Document:

EX-10.23

 Exhibit 10.23 

Certain confidential information has been omitted from this Exhibit 10.23 pursuant to a request for confidential treatment filed separately with the
Securities and Exchange Commission. The omitted information is indicated by the symbol “* * *” at each place in this Exhibit 10.23 where the omitted information appeared in the original. 

December 3, 2010 
 Tony Mathis 

Duke Energy Generation Services 
 526 South Church St. 

Charlotte, NC 28202 
 Process for Managing Surplus
Gypsum by Lafarge and Duke 
 Dear Tony: 
 As
discussed, under the separate gypsum supply agreements between Lafarge North America and Duke Energy, Lafarge’s Silver Grove plant may refuse delivery of complying synthetic gypsum from either the Miami Fort or Zimmer power stations of Duke
Energy. This letter is to clarify a process for such refusal, under these agreements, to enable the parties to manage the surplus gypsum and validate the refused tonnage. The term of this letter agreement will be from the below signed date through
12/31/11, with the option to extend for an additional year(s), as mutually agreed by each party. 
 During the stated term, this letter
agreement provides for a change in the amount of liquidated damages that Lafarge would owe to Duke for not taking gypsum from Zimmer. Without such a change, Lafarge would refuse gypsum from Miami Fort since the liquidated damages are one times the
base price while the liquidated damages from Zimmer are two times the base price. Also, the barge freight from Miami Fort to Silver Grove is * * * more than the barge freight from Zimmer to Silver Grove. However, for certain tonnages, Duke
would prefer to have Lafarge refuse gypsum from Zimmer. Therefore, Duke agrees to amend any Zimmer liquidated damages to be one times the base price less * * *. As a result, Zimmer will be the plant targeted for the initial gypsum refusal,
but Lafarge and Duke will mutually agree to an on-going schedule from which power plant (Zimmer or Miami Fort) refusals of gypsum would be designated. Without such schedule agreement, Lafarge may refuse gypsum from Miami Fort at its option. 

To further accommodate this working relationship the parties agree to the following: 

 

	 	•	 	The liquidated damages under the Zimmer agreement will be amended as set forth above. 

  

	 	•	 	Both the Zimmer and Miami Fort power stations will report the daily production of complying gypsum and non-complying gypsum in an agreed format. 

 

	 	•	 	Both the Zimmer and Miami Fort power stations will report on the quality testing of gypsum in an agreed format. Duke will keep non complying gypsum clearly separate from complying gypsum. 

  
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	 	•	 	Representatives from Miami Fort, Zimmer, and Silver Grove are to conduct a weekly conference call and email exchange to review projected production, actual complying and non-complying production, stockpile quantities,
projected and actual loaded barges, and projected and actual refused tonnage. 

  

	 	•	 	By contract, Miami Fort and Zimmer each have a specified on-site stockpile of complying gypsum available (Lafarge stockpiles). As those stockpiles approach an unmanageable capacity as determined by Duke, Duke may, after
notifying Lafarge, load trucks with complying gypsum that will be designated as refused gypsum. 

  

	 	•	 	Trucks loaded with refused gypsum will be weighed at the on-site certified scales. These weigh tickets will be the official documents of refused tonnage and be available for inspection. A log of such tickets and the
respective tonnage will be shared between the parties in an agreed format. 

  

	 	•	 	Once gypsum has been designated as refused gypsum, Duke will ensure that it is never included in delivery or cost to Lafarge, but once designated as refused Duke has the right to dispose, store or sell the gypsum
without any further obligations to Lafarge. 

  

	 	•	 	Duke may choose to establish additional temporary stockpiles for refused gypsum at its power stations (Duke stockpiles). Such stockpiles will be clearly separate from the Lafarge stockpiles, and the Lafarge stockpiles
will be available for inspection. Duke will ensure that gypsum from the Duke stockpiles are never included in delivery or cost to Lafarge. 

If you are in agreement with this letter, please so indicate by signing below and returning a copy to my address. 

 

							
	Agreed:	 		 		 	
				
	/s/ John Dickman	 		 		 	/s/ Tony R. Mathis
				
	John Dickman	 		 		 	Tony R. Mathis
	Director of Purchasing - Gypsum	 		 		 	Director of Byproducts, Fuels & Materials Handling
	Lafarge North America Inc	 		 		 	Duke Energy OhioEX-10.24

 Exhibit 10.24 

Certain confidential information has been omitted from this Exhibit 10.24 pursuant to a request for confidential treatment filed separately with the
Securities and Exchange Commission. The omitted information is indicated by the symbol “* * *” at each place in this Exhibit 10.24 where the omitted information appeared in the original. 

Amendment No. 1 to Supply Agreement 

This Amendment No. 1 (this “Amendment”) to the Supply Agreement dated as of December 11, 2007 (the “Supply
Agreement”) between Synthetic Materials, LLC, a Florida limited liability company (“SynMat”) and Lafarge North America Inc., a Maryland company (“Lafarge”) is dated as of this 22nd day of December, 2008. 

WHEREAS, SynMat and Lafarge are parties to the Supply Agreement and wish to amend the Supply Agreement in order to
modify the volume and price terms thereof, as further specified in this Amendment; 
 WHEREAS, capitalized terms are
used in this Amendment as defined in the Supply Agreement; 
 NOW THEREFORE, the parties agree as follows: 

 

	 	1.	Amendment to Section 1A. The first sentence of Section 1A is deleted, and the following sentence is inserted in its place: 

“For each of calendar year * * * and * * *, SynMat will sell and deliver to Lafarge, and Lafarge will purchase from
SynMat, Gypsum from SynMat’s Facilities in the amount of a minimum of * * * and a maximum of * * * Gypsum, for * * * a minimum of * * * and a maximum of * * *, for * * * a minimum of
* * * and a maximum of the total production of Trimble County which is expected to be * * * Gypsum, and for each of the calendar years * * *, SynMat will sell and deliver to Lafarge, and Lafarge will purchase from
SynMat, Gypsum from SynMat’s Facilities in the amount or a minimum * * * to a maximum of the total production of Trimble County which is expected to be * * * Gypsum, which complies with the requirements set forth in Exhibit
A.” 
  

	 	2.	Amendment to Section 6A. The first two sentences of Section 6A are deleted, and the following sentences are inserted in their place: 

“For * * * and * * * the price shall be * * * FOB truck at SynMat’s Facilities. Beginning
* * *, Lafarge shall pay SynMat a Base Price of * * *, subject to an annual adjustment on January 1 of each year starting * * *, for Gypsum loaded into Lafarge supplied barges from SynMat’s Facilities at the
Trimble County Power Station during the Term of this Agreement.” 
  

	 	3.	No other Amendments. Except as expressly modified by this Amendment, the Supply Agreement is confirmed and ratified in all other respects. 

 

	 	4.	Counterparts. This Amendment may be signed by any number of counterparts, each of which shall be deemed an original and the signatures delivered by telecopy, each of which shall be an original, with the same
effect as if the signatures thereto and hereto were upon the same instrument and delivered in person. Signatures delivered by facsimile shall be binding for all purposes hereof. 

 IN WITNESS WHEREOF, SynMat and Lafarge have caused this Amendment No. I to Supply Agreement to be
duly executed by their duly authorized officers as of the date specified above. 
  

			
	SYNTHETIC MATERIALS, LLC
		
	By:	 	 /s/ Sean P. Colgan

		
	Name:	 	 Sean P. Colgan

		
	Title:	 	 Chairman

	
	LAFARGE NORTH AMERICA INC.
		
	By:	 	 /s/ Ike Preston

		
	Name:	 	 Ike Preston

		
	Title:	 	 President LNA GypsumEX-10.25

 Exhibit 10.25 

Certain confidential information has been omitted from this Exhibit 10.25 pursuant to a request for confidential treatment filed separately with the
Securities and Exchange Commission. The omitted information is indicated by the symbol “* * *” at each place in this Exhibit 10.25 where the omitted information appeared in the original. 

AMENDMENT ONE 
 TO

 GYPSUM CONTRACT 

This Amendment One to Gypsum Contract (this “Amendment”) is made and entered into to be effective December 11, 2008, by
and between Seminole Electric Cooperative, Inc., an electric generation and transmission cooperative corporation organized under the laws of the State of Florida (together with its successors and assigns, “Seminole”) which is the operator
of the Seminole electric generating plant located at 890 North Highway 17, Palatka, Florida 32178 (the “Seminole Plant”) and Lafarge North America Inc., previously known as Lafarge Corporation, a Maryland corporation (together with its
successors and assigns, “Lafarge”). In this Amendment, Seminole and Lafarge are sometimes collectively referred to as “Parties” and individually as a “Party”. 

RECITALS: 

WHEREAS, Lafarge changed its name from “Lafarge Corporation” to “Lafarge North America Inc.”, effective September 1,
2001, and has filed Articles of Amendment with the state of Maryland to reflect said name change; and 
 WHEREAS, Seminole and Lafarge
entered into that certain Gypsum Contract, dated as of August 9, 1999, and all capitalized terms used herein are as defined in the Gypsum Contract, unless otherwise stated; and 

WHEREAS, Seminole plans to redesign and modify the effluent processing facility (“Effluent Facility”) at the Seminole Plant; and

 WHEREAS, because of the modifications to the Effluent Facility, the Parties desire to agree to certain changes and modifications to the
Gypsum Contract to be effective in the future. 

 NOW, THEREFORE, in consideration of the foregoing and other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, the Parties, intending to be legally bound, hereby agree as follows: 
 Seminole
is currently proceeding with the permitting and construction of the redesign and modifications to the Effluent Facility. It is anticipated that these changes will be completed on or before January 1, 2009, Seminole shall provide written notice
to Lafarge stating the date that the modified Effluent Facility will go into operation (“Facility Operation Date”). As of the Facility Operation Date, the following changes and modifications to the Gypsum Contract shall become effective:

  

	 	A.	Section 5. Complying Gypsum; Moisture Content; Invoice Adjustments. 

  

	 	(a)	Complying Gypsum, shall be clarified as follows: 

 The Parties acknowledge and agree that the
test method protocol set forth in Revised Exhibit A for * * * is based upon the use of a hand held meter to measure * * * and determine exposure limits within the worker environment. The Parties will jointly continue to work together to
refine such testing protocols and procedures for measurement of * * * and calculation of worker exposure limits. In the event that after Material has been delivered (“Delivered Material”), it is determined by Lafarge to exceed
the * * *, the Parties agree to react as soon as reasonably practicable, and Seminole will perform such additional, testing on the Delivered Material, as well as pre-delivered Material, as may be appropriate. If such additional testing
determines that the Delivered Material exceeds the * * *, the Parties will negotiate in good faith to reach an equitable agreement as to the disposition of any such Delivered Material. If no such agreement can be reached, Lafarge’s
sole remedy shall be to reject such Delivered Material as Non-Complying Gypsum and receive a credit for any amount paid to Seminole for such Delivered Material. If such additional testing on the pre-delivered Material determines that the Material
exceeds the * * *, Seminole will suspend further delivery of Material until the testing protocol demonstrates compliance with the * * *. 

The second paragraph of (b) Moisture Adjustment shall be deleted and replaced with the following: 

If the annual weighted average moisture content of Complying Gypsum sold and delivered to Lafarge in any Contract Year during the Initial Term
or any Renewal Term(s), as the case may be, is less than * * * but is not less than * * *, rounded to the nearest one-tenth of a percentage point, the applicable price per Ton, as provided in and adjusted pursuant to
Section 9 hereof, shall be increased by an amount (“Premium Amount”), to be charged as set forth in subsection (c) hereof, as follows: 
  

			
	 Moisture Content
	  	 Premium Amount

		
	* * *	  	* * *
	* * *	  	* * *
	* * *	  	* * *
	* * *	  	* * *
	* * *	  	* * *

  
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	 	B.	Section 7. Delivery and Related Matters. 

 Section (a) Delivery of Complying
Gypsum shall be deleted and replaced with the following: 
 (a) Delivery of Complying Gypsum. Seminole shall deliver Complying Gypsum
to Lafarge by causing it to be loaded onto the Lafarge Conveyor, to be constructed and maintained for that purpose by Lafarge at its sole cost (“Point of Delivery”). The Point of Delivery on the Lafarge Conveyor shall change from the point
that has been utilized since the Commencement Date to the point on the Lafarge Conveyor at the inlet to the transfer hopper at the turn between the existing conveyor belts 4 and 5. As of the Facility Operation Date, the Amendment One to Conveyor
Easement and Limited Access Easement, in the form attached hereto as Exhibit B shall be executed by the Parties and recorded in the Public Records of Putnam County, Florida. The Conveyor Easement and Limited Access Easement, as amended, is for the
purpose of allowing Lafarge to continue to construct, operate, maintain and repair the Lafarge Conveyor, with all such construction, operation, maintenance and repair work to be performed at Lafarge’s sole expense. The Lafarge Conveyor shall at
all times be owned by Lafarge. In the event that the Lafarge Conveyor becomes inoperable, Seminole shall during the period of such inoperability deliver Complying Gypsum to a site (to be agreed upon by the Parties at the time) near the Seminole
Plant’s new effluent processing facility designed to serve Seminole Units 1, 2 and 3, which site will during such period of inoperability be deemed the alternative Point of Delivery. It shall be the responsibility of Lafarge, at its sole
expense, to remove or relocate the Complying Gypsum from such alternative Point of Delivery within two (2) calendar days (or, if storage space at the alternative Point of Delivery is then available in Seminole’s reasonable discretion, such
longer period as Seminole shall agree to in writing, such agreement not to be unreasonably withheld, delayed or conditioned) from the date of delivery thereto_ In the event Lafarge fails to remove or relocate the Complying Gypsum delivered to such
alternative Point of Delivery within such two day period (or such longer period as Seminole may agree to as provided above), then Seminole shall have the right to relocate such Complying Gypsum to a location to be agreed on by the Parties at the
time. Lafarge shall pay all such reasonable costs as are incurred by Seminole in connection with such relocation within thirty (30) days after receipt of Seminole’s invoice therefor. 

Section (b) Weighing of Complying Gypsum shall be deleted and replaced with the following: 

(b) Weighing of Complying Gypsum. Seminole shall utilize a certified and calibrated belt scale to weigh all Complying Gypsum immediately
prior to the loading of such Complying Gypsum onto the Lafarge Conveyor or the delivery of Complying Gypsum to the alternative Point of Delivery described in subsection (a) hereof, as the case may be, Seminole shall, at its sole expense,
operate and maintain such belt scale in commercially good working order and repair. At least once every six months, Seminole shall at its own expense cause such belt scale to be certified by an independent third party and at least once per month
Seminole shall at its own expense calibrate such belt scale. Lafarge shall have the right to observe the weighing of Complying Gypsum and any certification and calibration of the belt scale and, in connection with such right, Seminole shall provide
at least 

  
 3 

 
48 hours’ advance notice to Lafarge of the time and date of each certification and calibration of the belt scale. In the event that any certification or calibration shows any scale used to
weigh Complying Gypsum to be inaccurate by more than plus or minus one-half of one percent, the inaccuracy shall be deemed to have existed for one-half the number of days since the date of the most recent certification or calibration, as the case
may be, and an adjustment shall be made on the next monthly invoice in order to reflect an appropriate debit or credit. Seminole shall provide a copy of the results of each certification or calibration, as applicable, of the belt scale to Lafarge
with the next monthly invoice which is sent to Lafarge. During any period when Seminole’s belt scale is inoperable, the Parties shall mutually agree on a procedure for determining quantities of Complying Gypsum in order to permit deliveries of
Complying Gypsum to continue during such period of inoperability. 
  

	 	C.	Exhibit A. 

 Exhibit A to the Gypsum Contract shall be deleted and replaced with
the Revised Exhibit A attached hereto and all references in the Gypsum Contract to “Exhibit A” shall be deemed to refer to “Revised Exhibit A”. 

The terms, conditions and provisions of the Gypsum Contract shall remain in full force and effect except as modified or amended by this
Amendment. 
 IN WITNESS WHEREOF, the Parties have caused this Amendment to be signed by their respective duly authorized officers effective
as of the day and year first written above. 
  

			
	Seminole Electric Cooperative, Inc.
		
	By:	 	 /s/ Tim Woodbury

		
	Title:	 	 General Manager

	
	Lafarge North America Inc.
		
	By:	 	 /s/ Ike Preston

		
	Title:	 	 President LNA Gypsum

  
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