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Reclamation Feasibility Report - Virginia Canyon <br />DMG Procedure <br />This extraction is a 2:1 by volume deionized water extraction process described above for waste <br />rock analysis. <br />Total Characteristic Leaching Procedure (Modified EPA Method 1311) (5) <br />The Toxicity Characteristic Leaching Procedure (TCLP) is the standard procedure used by the EPA to <br />classify solid materials as hazardous wastes. <br />The extraction solution was prepared by adding 5.7 ml of glacial acetic acid to 500 ml of water. 64.3 ml of <br />1 N NaOH was added to the solution that was then brought to a volume of 1 L. 40 ml of this extraction <br />solution were then added to 2 g of < 80-mesh sediment in a 125 ml bottle. The bottles were then agitated <br />end over end using a rotary tumbler for 24 hours. Samples were filtered with a 0.45 gm syringe filter, <br />acidified with nitric acid, and analyzed using ICP-AES <br />Modified Synthetic Precipitation Leaching Procedure (EPA Method 1312) (4) <br />The Synthetic Precipitation Leaching Procedure (SPLP), in its unmodified form, is used to by the <br />EPA to determine the mobility of metals in a solid if exposed to acid rain. <br />A solution of 60% H2SO4: 40% HN03 by weight was prepared. Distilled water was then brought to <br />a pH of 5.0 using the 60% H2SO4: 40% HN03 solution. 2 g of <80 mesh sediment was placed into <br />a 125 ml bottle and 40 ml of the extraction solution were added. The bottles were then agitated <br />end over end using a rotary tumbler for 18 hours. Samples were filtered with a 0.45 µm syringe <br />filter, acidified with nitric acid, and analyzed using ICP-AES. <br />- H909 Acid Potential Test (EPA Field and Lab Methods 3 2 11) (2) <br />The H2O2 Acid Producing Potential Test (APP) is procedure that can be used to predict if a mine <br />waste material will be an acid producer or a neutralizer. The APP releases sulfide materials and <br />the extraction fluid will indicate what metal sulfides can be found in a solid. <br />1;9 of < 80 mesh sediment was placed into a Teflon beaker, 12 ml of 30% H2O2 was added, and <br />heated to 40°C. The beaker was removed from heat and the reaction was allowed to go to <br />completion as shown when bubbling ceased. An additional 6 ml of 30% H2O2 was added to the <br />beaker and the reaction was once again allowed to go to completion. The beaker was then heated <br />to 90°C and was allowed to react until any unreacted H2O2 in the beaker was destroyed. Beakers <br />were not allowed to go to dryness. The sides of the beaker were washed down with 50 ml of <br />distilled water, and then were heated to boiling to drive off any dissolved C02. The beaker was <br />then cooled to room temperature and titrated with 0.0100 N NaOH that was free of C02 to a pH of <br />7.0 using a pH meter. The procedure was repeated to collect a sample for analysis on the ICP- <br />AES. <br />Amorphous Digestion (6) <br />An amorphous digestion was carried out in order to determine if iron and manganese oxides were <br />present in the sediments analyzed (6). Like the APP, this procedure tests for specific species <br />within a sediment. <br />An extraction solution was prepared containing 0.2 M (NH4)2C204, 0.2 M H2C204.2H2O, and 0.1 M <br />Ascorbic Acid. 80 ml of the extraction solution was then added to 2 g <80-mesh sediment in a <br />Teflon beaker. The beaker was heated to 900C for 30 minutes. Samples were filtered with a 0.45 <br />gm syringe filter, acidified with nitric acid, and analyzed using ICP-AES. <br />13