February 28, 2017 Report
Global English [ Change Region ]

February 28, 2017 Report

February 28, 2017   |   ShareThis

Listening to our Community

Answering questions from the community is very important to Mosaic Fertilizer. Come here often to see how we are addressing frequently asked questions.

Q: Where was the 1994 sinkhole and how was it repaired?

In 1994, the now-closed north New Wales gypstack experienced a sinkhole. IMC, Mosaic’s predecessor, remediated the sinkhole through a grouting process, and those activities were subject to the oversight of regulatory agencies.

In the years since that incident, Mosaic Fertilizer has monitored the area where the sinkhole occurred. We continue to collect groundwater data and provide monthly reports to FDEP and Polk County.

The monitoring system which was installed following that event proved its effectiveness in 2013 when it indicated a water level drop in the north gypstack. Those measurements prompted the company to investigate, and we learned that a two to three foot-wide sub-surface erosion channel had developed in the vicinity of the 1994 sinkhole. The erosion channel was then filled with grout injected at high pressure.

The groundwater monitoring data downgradient from the 1994 sinkhole location now spans more than two decades and continue to show no signs of offsite impact and continued improvement in water quality.

We’ve learned a great deal from the 1994 incident and are supplementing that knowledge with new technologies such as LiDAR to expedite the remediation and hone our grouting methods. Extensive site-specific data at and near the New Wales site have also been used to calibrate groundwater flow models, aiding in our understanding of the water flow in the aquifer towards the recovery well.