Laserfiche WebLink
<br />. <br /> <br />October 31, 1980 <br /> <br />Page _2_ <br /> <br />the existing plant. <br /> <br />Plan C consists of building a baffled weir around the existing <br />catchbasin #2. A weir in this location would interfere with normal <br />traffic flow however. Typically, large trucks drive over the <br />catchbasin on their way to the scale or docking bays in the plant. <br />It would be difficult for the semi-tractor-trailer trucks to go <br />around the weir upon entering the site and manuevering to back into <br />the narrow doors on the north end of the building. An alternate <br />weir type to be constructed inside the catchbasin was investigated, <br />however was found not to meet the design parameters necessary to be <br />effective. <br /> <br />Plan D consists of building a baffled weir around catchbasin #1 and <br />reducing the inlet capacities of both catchbasins 1 and 2. The <br />parking lot and green area will provide for 0.33 of the 0.43 ac-ft <br />of storage needed for drainage areas 1 and 2. An overflow swale <br />to the west and south is needed under this plan to prevent flooding <br />of adjacent property due to catchbasin capacity reduction. I <br />estimate the work necessary to construct this plan to be in the <br />$1,000 range. This construction would affect 1.9 acres or 79% of <br />the site. <br /> <br />Major reconstruction of the parking lot and plant to achieve water- <br />shed criteria has been rejected as bBing inconsistant with watershed <br />policy. We believe Plan D, the baffled weir, restricting inlet capa- <br />city, providing an overflow swale, and sediment control during con- <br />struction, to be the only feasible plan to achieve substantial com- <br />pliance with the watershed regulations. <br /> <br />We will be happy to discuss this report and exhibits with you on your <br />Engineers as may be needed. Please do not hesitate to call us <br />should you have any questions or need additional information about <br />this project. <br /> <br />Sincerely, <br /> <br />~V~ <br /> <br />Roger W. Nelson, P.E. <br /> <br />cc: Hickok & Associates <br />Gordon Rendering Company <br />G. Robert Johnson, Popham-Haik <br />Les Proper, City of New Brighton <br /> <br />RWN/sg I <br />