6.1. SR 03-17-2003 - Laserfiche WebLink

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17. Water Quality: Surface Water Runoff Compare the quantity and quality of site runoff before and after the project. Describe permanent controls to manage or treat runoff. Describe any storm water pollution prevention plans. Surface water runoff and proposed controls have been discussed in the preceding item. As noted in Items 9 and 10, the majority of the Site is grassland and will remain unaltered. Currently, no surface water runoff or sedimentation controls are employed at the Site. be The proposed mining operation will change the existing topography and may increase the quantity ofrunoffthrough the Site to some extent. However, it is anticipated that most of the run off will flow into topographic depressions or wetlands on the Site and eventually infiltrate to the shallow groundwater aquifer. The engineered erosion and sedimentation controls identified in Item 16 will be based on runoff from the mining area. Preparation of a SWPPP will be required to manage storm water run off. Specifically, the SWPPP will describe site conditions and operations, including outdoor storage of materials and a description of spill response procedures. If recycled asphalt is used and stored at the Site, drainage from the piles will be prevented from entering any surface waters. If applicable, monitoring of surface water quality may also be proposed or required. Best Management Practices (BMPs) identified in the SWPPP will be implemented as part of routine operations at the Site. The Site will be returned to its natural state upon completion of the mining and pre- development runoff rates leaving the Site will be maintained upon completion of the project. In addition, all current hydrology of the on Site wetlands will be maintained. Any additional water brought on Site via water trucks to control dust on roads will not be over-applied to create an increase to sediment loads or runoffrates. Identify routes and receiving water bodies for runoff from the site; include major downstream water bodies as well as the immediate receiving waters. Estimate impact runoff on the quality of receiving waters. Based on a review of the USGS topographic map, surface water on the western portion of the Site is expected to flow into the topographic depressions and wetlands. The western portion of the Site may eventually drain into wetlands approximately 2,000 feet to the north and eventually to an intermittent stream that drains into Trott Brook. Runoff on the eastern portion of the Site will flow into a wetland located on the eastern boundary of the Site and may eventually drain into Trott Brook located approximately 3,400 feet east of the Site. Trott Brook flows into Eagle Lake located approximately 1.5 miles southeast of the Site and eventually to the Rum River. These drainage conditions and distances and the proposed Site erosion and sedimentation and control measures suggest little to no impact on receiving water bodies. LIESCH ASSOCIATES, INC. Hydrogeologists. Engineers · Environmental Scientists · Jan-2003 · - Page 10 ·