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Some of the BMP's to be applied to this feature are as follows: <br />Typical maintenance activities for dry detention ponds <br />Activity <br />* Note erosion of pond banks and bottom <br />* Inspect for damage to the embankment <br />* Monitor for sediment accumulation in the facility <br />* Examine to ensure that inlet and pond are free of <br />debris and operational <br />* Repair undercut or eroded areas <br />* Remove litter and debris <br />* Remove sediment from the pond <br />* Monitor sediment accumulations, and <br />remove sediment when the pond volume <br />has been reduced by 25 percent <br />Schedule <br />Semi-annual inspection <br />Annual inspection <br />Maintenance as needed <br />Rule 6.4.12 Exhibit L- Reclamation Cost <br />22.) The highwall of this pit is approximately 1800 feet in length <br />currently, however during the routine task of mining (excavating) this pit the bulk of <br />the highwall will be reduced to a slope of 3h:ly of flatter to facilitate the <br />final reclamation. However since the pit is not in a period of high <br />production currently the applicant/operator will start reducing the highwall <br />when the next stage of mining starts. The operator / applicant commits to <br />this method of mining technique for the life of the mine. Therefore in <br />the calculation of the financial warranty cost a length of 400 feet will be used. <br />23.) The side slopes will be graded to approximately 3h:ly of flatter please see <br />revised Reclamation Plan Map Exhibit F attached with this adequacy review reply. <br />24.) With the revision to the reclamation plan the operator will disturb approximately <br />30 % of the total permit area for the purpose of calculating the financial <br />warranty cost. Therefore the 7.5 acres will be used for the purpose <br />of calculating the bonding dollar amount. Please see the Mining Plan Map and <br />the Reclamation Plan Map for the location on site. <br />Rule 6.4.13 Exhibit M- Other Permits and Licenses <br />25.) <br />1.) This pit does not have a stormwater discharge permit from the <br />Colorado Department of Public Health and environment (CDPHE). <br />The operator will obtain a CDPS GENERAL PERMIT for Stormwater <br />Discharges Associated with Sand and Gravel Mining under the Colorado <br />6