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r RgUiVLU NOV 8 1989 ENVIRONMENTAL HEALTH APPENDIX A: SUPPLEMENTAL INFORMATION PERMIT/ RV CES Tank System Description The tank system to be closed is located at Bldg. 801. The building houses an accelerator that is part of the Flash X-Ray Radiography Facility. The system receives floor washdown water resulting from maintenance work on, and leakage from, the accelerator. The tank system consists of a 4,000-gallon fiberglass tank and associated underground piping which drains several areas within the building. Three additional underground components are also present: a vent line for the tank, a vertical riser connected to the top of the tank, and overflow piping (Figure 1) . An 8,000-gallon tank containing low conductivity water is within approximately 4 feet of the subject tank. A variety of electrical lines and piping crisscross above the top of the tank, and are currently exposed. The system was installed in 1980 and was registered with the State Water Resources Control Board in June 1984 as 801-31R. LLNL has subsequently renamed the system 801-R2U1. San Joaquin County refers to the tank as Tank #2. Figure 2 shows the location of the Bldg. 801 tank system at Site 300. Historical Summary On May 24, 1989, Gary Peters Enterprises of Rancho Cordova, California performed a Precision Test on the 801-R2U1 tank system. The Precision Test showed no loss when the liquid elevation was 1/4 inch above the top of the tank, but showed a 2 gph liquid loss rate at 4 inches above the top of the tank. The tank was pumped out on May 24. A sample of the wastewater showed 2,500 ppm oil and 1.5 ppm Freon. To define the leak site, a helium injection/detection test was performed and results of this test indicated there could be more than one leak. Excavation to the top of the tank revealed a leak site consistent with indications resulting from the Precision and helium injection/detection tests. Repair activities occurred during early July and a Precision Test on July 14 confirmed that the leak had been repaired and that no other leaks were present. As part of the investigation soil samples from undisturbed geologic material were collected. Samples from the east end of the tank were analyzed using (1) EPA Methods 8010, 8020, 3550 and (2) California Assessment Manual Waste Extraction Test (CAM WET) for copper and nickel. No detectable concentrations were found for any of the potential contaminants. While soil samples were being collected at the west end of the tank, the tank was inadvertantly punctured with an auger attachment to a backhoe. Approximately 2,000 gallons of water, remaining in the tank from the July 14 Precision Test, escaped into the surrounding gravel fill. A grab sample taken of the wastewater remaining in the tank after the July 17 puncture showed 0.4 ppm Freon and 57 ppm Total Petroleum Hydrocarbons (TPH) .