ARCHIVED REPORTS XR0002677 - Laserfiche WebLink

Home Browse Search

i 1 y• 4 :,Quarterly Report ip 5econd1 Quarter 2002,'. ' r Former HESS-DuBOAS-CLEANERS a 348-West Harding,Way 4• Stockton, California , 1:0:.. . INTRODUCTION Advanced GeoEnvironmental, Inc. (AGE),has prepared,this quarterly report for,348 West Harding Way, Stockton;.California. The.objectives of,the,work were to monitor dissolved petroleum ; r hydrocarbon concentrations in ground,water and to characterize ground water flow direction and gradient.,The site setting is'illustrated'on Figure 1, site structures.and'monitoring Well.lo cations are r. depicted on-Figure,2. ' This,report has'been prepared in accordance'With guidelines established by'the California Regional Water Quality Control Board-Central Valley Division(CRWQCB)for investigation of underground story e tank UST sites. A summary of previous investigations at the site was included in the AGE prepared (UST) n 'Y prepared Additional Site Assessment and Ground Water•:Extraction'Workplan, dated 29 December. 2000. Analytical data for ground water samples acquired to date is included in this report.-. 1 2.0. , PROCEDURES On 12 June 2002, ground water monitoring and sampling were performed at the site on monitoring ' wells-MW-1 through MW-10. ,Ground water monitoring procedures for the site were outlined in Work Plan Addendum For Additional Ground Water Investigation, dated 15.November 1995,, prepared by AGE and approved by the SanJoaquin County Environmental Health Department(EHD) ' by permit dated 07 December 1995,�and conform to ground water monitoring guidelines issued by the EHD. '. '. 2.L' WELL MONITORING AND EVACUATION ' • ,.AS�olinst•Water-level meter was used to measure'the de th to �ound vvater-in each well relative:to' r P r - ..r .-. the top'of the well casing. The ground water elevations and hydraulic gradient at the site-were calculated from'this data (Table 1). After ground water depths were measured, a-pre-cleaned; two-stage submersible pump or.new disposable, dedicated bail&r were used to evacuate water in wells MW-1.'through_MW,10. During the June sampling event, approximately 7 to'14 gallons of water•(a minimum of three casing-water volumes) were removed from each well, Temperature,pH and conductivity were measured at 1.5 to 3-gallon intervals using,an Oakton water analyzer._,Purged water was stored in, 55-2allon DOT approved-drums on-kte. :Monitoring well stabilization data and field data sheets'are included in •, Appendix A;' ; Advanced GeaEnvironzneRta4 Inc.