Agenda - Council - 12/11/2007 - Laserfiche WebLink

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Exhibit A Diamonds Petition for EAW December, 2007 Page 7 Because an increase in parking spaces is not proposed, even if all 430 parking spaces where full and each vehicle brought 10 people, there would only 4,300 people. The estimated event attendance is 700 people. Several measures can be incorporated to mitigate the environmental impacts. The conditional use permit amendment will be. in effect for one year, and will be subject to evaluation by the City Council if the Owner wishes to extend it next year. A special events permit must be obtained for each type of event (motocross, music events, demo derby and rodeos bull riding). An Erosion and Sediment Control Plan and a Storm Water Pollution Prevention Program (SWPPP) will be submitted and approved as part of the permitting process. The Owner will construct an additional berm to screen visual and noise impacts. The Owner will ensure that events comply with a daytime L10 of 65 dB(A), a daytime L50 of 60 dB(A), a nighttime L10 of 55 dB(A), and a nighttime L50 of 50 dB(A) at residential and park areas, according to Minnesota Rule 7030.0040. Daytime is defined by Minnesota Rule 7030.0020 as 7 am to 10 prn and nighttime from 10 pm to 7 am. If the events are not within the acceptable sound limits as set forth, the conditional use permit amendment will not be renewed for the 2009 event season. The noise standards have been set forth for the entire state of Minnesota in order to protect human and wildlife well-being. However, sound is affected by the environment it is created in. The most accurate way to determine the noise effects of the proposed events is to conduct noise monitoring following the procedures in Minnesota Rule 7030 at sensitive receptor locations during an actual event at the proposed location. If the sound is above the levels set out in the Rule, then it should not be allowed to continue because it breaks the Rule. An EAW is not necessary, as research into other noise studies that have been conducted in other locations will not determine the actual effects on this location. Based on the above discussion, an Environmental Assessment Worksheet is deemed not necessary for this project. -252-