Wetland investigation report-2013

Home Browse Search

Anderson Engineering of MN, LLC Bren Homes-Wetland InvesUgation#13499 April 30,2013 Resource Review The following resources were reviewed to supplement the wetland field delineation: National Wetlands Inventory: The National Wetlands Inventory (Appendix A. Figure 2) identifies two wetlands within the project area. The NWI identifies the wetland as: • One Type 3, PEMC shallow marsh. • One Type 5, L1 UBH shallow open water. Natural Resources Conservation Service Soil Survey: The Soil Survey of Hennepin County, MN (Appendix A. Figure 3) identifies hydric soil within the project area. The identified soils include • Hamelloam • Muskego muck • Tadkee loamy fine sand Minnesota Department of Natural Resources Public Water Inventory: According to the MN DNR PWI for Hennepin County, MN (Appendix A. Figure 4), Lake Minnetonka-Stubbs Bay is located on the western portion of the project area. Antecedent Precipitation Data: A review of the antecedent precipitation data collected from the University of Minnesota Climatology Working Group (Appendix D) indicate that precipitation totals for the previous Weeks were slightly above average in Hennepin County and hydrologic conditions were suitable for completing an accurate wetland determination and boundary delineation. Field Review One Type 3 PEMC, shallow marsh was identified onsite. The wetland extends off-site to the north and west. The on-site portion is approximately 0.04 acres in size. The wetland was dominated by common cattail (Typha angustifolia) and Reed Canary Grass (Phalaris arundinacea). The underlying soils are mapped as Muskego muck. The investigated soil profile met the Black Histic (A3) hydric soil indicators. Indicators of wetland hydrology included surface water, the FAC-Neutral Test and geomorphic position. Based on the Minnesota Routine Assessment Methodology for Evaluating Wetland Functions (MnRAM), this wetland is classified as Manage 1. Due to the wetland being located adjacent to Lake Minnetonka, which is classified as a Preserve, this wetland will be treated as a Preserve. Additional Investiqated Areas: One wooded area dominated by smooth brome and common buckthorn on the north side of the project area was investigated and determined to be non-wetland. This area is described on Data Form SP-3 (Appendix B). The mapped soil was Hamel loam. The investigated soil for this area did not meet hydric criteria and there was no evidence of persistent wetland hydrology. 5 A E