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

A -- MIDATLANTIC INTEGRATED ASSESSMENT ANALYTICAL SERVICES SOL PR-NC-98-10083 DUE 121097 POC Sya Mayes (919) 541 3416 WEB: mayes.sya, http://www.epa.gov/oam/rtp_cmd. E-MAIL: Click here to contact the contract specialist via e-mail, mayes.sya@epamail.epa.gov. This amends Submission No. 145702, a combined synopsis/solicitation issued 11/25/97. Note: PROPOSAL DUE DATE HAS NOT CHANGED. This is to provide answers to technical questions submitted in response to the RFP: Q1.) Does grain size analysis mean only the percent silt-clay determination or does it include a particle size distribution analysis on the %silt-clay? Answer: Percent silt/clay content, not a full distribution analysis. Q2.) Grain-size analysis requires 400 analyses be completed 60 days after contract award, and then 1200, 150 days after award. Is the 150 days correct? Answer: Yes. Delivery of all remaining samples is required within 150 days after contract award. Q3.) Will EPA package the samples for shipping or does the contractor need to send someone to package them? Answer: The samples are packaged for shipment, however, the contractor will be required to send someone to the Narragansett facility to physically ship them. The Narragansett facility will be closed for federal holidays on December 25 and 26. Q4.) What trace elements are required for the SEM/AVS analyses? Answer: Common SEM metals include copper, cadmium, zinc, nickel, and lead. Please provide 3 copies of your proposal. All other information remains unchanged. (0338)

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