Philadelphia International Airport Fort Mifflin Sound Insulation Feasibility Study Presented to the: American Association of Airport Executives 7 th Annual.

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Presentation transcript:

Philadelphia International Airport Fort Mifflin Sound Insulation Feasibility Study Presented to the: American Association of Airport Executives 7 th Annual Airport Noise Mitigation Symposium October 9, 2007

Introduction and Background Fort Mifflin – The Fort that saved America! –In 1777 Fort Mifflin was the site of a fierce battle with the British Navy during the Revolutionary War. –For six weeks this small fort held off the British allowing George Washington time to build up his troops and defeat the British at Valley Forge. –The Fort was destroyed during that battle, but was restored in –The Fort was turned over to the City of Philadelphia in –In 1970, Fort Mifflin was recognized as a National Historic Landmark.

Fort Mifflin is located just East of the airport and is impacted by noise from aircraft arriving and departing. It is located within the DNL 70 dB noise contour, with some portions within the DNL 75 dB contour. Single event noise levels can exceed 90 dB (3 feet away from a lawn mower) depending on the type of aircraft and operational mode. Introduction and Background

Fort Mifflin is frequently used for educational purposes. –Thousands of school children, Cub/Boy/Girl Scouts, and other groups visit the Fort each year. Because of the close location of the Fort to the airport, tours and presentations are frequently interrupted by aircraft noise. Introduction and Background

Understanding the importance of Fort Mifflin to our nations history, the Division of Aviation chose, as a part of their first Part 150 Study, to recommend a feasibility study to determine if sound insulation treatments could be adopted at three buildings at Fort Mifflin. In May 2003, the FAA approved PHLs Noise Compatibility Program (NCP), and the mitigation measure for this study. Introduction and Background

Providing sound insulation to Fort Mifflin is unique from your typical residential sound insulation programs at an airport because it is recognized as a National Historic Landmark. Any modifications to a historic structure must ensure that the historic aspects of the structure are not compromised. This required extensive consultation and coordination with the State Historic Preservation Officer (SHPO), Philadelphia Historical Commission, and National Park Service. Introduction and Background

In developing the proposed treatment options, two principle strategies were adopted for treating architectural elements: –Minimize impacts to visible elements of the buildings that are important to their architectural and historic character; –Match existing styles and materials, but with products and materials that meet noise reduction goals. The first step in developing treatment options was to determine the level of noise reduction that would be necessary and identify paths for noise to enter each building. Project Approach

Each building underwent acoustical testing to measure exterior and interior noise levels to determine the Noise Level Reduction (NLR) needed. Federal Aviation Administration (FAA) regulations require that the sound insulation of habitable spaces result in: –An interior noise level not greater than DNL 45 dB; –Minimum noise level reduction of 5 dB Photo: Richard McMullin

Project Approach Building - Room Exterior DNL Interior DNL NLR (dB) Restoration Hospital/Mess Hall 1 st Floor Multi-Purpose Room Restoration Hospital/Mess Hall 2 nd Floor Offices Soldiers Barracks Exhibit Rooms Officers Quarters Exhibit /Caretakers Rooms

Restoration Hospital/Mess Hall Houses the Forts administrative offices, a multi-purpose room, video conference lab, and a kitchen. Windows and doors were found to be in fair to poor condition. There are window air conditioners installed in several locations. The chimney of the fireplace in the multi-purpose room is open.

Restoration Hospital/Mess Hall Our team developed treatment options for the this building. The following were recommended. –Doors – Replace existing interior and exterior doors. –Windows – Install single glazed double hung windows with glazed new storm windows w/ 7 air space. Would reduce noise by 15 dB on 1st floor and 10 dB on 2 nd floor –HVAC – Install 3 split HVAC systems, 2 (2.5 ton) units for the 2 nd floor and 1 (5-ton) unit for the 1 st floor. Condensing units would be installed outside in the back of the building.

Restoration Hospital/Mess Hall –Chimney – Install a damper on the chimney in the multi-purpose room. –Lighting – Replace the recessed lights in the ceiling since the holes create a noise path. –Attic Hatches – Replace the two attic hatches, on the 1st floor and 2nd floor, with sound insulating hatches. –Roof/Ceiling – Install one inch plywood on top of the attic joists to completely cover the attic floor.

Soldiers Barracks One of the main buildings used for educational purposes and exhibits. Sleeping quarters for overnight quests, such as the Scouts or war reenactment participants. A meeting room is also located in this building, as well as, a workshop on the second floor.

Soldiers Barracks The windows are double hung with a single glaze multi-lite sash and are in fair condition. They appear to be 20 th century replacement products. The doors are also in fair condition, with evidence of some deterioration. There are many gaps at the thresholds that allows noise to enter the building.

There are 3 independent, ductless, split package heat pumps within the building, which were found to be in fair to non-functional condition and a window air conditioner in the conference room. The heating system and ventilation within the building was deemed to be inadequate. Soldiers Barracks

–Doors – The ideal recommendation for the doors of this building was to reconfigure the vestibules to allow for the installation of a third door. –This was not acceptable to the historical agencies. The recommended treatment options included: –The final recommendation was for the gaps that exist in the interior and exterior doors be weather-stripped and filled to prevent noise from coming through the gaps.

Soldiers Barracks –Windows – Install single glazed double hung windows with glazed new storm windows w/ 7 air space. Would reduce noise by 13 dB on 1st floor –HVAC – Install two split package systems with condensing units in the back of the building and two indoor fan coil sections in the attic. Ductwork would be situated completely within the attic and new ceiling registers would be installed. The conference room would include a new 1-ton ductless heat pump. This was least obtrusive to the overall building appearance, but will require additional cost and structural engineering.

Soldiers Barracks Other treatments recommended included: –Chimney – Dampers should be installed on all functional fireplaces and non-functional fireplaces should be capped.

Officers Quarters Rooms on the second floor are used for overnight guests and is the location of the on-site caretakers living quarters. The first floor consists of various exhibits and storage rooms. Underwent renovations in the late 1980s when new windows and HVAC were installed.

Officers Quarters The windows are double hung with a single glaze multi-lite sash and interior screens and are in fair to poor condition. –There is a very poor fit on the 2 nd floor where the top sash overlaps the bottom by 10.

Officers Quarters The doors are also in fair condition, except at the rear of the building where there is evidence of deterioration. –There are many gaps at the thresholds that allow noise to enter the building. The HVAC is provided by a split package with a fan coil mounted in the attic and an outdoor condensing unit. The system is nearing replacement age (installed in 1980s). –There is a window unit in the caretakers quarters to provide AC to this room without having to cool the entire building.

Officers Quarters The recommended treatment options included: –Doors – Replace existing interior and exterior doors. –Windows – Install single glazed double hung windows with glazed new storm windows w/ 7 air space. Would reduce noise by 10 dB on 1st floor –HVAC Option 2 – The attic ducts and the current equipment would be completely replaced with two smaller fan-coils in two zones. This will split the building capacity between the top floor and the bottom floor of the building, adding more flexibility in operation and making it more economical.

Officers Quarters Other treatments recommended include: –Chimneys – The chimney in the rear exhibit room should have a damper installed. The fireplaces on the 2 nd floor should be capped if they will not be used in the future. –Lighting – The recessed lights on the 2 nd floor should be replaced. –Attic Hatches – The two attic hatches on the 2 nd floor should be replaced with sound insulating hatches.

Next Steps for Fort Mifflin The study has shown that it is feasible to provide sound insulation treatment to the selected buildings at Fort Mifflin. A final report has been prepared for the FAA for review and comment. The recommended sound insulation program will be included as a new mitigation measure within the Part 150 Update, which is in progress, to receive funding for implementation. Once the FAA has approved the measure, the DOA can obtain a grant to begin the implementation.