This means that you'll be able to search for NAICS codes directly (if that's your jam). We'll do the math; let's make better data on public procurement together.
Possible NAICS Codes
562910 – Remediation Services
541715 – Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)
541620 – Environmental Consulting Services
541380 – Testing Laboratories
333999 – All Other Miscellaneous General Purpose Machinery Manufacturing
221310 – Water Supply and Irrigation Systems