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6.4.12 EXHIBIT L - Reclamation Costs <br />20.) It appears that the majority of the South Central Pit and East Pit will be backfilled so <br />that only 16 and 11 acres of open water will remain. How many acres (if any) are already <br />backfilled in the South Central Pit and East Pit? How deep will material be backfilled <br />into the South Central and East Pit? <br />21.) How much material is on site currently to backfill the South Central and East Pit <br />excavations? <br />22.) It states in the Exhibit L narrative that 114 acres of the affected land will remain as <br />open water. However based on the reclamation plan map, 5 open water ponds will <br />contain 140 acres. Please explain this discrepancy? <br />23.) Please provide evidence the pit slopes around the North Central Pit are reclaimed to <br />the required slopes. That is 4:1 to the water line and 3:1 below that. <br />24.) What are the current conditions of the pit slopes around the west pit, south central pit <br />and the east pit in terms of horizontal to vertical slope ratio? <br />25.) Based on the reclamation plan map, the majority of the South Central Pit and the <br />East Pit will be backfilled with material and then revegetated with upland grasses. These <br />upland areas will need to be topsoiled. Please show the location of the current topsoil <br />stockpiles that will be used to topsoil these areas on the mining plan map. <br />26.) Since 140 acres of open ground water will remain after the site is reclaimed, Lafarge <br />must obtain a court approved augmentation plan from the Office of the State Engineer. <br />The Division is required to set the financial warranty at a level which reflects the actual <br />current cost of fulfilling the conditions of the Reclamation Plan per Rule 4.2.1(1). <br />Therefore, without an augmentation plan in place the financial warranty must be set at an <br />amount which accounts for the exposed groundwater. The Division has identified several <br />options for determining the amount of the financial warranty. The Applicant must choose <br />one of the following options to be included in the financial warranty calculation: <br />1) Backfill all of the pits to two feet above the groundwater level. <br />2) Install a slurry wall or clay liner. <br />3) Provide the Division with documentation from SEO, which demonstrates that <br />the Applicant owns a sufficient amount of shares of water to cover the <br />evaporative losses from the exposed groundwater and the said shares have been <br />committed to the SEO should the financial warranty forfeited and the permit <br />revoked. <br />If the Applicant obtains an augmentation plan prior to final release, then the financial <br />warranty will be adjusted accordingly. <br />5