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Hf I'[7R1 Ar}dwonal \ail moi s.m.,nd.. +.r Im c,i,Fay.,n firn.iv,ti 11.In, L1.,<,n., 1p.clt.,n (A {h.n111, II 1_7 PaF•. -. 1*0 SITE BACKGROUND ' 0n October 30, 1991, Warren E. Gomes Excavating. Inc., of Rio Vista, California, excavated and removed three (3) USTs (TK1, TK2, and TK3) from the site (Figure 3. Appendix A). The USTs contained gasoline and diesel fuel. A Condor representative was on site during the UST removal to collect sail samples. The field activities %%ere observed by Carol Ur of the PHS/El-IF). A sniall hole Nvas found on the lower fill end of T0 (diesel tank). Petroleum staining and odors were noted in the soil beneath the former locations of the USTs. Groundwater was not encountered during the UST removal. Six (6) soil samples were collected by Condor from the UST excavation at depths of 9 to 12 feet below the ground surface (bgs). The samples were analyzed for TPH-G (gasoline), BTEX, TEPN I (diesel), EDB (ethylene dibromide), and total lead. Laboratory analyses indicated elevated concentrations of TPH-G, TEPN, and BTEX constituents in the soil samples. For additional information, refer to Tulrk Pzrll Tesling Results, prepared by Condor, dated November 18, 1991 . At the direction of the PHS/ElID, Condor prepared a .work plan to investigate the gasoline and diesel contamination associated with the former t:STs (.buil curl Grouncln•uter Investigation Work Plun, dated %lav 30, 1995). The work plan was approved by the Pl ISIEHD and the Reclamation District ;V2029. ' Oil Au_iaust 22, 1995, three (3) hydropunch boreholes (HP-1, HP-2, and HP-3) were drilled at the site (Figure 3. Appendix A). 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 (2) of the hydropunch boreholes (HP- I and HP-2) were located on the levee and were drilled to depths of approximately 16 and l I feet below the top of the levee (btl), respectively. The third hydropunch borehole (HP-3) was located below the levee and was drilled to a depth of approximately 6 feet below the ground surface (bis). Soil samples were collected at five (5) foot intervals. Groundwater samples were collected using a 1 Hydropunch 11 groundwater sampler. Gasoline odors were noted in each borehole. Laboratory analyses indicated concentrations of TPH-G and BTEX in the soil and groundwater samples analyzed frorn each borehole (see Tables 2.1 and 2,2, below). t� CONDOR