{"data":{"id":"us/40-cfr-147.3106","jurisdiction":"us","citation":"40 CFR 147.3106","heading":"Area of review.","body":"(a) When determining the area of review under § 146.6(b) of this chapter, the fixed radius shall be no less than one mile for Class I wells and one-half mile for Class II and III wells. In the case of an application for an area permit, determination of the area of review under § 146.6(b) shall be a fixed width of not less than one mile for the circumscribing area of Class I projects and one-half mile for the circumscribing area of Class II and III projects.\n(b) However, in lieu of § 146.6(c) of this chapter, if the area of review is determined by a mathematical model pursuant to paragraph § 146.6(a) of this chapter, the permissible radius is the result of such calculation even if it is less than one mile for Class I wells and one-half for Class II and III wells.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER D—WATER PROGRAMS","PART 147—STATE, TRIBAL, AND EPA-ADMINISTERED UNDERGROUND INJECTION CONTROL PROGRAMS","Subpart III—Lands of Certain Oklahoma Indian Tribes"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-40.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:04Z","sha256":"d15a4ce25e3c38845555dcde08db0880e58b4e35ef56974bae20a359bb50a8f7","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-147.3105","next":"us/40-cfr-147.3107"},"notice":"GroundRules: Original legal text. Not legal advice."}