# Detail or Installation Mismatch in Division 33 Utilities submittals

> Source: https://deviationcheck.com/divisions/33-utilities/detail-installation-mismatch/

The submitted detail, dimension, anchorage, or installation method differs from what the spec or drawings require.

## What to look for in Division 33 Utilities

- **Pipe bedding class** differs from spec (e.g., Class B specified, submittal shows Class D native material backfill - significant structural difference)
- **Trench width** differs from pipe OD plus required clearance (typically 12-18" each side for pipe diameter up to 24")
- **Manhole spacing** exceeds local sewer standard maximum (typically 400-500 ft for gravity sewer; more frequent access required for smaller pipes)
- **Drop manhole connection** (outside drop vs inside drop) differs from spec where elevation difference requires energy dissipation
- **Service lateral slope** below code minimum - 1/4" per foot (2%) for gravity sewer laterals
- **Pipe cover depth** - minimum cover above pipe crown varies by load condition; highway loading typically requires 2 ft minimum cover for flexible pipe
- **Thrust block sizing and location** at horizontal bends, tees, and dead ends - must resist unbalanced hydraulic force; size depends on pipe diameter, pressure, and soil bearing capacity
- **Restrained joint length** at fittings where thrust block is not used - number of restrained pipe lengths differs from design
- **Valve box placement** must be centered over valve operating nut and plumb - misalignment prevents operation with standard wrench
- **Tracer wire** continuity and access box placement for non-metallic pipe (PVC, HDPE) - required for pipe locating

## Severity

Default grade: Fix and Resubmit. Escalates to Blocker when the difference affects a fire-rated, seismic, or structural assembly.