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DC Decision Construction LADWP Specifications · Spec No. 104
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Utility Services · LADWP Specification No. 104 · Rev 11/07/2025

Underground conduit & substructures, made searchable.

A working knowledge base for LADWP Specification No. 104 — the rules your trench, conduit, vaults, and inspections are held to. Switch between the simplified field summary and the full detail view, search any requirement, or print the whole thing for the crew.

Reading key defined term — hover for definition Std Dwg / ASTM — standard reference 24" — critical measurement match — search hit

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Reference PDFs ↗ Meter Panel Spec ↗ Conduit Information ↗ Rear to Front Line Conduit ↗ Lead Plug Dead End ↗ PP Rebuild Guidelines
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SPEC No. 104
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ENGINEERING REFERENCE — MANDREL TEST · §3.4.4
NOT FOR CONSTRUCTION
ENGINEERING REFERENCE — TRENCH SECTION · §5.3
NOT FOR CONSTRUCTION
ENGINEERING REFERENCE — PRECAST VAULT SECTION · §6.5
NOT FOR CONSTRUCTION
ENGINEERING REFERENCE — VENT LAYOUT · §7
NOT FOR CONSTRUCTION
ENGINEERING REFERENCE — ENCASED DUCT BANK · §9.6
NOT FOR CONSTRUCTION
ENGINEERING REFERENCE — BELL & SPIGOT JOINT · APP I §3
NOT FOR CONSTRUCTION
ENGINEERING REFERENCE — MINIMUM COVER BY LOCATION · APP II TABLE 2
NOT FOR CONSTRUCTION

Spec 104 is 500+ pages of ways to fail an inspection. We pass them daily.

From mandrel tests to encasement mixes to as-builts — our crews build to this spec on Palisades parcels every week. Hand it to us before the redlines find you.

Talk to a spec-fluent team
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DC Decision Construction — LADWP Spec No. 104 Field Guide ({{ viewLabel }})

PRINTED {{ printedDate }} · UNDERGROUND CONDUIT & SUBSTRUCTURES · REV 11/07/2025 · PREPARED VIA DECISIONCONSTRUCTION.COM ·

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DECISION CONSTRUCTION · 15223 LA CRUZ, PACIFIC PALISADES, CA 90272 · DECISIONCONSTRUCTION.COM — SUMMARY FOR FIELD REFERENCE; THE PUBLISHED SPECIFICATION GOVERNS.