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1�� C �;�1 E��I �� ?�� i�� u�t �d�j.n- specifications for the proj ect, is not required tp complete the proj ect. Contrary 1,� {� �� 0 �� suggcstifln of Plaintiffs, the contractor has �hc option to ut�lizc �r reasonablemethod to complete the excavatip�z of rock. Blasting will �cst�,lt in noise levels peaking between 129 and 134 decibels. The contractor who is anticipatedto perform the job, however, intends to r�mave virtually a1130,000 to 40,000 liriC�l. feet of granite lae�.�'OG� by using a hydraulic jackhammer, which will penerai.e noise levels peaking at between 75 and 81 decibels. 24. Acceptable noise levels under the MPCA rules for residential areas may not exceed 60 decibels �-�ightc�{ (dBA} f i r 50% of the time in a one hour survey and 65 +�.BA's for 10% of the time in a o�e hour survey between �.G hours of 7;Q� AM and � d:d�li'iVt daily, Accc�table noise levels under the MPCA rules for "contract aqns�.�uct�o�. services" may not exceed 65 r��A for 50% of the tim,c in a onc-hour survey and 70 d�A for 10% ��' k3� time in a one hour survey �ietween the.hours of 'i_00 AM and IA.Q� PM ��.s 25. ,A.�tb,ou� it is undisputed that noise fTOrn blasting ��rii� bedrock in the project area wz)1 result in peak t�8.4�, levels between 129 and 134 and noise f'rom removin� �,xr.ata.ite in the proj ect area by hydraulic j ackhammer will result in pealc dB.� levels between 75 and $1 there was no evidence presented by the Pl�.iz�.tiffs to indicate a duratiqn�.l violation of the standard as ��ed during a survey period as contemplated by the n�c; in other words, although the loudest noisc a'�last or 1�.am�ncr might n�*�x� exceeds accepta6lc noise, th4re is �ott� to indicated in the record #hat [bis loud noise will continuc for i"A-weighred" rtscans a spccific weighit�g of chc sound p��ssure izu�! �r the purpose of determf�3'sn� the human respansc to sound. Mlr�n. Rulcs � 70;p_t�tl2p subp.2. 5 See Minra. Itufes � 7Q3{l.OD2p subp. 3, 7�nci 8; 7U30_�p5i} subp.2 and 7030.0040 subp. 2. �