Waste-Water Treatment Facility NNC Compliance with Discharge Expansion
A waste-water treatment plant desired to increase their allowed nutrient loading to an urban stream draining to a waterbody under a TMDL. Frydenborg Ecologic characterized the biology, water quality, physical habitat, and land use upstream and downstream of the discharge as part of a Stressor ID study. This study determined that the surrounding highly altered watershed was responsible for failing biology within the stream. By partnering with another firm specializing in modelling, a Level II Water Quality Based Effluent was conducted to determine the allowable amount of expansion without impacting downstream waters.
Characterization of Water Conveyances
A municipality wanted to know the best regulatory pathway for water conveyances within the city limits. Twelve water conveyances were characterized physically, chemically, and biologically, and the three potential regulatory pathways available were explored for their feasibility and cost. A final report was prepared in order to support the course of action decided upon by the city.
Evaluation of a Paper Mill's Discharge Relocation
FDEP required a paper mill to evaluate potential environmental effects due to the relocation of their effluent from a river tributary to the river itself. Frydenborg Ecologic analyzed data collected on behalf of the client by another firm, and interpreted the data with respect to potential exceedances of all biological related water quality criteria, as stipulated by the permit. We found there to be no imbalances in flora and fauna caused by the relocation, and an improvement in the water quality of the tributary following effluent removal. Through our report, reasonable assurance was demonstrated to FDEP.
Biological Assessment of a Creek Following an Acute Toxicity Event
A train derailment caused a phosphoric acid spill into a stream in Northwest Florida. As part of restoration, Frydenborg Ecologic conducted Stream Condition Index sampling at sites upstream and downstream of the spill to determine the long term effect on the fauna. Three months following the spill and restoration efforts, there was no difference between upstream sites and downstream sites, with both locations surpassing the threshold for a healthy community. FDEP concluded that reasonable assurance was met and subsequent monitoring could be discontinued.
Stream Restoration and Mitigation Plan for a Proposed Mine
In order for the issuance of an Environmental Resource Permit (ERP), our firm characterized six seepage streams in a proposed attapulgite mining area. Streams were characterized for biology, riparian buffer, in-stream habitat, hydrology, and geomorphology in order to create a reference point prior to mining activities. A mitigation and restoration plan was designed, and approved by FDEP, to return streams to a lifted state with increased ecosystem functionality post mining activity.