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Dust Collector- Roll - Off CHARACTERIZATION TITLE 22 CAM 17 Substance Units Sample Date TTLC STLC 7/9/2019 mglkg mg/kgmg/1 Antimony and /or antimony compounds mg / kg 0 . 94 500 15 Arsenic and /or arsenic compounds mg /kg 4 . 2 500 5 Barium and /or barium compounds mg /kg 77 10000 100 Beryllium and /or beryllium compounds mg /kg 0 . 58 75 0 . 75 Cadmium and /or cadmium compounds mg /kg 0 . 33 100 1 Chromium and /or chromium III compounds mg /kg 86 21500 5 Cobalt and /or cobalt compounds mg/kg 6 . 2 8 , 000 80 Copper and /or copper compounds ma/ka ma/k57 21500 25 Lead and /or lead compounds mg/ka mg/k17 13000 5 Mercury and /or mercury compounds mg /kg ND 20 0 . 2 Molybdenum and /or molybdenum compounds mg /kg 15 3500 350 Nickel and /or nickel compounds mg /kg 72 23000 20 Selenium and /or selenium compounds mg /kg ND 100 1 Silver and /or silver compounds mg /kg ND 500 5 Thallium and /or thallium compounds m /k ND 700 7 Vanadium and /or vanadium compounds I mg/kg 18 21400 24 Zinc and /or zinc compounds mg/kg 87 53000 250 Background : The Dust Collector Roll -off is a sealed container that contains material captured by the " Main " Dust Collector- It is equipped with an alarm that sounds when the container is full . Findings : None of the compositional concentrations exceed the total threshold limit concentrations (TTLC ) in Section 66261 . 24 of California Code of Regulations Title 22 ( CCR Tile 22 ) . Based on compositional concentrations none of the constituants are likely to exceed the soluble threshold limit concentrations ( STLC ) in CCR Title 22 . Conclusion Based on the compositional concentration of metals regulated by CCR Title 22 , the dust collector material is non - hazardous .