ARCHIVED REPORTS_XR0008213 - Laserfiche WebLink

Home Browse Search

"The organic substances.. are generally artificial. Their occurrence in nature is negligible. None are essential nutrients to humans or animals. Accordingly,humans and animals have developed few natural defenses to these substances. Most are much more . bioaccumulative and more toxic than the inorganic substances..."3 The "persistent and bioaccumulative toxic substances" for which TTLCs were derived fall into several chemical classes, including heavy metals (e.g., arsenic and mercury), organometallics (lead compounds,organic) base/neutral extractable compounds (e.g., chlordane,lindane and toxaphene), acid extractable compounds (pentachlorophenol), phenoxy acids (2,4,5-trichlorophenoxyacetic acid)„ and volatile organic compounds (trichloroethylene). Most of the waste constituents that have the potential to degrade water quality(and will, therefore,be considered in the classification of wastes) fall into one or more of these chemical classes. For this reason,it is recommended that the "generic" 10- fold leachability factor for organics and 100-fold leachability factor for inorganics be used in situations where information on the leachable constituent fraction is unavailable. 3 c The Total Designated Level for a constituent of a solid waste may be calculated by multiplying the Soluble Designated Level by the leachability factor. However,since the Total Designated Level is to be expressed in units of milligrams of constituent per kilogram of waste(mg/kg), the Soluble Designated Level from which it is calculated must also be expressed in these units. Due to the 10-fold dilution in the WET, Soluble Designated Level Soluble Designated Level for a Constituent of a Solid = for a Constituent of a Solid x 10 16] Waste (mg/kg of waste) Waste (mg/l of WET extract) The Total Designated Level for a constituent of a solid waste is, therefore, calculated as follows: _ _-- --� - - --_ -_-Total Designated-LevelT Soluble Designated LevelT --for-a Constituent-- -= --- -for a Constituent ------x Leachability -x- 10- 171 of a Solid Waste of a Solid Waste Factor (mg/kg of waste) (mg/i of WET extract) By combining equations [4] and [7], the Total Designated Level for a constituent of a solid waste may be expressed in terms of the water quality goal — - -- - ---Total-Designated Level - —Water - - Environmental - - - --- - -- ---- --for a Constituent = Quality x Attenuation x Leachability 18] of a Solid Waste Goal Factor Factor (mg/kg of waste) (mg/1) f A solid waste with total constituent concentrations greater than their Total Designated t Levels would be classified as 'designated wastes' and would be required to have Class eq II containment at the site of waste discharge. 01 Designated Level Methodology Page 39