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Water Quality Site Assessment Method <br /> For each constituent: D D F=r <br /> T =Site ground water concentrations (µg/1) <br /> = Background'ground water concentrations (µg/1) <br /> =Numerical water quality limits protective of beneficial uses <br /> ® =The higher of(2)and (a) for each constituent` <br /> = Contaminated soil WET extract concentrations (µg/1 extract) <br /> © = Contaminated soil potential leachate concentrations (µg/1) _ x 10' <br /> = Background'soil WET extract concentrations (4g/1 extract) <br /> ® = Attenuation°that would be required to protect background water quality = ©� <br /> O =Attenuation'that would be required to protect beneficial uses = © + <br /> Perform the following comparisons in order. <br /> Ground Water: <br /> If(1) <_0, then no water quality impact has yet occurred. <br /> If(2) < T < ®, then water quality has been impacted (degradation has occurred) but <br /> beneficial uses have not yet been affected. <br /> If T >_ ®, then beneficial uses have been affected (pollution has occurred). <br /> Soils: <br /> If© <_0, then contaminated soils pose no threat to water quality; STOP. <br /> if (5) <_©, then contaminated soils pose no threat to water quality; STOP. <br /> If(B > 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 92-19). <br /> b Dilution caused by the WET(50 grams soil in 500 milliliters of extract solution). <br /> d Within clean soil between the base of contaminated soil and the highest elevation of ground water. <br /> J9 10/2/92 <br />