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r._ <br />:- • • <br />Page 2 <br />Linda Walker <br />March 11, 1980 <br />several samples for the access road areas to be reclaimed (approximately <br />8-12 samples for the active site). <br />These disturbed materials should be analyzed for CaC03, copper, molybdenum, <br />iron, maganese, lead and zinc~and boron and selenium 2f the pH of these <br />materials exceeds 8.6 or the acid-base potential if the pH is less than <br />5.0. rThe lime and metals and trace elements analysis will run about <br />524.00/sample excluding analysis ~or boron, selenium and acid-base <br />potential (CSU 1979 price list): From these analyses, we will try to <br />identify problematic concentrations of toxic material which will require <br />disposal or covering and develop the appropriate plans. We will also <br />need to determine the amount of cover needed over these materials to <br />achieve the revegetation performance standards. It is likely in the <br />event of potential toxicity problems that we need to stipulate field trials <br />on small plots within the disturbed area to evaluate vegetation success <br />with varying amounts of cover. The staff can work with the operation in <br />design of these trials and it is possible that someone from CSU might <br />be interested in establishing such a field trial. <br />For any topsoil imported to the site, the applicant should analyze this <br />topsoil for pH, sodium absorption ratio, electrical conductivity and <br />particle soil analysis to substitute its suitability as a plant growth <br />medium. <br />I would be happy to meet with Grand Mesa Coal to discuss the above ideas <br />in more detail if desired. <br />Roger <br />/k <br />~ Sk„~~ G~CA~CIiS~f sk~~.,~,c~l cc-Oso ~ Pe,r.~.a-~,e~, - ~,+~~ S~2 ~ <br />