The city is proposing to replace old portions of its sewage collection system due to significant structural defects, including cracked pipe sections, partial collapses, and deformed cross-sections. Additionally, there are several sewer mains that lack maintenance access points, such as manholes or rodholes, making maintaining these lines virtually impossible w/o excavation. The city will replace these sewer mains with PVC mains installed solely within the city's and Caltran's existing ROW. The city will install a sufficient number of concrete manholes to facilitate proper maintenance of the new sewer mains. Laterals for each parcel served by these sewers will be replaced within the ROW, and a two-way cleanout will be installed at the property line. No work is anticipated on privately owned property. Additionally, the city has been informed by Caltrans that in the near future, Main St will be repaved with concrete. This would significantly hinder the city's ability to excavate and make necessary repairs to pipelines in Main St. In order to minimize issues related to future maintenance of the pipeline in Main St, the city proposes to abandon the older and smaller clay interceptor line and divert all flows into the larger existing PVC parallel interceptor line from Lennox St to Oberlin Rd. This work will require connecting all laterals and mains currently attached to the clay interceptor line to the PVC interceptor line. The proposed improvements will cross one jurisdictional drainage ditch located in the Burgess St ROW, just north of Virginia St.
The project includes installation of an access vault at the city's corporation yard to allow the city to properly access and maintain the existing siphon that crosses under Yreka Creek from Deer Creek Way. Work on the access vault would be confined to the Corporation Yard property; no improvements would be completed in proximity to the creek. The corporation yard also would be used for staging of construction equipment and materials. The purpose of the project is to ensure reliable sewer service for the benefit of the city's utility customers.
Class 1 includes the repair, maintenance, or minor alteration of existing public structures, facilities, and mechanical equipment, involving negligible or no expansion of use; class 2 includes replacement or reconstruction of existing utility systems and/or facilities involving negligible or no expansion of capacity; and class 4 includes minor trenching and backfilling on land with a slope of less than 10 % where the surface is restored.