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Excess overburden not needed for such slope reduction shall be paced in a permanent embankment fill within the depression at the northeast quarter of the site. The top elevation of the embankment shall be maintained at the elevation of the average bottom of the gravel deposit immediately adjacent at the south, thus extending the remnant bench following the gravel extraction for as faz to the north as excess overbwden is available. Existing overbwden stockpiles shall be transferred east to the south headwall slope-bank of worked- out portions of the pre-existing permit area and then finish graded for postponed reclamation topsoiling and re-vegetation. Worked-out areas of finished excavation shall be graded smooth and utilized for stockpiling and processing operations during the ~~remainder of the extraction and production operations, before reclaiming those areas at the end of the pit life. [c] Water impoundments and diversions are limited to the following. Water for site operations such as concrete aggregate washing and dust abatement shall be, fwnished from Nucla C-C Ditch water rights owned by Weimer Ranch, transferred for industrial use, and leased to the operator. Such water shall be pumped to a permanent clay-lined holding,pond constructed within the east worked-out portion of the site. Tait water from operations shalq be directed to a separate settling pond, the outlet of which shall be directed into the Weimer Rancb irrigation system for dispersal on irrigated fields. The hydrologic balance shall remain unchanged at the site, since no ground water is to be encountered. The surface of the mesa top shall be lowered by 15 tl° 20 feet in the form of a lowered bench, `daylighting' to the north. Surface moisture shall be retained for better utilization by the re- vegetation effort by flat grading and bench crest incorporated berrrls. [d] Pre-existing pit excavations and overburden stockpiles coffer about 19 acres of the 28.7-acre current 111 permit area. Proposed initial excavations south an~ west of the current pit will add approximately 4 acres of excavation and '/.-acre of topsoil stn~~jjkpiles along the south and west perimeters. Continued pit Secondary Mining extension to the nor#h shall add more than 6%z acres of resource excavation, including an wunined area beneath apre-existing overburden stockpiles to be relocated into worked-out portions of the new excavation, or to the permanent NW depression disposal fill. The north ridge (Tertiary) final excavation is about 3 acres. Permanent overbwden disposal in the northwest quadrant of the site may add 1 to 3 acres bf flat bench to the affected area. [e] Initial Mining operations shall resume in the former 111 permit area excavation approximately in the winter or spring of 2001 and proceed to exhaustion of the available gravel deposit resources at the site. Completion of the remainder of the Initial ~Lfining excavation to the south and west excavation limit is expected to take a year or two, depending upon economic market conditions. Mining shall proceed first south, then 400 feet west at the full depth (15 to 20 feet) of the deposit and about 350 feet wide, bordering on the topsoil stoclepile at the south permit boundary. A steep headwall shall be maintained throughout the mining up to the mining limit to maximize resowce retrieval. Extraction in the Secondary Mining excavation azea will extend the mined-out area to the north another 300 feet for the full width of the remaining resowces in the south 700 ± feet of the permit area, and at the full depth of the gravel resowce deposit. This phase is expected to take 2 to 3 years, depending upon market conditions. 13