Today's final rule revises the waste treatment standards applicable to 40 waste constituents associated with the production of carbamate wastes. The rule sets final alternative treatment standards for seven specific carbamate waste constituents for which there are no available analytical standards. This action, effective immediately, extends indefinitely the alternative treatment standards for the seven hazardous waste constituents and deletes the treatment standard for one additional constituent for which available analytical methods have not been shown to achieve reliable measurements. This rule also deletes these eight waste constituents as underlying hazardous constituents. In addition, because the temporary alternative standards for 40 carbamate waste constituents expire automatically on August 26, 1998, today's rule also amends the Code of Federal Regulations to clarify that numerical treatment standards for these 32 carbamate waste constituents will once again be effective. Today's rule is necessary to allow generators the ability to identify all underlying hazardous constituents reasonably expected to be present in their wastes at the point of generation, and to allow waste treaters to certify that wastes have been treated in compliance with applicable land disposal restrictions. Faced with the inability to demonstrate waste and treatment residual content through analytical testing, these facilities face potential curtailment of operations. Given the need for the regulated community to adjust its testing and compliance programs for the 32 constituents for which numerical treatment standards are being reinstated, the Agency is extending the current set of alternative treatment standards for these 32 constituents (and concomitantly delaying the effectiveness of the corresponding portion of today's final rule) for six months from the date of publication.