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<br />-} <br /> <br />18. <br /> <br />! <br />1 <br />1 <br />I <br /> <br />J <br /> <br />-1 <br />J <br /> <br />Water Quality - Surface Water Runoff: <br />a. Compare the quantity and quality of site runoff before and after the <br />project. Describe methods to be used to manage and/or treat runoff. <br /> <br />The Centre Pointe Business Park has been developed with sites meeting <br />the Business Park PUD requirement of 25% green space. The 1997 EA W <br />was developed assuming that 25% of the developed area would be green <br />space. The proposed improvements to the Veritas site will result in <br />approximately 28% of the site reserved as green space. The increased <br />green space will result in a reduction of the quantity of surface runoff from <br />this site and ultimately reduce the total runoff identified in the 1997 EA W <br />from the <br /> <br />Business Park. In addition to the increased green space, the Veritas site <br />will utilize infiltration areas. These infiltration areas will capture <br />stormwater runoff from the surface parking allowing for the runoff to <br />infiltrate into the ground and sediments to be collected in the infiltration <br />areas. The implementation of the infiltration areas will also result in a <br />reduction in the quantity of runoff from the Veritas site and total runoff <br />identified in the 1997 EA W. <br /> <br />A regional stormwater pond located just south of the site has been <br />sufficiently designed to handle the site runoff. The proposed site will <br />produce a peak flow of approximately 67.35-CFS and a total quantity of <br />6.81 acre-feet for a 100-year event. Every attempt has been made to <br />maximize the areas where surface runoff can flow to infiltration beds. <br />These actions will properly pre-treat drainage to the wetlands. The overall <br />design has met the water quality standards as accepted by Rice Creek <br />Watershed District. <br /> <br />b. <br /> <br />Identify the route(s) and receiving water bodies for runoff from the <br />site. Estimate the impact of the runoff on the quality of the receiving <br />waters. (If the runoff may affect a lake consult "EA W Guidelines" <br />about whether a nutrient budget analysis is needed.) <br /> <br />The site will drain to the existing regional stormwater pond through the <br />storm sewer system. The regional pond will drain to DNR Wetland 50- W <br />(a MnDNRpond south of the regional pond). Wetland 50-W has a <br />drainage area of about 504-acres, which includes approximately 19-acres <br />from the Veritas site. The existing regional stormwater pond has been <br />designed, constructed and improved by the City of Roseville and the Rice <br />Creek Watershed District to accept the runoff from the site. The <br />infiltration beds and regional pond will1reat the quality of the receiving <br />waters. The quality of wetland 50- W is not anticipated to be adversely <br />affected by this project. <br /> <br />Page 17 <br />