This is a notice of intent to award a sole-source contract and is not a request for proposals. However, the Government shall consider all responses from responsible sources. Naval Health Research Center (NHRC), San Diego, CA, intends to enter into a contract with REES SCIENTIFIC CORP, CAGE 04DK0, Ewing, NJ. The statutory authority for this procurement is 10 U.S.C. 3204(a)(1), only one responsible source. Item/Service Description Parts, labor, and onsite service for annual preventative maintenance of a REES Environmental Monitoring System using manufacturer recommended PM documentation. Delivery Schedule 12 Months plus four 12-Month Option Periods All contractors must be registered in the System for Award Management (SAM.gov) and have fully completed FAR and DFARS representations and certifications. Reference N6311626Q0531 on submissions and include Company Name, Full Address, CAGE Code and Point of Contact information including Name, Phone Number and E-Mail address.