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Attachment B, Technical Revision to the May Day Mine Permit, September 12, 2009. 34 of 35 <br /> <br />T-kName.• lkl- Sodium Silicate Solution <br />DatePrWWea 06/09/06 <br />Page: 4 of 5 <br /> the same dosage did not develop any treattaenRrelated effects. Decreased <br /> numbers of births and survival to weaning was reported for tats fed <br /> <br />Special &uifi sodium silicate in their drinking water at 600 and 1200 ppm. <br />Sodium si8cate was not mutagenk to the bacterium E. Cob when tested <br /> is a mutageuicity bioassay. There are no known reports of <br /> carcinogenicity of sodium silicates. Frequent ptgesdon over extended <br /> periods of time of gram quantities of silkates is associated with the <br /> formation kidney stones and other sill *ons urinary calcug in humans. <br /> Sodium silicate is not listed by IARC, NTP or OSHA as a carcinogen. <br />12. ECOLOGICAL INFO RMATION <br />Eco toxicity: The following data is reported for sodium silicates on a 186% solids basis: <br /> A 96 hour median tolerance for fish (Gambusis aifnis) of 2320 ppm; a % <br /> <br />i boar median tolerance for aster J1eas (Daphnia magna) of 247 96 <br />Ppm; a <br /> hour median tolerance for snail eW (Lymnea) of 632 ppm; and a 96 <br /> hour median tolerance for Amphipods of 160 ppm. This product <br /> contains approximately 44% sodium silicate. <br />Environmental Fate. This material is not persistent in aquatic systems, but its bfgh pH when <br /> undiluted or unneutralized is acutely harmful to aquatic life. Dilated <br /> material rapidly depolymerizes to yield dissolved silica in a form that is <br /> indistinguishable Gum natural dissolved silica. It does not contribute to <br /> BOD. This material does not bioaccum bite except in species that use <br /> silica as a structural material such as diatoms and siliceous sponges. <br /> Wbere abnormally low natural silica concentratbus exist (k= than 0.1 <br /> ppm), dissolved silica may be a biting nutrknt for diatoms and a few <br /> other aquatic algal species. However, the addition of excess dissolved <br /> sffka over the fimiting eoncenarsdon wig not stimulate the growth of <br /> diatom populations; their growth rate is independent ofsilka <br /> concentration once the limiting concentration is exceeded. Neither sfllca <br /> nor sodium will appreciably Wconcentrete up the food chain. <br />PbystcaUC'lremrml.• Sinks and mixes with water. Only water will evaporate from this <br /> material. <br />13. DISPOSAL CONS>pERATIONS <br />C%uiijkadon: Waste material is a RCRA Hazardous waste because it exhibits the <br />corrosive characteristic (pH greater than or equal tol2.5) as defined in <br />EPA rules at 40 C.F.R. §26122 (a)(l). <br />Disposal Method: Dispose in accordance with federal, state and local regulations. <br />34. TRANSPORT INFORMATION <br />DOT UNStotus: This material is not regulated hazardous material for transportation.