Hoisington Water Diversion, Water Impoundment, and Stream Crossings Project. Eight encroachments (Lake or Streambed Alteration Agreement No. 1600-2018-0125-R1)
The project is limited to 8 encroachments. Two projects are points of diversion (PODs) for agricultural use; one from a natural spring and the second is contained in a road cut inboard ditch seep. Four projects are associated with stream crossings. Two of them are to upgrade failing and undersized culverts, one is to install a culvert in place of a dirt ford, and one is to decommission a crossing. One project is to abandon use of road/stream crossing and install and appropriately designed pond spillway to accommodate 100-year flow and associated debris. The final project is to decommission or retain a recently constructed, unpermitted onstream stock pond. Work will be implemented to restore the stream channel to conditions as described in a Stream Restoration and Remediation Plan. Or if pond is retained, work will be to stabilize earthen embankment and install pond structures for a spillway and bypass. Work for these encroachments will include excavation, removal of failing culverts, replacement with new properly sized culverts, backfilling and compaction of fill, and rock armoring as necessary to minimize erosion. Decommissioning of crossing 4 involves removing fill from a stream and setting back the slope. The Notification also discloses 2 water wells located at: 40.4425, -123.6883 and 40.3081, and -123.5976 which both are indicated for agricultural purposes only (Table 2). CDFW did note that the wells are highly likely to be hydrologically connected by location, however, cannot fully evaluate hydraulic connection of the wells to surface water, as no hydrogeologic evaluation was provided for CDFW’s review.