Laserfiche WebLink
REVIEW: <br /> <br />Wetlands, ground water and surface run-off: <br /> <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 /> <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 /> <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 /> <br />Staff 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 /> <br />Above ground fuel tanks and a septic system are proposed at the site. Tiller <br />has added these details as well as a proposed building for their staff to their <br />site plan for hot-mix asphalt plant. <br /> <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 /> <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 /> <br /> <br />