© 2019 by LEE & RO, Inc.

Wastewater &

Stormwater Pump Stations

 

Bitter Point Pump Station

Orange County Sanitation District

Fountain Valley, CA

LEE & RO provided planning, design, and construction phase engineering including startup/commissioning services for a $21 million, 40 mgd pump station located in the City of Newport Beach adjoining the Pacific Coast Highway.  The station has a self-cleaning Ogee Trench wet well and is equipped with five 200 HP WEMCO Hidrostal pumps with VFDs and a 1,250 kW emergency generator.  The project included a new 12kV 1,500 kVA SCE service, switchgear, motor control centers, and related mechanical, control and SCADA systems.  Design and construction challenges included a tight site located in a tidal zone and deep underground construction in soils with high liquefaction potential.  The construction employed a nontraditional “Silent Piling Press-in Method.”  The project required approvals from Caltrans, California Coastal Commission, and many CEQA stakeholders. Bitter Point Pump Station was awarded the ENR Award of Merit in 2012.

 

Pump Station 2 (PS2) Reliability Improvements

City of San Diego

San Diego, CA

PS2 constructed in 1963 and rated at 432 mgd capacity conveys the entire wastewater generated from the San Diego area through two 87-inch dia. force mains to the Point Loma Treatment Plant.  PS2 is equipped with 8 pumps: 6 driven by 2,250 HP motors and 2 by 2,400 HP natural gas engines.  Although PS2 has multiple feeds from SDG&E, PS2 does not meet the EPA Class I Reliability and force main surge protection requirements.  LEE & RO performed in-depth system analysis and designed a $38 million reliability improvement project.  The project included replacement of two engine drives with 2,250 HP motors drives and VFDs; installation of two 3,000 kW natural gas engine driven generators which will be available to pumps at all times for force main surge protection; and installation of two 4,000 kW diesel engine emergency generators.  The project also includes an 8,000 sq. ft. and 45 ft. high building to house the generators, cooling systems, electrical switchgear, and cranes.  The project includes extensive modification to SDG&E power feed and 4.16 kV distribution systems.  New generators and pump sequencing controls will be configured to prevent surge and meet the Class I reliability criteria. Project challenges included permitting with the San Diego County Air Pollution Control District and power feed arrangement with SDG&E. 

 

Rehabilitation of Four Wastewater Pumping Plants (PPs)

Bureau of Engineering (BOE)

City of Los Angeles

Los Angeles, CA

As part of the system-wide wastewater collection system upgrades, LEE & RO has provided condition assessment, preliminary design report, final design and construction support services for $6.5 million rehabilitation of four pumping plants: 5,800 gpm Hawaiian PP 677, 8,000 gpm Wilmington PP 676, 7,400 gpm Fries PP 666, and 18,000 gpm San Pedro Pumping Plant 691.  Each PP required replacement of dry pit submersible pumps, suction and discharge piping and valves, variable frequency drives (VFDs), emergency generator, and automatic transfer switch.  A major component of this project will be temporary sewer bypassing since the construction of this work must be taken place in active pumping plants. The design included temporary pumping facilities and considered critical parts of the electrical system online (i.e. PLC, SCADA, etc.).  The scope included condition assessment of wet wells, piping and structures and electrical systems, SCAQMD permitting of generators, and coordination with the City’s Building and Safety Department for plan checking.

 

Stormwater Management Consulting & Engineering Srvcs.

Mission Bay Development Authority

Catellus Urban Development Corp.

San Francisco, CA

LEE & RO provided stormwater consulting and engineering services for stormwater facilities supporting the multibillion dollar Mission Bay Development in the City of San Francisco.  The LEE & RO engineering assignments included planning, design and construction support services for stormwater collection, pumping, treatment, and disposal facilities. LEE & RO designed four large stormwater pump stations (Pump Station Nos. 1, 4, 5 and 6) with capacities ranging from 50 to 90 cubic feet/second (CFS). The construction cost of each pump station was approximately $7 million.  Stormwater Pump Station 1 (pictured) at the Port of San Francisco Boat Launch Parking Lot Block 21 consisted of 48-inch inlet sewer, CDS stormwater treatment units, pump station, and two 48-inch outfall pipes to the San Francisco Bay. The pump station has five submersible pumps, each rated at 3,000 gpm against 42 feet TDH.  Extensive environmental reviews were performed to obtain approval from the City of San Francisco.  LEE & RO also performed extensive design coordination and reviews with the City and Port, utilities, and other regulatory agencies for facility siting, layout, and design details.

 

“A Street” and “14th Street” Wastewater Pump Stations

Orange County Sanitation District

Fountain Valley, CA

LEE & RO was responsible for station siting, flow measurements, preliminary and final design and construction phase engineering services for the relocation/construction of 1,800 gpm “14th Street” and 800 gpm “A Street” Pump Station located on Balboa Island in the City of Newport Beach.  The construction cost for the two stations was $12 million.  Both stations are equipped with a self-cleaning wet well.   Pumps are dry-pit, submersible Hidrostal pumps, driven through variable frequency drives.  The unique engineering challenges included public outreach, hydraulic complexity and pump selection, obtaining the permit from the California Coastal Commission, tight construction sites with high groundwater in a tidal zone, and architectural blending of the two stations with the surrounding commercial and residential neighborhoods.  (Pictured “A Street” Pump Station Architecture)

Kifer Lift Station Upgrades

City of Sunnyvale

Sunnyvale, CA

LEE & RO prepared the preliminary design report, plans & specifications, and provided construction support and permit acquisition services for a 450 gpm wastewater pump station, which included conversion of an existing Smith & Loveless package station to a new submersible facility.  The new pump station consisted of two 450 gpm submersible pumps (at TDH of 22 feet) driven by 5-horsepower motors, new electrical controls and sensors, and conversion of the existing dry-pit portion of the pump station to a new wet well.

 

New York Creek Lift Station

El Dorado Irrigation District

Placerville, CA

 

Prepared design report, plans and specifications, and provided construction phase engineering services for a wastewater pump station located in El Dorado Hills.  The station constructed in 1983 included a wet well with two submersible pumps, an emergency generator with fuel tank, an abandoned chemical storage building, and a surge arrestor tank. This $1.4 million project increased the pumping capacity to 1,600 gpm against 186 feet TDH by installing three new 800 gpm pumps, a T-lock lined concrete wet well, 200 kW emergency generator, a surge control tank, and a granular activated carbon odor control scrubber.  Work also included incoming sewers, force main, new motor control center, PLC-based pump controls, and various site improvements.

Pump Station 65 (PS65) Upgrades

City of San Diego

San Diego, CA

 

PS65 is equipped with two sets of vertical centrifugal pumps, two 150 HP pumps, and two 400 HP pumps.  This $5 million project was to increase the station capacity and improve reliability.  The 400-hp pumps will be upgraded to 500 HP pumps with new motors and impellers.  A third new 500-hp pump was installed to serve as a standby.  The electrical upgrades included replacement of the soft starters with VFDs, new control devices, and SDG&E transformer.  Aside from the capacity upgrade, the existing wet well was modified to a self-cleaning wet well.  Physical hydraulic modeling was performed to determine what modifications to the wet well and suction piping were necessary to optimize the operating conditions and to assure that any modifications to the existing layout will deliver uniform flows to the pumps and effectively self-clean the wet well. 

Wastewater Pumping Station 45 (PS45)

Trunk Sewers and Force Mains

City of San Diego

San Diego, CA

 

LEE & RO provided planning, design and construction support services a $11.9 million PS45 project.  The City operated three antiquated pump stations (PS28, 29, and 45) serving the La Jolla, UC S an Diego and Torrey Pines Golf Course Areas.  PS45 is located at the low point within the three stations’ drainage areas.   LEE & RO successfully developed a plan for combining PS28, 29, and 45 into a new station at the vicinity of PS45 site.  The project required flow modeling of the tributary areas of all three stations for build-out in Year 2050.   The constructed project included 10,000 feet of 24 in. dia. trunk sewers and HDPE and DI iron force mains to divert flows.  The depths of sewers and force mains are between 8 to 25 feet.  New PS45 is equipped with two 1,990 gpm pumps (@ TDH of 290 feet), each driven by a 200 hp motor through a variable frequency drive.  Portions of trunk sewers and force mains  were micro-tunneled.  The project sites were in an affluent community of La Jolla near the shoreline and extensive environmental reviews were necessary to obtain the California Coastal Commission permit. 

San Juan Creek Lift Station

Santa Margarita Water District

Las Flores, CA

 

LEE & RO provided planning, design and construction support services for a new $4 million sewer pump station conveying wastewater from the new community of Ladera Ranch to the Chiquita Water Reclamation Plant.   The station has a capacity of 7,500 gpm at TDH of 180 feet and equipped with four 150-hp, 2,500 gpm dry pit submersible pumps, driven through variable frequency drives.  The project included a new building to house the pumps, switchgear and MCC, instrumentation, and an emergency generator with fuel tank outside.  The project included 16-inch dia. 7,800 foot long force main, 1,300 feet long 15-inch dia. sewer and 8,200 feet long 16-inch dia. nondomestic water line from the Reclamation Plant to the lift station.  The pipeline alignments involved crossing of the San Juan Creek and working with steep slopes and erosion protection issues.

Sewer Pump Station 13 (PS13) Rehabilitation

City of San Diego 

San Diego, CA

 

PS 13, constructed in 1963, consisted of two 117 gpm drywell pumps (TDH 60 feet) driven by a 10 HP motor.  PS13 receives wastewater from a comfort station near the beach causing sand to accumulate in the wetwell, an enclosed concrete vault (confined space) located inside the drywell.  The project was to replace the pumps and modify the wetwell such that it does not create confined space issues.  Improvements included the extension of the wetwell outer wall to the top slab, reconfiguration of the top slab to include access manholes to the wetwell and drywell, reconfiguration of the suction and discharge piping, installation of a davit crane on the top slab to perform maintenance and pull the pumps and motors, replacement of ventilation system, construction of a sand trap upstream of the pump station inlet, and new electrical and control systems for remote monitoring and operation.  This $750,000 project received “Outstanding Project of the Year” award from APWA.

Condition Assessment and Evaluation of Moss Avenue

Pump Station (MAPS)

City of Santa Monica

Santa Monica, CA

 

MAPS is a 26 mgd capacity wastewater pump station conveying raw sewage into the Coastal Interceptor Sewer (CIS) owned by the City of Los Angeles.  MAPS is located right next to the Santa Monica Beach Pier and must be operational at all times and comply with EPA Class I Criteria.  MAPS expected to receive more flow from the Santa Monica Bay Dry Weather (Low Flow) Diversion projects.  In addition, the CIS, which is expected to reach at maximum capacity within two years, impacts the MAPS force main capacity.  LEE & RO to performed in depth facility condition and functional assessment of mechanical, electrical, instrumentation & controls and SCADA, structural, wear and tear, corrosion, and odor control, and prepared a preliminary engineering report summarizing the results of assessment, future capacity needs, hydraulic analysis, and recommended capital improvement projects.