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<br /> Quarterly Report First Quarter 2002 ;
<br /> 'Former HESS-DUBOIS CLEANERS,
<br /> r 348 We.st'Harding Way'
<br /> Stockton,California
<br /> a.. 1.0. INTRODUCTION
<br /> aAdvanced GeoEnviroiifiiental, Inc. (AGE)lids prepared this quarterly report.for 348,West Harding
<br /> ' Way, Stockton,Cal>forn>a.The;slte setting 15 illustrated on Figure L,Site structures and monitoring
<br /> ',well,locations.are. depicted:on.Figure 2. The;,objcctive of-the work.'was,.to monitor dissolved
<br /> petrolcum hydrocarbon concentrations in.ground water'and to `characterize ground water flow
<br /> direction and gradient_
<br /> This`report has been prepared in accordance with guidelines established by the California Regional.
<br /> Water Quality Control Board-Central Valley:Divisioh(CRWQCB)for investigation ofunderground.
<br /> storage tank(UST)sites.A summary ofprevious investigations at the site was included inAdditional''
<br /> Site Assessment and Ground Water Extraction Workplan, dated 29•December 2000, prepared by.
<br /> AGE. Analytical data forground water samples acquired to date is included in this report.
<br /> 2.0. QUARTERLY GROUND WATER MONITORING AND SAMPLING
<br /> On 04 February 2002, ground water monitoring and,sampling were performed at the site on wells•
<br /> MW=1 through MW-10. Ground water monitoring procedures for the site were outlined in Work
<br /> Plan Addendurri ForAdditional Ground Water Investigation, dated 15'November 1995,prepared by
<br /> AGE and approved by the PHS-EHD by permit.dated 07 December 1995, and conform to`ground ;
<br />' water monitoring guidelines issued bythe the San Joaquin County Public, Health Services -
<br /> Environmental Health Division (PHS-EHD). `
<br /> 2.1.. WELL MONITORING AND EVACUATION
<br /> On 04 February 2002, a Solinst water level meter was used to measure the depth to ground water in'
<br /> each well relative to the tops,-6f the well casings. The relative ground water elevation in each well.'. 1
<br /> and hydraulic gradient were determined from these,data(Table 1). 4
<br /> After ground water depths.were measured, a pre=cleaned, two-stage.submersible pump or.newr'
<br /> disposable,dedicated bailers were used to evacuate water,in wells MW-3 through MW-10. During
<br /> the October sampling,event; approximately $ to, 14 gallons of water(a minim
<br /> um.of three.casing- „
<br /> '. water volumes)'were removed from' each well:Temperature, pH and conductivity were measured'
<br /> at 1.5 to 3-gallon intervals using an Oakton water analyzer. Purged water was stored'in'55-gallon i
<br /> DOT-approved drums on-site:Monitoringwell stabilization data and-field data sheets are included
<br /> in Appendix A.
<br /> 1 ' IY' gl
<br /> I '.Advanced GeoEnvironmental,Inc.
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