Owens Lake T1A-4 Addition & T0-3a Addition Geotechnical Investigation


SCH Number
Public Agency
Los Angeles Department of Water and Power
Document Title
Owens Lake T1A-4 Addition & T0-3a Addition Geotechnical Investigation
Document Type
NOE - Notice of Exemption
Document Description
On July 7, 2021, the Great Basin Unified Air Pollution Control District issued an Owens Lake Contingency PM10 Control order for a 34-acre area located immediately north of existing dust control area (DCA) T1A-4. LADWP is now required to implement Best Available Control Measures in the 34-acre area within three years of the order date. LADWP is exploring the need to implement dust mitigation measures in areas adjacent to existing dust control areas T1A-4 (120 acres including the ordered area) and T10-3a (26 acres). These areas (designated as T1A-4 Addition and T10-3a Addition) may be contributing to sand deposition in existing control areas resulting in increased maintenance. In order to ensure the quality of the design, a geotechnical field investigation with borings is necessary to collect subsurface data that will identify the soil types in the DCAs. A total of 8 geotechnical exploratory boreholes are proposed at T1A-4, and a total of 4 boreholes at T10-3a Addition. The depth of each borehole will be a maximum of 15 feet, and the diameter of each borehole will be a maximum of 8 inches (typically 4 inches). It is estimated to take 2 to 4 days to complete the field investigation work. A geotechnical engineer or geologist will be on site to work with the drilling crew and observe and log the soils extracted from the boreholes. The area has been recently surveyed for avoidance of any potentially sensitive biological and cultural resources, and a tribal monitor and archaeological monitor will be present during the field activities.

Contact Information

Jane Hauptman
Agency Name
Los Angeles Department of Water and Power
Job Title
Contact Types
Lead/Public Agency / Parties Undertaking Project


Other Location Info
Owens Dry Lake - South of Lone Pine and North of Olancha.

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
Class 6
Reasons for Exemption
Class 6 consists of basic data collection, research, experimental management, and resource evaluation activities that do not result in a serious or major disturbance to an environmental resource. These may be strictly for information gathering purposes, or as part of a study leading to an action which a public agency has not yet approved, adopted, or funded.
County Clerk


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