after allowing the wells to achieve a minimum 80%recovery of the pre-purge water volume Each water sample was transferred into three 40-m1 VOA vials containing 0 5 ml 18% hydrochloric acid as a Advanced Geo Environmental,Inc