|
|
 |
|
|
|
SHA offers a variety of air quality services to assist clients in demonstrating and maintaining compliance with local, state, and federal regulations. We provide a full range of air-related services including:
- New Source and Source Modification Permit Applications
- Title V Operating Permit Applications
- Stationary and Mobile Source Air Emissions Modeling
- Screening Level and Refined Air Dispersion Modeling
- Pollutant Source Air Emissions Estimates
- Air Emissions Inventories
- Air Emissions Monitoring
- Visible Emissions Testing by Reference Method 9
- Landfill Gas Collection System Operation and Maintenance
- Landfill Gas Collection and Control Monitoring and Reporting
- Landfill Gas Collection and Control System Optimization
- Landfill Gas Migration Evaluation
- NSPS and NESHAP Compliance Assistance
- Landfill Gas-to-Energy Air Permitting
- Odor Control
- Soil Vapor Studies
SHA maintains staff committed to the air quality / air pollution control service area. SHA has a proven track record of helping clients understand air quality regulations, secure construction and operating permits, and maintain compliance with monitoring, record-keeping, and reporting requirements. We provide air permitting, modeling, and monitoring services to a wide range of industries and clients. Our engineers and scientists prepare air emissions estimates through calculations based on published or manufacturers' emission factors and/or on-site sampling. We work with our clients to assist in maintaining NSPS/NESHAP-compliant facilities, compliance with Title V or NSR permits, and compliance with air quality standards and PSD increments.
|
Landfills/LFGTE Facilities: Title V Air Pollution Control Permitting and Air Dispersion Modeling
New England and New York
|
 SHA has prepared Title V operating permit applications for municipal solid waste landfills and landfill gas-to-energy (LFGTE) facilities across New England. SHA keeps its clients advised of applicable regulations and coordinates permitting and reporting efforts. Landfill air emissions estimates in the air permit applications for these facilities include criteria pollutant emissions from landfill flares, LFGTE engines, and heavy equipment, and hazardous air pollutant emissions that escape fugitively from landfills. Our expertise includes measuring or estimating the quantities of the components of landfill gas, estimating collection system capture efficiency and combustion destruction efficiency, and combining landfill gas control with energy recovery.
Our air pollution control permit applications also include air dispersion modeling reports when necessitated by state or federal regulations. We have the capability to perform both screening level and refined air dispersion models that consider the local and regional terrain features surrounding the source, meteorological conditions, pollutant emission rates, building downwash, and source parameters to assess compliance with National Ambient Air Quality Standards (NAAQS) and Prevention of Significant Deterioration (PSD) increments. SHA maintains good working relationships with many state environmental agencies which, in turn, typically facilitate prompt regulatory review and permit approvals.
|
|
NSPS/NESHAP Compliance Monitoring and Reporting & Landfill Gas Migration Control
New England and New York
|
 SHA assists landfill operators to demonstrate and maintain compliance with local, state, and federal air regulations. SHA advises and assists our clients in maintaining New Source Performance Standards (NSPS) / National Emissions Standards for Hazardous Air Pollutants (NESHAP) compliant landfill gas collection systems. We perform wellfield monitoring and balancing to optimize the gas collection system, landfill gas probe monitoring, quarterly surface emissions scanning, and gas sample collection. SHA keeps its clients advised of applicable regulations and coordinates permitting and reporting efforts.
SHA provides services for a landfill that is a Superfund site and also the source of gas migrating beneath an adjacent trailer park. Gas migration from the unlined landfill to the residential park has been documented since the late 1990s. A gas extraction system collects landfill gas to minimize migration. Probes are used to monitor gas migration.
Through SHA's efforts, landfill gas migration has been effectively controlled during the past five years through minor modifications to the infrastructure of the gas extraction system and proper balancing of the wellfield. Gas extraction rates from individual wells in the landfill are continually adjusted based on an evaluation of the energy extraction rate at each extraction point. Based on an evaluation of the daily soil gas probe monitoring data and recorded barometric pressures, SHA has implemented a U.S. Environmental Protection Agency-approved barometric pressure-based soil gas probe monitoring program.
Since 2005, when the barometric pressure-based monitoring program was initiated, the gas probe monitoring frequency has been reduced by nearly 75 percent relative to daily monitoring, and minimal gas migration has been observed. The measures employed at this landfill have limited the potential for adverse health and safety impacts to the residents of the trailer park and, at the same time, reduced the monitoring costs for the landfill.
In addition, SHA assists the landfill operators to maintain and demonstrate compliance with local, state, and federal air regulations. SHA advises and assists our clients in maintaining NSPS/NESHAP-compliant landfill gas collection systems. We perform wellfield monitoring and balancing to optimize the gas collection system, landfill gas probe monitoring, quarterly surface emissions scanning, gas sample collection, and report preparation.
|
|
Aggregate Crushing Facility: Air Permitting, Compliance, and Air Emissions Estimates
Vermont
|
 SHA provides air-related services to facilities that operate both portable and stationary aggregate crushing equipment. SHA provides air emissions estimates for such facilities in support of air permit applications to document criteria pollutant emissions due to the presence of heavy equipment engines, primary and secondary crushing, screening, and conveying units. SHA also provides assistance in determining which state and federal regulations are applicable to each facility. Our personnel are trained in providing Visible Emissions Testing according to the U.S. Environmental Protection Agency's Reference Method 9.
|
|
Wood Chip Gasifier: Air Permitting and Air Dispersion Modeling
Vermont
|
SHA was retained to prepare an operating permit modification and construction permit application for a project that included the addition of a wood chip gasifier to an existing public facility. The gasifier is used by our client to provide steam to heat a large public building via gasification of wood chips.
SHA successfully modeled the air emissions from the gasifier in addition to other pollutant sources at the site. SHA considered the nearby terrain, meteorological conditions, and building downwash in order to model the pollutant emissions. We then compared the pollutant concentrations predicted by the refined air dispersion model to National Ambient Air Quality Standards (NAAQS) and Prevention of Significant Deterioration (PDS) increments. Based on the proposed location of the stack in relation to the building, SHA was able to advise the client on construction of a stack sufficient in height to adequately maintain ambient air impacts below the NAAQS and PSD increments. As a result of SHA's refined air dispersion modeling, the client was able to qualify for a modification to their operating permit and the gasifier was constructed.
|
|
|
|
|
|
