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Mr. Tom Pinkos -3- 28 August 1996 <br /> be adhered to until changed. The 1 x 10-6 incremental cancer risk values presented in the DTSC <br /> memorandum should also be used as appropriate until the published criteria are modified and the risk <br /> values reworked. <br /> Conclusions <br /> We should still require sampling and analysis for 1,4-dioxane at sites found to have had releases of <br /> chlorinated solvents (primarily TCE and 1,1,1-TCA) or ethylene glycol. Cleanup standards and <br /> discharge limitations need to be developed knowing the full suite of contaminants that could require <br /> treatment and/or remediation. Analysis for 1,4-dioxane is by standard EPA methods (Method 8260 <br /> even applies to volatile organics) and will not cause a significant cost to the discharger. The <br /> treatment systems necessary to treat all of the chemicals of concern would be developed and at that <br /> time the incremental cost necessary to treat dioxane can then be calculated. This should be done on <br /> a site-specific basis since it is not always necessary to provide more expensive treatment in order to <br /> adequately remove dioxane. <br /> AMM <br />