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' Quarterly Report ort - December 1997 MARLOWE PROPERTY ' 4648 East Waterloo Road, Stockton, California ' 10. INTRODUCTION AND SCOPE OF WORK ' In accordance with a request from Mr Jonathan Marlowe of Marlowe Properties, Advanced GeoEnvironmental, Inc (AGE) has prepared this Quarterly Report for 4648 East Waterloo Road, Stockton, California The location of the site and the immediately surrounding area are illustrated ' on Figure 1 Site structures and monitoring well locations are depicted on Figure 2 The scope of 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 Background information and a description of prior investigations at the site has been included in the IQuarterly Report-Aprrl 1996, dated 12 June 1996, prepared by AGE '• 2.0. PROCEDURES 21 MONITORING WELL PURGE PROCEDURES ' On 12 December 1997 the depth to ground water in monitoring wells W-1 through MW- 6 and VW-1 were measured to the nearest 0 01 foot utilizing a Solinst water level meter Relative ground water elevations were calculated for each well 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 8 to 10 gallons (a minimum of three well-volumes ' for each well) of water were purged from wells MW-1, MW-5, MW-6 and VW-1 utilizing a two- stage submersible pump Temperature, pH and conductivity were measured at regular intervals from each well using an ICM Model 52200 water analyzer, to monitor for stabilization of these ' characteristics during purging Stabilization data and field logs are included with Appendix A Purged ground water was containenzed in 55 gallon drums and stored on-site in an area lacking general public access 2 2 GROUND WATER SAMPLING Following the monitoring wells were allowed to recover for a minimum of one hour prior • gg to sample collection Ground water samples were collected utilizing new, disposable polyethylene Advanced GeoEnwronmental,Inc