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C Quarterly Report - April 1995 CALIFORNIA FUELS CARDLOCK STATION 2402 Pacific Avenue Stockton, California 1.0. INTRODUCTION AND SCOPE OF WORK In accordance with a request from Mr. David Atwater of Van De Pol Enterprises, Advanced GeoEnvironmental, Inc (AGE) has prepared this Quarterly Report for 2402 Pacific Avenue (the site), Stockton, California The location of the site and the immediately surrounding area are illustrated on Figure I The monitoring well locations are shown on Figure 2 The objective of the work was to monitor dissolved petroleum hydrocarbon concentrations in ground water and to characterize ground water flow direction and gradient on the site This report is prepared in accordance with guidelines established by the San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) and the Central Valley Regional Water Quality Control Board (CVRWQCB) for investigation of underground storage tank (UST) sites A summary of prex sous investigations at the site was included in the P1 elim?na?y Site Investigation and Evaluation Repo?t -August 1996 dated 09 September 1995 prepared by AGE I2 0. QUARTERLY MONITORING PROCEDURES 21 MONITORING WELL PURGE PROCEDURES On 08 April 1998 the depth to ground water,,Nas measured in monitoring wells MW-1 through MW- 9,VW-1,AW-I and AW-2 (the monitoring«ells) from the top of each respective well casing to the nearest 0 01 foot utilizing a Solinst water level meter Ground water elevations from the monitoring wells were calculated by subtracting the measured depth to ground water from the surveyed casing elevations (Table 1) Ground water elevations with respect to mean sea level were plotted and contoured on a scaled site map (Figure 3) ' After water levels were measured, approximately six to twenty gallons (a minimum of three well volumes per well) of water were purged from the monitoring wells utilizing a two-stage submersible pump An ICM Model 52200 water analyzer was utilized to monitor temperature, pH and condiictivity of purged water at _regular purge volumes Dissolved oxygen content in the final purge water was measured using a YSI Model 55 Dissolved Oxygen Meter following stabilization of the produced water Stabilization data and field logs are included with Appendix A, dissolved oxygen field measurements are summarized in Table 2 Purged ground water was containerized in 55-gallon drums and stored on-site in an area lacking general public access .4d►anced GtoEnrironmcntal,lnc