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Mr. Martin Azcarraga June 7, 2000 Page 2 of 4 r~ The City of Grand Junction requires athirty-foot (30) mining buffer from the south and east drainage and utility easements, a 125-ft buffer from the trailer pazk units, a 26' right- of-way (ROW) buffer along 23 Road, and a 16-ft ROW buffer along G Road. Exhibit C- 1drawing from the 112 Permit application depicts [he man-made structures within 200-ft of the permit boundary. The closest man-made structure to the mining azea is a catch basin structure located at the northwest comer of the property, which is owned by the Grand Junction Drainage District. Minine Description The sand and gravel will be mined by a progressive, open pit method. Reclamation for the site will consist of backfilling the site to approximate pre-mining grades. A large amount of import fill will be required, in addition to the existing overburden material, to accomplish [his task. As mining operations occur at the sand and gravel highwall, overburden stripped immediately in front of this highwall will be used as backfill material behind areas that were previously mined. The maximum depth of the mining operations is estimated at 32-ft below the existing ground surface. The "excavation area", which consists of the sand and gravel highwall, the overburden highwall, and backfill azea will be limited to a maximum of three acres at any one time. Groundwater at the site is approximately 12-ft below the ground surface. Therefore, dewatering operations will be required for sand and gravel highwall mining, and backfill placement. Damages to offsite man-made structures, which could occur as a result of the sand and gravel mining operations, include: • Landslide /Slope failures from the sand, gravel, and overburden highwall; • Groundwater Impacts; • Drainage Impacts; • Compaction /Vibration Impacts; • Motor Vehicle accidents; Laudslide / Slope Failures The total mining depth is expected to be approximately 32-ft below the existing ground surface. The closest man-made structure, a catch basin structure, is located 30 feet from the mining area.