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I _ Quarterly Report - January 1998 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 1 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 previous investigations at the site was included in the Preliminary Site Investigation and Evaluation Report-August 1996, dated 09 September 1996 prepared by AGE �. 2 0. QUARTERLY MONITORING PROCEDURES 2 1 MONITORING WELL PURGE PROCEDURES On 09 January 1998 the depth to ground water was measured in monitoringwells MW- through g MW-9, VW-1, VW-2, AW-IB and AW-213 (the monitoring wells) from the top of each respected 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 relative 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 2 to 18 gallons of ground water (a minimum of three well volumes per well) were removed from the monitoring wells utilizing a two stage submersible pump Temperature, pH and conductivity of purged water were measured at regular intervals from each well using an lCM Model 52200 water analyzer, to monitor for stabilization of diose c.harac.iensucs during purging Dissolved oxygen was measured at each monitoring well 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 Ads.axced GeoEn,+iron mcnlal,Inc