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Personnel access to the wetwell shall be by means of a 36-inch-by-36-inch (minimum size) lockable aluminum hatch and aluminum ladder, with grab bars suitably located. The ladder shall have nonskid rungs and shall extend down to the grating level. Another ladder shall be provided to reach the bottom of the wetwell from the grating level if the elevation difference exceeds three feet. See WSSC Standard Detail M/15.0 for grab bar details and M/16.0 for ladder details. Removal and reinsertion of pumps shall be through the personnel access hatch when possible. Separate hatches for equipment removal shall be provided for each pump if warranted by the external dimensions of the pump.

The access hatch covers shall be watertight and set flush with the top of the roof slab. Hatches and hatch door requirements shall be as detailed in WSSC Standard Specifications for hatches and hatch doors for vaults, Section 05500, subsection II. In addition, padlocking provisions must be provided to allow the hatch to be securely locked.

Drain lines shall be provided from the drain fitting at the hatch(es) to an elevation below the grating level.

Removable bollards and chains shall be provided around the access hatch for safety when performing maintenance around the pumps and other equipment. (Design Guideline DG-08 § 5.3, dated August 2006)