07/15/2004 Env Bd Packet - Laserfiche WebLink

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• two cycles per second and the maximum particle velocity recorded, even as close as 15 to 20 feet from the pile driver, is generally less than one inch per second. On this basis, there should be no damage to the nearest house, which is 70 feet from one end of the bridge. It should be noted that the human body is quite sensitive, and thus occupants of the house might feel some small vibrations, or some crockery may rattle during the pile driving, but the effects on the structure should be none or negligible. A figure showing safe vibration levels for residential structures is attached as Exhibit G. If the project proceeds, the City will require a pre - construction survey and monitoring program based on specifications used by MnDOT. This could involve: 1. a pre - construction building survey within 100' of the project to document the existing exterior and interior conditions 2. crack displacement monitoring gauges to help verify distress if any should develop 3. continuously recording seismographs 4. submittal of a plan identifying schedule, vibration, equipment, and monitoring log 5. records of construction location, hours worked, depth, and equipment generating the vibrations 6. submittal of construction logs weekly including complaints 7. a test program prior to beginning activities to demonstrate the requirements can be met 8. sound levels should not exceed 90 decibels measured at 50 feet Maximum vibration levels could be established. If these limits are exceeded, the contractor would have to cease the activity exceeding the limit and design corrective action. 25. Nearby resources. Are any of the following resources on or in proximity to the site? Archaeological, historical or architectural resources? ❑ Yes El No Prime or unique farmlands or land within an agricultural preserve? ❑ Yes El No Designated parks, recreation areas or trails? 0 Yes ❑ No Scenic views and vistas? Q Yes ❑ No Other unique resources? ❑ Yes El No If yes, describe the resource and identify any project - related impacts on the resource. Describe any measures to minimize or avoid adverse impacts. • A background review of records, literature and archaeological research relevant to the history and prehistory of the area was carried out. No previously recorded archaeological or historical/architectural properties have been recorded in the area. However, there are numerous archaeological sites in the area of the Rice Creek Chain of Lakes, mostly located along lakeshores. Based upon this, the project area was determined to have potential for archaeology. A Phase I archaeological survey was carried out in November of 2000 (see Exhibit E). No historic or prehistoric remains were found in the project area. The report of these Environmental Assessment Worksheet Page 18 Pheasant Hills 12`h Addition