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_ - <br />a 1 - following <br />inforaa.i conducting of groundwater <br />contamination <br />a. A description of the horizontal and vertical <br />extent i. a plume(s) ofhazardous <br />constituents originating • ir. «... <br />• horizontal • vertical <br />a •.:_• of <br />verticalcontamination movement; <br />C4. The velocity of contaminant movement; <br />t. The horizontal and concentration <br />profiles of hazardous. ,- - in the <br />- <br />• if <br />e4. An evaluation of factors influencing the <br />plumemovement; if <br />extrapolation of future contaminan <br />movement, <br />_ Permittee sha document the procedures _• in <br />making • - above • - . (e.g., welldesign, <br />construction, <br />.:.: geophysics, modeling, <br />• •1 •l: <br />The Permittee shall collect at a minimum the following <br />information when conducting investigations of soil <br />contamination at the facility: <br />a. A description of the vertical and horizontal <br />extent of contamination; <br />b. A description of appropriate contaminant and <br />soilchemicalproperties <br />contaminant <br />- i _ area -and plume.may <br />include contaminant solubility, speciation, <br />adsorption, leachability, exchange capacity, <br />biodegradability, •:. • photolysis, <br />oxidation and other factors that might affect <br />contaminant migration and transformation; <br />C. Specific contaminant concentrations; <br />•:The velocity and direction • contamination <br />movement; and <br />ee a: extrapolation • <br />movement. <br />