Laserfiche WebLink
Soils <br />Initial coal waste characterization performed in 1990 indicated <br />unsuitably high sodium adsorption ratios (SAR), and moderately high <br />electrical conductivity levels (EC). A primary concern with <br />respect to cover depth requirements was the extent to which sodium <br />salts might move upward into the replaced soil cover over time. <br />Given this concern, a sampling program to document initial soil and <br />refuse SAR and EC levels in the various test plots, and to re- <br />sample SAR and EC levels in the same locations using the same <br />sampling procedures at the conclusion of the study period was <br />determined to be an important component of the study. <br />In the March 2, 1990 draft study plan (the only version of the plan <br />I have on file), it is stated that "one representative composite <br />topsoil sample and one representative subsoil sample will be <br />analyzed...", and that "two separate composite samples of the coal <br />refuse, one from the north slope plot area and one from the south <br />slope plot area, will be analyzed..." The draft study plan also <br />stated that a "plant sample will be analyzed for selenium and boron <br />content if the pre-reclamation investigation shows a high <br />concentration of these elements in the refuse, topsoil, or <br />subsoil." <br />In a June 8, 1990 letter to Murari Shrestha of WFU, I indicated <br />that analysis of the refuse sample I had collected suggested that <br />"it would be prudent to sample incremental cover soil depths upon <br />completion of test plot construction so that any upward movement of <br />sodium over time could be monitored." In a follow-up letter of <br />June 15, 1990, I included the following specific recommendation <br />with respect to initial and subsequent test plot soil sampling: <br />In both the north facing and south facing study area, a <br />least one representative sample should be taken from the <br />12" cover depth plots. Also in both study areas, a <br />least one representative sample should be taken from each <br />12" cover soil increment in the 48" cover depth plots. <br />Sampling procedures and locations will need to bej <br />documented to allow for valid comparison based on futurell, <br />sample results. Each sample should be analyzed for <br />texture, electrical conductivity and sodium adsorption <br />ratio. By repeating the sampling in future years, it <br />should be possible to determine whether any upward <br />migration of salts is occurring. The results should <br />provide some indication of the rate and extent of upward <br />igration, if any, and the effect, if any, of soil depth <br />nd slope exposure on salt migration. <br /> <br />In a memorandum of July 10, 1992, to Janet Binns, I noted that a <br />test plot evaluation proposal I had reviewed did not address soil <br />sampling and analysis. I stated that soil sampling consistent with <br />the procedures outlined in the June 15, 1990 letter should be <br />undertaken as a part of the 1995 test plot evaluations. Notes I <br />have from July 15, and July 17, 1992 telephone conversations with <br />