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shall be maintained at the elevation of the bottom of the gravel deposit immediately adjacent at the <br /> south, thus extending the remnant bench following the gravel extraction for as far to the north as <br /> excess overburden is available. <br /> Existing overburden stockpiles shall be transferred east to the south headwall slope-bank of worked- <br /> out portions of the pre-existing permit area and then finish graded for postponed reclamation <br /> topsoiling and re-vegetation. Worked-out areas of finished excavation shall be graded smooth and <br /> utilized for stockpiling and processing operations during the remainder of the extraction and <br /> production operations, before reclaiming those areas at the end of the pit life. <br /> [c] Water impoundments and diversions are limited to the following. Water for site operations <br /> such as concrete aggregate washing and dust abatement shall be furnished from Nucla C-C Ditch <br /> water rights owned by Weimer Ranch and leased to the operator. Such water shall be pumped to a <br /> permanent clay-lined holding pond constructed within the east worked-out portion of the site. Tail <br /> water from operations shall be directed to a separate settling pond, the outlet of which shall be <br /> directed into the Weimer Ranch irrigation system for dispersal on irrigated fields. <br /> The hydrologic balance shall remain unchanged at the site, since no ground water is to be <br /> encountered. The surface of the mesa top shall be lowered by 15 to 20 feet in the form of a lowered <br /> bench, `daylighting' to the north. Surface moisture shall in this way be retained or delayed for better <br /> utilization by the re-vegetation effort. <br /> [d] Pre-existing pit excavations and overburden stockpiles cover about 19 acres of the 28.7-acre <br /> current l i l permit area. Proposed initial excavations south and west of the current pit will add <br /> approximately 4 acres of excavation and 3/.-acre of topsoil stockpiles along the south and west <br /> perimeters. Continued pit Secondary Mining extension to the north shall add more than 6% acres of <br /> resource excavation, including an unmined area beneath a pre-existing overburden stockpiles to be <br /> relocated into worked-out portions of the new excavation, or to the permanent NW depression <br /> disposal fill. The north ridge (Tertiary) final excavation is about 3 acres. Permanent overburden <br /> disposal in the northwest quadrant of the site shall add 2 to 3 acres of flat bench to the affected area. <br /> [e] Initial Mining operations shall resume in the former 111 permit area excavation <br /> approximately in the winter or spring of 2001 and proceed to exhaustion of the available gravel <br /> deposit resources at the site. Completion of the remainder of the Initial Mining excavation to the <br /> south and west excavation limit is expected to take a year or two, depending upon economic market <br /> conditions. Mining shall proceed first south, then 400 feet west at the full depth (15 to 20 feet) of <br /> the deposit and about 350 feet wide, bordering on the topsoil stockpile at the south permit boundary. <br /> A steep headwall shall be maintained throughout the mining up to the mining limit to maximize <br /> resource retrieval. <br /> Extraction in the Secondary Mining excavation area will extend the mined-out area to the north <br /> another 300 feet for the full width of the remaining resources in the south 700 ± feet of the permit <br /> area, and at the full depth of the gravel resource deposit. This phase is expected to take 2 to 3 years, <br /> depending upon market conditions. <br /> 13 <br />