Cal. Public Resources Code § 4514.3

(a) Timber operations conducted pursuant to this chapter are exempt from the waste discharge requirements of Article 4 (commencing with Section 13260) of Chapter 4 of Division 7 of the Water Code as long as both the federal Environmental Protection Agency and the State Water Resources Control Board certify after January 1, 2003, that the provisions of this chapter constitute best management practices for silviculture pursuant to Section 208 of the Federal Water Pollution Control Act. (b) The exemption contained in subdivision (a) does not apply when any of the following occurs: (1) The board requests issuance of waste discharge requirements. (2) There has been a finding by the State Water Resources Control Board that the board has failed to maintain a water quality regulatory process consistent with the certification required under subdivision (a). (3) After monitoring the water quality impacts from timber operations conducted in compliance with this chapter, there has been a finding by the State Water Resources Control Board that compliance with best management practices would result in less water quality protection than required in water quality control plans approved pursuant to Section 13245 of the Water Code.