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CGRS,Inc. i • <br /> ' TABLE 1 - Results for Hydraulic Conductivity and Porosity Tests <br /> 1 <br /> ' Sample ID Hydraulic Porosity <br /> Conductivity <br /> ' K <br /> Cherokee Silo Ash 2/3 fl/da <br /> ' 0.24 0.51 N <br /> Cherokee 4 Ash with Sodium <br /> 0.23 0.46 � ( <br /> ' Class F Silo Ash with Gypsum <br /> 0.09 0.49 <br /> ' Bottom Ash <br /> 178. 0.51 <br /> ' Recycled Concrete <br /> 111. 0.29 <br /> ' Recycled Asphalt <br /> 130. 0.33 <br /> ' The bottom ash, the recycled concrete and the recycled asphalt all had relatively high hydraulic <br /> conductivity values in the range of 11 I to 178 feet/day. The three fly ash samples had very low <br /> ' hydraulic conductivity values in the range of 0.09 to 0.24 feet/day. The porosity of the fly and <br /> bottom ash ranged from 0.46 to 0.51. These values are characteristic of very fine porous <br /> ' materials. The porosity of the recycled concrete and asphalt was 0.29 and 0.33, respectively. <br /> ' 2.3 Analytical Data <br /> 2.3.1 "Sequential Extraction Leaching Procedure" (SELP) <br /> ' The purpose of the "Sequential Extraction Leaching Procedure" (SELP) test was to determine the <br /> total quantity of the various chemical contaminants that may be potentially leached from the ash. <br /> ' The SELP test used synthetic groundwater with varying pH levels as the leaching fluid(s). With the <br /> SELP test, a specified weight (e.g. one kilogram)of the ash was combined with a specified volume <br /> ' of water (e.g. one liter) and agitated by rolling for a specified period of time(e.g. 18 hours). This <br /> represented a single extraction. The concentration of the chemical contaminant was then measured <br /> ' in the water. The SELP test was repeated for several sequential extractions until most of the <br /> 4 <br />