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

B -- DEVELOPMENT OF THE AIR POLLUTANT EXPOSURE MODEL (APEX) VERSION 2.0 SOL CC0328 POC James F. Kempf, Contract Specialist, (919) 541-4278 WEB: Click here to go to the web page where the RFQ will, http://www.epa.gov.oam/rtp_cmd. E-MAIL: Click here to contact the Contract Specialist via, kempf.james@epa.gov. EPA intends to award a sole source purchase order to ManTech Environmental Technology, Inc. pursuant to 41 U.S.C. 253(c)(1): Only one responsible source and no other supplies or services will satisfy agency requirements. The U.S. EPA's Office of Air Quality Planning and Standards (OAQPS), is developing an Air Pollutant EXposure model (APEX), that is one of the prototypes for the Total Risk Integrated Methodology (TRIM) system being developed by OAQPS in order to complete the residual risk evaluations required by sections 112(d)and 112(f) of the Clean Air Act of 1990 (CAA). ManTech has provided support to the EPA in the development of related exposure models HAPEM, and the UNIX version of pNEM/O3, the development of the CHAD data base and Version 1.0 of APEX. Through this support, ManTech has developed the necessary background knowledge and specific expertise necessary to efficiently conduct this effort in order to meet the required EPA schedule. The tasks encompass enhancement of model code produced under a prior contract to make it more flexible so that it can be used to perform exposure analyses for various criteria and hazardous pollutants. The revised model, APEX Version 2.0, shall at a minimum allow for 1) ambient concentration inputs to be accepted that are based on either monitored or modeled air quality data; 2) additional and/or other microenvironments; 3) additional and/or other population cohorts; 4) the option of relying on user-specific indoor/outdoor ratios instead of a mass balance model for indoor and in-vehicle microenvironments; and 5) the option of including user-specific pollutant concentration increments or distributions of increments for any of the microenvironments to represent additional indoor sources. Demonstration of the draft APEX prototype Version 2.0 must be conducted by 7/15/00. No Request for Quotation is available and this notice of intent is not a request for competitive quotations. All responsible sources may respond by submitting a written narrative statement of capability within 15 days of this notice to James F. Kempf at the above address for consideration by the Agency. Responses must include detailed technical information and other technical literature demonstrating the ability to meet these requirements. Responses shall also include itemized pricing that is sufficient to make a determination that competition is feasible. If no affirmative responses are received within 15 days of this notice, an order will be placed with ManTech Environmental Technology, Inc. See numbered Note(s): 22 and 26. Posted 03/28/00 (W-SN438652). (0088)

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