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Y , <br /> ALTON GEOSCIENCE <br /> Quarterly Progress Report Summary Sheet <br /> Third Quarter 1996 <br /> Former Mobil Station 04-343 San.Joaquin County Site Code#: 1968 <br /> 500 East Grantline Road <br /> Tracy California <br /> Dumber of water zones: 1 'this Page 1 <br /> FIELD ACTMTY: Date SangAe& 7125196 <br /> Number of groundwater wells on-site: 8 Grouadwater Wells monitored: 12 <br /> Number of groundwater wells off-site: 4 Groundwater Wells sampled: 11 <br /> Groundwater Wella with I=product: 0 <br /> Phase of Investigation:Vadose Zone: NIA Groundwater phase: Monitoring&Sampling <br /> SITE HYDROGEOLOGY: <br /> Approximate depth to groundwater below ground surface: 10.9 feet <br /> Approximate elevation of potentiometric surface above Mean Sea Level: 20.9 feet <br /> Average IncreaselDeerease in groundwater elevations since last sampling episode: 0.4 foot increase <br /> Approximate flow direction and hydraulic gradient: North of 0.015 foot per foot <br /> GROUNDWATER CONTAMINATION(BENZENE MCL-1.0 ppb): <br /> Wella containing free product: 0 Range its Thickness of Free Product: `N/A` <br /> Number of wells with concentrations below MCL: 11 Volume of Free Product Resoverod This Period: NIA <br /> Number of wells with concentrations at or above MCL: 0 Volume of Fret Product REcovmrA Tn bate: NIA <br /> Range in Conoentrations: Benzene:ND <br /> Nature of contamination: Diesel t TP11 b: -M to 350 ppb <br /> ADDITIONAL INFORMATION: Monitoring well AW-11 is obsbuctod at 9l5'feet below graft. <br /> Prepared by: Ailsa S Le May Alton Project Flo:30-0136 <br /> GealoglsC'""' <br /> Approved by: Matthew W.Kitten Submittal Date.10110!96 <br /> California RG#3167 SemionGrologkt <br /> 4 <br /> # NO.5167: <br /> rr, ._4t34313.XLS <br />