2004-137 Council Resolution - Laserfiche WebLink

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• • • September 3, 2004 Mr. Ed Vaughan 1432 Pheasant Hills Drive Lino Lakes, MN 55038 Re: Work plan for Noise, Vibration and Pre - construction building Survey in conjunction with theBridge and Road Construction at Pheasant Hills Preserve 12th Addition in Lino Lakes, Minnesota; STS Project 98623 -B Dear Mr. Vaughan: The site of the proposed Pheasant Hills Preserve 12th Addition is a ridge of higher and or "island" totally encircled by a wetland. In order to construct this project, it will be necessary to build a bridge across the wetland. Because of the depths of compressible organic soils at the bridge site, we have recommended that the bridge should be supported on driven piles. Your consulting engineer for this project, Loucks and Associates, Inc., has asked us to provide for the planned activities to monitor and control the potential noise and vibration impacts to the adjacent residential neighborhood to the west, associated with the pile driving during this construction. We will also comment on the planned pre - construction building survey of structural conditions of these houses. Pre - Construction Building Survey Prior to the actual construction of any of the earthwork or pile driving for the bridge construction, STS Consultants, Ltd. on behalf of the developer will conduct an on site observation of each of the residences within 200 feet of the proposed construction. We anticipate that eight houses will be observed. Permission to enter into the individual residences will be arranged with the home owner. The inspection of the home will be conducted by an experienced building condition inspector from STS in conjunction with a representative of the City of Lino Lakes and the home owner. Photographic, video and written records of the interior and exterior of the residence will be made, with any existing cracks or distress to the house detailed. If cracks are observed, crack monitoring gaugesdevices will be installed and photographed as initial conditions and monitored during the construction. A representative of STS will be available on site during the pile installation activities to receive communication from the residents and further assess potential complaints of distress. Noise For this project, the use of steel pipe piles have been recommended for support of the bridge. The pile driving hammer creates impulsive noise (series of repeated sounds) which would slightly exceed the noise standards for a Noise 1 classification area, namely 60 to 65 decibels. Thus the pile driving should be restricted to no earlier than 8 AM, and no later than 4 PM, with no pile driving on Saturdays and Sundays. STS will monitor ambient sound levels within the neighborhood prior to start of construction to determine a base level of background noise. During the pile driving operations, STS will monitor and record noise levels intermittently adjacent to the pile driving equipment, at a distance of fifty (50) feet from the equipment and at adjacent to the exterior of selected houses in the neighborhood, closest to the construction. The letter from the City dated August 17, 2004, sets a sound level limit criteria of 90 decibels when measured at 50 feet from the equipment. If this sound level is exceeded, modifications to the pile driving hammer, cushion block or fuel setting will be implemented to reduce the noise level. STS will coordinate with the piling contractor and developer to verify implementation of any such modification, and record retesting of the system. Vibration