43 C.F.R. § 11.35

How does the trustee decide whether to use Type A or Type B procedures?

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(a) If the natural resource trustee determines under § 11.34 that a Type A procedure is available, the trustee must then decide whether to use that procedure or use a Type B procedure. The trustee must make this decision by weighing the difficulty of collecting site-specific data against the suitability of the averaged data and simplifying assumptions in the Type A procedure for the release being assessed. The trustee may use a Type B procedure if they can be performed at a reasonable cost and if the increase in accuracy provided by those procedures outweighs the increase in assessment costs.

(b) If there is no appropriate Type A procedure, the trustee must use a Type B procedure to calculate all damages.

[91 FR 42878, July 13, 2026]
Notes of Decisions
Cited in 4 cases, 1989–1998 · leading case: Boeing Co. v. Aetna Cas. & Sur. Co., 784 P.2d 507 (Wash. 1990).
Boeing Co. v. Aetna Cas. & Sur. Co., 784 P.2d 507 (Wash. 1990). · cites it 4× “) 43 C.F.R. § 11.35 (b)(2). Natural resource damages must be based on actual injury or loss.”
Kennecott Utah Copper Corp. v. United States Dep't of the Interior, Am. Iron & Steel Inst., Intervenor, 88 F.3d 1191 (D.C. Cir. 1996). · cites it 2× “" 43 C.F.R. § 11.35 (d). We see no basis for questioning Interior's decision.”
Nat'l Ass'n of Mfrs. v. United States Dep't of the Interior, 134 F.3d 1095 (D.C. Cir. 1998). · cites it 2× “” 43 C.F.R. § 11.35 (a) (1996). The trustee may elect to use Type B procedures if “they can be performed at a reasonable cost and if the increase in accuracy outweighs the increase in assessment costs.”
Ohio v. United States Dep't of Interior, 880 F.2d 432 (D.C. Cir. 1989). “” 43 C.F.R. § 11.35 (b)(2) (1987) (emphasis added).”
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