Case Studies - May 2020

Case Studies - May 2020

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GSF system a fit for site with compacted soil

Problem: A two-bedroom home in Lawrence County, Indiana, had a failing system with effluent surfacing around the tank. The site has areas with drainage issues, and previous structures on the property created compaction in the soil in the remaining usable area.  

Solution: The compacted soils were removed and replaced with 20 inches of Indiana Department of Transportation Spec 23 sand. An Eljen GSF (Geotextile Sand Filter) bed system was able to be designed with an application rate of 0.25 gallon per square foot in the available area, and it has less overall height than a traditional mound. The drainfield consists of 24 A42 GSF units installed in three rows spaced 3.5 feet apart. The overall bed dimensions are 41 by 20 feet. The drainfield final elevation is above grade and is flood dosed.

Result: A code-compliant system was installed on the difficult site. The GSF system manages biomat buildup, helping to protect the soils below, and is also able to disperse effluent over the slow soils. 800-444-1359; www.eljen.com.


Combined treatment and dispersal system solves multiple challenges

Problem: A replacement drainfield was needed for a three-bedroom Wisconsin residence on a lot with a seasonally high water table of 36 inches at grade, limited usable space due to compacted soils, and an old, leaking tank that had infiltration issues adding to the drainfield outflow.

Solution: A 450-gpd combined treatment and dispersal Advanced Enviro-Septic treatment system from Presby Environmental was designed by Warren Hohn and installed by Eric’s Septic Service. Sizing was based on 150 gpd per bedroom. Specification of the system enabled a drainfield size reduction and produced better-quality effluent to accommodate the high-water table. The system removes up to 99% of wastewater contaminants without using any electricity or replacement media. The system footprint is a 17-by-32-foot basal area with a 12-by-32-foot treatment area. The installer removed 12 inches of native soil and replaced it with 12 inches of CSS mound sand. The native soil has a loading rate of 0.5, and the AES system allowed loading of the system at 1.0, reducing the footprint.

Result: The engineer found the AES component manual helpful and was pleased with the system footprint reduction achieved. Regulators were happy with the overall system installation process and the quality of the effluent returned to the soils. 800-473-5298; www.presbyeco.com. 



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