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i <br /> ALTON GEOSCIENCE <br /> Quarterly Progress Report Summary Sheet <br /> First Quarter 1996 <br /> Former Mobil Station 04-343 San Joaquin County Site Code#: 1968 <br /> 540 East Grantline Road <br /> Tracy California <br /> Number of water zones: 1 This Page 1 <br /> FIELD ACTIVITY: Date Sampled: Jan.26,1996 <br /> Number of groundwater wells on-site: 8 Groundwater Wells monitored: 11 <br /> Number of groundwater wells off-site: 4 Groundwater Wells sampled: 11 <br /> Groundwater Wells with Free Product: 0 <br /> Phase of Investigation:Vadose Zone: Characterization Groundwater Phase: Monitoring&Sampling <br /> SITE HYDROGEOLOGY: <br /> Approximate depth to groundwater below ground surface: 11 <br /> Approximate elevation of potenliometric surface above Mean Sea Level: 20.5 <br /> Average increase/Dectcase in groundwater elevations since last sampling episode: no change <br /> Approximate flow direction and hydraulic gradient: North at 0.013 root per foot <br /> GROUNDWATER CONTAMINATION(BENZENE MCL=1.0 ppb): <br /> Wells containing free product: 0 Range in Thickness of Free Product: NIA <br /> Number of wells with concentrations below MCL: l I Volume of Free Product Recovered This Period: NIA <br /> Number of wells with concentrations at or above MCL: 0 Volume of Free Product Reovered To Date: NIA <br /> Range in Concentrations: Benzene:ND to D.77 ppb <br /> Nature of contamination: Diesel TPH-D: ND to 430 ppb <br /> ADDITIONAL INFORMATION: This site is currently being evaluated for potential for closure. An update will be provided <br /> in forthcoming quarterly progress reports. <br /> Prepared by: 4 ell Ailsa S Le May Alton Project No:30-0136 <br /> Geologist <br /> Approved by: Matthew W.Katen Submittal Date:Apr.26,1996 <br /> California RG#5167 Senior Geologist <br /> =: ..10434311.XLS <br /> ' f <br /> * N0.5167 <br /> I <br /> OF CAL�Fti <br />