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• MAY 24 '98 14:43 FROM DAVID BRASLAU ASSOC 2.0 NOISE ISSUES PAGE.004 The noise issues discussed at the mediation meeting on 16 April 1996 are summarized below. A copy of the overheads used during that presentation is included here as APPENDIX A. _sZ O•e - • -. •• •le.t• • a.• • • • • •. ••• -. �►Y • • • . •' The primary source of noise at these homes is traffic on 66th Street and the Crosstown. Even though the Crosstown is a half -mile from the area, it is elevated and carries a rather high traffic volume. The observed weekday daytime background level was 50 dBA. Saturday background was observed to be 42 dBA which is representative of levels that might be expected during the evening hours. This is several dBA lower than the 45 dBA background level estimated at the mediation meeting. The fan(s) that are used to keep the dome inflated will be enclosed or shielded by the bleachers on the east side of the athletic field. Although no sound level was provided for this fan, it was described as a low flow/high pressure fan which generally emits less sound than a nigh flow/low pressure fan. With an est4mated level of 65 dBA at 3 feet, the level is estimated to be less than 40 dBA at the residential area which is at or below the estimated ambient level. • Noise level at hmnP om the hea g fan The heater and fan to maintain temperature in the bubble will also be shielded by the bleachers. While a sound level of 65 dBA was reported for this source prior to the meeting, a level of 75 dBA was observed at the Augsburg bubble. With careful shielding delis equipment, the sound level could be reduced to 40 dBA, or below at the residential area to the west. Some cycling of this equipment (and hence associated sound) will occur depends RE upon temperature ,311N o 9 2.O on Of 1-1 %0 LASES Academy of the Holy Angels - Noise Assessment Page Z