1. Confirm the year and approximate acreage of the land sold to Lafarge?

The area sold to LaF arge was 88.3 acres per attached dwg # H

- 0515

- D

- 01

- 000000.

2. Please provide the chloride content of the coal?

C hlorine of the As

- received coal has been in the 0 .17 % range

.

3. If you converted, would you modify the existing boilers or install new units for the change to natural gas? If installing new units, would you install combined cycle units?

This is in the feasibilty study stage. Unknown at this time.

4. Seminole required to do any groundwater monitoring around the percolation ponds?

Yes, there are four monitoring wells downgradient from the percolation ponds that are monitored quarterly.

5. Please provide an estimate of the reduced thermal energy losses realized after installing the DRYCONTM system.

20 million btu/hr per the 2009 Burns & McDonnell project study report attached

.

6. Please provide the moisture content of dry bottom ash.]

7. Please provide data on the specific cost savings experienced from converting from the wet sluicing system.]

The following data is from the attached 2009 Burns & McDonnell dry bottm ash project study summary of O&M cost savings: 1.) Electrical p ower cost savings = $459,000/year/Unit , 2.) Maintenance c osts $300 ,000/year/Unit, 3.) Spare parts use = $216,000/year/Unit, 4.) Make

- up water $68,000/year/Unit

, and 5.) recovered thermal energy cost = $400 ,000/year/Unit

.8. The design maximum chlorides level is 20,000 ppm. Seminole sends blowdown to the wastewater treatment system constantly at a rate of 850 GPM. Please confirm that the plan blows down con tinuously at a rate of 850 GPM?

The system has been permitted to blowdown at 800 gpm but is not currently capable of that flow rate. Maximum rates are approximately 550 gpm but typically average around 500 gpm.

9. Please provide the total flow from the supernatant tank to the treatment system, recycled back to the scrubber, and to the pond system.

Water to be treated in the FGD blowdown system is drawn off in batches for treatment, ~24,000 gals. per batch, averaging ~32 batches per day. Supernate from the Thickener overflow tanks is pumped back to the FGD system continuosly for use in those systems . Any overflow back to the ponds is dependent on the FGD system demand. Rain fall also impacts that as that is fresh water introduced in the system via any containment that the FGD system would capture thus becoming part of the scrubber bleed/supernate loo p.

10. Seminole sends samples of the influent to the batch reactors to a laboratory to measure selenium concentrations using atomic absorption. Selenium concentrations at the influent to the batch reactor can range from between 180 ppb to 400 ppb. The treatment system reduces the selenium levels in the wastewater to 20 ppb and less. Historically, Seminole has observed 98 percent selenium removal. [QUESTION FOR SEMINOLE: Please confirm the 98 percent selenium removal

.
The data for 2013 indicates an avera ge of 96.2% removal with a range from 94.5 % to 98.0%.

11. Please provide the flow rate from the batch reactors to the clarifier.

The discharge rate from each Reactor is approx. 1200 gpm when pumping to the Clarifier.

12. How often do you dewater the F GD sludge with the filter presses? Why do you use the fly ash to stabilize the FDG solids instead of selling the fly ash and dewatering the FGD solids in the filter presses?The filter presses are operated 2 to 4 days per week depending on the sludge bed l evel in the FGD Blowdown Treatment Clarifier. Presently that is the only means to landfill the FGD treatment system sludge, due to it’s properties even after using the filter presses still requires stabilization with Fly Ash. The moisture content from the presses is in the 70% range.

13. Please provide some information on iron cycling? What type of negative effects could iron cycling have on the gypsum?

We have not performed those studies as yet but we are concerned about color of the gypsum produced.

14. Do you have any sampling results for dissolved mercury in the system? Was the 50 percent reduction in mercury concentrations based on bench scale testing, pilot scale testing, theoretical calculations, or another basis?

A vendor took the only data we h ave ever developed and we cannot locate the information. We will contact the vendor and see if we can come up with this information as soon as possible.