U. S. Environmental Protection Agency, Contracts Management Division (MD-33), Attention: CMB-A, Research Triangle Park, NC 27711

A -- SEM ANALYSES OF SELECTED PM SAMPLES AND CMB MODELING OF SELECTED NERL RESEARCH PM SITES SOL ECC113 POC David A. Donnelly Jr., Contract Specialist, (919)-541-7888 E-MAIL: Click here to contact the contract specialist via e-mail., donnelly.dave@epamail.epa.gov. The U.S. Environmental Protection Agency, has a requirement to determine the sources of ambient fine and coarse particles collected at selected time periods from NERL PM (Particulate Matter) research monitoring sites. Selected samples already analyzed by X-Ray Fluorescence (XRF) for trace metal content and by Ion Chromatography (IC) for chemical species present will be analyzed with this procurement by Scanning Electron Microscopic (SEM) for individual particle analysis to obtain their size, morphology and particle elemental content. This same analysis procedure will be preformed on source samples of suspected contributors to the total particulate burden at these PM monitoring sites. All of these data sets will be used in the US EPA chemical mass balance receptor model (CMB rev 8.0) to determine the specific source contributions to the total particulate burden at the selected NERL PM research monitoring sites. The contractor shall have demonstrated expertise in the following three areas with severalpublications in peer-reviewed scientific journals in these three critical areas: 1. Analysis of individual particles found on various filter media by both manual and computer-controlled Scanning Electron Microscopy (SEM) for their size distribution, morphology, and elemental content based on energy-dispersive x-ray analysis. 2. Use of advanced modeling procedures to determine the various source contributions to the particulate burden at a given site. This shall require the use of the most current EPA Chemical Mass Balance software Rev 7.0 and Rev 8.0, when available. 3. Use of local and regional meteorological data in combination with CMB to produce a hybrid receptor model for each selected PM research site and meteorological conditions. It is anticipated that the solicitation will be issued on or about 8/21/97. Offerors interested in receiving a copy of the solicitation must submit a written request to the contact point at the address above. Telephone and fax requests will not be honored. Only one copy shall be sent to a corporate entity, regardless of the number of requests from one or more different geographic locations. All responsible sources may submit a proposal which shall be considered by Agency. (0218)

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