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• ' • III IIIIII 111IIII III • 999 -- Cliffs Engineering, Inc. Helping develop earth's resources to meet the world's needs. November 17, 1983 N4V ~ 1 1983 Mr. Peter V. O'Connor Reclamation Specialist Mined Land Reclamation Division COLORADO DEPARTMENT OF NATURAL RESOURCES 1313 Sherman Street, Room 423 Denver, Colorado 80203 Dear Mr. O'Connor: RECEIVED MINED LAND RECLAMATION DIVI510N Colo. Dept. ai Natural Resources Enclosed are three copies of revised drawings related to Industrial Resources, Inc.'s Pilot Solution Mining Project. These drawings depict design modifications to the evaporation ponds and salt handling area per the request of BLM. These modifications include: 1. Evaporation Pond - Incorporation of a pond liner leak detection system beneath the hypolon pond liner. The proposed design basically duplicates that used by Rio Blanco Shale Oil Company at Tract Ca except that a 20 mill PVC synthetic liner is used rather than a clay liner. The unavailability of suitable clay materials near the site necessitated the use of a PVC underliner. Salt Handling Area - The entire area where sodium bicarbonate is loaded into trucks is underlain with a four-inch-thick (minimum) asphalt or concrete pad. The pad is sloped toward its perimeter where precipitation runoff (potentially salt laden) is intercepted by lined ditches and subsequently is directed to the evaporation pond. This provision is intended to prevent salt contamination of shallow aquifers which could have otherwise occurred. We are still in the process of compiling rock mechanics information obtained from testing of core samples extracted during this summer's drilling program. We apologize for the delay in getting this information to you. Our current projections are to supply this data sometime during the week of November 27, 1983. A Subsidiary oe The Cleveland-Ci11r"fs lion Company BIB TAUGHENBAUGH BLI/0. POST OFFICE BOX 1211 RIFLE. COLORg00 !1650 I]0]I 625-2~~5 \~