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i ' SITE BACKGROUND On ()ctobEr 30 1991, Warren E Gomes Excavating Inc , of Rio Vista, California, excavated and removed three ' 1-�STs (-1 K1 1 K2 and TK')) from the site The USTs contained gasoline and diesel fuel A Condor representative was on site during the UST removal to collect sol] samples The field activities were observed by Carol Os of the PHS/EHD A small hole was found on the lower fill end of TK3 (diesel tank) Petroleum ' staining and odors were noted in the soil beneath the former locations of the USTs Groundwater was not encountered during the 17ST removal Six soil samples were collected by Condor from the UST excavation at depths of 9 to 12 feet below the ,round surface I he samples were analyzed for TPH-Cr (gasoline), BTFX 1 EPH (diesel) l,D13 (ethylene dibromide) and total lead Laboratory analyses indicated elevated concentrations of I PH-(1, I 1 PH and Fd constituents in the soil samples I or additional information refer to Tank full TeitinV Re6ulls prepared by C ondor dated November 18 1991 kt the direction of the PHS/EHD Condor prepared a work plan to investigate the gasoline and diesel Contamination associated with the former US rs (Soil and(groundwater Investigation Work Plan, dated May 30, I1995) 1 lie work plan was approved by the PIIS/EHD and the Reclamation District#2029 On August 22 1995, three hydropunch boreholes (IIP-1, HP-2, and HP-3) were drilled at the site (see the figure attached to the bat k of Appendix B for borehole locations) Ronald Rowe of the PHS/EHD was on site periodically to observe the fieldwork Gilbert Cosio of Murray, Burns, and Kienlen Engineering was on site to observe the drilling activities as a Reclamation District representative Two of the hydropunch boreholes (HP--1 and IIP-2) were located on the levee and were drilled to depths of approximately 16 and 1 1 feet below the top of the levee (btl) respectively Mlle third hydroptinch borehole (IIP-3) was located below the levee and was drilled to a depth of approximately 6 feet below ground surface (bgs) Soil tramples were, collected at five toot intervals I • (,roundwater samples were collected using a I lydropunch I1 groundwater sampler Gasoline odors were noted in each borehole 1 aboratory analyses indicated concentrations of FPH-G and H FEX in the soil and groundwater samples analysed from each borehole (set, fables H 1 and 13 2, below) TABLE B 1 Laboratory Results (Sail - August 1995) B T E X TPH-C TEPH Detection 50 so 50 50 10 10-10 Sample I D Limits mg/kg mg/kg mg/kg mglkg mg/kg mg/kg 1432-11131-1 ; (4) 1200 3 100 5 500 22 000 300 190(diesel) 1432-ItP2-1 1 (4) ND ND 130 2 800 22 ND 1432-HP3-5 5 61 68 52 91 75 16(diesel) mote Tht last number in tach sample 1D indicates the dtpth at which the sample was collected I nit Conversions Analytical mg/kg parts per million(ppm) $TFX -benzene toluene ethyl benzene and total xylenes TPH-(1=total petroleum hydrocarbons quantified as gasoline TFPH total extractable petroleum hydrocarbons quantified as diesti motor oil and kerosene I ND none detected at or above laboratory detection limits 4 - detection limits raised due to gasoline intirterence