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Water Quality Site Assessment Method <br /> For each constituent: [U) D �� <br /> 0 = Site ground water concentrations (gg/1) <br /> 0 = Background'ground water concentrations (gg/1) <br /> =Numerical water quality limits protective of beneficial uses <br /> ® = The higher of 0 and 3 for each constituent` <br /> = Contaminated soil WET extract concentrations (gg/l extract) <br /> © =Contaminated soil potential leachate concentrations (gg/1) _ x 10' <br /> = Background'soil WET extract concentrations (gg/l extract) <br /> ® = Attenuation"that would be required to protect background water quality = © + <br /> 0 = Attenuation"that would be required to protect beneficial uses = © _ <br /> Perform the following comparisons in order. <br /> Ground Water: <br /> If O <_O, then no water quality impact has yet occurred. <br /> If < < ®, then water quality has been impacted (degradation has occurred)but <br /> beneficial uses have not yet been affected. <br /> If >_ ®, then beneficial uses have been affected (pollution has occurred). <br /> Soils: <br /> If © <_�, then contaminated soils pose no threat to water quality; STOP. <br /> If(5) <_0, then contaminated soils pose no threat to water quality; STOP. <br /> If > 0, then calculate ® above. Is this degree of attenuation" available at <br /> the site? If not, contaminated soils threaten ground water quality <br /> (threat of degradation). <br /> If© <_®, then contaminated soils pose no threat to beneficial uses; STOP. <br /> If© > ®, then calculate S above. Is this degree of attenuation" available at the <br /> site? If not,contaminated soils threaten beneficial uses of ground water <br /> (threat of pollution). <br /> ' Background=out of the influence of waste management activities(per Chapter 15,Article 5). <br /> Regional Board does not expect discharger to improve on background conditions(see Resolution 92-49). <br /> b Dilution caused by the WET(50 grams soil in 500 milliliters of extract solution). <br /> " Within clean soil between the base of contaminated soil and the highest elevation of ground water. <br /> J% 10/2/92 <br />