Shell Engineering & Associates, Inc.

Meteorological Monitoring Alert – Psd Permitting

AERMOD has replaced ISC in most cases as the preferred air dispersion model for use in PSD/regulatory permitting. AERMOD uses current science to predict the impact of air emissions from multiple sources at receptors located near points of interest.

The AERMOD has the ability to use site-specific meteorological parameters to account for variation in wind and stability due to nearby structures, terrain, and land characteristics. For example, the wind patterns next to a significant water-body will vary from the wind patterns at inland locations.

EPA and state agencies have recently began requesting dispersion modeling based on site-specific meteorological data to improve the accuracy of the modeled predictions. Since meteorological data is usually collected in one-year blocks, this may cause delays in the permitting process. To minimize any delays, the decision to use onsite data should be made and if necessary initiated as soon as possible.

Shell Engineering and Associates, Inc. has the capability of providing for all of your ambient monitoring needs, including the monitoring of site-specific meteorological parameters. Typical services include developing the monitoring strategy, air monitoring siting studies, preparation of quality assurance and standard operating procedure manuals, liaison with regulatory officials, acquisition and installation of equipment, servicing and troubleshooting equipment problems, performing calibrations and audits, and the reporting of data.

Additionally, Shell Engineering and Associates, Inc. has extensive background in air dispersion modeling including the ISC model, the AERMOD model and the CALPUFF model.

Shell Engineering has provided both air dispersion modeling and ambient air monitoring since the 1970’s.

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