During the Tuolumne City sewer line replacement project, a historic underground storage tank (UST) was discovered. The 250-gallon steel UST was impeding construction and needed to be removed for the project to continue. Condor expedited the permitting process with the County and coordinated the removal with licensed contractors. Based on historic document review, the UST was used for gasoline fueling in front of the Tompkins Garage in the early 20th century and had been left in place in the Chestnut Street right-of-way. The UST and piping were found to be empty and were triple-rinsed prior to removal. Stained soil was identified but was found to contain very low concentrations of hydrocarbons in laboratory analyses. Condor worked with the County to quickly obtain concurrence from the California EPA to re-use the soil as trench backfill so the project could resume.
