MUS-93-12.92 Mine Void Grouting – 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.