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1 <br />2.0 PROJECT DESCRIPTION <br />1 • • <br />MEMORANDUM <br />TO: Roger Day and Jack Clark, AmerAlia, Inc. DATE: August 19, 1999 <br />FROM: Scott Miller and Bill Thompson OUR REF.: 993 -2057 <br />Golder Associates Inc. <br />RE: ROCK SCHOOL LEASE EXPERIMENTAL NAHCOLITE MINE - <br />QUALITATIVE RISK ASSESSMENT <br />1.0 INTRODUCTION <br />This memorandum presents the approach, methods, and results of a qualitative risk <br />assessment developed to evaluate the potential environmental risks to soils, surface and <br />groundwater, and wildlife associated with the proposed Rock School Lease Experimental <br />Nahcolite Mine. The objective of this assessment is to review the proposed mine plan and <br />evaluate the adequacy for environmental protection. In areas where potential risks are <br />identified additional mitigation is proposed. <br />The Rock School Lease Experimental Nahcolite Mine is located in Rio Blanco County, <br />Colorado. The experimental mine will consist of the following: <br />• Pilot -scale processing plant <br />• Limited to six solution mining wells and 5 year operation <br />• Surface pipeline from well field to plant <br />• Drainage pond <br />• 3 -acre evaporation pond <br />• 7 -acre evaporation pond <br />• Fresh water pond <br />• Water supply well <br />• Process monitoring well <br />• Compliance monitoring well <br />\ \GA1_DEN1\ PROJECTS \WP\99\2057\2057TM1.DOC Golder Associates <br />