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' Ground Water Monitoring Report - First Quarter 2002 • MARLOWE PROPERTIES ' 4696 East Waterloo Road (Formerly 4648 East Waterloo Road), Stockton, CA ' 1.0. 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 Quarterly Report-April 1996, ' dated 12 June 1996 ' 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 30 January 2002, depths to ground water were measured in wells MW-1 through MW-6 and vapor 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 elevations (Table 1) ' After water levels were measured, approximately eight to ten gallons of ground water(a minimum ofthree water-casing volumes)were removed from wells MW-1,MW-5,and MW-6,approximately ' 68 to 86 gallons of water were removed from wells MW-2, MW-3 and MW-4, and 15 gallons of water were removed from well VW-1 utilizing a Grundfos Redi-Flo submersible pump Temperature, pH and conductivity of purged water were measured for stabilization at regular ' intervals for each well using an Oakton water analyzer Field data and logs are included in Appendix A Purged groundwater 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 Water samples were collected from each purged well using new disposable plastic bailers Each . water sample was transferred Into three 40-m1 VOA vials containing 0 5 111118%hydrochloric acid Advanced heoEnvironmental,Inc