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Quarterly Report - February 1998 PACIFIC CAR WASH 4405 Pacific Avenue Stockton, California 11.0. INTRODUCTION AND SCOPE OF WORK In accordance with a request from Ms Lila Billheimer, Chief Executor for the Estate of J C Shaughnessy,Advanced GeoEnvironmental, Inc (AGE)has prepared this Quarterly Report for 4405 Pacific Avenue, Stockton, California(the site) The location of the site is illustrated in Figure 1 A plan of the site is illustrated in 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) kites A summary of previous investigations at the site was included in the Preliminary Site Investigation and Evaluation Report-January 1997, dated 15 January 1997 and prepared by AGE 20 PROCEDURES 2 1 QUARTERLY MONITORING AND SAMPLING ACTIVITIES On 18 February1998 the depth to ground w w w W- p g u iter as measured in monitoring ells M 1 through MW-6 (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 surNeyed 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 6 to 12 gallons of ground water (a minimum of three well volumes per well) were removed from the monitoring wells utilizing a two stage submersible pump While purging water,temperature,pH and conductivity were measured at regular intervals from each well to monitor for stabilization using an ICM Model 52200 water analyzer Dissolved oxygen was measured in water purged from 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 i4dvarrced GtoEnriron mental,Inc