COMPLIANCE INFO_FILE 3 - Laserfiche WebLink

Home Browse Search

Introduction This report documents the closure activities for the 874-DlUl Underground Diesel-Fuel P g System at Lawrence Livermore National Laboratory's (LLNL) Site 300 facility. Figure 1 depicts its former location. This underground storage tank (UST) was formerly designated by LLNL as 874-11D and was registered with the California State Water Resources Control Board (SWRCB) using the Hazardous Substance Storage Statement shown in Appendix A. This closure report provides the necessary documentation to verify that the tank was closed in accordance with Title 23 CCR 2672 (a), (b), and (d). Regulatory Requirements Closure activities for the system were permitted under the closure plan Application for Permit to Close Underground Storage Tank Storing Hazardous Materials. It was approved by the San Joaquin County Public Health Services—Environmental Health Division (SJCPHS– EHD) as Project #39-1945-15 on October 18, 1989 (typically valid for 90 days). To comply, LLNL planned to remove the tank during the 90-day period, but removal plans were delayed until a soil-boring permit was issued. On February 27, 1990, the SJCPHS–EHD issued soil- boring Permit #90-430 and verbally approved the rescheduling of the tank removal. To document this, LLNL sent letters to the agency on March 15, and June 25, 1990. On June 27, 1990, the UST was removed under the observation of SJCPHS–EHD's representative, Mr. William Snavely. Tank closure activities were performed in accordance with a National Environmental Policy Act (NEPA) Categorical Exclusion report that was approved by the Department of Energy—San Francisco Operations Office. Tank Cbronology The 874-DlU1 Underground Diesel-Fuel System was installed in 1957 to provide diesel fuel oil for a boiler and a standby emergency generator in Building 874. The tank was constructed of carbon steel and had a capacity of 5000 gal. The tank system was taken out of service in 1984 when the boiler and generator were removed. At this time, the supply and return lines (piping) were disconnected from the building and capped, but were left in place and connected to the tank. In August 1985, McKesson Environmental Engineers performed a Horner EZY-CHECK precision test. For this test, the tank was filled with diesel fuel; at the conclusion of the test, the diesel fuel was pumped out. The tank tested tight at+0.005 gal/hr, but a leak was detected in the upper portion of the piping system. In early 1988, an unrelated trenching operation hooked and severed a length of pipe which was still connected to the tank. No diesel fuel was released because the tank and piping were empty and not in use. The damaged pipe was removed and the remaining short length of pipe that was still connected to the tank was capped. In August 1988, Gary Peters Enterprises performed a helium/injection test to identify the location of the leak that been identified in August of 1985. The precise location of the piping leak was not identified, but another small leak was identified at the capped end of the pipe that had been severed by the 1988 trenching. 1