13.20.440 Dosing chamber, pump pit, wet well, or lift station.
If dosing chambers, pump pits, wet wells, or lift stations are used, items A. to D. apply:
A. The dosing chamber shall meet or exceed the requirements of Chapter 7, Sections 1 and 3, and be vented. Dosing chambers shall be setback as specified in Table 1. A tank’s final cover shall be crowned or sloped to shed surface water. Dosing chambers shall not be placed in floodplains;
B. The dosing chamber shall either include:
1. An automatic siphon or pump with level control switches and an alarm system; or
2. Have a minimum total capacity of 500 gallons or 100% of the average design flow, whichever is greater;
C. The inlet of pumps shall be elevated at least 4 inches from the bottom of the dosing chamber, or protected in some other manner to prevent the pump from drawing excessive settled solids. The pump, pump controls, and pump discharge line shall be installed to allow access for servicing without entering the dosing chamber; and
D. Electrical installations shall comply with applicable laws and ordinances, including the latest codes, rules, and regulations of public authorities having jurisdiction.