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REVIEW: <br /> • Wetlands, g round water and surface run-off: <br /> Review of aerial photos and the wetland inventory map have not indicated <br /> the presence of any wetlands on the subject property. Some intermittent <br /> wetlands are difficult to identify without field research. Staff has no reason <br /> to believe there are any wetlands on site, but if one is discovered appropriate <br /> actions will be taken according to the Wetland Conservation Act. <br /> Tiller is proposing to have a 5 foot separation between ground water and <br /> mining activities. If mining was proposed to take place into the ground water <br /> additional stipulations would have been placed on the operation. The <br /> attached conditional use permit states that an amendment is required to <br /> mine into ground water. <br /> Wash operations are not being requested at this time. Staff is concerned with <br /> the effect a wash operation at this site would have on the lateral migration of <br /> ground water contamination associated with the Elk River Landfill. To allow <br /> gravel washing in the future it will take an amendment to this permit and in <br /> depth analysis. <br /> IDStaff is not recommending periodic well sampling as a condition on this <br /> operation. The landfill samples wells within 2,000 feet of their property <br /> yearly, which will most likely include the potable water supply at this site. <br /> The lack of wash operations at this site and a five foot buffer between mining <br /> activities and ground water further reduces concerns. <br /> Above ground fuel tanks and a septic system are proposed at the site. Staff <br /> has requested a site plan of the hot-mix asphalt plant that shows these <br /> details, which includes a proposed building. If there are concerns regarding <br /> these issues, staff will address them to the Planning Commission at the <br /> meeting. <br /> The operation is required to have a NPDES permit from the Minnesota <br /> Pollution Control Agency (MPCA). This permit regulates storm water run- <br /> off. As part of the NPDES permit a "Storm Water Pollution Prevention Plan" <br /> is required. <br /> The City Engineer also reviewed storm drainage on the site. Tiller's plan will <br /> necessitate a storm water retention pond without an outlet in the northwest <br /> corner of the intersection of 221st Ave. and Highway 169. This is not <br /> necessarily a problem, but rather is it is Tiller's decision. <br /> • <br /> f:\shrdoc\b&z\stever\tilrcup.doc <br />