Grant Lake Outlet Valve Replacement Geotechnical Survey (Notification of Lake or Streambed Alteration, No. EPIMS-MOO-66741-R6)

The California Department of Fish and Wildlife has executed Lake and Streambed Alteration Agreement EPIMS-MOO-66741-R6, pursuant to Section 1602 of the Fish and Game Code, for the Los Angeles Department of Water and Power. Located at Grant Lake in Mono County, California, the project consists of geotechnical surveys at 14 locations using sonic drilling methods to reach a total length of 110 feet. The scope includes three borings impacting the lake or shoreline below the high-water mark, with two specifically conducted from a barge or watercraft and one shoreline boring dependent on water levels. Each boring is limited to an impact area of 2 square feet and must be backfilled with bentonite chips through a 6-inch casing. The project is categorized as exempt under California Code of Regulations Title 14, section 15306, with the Los Angeles Department of Water and Power serving as the lead agency. Required equipment for the operation includes a sonic rig, crane, 10-wheel box truck, support truck, forklift, equipment trailer, and watercraft. The administrative oversight involves the California Department of Fish and Wildlife Region 6, with key points of contact including the Watershed Resources Supervisor for LADWP and a Senior Environmental Scientist from the state agency.