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CALCULATING DESIGNATED LEVELS <br /> Water Quality Standards Obtain information on the Obtain information on the <br /> from the applicable site of waste discharge. waste to be discharged. <br /> Water Quality Control Plans <br /> What bodies of water may <br /> be or have been affected ? <br /> What factors may influence <br /> What are the beneficial uses the attenuation of waste <br /> afthose bodies of water? constituents as they <br /> mi rate to water? <br /> What are the water quality objectives <br /> to protect those beneficial use ? <br /> What numerical water quality limits Estimate the magnitude <br /> will implement all applicable of the attenuation of <br /> water quality objectives ? constituents between <br /> waste and water at the site. <br /> Choose the most limiting <br /> of those water quality limits. <br /> Water Quality Goal Attenuation Factor <br /> SOLUBLE DESIGNATED LEVEL <br /> Is there a consistent ratio <br /> of total to leachable waste Leachability Factor <br /> constituent concentrations 7 <br /> TOTAL DESIGNATED LEVEL <br /> Figure 5 <br /> are multiplied by factors which account for the magni- li Environmental Attenuation Factors <br /> tude of environmental attenuation expected to occur <br /> under reasonable worst-case conditions at the pro- There are a variety of natural processes which act to <br /> posed site of discharge. The result is a set of Soluble attenuate(reduce the concentrations of)waste constitu- <br /> Designated Levels for waste constituents of concern ents as they migrate through the environment. These <br /> which are specifically applicable to both the waste and processes,which are collectively grouped under the <br /> the site and which,if not exceeded,should protect the term"environmental fate",include sorption,chemical <br /> beneficial uses of waters of the state. binding,ion exchange,filtration,diffusion,dispersion, <br /> dilution,chemical reaction,biodegradation,and <br /> For the site in question,wastes having soluble constitu- i partitioning. By collecting data on the waste constitu- <br /> ent concentrations in excess of their calculated Desig- ents and on the site in question, the amount or degree <br /> nated Levels are assumed to pose a threat to water of attenuation which would be expected to occur as the <br /> quality and are classified as"designated wastes". I constituents migrate from the location of waste dis- <br /> These wastes are required to be discharged to waste j charge to either ground or surface water may be <br /> management units which isolate them from the envi- estimated. In The Designated Level Methodology,the <br /> ronment. smallest degree of attenuation that would be expected <br /> /on B.Marshack,D.Env. <br /> Page 11 <br />