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CO;NCLUS ION5 REGARDIW,, TEST RESULTS <br /> From these data it appears that the tank never leaked prior to <br /> removal and that all spilled material was recovereJ. One of the <br /> fuel lines from the tank to the boiler room might have leaked, <br /> and if it did, the contaminated area takes the form of a south- <br /> east plume between the railroad tracks and the warehouse. <br /> An alternate explanation could be that of casual surface spills <br /> along the railroad tracks. Such spill were probably common over <br /> the years in an industrial area such the port. The upper picture <br /> in Figure 7 shows a surface hydrocarbon spill of unknown origin <br /> that happened subsequent to both excavations. Heavy, diesel fuel <br /> using equipment can be seen in the background of both pictures <br /> in Figure 7 . <br /> At this time there is no evidence of groundwater contamination. <br /> Ione of the samples from the bottom of either excavation showed <br /> any contamination. <br /> However, the limits of the hydrocarbon contamination shown in <br /> the samples above have not been delineated and all of the <br /> contaminated soil probably has not been removed. <br /> RECO11%ENDAT IONS <br /> 1 . Bore Shand auger holes, about 4" in diameter, to a depth of <br /> 6 feet as shown on Figure 9. If a hand auger will not do the <br /> job, use an auger hole drilling, truck. A hand auger is sug- <br /> gested because of the hole depth and in order to reduce <br /> Cos t5 . <br /> 2. If a hand auger is used, collect samples by driving a 2" x <br /> 6" brass tube mounted on a long, "T" handle into the bottom <br /> of holes P- 1 through P-8. Have a representative from a cer- <br /> tified laboratory collect the samples, using all QA/QC de- <br /> scribed previously. If a truck mounted auger is used, take <br /> samples using 2 ' x 6 ' brass tubes mounted in a split spoon <br /> sampler . In either case, all sampling devices are to be <br /> cleaned between uses in a three wash and rinse, TSP indus- <br /> trial strength solution. If a hand drive sampler is used, <br /> take the samples Irom the bottom of the tube to ensure that <br /> debris which might fall into the hole will not contaminate <br /> the sample. A represntative of Hunter do Associates will be <br /> present to witness the drilling, and sampling procedures and <br /> to log the sample holes. <br /> 3. Fill the bore holes with grout , to he witnessed by the DHS. <br /> 4. Test the samples from P-I through P-5 for BTEX using EPA <br /> method....8.020__.._(p.rep•...5030)-, <br /> 7 <br />