News Annoucements

The Latest News

JULY 2022

City of Riverside Awards LEE + RO a Contract to Upgrade and Replace the Area-Velocity Type Flow Meters at Three Influent Trunk Sewers

The City of Riverside Regional Water Quality Control Plant (RWQCP) has five (5) influent sewers. The Acorn, Arlanza, and Santa Ana sewers are currently equipped with area-velocity type flow meters. The Rubidoux and Jurupa sewers are equipped with more accurate electromagnetic flow meters (mag meters).

The City of Riverside Public Works Department (City) has contracted LEE + RO to upgrade and replace the area-velocity type flow meters with mag meters on the Acorn, Arlanza, and Santa Ana influent trunk sewers to obtain more accurate and reliable flow measurements at the RWQCP.

LEE + RO’s scope of services includes conducting an assessment study, updating a 2014 Preliminary Design Report (PDR) including verifying design flow rates, hydraulic calculations, design criteria, and meter sizing, providing comprehensive final design plans, specifications, and estimates in accordance with the approved PDR update, bid phase support services, and engineering services during construction.

The minimum recommended mag meter sizes are 10-inches for the Acorn influent sewer, and 28-inches for the Arlanza and Santa Ana influent sewers. The configuration of the metering facilities will include an influent diversion structure, a meter vault that protects the meter, an outlet diversion structure, and a bypass pipeline.

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JUNE 2022

City of El Centro Contracts LEE + RO to provide Design Services for Stormwater Trash Capture

The City of El Centro (City), as a permittee of the State Water Board's Municipal Separate Storm Sewer Systems (MS4) permit, is required by the State Water Board to comply with stormwater trash provisions. The goal of these provisions is that trash shall not be present in ocean waters, along shorelines or adjacent areas in amounts that adversely affect beneficial uses or cause nuisance. These trash reduction strategies are grouped into two compliance options; Track 1, which refers to Certified Full Capture Systems (FCS), and Track 2, which refers to any combination of structural, institutional, or non-institutional controls of trash.

The City selected the Track 1 compliance method as the preferred means to comply with the Board’s Trash Amendment Resolution. As such, the City will install, operate and maintain State-Certified Full Capture Systems (FCS) for capturing trash from storm drain pipes and drains from Priority Land Uses such as commercial, industrial and high density residential uses. A trash FCS is defined as a single device (or a series of devices) that traps all particles that are 5 mm or greater, and has a treatment capacity that is either not less than the peak flow rate resulting from a one-year, one-hour storm in the subdrainage area, or appropriately sized to carry at least the same flow as the corresponding storm drain.

The design of the FCS will be based on the use of Continuous Deflective Separator (CDS) units at storm drain outfalls and drain inlet filters for catch basins and grate inlets. CDS units capture a very wide range of organic and in-organic solids and pollutants such as total suspended solids (TSS) and other sedimentitious materials, oils and greases, trash, and other debris, including floatables, neutrally buoyant, and negatively buoyant debris. The CDS unit is a non-mechanical self-operating system that functions any time that there is flow in the storm drainage system.

LEE + RO’s scope of services includes project management, performing site investigations with the City, attending design review meetings, preparing a preliminary technical memorandum complete with assessments and recommendations that will serve as the basis of design for preparing 60% design documents followed by final bid documents (plans, specs and estimates).

El Centro 1207-03 Combined Photo Resized Compressed
MAY 2022

Santa Clarita Valley Water Agency Selects LEE + RO to Provide Technical/Engineering Evaluation and Design Services

LEE + RO is providing the Santa Clarita Valley Water Agency (Agency) with engineering services for an evaluation of replacement options, and preparation of the preliminary and final design for the replacement of an underground storage tank at its Rio Vista Water Treatment Plant (RVWTP). The existing 8,000-gallon Underground Storage Tank (UST) provides diesel fuel for the RVWTP Emergency Standby Generator. The replacement tank will be of similar size but will be an Aboveground Storage Tank (AST).

LEE + RO evaluated replacement options, including installation of a new AST, a new 100-gallon fuel Simplex Day tank installed inside the existing engine generator room, as well as evaluation of the current permitting and regulatory requirements, and the constructability issues for the UST replacement.

LEE + RO’s scope of services includes:

UST Replacement Evaluation and Preliminary Design Technical Memorandum
This task included site investigation and obtaining/reviewing existing record drawings, operations, and maintenance information, permit information, and discussions with SCVWA staff on the current UST facility, day tank, and standby generator system. LEE + RO:

  • Evaluated the current technical, Code, and regulatory requirements applicable for the current UST installation and the replacement tank
  • Coordinated with the City, County, and State regulatory agencies, including Los Angeles County Fire Department, South Coast Air Quality Management District, and the Los Angeles County Department of Public Health for the items impacting the UST replacement
  • Defined all permit requirements and permit timelines applicable to the project
  • Evaluated cost benefits for the applicable replacement options and provided recommendations for the replacement
  • Evaluated temporary facilities necessary to install the replacement system
  • Submitted a Technical Memorandum with recommendations summarizing findings, providing preliminary layout drawings, equipment performance specifications, construction cost estimate, and construction schedule

3D Architectural Rendering Presentation
This task included preparation of three-dimensional (3D) renderings of the project for presentation to the SCVWA Engineering and Operations Committee, illustrating the UST Replacement project and its construction sequencing and staging.

Final Design, Project Management, and Contract Documents
LEE + RO will provide the final design for the UST replacement system, that includes:

  • Above Ground Storage Tank (8,000 Gal)
  • Day Tank (100 Gal)
  • Containment Structure of a 4-foot high or higher wall to hold 8,000 gallons complete with stairs and railings
  • Evaluation of the use of agricultural-grade R99 alternative fuel for the backup generator
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April 2022

LEE + RO to provide Goleta Water District with Assessment of Seven Emergency Generators

Goleta Water District (GWD) has seven different facilities equipped with stationary diesel-fueled emergency power generators ranging in size from 16 kW up to 750 kW. GWD issued a task order to LEE + RO to evaluate and perform a condition assessment on these generators and provide prioritized recommendations for repairs or replacement to avert potential future failures.

The scope of work includes:

  • Site visits to gather information on the existing generators and installed conditions. Based on the gathered information, the initial assessment will consider:
    1. Failure History and Causes
    2. Aging (number of years the generator has been in-service)
    3. Annual Maintenance Routines
    4. Parts and Service Availability
    5. Current Loading
    6. Planned Future Loading
  • Present the initial assessment to discuss the findings and determine the direction forward for each of the seven generators.
  • Final Assessment Report. This report will include an assessment for each of the existing generators, repair or replacement recommendations, prioritization of the work, and associated preliminary cost estimates.
Goleta Emergency Generator NEWS Photo tinified
March 2022

Sunset Beach Sanitary District Contracts LEE + RO to Design a Sewer Bypass

District to retire the existing Broadway Sewer Pump Station

Sunset Beach Sanitary District (District) wishes to abandon the existing Broadway Sewer Pumping Station to eliminate their single largest sewage spill risk, a risk that has been recently exacerbated by climate change impacts. Based on LEE + RO’s experience in the design and construction support for sewer systems, and previous experience with District projects, Sunset Beach Sanitary District has contracted LEE + RO to prepare a comprehensive project report, including a preliminary design, for a 3,300 LF, 15-inch diameter bypass sewer main located alongside the Sunset Beach Greenbelt (Linear Park) in N Pacific Avenue. The bypass sewer will redirect the pump station influent flows to the City of Huntington Beach’s existing Warner Avenue Gravity Sewer near the intersection of Warner Ave. and Pacific Coast Highway. One of the main objectives of the project report is to satisfy requirements for potential award of available grant funding. The report includes an analysis of pipeline alignments, materials of construction, as well as construction methods and techniques.

LEE+RO’s design services include:

  • Review the tie-in invert elevations for the connecting sewer mains to confirm project feasibility.
  • Evaluate and verify design flows presented in the feasibility report for pipe sizing.
  • Confirm the 15-inch diameter pipe sizing after calculating the tributary flows based on the buildout of the vacant tributary areas.
  • Review permitting requirements and assist the District with all necessary permit applications.
  • Identify and present alternative pipeline alignments through available utility corridors.
  • Consider and evaluate alternative construction techniques such as horizontal directional drilling, micro-tunneling, and pipe bursting.
  • Prepare preliminary full scale plan and profile drawings and preliminary traffic control plans for the preferred alignment alternative.
  • Prepare environmental compliance support documentation.
  • Assist the District in identifying funding sources and preparation of grant and loan applications. A financial plan for proceeding without grant assistance will also be developed.

With the abandonment of the existing Broadway Sewer Pump Station, the District not only eliminates their single largest sewage spill risk, but also realizes a net positive impact for the environment.

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March 2022

LEE + RO to Upgrade Electrical Gear of Goleta Water District’s Hollister Recycled Water Booster Pump Station

Goleta Water District’s (GWD) Hollister Booster Pump Station (BPS) is an underground facility that is part of the GWD’s recycled water system. An Arc Flash Study had recommended that the main switchboard/MCC and VFD/PLC be replaced in their entirety.

At that time, GWD was expecting to relocate the entire BPS due to a conflicting City of Goleta Road Improvement Project. However, the City postponed their project and GWD is interested in replacing the electrical gear as recommended in the original Arc Flash report to eliminate as many worker safety hazards as possible.

Because the District anticipates having to eventually relocate the BPS, this task order project provides a preliminary design for the electrical gear replacement and an evaluation for its potential relocation and reuse at the new BPS future location.

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January 2022

City of Riverside Contracts LEE + RO to Assess the Operational Challenges at the Pierce Street Wastewater Pump Station

The Pierce Street Pump Station is the largest wastewater lift station in the City of Riverside. It handles on average 4.5 MGD and is currently experiencing operational challenges. Issues include non-operational valves, leakage from the wet well into the dry well, aging mechanical equipment, and outdated electrical components.

LEE + RO has been contracted by the City’s Public Works Department to assess current conditions and remaining service life of the mechanical equipment and electrical components and recommend modifications and/or replacements. LEE + RO will review existing records, perform site visits, and conduct interviews with City operations and maintenance staff to not only identify issues but also to gain insight into fully understanding issues observed. Findings will be presented in an Assessment Report summarizing solution alternatives, complete with recommended improvements.

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November 2021

Elsinore Valley Municipal Water District Contracts LEE + RO for Broad-Based Condition Assessment

Evaluating Motor Control Centers and Pump Control Panels for 123 Facilities

LEE + RO is providing Elsinore Valley Municipal Water District (EVMWD) with engineering services for inspection, evaluation, and condition assessment of the Motor Control Centers (MCC) and Pump Control Panels at 123 EVMWD facilities. To assess and address the capacity, reliability, growth, and regulatory needs of EVMWD’s facilities, LEE + RO will develop an inventory of existing facility electrical assets, and a priority list for replacement, and identify the availability of replacement parts or complete replacement of units.

Task 1 - Data Collection and Review

LEE + RO will:

  • Develop a list of required information for each facility and collect, and analyze available documentation
  • Catalog which “critical” documents or information is missing and will summarize the available information in a Technical Memorandum
  • For facilities where one-line diagrams are not available, LEE + RO will collect the necessary data through field visits and generate new detailed one-line diagrams

Task 2 – Field Investigation Plan

Based on the original available data review, LEE + RO will:

  • Develop and submit a Field Investigation Plan in Technical Memorandum format for EVMWD to review.
    • The investigation plan will describe the overall investigation objectives, provide a description of each facility and the proposed investigatory methods, testing, and procedures (including staffing and safety considerations).
  • Upon EVMWD approval of the Field Investigation Plan, LEE + RO will initiate the field investigation work.

Task 3 – Perform Condition Assessment

LEE + RO personnel will visit each facility, along with EVMWD’s staff, to collect inventory data and perform a detailed condition assessment.

  • MCC & Pump Control Panel testing, and documentation includes:
    • Current draw on motors
    • Grounding system visual inspection and resistance testing
    • Motor megger testing
    • Infrared thermographic scanning
    • Rodent abatement measures and recommendations
    • Document physical damage or life safety issues, including Code compliance issues
    • Catalog existing controls hardware and equipment and provide recommendations for replacement and standardization

Task 4 – Prepare Condition Assessment Reports

LEE + RO will prepare a Condition Assessment Report that includes:

  • Field investigation results
  • Identification of site issues
  • Recommendations for repairs and/or upgrades
  • Planning level costs for each recommended repair or improvement
  • Prioritization of the recommended improvements
  • Identification of estimated remaining useful life of a site if repairs and/or upgrades are performed
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October 2021

West County Wastewater District Contracts LEE + RO to provide Critical Force Main Improvements at Three Lift Stations

Dual Force Mains for Enhanced Reliability



Force mains play a critical role in a raw sewage system. It is crucial to be proactive in force main repairs and improvements as force main failures lead to sewage spills and emergency repairs are extremely costly. Repairing only the failed sections leaves vulnerable the remaining length of the force main, which has equally aged. A capital improvement project (CIP) to replace the aging force mains are often warranted.

The West County Wastewater District (District) recently experienced multiple force main failures. After performing emergency repairs, the District awarded LEE + RO with a capital project for three (3) critical force main improvements, and requested that LEE + RO consider a secondary discharge option using a dual force main for enhanced system reliability.


PROJECT 1 - Lakeside Lift Station

Lakeside Terrain over Proposed HDD Alignment

The emergency-repaired, 40-year-old, 1,550 LF, 8-inch ductile iron force main at the Lakeside Lift Station carries pumped flow to a manhole at 500 gpm and 120 ft. of total dynamic head. The first 300 LF of the force main is through brush-covered hillside terrain sloping up to a shopping mall. The remaining 1,250 LF of the alignment follows the right-of-way (ROW) around the mall and then through a common utility trench in the shopping mall parking lot.

LEE + RO specified horizontal directional drilling (HDD) for the installation within the brush-covered hillside terrain. Compared with open trench methods, HDD avoids environmental permits and significantly reduces the construction duration. High-density polyethylene (HDPE) was selected for both sections because of its superior corrosion-resistant properties. The dual force main system is operated via motor-operated valves (MOVs), powered and controlled from the lift station. With dual force mains, future maintenance will be simpler to perform since bypass pumping will not be required.

Challenges ranged from the project terrain, through the pipeline alignment, to environmental concerns, utility conflicts, and easement rights issues. Most challenging was the compressed design schedule set by the District for delivering the bid documents – a 30-working day turnaround from the District’s Notice to Proceed.


PROJECT 2 - Hilltop Green Lift Station

Hilltop Green Proposed Force Main tinified

The force main at Hilltop Green Lift Station recently suffered a catastrophic failure and a part of the existing force main was subsequently replaced. However, the most upstream portion, consisting of 870 LF of 40-year-old 10-inch diameter ductile iron pipe, was not and it is now the weakest link. As Hilltop Green Lift Station is not adjacent to public rights-of-way (ROW), several routing options were developed. The District selected an alignment that runs through a parcel owned by the Community Center. Construction consists of a combination of short runs utilizing horizontal directional drilling (HDD) in addition to open trench sections. The District also expressed interest in dual force mains where each force main will discharge to a separate manhole for enhanced reliability.

LEE + RO specified HDD on key segments of the replacement force main within the current easement. For example, the control building for the lift station sits immediately downstream of the lift station within the District’s existing easement. Utilizing an HDD method of construction avoids the need for acquisition of costly additional easements and extended construction durations by means of a deep pipeline profile that only the HDD method can achieve. In addition, with the alignment running through a wooded hillside, HDD requires neither environmental permits nor incurs additional project costs for removal of trees, which would be required for open trench methods.

High density polyethylene (HDPE) was the selected force main material of construction for both the HDD sections and the open trench sections due to its superior corrosion resistance properties. The dual force main system operates via motor-operated valves (MOVs), both powered and controlled from the lift station. With dual force mains, future maintenance will be cheaper and simpler to perform since bypass pumping will not be required.

Challenges with this project included developing the force main alignment alternatives because the lift station is surrounded by individual parcels and not adjacent to a public ROW. The construction start was delayed significantly due to prolonged easement negotiations with the Homeowners’ Association (HOA) that represents the neighboring homes and the Community Center. Similar to the Lakeside Lift Station Force Main Project, the design schedule set by the District for delivering the bid documents was compressed to a 30-working day turnaround from the notice-to-proceed date.


PROJECT 3 - La Honda Lift Station

La Honda Lift Station and pipeline alignment tinified

The La Honda Lift Station force main is a 60 year old 6-inch diameter cast iron pipe. LEE + RO designed approximately 150 LF of dual force main using HDPE pipe. MOVs allow the selection of the duty and standby force main. HDD construction methods were not used due to short 150 LF pipe length. Because HDPE is flexible, tree removal was avoided while utilizing traditional open trench methods of construction. The project required extensive coordination with the District and the County for easement acquisition and with the District and a neighboring parcel owner for a temporary construction easement.

Challenges with this project were mostly the environment, terrain, and the lack of available mapping information for the existing surrounding parcels. LEE + RO sought to protect an adjacent stream through carefully thought-out construction activities and methods. As with the other two projects described above, the most challenging aspect was the compressed 30-working day design schedule set by the District for delivering the bid documents.


LEE + RO Awarded Contract to Design Two Diamond Bar Pump Stations for LA County Department of Public Works

The Sewer Maintenance Division (SMD) of the County of Los Angeles Department of Public Works has awarded LEE + RO with a contract to provide design engineering services for the preparation of two separate but concurrent Preliminary Design Reports (PDR) for the replacement of the Fountain Springs and Indian Creek Pump Stations, both located within the City of Diamond Bar.

The PDRs will evaluate optimal solutions for the replacement of the two pump stations and will serve as the basis of design for all elements in the final design of the project. The evaluation will focus on the ease of constructability, process benefits, and overall project quality along with construction, lifecycle, operation, and maintenance costs.

Project elements for the two pump stations include the construction of new pump stations including all civil, architectural, landscaping, structural, mechanical, electrical, and I&C engineering.

  • Fountain Springs Pump Station will include five (5) new 3,150 gpm pumps and a rehabilitation of the existing dual force main.
  • Indian Creek Pump Station will include two (2) new 350 gpm pumps and a new 6-inch diameter dual force main, along with other site improvements.

The existing pump stations will be demolished after the new pump stations are constructed and are placed into service.

FS+IC Combined Photo
October 2021

LEE + RO to Design a New Sewer Lift Station for the San Bernardino Municipal Water Department

The San Bernardino Municipal Water Department (SBMWD) owns and operates the Meridian Lift Station, which is adjacent to many single-family residences, as well as the San Bernardino Flood Control District’s Randall Basin, near Randall Avenue and Meridian Avenue in the southwest portion of the City of San Bernardino. The lift station was constructed and placed into service in 1983. At 38 years old, it is in relatively poor condition and suffers from operational challenges.

The existing lift station consists of two self-priming pumps located in a small FRP enclosure, a below-grade wet well and associated electrical equipment. A sliding Quonset-hut style enclosure contains the pumps, electrical panels, and the control panel. The lift station has a limited storage capacity to provide adequate response time to address potential station operational issues and is not equipped with a backup power supply.

A 2019 Sewer Master Plan assessed the station’s condition and determined that most components had exceeded their useful service lives and recommended that the entire lift station should be replaced to improve facility reliability and reduce the risks of a Sanitary Sewer Overflow (SSO). The replacement lift station shall be capable of handling peak wet weather flows with built-in 100% redundant pumping capacity and shall be equipped with SCAQMD permitted emergency backup power.

LEE + RO’s scope of work includes preliminary design, final design, CEQA compliance, bid phase services, and construction support services to replace the existing station with a new modern pump station. The new lift station will consist of a new wet well equipped with a 2+1 submersible pump lineup, new electrical building to house the station’s switchgear, MCCs with variable frequency drives, PLC-based controls, and SCADA system, a 100kW emergency standby generator, and site improvements that will improve site security, increase capacity and reliability, increase operational flexibility by providing modern pump station controls, increase system efficiency and reduce energy consumption, and reduce operations and maintenance issues by providing a new lift station that meets SBMWD’s current operational design criteria.

SBMWD News Photo Cropped
October 2021

LEE + RO to Design a New Chloramine Booster Station at IRWD’s Turtle Rock Zone 3 Reservoir

Irvine Ranch Water District’s (IRWD) Turtle Rock Zone 3 Reservoir (TR Z3 Res) is located in Irvine and supplies water to the surrounding Turtle Rock neighborhood and to the Zone 3 to 4 Pump Station (TR Z4 PS), which serves the uppermost portion of the neighborhood. IRWD has experienced degraded water quality at the TR Z3 Res due to nitrification caused by the loss of chlorine residual, excess free ammonia, and low water supply turnover. Currently, IRWD doses chlorine and ammonia at the Turtle Rock Zone 1 to 3 Pump Station to reduce nitrification in the system but this process is susceptible to chemical precipitation within the pipe where the chemical is injected necessitating multiple replacements of the injection pipe.

This project aims to improve the water quality in Turtle Rock Zone 3 and Zone 4 by upgrading the mixing system inside the TR Z3 Res and constructing a chloramine booster station at the reservoir similar to the chloramine booster stations that are in service at multiple reservoirs throughout IRWD’s potable water system to address the nitrification and in-pipe chemical precipitation issues.

LEE + RO’s design scope includes preliminary design, final design, and bid phase support services.

The design improvements include:

  • Chloramine booster station building complete with chemical storage for 12% sodium hypochlorite and aqueous ammonia (19% vs. 29%), chemical metering pumps, chlorine analyzer equipment, reservoir mixing equipment, and related electrical, instrumentation, and control equipment
  • Evaluation of potential alternative locations for the station
  • Evaluation and recommended improvements to provide adequate mixing of the existing reservoir
  • Performing Computation Fluid Dynamics (CFD) analysis to determine the optimal mixer size and location
  • Developing a chemical dosing control strategy based on chlorine residual
  • Evaluating the existing power supply and identification of required electrical improvements
  • Designing the instrumentation and control system for the new chloramine booster station, including SCADA connection
  • Addition of sewer service to the new chemical containment drainage system to facilitate drainage for routine cleaning or in the case of a chemical spill
  • Providing access to the reservoir from the chloramine building
October 2021

LEE + RO to Provide Engineering Design Services for the Replacement of Two Raw Water Storage Reservoir Liners

The City of Brawley (City) owns and operates a 15 MGD capacity water treatment plant and distribution system that includes two raw water storage reservoirs and two spent backwash water storage reservoirs. The reservoirs are concrete with polypropylene liners.

In 2010, LEE + RO performed a condition assessment that included an evaluation of the reservoirs’ existing polypropylene liner material and to determine the areas of needed repairs and repair and/or replacement methods. The study concluded that the liner material on the reservoirs’ sloped sidewalls was deteriorating, most noticeably above the water surface level where the liner is exposed to direct sunlight, and that the reservoirs were leaking. The study recommended replacement of the liners for all four storage reservoirs. LEE + RO designed liner replacements for the two spent backwash water storage reservoirs in 2015.

The City has now contracted with LEE + RO to provide the engineering design services for the replacement of the liners in the two raw water storage reservoirs. Services include final design, bid phase support services, engineering services during construction and construction inspection services, which include inspection of subgrade and surface preparation, inspection of the liner installation, extrusion welding and hot-air welding procedures, seam integrity, cleaning, and field testing.

NEWS Photo
October 2021

LEE + RO Partners with Gate 5 Energy Partners on New System that Transforms Biosolids into 100% safe and usable resources

LEE + RO is providing Gate 5 Energy Partners, Inc. (Gate 5) with design services for construction documents and supporting material to complete a demonstration scale of their MG5 System at Santa Margarita Water District’s Chiquita Water Reclamation Plant. Currently, the Chiquita plant treats approximately 6 MGD during dry weather and can receive flows of up to 9 MGD during storm events.

Gate 5 received a grant from the California Energy Commission (CFO-20-309 – “Energy Positive Advanced Primary and Secondary Wastewater Treatment") to demonstrate the effectiveness of their MG5 system – an economically and environmentally superior method of advanced primary and secondary wastewater treatment with energy positive solids management.

Gate 5’s MG5 system combines an advanced primary and secondary wastewater treatment system developed by MicroMedia Filtration, LLC and an energy positive sludge management and resource recovery system process, developed by Gate 5, that transform the resulting solids into 100% safe and usable resources.

“The demonstration project will enable Gate 5 to show how the System will dramatically reduce the energy consumption of wastewater treatment, produce surplus renewable energy, and cut solids production, yielding energy, footprint, operations & maintenance, and provide environmental benefits.” said Steve Delson, Gate 5’s CEO.

Delson also noted that “the System can be scaled and replicated for numerous wastewater facilities throughout California and the United States, replacing conventional activated sludge systems (CAS) or expanding capacity to meet community growth.”

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October 2021

The City of Brawley Contracts LEE + RO to Design a New UV Disinfection System

The City of Brawley (City) owns and operates a wastewater treatment plant with a 5.9 million gallons per day permitted capacity. The influent wastewater is treated by extended aeration basins (i.e., Biolac system) and secondary clarifiers. The secondary effluent is then disinfected by a Trojan UV4000 system and then discharged to the New River.

The City installed the TrojanUV4000 system in 2001. This was an advanced UV disinfection system designed for large wastewater treatment plants and it has provided effective disinfection against waterborne pathogens to meet the effluent discharge requirements.

Due to the evolution of UV technology and newer UV wastewater disinfection systems, Trojan ceased production of the UV4000 in 2017. Partly based on LEE + RO’s successful installation of a new UV system for the City of San Diego’s South Bay Water Reclamation facility, the City contracted with LEE + RO to provide engineering services for the design and construction of a new replacement disinfection system.

LEE + RO’s scope of work covers engineering services including an initial site investigation, review of existing disinfection and effluent discharge requirements, selection of a TrojanUVSigna model (duty and standby banks), designing the structural modifications, and providing the electrical and control system design for the new installation and designs for associated electrical system improvements, civil and structural improvements, as well as providing bid phase engineering services and engineering services during construction.

The new system will provide the City various benefits including low lamp count and high electrical efficiency, optimized power consumption, easy UV lamp change, and much more.

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October 2021

LEE + RO To Design the Upgrades and Expansion of the City of Colton’s Wastewater Treatment Plant

LEE + RO has completed several projects for the City of Colton, including their Wastewater Treatment Plant Centrifuge project, Plant 2 Condition Assessment, and the Prado Booster Pump Station Upgrades (currently under construction). Their wastewater treatment plant (WWTP) consists of three treatment plants:

  1. Plant No. 1 was constructed in 1949 - Conventional Activated Sludge system that was removed from service in 2004 and demolished in 2020
  2. Plant No. 2 constructed in 1971 is expected to be removed from service soon, and
  3. Plant No. 3 constructed in 2000 is an Extended Aeration Activated Sludge system

Combined, the WWTP has a capacity of 10.4 million gallons per day (MGD). The plant provides secondary treatment, nutrient removal, solids removal and solids digestion utilizing conventional and extended aeration, anaerobic digestion, solids dewatering and drying.

The WWTP has been in service for over 50 years and many of the components are at the end of their useful service life and require upgrade or replacement. With the City currently planning to remove Plant No. 2 from service, Plant No. 3’s expansion is necessary to accommodate the projected future flows.

LEE + RO’s designs will ensure that the City’s goals to increase the efficiency and reliability of the WWTP, replace outdated equipment and facilities, upgrade treatment processes, and increase WWTP capacity will be achieved. The project scope includes new construction and improvements to existing major process components.

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September 2021

Rancho California Water District Awards LEE + RO the Sewer Flow Redirection Design Contract

The Rancho California Water District (RCWD) and Eastern Municipal Water District (EMWD) have entered into a mutual agreement to swap sewer flows to allow for the decommissioning of RCWD’s Winchester Park lift station.

The current sewer flows entering the lift station will be permanently diverted at the influent manhole (MH) to the downstream gravity sewer connected to EMWD's gravity collection system. An equal amount of flow (50,000 gallons per day current to 270,000 gpd buildout) will be diverted from EMWD's gravity sewer to the Santa Rosa Water Reclamation Facility at the Adams Avenue Diversion structure.

LEE + RO’s role is to review, evaluate, and validate RCWD’s developed and selected concepts for flow control modifications and flow diversions. LEE + RO will make recommendations supporting the flow control concepts, develop flow calculations, preliminary layout, sizing, and configuration of the recommended flow control facilities.

LEE + RO’s design services are for a bid-ready set of contract documents. The documents will include plans, specifications, and cost estimates for the Winchester lift station Influent MH Modifications and the Adams Avenue Diversion Structure Modifications.

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LEE + RO Recognized by ASCE and APWA with Awards for the UV Disinfection System Replacement Project at San Diego’s South Bay Water Reclamation Plant

LEE + RO and the City of San Diego are honored to be named by ASCE – San Diego Section as the winner of the 2020 “Outstanding Wastewater Treatment Project” and by APWA – SD Section as the winner of the 2021 “Project of the Year” awards for the UV Disinfection System Replacement Project at the South Bay Water Reclamation Plant.

The City of San Diego partnered with LEE + RO on the design of a new UV system that not only is more efficient resulting in reduced maintenance time and cost, but also ensures that the reclaimed water is safe and ready for distribution.

To learn about this project, read the case study.

SD UV Project News
July 2021

Fraxia Engineering for San Jose Water Company

Fraxia Engineering (Fraxia), a San Jose-based firm, won the contract from the San Jose Water Company (SJWC) to install a chloramination system inside a new block building at their 12th Street Station facility. SJWC has installed this type of system on other facilities.

Fraxia to be the EOR for civil/mechanical design. Structural engineering services includes the design of a new block building , elevated equipment pads, FRP grating, subsurface concrete containment, specifications, calculations, engineering estimates, etc. Blowers or powered ventilation design provided by LEE + RO and electrical engineering by SJWC.

LEE + RO's role will be as a subconsultant to Fraxia and will provide structural and HVAC mechanical engineering services to Fraxia. The scope of works includes:

  • Site improvements include grading, yard piping, chemical injection points, access road and lighting improvements.
  • Installation of a chloramination system with onsite sodium hypochlorite generation (OSHG) and liquid ammonium sulfate (LAS) storage with associated chemical feed pumps, foundation pads, and brine storage.
  • Installation of a new CMU block building approximately 21 feet x 62 feet for the OSHG system, hypochlorite storage tank, and LAS storage tank.
900 S. 12th Street, San Jose-#1 and 2 v2
JUNE 2021

LEE + RO Promotes Principal Engineer Sam Lee to QA/QC Manager

CITY OF INDUSTRY June 28, 2020 – LEE + RO, Inc., today announced that it has promoted Principal Engineer Sam Lee, P.E., to QA/QC manager. Lee, working together with company President Charles Ro, will take the lead in solidifying the firm’s quality management system through enforcement of corporate policies, procedures, and protocols for quality planning, quality assurance, and quality control.

Lee brings his 14 years of engineering experience at LEE + RO to the task. His intimate knowledge of internal operations and processes combined with his understanding of LEE + RO’s diverse range of clients and projects place him in a position to continuously improve and enforce the company’s QA/QC procedures.

To read the full story, click here.

Sam Lee Blue Border
June 2021

LEE + RO wins City of Anaheim contract to design the replacement of potable water mainline that crosses Interstate 5

Speed is essential to meet Caltrans' permitting requirements

The City of Anaheim’s (City) Department of Public Utilities has contracted LEE + RO to design the replacement of their existing 16-inch diameter potable water mainline with a new 24-inch diameter potable water mainline. The project straddles the boundary between the City of Anaheim and the City of Orange and runs along Orangewood Avenue, crossing the I-5 Freeway.

To meet the critical path permitting schedules with the Cities of Anaheim and Orange, and Caltrans District 12, LEE + RO’s project approach will be to leverage the available topo maps and utility maps to expedite preliminary design. LEE + RO will perform an alternative alignment analysis and present recommendations to the City. The preliminary design will be advanced through the 100% final design with final approvals from the various cities, departments and permitting agencies.

The proposed 1,000 LF 24-inch diameter waterline will connect to an existing 16-inch diameter butterfly valve at Manchester Avenue and to an existing 12-inch diameter gate valve at Anaheim Way.

To ensure minimal traffic congestion, inconvenience and maintain control, detailed traffic control plans will be prepared for the different phases of work, keeping at least one lane always open in all directions. Underground utilities will be located using GPR scanning and utility potholing.

90% plans will be submitted to all permitting agencies and departments to kickstart the permitting process. The 100% plans will incorporate all comments from the City, permitting agencies and departments for final approval and signatures.

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June 2021

Supervising Engineer Eric Magee Promoted to Manager of the San Diego Office

SAN DIEGO, Calif. June 21, 2021 – LEE + RO, Inc., today announced that Supervising Engineer Eric Magee, P.E. ENV SP, has been named the San Diego branch manager. He assumes the role from Vice President Eric Lovering, P.E., who was recently promoted to chief engineer. Lovering, who managed the region for the past 17 years, will continue to work out of the San Diego office.

Magee joined LEE + RO in August 2020, bringing his 24 years of engineering experience in water, wastewater, and recycled water to the company.

To read the full story, click here.

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JUNE 2021
New battery storage technology available for water and wastewater facilities
CPUC authorizeS $1 billion IN funding through THEIR Self-Generation Incentive Program.
Battery storage can be aN ADDITIONAL component of a more robust emergency preparedness plan in the event of a power outage.

According to the California Energy Commission: Pumping, treatment, and distribution of water account for nearly 20 percent of the total electricity consumed in California. The report also stated that “… batteries are a key part of the energy transition especially when it comes to providing grid energy storage.

The advances in lithium-ion technology have reached a level that provides a high-cycle efficiency and fast response times that make it a viable backup alternative for water and wastewater treatment plants.

The CPUC’s Self-Generation Incentive Program offers rebates for installing energy storage technology, which includes battery storage systems that can function during a power outage.

The three key attributes of battery storage technology are:

• Emergency Backup – Powers a facility when the grid goes down
• Peak Shaving – Discharge during peak demand time to avoid or reduce demand charges
• Load Shifting – Shift energy consumption from one moment to another to avoid paying high energy prices

Join our host Kenneth Creager, a Supervising Electrical Engineer at LEE + RO, who will moderate the panel discussion.

Our panelist of battery storage experts are:

Jacob Moeder: Senior Engineer at Irvine Ranch Water District
Danny Lee: Senior Vice President at Blue Oak Energy
Liam Weaver: Senior Solutions Engineer at Enel X

AC21 Forum 2nd Post
MAY 2020

Join LEE + RO’s Chief Engineer Eric Lovering and SFPUC’s Senior Engineer Linda Leong at CWEA’s AC21 conference on June 9th

Joins us on June 9th from 7:30 AM to 9:00 AM for a brisk presentation on the topic of Motors and Variable Speed Applications at AC21. The subjects that will be covered include:

  • How Motors Work
  • Pump vs System Curve
  • Pump Efficiency
  • How Much It Costs to Pump Water

Moderator: Linda Leong, SFPUC
Ms. Leong works in the Wastewater Enterprise division of SFPUC. She has been with the commission for more than twenty-five years and her focus is on improving the quality of life for San Francisco residents, workers, and visitors by providing customers with high-quality, efficient, and reliable sewer services.

Ms. Leong has an M.S. in Environmental Engineering, a B.S. in Chemical Engineering and Materials Science, and her work experience in environmental engineering includes working on water and wastewater treatment studies, planning, design, and construction. She is a California-registered Civil Engineer.

Primary Speaker: Eric Lovering, LEE + RO
Mr. Lovering is the Chief Engineer at LEE + RO. He has successfully completed dozens of public works projects from engineering design through construction, start-up and commissioning. He is a pump station subject matter expert, which has led to guest speaking engagements for ASCE and CWEA. Mr. Lovering has extensive training and hands-on knowledge in civil, hydraulics, pump sizing and selection, mechanical and electrical, including power distribution, instrumentation & controls (I&C), programmable logic controllers (PLCs), and SCADA systems.

Mr. Lovering received his B.S. degree in aeronautical engineering from UC Davis. He holds California-registered licenses as both a professional civil engineer and a professional electrical engineer.

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MARCH 2021

LEE + RO to Provide Riverside’s Public Works Department with an Assessment of their Wood Road Sewer Pump Station

The City of Riverside’s Public Works Department is experiencing operational challenges at their Wood Road sewer pump station. Some of the issues are heavy ragging, extended VFD ramp-up time, pumps not operating at recommended efficiencies, and most recently, failure of the ultrasonic sensors.

LEE + RO has been contracted by the City to assess the current conditions, understand issues to gain insights and recommend modifications to the existing operations, and programming to relieve the current operational challenges.

LEE + RO will:

  • Review the existing records
  • Perform site visits
  • Conduct interviews with City operations and maintenance staff
The findings will be presented in an assessment report summarizing solution alternatives, complete with recommended improvement options.
Wood Road Sewer Pump Station Reduced
MARCH 2021

LEE + RO to Design Two Replacement Lift Stations for the city of Riverside

The city of Riverside has contracted LEE + RO to prepare the construction documents for the replacement of two existing wastewater lift stations: Fairgrounds Street Lift Station and Dexter Drive Lift Station. Both of the existing lift stations were originally constructed in the late 1960s with a wet well manhole and a pump chamber vault with pedestal mounted pumps in a duplex (duty/standby) configuration.

The City’s objective is to replace each of the existing lift stations with a new lift station that conforms to the City’s current sewage lift station and force main guidelines that include wet well submersible pumps and valve vaults.
Improvements include:

Fairgrounds St. Lift Station

  • New 10-ft diameter x 20-ft deep wet well
  • Two new 280 gpm submersible pumps with new MCC
  • Upgraded electrical service from 230V to 480V
  • New valve vault
  • New 8-inch force main
Dexter Dr. Lift Station
  • New 10-ft diameter x 15-ft deep wet well
  • Two new 170 gpm submersible pumps with new MCC
  • Upgraded electrical service from 230V to 480V
  • New valve vault
  • New 8-inch force main

These projects improve the system’s overall performance, maintains reliability of the sewer system, and ensures that infrastructure meets the City’s current standards.

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LEE + RO to Design a New 12-kV Electrical Service Entrance Switchgear for Sonoma County Water Agency

The Sonoma County Water Agency (SCWA) owns, operates, and manages the electrical system at Sonoma Water's Airport/Larkfield/Wikiup Sanitation Zone's Treatment Plant. The treatment plant was constructed in the early 1980s and a photovoltaic system was installed in 2007 to offset utility costs. Currently SCWA staff must schedule a PG&E utility shutdown to safely isolate the treatment plant electrical system from the utility service when conducting routine maintenance and repairs. SCWA wants the connection to the photovoltaic system reconfigured to facilitate isolation of the treatment plant electrical system.

LEE + RO has been contracted to provide the engineering design and construction support services for the installation of a new outdoor service entrance switchboard designed per PG&E Greenbook standards. LEE + RO will design a new 12-kV service entrance switchgear that facilitates electrical isolation of the existing 12-kV distribution switchgear from PG&E. This will allow maintenance of the 12-kV distribution switchgear without requiring a PG&E shut down. The 12-kV feeder to the existing photovoltaic system shall be reconfigured to comply with current PG&E requirements.

The design of the site improvements at both the new and existing switchgear will protect the equipment and improve staff working conditions. Improvements include canopies with lighting over equipment and concrete pad modifications to provide required working clearances and prevent standing water around the equipment.

SCWA 12-kV Electrical Service Entrance Switchgear

Gloria Hodgers-Cortez Joins LEE + RO as an Administrative Assistant

Gloria has extensive experience providing support services having spent 15 years working at the Los Angeles County Superior Court. She was responsible for maintaining accurate court records, findings, and entering information into the case management system, as well as reviewing and processing a variety of legal documents for assigned Judicial Departments.

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Claudia Almaraz Promoted to Business Development Coordinator

Claudia joined the LEE + RO team back in June 2018 as an administrative assistant. Over these past 2-1/2 years, she has been a jack-of-all-trades and eager to help anyone who needed support related to ongoing projects.

With all her acquired company knowledge and her desire to learn more, she’ll be a great addition to our growing business development team.

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Santa Clarita Valley Water Agency Awards LEE + RO the Contract to Design the Replacement of the Saugus Water Wells #3 + #4

The Whittaker Bermite Corporation was a munitions manufacturer who, from 1934 to 1987, manufactured, stored and tested munitions, explosives, and other military equipment on a 996-acre, undeveloped site in the Santa Clarita Valley. After the closure of the factory, soil and groundwater analysis showed significant perchlorate contamination of local soil and groundwater due to these testing activities. Perchlorate is a primary ingredient in explosives. In 2007 the Castaic Lake Water Agency (now the Santa Clarita Valley Water Agency – (SCVWA) sued and was awarded damages as a result of losing 2,500 gpm of groundwater pumping capacity due to perchlorate contamination.

In 2015, LEE + RO was retained to perform a feasibility and alternative analysis for the siting and construction of the replacement wells at six different locations in SCVWA’s service area and to determine probable construction costs and direct arbitration assistance on behalf of SCVWA.

In 2019, LEE + RO was retained to update the probable construction costs based on a new favorable well location. The new available well site is located next to Magic Mountain Theme Park. This location dramatically reduces construction costs by eliminating the need to build a costly new raw water pipeline from the wells to the SCVWA’s treatment works due to its proximity to a future turnout of an existing raw water pipeline.

LEE + RO has now begun the final design for the equipping of the SCVWA’s replacement wells. This project will equip two wells, Saugus #3 and #4, to pump 2,500 gpm of potable water from a well depth of approximately 2,500 ft below ground surface (bgs). Well equipping design for Saugus #3 and #4 is concurrent with well drilling/construction. Well facilities will include exposed mechanical equipment, weatherproof or enclosed medium and low voltage electrical equipment & networking, onsite chloramine-based disinfection and pump-to-waste connections within a security fence. Construction is expected to be complete in Q3 2022.

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Kevin Saleh Joins LEE + RO as a Supervising Engineer

CITY OF INDUSTRY, Calif., January 28, 2021 – LEE + RO, Inc., today announced that Kevin Saleh, P.E., has joined LEE + RO as a supervising engineer. He will work out of the City of Industry office. Saleh has over two decades of experience in planning, design, construction management, and construction support services for various public works projects.

To learn more about Kevin, please click HERE.

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LEE + RO Wins Two City of El Centro Projects:

Convert the Gaseous Chlorine System to a Sodium Hypochlorite Disinfection System and Replace the Existing Raw Water Electrical Panel

The City of El Centro (City) owns and operates a Water Treatment Plant (WTP) that receives its water supply from the Colorado River through the Imperial Irrigation District’s (IID) canals. The City’s WTP has a design capacity of 21 MGD, with an average daily demand of 7.8 MGD and current peak flows of 13-14 MGD.

The WTP currently operates a gaseous chlorine water disinfection system to disinfect the water prior to discharging it into the City’s supply lines. The City has expressed concern regarding the usage of chlorine gas as a disinfectant, as chlorine gas is toxic and poses dangers to the public and operations staff. Since the WTP is located adjacent to residential areas, the risk of chlorine gas exposure to the public is greatly increased in the unlikely event of a large leak.

The City has contracted with LEE + RO to convert from a gaseous chlorine system to a 12.5% bulk sodium hypochlorite disinfection system. LEE + RO will provide the preliminary design, final design, bid phase and engineering support services during construction. Engineering services will include designs for construction of new bulk sodium hypochlorite systems, including all equipment, two (2) double-walled chemical storage tanks, five (5) chemical metering pumps, shower/eyewash stations, connected piping, valves, electrical and instrumentation, and process control via SCADA.

LEE + RO received a second contract for the replacement of the existing raw water electrical panel with a new electrical panel. The existing panel is utilized to feed electricity to four raw water pumps, a transfer pump, a HVAC unit and security lights. LEE + RO will provide the preliminary design, final design, bid phase and engineering support services during construction. The project design elements include:

  1. Replace the existing electrical panel (MCC-1) and its incoming feeder from the Plant MCC.

  2. Feed all four raw water pumps from the new/replaced MCC-1 via four VFDs, as well as feeding power to a transfer pump and the rest of the facility lighting, receptacles, and HVAC loads.

  3. Add a new RTU cabinet with compatible I/O cards, CPU, and power supply, to transmit pump status signals to the Plant SCADA system.

  4. As an optional scope item, an outdoor portable generator hook-up and manual transfer switch (MTS) will be provided.

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MWD Veteran Shiv Murti Joins LEE + RO as Principal Electrical Engineer

CITY OF INDUSTRY, Calif., January 28, 2021 – LEE + RO, Inc., today announced that Metropolitan Water District of Southern California veteran Shiv Murti, P.E., has joined the company as a principal electrical engineer. He has four decades of electrical and controls engineering experience in water treatment and conveyance, coal-fired power plants, nuclear plants, and oil refineries.

To read the full press release about Shiv, please click HERE.

Shiv Murti NEWS Headshot

LEE + RO Wins San Dimas Contract for Sewage Lift Station and Force Main Design Improvements

LEE + RO has been awarded a contract from the Los Angeles County Department of Public Works (LACPW) for design improvements at a sewage lift station and force main in the City of San Dimas. The contract is for the preparation of preliminary design plans, final design plans, specifications and construction cost estimate, bid support services, and construction engineering support for the rehabilitation and improvements to the Tract No. 37003 Sewage Lift Station and force main.

Since the construction of the force main and lift station in the mid-1980s, several small projects have modified the facility and force main piping. The force main has experienced repeated failures and exhibits signs of corrosion, and the coating within the lift station wet well appears to have pinholes and blisters. Several lift station site features are in poor condition having exceeded their beneficial life.

The scope of work includes:

• Studying the various possible alignments for the replacement of the force main and recommendations for the optimal alignment.
• Creating a design for the replacement of existing asphalt paving at the pump station site.
• Creating a design for replacing minor mechanical piping and valve modifications at the pump station.
• Specifying the wet well coating repairs.
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Michael Assadourian Rejoins LEE + RO as a Supervising Electrical Engineer

CITY OF INDUSTRY, Calif., January 7, 2021 – LEE + RO, Inc., today announced that Michael Assadourian, P.E., has rejoined LEE + RO as a supervising electrical engineer. He will be working out of the City of Industry office. Assadourian has over 30 years of experience in electrical and control systems engineering, design, and project management for water and wastewater treatment plants, pump stations, petrochemical plants, refineries, schools, and transportation facilities.

Assadourian has extensive expertise and in-depth knowledge in power distribution, emergency power generation, grounding, and lighting systems, both NEMA and IEC standards based; motor controls and variable frequency drives; coordination with utility companies; instrumentation and process control strategies, loop/logic/control diagrams, PLC wiring control, P&IDs, and SCADA interface.

Read the press release.

Michael Assadourian For News

LEE + RO Promotes Principal Engineer Richard Davis to Manager of QA/QC

CITY OF INDUSTRY January 7, 2021 – LEE + RO, Inc., today announced that it has promoted veteran engineer Richard Davis, P.E., to manager of QA/QC. Davis, working together with company President Charles Ro, will take the lead in implementing the firm’s quality management system through enforcement of corporate policies, procedures, and protocols for quality planning, quality assurance and quality control.

Davis brings more than three decades of managing wastewater and water infrastructure projects to this task. His expertise lies in the planning, designing and construction of sewage collection systems, pump stations, water transmission systems, and other capital improvement projects. Davis has also overseen the development of QA/QC programs, master plans, and the preparation of environmental documents in compliance with state laws and ordinances.

Read the press release.

Richard Davis for News Page

Civil Engineer Adam Betsworth, P.E. Joins LEE + RO Team

CITY OF INDUSTRY, Calif. – LEE + RO today announced that Adam S. Betsworth, P.E. has joined the company. Betsworth is a licensed civil engineer with over 15 years of experience working in both the municipal and land development spaces. He’s worked with AutoCAD for more than 21 years and is an expert with Civil 3D.

Betsworth’s municipal work includes potable and recycled water pipelines, wastewater treatment plants, lift stations, recycled water tanks, potable water reservoirs, and booster pump stations. His work in land development covered commercial grading plans, street plans, sewer, water, recycled, and transmission lines, storm drain plans, channels, traffic control plans, tract maps, legal descriptions, and writing complex exhibits and reports.

“As we continue our planned growth strategy,” said President Charles Ro, “having Adam’s 15 years of civil engineering experience combined with his expertise with AutoCAD and Civil 3D, positions LEE + RO to provide our clients with added value.”

“LEE + RO is a great company that has an extensive background in water/wastewater infrastructure, which aligns with my previous experiences,” said Betsworth. “Here I can expand my horizons as well as my career aspirations to become a project manager and lead a great team of engineers."

Prior to joining LEE + RO, Betsworth was an associate engineer with Webb Associates where he had the opportunity to sharpen his skills in municipal and land development areas. Before joining Webb, he was an associate engineer with Parsons Corporation. Betsworth started his career at KWC Engineers.

Betsworth received his B.S. in civil engineering from California State Polytechnic University, Pomona. Betsworth is a registered professional engineer (civil) in California.

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The Town of Apple Valley Awards LEE + RO the Design Services Contract for the Construction of a New Jess Ranch Lift Station

LEE + RO has been contracted by the Town of Apple Valley to provide the engineering design services for the construction of a new Jess Ranch lift station. The existing lift station was constructed to service the Jess Ranch residential community, which has been experiencing significant population growth over the past decade and is expected to continue throughout the coming decade. The project services include all civil, mechanical, structural, and electrical and I&C system designs.

Since its original construction, the community has grown significantly with additional residential communities to the south and an expansive retail district to the north. Future development in the area west of Deep Creek Road will also be serviced by this new lift station. Additional projects have been proposed and conditionally approved that also requires a new lift station to adequately service the area.

The project will identify and focus on an evaluation of the existing system and anticipated future demands and will include recommendations for potentially upsizing pump capacities and wet well volume, in addition to force main size. One of the key factors in the evaluation will be the high-water table, due to the fact that the proximity of the project location to the Mojave River presents construction challenges that must be considered during the design, such as bypass pumping and dewatering during the excavation of the new 30-ft. deep wet well.

LEE + RO will prepare a feasibility study presenting various design alternatives, including a hydraulic analysis of the existing and anticipated build-out sewer flows to determine the necessary pumping and storage capacities required and an electrical analysis to determine the new electrical load, utility service and sizing of the new electrical gear and generator.

The feasibility study will also present various types of pumping system alternatives, including self-priming pumps, non-clog pumps with submersible motors, a combination dry-pit / wet-pit arrangement, and a direct in-line pumping system. It will also address recommendations for a new replacement force main.

Following the selection of the preferred design alternative, LEE + RO will prepare final plans and specifications as well as estimates for the new replacement lift station and appurtenances.

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Design completed on San Diego County Water Authority's Hauck Mesa Storage Reservoir and Pipeline Surge Protection Project

LEE + RO has completed the design for the San Diego County Water Authority’s (SDCWA) $12.5 million Hauck Mesa Storage Reservoir and Pipeline Surge Protection Project in northern San Diego County. The main purpose for this project is to provide one hour of emergency flow regulatory storage (FRS) on the First Aqueduct.

A planning study determined that this site is the most viable site to meet system goals. It is not only located on a high point in the aqueduct system but also adjacent to the existing 66-inch diameter Valley Center Pipeline 2A. SDCWA procured the site and easement rights from the previous owner, Valley Center Municipal Water District (VCMWD). The existing reservoir on the site is currently out of service.

Construction is scheduled to begin in early 2021 and is estimated to be completed in the winter of 2022. The project elements include:
• Demolition of the existing steel tank and replacement with a new 1.8 MG capacity, prestressed-concrete above-ground reservoir with appurtenances
• Replacement of a portion of the 66-inch diameter CML&C welded-steel pipeline and other yard piping
• New isolation valve vault, underground flow control facility, electrical and controls, SCADA upgrades, and various site improvements.

The new storage reservoir will improve water deliveries by temporarily storing drinking water pumped to the Valley Center Municipal Water District, Vallecitos Water District, Vista Irrigation District, and the Rincon del Diablo Municipal Water District from the Claude “Bud” Lewis Carlsbad Desalination Plant and the Twin Oaks Valley Water Treatment Plant. The stored water will safeguard water deliveries from unanticipated water interruptions or pump station outages.

Hauck Reservoir photo

LEE + RO Names Jay Jung Vice President of Operations

CITY OF INDUSTRY, Calif. December 8, 2020 – LEE + RO, Inc. today announced that it has appointed Jay Jung, P.E., as vice president of operations. Jung will be responsible for overseeing the company’s operations, resource management and planning, as well as staff development and training. He's also a member of the senior management team and reports directly to the CEO.

Jung has intimate knowledge of LEE + RO’s operations as he’s been in a managerial position with the company since 2006. His responsibilities include resource allocation planning and direction, ERP platform utilization, project budget compliance and monitoring, project management oversite, and project managers’ best practices training.

To read the full press release, please click HERE.

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LEE + RO Names Vice President Eric Lovering its Chief Engineer

CITY OF INDUSTRY, Calif. November 18, 2020 – LEE + RO, Inc., today announced that Vice President Eric Lovering, P.E., has been named the company’s chief engineer. In this new role, Lovering will apply his 20 years of engineering experience, strong leadership qualities, and problem-solving skills to helping solidify the company’s position as a leader in the design, engineering, and implementation of water, wastewater, and recycled water infrastructure projects throughout California.

To read the full press release, please click HERE.

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Veterans Day: How it came to be.


At 11 AM on November 11, 1918, the war between Germany and the Allied forces came to an end. The Great War, which had killed more than 15 million people, needed to be acknowledged and remembered. A year later, King George V of England proclaimed that November 11th would be Armistice Day. In 1938, Congress made November 11th an official federal holiday in the U.S., a day set aside to honor veterans of the Great War.


In 1953, Alvin J. King of Emporia, Kansas, proposed changing the name of the holiday to Veterans Day to recognize veterans from all wars and conflicts. Though King never served in the armed forces, he was motivated by the fact that his stepson, John Cooper, died in combat during World War II. The Emporia community raised money so King could go to Washington to meet with officials and push them to change the name. The following year, President Eisenhower signed the law changing the holiday name to Veterans Day.


What is the difference between Veterans Day and Memorial Day?  


Memorial Day pays tribute to those who died in service to our country. It was established in 1868 to commemorate the more than 620,000 soldiers killed in the Civil War.


Veterans Day honors all who have served in the military.

Jhune, Madeleine, Eric, Greg, and Richard, all of us at LEE + RO thank you for your service.

L+R Veterans_with Richard

NOV. 10th: Zaheer Shaikh Moderates CWEAs Webinar on Risk Assessment of SARS-CoV-2 for Wastewater Workers and Strategies for Mitigation

Since wastewater treatment workers are at an increased risk of infection and illness from water-based pathogens, treatment facilities need to evaluate how job tasks/activities influence risk. This session will engage academics, industry, and wastewater workers in an interactive discussion of risk assessment and strategies for mitigation.

To join the webinar, please click HERE.


Sunset Beach Sanitary District Broadway Sewer Siphon Replacement

The Sunset Beach Sanitary District, located in Orange County, has issued a contract to LEE + RO to provide the design services,  construction management, and inspection services for this important District project. The Project entails replacing approximately 220 LF of existing 6-inch diameter cast iron sewer siphon crossing beneath Sunset Channel (60’ wide R/W) northwest of the existing bridge in Broadway (80’ wide R/W). The project goal is to proactively replace the 85-year old pipe, which is still in working condition, to provide greater pipe resistance to earthquake shaking.

The siphon was originally installed in 1935 under the Sunset Channel and was built using 6-inch cast iron pipe. The existing pipe has since been lined with a plastic liner in 1987. The District conducted an investigation in November 2019 to determine the location and depth of the steel sheet piling, and adjacent utilities as well as other features that will affect the replacement. Based on District’s experience and challenges with underwater investigation in the channel, any construction method directly affecting the waters, including open cut trenching in the channel crossing, has been removed from consideration. As such, various trenchless technologies have been selected herein for replacement of the Broadway Sewer Siphon.

Sunset Beach

In-Depth: The Rise of Impact Investment in the Water Sector

Why has impact investor interest in the water management space peaked recently? How can investors attain exposure to a sector that has historically been publicly funded? The answers to these questions are explained by analyzing several factors. Let’s first explore the predominant theories of water scarcity and investment. We will then assess how this investment thesis has been implemented in the past and present by intergovernmental organizations, index funds, and active asset managers. Lastly, we will share a few examples detailing the recent innovations and successes of water investors and companies that may offer us a glimpse at the future of the industry and its capital flows.  

To read the Oxford Business Review article, please click HERE.

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Electrical and I&C Veteran Kenneth Creager Joins LEE + RO as a Supervising Electrical Engineer.

Creager brings more than three decades of electrical and I&C experience in the water, wastewater, utilities, and petrochemical fields. His expertise includes power generation, substation design, power distribution, heavy industrial/facilities design, as well as automation and control systems design, power system analysis, master planning, and construction. To learn more, please click HERE.

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LEE + RO hosts a tech session at CWEA's AC20 Conference: "The Future of Wastewater Treatment Plant Design." 

We would like to thank Ian Bronswick of Delta Diablo, Rudy Guzman of the City of Oceanside, Garin Warren and Gary Lin from EBMUD, Rick Staggs and Cory Asher from the City of Fresno, and Ben Kikugawa of Tuolumne City for attending and providing some incredible insights as to their views about the future of WWTP design.

The discussion was centered around the following question: "Now that the activated sludge and secondary clarifier processes are over 100 years old, should municipalities and districts begin to think about embracing the newest technologies to achieve a higher quality effluent in a much more reliable way, and possibly at less cost to operate?"

LEE + RO CWEA Mastermind Session

LEE + RO Recognized by Engineering News-Record with the 2020 Best Water/Environment Project for the California Region

LEE + RO is honored to be recognized by Engineer News-Record for the design work on the Hyperion Secondary Effluent Pump Station for West Basin Municipal Water District (WBMWD). Due to the extremely small size footprint for the pump station, there were some doubts about the feasibility and constructability of the design. Working in partnership with WBMWD's general contractor PCL, the LEE + RO team tackled every challenge to successfully deliver an outstanding result. 

Said CEO Dhiru Patel, "We're proud of the collaborative approach that our team brought to this project. These improvements to Hyperion will save millions of gallons of potable water each year, protect our coastal aquifers from seawater intrusion, provide an economical alternative to using potable water for industrial processes, and reduce the amount of (treated) sewage released into the ocean—all while making beneficial reuse of an underappreciated, untapped resource: Los Angeles’ raw wastewater."

Click here to read the case study.

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LEE + RO at CWEA's 2020 Virtual Conference

WALNUT CREEK, Calif. October 15, 2020 – Aneal Shah, P.E., has joined the firm’s Walnut Creek office as a supervising engineer. Shah brings to the team more than 25 years of engineering and leadership experience in sustainable water. His professional areas of expertise include design and operational knowledge of activated sludge processes, membrane bioreactors, anaerobic digestion, advanced water treatment, and water re-use.
To learn more about Aneal, please click HERE.


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LEE + RO's Zaheer Shaikh to Moderate the CWEA's Session "Engineering & Research: Operation & Management Practices"

On October 21st, LEE + RO's Zaheer Shaikh, PE, will be moderating one of the key sessions at CWEA's virtual conference. The featured speaker is Jean-Marc Petit, PE, the Director of Engineering and Technical Services at Central Contra Costa Sanitary District. He's a 30-year industry veteran who oversees the Planning and Development, Regulatory and Environmental Compliance, and Capital Projects divisions for the District. 

LEE + RO is proud to be the PURE WATER PLUS sponsor of CWEA's virtual conference.

CWEA Featured Speaker
September 2020


LEE + RO is proud to be the PURE WATER PLUS sponsor of CWEA’s first virtual conference from October 19-22. As fellow Californians, we understand the challenges that we’re all dealing with during this pandemic. We also know how important it is to ensure that you and your team are delivering safe and secure water to your communities.

We hope that you are planning on attending. And if you are, we’d love to schedule a chat on Zoom to learn about your current challenges and explore how we can assist you and your team during these difficult times. We’ll even treat you to a cup of Starbucks coffee!

To schedule your 1-on-1 Zoom call, please email our VP of Marketing, Rick Liskow, at

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LEE + RO Launches LinkedIn Recruiting Campaign

LEE + RO today launched its "Make LEE + RO Your Choice" recruiting campaign on LinkedIn. The campaign is focused on its employees and why they chose to come to the company to either start their careers or to make the next move in their established careers. The fact is they're all looking for the same thing: a place where they can have the greatest impact.

The idea for the campaign came from the many interactions that company President Charles Ro had with a lot of the employees. "Our employees are the reason for our success and our ability to take the company to the next level. And we’re looking for people just like them: passionate professionals who will help move all of us and the great work we do forward."

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September 2020

Water Infrastructure Veteran Eric Magee Joins LEE +RO

Eric Magee, PE MBA, has joined LEE + RO as a supervising engineer. He’s an established civil engineer and a certified Envision Sustainability Professional. He brings more than two decades of experience and a passion for solving some of the most complex water infrastructure challenges facing California. Eric has extensive experience in water, wastewater, and recycled water engineering. To learn more about Eric, please click HERE .

Eric Magee News Lockup
September 2020

LEE + RO Donates to California Food Banks Struggling to Meet Increased Demand Due to COVID-19 Pandemic

LEE + RO has made donations to four food banks representing Northern, Central and Southern California. The recipients of $1,000 each are the Los Angeles Regional Food Bank, The Jacobs and Cushman San Diego Food Bank, Sacramento Food Bank & Family Services, and the Food Bank of Contra Costa and Solano.

“Our company has a commitment to providing water security for Californians for generations,” said LEE + RO President Charles Ro. “But with so many Americans struggling because of the coronavirus pandemic, we saw our mission reflected perfectly in this first focus on the urgent issue of food insecurity.”

With roughly 30 million Americans unemployed and 54 million facing hunger – including more than 18 million children – every community in the United States is at risk.

Fortunately, everyone can make a difference in the way that’s most meaningful for them:

Donations Sept 2020 New Lockup
June 2020

Riverside Regional Water Quality Control Plant Tequesquite Landfill Blowers Rehabilitation Project

The City has contracted with LEE + RO to replace the three-existing single-stage rotary sliding vane gas compressors with a new centrifugal blower system with two blowers. LEE + RO’s scope of work covers the demolition of the existing compressor system, design of the new VFD driven blower system, including an overhead canopy structure, condensate management, electrical, instrumentation and controls, and permitting assistance.

The City of Riverside is the owner and operator of the now closed Tequesquite Landfill. In 1988, a landfill gas collection system was installed to comply with regulatory requirements. Landfill gas was conditioned and compressed utilizing three rotary sliding vane compressors and transported via pipeline to the Co-Generation Facility at the City’s Regional Water Quality Control Plant (RWQCP). Gas strength and quality degraded over time and a gas flare was installed onsite to flare the landfill gas. In 2019, an ultra-low emission flare was installed to replace the original flare. However, the existing compressors are improperly sized for the new flare, generating inadequate vacuum to efficiently pull the landfill gas from the collection wells at the Tequesquite Landfill’s collection head and convey it to the new flare.

Riverside Lockup New
June 2020

Secondary Effluent Line Replacement and Davis St. Manhole Replacement

The City of San Leandro has issued a contract to LEE + RO to provide engineering services for a project to rehabilitate the 36”diameter Secondary Effluent (SE) line at the City’s Water Pollution Control Plant (WPCP), replace the sanitary sewer junction structure adjacent to the WPCP, and rehabilitate the existing 30” diameter and 33” diameter sanitary sewer pipes entering the plant from the junction structure. LEE + RO will provide the preliminary design, final design, bid phase and engineering support services during construction. Final design documents will be provided within 5 months of the notice to proceed. Project design elements include:

  • Install a CIPP liner in approximately 500 LF of the existing 36" diameter SE pipeline between the SE effluent box at Secondary Clarifier No. 1 and the Effluent Pump Station at the City's Water Pollution Control Plant
  • Provide a bypass plan for a temporary bypass pumping system to bypass the entire plant flow during the rehabilitation work
  • Clean the inverted siphon in the pipe prior to the rehabilitation work
  • Replace the existing influent junction box structure located in front of the old abandoned headworks with new manholes located in front of the new headworks
  • Install two new manholes on the two influent sanitary sewer pipes (30” diameter and 33” diameter) to reroute flow directly to the new headworks at the WPCP
  • Coordination with various agencies to relocate utilities, if necessary
  • Conduct CCTV inspection of approximately 3,200 LF of the 30" and 33" diameter sanitary sewer pipes
City of San Leandro - Secondary June 2020 Lockup
May 2020

Treatment Plant 1 Water System Hydraulic Modeling Services

Central Contra Costa Sanitary District has contracted LEE + RO to perform hydraulic modeling of the 1 Water (1W) system at their 54 MGD treatment plant. A computer-based model of the plant’s 1W system will be created in InfoWater and steady-state simulations of the existing system will be performed to analyze different demand scenarios such as Average Day, Maximum Day, and Peak Hour flows. Field testing will be performed to record flow and pressure measurements with the temporary flow and pressure loggers and the data will be used to calibrate the model.

Central CCSD May 2020 Lockup
April 2020

Ely Booster Station Hazard Mitigation Project

The Federal Emergency Management Agency (FEMA) awarded a $2.3 million Hazard Mitigation Grant to Sonoma County Water Agency (Sonoma Water) to provide Ely Booster Station protection against a 500-year flood and 7.0 magnitude earthquake. Ely Booster Station is located within 5 miles of the Rodgers Creek Fault and sits in a 100-year floodplain, and local assessments identified issues that threaten its reliability during a flood or a seismic event. Historically, the station has been inundated by floodwater during the rainy season, where extreme elevations of water threatened operability and raised safety concerns for onsite personnel.

Sonoma Water has contracted with LEE + RO to provide engineering design services for the improvements to Sonoma Water's Ely Booster Station. The result will be a long term, independent solution to the risks posed by flood and earthquake events. These actions will effectively provide protection against a 500-year flood event and a magnitude 7.0 earthquake and completion of the project will mitigate the risk of Sonoma County residents losing this precious water resource in the event of a disaster.

The engineering design services will include sealing and elevating electrical appurtenances above the 500-year floodplain, replacing the pump motor housing structures and anchoring equipment critical to the operation of the booster station. The project will also replace the existing medium voltage switchgear with a new switchgear, complete with new motor starters. The switchgear feeds two 500-hp pumps.

Sonoma County Ely Booster April 2020 Lockup
April 2020

Treatment Plant Piping Renovations Phase 10

LEE + RO has been awarded a project to design various mechanical and electrical improvements throughout the Central Contra Costa Sanitary District’s 54 MGD treatment plant. The scope of work includes:

  • Replacing the sodium hypochlorite piping
  • Replacing the secondary scum piping
  • Replacing the potable 1Water (1W) hydropneumatic tanks, pumps and piping system
  • Installing stop gates upstream of the UV basin inlet gate and replacing the UV inlet gates
  • Replacing the plant water (3W) system VFDs with smart VFDs
  • Replacing secondary clarifier conduit and conductors
  • Replacing corroding UV junction boxes in the pipe chase
  • Replacing lighting transformers for Substation Nos. 33, 34, 40, & 52
  • Replacing VFDs for UV air handler and hypochlorite pumps at hypochlorite site 1
  • Replacing the primary effluent pump 300HP VFD with a smart VFD
  • Replacing 8 Rexa actuator controllers on the aeration basin air headers
  • Resizing the hypochlorite dilution water centrifugal pumps at hypochlorite site 1
  • Replacing the boiler chemical piping with stainless steel tubing
  • Installing new chlorine analyzers for the 3W system
  • Replacing the secondary clarifier inlet gates
Center CC Lockup
April 2020

Rehabilitation and Betterment CIP: Electrical Upgrades

The Solano Irrigation District owns and operates approximately 200 agricultural electrical facilities that power pumps and wells at isolated locations throughout the District’s service area. As part of the first phase of improvements, the District selected some facilities to upgrade aging electrical equipment, provide shelter from the elements for the electrical equipment, and harden the sites against tampering, theft, and vandalism.

The project includes developing standard details for installing or upgrading electrical infrastructure and preparing plans and specifications for upgrading 13 existing electrical facilities, including permitting and coordinating with PG&E. In addition to the electrical improvement designs, LEE + RO will prepare design plans for necessary civil improvements, including grading, access roads and fencing, structures and foundations for panels and shade structures.

Solano Irrigation District April 2020 New Lockup
December 2019

Pressure Reducing Station Upgrades for the City of San Diego

Dokken Engineering has partnered with LEE + RO to provide the civil, structural (vault sizing and layout), mechanical, electrical and I+C engineering work for the upgrades to 11 of the City of San Diego’s pressure reducing stations at various locations within the City and to develop a Radio Repeating Station. The project consists of the design and construction of replacement pressure reducing stations, complete with supervisory control and data acquisition (SCADA) instrumentation, water main removal or abandonment and replacement, appurtenances, revegetation of the existing parkway areas, pavement resurfacing, curbs, gutters and sidewalks.

LEE + RO will prepare the civil, mechanical, structural, electrical and I&C plans for the pressure reducing stations, including piping in the streets and paving repairs. In addition to the design services, LEE + RO will also provide bid phase services and engineering support services during construction.

Dokken-City of SD Dec 2019 New Lockup
December 2019

Seal Beach Pump Station Replacement

LEE + RO has been awarded a contract by the Orange County Sanitation District (OCSD) to replace the existing 50-year old Seal Beach Pump Station with a new 34 MGD capacity pump station. The new Seal Beach Pump Station will feature a deeper wet well to facilitate the bypassing and eventual decommissioning and demolition of the upstream Westside Pump Station. The new Seal Beach Pump Station, located on the same site as the existing Seal Beach Pump Station, will meet current and future flow demands to year 2040. Due to a contaminated groundwater plume in the vicinity of the project, there is no allowance for water table drawdown or dewatering of the approximately 50-foot deep excavation.

The site layout is tightly constrained by the Naval Weapons Station Seal Beach, large arterial roads, and the existing Seal Beach Pump Station that must remain operational throughout construction. The new $45 million replacement pump station includes demolition, civil, mechanical, structural, architectural, HVAC, electrical, instrumentation and control systems design, site improvements including above ground buildings, underground vaults, manholes, new gravity sewer and force main segments, odor control, facilities for drainage, paving, landscaping and irrigation, perimeter walls and security, storm drains and other utilities, in addition to temporary facilities as required to maintain operation of the pump station during construction.

OC Sanitation D Dec 2019 Lockup New2
October 2019

Potable Water Steel Reservoir Seismic Retrofits

Moulton Niguel Water District (MNWD) owns and operates a total of 38 reservoirs as part of their potable and recycled water distribution systems. Of the 38 reservoirs, 32 are above grade/partially buried steel tanks with 26 tanks in the potable water system and 6 tanks in the recycled water system. An assessment study completed for the District in 2015 concluded that 18 of the 26 steel potable water reservoirs require one or more of the following improvements to comply with current seismic codes and standards:

  • Retrofit of the existing concrete ring wall footing
  • Installation of a flexible inlet/outlet coupling
  • Installation of a flexible drain coupling

In October 2019, the District engaged LEE + RO to provide the seismic retrofit designs for the 18 potable water steel reservoirs. The scope of work includes preliminary and final design; preparation of construction documents and construction cost estimates; FEMA Hazard Mitigation Grant requirements research and implementing procurement requirements into the construction documents; bid phase support; and construction phase engineering support services.

LEE + RO reviewed the structural calculations from the 2015 assessment study for one of the tanks and determined that tank does not require the concrete ring wall footing retrofits recommended in the study. The District requested that LEE + RO conduct a structural analysis on each of the other seven tanks that the assessment study recommended retrofitting the ring wall footings. This could potentially result in substantial savings to the District from not having to drain each of these tanks and take them out of service in addition to the cost of the retrofit work itself.

Moulton Niguel October 2019 New Lockup
October 2019

Sewer Lift Stations Nos. 9 & 11, Sewer Collection and Water Distribution System Improvements

The City of Calexico contracted with LEE + RO to provide engineering and design services necessary to increase the capacities and upgrade existing Lift Station No. 9 and Lift Station No. 11 and replace associated force mains and collection system gravity sewers, in addition to replacing domestic water pipelines to accommodate additional development in the area.

The project consists of the following items:

  • Increase capacities of two existing 250 GPM self-priming duplex lift stations to 1000 GPM each
  • Replace the lift stations’ existing 6-ft diameter wet wells with new 12-ft diameter wet wells.
  • The new skid-mounted centrifugal sewer lift stations shall be fully equipped with all associated piping, valves, and instrumentation.
  • New motor control centers (MCCs), control systems and alarms
  • New emergency backup generator
  • Lighting and perimeter fencing
  • Replace existing 12" AC waterline with new 12" PVC waterline
  • Replace existing 15" gravity sewer with new 24" gravity sewer
  • Replace existing 8" gravity sewer with a new 18" gravity sewer
  • Replace existing 8" and 10" force mains with new 8" and 10" force mains
  • Sewer bypass pumping
Calexico Lockup
October 2019

RP-4 Influent Screen Replacement Project - Stanek Constructors, Inc.

LEE + RO, as design engineer, partnered with Stanek Constructors to replace the existing influent screens at the Inland Empire Utilities Agency’s (IEUA) Reclamation Plant 4 (RP-4) with more reliable and efficient screens. This $2 million design-build project is intended to replace the two existing perforated plate fine screens with two new ¼” multi-rake bar screens. IEUA pre-negotiated and selected multi-rake bar screens from Duperon Corporation

LEE + RO’s scope of services includes:

  • Reviewing the existing As-Built drawings
  • Conducting a rag study to estimate the rag load and to size the new screenings washer compactor
  • Performing a 3-D scan of the influent channels to identify any issues with the channel walls potentially being out of plumb
  • Preparing design plans and specifications
  • Providing startup, testing, and commissioning services and operator training
  • Providing engineering support services during construction
  • Preparing new As-Built drawings
Stanek_IEUA RP4 Oct 2019 Lockup
April 2019

Regional Treatment Plant MCC Upgrades

The South Orange County Wastewater Authority's (SOCWA) Regional Treatment Plant (RTP) was constructed in 1982 and although there have been a series of upgrade projects over the last 20 years, much of the electrical system remains as originally installed in 1982.

In 2015 LEE + RO was commissioned to conduct an evaluation of the electrical manholes and handholes within the plant’s electrical distribution system. The improvement recommendations included reinforcement of the exterior concrete structures, repair of exposed reinforcing steel, replacement of the sump pump system, and additional support for the cable system for electrical Manhole #3.

Five motor control centers (MCCs) were installed within the Energy Building as part of the original construction. In 2019 LEE + RO was contracted by SOCWA to complete a condition assessment of the MCCs along with five VFD panels and prepare engineering and design documents for the replacement of the MCCs and the rehabilitation of electrical Manhole #3. As part of the MCC condition assessment, LEE + RO will also conduct a MCC utilization assessment to (1) determine the number of MCC buckets no longer in use and develop a plan for providing spare system capacity in the replacement MCCs; (2) conduct a safety assessment by evaluating conformance of area space with NEC, OSHA, and other Code requirements; and (3) develop an implementation plan to layout the procedures and protocol for addressing how the construction of the MCC replacements can be completed while maintaining the plant in operation, which includes construction phasing and identifying methods of providing temporary and standby power during construction.
SOCWA Regional April 2019 Lockup
MARCH 2019

Calexico WWTP Upgrading and Expansion

The City of Calexico owns and operates a wastewater treatment plant (WWTP) with a permitted capacity of 4.3 MGD. The existing WWTP consists of two treatment plants; the 2.5 MGD Plant 1 conventional activated sludge plant, and the 1.8 MGD Plant 2 aerated lagoons.

In December of 2017, LEE+RO was contracted by the City of Calexico to prepare a WWTP Master Plan to (1) determine the future wastewater treatment capacity for the next 10 to 20 years based on the current population trends and development projections; (2) perform a condition assessment and determine the life expectancy of the existing process units; (3) identify the unit processes with the lowest lifecycle costs; and (4) make recommendations for the WWTP capital improvements.

In March 2019, the City contracted with LEE + RO to provide the engineering and designs to implement the recommendations from the Master Plan. The upgraded WWTP will be capable of treating an average dry weather flow of 5.8 MGD and a peak wet weather flow of 11.6 MGD and will be capable of producing an effluent with low ammonia concentrations (i.e. less than 5 mg/l) in compliance with potentially reduced future regulatory requirements. LEE + RO’s design incorporates extended aeration basin technology to simultaneously treat the wastewater and reduce effluent ammonia concentrations.

The upgrades and improvements to the WWTP include:

  • New packaged septage receiving station
  • New self-cleaning bar screens
  • New influent metering structure
  • New vortex grit removal system
  • New influent pump station
  • 3 new extended aeration basins and appurtenances
  • New blower building with three new aeration blowers
  • 3 new secondary clarifiers, new RAS, WAS, and scum pump stations
  • Replacement of the existing Calgon UV system with a new Trojan UV 4000 disinfection system
  • New rotary drum sludge thickeners with polymer facility
  • New plant water storage and distribution system
  • New plant stormwater drainage system
  • New electrical buildings and electrical power distribution systems
  • New PLC/SCADA systems
  • New piping for conveyance of wastewater, mixed liquor, secondary effluent, sludges, and utility water
  • Miscellaneous site improvements including paved roads for access to main process units
Calexico WWTP March 2019 Lockup
MARCH 2019

Descanso Gardens

Descanso Gardens (Gardens) is a world-renowned botanical and horticultural garden located just north of the City of Los Angeles. The Gardens use on-site sewer collection, treatment, and disposal systems to treat the wastewater generated by on-site facilities. In 2012, they replaced their existing septic tank and leach field. In 2016, the system began experiencing capacity issues and seepage pit structure failures that resulted in untreated wastewater inundating the seepage pits forcing the Gardens to collect and haul away approximately 6,000 gallons per day of wastewater. John Robinson Consulting (JRC), contracted with LEE + RO to replace the 2012 system.

LEE + RO’s engineering and design services will center around a new membrane bioreactor (MBR) technology, which will produce Title 22-compliant tertiary (recycled water) effluent within a compact, modular footprint. In addition to restoring on-site treatment capacity, the new packaged MBR system will provide the Gardens with the opportunity to utilize the recycled water to irrigate the facility, thereby reducing the Gardens' operating costs and the facility's carbon footprint. The improvements will include:

  • A Cloacina Mempac-M MBR unit
  • Rehabilitation of two existing underground collection tanks
  • Four new 10,000-gallon above-ground recycled water storage tanks
  • New recycled water booster pumping system
  • New electrical switchgear for the Gardens’ new water recycling facility and existing electrical equipment
  • New emergency generator for the Gardens’ new water recycling facility

Descanso March 2019 New Lockup