Robles Sewer Trunk Lining – Arlington to Sunland (California Endangered Species Act Incidental Take Permit No. 2081-2022-018-03 (ITP))

Robles Sewer Trunk Lining – Arlington to Sunland (California Endangered Species Act Incidental Take Permit No. 2081-2022-018-03 (ITP))

The California Department of Fish and Wildlife (CDFW) has issued an ITP (No. 2081-2022-018-03), pursuant to Section 2081(b) of the Fish and Game Code to the City of Santa Rosa. The Project includes the rehabilitation of 3,000 linear feet of reinforced concrete pipe trunk sewer main. The existing underground 45-inch diameter sewer main pipeline is within a City of Santa Rosa-owned easement that spans the entire length of the Project. The trunk sewer main will be rehabilitated using trenchless cured-in-place pipelining technology, which consists of internally inspecting the pipeline via a closed-circuit television feed mounted on a “pig” within the pipeline, cleaning the interior of the pipe, and applying a sealant, fabric liner, and epoxy coat. The trenchless cured-in place pipeline technology will not require excavation, except for two sewer manholes that the fabric liner will be launched from and a road crossing at Arlington Avenue, with a total excavation area of 110 square feet. There will also be work at six manholes not requiring excavation that includes temporary bypass pipeline suction and reinsertion, internal manhole rehabilitation, and liner termination, as outlined below. The Project does not include the construction of any new permanent above-ground surface facilities. The Project will also include an above-ground temporary sewer bypass system for the duration of the Project. The temporary bypass pipeline will be between 12 and 18 inches in diameter and will maintain peak sewer function while the sewer main pipeline is being repaired. The temporary bypass pipeline will be connected to the sewer main via openings in one upstream and one downstream manhole. The temporary bypass pipeline will be removed after the completion of the sewer main repairs. The Project will be divided into two levels of construction activity: High Traffic Areas and Low Traffic Areas. High Traffic Areas include the primary egress and ingress routes, staging and stockpiling locations, liner launch points, non-excavation work areas requiring more extensive vehicle and equipment access (including manhole work areas at Manhole KK2703MH004, Manhole KK2703MH003, and Manhole KK2701MH001 abutting the Low Traffic Areas), the road crossing at Arlington Avenue, and the bypass suction and reinsertion locations. The High Traffic Areas comprise 1.29 acres. Low Traffic Areas include the western and northern portions of the Project where activity will be limited to no more than 40 one-way vehicle trips throughout the course of the Project. The primary work in these areas will include installation of the bypass pipe and liner termination points. Liner termination is done underground inside existing manholes. The bypass pipe will be propped up on wooden blocks every 50 feet within the Low Traffic Areas. In addition, plastic or wooden mats will be placed over wetland habitat within the Low Traffic Areas to avoid soil rutting and crushing vegetation from vehicle traffic. The Low Traffic Areas comprise 1.19 acres. The Project site also includes 0.07 acres of developed land. All Project access will be from Arlington Avenue. The Project will result in impacts to 1.29 acres of California tiger salamander (Ambystoma californiense) habitat including temporary impacts to 1.29 acres; the Project will not permanently remove California tiger salamander habitat. The Project is expected to result in incidental take of California tiger salamander, which is designated as a threatened species under the California Endangered Species Act (CESA). The ITP referenced above as issued by CDFW authorizes incidental take of species listed under CESA that may occur as a result of Project implementation.

Santa Rosa

Sonoma

San Francisco Bay Area

Sonoma