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Incoming RFI — From Walsh Construction
#0234
April 28, 2026
May 5, 2026
URGENT
Walsh Construction — Dave Park, Supt.
Crestline CM — Eduardo Martinez
03.30.00
Station C — Retaining Wall Footings
QUESTION FROM CONTRACTOR:
"Please clarify the concrete compressive strength requirement for the retaining wall footings at Station C. The structural drawings (Sheet S-14, Detail 4/S-14) indicate f'c = 4,000 psi for all footing elements. However, Specification Section 03.30.00, Paragraph 2.1.3 specifically calls for f'c = 5,000 psi for all below-grade structural concrete applications. The two documents conflict. Which governs, and is there a cost/schedule impact?"
Spec Reference — Section 03.30.00, Para 2.1.3
"All below-grade structural concrete, including but not limited to footings, pile caps, grade beams, and retaining walls, shall achieve a minimum compressive strength of f'c = 5,000 psi at 28 days. This requirement supersedes any drawings notation that may indicate a lesser strength for below-grade elements."
Drawing Reference — Sheet S-14, Detail 4/S-14
"Retaining Wall Footing — f'c = 4000 psi, 3" clear cover, #8 @ 12" E.W. bottom mat. See schedule for reinforcement details."
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RFI RESPONSE — #0234
Metro Blue Line Phase 3 QA/QC Program · Contract No. PSA-24-3182 · Crestline Construction Management