Bow-Concord I-93 Noise Study. Noise Study Informational Meeting

Transcription

1 Study Informational Meeting December 14, 2010

2 Presented By: Donald Lyford, PE Project Manger NH Department of Transportation Gene McCarthy, P.E. Project Manager McFarland Johnson Fritz Hust Modeler McFarland Johnson

3 Agenda Background Study Procedures Potential Locations impacted by Highway Measurements Modeling of current and future noise levels Abatement Analysis and Conclusions Questions/Comments

4 Procedure Determine Land Use Measure and Traffic Predict Levels with Model Conduct Impacts Analysis Conduct Abatement Analysis Abatement Considerations Recommendations

5 Abatement Criteria Activity Category A B C D E L Aeq1h * 57 (Ext.) 67 (Ext.) 72 (Ext.) No Criteria (Ext.) 52 (Int.) Description of Activity Land on which serenity and quiet are of extraordinary significance and serve an important public need, and where the preservation of those qualities is essential if the area is to continue to serve its intended purpose. Picnic areas, recreation areas, playgrounds, active sports areas, parks, residences, motels, hotels, schools, churches, libraries, and hospitals. Developed lands, properties, or activities not included in Categories A and B above. Undeveloped Lands Residences, motels, hotels, public meeting rooms, schools, churches, libraries, hospitals, and auditoriums. * Hourly A-weighted sound level in decibels (dba). Note: Ext. = Exterior; Int. = Interior.

6 Study Area

7 Analysis Locations Analysis Locations Description Activity Category Approximate Number of Receptors Measurement Sites A Residential area along I-93 Northbound, southeast of the I-89/I-93 Interchange in Bow, New Hampshire. B 12 R1 R2 B Residential area along I-93 Southbound, southwest of the I-89/I-93 Interchange in Bow, New Hampshire. B 20 R3 R4 R5 C Residential area along I-93 Southbound northwest of the I-89/I-93 Interchange in Bow, New Hampshire B 30 R6

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10 Analysis Location A Receptor # Highest 2010 Measured Level (dba) Modeled PM Peak Hour Level (L Aeq1h ) 2030 NO-BUILD ALTERNATIVE Modeled PM Peak Hour Level (L Aeq1h ) 2030 BUILD ALTERNATIVE Modeled PM Peak Hour Level (L Aeq1h ) Activity Category/ Abateme nt Criteria 3 Abatement Analysis Required? R B/66 NO R B/66 NO 1. Numbers in bold italics approach or exceed the Abatement Criteria or represent a substantial increase in noise levels. 2. level during 15-minute measurement; does not necessarily represent peak noise conditions. 3. Abatement Criteria (NAC) minus 1 dba.

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13 Analysis Location B Receptor # Highest 2010 Measured Level (dba) Modeled PM Peak Hour Level (L Aeq1h ) 2030 NO-BUILD ALTERNATIVE Modeled PM Peak Hour Level (L Aeq1h ) 2030 BUILD ALTERNATIVE Modeled PM Peak Hour Level (L Aeq1h ) Activity Category/ Abateme nt Criteria 3 Abatement Analysis Required? R B/66 YES R B/66 YES R B/66 NO 1. Numbers in bold italics approach or exceed the Abatement Criteria or represent a substantial increase in noise levels. 2. level during 15-minute measurement; does not necessarily represent peak noise conditions. 3. Abatement Criteria (NAC) minus 1 dba.

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16 Analysis Location C Receptor # Highest 2010 Measured Level (dba) Modeled PM Peak Hour Level (L Aeq1h ) 2030 NO-BUILD ALTERNATIVE Modeled PM Peak Hour Level (L Aeq1h ) 2030 BUILD ALTERNATIVE Modeled PM Peak Hour Level (L Aeq1h ) Activity Category/ Abateme nt Criteria 3 Abatement Analysis Required? R B/66 NO 1. Numbers in bold italics approach or exceed the Abatement Criteria or represent a substantial increase in noise levels. 2. level during 15-minute measurement; does not necessarily represent peak noise conditions. 3. Abatement Criteria (NAC) minus 1 dba.

17 Abatement Analysis A 10dB Reduction is a Substantial Benefit A 5dB Reduction is minimum Reduction for Benefit Criteria is no more than $30,000 per benefited residence Location B the only one where abatement would provide benefit

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19 Conclusions Locations A & C do not meet threshold for benefit Cost exceeds criteria limit for Location B No Barriers are therefore proposed

20 Questions?