McFadden Engineering is a fast growing firm and serves many municipalities and agencies across the southeastern United States. Some of our clients include the US Army Corps of Engineers, City of Robertsdale, Alabama, and the Mobile Area Water and Sewer System.

Our company continues to strive in providing the best possible service knowing that it builds our reputation with every project we undertake.

We invite you to explore our completed projects from across the southeastern United States and see what McFadden Engineering has to offer.

Fruitdale High School Sand Filter

Washington County, Alabama

Fruitdale High School is located in the southwestern portion of Washington County, Alabama. Fruitdale High School is a kindergarten through 12th grade unit school that currently has an enrollment of 426 students. The school is situated across 25.0± acres approximately 1.5 miles northwest of the Escatawpa River. The school has a series of manholes that collect wastewater from the school campus and route it to a three-cell lagoon system. In 2009, the treatment system began experiencing difficulties in meeting its permitted limits. McFadden Engineering was retained by the Washington County Board of Education to review the existing treatment process and determine options to achieve compliance.

FruitdaleSandFilterIt was determined that the existing lagoon system was no longer sufficient to meet the permit criteria. McFadden Engineering began the design of a single pass sand filter to further treat the wastewater of the facility. Single pass sand filters have been used for wastewater treatment in the United States since the late 1800s. They are a viable option as an addition or alternative to conventional methods when site conditions are not conducive for what might be considered more conventional methods of treatment and disposal of wastewater.

The sand filter was installed downstream of the existing lagoon system to polish the effluent prior to discharge to an unnamed tributary to the Escatawpa River. The physical location of the sand filter is east of the third lagoon at the high school on the southeastern portion of the school’s property.

The system assists in treating the water by filtration, chemical sorption and assimilation. The system’s application area is 42 feet long by 40 feet wide. The Fruitdale High School filter is a deep bed filter with carefully graded layered media. The surface of the bed is intermittently dosed with effluent that percolates in a “single pass” through the sand to the bottom of the filter. After being collected in the underdrain, the treated effluent is transported by a gravity line to the systems existing discharge structure.

The sides of the filter are earth berms constructed on a 2:1 slope and shaped from clay material. The inside of the filter is lined with a 20-ml polyethylene liner to contain the effluent and prevent discharge of the effluent via percolation to groundwater. The underdrain is 6-inch slotted PVC pipe and is surrounded by an 8-inch layer of #57 stone with the upstream end brought to the surface to act as a cleanout and vent for the system. A 24-inch layer of sand is laid on top of the layer of stone. A lightweight permeable geotextile filter fabric has been placed between the gravel layer and the sand layer to keep silt from moving through into the gravel while allowing air and water to pass.

To regulate the number of doses to the field during a 24-hour period, a 1,100-gallon dosing tank has been placed in line prior to the pump station wet well. The pump then pressurizes a 1.5-inch supply line and transports the water to a 1.5-inch PVC manifold. The system then pressurizes the 3/4-inch PVC distribution lines and the effluent is evenly distributed over the application area.

McDuffie Coal Terminal Fugitive Dust Best Management Practices

Mobile, Alabama

McDuffieBMPThe Alabama State Port Authority (ASPA) retained McFadden Engineering to assist the ASPA and specifically McDuffie Coal Terminal in developing measures and best management practices to minimize fugitive dust emissions from the facility.

The facility uses 80 acres of the property as bulk storage. Coal is currently the only material that is handled at the facility. The McDuffie Coal Terminal operates as a dry material handling facility with coal loading and unloading, material transfer operations, material storage and product transportation operations being the main activities conducted at the site.  The facility has three berths in which vessels can dock to deliver their cargo (i.e. coal) to the facility. In conjunction with these berths, the facility has two ship loaders, three ship unloaders, three barge loaders, and two barge unloaders, which allow access to a detailed conveyor system and rail system within the McDuffie Coal Terminal facility to distribute the material to the storage area.

McFadden Engineering reviewed facility information and met with facility personnel to gain an understanding of the operational activities that could potentially cause fugitive dust at McDuffie Coal Terminal so that Best Management Practices could be developed and implemented at the facility. McFadden Engineering assisted in developing a Best Management Practices plan for fugitive dusts generated from activities at the site.

Mobile Memorial Gardens

Mobile, Alabama

McFadden Engineering has been the consulting engineer for Mobile Memorial Gardens since 1990, assisting with the Gardens with all their civil engineering needs.  Mobile Memorial Gardens is 200 acre cemetery located in central Mobile County at 6100 Three Notch Road.  MEI has performed numerous projects for the Gardens over the past three decades, including:

  • Civil site design services for the construction of a funeral home and mausoleum
  • Design of an irrigation system for the facility including the design, sizing and construction management of a water well for irrigation purposes
  • Design of storm water control structures including detention ponds and discharge structures with aesthetics that match the theme of the gardens
  • Design of wastewater disposal options and permitting for the funeral home
  • Provided engineering services for a sewage pump station at the facility
  • Development of a GIS system for the Gardens and assistance with overall infrastructure and cemetery master planning for the facility
  • Provided boundary layout and grave plot layout for proposed Veteran’s Garden using GIS system to translate coordinates to ground markings for construction purposes
  • Provided engineering and permitting services for maintenance building expansion
  • Assisted with general layout of roadway expansions throughout the facility
  • Acted as the Garden’s consulting engineer on right-of-way issues and concerns related to county roadways and adjacent properties

ABC Board Warehouse and Building Design

Mobile, Alabama

McFadden Engineering was retained by a development team for the Alabama Alcohol Beverage Control Board (ABC) to develop a 10,000 square foot warehouse and building design for their Mobile, Alabama operations. The facility was located on a 2-acre site within the city limits of the city of Mobile. McFadden Engineering performed all site design services and associated permitting through the City of Mobile and Alabama Department of Environmental Management (ADEM).

The building is a concrete masonry structure with architectural enhancements per the ABC Board’s specifications. McFadden Engineering was responsible for site civil design work, including:

  • Utility layout, design and connection to new facility;
  • Stormwater conveyance to existing stormwater detention area;
  • Site grading and drainage;
  • Overall site design.

This project was completed within a three month time period, well within the project schedule and budget, allowing the ABC Board to begin operations in their new facility within the designated timeframe for the project.

GIS Conversion and Field Data Collection

Mobile, Alabama

Mobile Area Water and Sewer System

As a subconsultant on the project, McFadden Engineering obtained sub-meter locations for all interceptor and non-interceptor manholes, as directed prime, contained in the sanitary sewer collection system. McFadden Engineering collected additional data, including:

  • Rim elevations
  • Invert elevations
  • Invert pipe sizes
  • Discharge force main sizes
  • Manhole diameter
  • Manhole depth

Bay City Free Will Baptist Church Parking and Drainage Upgrade

Semmes, Alabama

new-parking-lotBay City Free Will Baptist Church (BCFWBC) is a growing church in Semmes, Alabama adjacent to Mary G. Montgomery High School. The church is used as overflow parking for football games and other school and community events. The current parking lot was grass and standing water, especially after rain events, had become a concern to the church staff.

In 2015, BCFWBC retained McFadden Engineering to develop a parking area and upgrade the site drainage. McFadden Engineering worked with the city of Semmes, Alabama to develop a commercial site plan design that old-parking-lotprovided 70 parking spaces for the church in front of the worship facility. A new detention pond was also designed and constructed to capture stormwater runoff from the parking area. In addition, culvert pipes for the two existing access driveways to the church were upgraded to meet Mobile County, specifications.

Threaded Fasteners, Inc. – Facility Expansion Project

Semmes, Alabama

Threaded Fasteners, Inc. (TFI) has an Threaded-Fasteners-1existing facility located on a nearly 4.50-acre parcel off Schillinger Road North in Semmes, Alabama. TFI acquired a 10-acre parcel to the east of the existing manufacturing facility. McFadden Engineering was retained by TFI to provide planning and engineering services to expand its current operation by developing a portion of the 10-acre parcel for construction of an additional facility for a galvanizing operation. McFadden Engineering assisted TFI with site design and layout, grading and drainage design, and design of a detention facility that would allow for additional facility expansion . McFadden also handled all permitting through the city of Semmes and the construction stormwater permitting with the Alabama Department of Environmental Management (ADEM).

The expansion consisted of major site work to compensate for a 15-foot elevation drop between the existing facility and new property. The site was graded and leveled to minimize the amount of fill Threaded-Fasteners-2material that would have to be trucked from an outside source to construct the new facility. Grate inlets were installed to provide drainage around the proposed building and the proposed parking/laydown yard area. The drainage plan also included filling the existing detention pond area at its current facility and expanding TFI’s current material laydown yard area. Drainage infrastructure (stormwater inlets, pipes, etc.) was installed to collect the stormwater currently being collected in the detention area and route it to an existing, natural drainage path on the property. Ultimately, this stormwater was retained in a new, larger detention area prior to being discharged via its natural drainage way.

McFadden Engineering assisted TFI with coordination of utilities for the new site with local utility companies and assisted the site contractor with implementation of erosion control measures to protect adjacent properties from stormwater runoff and ADEM permit compliance.

Coast Seafood UIC Permit and Wastewater Treatment System Design

Coden, Alabama

Coast Seafood, Inc. is an oyster processing plant located on Johnson Road in the Coden community of Mobile County. The company provides services that process (i.e. picking, washing and cleaning) freshly harvested oysters brought on site from Mobile Bay and the surrounding Gulf Coast.

Coast-SeafoodMcFadden Engineering was retained by Coast Seafood after Alabama Department of Environmental Management (ADEM) personnel recommended that the facility update its existing treatment system to one that would remove the high bacteria and biological content that is typically present in waste from a seafood processing facility. In conjunction with this system, since there is no public sewer connection available for the oyster processing facility, the Department recommended an Underground Injection Control (UIC) system be placed onsite to dispose of the treated water.

McFadden Engineering assisted Coast Seafood with addressing these issues by applying for the UIC permit and designing a wastewater treatment system that could address the facilities treatment requirements. As part of the UIC permit application, a soils investigation was conducted to identify a disposal area for the treated wastewater on the property. In addition, McFadden personnel conducted a water well inventory within a half-mile radius of the facility and the proposed injection area.

McFadden Engineering developed a treatment process train that would efficiently treat the water and reduce the bacteria and biological concentrations prior to being injected into the disposal. Project engineers decided to leave existing treatment tanks in place and use them as pre-treatment tanks prior to implementing an attached growth biological treatment system to reduce organic loading in the waste stream. McFadden’s patent pending OxyShark® treatment unit was implemented as the primary treatment unit in the process. Lastly, to address the mitigation of high microbial populations in the effluent and to further reduce (via oxidation) the organic load, an ozone process will be the final treatment before disposal into the field lines.

With the assistance of McFadden Engineering, Coast Seafood received their UIC permit for the facility from ADEM and immediately started construction of the treatment system. The system was brought online in 2015 and has been in compliance with UIC permit limits and requirements since its start-up.

Water Treatment Plan – North Baldwin Utilities

Bay Minette, Alabama

McFadden Engineering was retained by North Baldwin Utilities (NBU) to provide professional engineering and consulting services for preliminary engineering and ADEM permit assistance for a water supply well, water treatment plant and associated appurtenances for a facility located on Drinkard Road in Bay Minette, Alabama. McFadden Engineering reviewed data provided by NBU in regard to the physical, hydraulic and chemical data resultant from a test well program to conceptually design the water supply well and associated treatment facility for the purpose of obtaining an ADEM permit for construction of the facility.

We provided NBU a Preliminary Engineering Report with preliminary drawings, process descriptions, equipment definitions and other associated information as necessary to describe the nature of the proposed facility.  The Preliminary Engineering Report was submitted to ADEM as documentation for the permit application.

Upon receipt of the ADEM permit, NBU retained McFadden Engineering to develop plans to construct a new water treatment plan featuring a 1,000 gpm structure and piping design to be accomplished with an initial treatment process train design of 500 gpm and subsequent additional 500 gpm treatment process train, if required.

McFadden Engineering assisted NBU with the design of the clear well and made recommendations for equipment needed for treatment of the groundwater. We provided design and specifications for all process treatment equipment, service pumps, disinfection equipment and appurtenances for the project. We also developed a site layout and piping diagram for the facility. McFadden Engineering also provided construction observation for the construction of the clear well and assisted NBU with the development of as-built drawings upon completion of the project.

Master Boat Builders Permit for Dredging Activities

Coden, Alabama

Master-boat-buildersMcFadden Engineering was retained by MBB to assist them with the development of a permit application and dredging plan to perform dredging activities in Bayou Coden and remove a portion of the adjacent upland area to widen the channel and thereby make it more navigable.  McFadden Engineering developed a plan for the channel widening activities and development of an adjacent dredge material disposal site. Joint application and notification of proposed activities was submitted to the U.S. Army Corps of Engineers (Mobile District) and the Alabama Department of Environmental Management.

Impacts of the project will be limited to sediment disturbance in Bayou Coden and a tidal marsh disturbance adjacent to the upland area. The sediment disturbance will be mitigated by implementing the proper best management practices (BMPs) at the dredge and disposal site. McFadden Engineering developed a BMP Plan that provided MBB and its contractors details for managing this sediment migration.

MBB received the permit to perform the proposed activities in 2015 and MBB is currently working to implement the dredging plan. These activities, when completed, will provide the community and adjacent businesses (primarily shipyards) greater access to Porterville Bay and Mississippi Sound through Bayou Coden.