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THU 16:05 F.0 6124825232 RAMSEY CO PUBLIC WORKS Q 003 Wagner Stmet, Roseville, )512 Glenwood Avenue,Roseville , (C)the Ramey County Woumn's Detention Center, and(D)a new house being eonstmcted at the southwest corner of l ackubin and Larpenteur in Sint Paul.The MPCA daytime noise standard for residential receptors is L50=60 dB(A), The sound levels from the proposed concrete mcycling operatiorx projected for the res identl al receptors are lower than the measured weekday background sound levels, with the exception of the omen's Detention Center. Projections were made assuming flat land with no obswictions. the actual sound levels expe fenced at the re si den ti al receptor sites should be lower due to the sound barrier effect of gravel stltpiles,be=, and vegetation. Each emsbing installation is unique and no one can accurately predict the wvud level of a specific mmhing installadon.. we would not know the a al sound levels from our prQpnsed concrete recycling plant until it was in operation. Also included on the table are 1esult3 from sound mcasurcmonts made ou January 17, 1998 during a dernonstr don of a NSP tub &Mder; weekday hack and sound level measurements recorded can January 30 and Fobruary 4, 1998; and the MPCA resi&ntial sound level standard. 'SABLE 2 Sound Source or Standard Sound Levels in dD(A) Site A Site B site C. Site D Tub Gfin&r measured) 60.1 72.4 Concrete Recyclin(p ro'ected) 58.9-59.7 7-6,58.7 60.2,61.3 63.7-64.6 Weekday B ac ground Sound Level 557.5-60.1 57.5-60.1 54.7 62.7-68.4 (measured MP CA Da Residential Standard 601 601 60 60 NSA rnoisa standuds are a L,50 of (A) during daytime for a residential area. During the NSP Tub Grinder demon&ation the L-EQ sound level recorded at the clowst resi&ncq which was 340 foet north of the tub grinder,was bo+l dB(A).This site was at a lower elevation than the tub grinder,which would increase the Mhution angle and therefore incrme the effectiveness of sound attenuation by the berm constructed at the south edge of the tub Crider site+ The L-EQ noise level recorded at the sad residence, which wam 520 feet north of the tub grinder and 30 feet higher than the closest residence, was 72.3 dB(A).'his site is at a distance of 180 feet fin then away than site "A"but is at a higher elevation, at but 30 feet higher than site "A",thus reducing the diffraction angle of the sound path over the berm cotnpamd to site"W',