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"--5 <br /> irk ; j r <br /> _ se <br /> TEMPORARY SUBSIIT U IE SUPPLY PLAN <br /> Challenger Pit <br /> �nerel <br /> The Challenger Pit is a sand and gravel mining facility operated pursuant to a lease <br /> agreement by Western Mobile Inc. (WMI) near the City of Loveland in Section 29, T.5N., <br /> R.67W. (See Figure B•1). The 105-acre mining operation lies immediately adjacent to the <br /> Big Thompson River and is being mined under Mined Land Reclamation Permit No.8502& <br /> Although portions of the facility have been in operation since the mid 1980's, no gravel <br /> production is projected for 1990. <br /> During the course of the mining activities, groundwater has been exposed to the <br /> atmosphere, resulting in evaporative losses and a corresponding depletion of the flows of the <br /> Big Thompson and South Platte rivers. Recent legislation (Senate Bill 120) mandates that <br /> these losses be replaced to the stream system in accordance with a court approved <br /> augmentation plan or pursuant to a temporary substitute supply plan approved by the State <br /> Engineer. This report presents a summary of the estimated evaporative and incidental losses <br /> associated with the Challenger mine operation and describes a Tam Substitute Supply <br /> Plan which will be used to replace the net stream depletions ' g senior water rights owned <br /> or controlled by WML <br /> Evaporation Losses <br /> According to the provisions of SB 120, groundwater that was exposed to the <br /> atmosphere in the course of gravel mining activity prior to January 1, 1981, is not subject to <br /> the statutory requirements for augmentation or a plan of substitute supply to replace the <br /> depletions from evaporation. Based on interviews with the operators of the mine,it has been <br /> determined that no mining occurred at the Challenger Pit prior to January 1981. Currently <br /> (June 30, 1990). there are a total of about 4.6 acres of exposed groundwater at the site. This <br /> value was obtained using aerial photographs taken in December 1988, verified by field <br /> inspection. The net acreage of exposed groundwater at Challenger which will require <br /> 1 <br />