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LLNL-AR-788093 <br /> External <br /> 4. CWC 135: Unspecified Aqueous Solution <br /> Site 2018 quantity (lb) <br /> LLNL 11,408 <br /> 4.1 CWC 135—B391 HF Etching Solution <br /> Site 2018 quantity(lb) <br /> LLNL 10,717 <br /> Optics Unspecified <br /> processing aqueous Off-site <br /> operations, solutions disposal <br /> including (CWC 135) <br /> etchant solution <br /> FIGURE III.4.1: NIF OPTIC PROCESSING FLOW DIAGRAM <br /> This waste stream is generated from NIF optics processing operations. These processes have <br /> been optimized to generate the minimal amount of waste while producing the high quality <br /> optics required. For example, optics are batched to minimize solution change out between <br /> types, and baths are reused before spent etchant must be discarded and replaced. <br /> In 2009, NIF started implementation of an optics repair process to extend the life of the <br /> optics. This operation has continued to expand and reduces both the need to acquire new <br /> replacement optics and the chemicals used to process them. <br /> SOURCE REDUCTION/POLLUTION PREVENTION EVALUATION <br /> Description of Measure: <br /> LLNL plans to continue existing best management practices to minimize this waste <br /> stream. No other source reduction measures are planned at this time. <br /> September 1, 2019 SB14 Plan III-7 <br /> ESH-EFA-P2S-19-16592 <br />