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J&T Rehab. Services TEL:512-628-5917 Feb 10 98 16:21 No.003 P.04 Project DescriptIon Ramsey County Interim Use Permit Concrete Crushing/BatchJng Ramsey County's Public Works Department is requesting an interim use permit to allow concrete crushing and batch mixing operations on a portion of a 20 acre County-owned parcel located east of Kent Street and north of Larpentuer Avenue. These operations will allow the County to recycle materials from the existing Larpentuer Avenue in the reconstruction of this roadway. It is anticipated that recycling the concrete materials will save Ramsey County and its taxpayers approximately $500,000. Neither concrete crushing or concrete batch mixing activities would be allowed to occur at the same time as tree and stump grinding activities. According to Section 1012.09 of the City Code, an interim use penn it is not required to be consistent with the land use designation identified in the Comprehensive Plan, nor is it required to meet all of the zoning standards established for the district in which it Is located. A request for an Interim use permit is processed in the same manner as 8 request for a conditional use permit. In reviewing a request (or an interim use permit, the City may attach conditions and will establish a specific date or event that will terminate the use on the property. In granting an interim use permit, the City Council must also ccgtermine that the approval of the interim use permit: 1) will not result in adverse impact on the public health and welfare; 2) ~he operation is safe to the public; and 3) there are no additional costs added to the site that would deter a permanent use at a later time. Ramsey County Public Works proposes to operate the portable concrete crusher on the site from April 1 through May 15 during 1998 and 1999, and during the construction season in 2000. All of the concrete to be crushed will come from the Larpenteur Avenue reconstruction project only r with no other projects being allowed to "piggy-back" on this activity. The concrete to be crushed would be stockpiled between crushing visits, with crushed concrete being stockpiled for reuse in the concrete mixed for new roadway material for Larpenteur Avenue. Approximately 20,000 metric tof'lS of concrete will be crushed each season, with approximately 2000 tons being crushed per day. Concrete crushing would only be allowed during the normal work week (Monday through Friday) with hours of operations limited to 8:00 am to 5:00 p.m. The total number of crushing days will not exceed 15 days per year. Water will be used to control dust during crushing operations. Concrete batch mixing would be allowed on two separate occasions per construction season, for a period up to five working days per occasion. Batch mixing generally requires long hours of mixing and pouring during these periods. Although specific times have not been established, it is possible that the site would operate from sunrise to sunset. During this time, trucks would be entering and/or leaving the site every 2-3 minutes. and equipment would be used to load materials into the mixer and remove the final product resulting in back-up warning system noise. The projected sound levels in decibels (dB) range from 57.6dB to 64_6dB for the concrete recycling activities. For comparison purposes, the measured sound levels for the tub grinder (taken during the demonstration on 1/17/98) range from 60.1dB to 72.4dB; and the measured weekday background sound levels (taken on 1130/98 and 2/4/98) range from 54.7dB to 68.4dB. The MPCA daytime residential standard is 60bB. Sound levels for other uses include 62dB to 65dB for background interstate traffic noise, 1 05dB to 110dB for a rock concert,.and 11 OdS to 120dB for a jet airplane. The County has indicated that it would notify effected residents In writing at least five days prior to the commencement of concrete crushing or concrete batching activities. The original list of residents to be notified would be provided the Community Development Director. with the understanding that other residents could be placed on the notification list by contacting the County. If granted, the interim use permit would be reviewed annually, including a review of south level measurements and dust count levels. The interim use permit would expire December 31,2000. The interim use permit could be revoked prior to this date for non-compliance with the specified conditions_