HARDESTY WATER DIVERSION AND STREAM CROSSINGS (Lake or Streambed Alteration Agreement No. 1600-2019-0139-R1)

HARDESTY WATER DIVERSION AND STREAM CROSSINGS (Lake or Streambed Alteration Agreement No. 1600-2019-0139-R1)

The project is limited to 3 encroachments. POD-1 is located on an un-named spring tributary to Painter Gulch which is a tributary to Yager Creek. The diversion is located on a neighboring parcel APN 314-311-009 and the landowner has deeded rights to use the spring. The intake consists of a wooden spring box emplaced in the ground. From the POD water is gravity fed to a 500-gallon holding tank via a 1-inch black poly line; then water is gravity fed to a 2,500-gallon water tank equipped with a float valve to stop diversion when full. From the 2,500-gallon tank, water is pumped through a 1.5-inch water line using a solar powered pumped to the ~6-acre vineyard for irrigation using a pressurized drip irrigation system. Approximately 70,000 gallons is diverted each month for irrigation from May 15th through September 15th. The vineyard was recently planted and requires irrigation in the early years, while the roots are becoming established, eventually the irrigation from the POD will stop and the transition to dry farming will begin. The landowner anticipates that the vineyards will be primarily dry farmed by spring of 2023. STX-1. A Class Ill stream with a 30-inch diameter steel culvert. The culvert is not sized to pass the 100-year peak streamflow and associated debris and is rusted through the bottom. Additionally, the culvert is installed high in the fill which is causing erosion at the outlet. The right and left road approaches are also hydrologically connected to the stream crossing, and no diversion potential exists. The culvert will be replaced with a 54-inch dia. x 40-foot long culvert sized for 100-year peak streamflow and associated debris, installed at channel grade, and at the base of till. Additionally, the culvert will allow for the passage of aquatic organisms. At least one rolling dip will be installed along the right road approach and one on the left road approach to reduce hydrologic connectivity and prevent surface erosion. STX-2. A Class 11 stream with a 30-inch diameter steel culvert. The culvert is not sized to pass the 100-year peak streamflow and associated debris and is rusted through the bottom. Additionally, the culvert is installed high in the fill which is causing some minor erosion at the outlet, the right and left road approaches are also hydrologically connected to the stream crossing, and no diversion potential exists. The culvert will be replaced with a 60-inch dia. x 40-foot long culvert sized for 100-year peak streamflow and associated debris, installed at channel grade, and at the base of fill. Additionally, the culvert will allow for the passage of aquatic organisms. At least one rolling dip will be installed along the right road approach and one on the left road approach to reduce hydrologic connectivity and prevent surface erosion.

Humboldt