Nashville Zoo at Grassmere Stream and Water Quality Improvements Quality Improvements Littlejohn Engineering Associates, Inc. Civil & Environmental Consultants, Inc.

Stream Improvement Objectives Bank Stabilization Opportunities Limited Re-establish Stream at Location of Lower End Pond Exotic Plant Control (privet, honeysuckle, et. al.) Re-establish Native Vegetation Habitat Amendments (slab rock, log drop structures for crayfish)

Project Site Phase V – Construct middle wetland Phase I – Construct and line pond, construct water quality forebays Phase II – Construct upper wetland Phase III - Construct/install water recirculation system

Project Site Phase IV - Options: Convert existing pond into wetland Re-establish stream, remove pond Phase II - Options: Construct lower off-line wetland

Line Existing Water Quality Pond to Retain Water Water Quality Improvements - Upper End Raise Height of Existing Weir to Increase Pond Capacity Construct Water Quality Forebay for Storm Water from Adjacent Business Park Upper Wetland Adjacent to Storm Water Retention Pond, 1.5± Ac. Construct/Install Recirculation System to Supply Water from Retention Pond to Upper Wetland and to the Stream Construct/Install Catch Basins and Piping to Direct Storm Water from Upper Parking Lot to Forebay on East Side of Water Quality Retention Pond Construct/Install Pump and Force Main to Remove Water from Lower End of Stream and Pump to Retention Pond and Upper Wetland

Middle Wetland Adjacent to Pond, 0.25± Acre Water Quality Improvements – Middle Improve Flow Through Pond to Reduce Algal Growth

Lower Wetland adjacent to stream, 1.0± Acre Water Quality Improvements – Lower End Possible Stream Restoration (300 feet) and Elimination of Existing Pond Possible Wetland Creation/Restoration of Existing Pond

Mitigation Credits Earned Consider Project as a Whole to Earn Maximum Credits Overall Ratio Expected to be 4:1 2,580± Feet of Stream Generates 645 Credits at $200/foot or $129,000 Wetlands Creation Credited at 4:1 Ratio; 4 Acres of Wetlands Generates 1 Acre of Credit or $25,000 Total Credit Dollars Earned $154,000

Conceptual Plan Opinion of Probable Construction Cost Construct Retention Pond and Forebays $225,000 Water Quality Upgrade of Parking Area $80,000 Water Recirculation (force main with pump) $110,000 Construct/Create Upper Wetland $45,000

Conceptual Plan Opinion of Probable Construction Cost Construct/Create Middle Wetland $20,000 Construct/Create Lower Wetland $30,000 Alternate Stream Reconstruction/ Restoration (300 feet) $48,000 Bank Stabilization/Habitat Amendments $50,000

Exotic Plant Control/Re-establish Native Vegetation $30,000 Total of Opinion of Probable Construction Cost $638,000 Conceptual Plan Opinion of Probable Construction Cost

Phase I - $225,000 Construct Retention Pond and Forebays Phase II - $75,000 Construct Upper and Lower Wetlands Phase III - $190,000 Water Quality Upgrade of Parking Lot and Water Recirculation Phase IV - $98,000 Stream Restoration, bank Stabilization/ habitat Amendments Phase V - $50,000 Construct Middle Wetland and Exotic Plant Control/ Re-establish Native Vegetation Opinion of Probable Construction Cost Breakdown by Phase

Nashville Zoo at Grassmere Open Discussion