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-- -- — sau tilL1G�LLL1 Removal Input Materials: Experimental Debris with RCRA Lead equipment from Experimental Equip, repair/upgrade or p q p Oft=site removal containing Repair/Upgrade and disposal RCRA lead Removal (CWC Ig 1) FIGURE IIi.4.2. EXPERIlvIENTAL EQUIPMENT REPAIItS/UPGRADBS AND REMO GENERATION PROCESS VALS WASTE Hazardous .Waste and Process Description Equipment that uses lead shielding in various forms was dismantled, resulting in lead contaminated debris. While this waste stream may appear to be routine for SLAC, much of it constitutes legacy waste in the form of shielding that was in place over a period of several years and is now removed because of discontinuation of certain experiments. The lead is not readily recyclable because it was used in a radiologically controlled area and is not readily ,recyclable under DOE requirements. ead is essential to many experiments at SLAC to ensure that workers, the public and the environment are not exposed to unsafe levels of radiation. SLAC is committed to ALARA, i.e., seeing that radiation exposure is As Low As Reasonably Achievable. Shielding is an important part of ALARA and lead is an essential shielding material in spite of its health hazards. Much of the lead waste generated at SLAC is from cleanup of old experimental areas that are being reused or demolished. Lead contamination occurs from the oxidation oflead shielding. Where feasible, SLAC tries to coat new lead shielding installations when there is no increased radiological hazards resulting from the coating. Over the long term, this waste stream will continue to exist, but it is expected that the quantities of waste generated will decrease over time, due to continuous improvements in reducing environmental impacts from this material, e.g., better storage and containment procedures and coatings where feasible, 1 SOURCE REDUCTION/l'OLLUTIONPREUENTION EVALUATION September 1, 2015 SB14 Plan �_9