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_~, <br />~~ <br /> <br />CDPHE. Therefore, I would recommend that no water be discharged from either of the DIMP <br />plume areas until the issue is resolved with the CDPHE. <br />Additional comment: <br />If it is anticipated that COC's may be transported in the dewatering pipe to the discharge, then <br />said conveyance should include secondary containment. Secondary containment may include <br />features such as dual-walled pipes, single-walled pipes in a ditch with artificial membrane liner, <br />or other such dual containment system devised by the operator and approved by the Division. <br />Dual-walled pipes should not be installed where near roads where a mobile equipment accident <br />would be likely to rupture both the primary and secondary structures. <br />cc: Carl Mount <br />2 <br />