EDMONDSON, Circuit Judge:

Pursuant to the Resource Conservation and Recovery Act of 1976, 42 U.S.C. § 6901-6992k (1982 Supp. V 1987) ("RCRA"), the Environmental Protection Agency ("EPA") issued a final operating permit for the nation's largest hazardous waste management facility, located at Emelle, Alabama. We are asked to decide whether EPA's procedures in issuing the permit were sufficient to exempt EPA from performing an environmental impact study in compliance with the National Environmental Policy Act, 42 U.S.C. § 4321-4370b (1982 Supp. V 1987) ("NEPA"). The answer is "Yes." We are also asked to decide whether EPA violated its own procedural requirements governing public participation and whether EPA's waiver of a ground water monitoring requirement was arbitrary and capricious. The answer is "No." We affirm the EPA Administrator's decision to uphold EPA's issuance of the permit for the Emelle facility.

I. BACKGROUND

The Emelle facility, owned and operated by Chemical Waste Management, Inc. ("ChemWaste"), receives hazardous wastes from forty-eight states. The facility covers 2730 acres of land and includes twenty inactive landfill trenches, one active trench, an aqueous waste storage pond, a waste drum storage area, a liquid waste tank storage area, a liquid waste solidification unit, and a solvent and fuel recovery area. Emelle receives almost every type of hazardous waste identified in the RCRA regulations at 40 C.F.R. Part 261, including waste that is toxic, corrosive, flammable, and reactive, but does not accept municipal refuse or garbage, radioactive wastes, or explosive wastes.

RCRA, which establishes a "cradle-to-grave" system for regulating the treatment, storage, and disposal of hazardous wastes, requires hazardous waste management facilities like Emelle to receive an operating permit from EPA. See 42 U.S.C. § 6925. Alabama requires that hazardous waste management facilities also obtain an operating permit from the state, see Ala. Code § 22-30-12 (1989); such permits are issued by the Alabama Department of Environmental Management ("ADEM").

Under RCRA, facilities that were already in operation in November 1980 are allowed to continue operating on an interim basis until a final permit can be issued. See 42 U.S.C. § 6925(e). ChemWaste, operating the Emelle facility under an interim permit, filed its application for a final permit in 1983. ChemWaste's application requested authority to operate the facility permanently and to expand the facility. ChemWaste proposed adding four landfill trenches and a large amount of container storage facilities and asked for a waiver of ground water monitoring relative to the landfill disposal.

EPA's Regional Office, after determining that ChemWaste's application for a final RCRA permit was complete, issued a "draft" permit in 1986, commencing a period for public hearing and comments. Jointly with ADEM, EPA held a public hearing in Alabama and accepted and responded to comments from interested parties. In 1987, EPA issued the final permit for the Emelle facility, approving ChemWaste's proposed expansions and waiving certain ground water monitoring requirements. To our knowledge, ADEM has not issued a final state permit; ADEM's actions are not challenged in this appeal.

When EPA issued Emelle's permit, EPA did not prepare an environmental impact study ("EIS") under NEPA. EPA followed one of its own regulations, promulgated in 1980 shortly after RCRA took effect, which states EPA's position that the RCRA permit process supplants the requirements of NEPA and that EPA need not comply with NEPA when granting RCRA permits. See 40 C.F.R. § 124.9(b)(6).

The petitioners in this case are the State of Alabama and four citizen organizations: Alabamians for a Clean Environment; the Alabama Chapter of the Sierra Club; the Alabama Conservancy; and Greenpeace, U.S.A. Petitioners appealed the EPA Regional Office's issuance of ChemWaste's permit to the EPA Administrator, who refused to rescind Emelle's permit, ruling that EPA had not violated NEPA because the RCRA permit process was functionally equivalent to the requirements of NEPA. The Administrator also said that EPA had satisfied all procedural requirements for issuing the permit and had not acted arbitrarily in allowing a waiver of ground water monitoring. The Administrator's decision is the basis of this appeal. Under the Administrative Procedure Act, 5 U.S.C. § 701-706 (1982), our role is to determine: (1) whether EPA acted within the scope of its authority; (2) whether EPA's decision to issue the permit was "arbitrary, capricious, an abuse of discretion, or otherwise not in accordance with law"; and (3) whether EPA followed procedural requirements in issuing the permit. See 5 U.S.C. § 706(2)(A); Citizens to Preserve Overton Park v. Volpe, 401 U.S. 402, 413-17, 91 S.Ct. 814, 822-24, 28 L.Ed.2d 136 (1971).

II. DISCUSSION

A. Collateral Estoppel

Following EPA's public meeting to accept oral comments on the draft permit, the four citizen organizations aligned as petitioners in this case brought an action in federal district court in Alabama. See Alabamians for a Clean Environment v. EPA, 26 ERC 2116 (N.D.Ala. 1987). The citizen organizations asked the district court to enjoin EPA from issuing a final permit for Emelle; the organizations argued that EPA was required to perform an EIS in compliance with NEPA. The district court refused to grant the injunction and instead dismissed the case for failure to state a claim under Fed.R.Civ.P. 12(b)(6), ruling that EPA was not obliged to comply with NEPA when exercising its permitting authority under RCRA. The district court said that RCRA placed requirements on EPA that were functionally equivalent to the requirements of NEPA. The citizen organizations did not appeal.

EPA contends that the issue of whether it was required to perform an EIS in compliance with NEPA is barred in this case by collateral estoppel. Petitioners here concede that they are raising the identical issue of whether EPA was required to comply with NEPA in issuing a RCRA permit to the Emelle facility, but petitioners urge this court to conclude that the State of Alabama is not bound by the earlier decision.

We agree with petitioners that the State of Alabama is not precluded from pursuing this issue. Although ADEM, an Alabama state agency, was a defendant in the action in district court, ADEM was not involved in litigating the question of EPA's duties in the light of NEPA. ADEM was a defendant under a separate count of the complaint that alleged a due process violation in connection with the state's permitting procedures. Accordingly, even if Alabama is in privity with ADEM, neither ADEM nor Alabama are bound by the district court decision on an issue arising between other parties and not affecting ADEM. See Stryker v. Crane, 123 U.S. 527, 538-39, 8 S.Ct. 203, 208-09, 31 L.Ed. 194 (1887); Stafford v. General Supply Co., 5 Wis.2d 137, 92 N.W.2d 267, 271 (Wis. 1958); see also Hurt v. Pullman, Inc., 764 F.2d 1443, 1448-50 (11th Cir. 1985). Put differently, because the plaintiffs stated no cause of action against and sought no relief from ADEM on account of EPA's refusal to follow NEPA, and because ADEM filed no cross-claim against EPA on the question, ADEM was not a party to the litigation of the NEPA issue in district court.

B. Compliance with NEPA

By enacting NEPA, Congress declared a broad national commitment to protecting and promoting environmental quality. See Robertson v. Methow Valley Citizens Council, 490 U.S. 332, 109 S.Ct. 1835, 1844, 104 L.Ed.2d 351 (1989). To ensure that this commitment is implemented throughout the federal government, NEPA forces federal agencies to prepare detailed studies of the environmental effects of their actions. These studies serve two important purposes: (1) the agency is forced to consider carefully detailed information about significant environmental impacts; and (2) relevant environmental information is made available to the members of the public, who can then play a role in the agency's decisionmaking process and implementation of that decision. See Robertson, 490 U.S. at ___, 109 S.Ct. at 1845.

NEPA requires that "to the fullest extent possible . . . all agencies of the Federal government shall . . . include in every recommendation or report on proposals for legislation and other major Federal actions significantly affecting the quality of the human environment, a detailed statement by the responsible official on — (i) the environmental impact of the proposed action. . . ." 42 U.S.C. § 4332. So, a federal agency must ordinarily prepare an EIS whenever the agency's action will have a significant effect on the environment. See Environmental Defense Fund, Inc. v. EPA, 489 F.2d 1247, 1255 (D.C. Cir. 1973).

No one disputes that EPA's action in granting a final operating permit to the nation's largest commercial hazardous waste management facility — a facility that handles almost every type of hazardous waste identified by RCRA regulations — is a "major Federal action" that will significantly affect the human environment. The parties in this case, however, disagree about whether EPA had to comply with NEPA's EIS requirements. EPA contends that RCRA's permit issuance process takes the place of NEPA. In other words, EPA contends that, in the context of approving operating permits for hazardous waste management facilities, RCRA functions as the equivalent and more specific legislative safeguard of the environment. But petitioners contend that NEPA applies to EPA's action under RCRA and that RCRA is not functionally equivalent to NEPA.

We are not the first judges called upon to decide whether NEPA applies to actions taken by EPA. Although NEPA says that "all agencies" must comply with its terms, most circuits have already recognized — in some instances, as many as seventeen years ago — that an agency need not comply with NEPA where the agency is engaged primarily in an examination of environmental questions and where "the agency's organic legislation mandate[s] specific procedures for considering the environment that [are] functional equivalents of the impact statement process." Texas Committee on Natural Resources v. Bergland, 573 F.2d 201, 207 (5th Cir. 1978). See also, e.g., State of Wyoming v. Hathaway, 525 F.2d 66, 70 (10th Cir. 1975); Indiana Michigan Elec. Co. v. EPA, 509 F.2d 839, 843 (7th Cir. 1975); South Terminal Corp. v. EPA, 504 F.2d 646, 676 (1st Cir. 1974); Portland Cement Ass'n v. Ruckelshaus, 486 F.2d 375, 380 (D.C. Cir. 1973); Buckeye Power, Inc. v. EPA, 481 F.2d 162, 174 (6th Cir. 1973); Appalachian Power Co. v. EPA, 477 F.2d 495, 508 (4th Cir. 1973).

This idea of limiting the sweep of NEPA stems, in part, from the traditional view that specific statutes prevail over general statutes dealing with the same basic subjects. See Merrell v. Thomas, 807 F.2d 776, 778, 779 (9th Cir. 1986) (NEPA inapplicable where Federal Insecticide, Fungicide, and Rodenticide Act, 7 U.S.C. § 136-136y (1982 Supp. V 1987), provided more specific registration requirements). See generally Busic v. United States, 446 U.S. 398, 406, 100 S.Ct. 1747, 1753, 64 L.Ed.2d 381 (1980) (more specific statute is given precedence over more general one, regardless of temporal sequence). NEPA is the general statute forcing agencies to consider the environmental consequences of their actions and to allow the public a meaningful opportunity to learn about and to comment on the proposed actions. If there were no RCRA, NEPA would seem to apply here. But RCRA is the later and more specific statute directly governing EPA's process for issuing permits to hazardous waste management facilities. As such, RCRA is an exception to NEPA and controls here.

Petitioners complain, and EPA agrees, that RCRA does not require EPA to consider every point the agency would have to consider in preparing a formal EIS under NEPA; thus, NEPA and RCRA conflict. Still, RCRA is the functional (though not the structural or literal) equivalent and more specific counterpart of NEPA. RCRA is comprehensive in its field of application. RCRA's substantive and procedural standards are intended to ensure that EPA considers fully, with the assistance of meaningful public comment, environmental issues involved in the permitting of hazardous waste management facilities. The RCRA permitting procedures "strike a workable balance between some of the advantages and disadvantages of full application of NEPA." Portland Cement, 486 F.2d at 386 (finding section 111 of Clean Air Act functionally equivalent to NEPA); see Amoco Oil Co., 501 F.2d at 750; Warren County v. State of North Carolina, 528 F. Supp. 276, 287 (E.D.N.C. 1981).

NEPA's environmental impact statement is merely an implement devised by Congress to require government agencies to think about and weigh environmental factors before acting. Considered in this light, an organization like EPA whose regulatory activities are necessarily concerned with environmental consequences need not stop in the middle of its proceedings in order to issue a separate and distinct impact statement just to be issuing it. To so require would decrease environmental protection activity rather than increase it.

Hathaway, 525 F.2d at 71-72 (footnote omitted). We believe that Congress did not intend for EPA to comply with NEPA when RCRA applies to the particular EPA activity. We hold that, in considering ChemWaste's application for a final permit for the Emelle facility, EPA did not have to comply with NEPA.

C. Compliance with Procedural Requirements

Petitioners contend that EPA violated its own procedural regulations and policies in issuing the Emelle permit. Specifically, petitioners claim that EPA: (1) had extra-record communications with ChemWaste during the public comment period; (2) collected additional information after the close of the public comment period without reopening the comment period; (3) failed to provide a meaningful opportunity for the public to participate in the permitting process; and (4) failed to maintain objectivity in considering ChemWaste's application.

The first two allegations are improperly before us because petitioners failed to raise them on appeal to the EPA Administrator. Absent exceptional circumstances, "an appellate court should not overrule an administrative decision unless the administrative body erred against objections presented to it." Taft v. Alabama By-Products Corp., 733 F.2d 1518, 1523 (11th Cir. 1984) (citing United States v. L.A. Tucker Truck Lines, Inc., 344 U.S. 33, 37, 73 S.Ct. 67, 69, 97 L.Ed. 54 (1952)). Petitioners argue that exceptional circumstances existed as a result of the administrative appeal process, but we do not think so.

Petitioners filed their administrative appeal by submitting a petition that requested the EPA Administrator's review, see 40 C.F.R. § 124.91; this petition did not raise the two pertinent procedural arguments. After the Administrator considered the petition, he accepted briefs on the only issue raised in the petition that he deemed worthy of review, an issue dealing with emissions from the proposed incinerator. Because the Administrator declined to accept briefs on other issues, petitioners argue that they were never required to brief their procedural arguments fully. But even if petitioners were never required to brief the issues fully, they were required to raise them in their petition seeking the EPA Administrator's review. As it was, the Administrator had no chance to consider asking for briefs on these two issues.

Petitioners' second two allegations of procedural deficiency were considered and rejected by the EPA Administrator. We affirm the Administrator on those issues. First, we reject the argument that EPA failed to provide a meaningful opportunity for public participation (1) by making it difficult for members of the public to obtain information about the permit application; (2) by failing to provide such information in a form understandable by the public; and (3) by failing to conduct more than a "pro forma" public information meeting on the day of the public hearing. We see nothing in the record that would demand such a finding. EPA made available copies of relevant documents at the local public library, at the county probate judges' office, and at ADEM's trailer at the Emelle facility. EPA also made available to anyone who requested it a seventeen-page "fact sheet," which provided a detailed description of the draft permit and of procedures governing public comments. And although EPA held a public question and answer session on the same day as the public hearing, there was adequate time afterwards for additional written comments to be filed. EPA was required to leave the comment period open for only forty-five days, but it allowed eighty-six days; EPA received 145 written comments and 78 oral statements. We cannot say that EPA failed to provide a meaningful opportunity for public participation.

Second, we reject petitioners' contention that EPA lacked the necessary objectivity to make an impartial decision about ChemWaste's application because several former EPA officials now work for ChemWaste and because EPA uses the Emelle facility to dispose of hazardous waste generated in "Superfund" cleanups. Neither of these allegations is sufficient to overcome the presumption that governmental officials perform their functions without bias. See Schweiker v. McClure, 456 U.S. 188, 195, 102 S.Ct. 1665, 1670, 72 L.Ed.2d 1 (1982); National Labor Relations Bd. v. Ohio New and Rebuilt Parts, Inc., 760 F.2d 1443, 1451 (6th Cir. 1985).

We have refused to invalidate an agency's decision on the ground of bias simply because a decisionmaker came to the regulatory agency from a regulated enterprise, recognizing that the same rule would apply when the decisionmaker left the agency to work for the regulated enterprise. See Alabama Public Serv. Comm'n v. Interstate Commerce Comm'n, 765 F.2d 1516, 1524 (11th Cir. 1985). In addition, petitioners' bare allegation that EPA disposes of hazardous waste generated in federal cleanup operations at the Emelle facility does not show bias. If EPA's use of a commercial facility for disposal of Superfund wastes automatically biased EPA in RCRA permit proceedings, EPA might never issue a valid RCRA permit.

D. Waiver of Ground Water Monitoring Requirement

RCRA and implementing regulations generally require hazardous waste management facilities to monitor the ground water for contaminants that might migrate from landfill disposal areas, unless a basis exists for EPA to grant a waiver. See 42 U.S.C. § 6924( o), (p); 40 C.F.R. Part 264, Subpart F. In the final permit for the Emelle facility, EPA included a provision that waived ChemWaste's obligation to monitor the ground water in the "uppermost aquifer," the closest significant water supply to the surface. See 40 C.F.R. §§ 170.2, 260.10 (defining "uppermost aquifer"). Petitioners argue that EPA's decision, finding a basis for the waiver, was arbitrary and capricious because the decision was based on erroneous conclusions of fact.

EPA may waive the ground water monitoring requirement in a final permit if the applicant facility shows that there is no potential for liquid wastes to migrate from landfill trenches into the uppermost aquifer during the period spanning both the active life of the landfill trench and the post-closure care of the trench. See 42 U.S.C. § 6924(p); 40 C.F.R. § 264.90(b)(4). EPA found that the uppermost water supply under the Emelle facility was 700 feet below the ground's surface. Petitioners contend that this determination is wrong because evidence of more shallow ground water exists. During the public comment period, petitioners brought to EPA's attention five shallow wells being used by residents of the Emelle area. EPA investigated these five wells, along with a sixth well that EPA itself discovered, and conducted tests to determine if the wells were being fed from a significant water source closer to the surface than 700 feet. EPA found that they were not.

In addition, EPA found that the uppermost aquifer at the Emelle facility was protected by 700 feet of dense chalk. According to EPA, ChemWaste sufficiently demonstrated that liquid waste would not migrate from a landfill trench through this chalk and into the water supply in less than 300 years. The time projected for a landfill trench's active life and post-closure care at the Emelle facility totals forty years.

We cannot reverse EPA's decision to allow a ground water monitoring waiver: the agency's decision is within EPA's statutory authority, is not clearly wrong, and appears to be based on considered and carefully articulated expert opinion. See, e.g., EPA Memorandum, Waiver of 40 CFR 264 Subpart F Requirements for Releases into the Uppermost Aquifer from Regulated Units, Attached Report from Golder Assocs., Consulting Geotechnical and Mining Engineers, dated March 25, 1987, ROA-Exh. 348; EPA Memorandum, Field Trip to Inspect Shallow Dug Wells in Sumter County, Alabama, dated March 27, 1987, ROA-Exh. 350. "Particularly when we consider a purely factual question within the area of competence of an administrative agency created by Congress, and when resolution of that question depends on `engineering and scientific' considerations, we recognize the relevant agency's expertise unless it is without substantial basis in fact." Federal Power Comm'n v. Florida Power Light Co., 404 U.S. 453, 463, 92 S.Ct. 637, 644, 30 L.Ed.2d 600 (1972).

AFFIRMED.