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Forward, Inc. -3- 23 April 1982 <br /> 2. The number of metals exceeding the CAM hazardous level shall not <br /> exceed three. <br /> [Wastes containing metals usually contain more than one metallic <br /> contaminant , in contrast with pesticide wastes which usually <br /> contain only one pesticide. 'Metals often have similar toxicologic <br /> effects with additive or interactive toxicities . Similar solubil - <br /> ities and chemical properties often cause ailetals to move together <br /> in the environment. For these reasons, it is important to limit <br /> the number of hazardous mietals in a waste material . The number <br /> three was chosen somewhat arbitrarily. For the purpose of these <br /> specifications, arsenic is considered to be a metal .] <br /> 3. Metal concentrations shall not exceed four times the CAM hazardous <br /> level . <br /> [Since ,metals are elements , environment-al degradation is not <br /> possible. Because they are long-lived, the "borderline" concen- <br /> trations for hazardous i-02tals is set lower than that set for <br /> organic compounds.] <br /> 4. Organic lead concentrations shall not exceed the CAM hazardous <br /> level . <br /> [The concentration difference between the CAM hazardous and <br /> extremely hazardous levels for organic lead is too narrow to allow <br /> the definition of a "borderline" hazardous level . Above the CAM <br /> hazardous level , wastes containing organic lead should be disposed <br /> of in a Class 1 site.] <br /> 5. Soluble fractions of the total metal concentrations shall not <br /> e.,-,ceed 10% based on a .418-hour water extraction test at pH5 . <br />