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IV. EVALUATING APPLICABLE STANDARDS/RISKS DETERMINATION <br />A. The applicant should provide a description of any applicable standards, <br />guidance, or remediation objectives (federal, state, or other) establishing <br />acceptable cleanup levels for contaminants in the soils, surface water, and <br />groundwater. <br />For this ICAP, E-21 proposes to use the soil cleanup levels in Table 1 from the <br />CDPHE, Hazardous Materials and Waste Management Division, Soil Cleanup <br />Levels (March 2005) protective of groundwater for benzene, toluene, ethyl <br />benzene and total xylenes. The cleanup standard in soils for these contaminants <br />are summarized below: <br />Tnhla I\/ Al Snit r1Pnnun Standard <br />Contaminant Benzene Toluene Ethyl <br />Be <br />e Total Xylenes <br />Name mg/Kg mg/Kg n Kg mg/Kg <br />Cleanup 0.17 104 85 1,000 <br />Level <br />E-21 proposes to use the current CDPHE, Water Quality Control Commission, <br />Basic Standards and Methodologies for Surface Water (5 CCR 1002-31) for <br />benzene, toluene, ethyl benzene and total xylenes. The cleanup standard in <br />groundwater for these compounds is summarized below: <br />Tnhlc 1\/ A7 ('-rni inriwntar I^lanni in Standard <br />Contaminant Benzene Toluene Ethyl <br />Benzene Total Xylenes <br />Name ug/Kg ug/Kg <br />g Kg ug/Kg <br />Cleanup 5 700 1,000 1,400 <br />Level <br />B. The applicant should provide a description of the human and environmental <br />exposure to contamination at the site based on the property's current use and <br />potential future uses including: <br />' - A table or list of site contaminants indicating which media are <br />contaminated and the estimated vertical and areal extent of contamination <br />in each medium. <br />There are three areas where gasoline contaminants exist or likely, exist. These <br />include: <br />1) the pipeline "release area" within the right-of-way" located at the <br />intersection of the slurry wall and the Rocky Mountain Pipeline; <br />2) the incomplete "slurry wall excavation" located immediately to the west <br />of the pipeline release area; and, <br />3) the "Slurry Holding Trench" located immediately east of the pipeline <br />release area. <br />The highest known level of soil contamination for each of the compounds is <br />summarized below: <br />13