06/27/2007 Env Bd Packet - Laserfiche WebLink

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Permit Application No. 07 -002 The Wessel Company 411 14. WCA Notice of Wetland Replacement Plan Application, dated January 16, 2007. i 15. Letter Addressing Wetland Mitigation Application TEP comments prepared by Hult & Associates, Inc., dated February 2, 2007, received February 12, 2007. Findings: 1. The proposed project entails a 2,060± LF rural section gravel road with one existing single family home and three new single family lots on 25± acres. The site contains a number of large wetlands that are tributary to Rice Creek. 2. The project proposes two filtration basins to manage stormwater runoff from the roadway and house lots. The filtration basins satisfy District rate control and water quality treatment requirements. The proposed stormwater features may not satisfy District infiltration standards. Submitted shallow soil borings indicate the presence of sandy soils at proposed septic system sites. Geotechnical soil borings are required to determine depth to water table and substrate materials at the location of the proposed stormwater features. Revised plans and details eliminating or raising basin underdrains are required if suitable soils and groundwater conditions exist. 3. Four wetlands are identified in the submitted delineation report. District Wetland Specialist approved the delineation under RCWD Review 04 -048R. The project proposes impacts to 0.096± acres of Type 2 and 3 wetland. Onsite mitigation of 0.096± acres of NWC and 0.096± acres of PVC satisfies WCA standards. The WCA comment period has expired and all TEP comments have been addressed. District staff recommends approval of the wetland replacement plan based on evaluation of the application in light of applicable WCA rules. 4. The RCWD regulatory floodplain elevation for the site is 887.5 (Rice Creek at I -35W, 1998 Calibration Study). Proposed low floor elevations satisfy District freeboard standards. Based on visual review of proposed road cross - sections, there is minor floodplain fill at wetland crossings which is more than compensated for via cut for right -of -way swales. 5. The submitted erosion and sediment control plan includes silt fence downslope of disturbed areas, revegetation specifications, and an implementation schedule. A revised grading plan including riprap at stormsewer outfalls is required. • 6. The submitted Preliminary Plat includes easements over existing Emmons & Olivier Resources, Inc. 4 2/23/07