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Section 6 <br /> CONCLUSIONS <br /> The following conclusions are based upon the results of this subsurface investigation at the Thornton Gas <br /> Dehydrator Station: <br /> 1. The subsurface soils consist of interbedded layers of sand, silt, and clay. <br /> 2. Groundwater was not encountered in any of the borings advanced at the site. <br /> 3. Petroleum hydrocarbons were reported in soil samples collected from 13 of the boreholes <br /> at the site (B-1 through B-10, and B-12 through B-14). The highest levels of petroleum <br /> hydrocarbons were reported from the borings in the drainage ditch located immediately <br /> west of the dehydrator station (B-7 through B-10). Boring B-10 contained the highest <br /> levels of petroleum hydrocarbons with total oil and grease up to 4,400 mg/kg and TPH-D <br /> up to 9,300 mg/kg. BTEX compounds represent a very minor portion of the petroleum <br /> hydrocarbons identified at the site, and when detected were generally reported in the <br /> parts-per-billion range. <br /> 4. The petroleum hydrocarbons identified in the soil samples consist primarily of diesel-range <br /> hydrocarbons. <br /> cca09/17/93(9784a.doc)cp45) 6-1 <br />