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ALTON GEOSCIENCE <br /> Quarterly Progress Report Summary Sheet <br /> Fourth Quarter 1996 <br /> Former Mobil Station 04-343 SP Joaquin county <br /> Site CP&0: 1963 <br /> 500 East Grantline Road s <br /> Tracy California <br /> Number ofwater zones: <br /> FIELD ACTIVITY: Date Sampled ,.. 111151$61 <br /> Number of groundwater wells on-site: 8 Groundwater.WdU monitored: 1� <br /> Number of groundwater wells off-site: 4 Okra dtvater Welk p14- 11 <br /> Cdlenitel W` area Prod+act; Q <br /> ...,:. <br /> Phase of investigation:Vadose Zone: NIA GMmdyin> 'P arc 11 owtoring&Sampli all <br /> SITE HYDROGEOLOGY: <br /> Approximate depth to groundwater below ground surface: 10.8 stat: <br /> Approximate elevation of potentiometric surface above Mean Sea Level: ! z0.$feet <br /> Average Increase/Decrease in groundwater elevations since last sampling episode: 44 64 del3rwµlp <br /> Approximate now direction and hydraulic gradient: IST ptllil•[ocrt per fopt <br /> GROUNDWATER CONTAMINATION(BENZENE MCL-1.0 ppb): <br /> Wells containing free product: 0 Range in Two of Free Product; N/A <br /> Number of wells with concentrations below MCL: 11 Volume of Fieefroduct*=jvatd This,Period: .s, K/A <br /> Number of wells with concentrations at or above MCL 0 Volume of a Produd Repoveied To Date: KIA <br /> Range in Concentraii rls: Blm11if1e:ND <br /> Nature of contamination: Diesel 1 $6,310"b <br /> ' •Ea� rS°ci 7" : <br /> ADDITIONAL INFORMATION: <br /> Monitoring well AW-11 is obstructed at 9.65 feet below grade. <br /> Prepared by. /'"a'R: [arisCal%—m Albxt Project Na'3R�0136 <br /> staff Goo1st <br /> p ppro—1 by. Matthew W.Katen SubmittalLlaLo 1f10/47 <br /> California RG#5167 Senior Geologist <br /> SERA GEp� <br /> * <br /> .5167 x <br /> �OF CAL�F� <br /> i <br /> nX..1t1434314.XLS <br /> I <br /> I <br />