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i SITE BACKGROUND On Octobci 30 1991, Warren 1, Gomes Excavating, Inc , of Rio Vista, Calitornia, excavated and removed three US 1 s (1 Ki TK2 and IK3) from the site The USTs contained gasoline and diesel tuel A Condor representative was on site during the IJST removal to collect soil samples the Feld activities Wert, observed by Carol 0z of the PIIS/EI lD A small hole was found on the lower fill end of IK3 (diesel tank) Petroleum staining and odors were noted in the Soil beneath the former locations of the USTs Gioundwater was not ' encountered daring the IJST removal Six soil samples were collected by Condor from the UST excavation at depths of 9 to 12 feet below the ground surface The samples were analyzed for I PH-G (gasoline) BT EX, I FPH (diesel), I DB (ethylene dlbromid,-), and total lead Laboratory analyses indre.ated elevated eonee,ntrations of TPH-(i TFPH and BTEX constituents in the, soil samples lot additional information, refer to Tank Pull Ie sling Ro%zd1� prepaicd by C ondor dated November 18 1991 At 111e direction of the PIISIEHD, Condor prc,parcd a work plan to investigate the gasoline, and diesel contarnrnatton associated with the former IJSTs (Sort ural(rroun(lwafei Inveclrgation Wotk Pkn7, dated May 30, 1995) I he work plan was approved by the P14S/LHD and the Reclamation District 42029 ' On August 22, 1995, thrcr. hydropunch boreholes (HP-1, HP-2, and HP-3) were drilled at the site (see the figure attached to the back of Appendix B for borehole locations) Ronald Rowe of the PHS/EHU was on site ' periodicaily to observe the fieldwork Gilb(.rt Costo of Murray, Burns, and Kienlen Engineering was on site to observe the drilling activitu.s as a Reclamation District represcntatiN e Two of the hydropunch bon.holes (HP-I and HP-2) wLrc located on the levee and were drilled to depths of approximately 16 and 1 1 feet below the top of ' the lcvec (btl), respeetivel-y the third hydropunch borehole (I IP-1) was located below the leve(. and was drilled to a depth of approxtmaicly 6 tc(t below ground surface (bgs) Soil sample,, were enllected at five foot intervals Groundw.14Lr sani pies -,pert- collected using a Ilydropumh II groundwater sampler Gasoline odors were noted in each borehtllc 1 aboratory analyses indicated concentrations of F'Pl l-(i and B i EX in the soil and groundwater samples analy/cd from caeh borehole (tic(. Tablt_% B 1 and B 2, belo%N) ' TABLF B.1 Laboratory Results (Soil-- August 1995) ' B T E X TP11-G FEPH Detection so 50 so 50 10 10-10 ' Sample i D l Imits mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg 1 i32-3I]'1 1 1 (#1 1 20U 3 100 5,500 22 000 300 190(diest l) 1432-111.2-11 (H) NY) ND 130 2 800 22 ND ' 11432-11P3-5 5 61 (18 5 2 91 7 5 16(diesel) ' Note The,last number in each sample it)indicates the.depth at which the sample w&s collected Unit(onvarsiom Analtitical mg/kg parts pe.r mellia,n(ppm) BTEX hLFlLLne talncne, ethyl bLnicne and total xylene,-, ' TPI I-(j—total pe.trole,um hydrocarbons quantified ds gasoline TI-Pii total extractable pLtrnlcum hydrocarbons quantified as dit,u l motor oil and kt roscnL NI)=none detecta.d at or above.laboratory ClUct,tion limits H dcicction limits raist.d dui,to gasolint,tnterferen" 1