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CENTRAL VALLEY REGIONAL (NATER 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 <br /> to be retained by the Regional Board and ll Local <br /> Implementing and reports will be placedgency as on microfiche for <br /> tion of <br /> release and subsequent closure action p <br /> review <br /> I. Case Information <br /> LUSTIS Case no _ URF filing date Closure date <br /> Site name/county Tosco (Former Unocal) service Station #5417 / San Joaquin Count <br /> Site address j7 eilp- <br /> City Manteca ZIp j5336 _ Phone <br /> Table I-Responsible Party Information <br /> Responsible party <br /> Fume Address City,Zip Phone <br /> 1380 Lead Hill Rd, Ste 120 ) <br /> 77 <br /> Property owner Tosco marketing <br /> Operator 1 <br /> Operator 2 <br /> Operator 3 <br /> 11. Release and Site Characterization information <br /> Tank size(s) <br /> 10 000 Gallon Fuel type(s) Gasoline - <br /> Chemical type(s) and quantity(ies) released <br /> Table Il -Lateral and Vertical Extent of Contamination <br /> Environment <br /> Lateral{ft) Vertical(ft) Contaminant Concentration Range <br /> Sail 5 10 <br /> Benzene ND-48 mg/kg <br /> ND-0 51 mg/i <br /> Groundwater 50 Ben <br /> Soil type at the site—silty -sand, sand sandy sit <br /> Source of drinking water under SWRCB POLICY 88- <br /> Were nearby wells (Domestic, Municipal, Ag, etc ) monitored'? Yes No <br /> x <br /> Wells affected (Domestic, Municipal, Ag, etc ) NIA <br /> Highest and lowest depths to groundwater Highest=l2 79 Lowest=14 63 <br /> Seasonal groundwater gradient(s) and direction{sl North-Northwest <br /> x Name of Regional Water Quality Control Plan (Basin Plan) aquifer affected (see attached) <br /> San Joa uin <br /> SSurface water Impacted/ Yes No x <br /> Name of surface water body affected NIA <br />