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EL RANCHO ROCK 8t SAND, INC. QUARRY <br /> INVESTIGATION REPORT <br /> SLAB-1 SITE <br /> PAGE 5 <br /> No contaminants were found at or above the specified detection limits by any of the analyses. <br /> The analyses did indicate, however, the presence of weathered gasoline at a concentration less <br /> than 2.5 mg/kg (ppm). <br /> TABLE 1 <br /> ANALYTICAL RESULTS <br /> Standard Detection Limits in Soil <br /> GeoAnalytieal Laboratories <br /> BTEX TPH-G TEPH Method Method Method <br /> Sample 5.0 2.5 8010 8270 LC50 <br /> µglkg mg/kg Diesel Kerosene Motor Oil 5.0 0.05 - >500 mg/1 <br /> 5.0 5.0 mgfkg 50 uglkg 0.25 <br /> mg/kg mg/kg mg/kg <br /> Al ND ND ND ND ND <br /> BI ND ND' ND ND ND <br /> C1 ND NDz ND ND no <br /> mortalities <br /> DI ND' <br /> Gas chromatography shows hydrocarbons indicative of weathered gasoline at a concentration less than 2.5 <br /> mg/kg. <br /> Heavier hydrocarbons present. <br /> Detection limits are elevated (50 µglkg) due to the presence of hydrocarbons in this sample.. <br /> 5.0 CONCLUSIONS AND RECOMMENDATIONS <br /> The presence of organic vapors in the area of Slab-1 was indicated by the unusual odor and <br /> recorded FID readings. Field measurements and observations indicate that perhaps 10 to 20 <br /> cubic yards of soil were contaminated with an organic compound. Laboratory analyses indicate <br /> that the organic compound involved is probably gasoline. <br /> The location of the apparent contamination is adjacent to the former site of a conveyor that was <br /> a part of the plant facilities. It is unlikely that a fuel storage tank was located in this area. <br /> Based on the data described above, we consider that this apparent contamination was probably <br /> caused by an isolated gasoline spill from a vehicle, or possibly from a paint thinner spill from <br /> %4 CONDOR <br />