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N atural Environments Corporation <br />1 1 10 EvsRaRKKN Lank N orth <br />PLYMOUTH, Minnesota 55441 <br />suivm <br />PHONE (763) 544-8002 <br />Pax (763)548-0204 <br />Construction Specifications: <br />The glacial boulder walls will be constructed with boulders ranging in <br />sizes from 24 to 36 inches in diameter. More stabitit/ is achieved by using <br />larger boulders and installing each course of boulders with more setback, <br />versus a “straight-stacked” method. The walls will be backfilled and <br />compacted with a soil and day mixture, reason being, the mixture helps the <br />boulders to settle and naturally lock together. Meticulous care is taken in <br />pledng the boulders together and closing off the gaps. Also, by avoiding <br />fabnc behind the wail, groundcover will be planted in the gaps to contribute <br />to the stabilization of the boulders and the natural look of the wall. <br />The granite steps will have a base of compacted gravel. The base will <br />be excavated in virgin soil and approximately 10-12 inches of 3/4" gravel will <br />be plate tamped every 2 inches to provide for maximum stability. The step <br />treads will maintain a 12-15 inch width with the rough surface facing up for <br />traction. A hand-rail meeting all applicable codes will be installed. <br />Erosion Control Specifications: <br />A silt fence will be installed at the top of the hillside and also on the <br />shoreline to prevent any erosion from filtering into the lake. In areas around <br />boulders and steps, plant material and shredded hardwood mulch will be <br />installed. In open areas where equipment may have damaged the existing <br />terrain, a Fulerra Erosion Contrci./Re-Vegetation Mat will be laid down. <br />^ v ' <br />V-^ C; <br />-