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11/03/2000 08:15 612 - 479 -4270 <br />• <br />TECHNICAL MEMORANDUM <br />TO: Randy Molin <br />Molin Concrete <br />FROM: Tim Colliton, PE, CIH <br />Todd Wenck <br />Wenck Associates, Inc. <br />RE: <br />Noise Measurement Summary <br />North Property Line — Lino Lakes Facility <br />Wenck File #0889 -05 <br />DATE: November 2, 2000 <br />PAGE 02 <br />CONFIDENTIAL <br />This Technical Memorandum presents the summary of the community noise measurements at the <br />Lino Lakes facility. The noise measurements were made in the early morning hours of October 24 <br />and 25, 2000. The purpose of the measurements was to assess the effectiveness of relocating <br />back -up alarms on the material handling equipment. <br />MINNESOTA NOISE RULES <br />These results are compared with the requirements of the Minnesota Rules pertaining to <br />community noise. The regulations are contained in Minnesota Rules, Chapter 7030 and are <br />administered by the Minnesota Pollution Control Agency. The noise rules are summarized below: <br />• Noise area classifications (NAC's) are defined for various types of land uses in the state. <br />The NAC's are numerically labeled from 1 through 4 and are described in Chapter <br />7030.0050. <br />• The noise emanating from an NAC and impacting a neighboring NAC is limited by the <br />rules. Different levels are specified for daytime (0700 -2200) and nighttime (2200 -0700) <br />periods. The noise is (usually) evaluated at the property line of the receiving NAC. <br />• NAC 1 generally includes land uses such as household units & other residential (including <br />farmhouses), medical services, transient lodging (e.g., hotels) and other cultural, <br />entertainment and recreational activities. <br />• For NAC 2, transportation facilities, retail trade, service establishments, and some outdoor <br />activities are included. <br />• NAC 3 covers manufacturing, utilities, agricultural and "all other activities not otherwise <br />listed ". <br />• NAC 4 covers undeveloped and unused land and water areas. <br />• The noise limits are listed below for NAC's 1, 2, &3: <br />Receiver Noise <br />• Area Classification Daytime Nighttime <br />Lso Lio Lso Llo <br />60 65 50 55 <br />2 65 70 65 70 <br />3 75 80 75 80 <br />