Rule 15-18-77-5.3.2 - General1. Pump chambers shall have a storage volume as required per each system type, for subsurface drip, overland disposal and spray systems. Pump chambers for septic tank systems shall be a minimum of 400 gallons.2. The pump chamber shall be constructed to withstand normally encountered earth pressures and manufactured with approved materials resistant to the corrosive effects of wastewater, common household chemicals and chemicals used for disinfection. 3. The pump chamber shall be equipped with an audible high water alarm.4. The pump chamber shall have a grade level access large enough to allow servicing and/or removal of the largest component in the chamber. Access ports shall be protected against unauthorized entrance. 5. The pump chamber shall be vented through the grade level access or by means of a separate vent. In either case the vent shall be a minimum of one inch in diameter.6. All openings shall be sealed with a mastic, butyl rubber or other pliable sealant that is waterproof, corrosion resistant and approved for use in contact with wastewater and chemicals used for disinfection, in a manner to prevent the entrance of surface and groundwater.7. When pumping to normally gravity fed systems the use of a stilling chamber (baffled distribution box) shall be required. The stilling chamber must be sized larger than the maximum volume pumped in a single dose so as not to flood the chamber. 8. The stilling chamber shall be constructed and placed so it will drain between doses into the treatment and/or disposal site.15 Miss. Code. R. 18-77-5.3.2