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• i lLawrence Livermore National Laboratory April 16, 1987 ENVIROMENTAL HEALTH Dr. Jogi Khanna FERMIT/SERVICES, San Joaquin Local Health District 1601 East Hazelton Avenue P.O. Box 2009 Stockton, CA 95201 SUBJECT: Site 300 - Calderon Testing of Inactive Landfills Dear Dr. Khanna: Pursuant to your letter dated February 20, 1987, we have enclosed "Screening Questionnaires" for inactive solid waste disposal sites at Lawrence Livermore National Laboratory - Site 300, based on information in our files. A general location map (Figure 1 ) and a disposal site location map (Figure 2) are enclosed. The inactive sites are commonly designated as Pits 2, 3, 4, 5, 6, 8 and 9. There are also two active sites, designated Pits 1 and 7, which have been included with this submittal to clarify the status of all sites. Site 300 is a high-explosives test facility and the disposal sites received firing table debris consisting of construction debris and gravel that may have been contaminated with depleted uranium, beryllium, and lesser quantities of thorium. Also, Pits 3, 4, and 5 received some tritium contaminated components prior to 1978. Recent analyses also show lead and barium in the landfilled gravel. Pit 6 received animal wastes and carcasses, and assorted scrap metal and waste chemicals. These solid waste disposal sites are regulated by the California Regional Water Quality Control Board - Central Valley Region, and a copy of their Order No. 80-184 is enclosed. Active landfills are also regulated by the Department of Health Services by Interim Status Document CA2890090002. Because of the remoteness of the disposal sites and the characteristic "demolition" - type wastes, it is anticipated that there are no significant impacts from any of the sites via the air pathway. Radionuclides have not been detected above the ground, although tritium has been detected in the groundwater in the Pit 3 and 5 area. There are on-going studies of the groundwater impacts, which are reported to the Regional Board. As part of the groundwater investigation, borehole gases have been analyzed for radionuclides at Pits #3 and #5, and tritium was detected at extremely low concentrations. The purpose of the borehole gas analysis was to attempt to locate areas of subsurface tritium concentrations. An Equal Opportunity Employer-University of California-PQ Box 808 Livenwe,California 94550-Telephone(415)422-1100*Twx 910-386-8339 UCLLL LVMR