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projects, however, are located off the ridge where borrow pits are dug, fill material is removed, and lakes are created. Most mining operations now involve hydraulic dredging for removal of material below the water table. Some operations, however, involve the use of dewatering pumps to pump -down the water table in the pit and allow removal "in the dry". Since most mines now use hydraulic dredging rather than dewatering, there are few, if any, impacts on groundwater from these pits. *Existing Indian River County Mining Regulations Commercial Mining Existing county LDRs allow commercial mining operations only in the county's agricultural zoning districts. In these districts, mines are allowed as administrative permit uses. Commercial mining operations are allowed on agriculturally zoned property both inside and outside the Urban Service Area. All mining projects, however, must satisfy the county's administrative permit use criteria and its excavation and mining ordinance criteria. Specific mining criteria are as follows: • An acceptable reclamation plan and, where applicable, littoral zone and water quality management plan. • Direct access to a collector or arterial roadway, or a local road that serves non-residential uses. • A prohibition on dewatering operations within 1,000' of a platted subdivision not serviced by public water. • Littoral zone and tree seedling plantings, where a lake(s) will result. • No significant adverse off-site impact on groundwater quality or quantity. • A maximum mining phase area of 20 acres. • A minimum setback of 150' between an excavation pit and property boundaries. • A minimum separation distance of 300' between occupied structures and mining pits, on-site haul roads, and material stockpile areas. • A Type "A" buffer along any site perimeter abutting a residentially zoned property. • For any crusher, mixing bin, tank or storage structure on site, a minimum setback of 600' from residential property and 250' from non-residential property. • A reasonable timetable for project completion and restoration. • Hours of operation for sites adjacent to residential zoning districts limited to 7:00 a.m. - 5:00 p.m. on weekdays, with an ability for the Board of County Commissioners 'to expand those hours.. • Limitations on slope steepness for littoral zones and lake banks. Permanent project stakes on site and annual progress reports. , SEPTEMBER 21 1995 3 600K 96 FAf;F 19-