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13. CWC 791 - Liquids with pH<2 <br />Site 2006 Quantity (lb) 2010 quantity (lb) <br />LLNL 24,030 1491 <br />13.1 Ouartz sample preparation <br />In 2006, the majority (16,000 lbs) ofthis CWC 791 waste stream was attributed to quartz <br />sample preparation at the LLNL Center for Accelerator Mass Spectrometry. The LLNL <br />2007 SB14 plan discussed potential reduction ofthis waste stream through off-site <br />sample preparation and use of smaller samples. The majority of quartz sample <br />preparation is now performed off-site, reducing this waste stream to under 500 pounds <br />per year. <br />Note that the 2010 waste volume is below the SB 14 reporting threshold and so this waste <br />stream is not carried forward into the 2011 SB 14 Plan. <br />September 1, 2011 SB 14 Report <br />33 <br />14. CWC 792: Liquids With pH52 With Metals <br />Site 12006 Quantity (lb) 2010 quantity (lb) <br />LBNL <br />18,423 8,010 <br />14.1 Ultra High Vacuum Cleanine Facility <br />This waste stream is generated as a result of metal surface cleaning operations. Metal <br />parts are cleaned through a multi step process including the following: <br />• Ultrasonic aqueous degreasing, <br />• Washing with commercial industrial cleaners (such as 909, B.N., Blue Gold, and <br />Mirachem 500 cleaners), <br />• Surface cleaning with acidic solutions, and <br />• DI -water and tap water rinsing, <br />The waste stream consists of acidic wastes that contain particles and dissolved metals. <br />LBNL evaluated the possibilities of extending the useful life of the acidic solutions. The <br />evaluation concluded that extending the useful life of acidic solutions is not technically <br />feasible. The reduction in generation in 2010 is due to decreased operations. <br />September 1, 2011 SB 14 Report <br />34 <br />