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<br />TUTTLE APPLEGATE, INC. <br />Consultants for Land and Resource Development <br />July 16, 1990 <br />Dr. Jeris A. Danielson <br />State Engineer <br />1313 Sherman Street - Room 818 <br />Denver, Colorado 80203 <br /> <br />RE: Application for Temporary Substitute Water Supply Plan for <br />Weld County Colorado Koenig Pit; Permit No. M-80-120 <br />Dear Dr. Danielson: <br />The purpose of this letter is to request approval of a substitute <br />water supply plan pursuant to Section 37-80-120 (2) C.R.S. on <br />behalf of the Weld County Commissioners for their Koenig Gravel <br />Pit. <br />A. INTRODUCTION <br />The Koenig Gravel Pit is owned and operated by Weld County. The <br />operation began in 1980 and will be active for 10 to 15 more <br />years. The gravel pit sits in the floodplain of the South Platte <br />River. The mine site is approximately three miles north of Fort <br />Lupton and is bounded on the west by the small town of Vollmar <br />(See Figure No. 1). <br />The mine site is made up of three different parcels as delineated <br />on the enclosed map. The permit area that lies to the west is <br />owned by Weld County. The other two tracts have previously been <br />mined, reclaimed and sold. <br />B. DEPLETIONS <br />1. EVAPORATION <br />Lake evaporation was determined for the existing lakes (See the <br />enclosed map) on the mine property. The total exposed lake <br />surface area is 17.60 acres. <br />Prior to 1981 three ponds were present on the site. The pond <br />that lies on the west parcel has never been mined by Weld County <br />and consequently was not considered for evaporative losses in <br />this report. The surface areas claimed for credit for the other <br />pre-1981 ponds, 2.80 acres and 1.30 acres (the area underlain by <br />the current lake), were subtracted from the current lake areas <br />(See Table No. 1) before evaporation was computed. <br />.~ <br />