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Mayor Hosterman closed the public hearing. Councilmember Sullivan asked how the guidelines propose to address cumulative noise sources that may end up exceeding 60 decibels at the residential plane. Alan Rosen, acoustical consultant with Rosen Goldberg Der & Lewitz, said this was not addressed in the guidelines and would likely be managed on a case by case basis. He explained several methods but said it would be an iterative process to try and identify the dominant noise source and likely result in all sources being asked to lower their amplification. Councilmember Sullivan strongly recommended that staff develop a clear process for identifying noise sources, enforcing a reduction in amplification, and then repeating measurements to ensure compliance. He said enforcement is something they discussed at the Task Force level and is of significant concern. He asked if the increase in operating hours and noise levels would result in increased police presence or active monitoring efforts. Police Chief Spiller said the department's downtown presence would be very similar to its current posture. Specifically, the guidelines will not result in additional staff positions or formal redeployment to the downtown area. Councilmember Sullivan asked that the staff and Council revisit the idea of monitoring and enforcement as the effects of the guidelines evolve. Councilmember McGovern asked how many officers are on shift between the hours of 11 p.m. and 7 a.m., and whether any are specifically assigned to the downtown. Chief Spiller said the number varies from as few as 5 to as many as 20 officers due to overlapping shifts and depending on the community activities scheduled. Councilmember McGovern said that while everyone likely supports vitality. there are definitely consequences if not done properly. She noted at least one local bar that has increased police presence as their closing time approaches. She asked whether it would be possible to increase presence downtown between 11 p.m. and 2 a.m. in order to discourage some of the more inappropriate behavior that tends to accompany public drunkenness. Mr. Fialho advised against inventing that directive in the document but said the Chief could certainly emphasize that in terms of his deployment. Councilmember McGovern asked how staff reconciles the Negative Declaration, which says the increase in allowable noise levels is insignificant, with the General Plan statement that an increase in exterior noise of more than 4 decibels is required before the increase is considered significant. Mr. Rosen noted the General Plan identifies an increase of more than 4 decibels. He explained that the General Plan refers to a 24-hour average noise level, which is different from instantaneous noise levels like those being proposed here. He also explained the perception of noise relative to changes in decibels. He said that increases generally start to be noticeable, but not dramalic, at an increase of 5 decibels and 10 decibels the point at which one might perceive a doubling of loLdness. He felt than an increase of 4 decibels would be just a little more than noticeable, if at all. He also explained that while the perception does vary based on the original noise level, it is generally less noticeable at higher levels due to the compression in the sound. 11