The Lift Station 55-11 project (Project) will consist of improvement upgrades of the existing Lift Station 55-11 site. LS 55-11 was built approximately 30 years ago, is deteriorating, and is in need of replacement. The facility has been identified as highly vulnerable to failure and sanitary service interruptions, potentially causing public health concerns and environmental impacts through sanitary overflow. Improvements will bring the facility into compliance with CVWD standard design requirements. The improvements will ensure a continuation of sanitation services to existing customers while providing an emergency response inflow capacity, in the event of stormwater events or other unanticipated inflow increases. The Project includes the following improvement upgrades within the existing Lift Station 55-11 site:
• Installation of a new wet well to provide pumping storage capacity of 16,547 gallons. Current Capacity is 0 gallons.
• The replacement of two existing pumps (each 50 horsepower (hp); 1,540 gallon per minute (gpm)) with two new pumps (each 100 hp; 1,870 gpm). The firm pumping capacity will increase from 1,540 gpm to 1,870 gpm.
• Re-purposing the the existing wet well for back-up pumping during emergencies. The new emergency pumping capacity will be 1,540 gpm.
• Installation of one new biofilter for odor control to meet CVWD’s sanitation standards. The odor control bed will be located to the north of the wet well.
• Replace the existing generator, 100 kilo-Watt (kW), with a new one at 450 kW.
• Install one pre-fabricated building to house electrical equipment (MCC and control equipment).
• Replace existing MCC (225 Amps) with new one at 600 Amps.
The existing wet well to be re-purposed is 10-feet diameter and 17.7 feet deep. The new wet well will be 16 feet in diameter and 32 feet deep. The project will include site improvements to add site piping, paved access driveways, perimeter fencing, and lighting. The upgrades to the existing Lift Station 55-11 facility is anticipated to begin in February of 2024 and is anticipated to take place over 532 calendar days. The
urrounding land uses consist of residential, farmland, open space, and roadways. The existing lift station will continue to convey wastewater while the upgrades are under construction causing no disruptions in services. The Project is not located within or adjacent to a conservation area associated with the Coachella Valley Multiple Species Habitat Conservation Plan (CVMSHCP). The sites are not subject to the CVMSHCP development mitigation fee because the sites were previously developed.