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CENTRAL VALLEY REGIONAL WATER QUALITY CONTROL BOARD <br /> �a 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 URF filing date 04/28/92 Closure date <br /> Site Name/county Former Unocal Bulk Plant #0950 San Joaquin Count <br /> Site address 2835 Navy Drive City Stockton Zip 95201 Phone Not Available <br /> Table I - Responsible Party Information <br /> Responsible party Name Address, City, Zip Phone <br /> Property Owner Port of Stockton P O Box 2089 2091946-0246 <br /> Stockton, CA 95201 <br /> Operator 1 Vacant Formerly P O Box 5155 5101867-0760 <br /> Unocal Corporation San Ramon, CA 94583 <br /> II. Release and Site Characterization Information <br /> Tank size(s) 20,000 gallons and 10,000 gallons Fuel type(s) _Diesel only <br /> Chemical type(s) and quantity(ies) released Diesel Gasoline-probabiy Gasoline-probablyfrom adjacent site <br /> Table II - Lateral and Vertical Extent of Contamination <br /> Environment Lateral (ft) Vertical (ft) Contaminant Concentration <br /> Range <br /> Soil 40ft in tank l lft in tank TPH as gasoline ND-2 2 mglkg <br /> Pit pit TPH as diesel ND-120 mg/kg <br /> Groundwater Unknown Unknown TPH as gasoline ND-14 0 mg/L <br /> TPH as diesel ND-4 0 mg/L <br /> Benzene ND-5 3 mg/L <br /> Soil type at the site _interbedded clayey silt silty clay and silt _ <br /> Source of drinking water under SWRCB POLICY 88-63 <br /> Were nearby wells (Domestic, Municipal, AG, etc ) monitored/ Yes_ No ✓ <br /> Wells affected (Domestic, Municipal, AG, etc ) None <br /> Highest and lowest depths to groundwater 5 37 feet-I 1 01 feet <br /> Seasonal groundwater gradient(s) and direction(s) Gradient 0 001 to 0 008, Variable ESE. WNW- <br /> WSW <br /> Name of Regional Water Quality Control Plan (Basin Plan) aquifer affected (see attached) <br /> Water table aquifer <br /> Surface water impacted? Yes_ No ✓ <br /> Name of surface water body affected Not applicable <br /> III. Soil Remediation Information <br /> Soil remediation method(s) Excavation of contaminated soil and proper disposal thereof <br /> Volume treated and/or removed _120 cu yds + 230 cu yds <br /> Contaminated soil disposal site Forward Inc and BFI Inc (approved Class III landfills) <br />