ARCHIVED REPORTS XR0000700 - Laserfiche WebLink

Home Browse Search

Quarterly Report - November 1998 FLAG CITY CHEVRON 6421 Capital Avenue, Lodi, California 1.0. INTRODUCTION AND SCOPE OF WORK IAdvanced GeoEnvironmental, Inc (AGE) has prepared this Quarterly Report describing ground water monitoring activities performed during November-1998 at 6421 Capital Avenue (site), Lodi, I California The site setting is illustrated on Figure 1 Site structures and monitonng well locations are depicted on Figure 2 I 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, IServices - Environmental Health Division (PHS-EHD) and by the Central Valley Regional Water l Quality Control Board (CVRWQCB) for investigation of underground storage tank (UST) sites Background information and a descnption of prior investigations at the site was included in AGE's Closure Summary Report-April 1996, dated 28 April 1997 2 0. QUARTERLY MONITORING AND SAMPLING PROCEDURES On 10 November 1998,ground water monitoring and sampling was performed at wells MW-1,MW- 2 and MW-4 through MW-7 21- MONITORING WELL PURGE PROCEDURES Depths to ground water were measured from the top of each well casing at the 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 ground water from surveyed casing elevations (Table 1) Ground water elevations were plotted and contoured on a scaled site map (Figure 3) 4 t After water levels were measured, approximately six to eight gallons of ground water (a minimum of three well volumes per well) were removed (purged) from wells MW-1, MW-2 and MW-4 through MW-7 utilizing a two-stage submersible pump, the first two gallon`s were removed utilizing I a teflon bailer and new rope Approximately six gallons of ground water was purged from well MW- 6B 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 I data and logs are included with Appendix A Purged ground water was containerized in 55-gallon drums and was stored on-site in an area lacking general public access Advanced GeoEn%ironmental,Inc I u , r