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materials into the mixer and remove the final product resulting in back-up warning system noise. 3.4 In an effort to ascertain the noise impacts of this operation, Ramsey County has obtained sound level measurements of a concrete recycling operation at a gravel pit in South Saint Pau1. Based on the readings taken at this site, projected sound levels were calculated for the Kent Street site. Four separate receptor sites were utilized for these projections (497 Wagner Street, 512 Glenwood Avenue, Ramsey County Women's Detention Center, and corner of Mackubin and Larpenteur). 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 1/30/98 and 2/4/98) range from 54.7dB to 68AdB. The MPCA daytime residential standard is 60bB. Sound levels for other uses include 62dB to 65dB for background interstate traffic noise, 1 05dB to 11 OdS for a rock concert, and 11 OdS to 120dS for a jet airplane. 4.0 STAFF COMMENT 4.1 Section 1012.09 of the City Code outlines the provisions for interim uses. An interim use 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 a request for a conditional use permit. In reviewing a request for an interim use permit, the City may attach cOi1ditions 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 determine that the approval of the interim use permit will not result in adverse impact on the public health and welfare, that the operation is safe to the public, and that there are no additional costs added to the site that would deter a permanent use at a later time. 4.2 The generation of dust and noise, truck traffic and circulation, and erosion are major concerns with this 20 acre site. In an effort the address the City's concerns, Ramsey County has agreed to plant up to 40 coniferous trees on top of the berm at the northern edge of the site, repair the erosion near the culverts that drain the site on the north side of the property, and limit general use hours of the site from 7:30 am to 7:00 p.m.. 4.3 The proposed interim use will generate additional noise, dust, and truck traffic. For this reason, permit conditions are needed to mitigate these impacts from creating significant off-site impacts. Stockpiling and batch mixing of materials should be closely monitored and be closed to the public to reduce possible injury or vandalism. Gates or fencing may be an acceptable solution. In addition, water must be used on the crushing operation to reduce dust. PVD~ &50 - NO\\~w.t1 0(\ - ~Ltl red f'~1.( - InfVrlYlo.t1onaj PF#2985 - RPCA (02/11/98) - Page 3 of 5