California Aqueduct Pool 20 and Pool 21 Geotechnical Exploration

California Aqueduct Pool 20 and Pool 21 Geotechnical Exploration

Up to 106 cone penetration testing (CPT) soundings will be drilled; 102 of these will go to a depth of 30 feet and the remaining 4 will go to about 115 feet vertically. Fifty-three hollow stem auger (HSA) drill holes will be drilled to a depth of about 30 feet from the Aqueduct embankment crown. The purpose of this drilling is to assess the subsurface conditions of the Aqueduct embankment fill and underlying foundation materials in the area, and to gather samples for index testing of soils encountered. The drill hole depths will allow DWR's Project Geology to characterize the embankment and foundation soils and to collect undisturbed soil samples for index and strength testing. Backhoe, hand auger, or hand-dug pits will be performed to obtain bulk samples of the proposed borrow materials. In select locations in the project area, HSA drill holes, about 10 feet deep, will also be used to obtain bulk samples for laboratory testing. A maximum of three sampling locations per acre will be performed; the proposed borrow acres is approximately 104 acres. If the borrow location is about the width of a road, sampling will be performed approximately every 1,000 feet. These sampling locations will generally be random. State Water Project users will benefit.

Fresno, Kings