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ENVIRONMENTAL CONSTRUCTION AND REMEDIATION Shallow Soil Mixing Geo-Con recently completed a site remediation consisting of stabilizing approximately 0.5 acres of land within a residentially zoned area near the center of town in Exeter, New Hampshire. The site was the location of a former Manufactured Gas Plant (MGP) where the processes generated the release of coal-gasification related material including, but not limited to, volatile and semi-volatile organic compounds. This particular site contained free product of benzene and naphthalene within 3 feet of the surface. As a result of extremely close proximity to a retirement home, day care facility and dormitories for a boarding school, noise and odor were of the highest concern.
The client's onsite engineer, ThermoRetec, handled public relations with the community and the state regulatory agencies directly. Town meetings were held for local residents throughout the project to answer questions and deal with any community concerns. Geo-Con administered noise and odor control measures during the entire project. Noise reducing equipment or equipment modification from diesel to electric was incorporated wherever possible. Perimeter fencing with foam padding was also used to screen and divert sound upward. Odor control was established by ensuring constant application of reducing agents to the disturbed areas and soil material.
The limits of the stabilized area involved an irregular shaped area encompassing approximately 11,000 sf on the northern portion of the property. Approximately 7,900 cy of impacted soil were stabilized in-situ utilizing a combination of jet grouting and Geo-Con's Shallow Soil Mixing (SSM) technologies. Jet grouting was used for perimeter stabilization (˜ 510 lf), while SSM was used for interior stabilization. Reagents used for stabilization included city water, Type I Portland cement, organophillic clay and sodium bentonite.
Geo-Con personnel successfully executed the project with no incidents, while handling a confined work area, obstructions, and nearby community concerns. Geo-Con worked closely with ThermoRetec to achieve this utility client's needs.
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