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�rosion Control: Erosion control will comply with an approved stormwater pollution prevention plan (SWPPP). Best Managementpractices will be utilized, including installation of a silt fence along the perimeter of the recycle staging area. Silt fence will also be placed around the resultant crushed material stockpile to prevent erosion prior to re-use of the material as road base. Dust Con�rot: Dust will be managed on site per the MinnesotaPollutionControl Agency's standards for non-metallic processing plants. Dust results from handling materials having a high percentage of content that would pass through a�200 sieve (200 openings per sc�uEa�e inch). Siits and ciays can have 50% or more material passing the #20t� sieve. Recycle aggregate base materials have a content ranging from 3 to 7% that would pass through a#2At} sieve. Additionally, fractured concrete particles tend to farm a crust once they are stockpiled; this crust minimizes the amount of dust that is generated. During the crushing process, spray bars on the crushers add water to the resultant pile to assist in crust formation. Stockpiles are monitored weekly to determine the moisture content and additional water is added if needed; a minimum moisture content of 1.5% is required. In areas of truck and equipment traffic, water will be applied to control and prevent fugitive dust. Street sweeping will be employed as necessary to maintain dust free public roadways. Vibrations: A seismograph will be installed to monitor vibrations at the beginning of the crushing cycle to confirm vibration thresholds are not exceeded. Any vibrations in excess of acceptable thresholds will result in the crushing operationsbeing modified to conform to levels which prevent noticeable impacts to adj acent properties. Please contact me with any questions you may have or if further infc�rmatian is required. Sincerely, It n� �i�a�� � � r�sa _'� �'rro��r��xl� Director of Land Development Cc: Joe Samuel, RLK Incorporated