This section summarizes the demonstration of an Infrared-based Non-Intrusive Liquid Level Detection Technology (NLLDT) at the 221-U Facility located within the Hanford site. This demonstration was conducted by Infrared, Inc. of Reno Nevada in conjunction with Bechtel Hanford Inc. (Environmental Restoration Contractor) and DOE Engineers. The Infrared Imaging System demonstrated by Infrared, Inc. provides an attractive alternative to the baseline technology which employs mechanical methods of opening vessels to detect liquid level. An Infrared Imaging Systems is able to exploit the variations in physical properties of tanks, vessels and piping systems and the enclosed liquid and air to produce clearly defined locations of liquids, if they exist. For decontamination and commissioning (D and D) projects, the use of the NLLDT System to detect liquids in vessels eliminates the need to physically open and inspect these vessels. Risks to workers associated with gaining access to these type objects and the possible exposure to radioactive or contaminated materials can nearly be eliminated. This demonstration was conducted with the goal of characterizing a number of target vessels located on the deck of the 221 U Facility. This technology is suitable for DOE nuclear facilities D and D sites or similar public or commercial sites that must be decontaminated.