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david bC~ b associates. incocpocated 1313 5th street s.e.. suite322 · minneapolis. mn. 55414 · telephone: 612-331-4571 12 August 1993 MEMORANDUM TO: Roseville/ACI Noise FROM: David Braslau RE: Meeting with Residents on Noise Plan, 11 August 1993 The noise plan was presented and discussed. The general concern was that the difference in noise level from the plan would not be reduced enough to make any difference. The question was asked as to when the elements of the plan would be imple- mented. I noted that all plan elements unrelated to the new building would be completed by the end of August. The question was then asked what the next step will be if the residents still cannot sleep. I tried to explain that the noise will not go away, but will be reduced down to the 50 dBA level which is the only criterion against which noise control designs can be compared. The sound will still be audible but closer to back- ground and relatively steady. A major objective of the noise plan is to eliminate sudden and unexpected noise as well as variation in noise level. The sheet metal shields around fans was. criticized as being the wrong type of material for sound shielding since it will not stop the noise. I was unsuc- cessful in explaining that there is no point in using a heavy material when the barrier itself only provides 2 to 3 dBA of attenuation because of its small height. It would be helpful to observe these barriers first hand and determine how effective they really are. A number of side iss~es were raised during the meeting including the type of chemicals delivered and handled, odors, VOC control and safety issues. A major discussion was triggered by one resident on relocating the facility. He suggested that the building expansion and noise control plan would just make it more difficult for the plant to move in the future. As part of the Twin Lakes Redevelopment Area, the long term plan for the property includes high rise residential. (It is important that the current problems be ad- dressed even if long term planning proceeds. The City will have to make this position clear.) The same resident also complained that we are only considering nighttime noise while some residents may choose to sleep in the daytime. I noted that noise from the plant does not exceed the MPCA daytime standards and therefore cannot