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CGRS, lac. • • <br />' closely approximating natural ground water than for the TCLP test. The results of the SGLP are <br />directly comparable to the TCLP test <br />Groundwater obtained from the study area was used for the test. The full suite of chemical <br />compounds (see list for SELP test) were analyzed during the SGLP test. The groundwater used in <br />' the SGLP test as the leaching fluid was analyzed for full suite of chemical compounds. The <br />difference in the before and after chemical concentrations in the ground water used in the SGLP <br />test represents the concentration of the chemical contaminants leached from the ash. <br />' 23.4 "Syathetic Grouadwater Column Leachiag Procedure" (SGCLP) <br />The purpose of the "Synthetic Groundwater Column Leaching Procedure" (SGCLP) test was to <br />' determine the rate as a function of pore volume at which the chemical contaminant will be leached <br />from the buried ash. The SGCLP test used synthetic groundwater with varying pH levels as the <br />' leaching fluid(s). With the SGCLP test, a specified weight (e.g. one kilogram) of the ash was <br />placed in a column. Once the column was saturated, the testing period began. One pore volume of <br />' water was passed through the column and the concentration of the various contaminants measured <br />in the outflow water. The SGCLP test was then repeated for several sequential pore volumes of <br />' water. The hydraulic head on the column was adjusted so that one pore volume of water was <br />passed through the sample in about 12 hours. Water samples were obtained for analyses at 2, 4 <br />' and 8 pore volumes of water flow through <br />' The SGCLP test was repeated for synthetic ground water with varying pH values to represent a <br />range of possible site conditions. Synthetic ground water(s) with pH values of 5, 7 and 8.5 were <br />' used as the leaching fluid(s). For the fly ash, which has a very low hydraulic conductivity, the <br />SGCLP test was conducted for 1, 2 and 4 pore volumes. For the bottom ash, the recycled concrete <br />' and the recycled asphalt, which have high hydraulic conductivity, water samples were analyzed at <br />2, 4 and 8 pore volumes. <br />The chemical analyses for the first extraction of the SELP test was used to determine the suite of <br />' chemical compounds of interest in the SGCLP test. Chemical compounds, which were either non- <br />detect or detected at very low were eliminated from further testing. The SELP test is a highly <br />' 6 <br />