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UST Removal Report and Request for Closure 3 The Southland Corporation,Store#17647,1049 Yoseaute Ave,Manteca,CA January 12,1999 ' Soil hydrocarbon concentrations from samples collected on December 4, 1998 were non-detectable for benzene, less than 5 mg/kg for TPH-g,and ranged up to 31 mg/kg MTBE Soil hydrocarbon concentrations were non-detectable mall of the samples collected on December 15, 1998. 5 0 WASTE DISPOSAL AND BACKFILL ' Approximately 450 cubic yards of soil generated during tank removal and construction of the new UST pit was removed from site by Belshire Environmental to a licensed waste disposal facility Formal disposal documentation will be forwarded to the SJCPHS when received Banks and their designated subcontractors oversaw UST pit backfilling and compaction 6.0 CONCLUSION AND REQUEST FOR CLOSURE Based on the summary of sod analytical data, residual hydrocarbons below the former UST area are restricted in lateral and vertical extent to the eastern part of the former UST pit at depths of about 14 feet below grade,and consist of TPH-g at about 1,000 mg/kg,with no benzene,and MTBE of less than 0 02 mglkg Low BTEX concentrations relative to TPH-g indicate probable ongoing intrinsic ' biodegradation,which is expected to continue Based on 1)the virtual absence of BTEX constituents in m-situ sods,2)the apparent limited lateral and vertical extent of residual hydrocarbons, 3) evidence of intrinsic biodegradation (which is expected to continue), 4) low-permeability soil types, and 5) hydrocarbon source removal (replacement of the USTs), no further action at this site is requested Site closure in accordance with low-nsk categorization following SWRCB policies is proposed upon SJCPHS review of this report I + I ' 1 I I I I Ir i I 11 I 17647ushph(S U) ' 1 I I I I I1 I II I V I f' 11 Ik i V I tl `pI I I ' ilii i Ir 1�1�1 ` 111'1 I I I 1 , I li ' ' k, r111 Igll 'll` I f 1 I I r r I i� I i i II i I II I I I t II I