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Sharpe -UST 3 <br /> Considering the MCL for lead is 15ppb and Prop. 65 requirements are involved when <br /> greater than 10% of samples contain 0.25 ppb lead I believe that a far lower <br /> concentration in the soil should be considered for cleanup. I recommend that WET data, <br /> modified with deionized water be collected to evaluate leachable lead concentrations <br /> and use those values to asses potential impacts on water quality and to develop cleanup <br /> standards. Calculation of the volume of soil to be removed for cleanup to 500 ppb is <br /> approximately 300 yds. <br /> cic <br />