Products / Services #4949166

Rail Yard Used for Locomotives Run Continuously at Night and Weekends Subject of Community ComplaintsPerformed Noise Measurements in Adjacent CommunityUntended, Extended Measurements Made to Quantify Extent of ImpactsShort-Term, Third-Octave Band Sound Levels Sampled Repetitively to Differentiate Yard and Non-Yard Noise SourcesNoise Control Options Evaluatedfor Operations, Equipment, Facilities, and Yard-Perimeter Noise Barrier Considering Rail Yard Constraints

Requirement for Sound Power Level Testing to Customer SpecificationDefined Acoustical Test Chamber Options for Equipment ManufacturerDesigned Reverberant Room Facility and Data Acquisition System Test Chamber Qualified for Discrete Frequency Measurements per American National Standards (ANSI)Room Calibrated via Reverberation Time MeasurementsDetermined Source Sound Power EmissionsEvaluated Compliance with Customer Specification

MilitaryPolice Training Facility Adjacent to Large Residential DevelopmentSurveyed Ambient Noise to Differentiate Shooting and Non-Shooting Ambient SourcesEstablished Noise Assessment CriteriaMeasured Firearm Sound Level EmissionsMapped Range Noise Exposure Contours via U.S. Army Small-Arms Range Noise Assessment Model (SARNAM)Evaluated Operational and Range Design Mitigation OptionsEstimated Benefits of Individual Range Perimeter Noise Barriers

Measured Noise and Vibration with Respect to Manufacturer Specs, Building Occupant Requirements, and Environmental CriteriaTested--Fans, Chillers, Cooling Towers, Rooftop Air Handlers, Diesel-Generator SetsMitigation Treatments Identified

Objective to Develop Quieter PavementTests Performed at Minnesota DOT MnROAD Testing Facility and LaboratoryOn-Board Sound Intensity (OBSI) Test Method per Standard Test Method for Measurement of TirePavement Sound Intensity (AASHTO Designation TP 76)Conducted with ASTM P22560 R16 Standard Reference Test Tire (SRTT)Acquired in Conjunction with Pavement Texture Profile via Laser Profilometer (ROSAN)

Predicted Highway Traffic Noise at Dwellings and Noise-Sensitive Outdoor AreasAssessed Impacts re Federal (23 CFR Part 772), State, County, and Local CriteriaUsed Federal Highway Administration (FHWA) Traffic Noise Model (TNM) Computational MethodEvaluated Compliance with U.S. Dept. of Housing and Urban Development (HUD) FHAVA Noise GuidelinesDesigned Noise Barriers (i.e., Berms andor Free-Standing Walls) to Mitigate Outdoor ImpactsArchitectural Sound Isolation Analyzed with Respect to Indoor CriteriaBuilding Features for Interior Soundproofing DefinedEstimated Traffic Noise Exposure ContoursOn-Site Noise Measured to Calibrate Noise PredictionsExpert Testimony Provided Documenting Procedures and Results

Assessed Noise and Vibration from Proposed Transit Projects with Light Rail Vehicles, Bus Rapid Transit (BRT), and Diesel BusesSurveyed Existing Ambient Noise along Rights-of-WayMeasured Ambient Ground VibrationTested Noise Emissions from Rail Vehicles on Both Tangent Track and in Tight-Radius CurvesMeasured Diesel Bus Noise Sound LevelsAssessed Noise Exposures with Respect to Federal Transit Administration (FTA) and American Public Transportation Association (APTA) CriteriaEvaluated Mitigation Options and Designed Noise Barrier WallsEstimated Potential Vehicle Pass-By Noise Impacts to Recreational Land UsesIdentified Risk Impacts from Wheel Squeal and from Groundborne VibrationMet with Public to Present Assessment Findings and Respond to Community Concerns

Assessed: Surface Mining Extraction and Processing Facilities, Asphalt and Concrete Batching Plants, Construction Sites, Power Plants, and Trucking FacilitiesSurveyed Existing Ambient NoiseUnattended Noise Monitors and Weather Station Recorded Conditions ContinuouslyNoise Emissions of Mobile Equipment and Fixed Plant Facilities TestedFuture Sound Levels PredictedExposures Compared to Federal, State, or Local Environmental LimitsMitigation EvaluatedBerms, Equipment Enclosures, and Operational ModificationsHearing Testimony Provided Describing Methods and Findings, and Addressing Regulator and Community Concernsc