Portfolio Projects: Wastewater Collection and Treatment

Service Type: Wastewater Collection and Treatment
Project Name:   Livingston Parish Wastewater Treatment Facilities Improvements
Project Location Livingston Parish, LA
Client:   Livingston parish Sewer District Nos. 1 and 2
Estimated Const. Cost: $4,600,000.00
Funding Sources: Local, USACE, EPA

PEC was the planning and design consultant for this Sewer District for over 10 years. It became apparent in reviewing the sewer needs for this part of the Parish, a new sewage treatment facility would be required. PEC reviewed the demographics, land use characteristics, existing collection system condition and related flows and developed the future projected wastewater capacity that would meet a 20 year growth period. PEC was authorized to undertake the design, plan preparation, and construction administration for a 1.5 MGD design capacity treatment facility with bar screen, grit removal, oxidation ditch with turbine aerators, clarifiers, automatic backwash filter, and aerobic digester. The firm followed all EPA and USACE environmental and administrative guidelines for this Sewer District to obtain funding for this much needed infrastructure project to handle growth in this area of the project. The project was considered one of the “State of the Art” small wastewater improvement projects at the time of its construction in 2004.

Service Type: Wastewater Collection and Treatment
Project Name:   New Effluent Pump Station & Force Main
Project Location Plaquemine, LA
Client:   City of Plaquemine
Estimated Const. Cost: $2,610,000
Funding Sources: Local Funds

Project design, plan preparation and construction administration for a new 5,000 gpm (8 mgd) effluent pump station and electrical building. Project also included a new 20” 25,000 LF effluent force main to divert the City’s WWTP’s effluent from Bayou Plaquemine to the Mississippi River.

Pump station has three 250 hp pumps which operate with variable frequency drives allowing for the effluent to match the plant’s influent flow and thus reducing water hammer and electrical load. The firm also obtained a critical COE levee crossing permit, which required a seepage and bank stability analysis and very close coordination with COE and the geotechnical consultants. The firm also identified least cost routing and associated ROW’s of the force main for discharge to the Mississippi River.

Service Type: Wastewater Collection and Treatment
Project Name:   Sanitary Sewer System Upgrades, Foster Road-Hooper Road Sewer Area Upgrades; North Service Area
Project Location Baton Rouge, LA
Client:   City/Parish of East Baton Rouge
Estimated Const. Cost: $8,800,000
Funding Sources: Local Funds

PEC was retained by the City of Baton Rouge/Parish of East Baton Rouge to provide wastewater consulting services for the project area entitled North Force Main Capacity Improvement Program. This project is part of the Baton Rouge SSO Program being implemented under the Consent Degree with EPA. The primary purpose of the respective project was to increase the capacity of the force main system along Foster Road and Hooper Road.

PEC investigated the estimated 20,000 linear feet of proposed force main routes for utility conflicts, available ROW, construction obstructions, and environmental concerns. The firm designed replacement force main lines ranging in sizes from 8 inch to over 36 inch lines. There was extensive directional drilling along the route required for crossing the Comite River and other complex traffic areas. The project required several project interfaces and coordination with existing pump stations being upgraded in the program by other consultants.

The firm also was selected to design an estimated 20,000 feet of road widening along Hooper Road to facilitate coordination of the sewer design and road design for this critical road access into the Central area.

As part of the sewer project study scope, PEC also investigated and identified the unsewered residents and commercials along the route. The existing septic tanks/modads and independent treatment systems sewage “tail” lines discharged into the existing drainage systems along the roadway. The road widening project requires the removal of these tail pipes and related sewer appurtenances out of the projected roadway widening. The most cost effective method to tie all unsewered residents and businesses into the City Parish existing and improved force main system had to be determined.

PEC undertook and completed the Un-Sewered Service Study in June of 2008 for the portions of Hooper and Sullivan Roads which are proposed to be widened.

Three alternatives were investigated in this study as follows:

Alternate 3 was determined most feasible – Construct a Conventional System, would require gravity sewers and six pump stations and would tie into the North Suburban Pressure Network Pipe along Hooper Road. (The additional flow is anticipated to be negligible relative to the capacity of the system’s capacity.) This system would also allow for future gravity tie-ins should growth occur.

The estimated Order of Magnitude Construction Cost only for this Alternative was over $5,000,000.

The study stressed that the Hooper and Sullivan Roadway Widening Project was not yet in preliminary design hence the new right of way has not been determined or acquired so the final sewer layout could not made. PEC recommended that the East Baton Rouge Parish Green Light Program team be worked with closely to accelerate this process and necessary right of ways for both the roadways and the sewer program (gravity lines, pump stations, and force mains) be purchased concurrently.

Service Type: Wastewater Collection and Treatment
Project Name:   Pump Station Hydraulic Relief Program - Rollins Road and East Side Pump Station/Force Mains
Project Location Zachary, LA
Client:   City of Zachary
Estimated Const. Cost: $2,000,000
Funding Sources: Local Funds

The City hired PEC to undertake the design of two new submersible pump stations (1,560 gpm and 550 gpm) capacities and associated new force mains to relief hydraulic surcharging of existing collection systems in the Central area of Zachary. Hydraulic analysis was coordinated with and subsequently approved by EBR City Parish wastewater collections. The pump stations discharge into the existing City Parish interceptor system. Three new force mains (21”-10” - 720 lf, 16”- 7,900 lf, and 10” -1100 lf) and related routes were investigated and designed to assist in transporting peak flow conditions. New pump station site locations, ROW and servitudes were investigated and obtained at optimum station locations to minimize sewer tie in logistics.

Preliminary and final engineering and preparation of plans and specs were done in accelerated program of design. The coordination and approval of all projected flow capacities and line hydraulics with the EBR Parish sewer collection system design group was a key facet of the project’s planning efforts.

Service Type: Wastewater Collection and Treatment
Project Name:   Westport Wastewater Treatment Plant Expansion
Project Location Port Allen, LA
Client:   West Baton Rouge Parish Council
Estimated Const. Cost: $750,000
Funding Sources: Local Funds

PEC was retained by West Baton Rouge Parish to provide engineering services to increase the capacity of the existing 300,000 gpd extended aeration WWTP serving the Westport area. This section of the Parish is a mixed used commercial/ industrial area with multi-family complexes. The area was projected to increase dramatically in growth requiring a 100,000 gpd addition. The existing plant discharged into the Intracoastal Canal which has a 10/15 ppm BOD and TSS discharge requirement.

PEC evaluated the various options for increasing the plant’s capacity from expanding different process units to providing totally new components. The existing pump station was determined to have sufficient capacity to meet the new projected peak flows of an estimated 1.6 MGD peak hourly flow. The expansion of the existing extended aeration plant was determined to not be cost effective so a new activated sludge plant was designed as a stand alone system. Both the old and new plants used gaseous chlorination but flows were comingled to a common flow monitoring and discharge point. The plant’s final configuration was based on the potential economics of reuse/expansion of existing structures or construction of new process units.

The firm designed a combined tertiary filter system for both facilities for the potential of more stringent permit limits in the foreseeable future. This unit process was not constructed at this time.

Service Type: Wastewater Collection and Treatment
Project Name:   Zachary Wastewater Master Plan
Project Location Zachary, LA
Client:   City of Zachary
Estimated Const. Cost: $38,000,000
Funding Sources: Local Funds

PEC was retained to prepare a 201 Facilities Plan/Master Plan for the City of Zachary to assist in the future planning requirements for how the community will process its wastewater flows.

PEC initially established the planning constraints, clarified issues that would impact planning decisions and gathered clear foundation for the development of the alternatives for regional wastewater facilities or continued use of the existing City Parish sewer system. Current Parish and State resources for growth planning, current and future zoning and land use plans, transportation plans, census data and any previous master planning or infrastructure planning reports were utilized to update existing and future population estimates. Population projections were coupled with current residential and commercial concentrations to develop future wasteload projections.

One of the initial key tasks performed was to evaluate existing wastewater facilities in the City to determine available and potential capacity and the ability to meet current and anticipated future regulations.

The second primary task was to identify viable wastewater treatment technology alternatives and feasible wastewater facility locations.

The facilities alternatives analysis task formed the core of the technical effort to identify and evaluate viable options for wastewater treatment and collection. The PEC Team focused on viable wastewater treatment techniques for both liquid and solids stream processes that were both practical and economical to operate. Conventional and innovative treatment processes were assessed to be “tried and true” for practical, cost-effective application in the City. Treatment processes were evaluated for adaptation to future effluent discharge restrictions that may require stricter effluent limits or control of additional pollutants. Facility location alternatives were assessed to be centrally located, economical, environmentally sound and acceptable to stakeholders.

The firm evaluated treatment processes and related routes for discharge to local receiving streams and to the Mississippi River. Each alternative was evaluated for its cost effectiveness based on the Present Worth of its Capital and O&M costs and related community and environmental impacts.

An implementation plan for the proposed design and construction of the facilities was prepared along with the financial requirements to undertake the estimated $38,000.00 project.

Service Type: Wastewater Collection and Treatment
Project Name:   Southern University Multi Process Wastewater Treatment Plan
Academic Training Center Feasibility Study
Project Location Scotlandville, LA
Client:   Southern University
Estimated Const. Cost: $13,000,000
Funding Sources: Local Funds

The Louisiana Department of Environmental Quality (LDEQ) required the services of Southern University to provide oversight to a professional engineering firm to create a feasibility study to construct a multi-process wastewater treatment facility. The treatment plant would provide wastewater treatment for the University campus, and provide training for civil engineering students and small wastewater operators through out the state. The multi process wastewater treatment plant would not only serve as an educational training facility, but potentially could reduce the university’s overall cost of utility operations. PEC was retained by Southern University as a consult to assist in performing the Scope of Services of the study.

The intent of the document was to determine the feasibility of undertaking this project from “its impact on the University programs” to “the identification of it as a viable training center for students and statewide wastewater operators”. The document was prepared with key Southern University facility plant and faculty input. Additional stakeholders in the associated community and City/Parish officials were coordinated with to understand the intent of the facility and to mitigate local constituency environmental concerns. A Technical Advisory Committee composed of wastewater consultants, DHH and DEQ officials, educators and trainers guided the overall program development. The scope of work consisted of, conceptual planning and alternative formulation, preliminary engineering, an economic and financial analysis, funding source identification, academic program outline and training goals, and an implementation approach.