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' Quarterly Report - First Quarter 2004 GUARDINO AND CRAWFORD ' 517 West Fremont Street, Stockton, California ' 10. INTRODUCTION ' At the request of Guardmo 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 Additional site background information is provided in Appendix A 20 PROCEDURES Six ground water monitoring wells were purged and sampled on 24 March 2004 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 This quarterly report has been prepared in ' accordance with Central ValleyRegional Water Quality Control Board(CVRWQCB)guidelines for investigations of underground storage tank (UST) sites ' • 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, new dedicated disposable plastic bailers were used to evacuate(purge)each monitoring well of standing water Approximately 5 0 to 9 75 gallons of water (minimum of casing-water volumes)were removed from wells MW-1,MW-2,MW-3,MW-4 and MW-6 and 5 25 gallons of water were removed from well MW-5 before it was purged dry Ground ' water temperature,pH and conductivity were measured at regular intervals during purging using an Oakton water analyzer Field sheets and data are included in Appendix B Purged water was stored on-site in labeled, 55-gallon DOT-approved drums 2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES J Prior to collection of ground water samples,the depth to ground water was measured 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 • was transferred into three 40-m1 volatile organic analysis (VOA) vials containing 0 5 ml 18% hydrochloric acid as a sample preservative After collection, the samples were properly labeled, 1 Advanced GeoEnvironmental,Inc