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Chapter 5 MINING WASTES <br /> Because mining wastes are usually not discharged together with other wastes and because <br /> the location of disposal often must be close to the area being mined, Subchapter 15 uses <br /> different terns to classify these wastes. However,because of similar properties and class <br /> definitions, they can be compared to the classifications of other wastes as follows: <br /> Mining-Waste <br /> Group A _ 'hazardous' <br /> Group B = 'designated' <br /> Group C = 'inert' <br /> Mining wastes are to be discharged to mining waste management units classified as Class <br /> A, Class B,and Class C, respectively <br /> The hazardous waste management regulations of Title 22 of CAC determine the boundary <br /> between Group A and Group B mining wastes. The Designated Level Methodology may <br /> be used to define the boundary between Group B and Group C mining wastes. For <br /> determining whether a mining waste is Group B or Group C, deionized water (in some <br /> cases,adjusted to the pH of local rainfall)may be substituted for the citrate buffer in the <br />„ WET only where mining wastes have been shown not to be capable of generating acidic <br /> leachate and where the disposal environment will be neutral or basic, pH z 7.0 (see <br /> "Determining Extractable Concentrations" and "Acid-Base Account" in Section 3.12 above). <br /> i <br /> J <br /> Page 42 Designated Level Methodology <br />