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1 <br /> 1 <br /> S11E BACKGROUND <br />' ()n ()LtobLr 10 1991 WarrLn L (bines L-.Lavating, lit, of RIO Vista (-alitornia c,xe.avated and <br /> rclnnGLd Hiroo ( STs ( IK1 TK2 and TK3) from the Site t hL I,S 1 s c,ontamed gasoline and diesel <br /> hiLl ( ondor tepresentative was on site during the USI removal to L011eLt soil samples the <br />' fiLILI aLWides �i erL observed by (arol ()i of the PHS/1.714D N Small hole was found on the <br /> lowLr til( irnd of I K 3 (diestl tank) Petroleum staining and odors were noted to the soil beneath <br /> flit toiMLr locations of the [,STS (MAl11dwate1 was not LnLountered during the LIST removal <br />' Sir soil samples were uilleLted by ( ondor from the ( S f exLavation at depths of 9 to 12 feet <br /> bClow the, ground surtacc 111L samplLs were ana]N/ed for 1-1'11-6 (gasoline) BILX FLPII <br /> (diLSLI) 1 D13 (eth) lent, dthromtde) and total lead I aboratory analyse~ indiLated e[Lvated <br />' Lonccntrations of 1 P1I-(i 11 PH and B I EX constituents in the soil samples For additional <br /> informaliori refer to lank Pidl Testin�, Ree irlts prLpared by (ondor datLd November 18 1991 <br />' At lhL dirLcttori of thi. PHS/LHD Condor prepared a work plan to investigate the gasoline and <br /> diesel Lontainmation associated with the former LIS 1's (Soul and('roundwater Investigation Work <br /> Plan, dated May 30 1995) 1 lie work plan was approved by the PHYME) and the Reclamation <br /> I)istrict #2029 <br />' On ALigLIst 22 1995 three hydropunch boreholes (IIP-I 11P-2, and HP-3) were drilled at the site <br /> (see the figure attached to the back of Appendix B for borehole lo(,ations) Ronald Rowe of the <br />' PHS/1 I ID was on site periodically to observe the fieldwork (filbert ( osio of Murray Burns and <br /> I<ILn[Ln 1 ngincering was on site to observL the drilling activities as a Reclamation District <br /> rLpresentative f wo of the hydropunch boreholes (HP-1 and fIP-2) %sere located on the levee, and <br />' werL drilled to depths of approxtmately 16 and 1 i feet below lhL top of the levee (btl), <br /> respectwLly [he third hydropunch borLhole (I3P-3) was located below the levee and was drilled <br /> to a depth of approximatL[v 6 tett below ground Surface (bgs) Soil samples were LolleLted at <br />' live foot intervals (lroundwater samples wLrc collected using a hydropunch I1 groundwatt.r <br /> samplLi (tasohne odors were noted in LaLh borLholL laboratory analyses indicated <br /> concentiations of l PI-14i and [3TLX in the soil and groundwater samples analyzed from each <br />' borLhole (see Tables B l and 13 2, below) <br /> TABLE B 1 <br />' Laboratory Results (Soil - August 1995) <br /> B T E x TPH-G TEPH <br />' Detection 50 50 so 50 1 0 10-10 <br /> Sample I D Limits mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg <br /> 1432-IfPI ll (d) l 200 3 100 5500 22000 300 190(dif-SLI) <br />' 1432-HP2-11 (9) ND ND 130 2 800 22 ND <br /> 1432-HP3-5 5 61 68 5 2 91 75 16(diesel) <br />' \ntL I-lie last number in each sample 1D indicates the depth at which the sample was collected <br /> I. nit( onversions Analytical <br /> mgikg parts per null ton(ppm) B1 EX=benzene toluene ethyl benzene and total xylenes <br />' TPH-G-total petroleum hydrocarbons quantitted as gasoline <br /> 1 LPH- 10tal extractable petroleum hydrocarbons quantitit d as <br /> diesel motor oil <br /> and Lero�ene <br />' ND none detected at or above laboratory detection limits <br /> d -dLtL(,tLOn lnnits raised due to gasoline mterterwCL <br /> 1 <br />