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T15 Upper Feather River Dams Fault Exploration, Indian Creek Fault (ICF)

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Contract Overview

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A geologic investigation is planned at T-15, a trench site on the Indian Creek Fault near Antelope Lake in the Mt. Hough Ranger District of California, to assess historical tectonic activity that may impact the long-term safety of Antelope Dam. The study aims to define the location and past behavior of the Indian Creek Fault approximately six miles upstream of the dam along Indian Creek through controlled excavation and subsurface analysis. Prior to trenching, preliminary subsurface exploration will be conducted using hand augers or post-hole tools to gather stratigraphic data, with all removed soil carefully retained on tarps and subsequently backfilled to restore the original ground conditions. The project is led by the California Department of Water Resources, with Leah Feigelson serving as the primary point of contact for engineering geology matters. The initiative is scheduled for execution in 2026, with the goal of informing dam safety evaluations based on refined understanding of regional fault history.

General Info

Geologic trenching at Indian Creek Fault to assess seismic risk to Antelope Dam, planned for 2026.

Agency

California Water Resources, Department of

NAICS

541360 - Geophysical Surveying and Mapping ServicesView NAICS

Place of Performance

CA

Set-Aside

NONE

Documents

(1)

T15 Upper Feather River Dams Fault Exploration Notice of Exemption

PDF•notice-of-exemption

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Timeline

PostedJun 4

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Organization & Contact Information

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AgencyCalifornia Water Resources, Department of

Contacts1 person available

OfficeN/A

Organization / Agency

California Water Resources, Department of

Office AddressN/A

Contacts

Leah FeigelsonProject Geology Engineering Geologist

contact@example.gov

+1 (555) 000-0000

Full Description

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To evaluate past tectonic activity that could influence dam safety at Antelope Lake in the future one trench sites (T-15) on the ICF near Antelope Lake in the Mt. Hough Ranger District. T-15 will be excavated and studied to better define the location and history of the ICF approximately 6 miles upstream of Antelope Dam along Indian Creek. Preliminary subsurface geologic exploration at the ICF sites will take place prior to excavation. A hand auger or post-hole tool will be used to dig into the ground and then backfilled with the same soil. Tarps will be used to place the soil on temporarily until backfilling.

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