OAR 141-089-0675: Minimal Disturbance within ESH – Project-Specific Conditions

(1) Projects eligible for this GA must adhere to the general conditions in OAR 141-089-0650 and the following project-specific conditions: (2) Maintenance and reconstruction projects are conditioned as follows: (a) “Maintenance” has the same meaning as OAR 141-085-0510; (b) “Reconstruction” has the same meaning as OAR 141-085-0510; (c) The structure was serviceable within the last five years; and (d) The maintenance or reconstruction would not significantly adversely affect wetlands or other waters of this state to a greater extent than the wetlands or waters of this state were affected as a result of the original construction of those structures. (3) Scientific Measurement. All scientific measurement devices, including all associated structures and fills including anchoring devices, buoys, and cables, must be removed within 30 days after the research is completed. Where necessary, removal of devices may occur after expiration of a determination pursuant to OAR 141-089-0640(3)(a) without further authorization requirement. (4) Surveys for Historical Resources. All in-stream exploratory excavation must be isolated from the active channel. (5) Investigative Drilling and Sampling. Existing roads, paths and drilling pads must be used where available. Temporary placement of mats is allowed to provide site access. Temporary mats must be removed upon completion of the project. Drill holes must be refilled in accordance with Oregon Water Resources Department requirements. (6) Maintenance and Reconstruction of In-Water Structures. Notwithstanding the definition of “reconstruction” in OAR 141-085-0510, reconstruction does not need to be in-kind if the existing structure contains deleterious materials (e.g., concrete, metals, plastics, angular rock) that will be removed and reconstructed with environmentally preferable materials (e.g., untreated wood, gravel, boulders). (7) Beaver Pond Levelers and Exclusion Devices. At such time that the device(s) are no longer required due to beaver abandonment or removal, or the adverse effects of damming activity have otherwise been resolved, the device(s) must be removed from the waterway. Where necessary, removal of devices may occur after expiration of a determination pursuant to OAR 141-089-0640(3)(a) without further authorization requirement.