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it'll I u UV <br /> Quarterly Report .,Thirds Quarter 20421, <br /> • I" Former.HESS-DUBOIS'CLEANERS �I ' <br /> 348 West Harding Way,'Stockton; California <br /> 1.0. INTRODUCTION" <br /> r <br /> Advanced,GeoEnvironmental, Inc. (AGE)has prepared this quarterly report for 348 ,West Harding <br /> Way, Stockton, California. The objectives of the 'work 'were to monitor dissolved .petroleum <br /> -hydrocarbon-concentrations in ground water and to characterize ground water flow direction',and <br /> gradient. The site setting is illustrated on Figure 1;site structures and monitoring well locations.are <br /> depicted on Figure 2. : ; <br /> This report has been prepared iri accordance with guidelines establi`shed'by,the California Regional . . <br /> Water"Quality.Control Board Central Valley Division(CRWQCB)for investigation of underground , <br /> storage tank(UST)sites.A summary of previous investigations'at the site was included in the AGE- <br /> prepared'Additional Site Assessment and Ground Water Extraction Workplan,dated-29 December . <br /> 2000. Analytical data for ground water samples acquired to date is included.in,this report.. <br /> 2.0. PROCEDURES <br /> '.M On 18,September 2002, ground water monitoring and sampling were performed at .the site on <br /> monitoring wells MW-3 through'MW-10, and depth to water was measured at wells MW-1 and <br /> MW-2. Ground water monitoring procedures for the site were outlined in Work Plan Addendum For' <br /> Additional Ground Water Investigation, dated 15 November 1995,:preparedby AGE and approved <br /> by the Sanjoaquin County Environmental Health Department(EHD)by permit dated 07 December <br /> 1995, and conform to ground water monitoring guidelines issued by the EHD. <br /> WELL MONITORING <br /> 2.1 W AND EVACUATION'. - ., • , • ' .;' <br /> A Solinst water level meter was used to measure the depth to ound water in wells MW-1 through <br /> ep g t o gh <br /> MW-10 relative to the top of the well casing. The ground waterelevations and hydraulic'gradient <br /> ' at the site were calculated from this data {Table 1). ' <br /> After ground water depths were.'measured, a pre-cleaned, two-stage "submersible pump,or new <br /> disposable, dedicated bailers were used to evacuate water in wells MW-3 through MW-10. During <br /> the September sampling event,,approximately 9 to 12.gallons of water(a minimum of three casing-, <br /> water volumes)'were removed from each well. Temperature,-pH,'and conductivity were measured <br /> ' at 2-gallon intervals using an Oakton water analyzer..Purged water was stored in'55-gallon DOT- <br /> - <br /> approved drums on-site. Monitoring wellstabilization data and field ata.-sheets are included in - <br /> ' Appendix A. <br /> _ � r <br />