9.3. SR 08-15-1994 - Laserfiche WebLink

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.M~ L'ONSUL TING ENGINEERS ClliJ[ ENGINEERING EN'IIWNMENT AI MUNiCJPAl P!ANNING STRUCTURAl eSURVEYING iRAFFIC TRANSPonATlON 1326 Energy Pork Dr;"" SI. Paul, MN 55108 612.644-4389 Fox: 612-644-9446 .9800 Shelard Parkway M;nneo~is, MN 5544 I 612-546-0432 FadI2-544-6398 AUG - 9 1991 r- August 8, 1994 Pile: 230-000-00 Mr. Phil Hals Street/Parks Superintendent City of Elk River 13065 Orono Parkway P.O. Box 490 Elk River, MN 55330 . RE: PROPOSED CITY PARK BETWEEN THE DOWNTOWN CINEMA BUILDING AND ALLEYWAY Dear Mr. Hals: The City of Elk River is proposing to construct parkland located in downtown Elk River between the old cinema building and adjacent alleyway. The park will consist of a concrete patio at street level and transition into a gradually sloped area to the back alleyway along the river. The park will be contained in an approximately 64 feet wide by 20 feet deep by 115 feet long abandoned basement which opens to the riverfront. The existing basement walls are constructed out of cast inplace concrete and vary in thickness from approximately 24 inches at the footing base to 12 inches at street level. The walls are founded on a 16-inch thick cast inplace concrete footing with undetermined width. The walls and footings appear structurally sound and stable. The basement floor is constructed out of cast inplace concrete. There is tree and brush growth through several cracked and broken areas within the concrete floor. To construct the proposed park, the City intends to clear and remove the trees and brush from the basement floor, seal off the basement floor with a bituminous cap, waterproof the concrete walls with a polysheet or mastic material, and backfill the basement with a well- draining, granular fill material. The granular fill material will be provided from a City street project. The park construction is scheduled for sometime in September. The fill materials will also be well compacted and graded per the design of the park. Based on the material and method of construction, the City has concerns regarding potential damage to the cinema building support walls. The fill material will exert significant outward lateral pressures against the basement walls. The north and east walls are adequately retaining the fill materials below the street and alleyway. The south wall adjacent to the cinema building probably was constructed similar to the north and east walls, and also has adequate inward retaining capacity. There are at least a few known open spaces behind this