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• Wenck December 22, 2008 Mr. Mike Murlowski BelAir Excavating 2200 Old Highway 8 NW New Brighton, MN 55112 Re: Sound Mitigation Flan Recycle Crushing Operation New Brighton, MN Wenck Project No. 0980-07 Mr. Murlowski: ATTACHMENT FOUR Wenck A"ociattaa,Inc. 1800 Pioneer Creek Ctr. P.O. Box 249 Maple Plain, MN 65359-0249 (763) 4794200 Fax (763) 479-4242 E-mail: wenckmp®wanck.com E: DRAFTO This letter presents the sound mitigation plan for the recycle crushing operation at your New Brighton facility. Baseline sound measurements were made at a nearby residence in September 2008. The measurements were made with and without the crushing plant in operation. A copy of the report of these measurements is attached for reference. As indicated in the report, the background (non-operating) sound levels are 1.4 to 2.1 dBA less than the operating sound levels. All sound levels (operating and non-operating) were well below both the Minnesota Noise rules and the New Brighton zoning code limit. The goal of this sound mitigation plan is to reduce the sound from the crushing operation to below the background sound level_ To accomplish this, the height of the existing berm along the west side of the property should be increased to at least 25 feet above adjacent crushing/material handling activities. The berm should extend to the north and south of the activities as far as practical and at least a distance equal to the height of the berm. That is, if the berm height is 25 feet, the berm should extend at least 25 feet north and south of the activities. A sketch of the general arrangement of the berm, crushing equipment and sound receiver is attached. The berm material can be stored recycle material or other impermeable material. The berm is expected to reduce sound from the operations to well below the non-operating sound levels measured in September.