Agenda - 10-14-1993 - D 1 - Laserfiche WebLink

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currently under productive agricultural use. Therefore, expansion of quarry operations, the asphalt plant and the road relocation, will not remove any farmland acreage from current production. 4.5 Physical Environment 4.5,1 Water Quality Impacts A. Surface Water Short term degradation upon surface water quality within the project area is possible with the expansion, residential use and agricultural use alternatives due to soil erosion and sedimentation. Uncontrolled erosion and sedimentation can destroy aquatic algae, eliminate benthic macroinvertebrate habitat, eradicate fish spawning habitat and remove food resources for many stream species. Mitigation practices should include protection of stream bottom habitat from siltation by sedimentation control, retention of riparian vegetation buffers, and restoration of linear feet of stream bottom habitat taken by the various alternatives. Stormwater runoff from roads may carry elevated quantities of silt, heavy metals, petroleum products, nitrogen, and phosphorus. This can potentially degrade water quality and habitat integrity. However, since relocated SR 1104 will not vary significantly in size or design from the existing roadway, there will be minimal net increase in impervious roadway surface and,therefore, no increase or change in runoff impurities is expected. Similarly, the expanded quarry and relocated asphalt plant will result in no net increase in impervious areas beyond those of the existing quarry and asphalt plant. Mitigation measures for all alternatives which may be used include minimizing soil exposure by the staging of grading and revegetation, controlling runoff by interception and/or diversion, and shielding the soil surface by applying surface covers. Silt fences, erosion screens, and bale barriers will be installed, if necessary, to slow or deter erosional processes. Also, provision of grass shoulders, grass-lined ditches, and vegetation buffers to intercept highway runoff will reduce impacts to surface water quality. Stormwater runoff from exposed areas adjacent to the expanded quarry will flow into the pit, and then be recycled as process water or discharged to Phil's Creek pursuant to conditions of the NPDES General Permit (See Section 3.5 of this report). Properly implemented spill prevention plans for the quarry and asphalt plant should prevent pollutants or petroleum products from entering and contaminating the surface water resources of the area. For more information regarding these plans, see Section 4.5.3. 4-4