Anderson Dam Tunnel Project: Addressing FERC Comments on Monthly Construction Progress Reports

The Santa Clara Valley Water District, in response to Federal Energy Regulatory Commission (FERC) comments on the Anderson Dam Tunnel Project's monthly construction progress reports, has provided detailed justifications for various issues raised. This includes clarifying the reasons behind the "Use As-Is" disposition in Non-Conformance Reports (NCRs) and addressing concerns over concrete compressive strength and daily inspection reports. Valley Water aims to ensure transparency and compliance with FERC's guidelines.

Key Takeaways:

• The Santa Clara Valley Water District has responded to FERC's comments on the Anderson Dam Tunnel Project's monthly construction progress reports, addressing concerns over NCRs, concrete compressive strength, and daily inspection reports.
• FERC had raised issues with the "Use As-Is" disposition in NCRs, where explanations were missing. Valley Water has agreed to provide justifications for this disposition, which will be incorporated into future reports.
• Concerns over concrete compressive strength were raised, but Valley Water argued that the compressive strength of the concrete samples met the design strength of 4,000 psi (per Specification 03300, Table 03300-3).
• An issue with a daily inspection report concerning a PVC membrane was also raised. Valley Water explained that an RFI was not submitted by the Contractor, but a letter was submitted justifying the single weld at T joints.

Statistics:

• 5,000 psi: The design strength of the concrete mix mentioned in the FERC Comment 2, which was incorrectly stated in the lab report.
• 4,000 psi: The actual design strength of the cast-in-place concrete for the North Weir.
• 56 days: The time at which the compressive strength results were taken.
• 90 days: The time at which the compressive strength results were taken.

Sources:

• Federal Energy Regulatory Commission (FERC)
• Santa Clara Valley Water District (Valley Water)
• Specification 03300, Table 03300-3
• Docusign Envelope ID: AF381953-9B29-481B-A475-B1B7B2DC4277