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' Quarterly Report ort - December 1997 <br /> MARLOWE PROPERTY <br />' 4648 East Waterloo Road, Stockton, California <br />' 10. INTRODUCTION AND SCOPE OF WORK <br />' In accordance with a request from Mr Jonathan Marlowe of Marlowe Properties, Advanced <br /> GeoEnvironmental, Inc (AGE) has prepared this Quarterly Report for 4648 East Waterloo Road, <br /> Stockton, California The location of the site and the immediately surrounding area are illustrated <br />' on Figure 1 Site structures and monitoring well locations are depicted on Figure 2 <br /> The scope of work was to monitor dissolved petroleum hydrocarbon concentrations in ground water <br />' and to characterize ground water flow direction and gradient on the site This report is prepared in <br /> accordance with guidelines established by the San Joaquin County Public Health Services - <br /> Environmental Health Division(PHS-EHD) and the Central Valley Regional Water Quality Control <br />' Board (CVRWQCB) for investigation of underground storage tank(UST) sites <br /> Background information and a description of prior investigations at the site has been included in the <br /> IQuarterly Report-Aprrl 1996, dated 12 June 1996, prepared by AGE <br />'• 2.0. PROCEDURES <br /> 21 MONITORING WELL PURGE PROCEDURES <br />' On 12 December 1997 the depth to ground water in monitoring wells W-1 through MW- <br /> 6 and <br /> VW-1 were measured to the nearest 0 01 foot utilizing a Solinst water level meter Relative ground <br /> water elevations were calculated for each well by subtracting the measured depth to ground water <br /> from the surveyed casing elevations (Table 1) Ground water elevations with respect to mean sea <br />' level were plotted and contoured on a scaled site map (Figure 3) <br /> After water levels were measured, approximately 8 to 10 gallons (a minimum of three well-volumes <br />' for each well) of water were purged from wells MW-1, MW-5, MW-6 and VW-1 utilizing a two- <br /> stage submersible pump Temperature, pH and conductivity were measured at regular intervals from <br /> each well using an ICM Model 52200 water analyzer, to monitor for stabilization of these <br />' characteristics during purging Stabilization data and field logs are included with Appendix A <br /> Purged ground water was containenzed in 55 gallon drums and stored on-site in an area lacking <br /> general public access <br /> 2 2 GROUND WATER SAMPLING <br /> Following the monitoring wells were allowed to recover for a minimum of one hour prior <br /> • gg <br /> to sample collection Ground water samples were collected utilizing new, disposable polyethylene <br /> Advanced GeoEnwronmental,Inc <br />