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Quarterly Report - First Quarter 2003 GUARDING AND CRAWFORD 517 West Fremont Street, Stockton, California 1.0. INTRODUCTION At the request of Guardino and Crawford Construction, Advanced GeoEnvironmental, Inc. (AGE) has prepared this quarterly report for 517 West Fremont Street, Stockton, California(the site). The site and its surroundings are illustrated on Figure 1. Structures,boring and monitoring well locations are shown on Figure 2. This quarterly report has been prepared in accordance with Central Valley Regional Water Quality Control Board(CVRWQCB)guidelines for investigations of underground storage tank(UST)sites. Background information is summarized in the AGE-prepared Quarterly Report -June 1999, dated 27 September 1999. 2.0. PROCEDURES Six ground water monitoring wells were purged and sampled on 06 March 2003. Field work was performed in accordance with San Joaquin County Environmental Health Department (EHD)- �. approved Site Assessment Work Plan Addendum, dated 07 May 1998, and Work Plan Addendum, dated 04 February 2001, both prepared by AGE. 2.1. WELL MONITORING AND EVACUATION A Solinst water level meter was used to measure the depth to ground water in the six monitoring wells relative to the tops of the well casings. The ground water elevations and gradient were determined from these data (Table 1). After recording water level measurements, a new,dedicated disposable plastic bailers were used to evacuate (purge) each monitoring well of standing water. Approximately 5 to 10 gallons of water (minimum of 3 casing-water volumes) were removed from each well. Ground water temperature, pH and conductivity were measured at regular intervals during purging using an Oak-ton water analyzer, Field sheets and data are included in Appendix A. Purged water was stored on-site in labeled, 55-gallon DOT-approved drums. 2.2. COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES _ Prior to collection of ground water samples, the depth to ground water was gauged in each purged well to ensure that a minimum of 80%of the initial well volume had recharged.Then a water sample was collected from each purged well using the dedicated disposable plastic bailer.Each water sample x Advanced GeoEnviron mental,Inc.