(A) Capacity. The design capacity for a lift station shall be designed to a reasonable capacity based on similar flows from comparable zoned areas.
(1) The designer shall provide a table in the design report for the design capacity for each non-residential lot.
(2) Multi-family lots with a four-plex or greater are also considered commercial lots.
(3) (a) During the building review process, a letter from an engineer must be submitted certifying that the sewer capacity is not greater than the original design capacity of the lot.
(b) If the capacity for the building is greater, additional capacity may be required.
(B) Building. The building shall be constructed of masonry block or similar high durability construction material.
(1) The building style must be compatible with the surrounding environment.
(2) The developer must install and provide access to the building so maintenance equipment can access the building and wet well.
(C) Landscaping. All lift stations must have low water/native vegetation and trees for the landscape screening with an irrigation system
(D) Fencing.
(1) All lift stations must be fenced with an eight foot high black vinyl coated chain link fence with two-strand barbed wire top.
(2) A minimum of two lockable gates must be provided; one for pedestrian access and one double gate that is able to swing 180° for allowing maintenance equipment to access the site.
(E) Wet well. Must be lined with a PVC coating or approved equal by the Public Works Department.
(F) Piping.
(1) (a) All piping must be stainless steel within the wet well and ductile iron in the building.
(b) The pipe must also be configured to accommodate bypass pumping with a blind flanged tee after the last check valve.
(2) (a) All fittings must be located out from under the lift station slab or located within a grated trench.
(b) All fittings must be accessible without damaging the building.
(G) Valving.
(1) All check valves must have external levers.
(2) A three-way Dezerik plug valve must be installed at the point the two pumping lines join.
(H) Safety.
(1) The wet well shall have a safety grate that is easily removable and integral to the hatch.
(a) The grate must be rated to at least 1,000 pound of loading.
(b) In addition to the hatch with a safety grate, removable handrails must also be supplied.
(2) (a) A compressor and two full-face masks with a minimum 50-foot hoses will be required for a fresh air supply.
(b) SCBA will not be acceptable as a fresh air supply.
(I) Pumps. The pumps shall be Gorman-Rupp, Paco, Flyght or equal as approved by the PWD.
(J) Telemetry.
(1) The telemetry must be designed in accordance with the city telemetry design standards.
(2) If no standards exist, coordinate with the PWD.
(K) Pigging stations. Any lift station with a force main of more than 2,000 feet that does not have an existing flow of 50% of the design capacity, must have pigging stations for cleaning of the force main.
(L) Odor control. All vents from the wet well or force main must have a carbon filter.
(M) On-site generator. All lift stations must be supplied with an on-site generator.
(1) The generator must be a natural gas or diesel fuel unit located in a separate room within the building.
(2) An access door big enough to remove the generator for maintenance will be required.
(Prior Code, § 11.05.030.040) (Ord. 2019-9, passed 9-3-2019; Ord. 2021-15, passed 12-20-2021)