ARCHIVED REPORTS XR0006994 - Laserfiche WebLink

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i SITE BACKGROUND On Octobei 30 1991 Walton P (tomes FXL.i),.[tung Inc , of Rio Vista ( alltornta, excavated and removed three l 1S ] s ( I K I I K2 and I K3) trotn the site Ilu, USTs contained gasoline and diesel fuel A C ondor rLprCsentative was on site during the US F removal to collect soil Samples The field activities wore observed by C arol 0/ of the PAYEI ID A small hole was found ou the lower fill end of TK3 (diesel tank) Petroleum ,tanung acid odors werL noted in the soil beneath the fornner locations of the USTs Groundwater was not LnLoui)tLred during, the US7 removal Six soil samples were collected by Condor from the USI' excavation at ' dLpths of 9 to 12 lect hLle)w the ground surface dlie samples were analyzed for rPH-G (gasoline), 13lhX, TEPH (diesel) I-DI3 (ctlnvlcne dibromide) and total lead I,aboratory analyses indicated clLvated concentrations of 1 PH-(t 1 1 PH and f3 I LX uoiisfitucnts in the soil samples I or additional inforlriation rcler to lank full ' 1'rstu g Re%id1% prLpared h} ( ondor dated NOVLinber 18 1991 At the dit-L01011 ill Illi PHSIEIID Condor prepared a work plan to llncstlgate the ga',01111L and diesel Lontamination asu)LiatLd with the lot mer US Is (,Soil and Giountlivaler Investigation Work Plan, dated May 30 1995) 1 he work plaii was applovLd by tint, PHS/I till and the RLLlainatioln DistTiet#2029 On August 22, 1995 thrLC hydropunLll horcholes (HP-1, HP-2 and 11P-3) were drilled at the site (sec the figure ' attached to the back of Appendix B for boreholL locations) Ronald Rowe of the PHS/EHD was on site periodicall) to observe thL fieldwork Gilbert Cosio of Murray, Burns, and Kienlen LngmeLring was on site to observe the. drilling activities as a Reclamation District representative, Iwo of the hydropunch boreholes (HP-1 ' and HP-2) "LrL lo(-atLd on thL levee and were drilled to dLpths of apprriximately 16 and 1 1 feet hLIOW the top of the, ILvee (bt]) rLspi-LtivLIN111L third h)dropunL11 borehole (HP-3) was located below the levt_L and was dr111Ld to a depth of approxlmatLly (t feet bLlow ground surlaLL (bgs) Soil samples wLrc collected at live foot intervals (rroundwaler samples were L011LctLd usin- a Hvdropunch 11 proundttiatLr sampler (rasoline odors were noted in eaL11 horLholL I aboratory analysLs 1i1d1LatLd Ce111LLntrations of 1 P114t and BI I X in the soil and groundwater samples alla1viLd froirt LaLh horLholL (sec I ah1Ls 13 1 and 13 2, bLlow) ' TABLE B 1 Laboratory Results (soil-August 1995) B T L x TPH-G t'Ml Detection 50 1�0 50 50 1 0 10-10 %Ample 1 D Limits mg/kg mg/kg mg/log ing/kg mg/kg mg/kg 1432-1IPI-1[ f ) 1 200 3 100 5 500 22 000 300 190(du5cl) 1132-[11'2-11 (4) ND NI) 130 2800 22 ND 143241[13-5 5 61 68 5 2 91 75 16(dic11-1) 11otc The.last number in each sample.I l)sndtcates th+=dLp[h aI which fife satnpie was collected thin(omustnns Analttic,al m-,'k� parts Per million(ppm) BT1 X bLnLLne, toluene. Lthvl benLLn' and[Diel x)]ur's TP11-6 total pe.trnleum hydrocarbons quantified as gasoltnc TIP]]-total extractable petroleum hydrocarbons quantdied as dies'] motor oil and keroSLIX NO nuns detected al or above,laboratory detection omits N de.ieehon limits rare d due in gesolnu inhrr're.nce