05/04/2022 EB Packet - Laserfiche WebLink

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3 Webster Loam (approximately 90%), which is poorly drained, moderately permeable, and in hydrologic group B/D. A saturated zone occurs at depths of 0 to 20 cm during the wettest part of normal years. Nessel fine sandy loam (approximately 10%), which is moderately well drained, is moderately permeable, and in hydrologic group C. Runoff is low, with water at 2-3.5 feet during the wettest part of most years. Ten soil borings were performed on the site and did not detect groundwater. Stormwater Management A stormwater management plan has been submitted and will receive a full review by the Engineering Department. The following summary review is based upon the same stormwater management plan and drainage calculations. The stormwater for both the existing and proposed conditions primarily flows to an existing pond at the north perimeter of the site. Stormwater captured from the property to the south, and a small amount from the project site, drains to the wetland on the south perimeter and then north to the stormwater pond. The pond will be excavated and modified as part of the project. Ultimately, the water heads to Peltier Lake. The site additions will bring the total impervious surface to 0.614 acre, which is approximately 41% of the total property area, which is well under the 75% impervious surface allowed in the Light Industrial zoning district. Existing Conditions 0.812 acre of the site drains to an existing stormwater pond. 0.043 acre drains to Otter Lake Road. 0.207 acre drains to an existing wetland on the south perimeter and is then piped to the existing pond. 0.467 acres drains to the east, then piped to the existing pond. Stormwater from the development south of the project site drains to the wetland on the south perimeter then is piped to the existing pond. Proposed Conditions Stormwater management under the proposed conditions closely resembles existing conditions. The increases in stormwater due to the increased impervious surface area will also be directed to the existing pond, as the pond was originally designed to accept more stormwater than it receives under current conditions. The drainage area to the pond will increase from 0.812 acre to 0.996 acre.