The U.S. Geological Survey intends to award a non-competitive, firm-fixed-price purchase order to Attagene, Inc. for multi-endpoint gene regulatory assays to evaluate cellular responses to organic chemicals in groundwater samples from petroleum hydrocarbon contaminant plumes. The contract includes one base year and four option years, with approximately 10 samples analyzed annually. Attagene is cited as the only reasonably available source because of its unique assay suite, high-throughput quality control data, and publicly accessible chemical response data. This notice is for informational purposes only and is not a request for competitive proposals, though responsible sources may submit a capability response. Interested parties must be registered in SAM; the applicable NAICS code is 541990 with a $19.5 million size standard.