This is an example of what an outfall would look like. This actually isn’t one that the county maintains, but my boss and I use it an example because it was out and exposed enough for a photo. Some of the outfalls were more hidden and tucked away in the more forested kind of areas and didn’t have the nice head wall. (Credit: Robert Lentz)
For ten weeks, from mid-June to mid-August of this year, University of Dayton Environmental Biology major/English minor Tessa Farthing learned how to go out in the field and assess the health of stormwater inlets and outfalls in various places in Butler County, a 470 square mile area between the cities of Dayton and Cincinnati in southwestern Ohio. Not only was she trained in how to find inlet and outfall areas, which was sometimes challenging in and of itself, she was also trained to use some very sophisticated equipment. For some of the tasks she needed to do, however, it was the not-so-technical equipment that ruled the day. In addition to everything else, Farthing says, she was trained how to use her nose.
“At Butler County, I learned that your nose is an important part of gathering data in the field,” Farthing explains. “Sometimes what you smell can be a valuable piece of information when assessing a stormwater area. For example, a sulfur smell can mean there’s a sewage issue nearby. But the smell is just one piece of information that goes into a site assessment.”
For field equipment, Farthing typically used: a Trimble GPS receiver, a tablet with an ArcGIS application and a survey collector application, gloves and a flashlight.
Farthing also assisted with lab testing. While she primarily assisted with nitrates and phosphorus testing, she was also trained on all the other lab equipment used by the Storm Water District’s Butler County Stream Team. The Storm Water District was created in order to comply with the mandated CWA’s National Pollutant Discharge Elimination System (NPDES) Phase II for MS4 systems. The program is in place for thirteen member communities: Fairfield Twp., Hanover Twp., Lemon Twp., Liberty Twp., Madison Twp., Millville, New Miami, Ross Twp., Seven Mile, St. Clair Twp., Trenton, Wayne Twp. and West Chester Twp. For nitrates analysis, lab equipment used included: HACH DR2800 Spectrophotometer, micro-pipettes, Hach TNT plus 835 kits, Kimwipes, gloves, alcohol swabs and a timer. For phosphorus analysis: the spectrophotometer, pipettes, timer and sterilizing equipment, heating block and Hach TNT plus 843 kits.
Other analyses included bacteria monitoring (E. coli/total coliform). Lab equipment needed for bacterial monitoring included an Isotemp forced air incubator, autoclave ultrapure (type 1) water, colilert kit/quanti-trays, quanti tray sealer and UV lamp.
Conductivity, turbidity and total dissolved solids were also monitored. For conductivity, a conductivity meter, stir bars/plate and a standard are used. Turbidity monitoring required a LaMotte 2020 turbidimeter, stir bars/plate, and a standard. The Total Dissolved Solids (TDS) tests used the same equipment as the conductivity tests.
“While I wasn’t in the lab as much as the field, the Stream Team volunteer program is an important component of the Storm Water District, and they are an Ohio EPA Level 2 Credible Data approved program, which follows very specific procedures in order to output credible data,” Farthing notes.
One of the tasks Farthing was involved with was dry weather screening, where after a 72 hour period with no rain, outfall sites are checked. Nothing should be coming out of the outfall sites in those cases, and if something is, then that is a cause for concern.
“I also learned to use my nose and my eyes to help determine what film layers were, if found and whether it was something unusual. I learned what different types of films looked like. There are clues to determine, for example, if you are looking at a biomass or oil film,” says Farthing. “Color can also be a clue. Clear discharges that seem to be killing off algae or fish (algicides) can be from pool chemicals. A large algal growth at an outfall can mean fertilizer has been discharged there.”
One of her biggest tasks of the summer was creating a manual describing where inlet and outfall sites are using GIS mapping of the area with a Trimble GPS receiver. She took specific coordinates and filled out forms, a process that will make it easier for future researchers to find discharge sources. “You might think it would be obvious where inlet and outfall sites are,” she says. “But in reality, they can be well hidden and hard to track down. They can be well hidden in wooded areas and other places.”
To find inlets and outfalls to study each day, Farthing chose sites that also needed mapped and located. After traveling out to the site, Farthing looked over the area and tried to topographically visualize where water might flow.
“If you have a stream or a creek, you’re usually looking for a corrugated pipe or plastic pipe with rock channels. That’s likely to be an outfall. Inlets, on the other hand, are places where rainwater initially collects,” Farthing notes.
Farthing worked with Lynn White (Butler Soil and Water Conservancy District), Tera Ratliff (Miami University, Research Associate), Robert Lentz (Storm Water District), Theresa Barnes (Storm Water District), and various volunteers and lab assistants to conduct the laboratory tests.
In the Engineer’s Office/Field: Robert Lentz is the Butler County Storm Water District Coordinator, Eric Pottenger is the Development Services Manager, Theresa Barnes, P.E. is a design engineer in the stormwater department and Jody Bohn is the stormwater inspector. The county engineer is Greg Wilkens, P.E., P.S.
“Everyone that I worked with in the Engineer’s Office and Stream Team was exceptional. They taught me so much about civil engineering in regards to the environment, stormwater, and source water protection,” Farthing enthuses.
Along with her co-workers, Farthing also enjoyed the fieldwork that was integral to her ten-week internship. “I enjoyed doing the mapping and being outside. There were so many beautiful sites. Some very nice wetlands. I highly encourage people to get into the environmental biology field. There are a lot of young people joining right now as well as older people who have had other careers before. There’s a lot of work to do and a lot of need for more people. It’s a great field to get into.”
Top image: This is an example of what an outfall would look like. This actually isn’t one that the county maintains, but my boss and I use it an example because it was out and exposed enough for a photo. Some of the outfalls were more hidden and tucked away in the more forested kind of areas and didn’t have the nice head wall. (Credit: Robert Lentz)