pf_03196 - Laserfiche WebLink

Home

3.4 The site will be used for concrete crushing only (not concrete production) and the crushed material will be reused in Larpenteur A venue as an aggregate base. 3.5 The City may limit the hours of operation and duration ofthe concrete recycling operation to minimizing noise impact on adjacent neighborhoods. 3.6 The City may require dust control and watering measures to reduce infiltration and impact on adjacent neighbors. 3.7 The City may require specific truck driving patterns of delivery and removal to reduce noise. 4.0 Staff Comments and Findings 4.1 The operation of a temporary crushing operation reduces the amount of new material that must be brought to the site by 50% and the corresponding amount oflong distance trucking that must traverse the City. 4.2 The trucking will not cause excessive (beyond normal construction) noise or safety issues. Vehicle circulation plans will require trucks to pull up to the site in a circular pattern, reducing the backing and "beeping" noises. The activity is located within a recognized and maintained County public works activity arta. Road construction activity is exempt from MPCA noise standards. (The County will provide sound/noise measurement reports of the operation as requested by the City.) 4.3 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 Paul. 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 68.4dB. The MPCA daytime residential standard is 60dB. Sound levels for other uses include 62dB to 65dB for background interstate traffic noise, 105dB to llOdB for a rock concert, and llOdB to 120dB for a jet airplane. 4.4 The recycling of materials and operation will reduce the taxpayer cost of reconstruction of streets used by Roseville residents. 4.5 As a condition of the Interim Use Permit, the County must provide property dust control through screening and wetting the material, as well as erosion control. PF3196 - RPCA (042400) -Page 3 of 5