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Attaclunent 1 <br /> tSale of cahforma Stag Waxer ite.ouree(ontrol Ho rid <br /> Emv[+nmrntal Prnlec4on Agr_nc} <br /> (Nex 12/vn) <br /> Underground Storage Tank Cleanup Fund <br /> CASE REVIEW FORM <br /> Date 5/14197 LUSTIS File No Over%ight Agency San Joaquin County Health Department <br /> Site Name/Address Unocal 2559Responsible Parties Address Telephone No <br /> 1665 Pacific Avenue Unocal Corporation P O Bo\5155 (510)277-2334 <br /> Stockton California Attn Mr Bob Boust San Raman CA 94583 <br /> I CASE INFORMATION(N/A=Not Applicable) <br /> Tani.No Size iii Gallons Contents Closed Iii-Place/Removed? Date <br /> 1 10 000 Super Unleaded Gasoline Removed 03/29/88 <br /> 2 10,000 Regular Unleaded Gasoline Removed 03/29/88 <br /> 3 550 Waste Oil Removed 03/29/88 <br /> M SITE CHARACTERIZATION INFORMATION(GW=groundwater) <br /> GW Basin Eastern San Joaquin County Beneficial Uses All Depth to Dnnkmg Water Aquifer Pump at 160 feet in closest municipal well <br /> Distance to Nearest Municipal Supply Well Distance Between Known Shallow GW Contammation&Aquifer <br /> 900 feet north >20 feet <br /> GW Highest Depth 30 11 CSW Lowest Depth 55 33 Well Screen Interval 19-60 feet Flow Direction East-northevst <br /> Soil Tvpe Silt and silty sand Maximum Depth Sampled 60 feet <br /> III MAXIMUM DOCUMENTED CONTAMINANT CONCENTRATIONS-Initial and Latest -=Not Reported, ND=Non-Detect <br /> Con;tminant Soil(mg/kg) Water(lig//L) Contaminant Soil(mg/kg) Water(pg/L) <br /> Initial(Year) Latest(Year) Initial(Year) Latest(Year) Initial(Year) Latest(Year) Initial (Year) Latest(Year) <br /> 1998 1997 1988 1997 1988 1997 1988 1997 <br /> 582 N/A 99,000 110000 Ethvlbenzene 1040 N/A 5,000 4,100 <br /> TPH(D(ecei) N/A NIA N/A N/A 1910 NIA 25 000 20 000 <br /> Benzene 060 N/A 5 700 1,500 MtBE NIA N/A N/A ND <br /> Toluene 6 50 N/A 48 800 29 000 Other N/A N/A I N/A I N/A <br />' IV SOIL REMEDIATION <br /> Method Excavation and soil vapor extraction Duration of Remediation SVE Jan-Oct 1996 <br />' V GROUNDWATER REMEDIATION <br /> Method None Duration of Remediation <br />' VL FREE PRODUCT <br /> Was Free Product Encountered? Yes O NoHes Free Product Been Totally Recovered? Yes No[= NIA <br /> When Was Free Product Recovery Project Completed? N/A <br />' VII RECOMMENDED ACTION <br /> Soil Closure Only? Yes= Nol Xr Case Closure? Yes= No= Solvent Case? Yes O Nor, <br />' Additional Action Required(i e,additional site assessment remediation,monitonitg) None <br /> VIII JUSTIFICATION FOR RECOMMENDED ACTION <br /> Site fully dstiessed Plume stable No MtBE No water-suppiv wells within 750 feet No remaining petroleum saturated soil <br /> fee product in anv wells <br />' 3100406AIUSTFUND XLS (REV 6710197) <br />