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ALTON GEOSCIENCE <br /> Quarterly Progress Report Summary Sheet <br /> Fourth Quaiter 1995 <br /> Former Mobil Station 04.343 San Joaquin County Site Code q 1968 <br /> SOD East Crantline Road <br /> Tracy California <br /> Number of water zones: 1 This Page 1 <br /> FIELD ACTIVITY: Date Sampled: Oct.24,1995 <br /> Number of groundwater wells on-site: 9 Groundwater Wella monitored; I I <br /> Number of groundwater wells off-site: 4 Groundwater Wells sampled: I I <br /> Phase of Investigation: Monitoring Groundwater Wella with Free Product: 0 <br /> Groundwater Phase: Quarterly Monitoring <br /> SITE IIYDROGEOLOGY: <br /> Approximate depth to groundwater below ground surface: 11 <br /> Approximate elevation ofpotentiometric surface above Mean Sea Level: 20.5 <br /> Average Inerease/Dccrease in groundwater elevations since last sampling episode: no change <br /> Approximate flow direction and hydraulic gradient: North at 0.013 foot per root <br /> GROUNDWATER CONTAMINATION(BENZENE MCL-1.0 ppb): <br /> Wells containing free product: 0 Range in Thickness of Free Product: NIA <br /> ]lumber of wells with concentrations below.\ICL; 12 Volume of Free Product Recovered This Period: N/A <br /> Number of wells with concentrations at or above MCL: 0 Volume of Free Product Rto%x=d To Date: NIA <br /> Range in Concentrations: ND to 330 ppb(TPII-D) <br /> Nature of contamination: Diesel ND to 0.51 ppb(Benzene) <br /> ADDITIONAL INFORMATION: N/A <br /> Prepared by: Ailsa S Le May {�� Alton Project No:30.0136 <br /> Geologist C9r w <br /> Approved by: <br /> ]Matthew W.Katen <br /> V&!� � <br /> Submittal Date:Jan.24,1996 <br /> California RG!1 5167 Senior Geologist # on 5167 <br /> 0434310NIS <br />