EVENTS NEWS HOME
WHO WE ARE WHAT WE DO HEALTH & SAFETY TECHNICAL RESOURCES CONTACT US
bio-polymer-trenches
Vertical Barriers/Slurry Walls Bio-Polymer Trenches Permeable Reactive Barriers Soil Mixing Jet Grouting Wetlands Site Remediation Dam Grouting MGP Sites Levee/Dam Reinforcement & Repair
 

Collection of Contaminated Groundwater


Elkton, MD: Bio-Polymer Slurry Wall, Former Maryland Sand, Gravel And Stone Site

bio-hdpe-vertical-barrier-installation-elkton-md

The site, originally a 150-acre sand and gravel quarry, began receiving industrial and solvent recycling wastes in the late 1960's and early 1970's. Complaints from local residents eventually led to investigations and closure by the EPA. The site was put on the National Priority List (NPL) for superfund sites in 1984 and over 200,000 gallons of liquid waste was removed.

Geo-Con was contracted to install a groundwater interceptor trench by the bio-polymer slurry trenching method to provide groundwater collection and treatment, in conjunction with several existing trenches, to intercept contaminated ground water traveling from the waste areas to surrounding fresh water sources.

The interceptor trench was 310 linear feet long and excavated 38 feet deep to the existing confining clay layer. Bio-polymer slurry was produced in Geo-Con's high speed/high shear colloidal batch plant and piped to the trench via hoses. The 4-foot wide trench was excavated using a CAT 385 excavator equipped with Geo-Con's custom-made long-front attachment and trenching bucket.

Non-woven filter geotextile was placed in the trench to completely encapsulate the 1/2-inch size washed gravel backfill. The trench contained two extraction sumps. The sumps were excavated to a total depth of approximately 38 feet below ground surface with a precise 1 to 1 slope from trench bottom to sump bottom. The sumps consisted of 20-inch ID stainless steel .020-slot well screens and risers.

To achieve the objective of the project, Geo-Con monitored the slurry properties continuously during construction to prevent premature slurry degradation. Geo-Con modified the standard chemistry of the fresh slurry to compensate for the constant influx of contaminated groundwater.



 

Corporate Headquarters: 1250 Fifth Avenue • New Kensington, PA 15068 • 724-335-7273

© 2014