ARCHIVED REPORTS XR0000699 - Laserfiche WebLink

Home Browse Search

IQuarterly Report - February 1999 FLAG CITY CHEVRON 6421 Capital Avenue, Lodi, California 1.0. INTRODUCTION AND SCOPE OF WORK t � Advanced GeoEnvironmental, Inc (AGE) has prepared this Quarterly Report for 6421 Capital Avenue (the site), Lodi, California The site setting is illustrated on Figure 1 Site structures and monitoring well locations are depicted on Figure 2 IThe objective of the work was to monitor dissolved petroleum hydrocarbon concentrations in ground - water,to monitor dissolved petroleum hydrocarbons in the domestic drinking water well located 150 feet southwest of the site 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 by the Central Valley Regional - I Water Quality Control Board (CVRWQCB) for investigation of underground storage tank (UST) sites Background information and a description of prior investigations at the site was included in AGE's Closure Summary Report -April 1996, dated 28 April 1997 I 2.0. QUARTERLY MONITORING AND SAMPLING PROCEDURES On 25 February 1999,ground water monitoring and sampling was performed at wells MW-1 MW-2, I MW-4, MW-5, MW-6 and MW-7, ground water sampling was performed at the domestic drinking water well located 150 feet southwest of the site Ground water monitoring procedures for the site were outlined in the Work Plan Addendum, dated 28 January 1998 and approved by the PHS-EHD Iby a letter on 24 February 1998 i - I21 MONITORING WELL PURGE PROCEDURES Depth to ground water was measured at each monitoring well from the tops of the well casings at Ithe site to the nearest 0 01 foot utilizing a Solinst water level meter Ground water elevations in each well at the site were calculated by subtracting the measured depth to groundwater from surveyed casing elevations(Table 1) Ground water elevations were plotted and contoured on a scaled site map (Figure 3) ' After water levels were measured, approximately 8 to 10 gallons of ground water (a minimum of I three well-volumes per well) were removed from wells MW-1, MW-2, MW-4, MW-5, MW-6A, MW-613 and MW-7 utilizing a two-stage submersible pump Approximately 8 gallons of ground water] were removed from well MW-613 before being pumped "dry" Temperature, pH and conductivity were measured for stabilization at regular purge-volume intervals from each well using an ICM Model 52200 water analyzer Field data and logs are included with Appendix A Purged Advanced GeoEnvironmental,Inc I r Y 1 5