ARCHIVED REPORTS XR0006988 - Laserfiche WebLink

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SITE BACKGROUND i On October 30 1991 Warren L Gomes f-xcavating, Inc , of Rio Vista California, excavated and removed three I (IST, (7 K I, I K2 and I-K3) from the site The 11S1 s contained gasoline and diesel fuel A Condor representative was on site during the L5T removal to collect soil samples The field activities were observed by Carol O/ of the PHS/E1113 A small hole was found on the lower fill end of TK3 (diesel tank) Petroleum staining and odor, were noted in the soil beneath the former locations of the USI s Groundwater was not encountered during the (✓S I removal Six soil samples were collected by C ondor from the tJST excavation at depths of 9 to 12 lect below the ground surface l-he samples were analyzed for TPH-G (gasoline), BTFX, TEP11 (diesel), FDB (etlivlene dibromide) and total lead laboratory analyses indicated elevated concentrations of TPH-G, FFPH and B I1,X i.onstituents in the soil samples l'or additional information, refer to funk Pull feviing Revulty prepared by Condor, dated November 18, 1991 At the direction of the PHS/FHD Condor prepared a work plan to investigate the gasoline and diesel contamination associated with the former I.S I s (Soil and (-,roundwuter Investagalion Work Plan, dated May 30, 1995) ['he work plan was approved by the PHS/EFID and the Reclamation District#2029 On August 22, 1995, three hydropunch boreholes (HP-1, HP-2, and ITP-3) were drilled at the site (see the figure attached to the back of Appendix B for borehole locations) Ronald Rowe of the PHS/EFfD was on site periodically to observe the fieldwork Gilbert Casio 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 HP-2) were located on the levee and were drilled to depths of approximately 16 and 1 I feet below the top of the levee (bt]), respectively The third hydropunch borehole (HP-3) was located below the levee and was drilled to a depth of approximately 6 feet below ground surface (bgs) Soil samples were collected at five foot intervals Groundwater samples were collected using a Hydropunch Il groundwater sampler Gasoline odors were noted in each borehole I aboratory analyses indicated concentrations of TPH-G and B I-X in the soil and groundwater samples analyzed from each borehole (see 3 ables B 1 and B 2, below) ' TABLE B 1 Laboratory Results (Soil - August 1995) ' B T E X TPH-G TEPH Detection 50 50 50 50 l 0 10-10 ' Sample I D Limits mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg 1432-HPI-1 1 (9) 1 200 3 100 5 500 22 000 300 190(diesel) 1432-IIP2-1 1 (9) ND ND 130 2 800 22 ND 1432-t1P3-5 5 61 68 52 91 75 16(diesel) ' Note The last number in each sample ID indicates the depth at which the sample was collected Unit Conversions Analvtical ' mg/kg parts pcx million(ppm) BTFX—benzene toluene ethyl benzene and total xylenes TPH-G—total petroleum hydrocarbons,quantified as gasoline TEPH-total extractable petroleum hydrocarbons quantified as diesel motor oil and kerosene ND—none detected at or above laboratory detection limits ' #—detection limits raised due to gasoline interference I