The U.S. Geological Survey (USGS) intends to award a non-competitive purchase order to Picarro, Inc. for a G2201-I cavity ring-down spectrometer (CRDS) and associated accessories, which are essential for analyzing methane and CO2 concentrations as well as stable carbon isotope ratios. This equipment is critical for projects aimed at characterizing natural gas from petroleum systems and living ecosystems, highlighting its importance in environmental and geological studies. Interested vendors should note that this opportunity is not open for competitive quotations, and responses must be submitted via email to Dayna Parkin at dparkin@usgs.gov by April 17, 2025, at 12:00 PM Pacific Daylight Time, with the anticipated award date set for April 25, 2025. Vendors must also be registered at https://sam.gov/content/home to be eligible for the purchase order.