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1 s '. ✓ i'f'- +y� ! ' i I. Y Jls� ' � '4.l. "r'' i 1.- 7 -� � ' 't I' <br /> r r <br /> it <br /> .:Quarterly-.Report , Secorid,Quiirter 2003 <br /> "j '`Fornner,HESS-DuBOIS'CLEANERS <br /> 1 < v i <br /> €E 348 West I3ardirig Way, Stockton;'Californla' ' <br /> L0. , INTRODUCTION.' _ <br /> Advanced GeaEnvironmental,Inc. (AGE)has prepared this quarterly report for'348 West Harding <br /> way; Stockton,5'California The objectives of the.work were to'monitor,dissolved petroleum.` ' }• <br /> hydrocarbon concentrations'm'ground water and to characterize ground water,flow'direction'and" . <br /> gradient..The site setting is'illustratedon Figure L'The site structures and monitoring well locations <br /> are depicted on Figure 2:' <br /> This report has been preparcd-in accordance With'guidelines established by the California Regional <br /> #Water Quality Control Board-Central Valley Division(CRWQCB)for investigation'of underground ' <br /> storage tank([JST}sites.A summary of previous investigations at the site was included'in the AGE- <br /> prepared`Additional Site Assessment:and,Ground Water Extraction Work Plan,dated 29 December <br /> .2000.Historical information for the site is included in Appendix A:Analytical data,for ground water <br /> samples acquired to date is included in this report. <br /> •:'2.0. PROCEDURES <br /> _On 20 May 2003, ground water monitoring and sampling were performed at thesite on monitoring <br /> wells.MW-3 through MW-10,and depth tovater was gauged in monitoring wells MW=1,arid MW-2. <br /> Ground water monitoring procedures for the site were outlined in AGE's Work Plan Addendum For' <br /> Additional'Ground Water Investigation, dated 15 November.1995.The work plan was approved by <br /> the San Joaquin County Environmental Health Department(EHD),by permit,on 07 December 1995, • <br />'.'. and,conformed to ground water monitoring guidelines issued by the EHD: <br />"' . 2 1• WELL MONITORING AND PURGING <br /> �A Solinst water level nieter was used to measure the depth.to ground water in'wells MW-1 through <br /> °MW-10'relative to the to 'of the.'Well casing. The'ground water elevations and hydraulic gradient <br /> 4i the-site were calculated'from:this data(Table 1). <br /> .' . <br /> After groundwater depths were measured;pre-cleaned,dedicated bailers was used to evacuate water . <br /> .:,in wellsMW-3 through MW=fO;During the May 2003 sampling event, approximately 10 toll <br /> gallons, of water (a'minimum of three:casing-water volumes):were removed frorrl each well. , <br /> :Temperature, pH and conductivity;were measured.at 3-gallon.intervals using.an.Oakton water . <br /> 'analyzer. Purged'water was stored in 55-gallon.DOT-approved drums on-site: Monitoring well <br /> ' stabilization,data and field data.sheets are included in Appendix Bi.; <br /> ' Advanced GeoEn'vironmentai;Inc.I es <br />