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I I I I I I I' I I I I I I I I I I I I . ." A ---.. . lVI' Planning Committee Members 2 November 1994 Page 4 HGA and Acoustic Dimensions determined that the Worship Center required a volume calling for a ceiling height of 62 feet, on top of Roseville Lutheran Church's proposed basement, for proper acoustical properties. To address that height, Roseville Lutheran Church eliminated the basement and lowered the main floor to the level of the baseball field, which reduced the overall height of the Worship Center by one full story, or 14 feet. The Worship Center design now matches the Worship Center main Hoor with the existing basement level, and matches the balcony with the existing ground floor. This eliminates step baniers between the existing building and the new Worship Center. The proposed wall height of 25 feet is the minimum necessary to maintain this safety and public accommodation feature. The wall height has been minimized to hannonize the building with the neighborhood. Roseville Lutheran Church further requested that HGA and Acoustic Dimensions develop approaches to meet the church's acoustic requirements with a lower roof. As a result of that process HGA and Acoustic Dimensions have developed a unique acoustical design for the Worship Center, which now allows a longer reverberation time to be developed with less volume (in other words, a lower ceiling) than normal. We have been able to reduce the ceiling height by nine feet from what otherwise would be required to provide adequate acoustical qualities for this Worship Center. Why Roseville Lutheran Church's Worship Center Requires a Nominal40-Foot Roof Height To fit within the 3D-foot height zoning specification as viewed from the southeast, the roof could not extend more than ten additional feet up from the walls. Our professional opinion is that reducing the interior volume to that level would result in severely degraded acoustics for musical worship expression. Stripping out the partial mid-level ceiling and the moveable acoustic dampers would actually increase the roof height needed for proper religious liturgy acoustics. HGA concurs with Acoustic Dimensions that centering the upper volume, as shown in Roseville Lutheran Churchls site plan, is the acoustically and architecturally correct distribution of the required volume. We have analyzed redistributing that volume in a IItower" or "cupula, It and locating that form in various places on the roof. All of those proposals resulted in severe acoustic problems, lighting difficulties, and a roof height much taller that Roseville Lutheran Churchts proposal. The proposed Worship Center has the smallest footprint that affords adequate sightlines and acoustics for participants, and provides the space required for RoseviUe Lutheran Church's expanding ministry. The square footprint is the most efficient, affordable layout for this purpose. No other building shape will better serve the applicant's religious purposes, and blend with the surrounding neighborhood. -7-