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CO0052918
Environmental Health - Public
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CO0052918
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Last modified
7/14/2022 10:51:25 AM
Creation date
3/5/2021 10:16:14 AM
Metadata
Fields
Template:
EHD - Public
ProgramCode
2900 - Site Mitigation Program
RECORD_ID
CO0052918
PE
2900
STREET_NUMBER
0
STREET_NAME
WALNUT GROVE
City
WALNUT GROVE
ENTERED_DATE
11/4/2020 12:00:00 AM
SITE_LOCATION
WALNUT GROVE & OTHERS
RECEIVED_DATE
11/4/2020 12:00:00 AM
P_LOCATION
99
QC Status
Approved
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EHD - Public
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<br />Soil Investigations for Data Collection in the Delta <br />Initial Study/Proposed Mitigated Negative Declaration 13 <br /> <br />*Source: Geoprobe 2019 <br />Figure 6. Track-Mounted Cone Penetrometer Testing Rig <br />2.1.3 On-Land CPT Investigation Methods <br />To conduct a CPT, a cone-tipped rod with a diameter of 1 to 2 inches is pushed through <br />the ground to measure various parameters including tip resistance, side friction, pore <br />pressure, inclination, and shear wave velocity of the soil layers. While advancing the <br />cone, bentonite may be used to reduce friction. The method to perform the deeper <br />CPTs uses an automatic bentonite injection system to keep the friction low on the <br />drilling string, allowing for CPTs of approximately 200 feet deep. The bentonite drilling <br />fluids will be contained and removed from the Impact Area after completion. At various <br />depths, the cone may be stopped, and testing will be performed, including pore <br />pressure dissipation and shear wave velocity testing. During shear wave velocity <br />testing, a source signal is induced in the ground using a small hammer and tapping on a <br />beam pressed against the ground. <br />The duration of CPT investigation activities for the 103 CPTs will be up to 4 days for <br />each Impact Area.
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