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0 0 <br />The Permittee shall document the procedures used in <br />making the above determinations. <br />3. Surface Water and Sediment Contamination <br />The Permittee shall collect at a minimum the following <br />information when conducting investigations of surface water <br />and sediment contamination of the facility: <br />a. A description of the horizontal and vertical <br />extent of any plume(s) originating from the <br />facility, and the extent of contamination in <br />underlying sediments; <br />b. The horizontal and vertical direction of <br />contaminant movement; <br />C. The contaminant velocity; <br />d. An evaluation of the physical, biological and <br />chemical factors influencing contaminant <br />movement; <br />e. An extrapolation of future contaminant <br />movement; and <br />f. A description of the chemistry of the <br />contaminated surface waters and sediments. <br />This includes determining the pH, total <br />dissolved solids, specific contaminant <br />concentrations, etc. <br />4. Air Contamination <br />The Permittee shall collect at a minimum the following <br />information when conducting investigations of air <br />contamination at the facility: <br />a. A description of the horizontal and vertical <br />direction and velocity of contaminant <br />movement; <br />b. The rate and amount of the release; and <br />C. The chemical and physical composition of the <br />contaminant(s) released, including horizontal <br />and vertical concentration profiles. <br />The Permittee shall document the procedures used in <br />making the above determinations. <br />5. Subsurface Gas Contamination <br />