Owens Lake T13-1, T13-1 Addition, T17-1, T17-2 North and T17-2 South Emergency Storm Repair
The Los Angeles Department of Water and Power (LADWP) is pursuing an interim and regular variance from enforcement of Great Basin Unified Air Pollution Control District (GBUAPCD) Board Order 160413-01, GBUAPCD Rule 433, and Notice to Comply No. 2002 for dust control area (DCA) T13-1 (includes T13-1 and T13-1 Addition, operated as one unit, hereafter T13-1). This Board Order and Rule require LADWP to implement a Best Available Control Measure (BACM) and achieve dust control performance criteria in designated DCAs during the dust season. Between August 5, 2022, and September 13, 2022, three extraordinary high intensity rainfall events occurred in the upper Centennial Wash watershed. Known as Tropical Storm Kay, these events caused the Governor of California to declare an emergency along with the counties of Inyo, Los Angeles, Imperial, Riverside, and San Bernardino. These natural disasters resulted in extreme flash flooding that impacted the eastern portion of Centennial Wash Alluvial fan as well as the Owens Lakebed, including the Variance Areas discussed below.
Portions of DCAs T13-1, T13-1 Addition, T17-1, T17-2 North and T17-2 South are included in this variance (Variance Areas). Portions of these DCAs and their associated infrastructure (i.e. irrigation laterals, whipline, partitions/ berms, risers) were damaged or buried with sediment by the flash flood events. LADWP will rehabilitate the damaged DCA’s by removing deposited sediment and grading; repairing and unburying irrigation laterals and risers; repairing and constructing partitions/ berms; repairing, realigning, and installing whiplines; and flushing irrigation laterals and whiplines.
Ground disturbance activities would be monitored by qualified tribal monitors as a precautionary measure.