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c - C. . _ '.Quarterly Report -.First Quarter 2005 STRONG PROPERTY _ 5157-W6t Business Loop.Z05,Tracy,-California Y _ '1.0..- INTRODUCTION. . , .fir ~ 9 At the request-of Messrs. Robert and Mike Strong,Advanced GeoEnvironmental, Inc. (AGE) has _ prepared this-quarterly report for.the property located,at-5157 West Business Loop:2059 Tracy, I p of work included-the performance of a quarterly ground water monitoring Callfartna..The scope p event and preparation of this report.-The site.and the surrounding area are illustrated on:Figure 1. Structures and monitoring well locations are illustrated-,on Figure 2.Quarterly monitoring data from .. . July.1998 to the present is summarized in the tables.-of this report. Historical site investigation - information is summarized.in Appendix A. GeoTracker confirmation.pages of the submitted depth to water and.laboratory electronic deliverable fonnat (EDF) files are.included.in Appendix B. . 2.0. . PROCEDURES y On26 March 2005,twelve rrionitoring wells(MW-1 through MW-12)arid two domestic water wells (DW5157 and DW5055) were purged and sampled. All field work.procedures and reporting . requirements are in accordance with guidelines issued by the Central Valley Regional Water_Quality #~ Control Board(CVRWQCB)for subsurface°investigations.of underground storage tank(UST)sites r' and uidelines-issued b San Toa uin Couri •Environmental Health Department(EHD}far sampling =• " g Y q - tY _ - of ground water monitoring wells. 2'.1. WELL MONITORING AND PURGING On-26 March 2005;monitoring wells MW-1 through MW42 and domestic water wells DW5157 ; - -and DW5055 were purged and sampled A Solinst-water level meter was used to measure the depth to groundwater to the nearest 0.01=foot in the twelve monitoring well relative to the tops of the well casings. The ground water elevations and gradient were determined from these.data{TableWSW After recording water level,measurements, new disposable_plastic bailers were:used to purge each.' monitoring well of standing water.Between 4 and 7.5,gallons ofwater(a mitumum of 3 casing-water volumes per well)were removed from each well.-Ground water temperature,pH and conductivity r}' were measured,at'regular intervals during purging using an Oakion water analyzer.. To purge DW5157 and DW5055, a hose:bib was opened on the water storage tank. The pump-was allowed... to cycle on and off for approximately 15 minutes,--,Field'sheets and data are included in Appendix C. Purged water was stored on-site in labeled,55-gallon'Department of Transportation-(DOT)-approved " drums. " - _. Advanced GeoEnviroumental,Inc.