MUS-93-12.92 Mine Void Grouting – Beaver Excavating – Muskingum County, Ohio

STONE was retained to provide a Health and Safety Plan, Work Plan, Phase II Environmental Site Assessment (ESA), and on-site monitoring during a construction project that included the grouting of a mine void near an interstate highway. The mine grouting involved the drilling and injection of cement and flyash grout into abandoned coal mine workings underlying approximately 8,500 feet of interstate I-70 in danger of subsidence damages. The Health and Safety Plan established the necessary actions to protect workers and equipment during the drilling and grouting activities, and incorporated the Work Plan for the sequencing of work and procedures. The site was complicated and constrained due to high traffic flow at the work area, adjacent cemetery and gasoline station, and sequencing of grout trucks.

STONE also provided daily oversight during the production drilling and grouting. Duties included monitoring headspace in workers’ breathing zone using a photo-ionization detector (PID), monitoring explosivity limits in the boreholes, and periodically monitoring headspace readings in the drilling process. Monitoring of water levels also took place.

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I just wanted to reach out to both of you & all of Stone for your outstanding effort, due diligence & professionalism on this project.

I’m certainly no ESA expert, but I was blown away by the detail contained in your report, especially given the tight timeframe that was required for delivery.

Please know that your work at Walnut Grove is very much appreciated by everyone here at POAH.

For the record, I am now a huge fan of Stone Environmental, and I hope we will continue our working relationship well into the future.

Doug Dempsey, POAH