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New Wales Water Loss Incident
March 24, 2017 Report
Your Questions and Our Answers
Questions from the community are very important to us. Mosaic Fertilizer will be using the New Wales web page to answer frequently asked questions.
Q: Neighbors have been asking Mosaic Fertilizer to explain how we’ll know the breach in the confining layer, caused by the sinkhole, has been repaired.
Mosaic Fertilizer poured grout in the sinkhole above the confining layer for stabilization purposes. The deeper high pressure grouting will repair the breach in the confining layer. When those efforts are complete, data from monitoring instruments will confirm changes to water levels in the gypstack. Increasing levels will indicate that the breach has been repaired.
March 22, 2017 Report
Update on First Quarter 2017 Well Sampling for Residents within a Four Mile Radius
Environmental Consulting & Technology, Inc. (ECT) is completing the first quarter 2017 well sampling program for residents within a four mile radius of the sinkhole who have requested that sampling.
A few residents who have had their wells previously sampled and qualify for re-testing have not responded to requests to arrange for sampling in the first quarter. Those residents are encouraged to contact Mosaic Fertilizer at (813) 500-6575 by March 24, 2017 to arrange for sampling this quarter.
Private drinking water wells continue to show no impacts from the sinkhole.
March 17, 2017 Report
Management of Recovered Water
Mosaic Fertilizer continues to treat recovered water at the New Wales facility. The first and second phases of the treatment system were commissioned in December 2016 and February 2017, respectively. The system treats impacted water collected from the recovery well by ultrafiltration and reverse osmosis, and complements Mosaic Fertilizer’s existing water management practices.
March 15, 2017 Report
Defining the Terms – Grout
This series will further explain some of the technical terms used in our remediation posts.
This post defines the term: grout, which we use when referring to sinkhole repairs.
Mosaic Fertilizer is drilling angled holes to inject grout that will ultimately repair the sinkhole. Grout mix is a concrete-like material made onsite at New Wales which includes cement, two types of sand and pea gravel.
Currently, Mosaic Fertilizer plans to produce four different grout mixes. Like a recipe in a cookbook, grout must be made with the right amount of each material to achieve the right properties. For example, grout mix previously used to stabilize the upper cavity has different specifications than the grout mix that will be used during the deeper grouting to repair the sinkhole.
In support of these efforts, Mosaic Fertilizer commissioned the onsite batch plant in January 2017. Once the plant was operational, trial mixes (test batches of grout mix) were produced until they met the project specifications.
After the grout is prepared, water and clay are added for lubrication. It is then loaded into a concrete truck where it is mixed for use.
March 10, 2017 Report
Operations Update on Well Installation and Sinkhole Repairs
P-5 Standby Recovery Well Installation
Mosaic Fertilizer successfully installed the P-5 recovery well which is located approximately one-half mile west of the sinkhole. P-5 was installed in accordance with the Consent Order and will provide additional recovery capacity if needed. P-4B remains the only recovery well in operation.
Grouting Update and LiDAR Redeployment
Over the last several weeks, Mosaic Fertilizer deposited more than 10,000 cubic yards of grout to stabilize the upper cavity of the sinkhole. This week, the LIDAR system and other assessment tools were deployed to assess those grouting efforts. The data collected will be used to refine the location of the deeper, high-pressure grouting holes which will be used to repair the base of the sinkhole.
March 7, 2017 Report
Following Through on Our Commitment to Repair the Sinkhole
Tremendous efforts have been made to repair the sinkhole at New Wales. Just last month, Mosaic Fertilizer started the initial phase of grouting, installed additional instrumentation to measure water levels in the gypstack, and commissioned a new recovery well, P4B. And last week, members of the local media were invited to the New Wales facility to review progress and visit the work pad on top of the gypstack. The short video below highlights important steps Mosaic Fertilizer has taken to respond to the sinkhole, and provides additional footage from the recent media tour of the gypstack.
Having trouble viewing the video? Click here.
March 2, 2017 Report
Key Steps in Responding to the 2016 Sinkhole
Mosaic Fertilizer has been diligently working to repair the sinkhole. The “Key Steps in Responding to the 2016 Sinkhole” infographic below provides a snapchat of these efforts. You can also download it here: http://www.mosaicco.com/infographic.pdf
February 28, 2017 Report
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.
February 24, 2017 Report
Recovery Well P-4B Zone of Capture
The below graphic illustrates the modeled zone of capture for the new recovery well, P-4B, which is located immediately west of the sinkhole and is directly in line with groundwater flow in the Floridan aquifer.