Laserfiche WebLink
• <br /> BP Oil Facility No 11191 <br /> April 11, 1995 <br /> submitted for analysis. Because soil samples from the soil borings did not exhibit evidence <br /> of hydrocarbon impact (discoloration, hydrocarbon odor, positive PID reading), the bottom <br /> two samples from each boring were chosen for analysis Samples were submitted to <br /> Analytical Technologies, Inc (ATI) of Pensacola, Florida, a California-certified analytical <br /> laboratory (ELAP 111687) Soil samples from the soil borings were analyzed for Total <br /> Petroleum Hydrocarbons as Gasoline (TPHg) by Environmental Protection Agency (EPA) <br /> Method 8015, and for Benzene, Toluene, Ethylbenzene, and total Xylenes (BTEX) by EPA <br /> Method 8020 The four samples from the stockpile were composited prior to analysis, and <br /> were analysed for TPHg, BTEX, and total lead by EPA Method 6010. A copy of the <br /> chain-of-custody and ATI laboratory report is presented in Appendix C <br /> Petroleum hydrocarbons were not detected in the soil samples collected and analyzed from <br /> borings B-7 or B4, or from the soil sample collected and analyzed from 51 feet bgs in <br /> boring B-6. Benzene (4 parts per billion, or ppb), toluene (7 ppb), ethylbenzene (I ppb), <br /> and xylenes (6 ppb) were detected in the soil sample collected from 46.5 feet bgs in boring <br /> B-6 Concentrations of benzene and ethylbenzene detected in this sample are below the <br /> current LUFT Manual and Tri-Regional Guidelines minimum recommended reporting limit <br /> for these compounds of 5 ppb <br /> Petroleum hydrocarbons or lead were not detected in the composite stockpile sample <br /> SP-la,b,c,d <br /> CONCLUSIONS <br /> The vertical extent of residual petroleum hydrocarbons in the soil beneath the northwestern <br /> dispenser island appears delineated Low hydrocarbon concentrations were detected in the <br /> soil sample from 46 5 feet bgs in boring B-6, but were not detected in the sample from 51 <br /> feet bgs A previous investigation detected low concentrations of hydrocarbons in boring <br /> B-5 at 46 5 and 515 feet bgs, but not in the sample from 60 5 feet bgs. Additional <br /> delineation of the vertical extent of residual petroleum hydrocarbons in this area is not <br /> necessary or warranted <br /> The lateral extent of petroleum hydrocarbons beneath the northwestern dispenser island has <br /> been delineated to the northwest and the northeast Petroleum hydrocarbons were not <br /> detected ,in the soil samples from borings B-7 or B-8 Benzene and ethylbenzene were <br /> detected in the soil sample from boring B-6 at 46 5 feet bgs at concentrations below the <br /> current LUFT Manual and Tri-Regional Guidelines minimum recommended reporting <br /> limits Hydrocarbons were not detected in the soil sample from boring B-6 at 51 feet bgs <br /> 4300701-2 4 <br />