“Technical Review Support / Analysis of conceptual design for ephemeral channel adjacent to Sonoita Creek,” requests the development of a Technical Memo providing a review of the technical feasibility of the conceptual compensatory mitigation plan to construct ephemeral channels adjacent to Sonoita Creek, near the town of Patagonia, Santa Cruz County, Arizona. Rosemont has employed Water and Earth Technologies (WET), Incorporated to provide the construction design and Westland Resources, Inc. (“Westland”) for restoration related to construction. To date, several revisions of the design have been submitted. We used the most recent plan, “Conceptual Design for Ephemeral Channel Adjacent to Sonoita Creek” dated August 12, 2014 (the “WET report”) for this technical review. EPA also requested consideration of technical comments prepared by its staff on several earlier versions of the proposed ephemeral channel design. We reviewed those previous comments and determined that our findings were consistent with EPA’s comments on prior versions of the design.
Kondolf, M., and J. Ashby. 2015. Technical Memorandum – Conceptual Design for Sonoita Creek, AZ, Technical Review Support (Order Number EP-G149-00241). PG Environmental. July 27.