Closures were completed on over 70 produced water holding tanks covering a large area in a remote part of northwestern Colorado. The replacement of the existing culvert pit holding tanks was coordinated with the oil and gas operator to install above-ground tanks with minimal downtime. The tanks and impacted soils above state cleanup levels were removed where practical under a group COGCC Form 27. Clearance samples were collected from the excavation and impacted soil placed in a landfarm on each pad. Landfarm soils were amended with nutrients and moisture, and mixed periodically. After remediation, landfarm soils were used to fill the excavation and COGCC Form 4’s were submitted for closure that included data collected from each pad.