CCP 02-18-2003 - Laserfiche WebLink

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I I. I I I I I I I Ie I I I I I . I .- I FINANCIALLY RESPONSffiLE PARTY/PARTIES The Guidant Corporation is the responsible party for funding implementation of mitigation measures necessary to comply with the applicable City, watershed and MPCA requirements. 3.4 WATER QUALITY; SURFACE WATER RUNOFF 3.4.1 Summary of Impacts The proposed development will decrease the amount of existing impervious surface area within the AUAR study area, thus decreasing the overall surface water runoff volumes. However, unlike existing surface water runoff which discharges directly into adjacent wetlands, surface water runoff generated from the proposed development will need to be treated in accordance with City and Watershed District requirements. 3.4.2 Mitigation Measures Guidant continues to coordinate with the Rice Creek Watershed District to develop mitigation measures for treating storm water runoff associated with the proposed development. These measures include several surface water treatment strategies for each identified drainage area undergoing site plan changes. Thc strategics proposcd arc based on the best available information, but will require further study and discussion with the watershed district prior to finaj design. During the design phase of this project, soil and groundwater data will be required to ensure that appropriate trcatment areas and Best Management Practicc (BMP) dcsigns are selectcd. To the extent possible, storm water runoff from new impcrvious arcas will be directed into infiltration basins and wet ponds prior to leaving the site. Infiltration basins provide mitigation for the increase in runoff volume by infiltrating storm water and provide water quality treatment by filtering particulate mattcr from the nmofr Wet ponds provide water quality treatment by settling out sediment and attached nutrients and by skimming floating debris and provide rate control for the water leaving the site. Design of the treatment devices will be in accordance with the City and Watershed District water quality !,'llidelines. Design of the outlets for the treatment devices wij] be in accordance with the Watershed District rate control guidelines. 3.4.3 Implementation Information AGENCY RESPONSIBLE FOR REVIEW OF IMPACTS/MITIGATION PLANS City of Ardcn Hills Rice Creek Watershed District . Minncsota Pollution Control Agency (MPCA) Guidant Campus Master Plan Final .f',.'1itigation Plan - 6- January 2003