The US Environmental Protection Agency (EPA) has a scientifically sound and implementable rule for governing the use and disposal of biosolids — 40 CFR Part 503 (10). The Part 503 rule has been subjected to four additional rulemaking activities since it was promulgated in final
form in February 1993. Two of these additional rulemaking activities are final. The first included the removal of most molybdenum standards from the rule, pending receipt of sufficient new data for their re-proposal, and, the addition of carbon monoxide as an alternate method of monitoring
incinerator performance. The second final change to the Part 503 rule included making the incineration standards selfimplementing, and allowing the monitoring of Class B biosolids for fecal coliform levels to be anytime and not just at the time of final use or disposal. The most recently proposed
amendment to the rule contains a proposed toxic equivalent standard of 300 ppt for dioxin, dibenzofurans, and coplanar PCB's that must be met if biosolids are land applied. (64 FR 246 72045–72062, Dec. 23, 1999) The comment period for this proposed rule closed on March 23,
2000 and comments are now being evaluated. There will be a peer review of this proposed “dioxin” standard including the risk assessment that supported the proposed 300 ppt limit.
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