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TANK No. 3 SOILS BORINGS/SAMPLING, Page 2 3 <br />'IONS <br /> ffering soil conditions were encountered in each boring in place be <br /> I on the attached boring logs. In general, the soils �diation is <br /> were typical of the silty clays predominating in the <br /> ous fuel oil contamination was observed from 17 ' -24 'BGS <br /> 2 . No apparent contamination was observed in boring B1 . iwater <br /> no soil conditions indicating preferential migration PPM <br /> Soil characteristics were uniform in both the vertical <br /> tal planes. additional <br /> itinue to be <br /> RESULTS: <br /> ie proximity <br /> s were obtained in a split spoon sampler fitted with 2" <br /> ass sleeves . Samples were sealed with foil lined caps <br /> pending transport to the analytical laboratory. Total tanks from <br /> iiydrocarbon (TPH) and BTXE analyses were performed ork will be <br /> PA method 8240/8260 (GC/MS) . .ly, we look <br /> arding this <br /> results were non-detectable for both soil samples from Eication as <br />►d for sample B1 -2 . Sample B1 -1 , from boring 1 , was <br />.ntain 700 PPM TPH but no BTXE. Chain of custody and <br /> boratory report forms are attached. <br /> tel oil contamination in soil under tank no. 3 . The <br /> Dn consists of TPH only, no BTXE was found. Based on <br /> actable analyses obtained from soil samples B1 -2 and B2- <br /> tion has not migrated deeper than 24 ' ( 12 ' below tank <br />�pth to groundwater under the site is approximately 60 ' <br /> scent deep borings made at the Caltrans yard across from <br />.ands) therefore, the threat to groundwater is slight. <br />.tal extent of contaminant migration is an unknown. <br /> ice no contamination was encountered in boring 2 at any <br />)pears horizontal contaminant spread is limited. No <br /> were encountered indicating horizontal migration is <br /> L in any direction. <br /> been removed from the tank. No further releases are <br /> Based on prevailing soil types and limited vertical <br /> migration to date, further horizontal or vertical <br /> migration is not expected. <br /> 8 d <br />