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Example Confined Space Entry Programs
Use with the Confined Spaces book, Chapter 296-809 WAC

These example confined space entry programs are provided for your information, and to help you determine the information needed for your program.

To develop an effective program for your facility or work environment, you will need to identify work conditions both typical to your industry and uniqueto your workplace. You also need to consider other rules. For a list of rules in other chapters that cover confined spaces, see the Resources section of the Confined Spaces book.

Example Confined Space Entry Program for

Sewer Entry

The sections that follow apply only to permit-required confined space entry. The information on alternate entry has been identified with a title.POTENTIAL HAZARDS
Check the boxes after you have reviewed your workplace for these hazards.

Employees could be exposed to the following:
❑ Engulfment and drowning
❑ Presence of toxic gases
Equal to or more than 10 ppm hydrogen sulfide measured as an eight-hour time-weighted average. If the presence of other toxic contaminants is suspected, specific monitoring programs will be developed.❑ Presence of explosive/flammable gases
Equal to or greater than ten percent of the lower flammable limit (LFL)
❑ Oxygen deficiency
A concentration of oxygen in the atmosphere equal to or less than 19.5% by volume.


Review the information in this section.

• All sewers are considered permit-required confined spaces until the pre-entry procedures demonstrateotherwise.

• Any employee required or permitted to pre-check or enter a sewer has successfully completed, at a minimum, the training outlined in our training procedures.

• A written copy of operating and rescue procedures as required by these procedures is at the worksite for the duration of the job.

• The sewer entry permit is completed before approval can be given to enter a sewer.• The permit verifies completion of items required to protect employees.

• The permit is kept at the job site for the duration of the job.

• If circumstances cause an interruption in the work or a change in the alarm conditions for which entry was approved, a new sewer entry permit needs to be completed.

Review the information in thissection.


• The surrounding area is surveyed to avoid hazards such as drifting vapors from tanks, piping, or sewers.


• The sewer atmosphere is tested to determine whether dangerous air contamination or oxygen deficiency exists.
• A direct reading gas monitor is used.
• Testing is performed by a supervisor who has successfully completed the gas detectortraining for the monitoring method used.
• The minimum parameters to be monitored are oxygen deficiency, Lower Flammable Level (LFL), and hydrogen sulfide concentration.
• A written record of the pre-entry test results is made and kept at the worksite for the duration of the job.
• Affected employees are able to review the testing results.
• The most hazardous conditions will determine whenwork is being performed in two adjoining, connected spaces.

Space ventilation

• Mechanical ventilation systems, where required, are set at one hundred percent of the outside air.
• Where possible, open additional manholes to increase air circulation.
• Use portable blowers to increase natural circulation if needed.
• After a suitable ventilation period, repeat the testing.
• Entrymay not begin until testing has demonstrated that the hazardous atmosphere has been eliminated or controlled.


Review the information in this section.

Table HT-1
Entry Procedures for Confined Space Conditions

|If you have any of the following conditions |Then follow these procedures |
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