Regional Water Quality Control Board, Region 1 (North Coast), Santa Rosa
Lago Ranch Culvert Replacement Project
NOE - Notice of Exemption
The primary purpose of the project is to remove and replace an existing failing driveway culvert. The existing 20 linear foot concrete culvert failed through to the roadway and along the outfall delivering sediment into the creek necessitating the use of steel plates for residents only crossing of the creek. The applicant proposes to set up a diversion and baker tank to divert approx 80 lf of the flowing creek around the work site to prepare the site for construction and then remove the existing failed culvert and approx 18 lf of unpermitted gabion baskets. The project includes plans for re-contouring the existing channel through the culverted area to remove grade control barriers that cause backwatering. The plans include installation of precast sections of culvert facility, 56 lf of 72-in reinforced concrete pipe (100 year storm capacity) and set in place with approx 46 cy of concrete slurry. The plans includes regrading slopes and installation of approx 46 lf of bioengineered rock slope protection to prevent additional bank instability that is currently delivering sediment to the creek.
The project involves removal and replacement of the existing failed culvert with a new culvert at the same site for the same purpose and function.
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