486
Opinion of the Court
ence to waste which "may present" imminent harm quite clearly excludes waste that no longer presents such a danger. As the Ninth Circuit itself intimated in Price v. United States Navy, 39 F. 3d 1011, 1019 (1994), this language "implies that there must be a threat which is present now, although the impact of the threat may not be felt until later." It follows that § 6972(a) was designed to provide a remedy that ameliorates present or obviates the risk of future "imminent" harms, not a remedy that compensates for past cleanup efforts. Cf. § 6902(b) (national policy behind RCRA is "to minimize the present and future threat to human health and the environment").
Other aspects of RCRA's enforcement scheme strongly support this conclusion. Unlike CERCLA, RCRA contains no statute of limitations, compare § 9613(g)(2) (limitations period in suits under CERCLA § 9607), and it does not require a showing that the response costs being sought are reasonable, compare §§ 9607(a)(4)(A) and (B) (costs recovered under CERCLA must be "consistent with the national contingency plan"). If Congress had intended § 6972(a) to function as a cost-recovery mechanism, the absence of these provisions would be striking. Moreover, with one limited exception, see Hallstrom v. Tillamook County, 493 U. S. 20, 26-27 (1989) (noting exception to notice requirement "when there is a danger that hazardous waste will be discharged"), a private party may not bring suit under § 6972(a)(1)(B) without first giving 90 days' notice to the Administrator of the EPA, to "the State in which the alleged endangerment may occur," and to potential defendants, see §§ 6972(b)(2)(A)(i)- (iii). And no citizen suit can proceed if either the EPA or the State has commenced, and is diligently prosecuting, a separate enforcement action, see §§ 6972(b)(2)(B) and (C). Therefore, if RCRA were designed to compensate private parties for their past cleanup efforts, it would be a wholly irrational mechanism for doing so. Those parties with in-substantial problems, problems that neither the State nor
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