Alturas Wastewater Treatment Plant Improvement Project

The Alturas Wastewater Treatment Plant Improvement Project, identified by project number 8292-210 and solicitation number EPIMS-MOD-63461-R1, is a public works initiative funded by the State Water Resources Control Board and led by the City of Alturas. The project involves decommissioning the existing wastewater treatment plant in Modoc County, California, and establishing a new treatment and disposal system. Key infrastructure developments include the installation of an 11,000 linear feet force main and the construction of offsite aeration, evaporation, and percolation ponds located 1.4 miles southwest of the current facility for treatment and land discharge. To minimize environmental impact, the project utilizes horizontal directional drilling for three bores of approximately 3,000 feet each at depths of 60 to 80 feet to install the pipeline under the North Fork Pit River, South Fork Pit River, and an unnamed ephemeral tributary. The project is governed by a Mitigated Negative Declaration under the California Environmental Quality Act and Lake or Streambed Alteration Agreement No. EPIMS-MOD-63461-R1. Administrative oversight is managed by the City of Alturas, with coordination from the California Department of Fish and Wildlife and the State Water Resources Control Board to ensure adherence to mitigation monitoring and reporting plans.