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rel_ ENTRAL VALLEY REGIONAL WATER QUALITY CONTROL BOARD <br /> CASE CLOSURE CHECKLIST <br /> Leaking Underground Storage Tank Program <br /> • This checklist, CASE CLOSURE letter, and the Unauthorized Release Report Form (URF) is to be <br /> retained by the Regional Board and Local Implementing Agency as documentation of release and <br /> subsequent closure action. All files and reports will be placed on microfiche for review. <br /> I. Case Information <br /> LUSTIS Case No. Site Code: 1348 URF filing date 2125191 Closure date <br /> Site Name/county Unocal Service Station#6015 <br /> Site address 601 E. Kettleman Lane City Lodi Zip Phone <br /> Table I - Responsible Party Information <br /> Responsible party Name Address, City, Zip Phone <br /> Former Property Unocal Corporation 2000 Crow Canyon Place, Suite 400 510/277-2384 <br /> Owner San Ramon, CA 94583 <br /> Operator 1 <br /> II. Release and Site Characterization Information <br /> Tank size(s) 1 x 1 l n regular unleaded oline 1 x 10.000l n super unleaded gasgline, 1 x <br /> 10,0001 n diesel. 1 x 550 gallon waste oil Fuel type(s) Unleaded gasoline and diesel <br /> Chemical type(s) and quantity(ies) released TPH as gasoline. BTEX. Quantity of fuel release unkngwn_ <br /> Table H - Lateral and Vertical Extent of Contamination <br /> Environment Lateral (ft) Vertical (ft) Contaminant Concentration Range <br /> Soil Immediate 27.5 to 42.5 and TPH as gas., ND to 6.1 mg/kg <br /> vicinity of 60 to 74 benzene ND to 1.9 mg/kg <br /> S.E. corner of <br /> UST pit <br /> Groundwater Immediate First water TPH as gas., Currently ND <br /> vicinity of bearing zone benzene Currently ND <br /> UST pit <br /> Soil type at the site Well graded. sand and silt <br /> Source of drinking water under SWRCB POLICY 88-03 <br /> Were nearby wells (Domestic, Municipal, AG, etc.) monitored? Yes_ No x <br /> Wells affected (Domestic, Municipal, AG, etc.) None. _ <br /> Highest and lowest depths to groundwater 60.55 feet and 80.57 feet 1991 to present) <br /> Seasonal groundwater gradient(s) and direction(s) Gradient: 0.002-0.003: flow direction_SSE to SSW <br /> Name of Regional Water Quality Control Plan (Basin Plan) aquifer affected (see attached) <br /> San Joaquin Basin (513) _ <br /> Surface water impacted? Yes_ Nom <br /> Name of surface water body affected Not Applicable <br /> QC�i a yr D <br /> OCT 3 0 1995 <br />