WATER RESOURCES

Our staff is highly skilled in the technical and non-technical aspects of water resources; hydrology, hydraulics, streambank stabilization, and floodplain management. TAI’s staff has completed all facets of planning, design, permitting, and construction oversight of stormwater projects ranging from simple parcel-scale stormwater Best Management Practices (BMPs) to large scale watershed planning projects.

Hydrology

Hydrology is the analysis of the impacts of different rainfall events on the surrounding land usage. Our staff utilizes historical and trending data to determine the capacities of existing drainage systems to develop recommendations of improvements to the existing system and identification of flood prone areas. These analyses are done internally using the latest methods and programs including Rational Method, SCS, SWMM, HEC HMS among others.

Hydraulics

Like hydrology only under pressure.


Control and conveyance of the hydrology of the land usage for the protection of private property. Over the years, hydraulics has evolved from the mindset of out of site, out of mind to Low Impact Developments (LID) in order to encourage the recharge of groundwater aquifers and to remove oils and other Total Suspended Solids (TSS) while increasing vegetative uptake of vital nutrients.

Streambank Stabilization

Over the years it has been identified that hard armor such as concrete, rip-rap, and gabions have proven ineffective in reducing erosion along shorelines, embankments, and outflow structures. The incorporation of sustainable practices, such as native plantings, deep root vegetation, engineered planting structures, and the elimination of well-defined channels has shown potential in controlling erosion while improving conveyance of these areas.

Floodplain Management

Over the years floodplain management has moved towards mitigation and protection resulting from prior urbanization in order to contain and distribute high risk events. Our experienced floodplain managers recognize the protection of property as the highest priority, while enhancing vital aquatic systems.

Regulatory Agencies

Trotter and Associates, Inc. is well respected by regulatory agencies, and is able to readily resolve hurdles associated with permitting. TAI also has an excellent relationship with local permitting municipal engineers and is confident in our ability to expedite the local stormwater application and permit requirements.


  • Lake County SMC
  • McHenry County WDO
  • Kane County Stormwater Management Ordinance
  • DuPage County Stormwater Management Ordinance
  • Will County Stormwater Management Ordinance
  • Kendall County
  • MWRDCG WMO
  • City of Chicago SMO
  • USACOE
  • EPA
  • IDNR

  • HYDROLOGY

    Hydrology


    Hydrology is the analysis of the impacts of different rainfall events on the surrounding land usage. Our staff utilizes historical and trending data to determine the capacities of existing drainage systems to develop recommendations of improvements to the existing system and identification of flood prone areas. These analyses are done internally using the latest methods and programs including Rational Method, SCS, SWMM, HEC HMS among others.

  • HYDRAULICS

    Hydraulics


    Like hydrology only under pressure.


    Control and conveyance of the hydrology of the land usage for the protection of private property. Over the years, hydraulics has evolved from the mindset of out of site, out of mind to Low Impact Developments (LID) in order to encourage the recharge of groundwater aquifers and to remove oils and other Total Suspended Solids (TSS) while increasing vegetative uptake of vital nutrients.

  • STREAMBANK STABILIZATION

    Streambank Stabilization


    Over the years it has been identified that hard armor such as concrete, rip-rap, and gabions have proven ineffective in reducing erosion along shorelines, embankments, and outflow structures. The incorporation of sustainable practices, such as native plantings, deep root vegetation, engineered planting structures, and the elimination of well-defined channels has shown potential in controlling erosion while improving conveyance of these areas.

  • FLOODPLAIN MANAGEMENT

    Floodplain Management


    Over the years floodplain management has moved towards mitigation and protection resulting from prior urbanization in order to contain and distribute high risk events. Our experienced floodplain managers recognize the protection of property as the highest priority, while enhancing vital aquatic systems.

  • REGULATORY AGENCIES

    Regulatory Agencies


    Trotter and Associates, Inc. is well respected by regulatory agencies, and is able to readily resolve hurdles associated with permitting. TAI also has an excellent relationship with local permitting municipal engineers and is confident in our ability to expedite the local stormwater application and permit requirements.


    • Lake County SMC
    • McHenry County WDO
    • Kane County Stormwater Management Ordinance
    • DuPage County Stormwater Management Ordinance
    • Will County Stormwater Management Ordinance
    • Kendall County
    • MWRDCG WMO
    • City of Chicago SMO
    • USACOE
    • EPA
    • IDNR

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RELATED PROJECTS

Batavia WWTF Phase I Rehabilitation
By Mark Dupree 04 May, 2022
The City of Batavia is located along the Fox River in southern Kane County, approximately 35 miles west of downtown Chicago. The City’s Wastewater Treatment Facility (WWTF) is located on Shumway Avenue on the western shore of the Fox River. The treatment facility has a design average treatment capacity of 4.2 million gallons per day (MGD). The facility provides preliminary, primary, and secondary treatment for flows received from the tributary communities to meet strict effluent water quality requirements before discharging to the Fox River. The Batavia WWTF was required to comply with a 1 mg/L phosphorus limit. It was likely that the treatment facility will need to achieve lower phosphorus effluent limits prior to 2030. In addition, the Batavia WWTF will require additional capacity in the near future and must be expanded to 4.9 MGD. This expansion triggers the anti-degradation portion of the 2004 IEPA nutrient removal criteria. Therefore, the expanded treatment facility must be able to perform nutrient removal for both nitrogen and phosphorus. This was analyzed with the 2014 Facility Plan and Phosphorus Removal Feasibility Study, which recommended a three-phased approach to meeting the needs of the WWTF. Phase I included rehabilitation of the excess flow disinfection system. The existing chlorine feed system was installed in 1989 within the Chlorine Building and was an operational challenge. The system was replaced with a liquid sodium hypochlorite delivery system, including chemical storage tanks and a duplex skid-mounted diaphragm pump feed system within the existing Chlorine Room. The finished floor of this building is below the floodplain of the Fox River, and this is particularly sensitive as the building contains the emergency back-up generator for the WWTF. Therefore, all entrances to the building were retrofitted with stop logs that may be installed during flood events. Chemical phosphorus removal was also implemented in the Phase I project. The chemical storage and feed systems were installed as a separate structure, including rammed-aggregate piers, retainage walls, base slab, two chemical storage tanks, and a climate-controlled enclosure for the pumping equipment. The chemical is fed within the effluent box of the Nitrification Basins to optimize mixing and capture of the phosphorus prior to settling in the final clarifiers. The Phase I Rehabilitation included the replacement of the Intermediate Pump Station. The design of the new pump station accounted for the tankage and hydraulics required by the existing biological process as well as the future hydraulic conditions from the Phase II Expansion. The Intermediate Pump Station was incorporated into the design of the new Digester Operations Building and contains four 100 HP submersible pumps in a dual wet well design. The City stabilizes biosolids with two 40-foot diameter anaerobic digesters. The Phase I Rehabilitation included replacement of both digester covers, the digester mixing systems, and the digester heating systems. The floating digester covers were replaced with spiral-guided, gas-holding covers to provide the City with nearly 12,000 cubic feet of digester gas storage. The new Main Building was constructed on land occupied by the existing Administration Building. That building housed the laboratory, administration offices, maintenance garage, and locker rooms. The new structure has 22,000 square feet of working space including a mezzanine within the new Maintenance Garage. The new building also contains administrative offices, laboratory, locker rooms, SCADA stations and the new main electrical service for the WWTF. This building also contains sludge dewatering operations, including digested sludge storage, centrifuge feed pumps, polymer feed systems, centrifugal dewatering equipment, dewatered sludge conveyors, and protected water systems. Due to the proximity of this building to downtown and nearby residences and businesses, the City also made a significant investment in odor control for the digested sludge storage and sludge dewatering areas.
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