Document:

EX-10.18.8

 Exhibit 10.18.8 

RATIFICATION OF UNLIMITED GUARANTIES 

This Ratification of Unlimited Guaranties is signed effective July 15, 2018, by the undersigned guarantors (collectively
“Guarantors”) in connection with the renewal of the Revolving Loan made by PLAINSCAPITAL BANK (“Lender”) to MAALT, L.P., a Texas limited partnership. The Revolving Loan
is defined in and governed by the Loan Agreement dated June 15, 2014, among MAALT, L.P., a Texas limited partnership, and GHMR OPERATIONS, L.L.C., a Texas limited liability company (collectively “Borrowers”) and
Lender, as now or hereafter amended, restated, replaced, supplemented, or otherwise modified, from time to time (collectively the “Loan Agreement”). Capitalized terms not otherwise defined have the meanings assigned in the Loan
Agreement. 
  

	1.	 Ratification. 

Each of the Guarantors is legally obligated under an unlimited guaranty dated June 15, 2014, or dated February 11, 2015, executed by
each of the respective Guarantors in favor of Lender in connection with the Loans to Borrowers (collectively the “Guaranties”). 

By signing below, each of the Guarantors ratifies and confirms their respective Guaranty, acknowledges that their Guaranty is valid,
subsisting, and binding upon the respective Guarantors, and agrees that their Guaranty guarantees payment of the Loans (including the Term Loan, Revolving Loan, Second Term Loan, Third Term Loan, and Fourth Term Loan), and the Notes (including the
Term Note, Revolving Note, Second Term Note, Third Term Note, and Fourth Term Note). 
  

	2.	 Notice of Final Agreement. 

As of the effective date of this Notice, Borrowers, Guarantors, and Lender have consummated a transaction pursuant to which Lender has agreed
to make a loan or loans to Borrowers, to renew and extend an existing loan or loans to Borrowers, and to otherwise extend credit or make financial accommodations to or for the benefit of Borrowers, in an amount up to $2,000,000.00 (collectively,
whether one or more, the “Loans”). 
 In connection with the Loans, Borrowers and Lender and the undersigned Guarantors
have executed and delivered and may hereafter execute and deliver certain agreements, instruments, and documents (collectively hereinafter referred to as the “Written Loan Agreement”). 

It is the intention of Borrowers, Lender, and Guarantors that this Notice be incorporated by reference into each of the written agreements,
instruments, and documents comprising the Written Loan Agreement. Borrowers, Lender, and Guarantors each warrant and represent that the entire agreement made and existing by or among Borrowers, Lender, and Guarantors with respect to the Loan is and
shall be contained within the Written Loan Agreement, as amended and supplemented hereby, and that no agreements or promises exist or shall exist by or among Borrowers, Lender, and Guarantors that are not reflected in the Written Loan Agreement.

 THE WRITTEN LOAN AGREEMENT REPRESENTS THE FINAL AGREEMENT BETWEEN THE PARTIES AND MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS, OR
SUBSEQUENT ORAL AGREEMENTS OF THE PARTIES. 

 THERE ARE NO UNWRITTEN AGREEMENTS BETWEEN THE PARTIES. 

Effective Date: July 15, 2018. 
 ACKNOWLEDGED AND AGREED:

 GUARANTORS: 
  

			
	 DENETZ LOGISTICS, L.L.C.,

a Texas limited liability company

	By:	 	 VPROP Operating, LLC,
 its sole
member

	By:	 	 Vista Proppants and Logistics, LLC,
 its sole
member

  

					
		 	By:	 	/s/ Gary Humphreys
		 		 	 Gary Humphreys,

Chief Executive Officer & Manager

  

	
	/s/ Gary Blaine Humphreys
	 Gary Blaine Humphreys, as co-trustee of the ERIC
BLAINE HUMPHREYS TRUST created under Trust Agreement dated December 14, 2012

  

	
	/s/ Claudia Ann Humphreys
	 Claudia Ann Humphreys, as co-trustee of the ERIC
BLAINE HUMPHREYS TRUST created under Trust Agreement dated December 14, 2012

  

					
	[July 11, 2018]	 	Ratification and Notice of Final Agreement - Page 2

	
	/s/ Gary Blaine Humphreys
	 Gary Blaine Humphreys, as co-trustee of the JAKE
ALLEN HUMPHREYS TRUST created under Trust Agreement dated December 14, 2012

  

	
	/s/ Claudia Ann Humphreys
	 Claudia Ann Humphreys, as co-trustee of the JAKE
ALLEN HUMPHREYS TRUST created under Trust Agreement dated December 14, 2012

  

			
	 FUTURE NEW DEAL, LTD.,

a Texas limited partnership

	By:	 	 Future New Deal II, LLC,
 Its general
partner

  

					
		 	By:	 	/s/ Gary Humphreys
		 		 	 Gary Humphreys, Manager

  

	
	/s/ Martin W. Robertson
	 Martin W. Robertson, as co-trustee of the CHRISTOPHER
MARTIN ROBERTSON TRUST created under Trust Agreement dated December 18, 2012

  

	
	/s/ Janet Lynn Robertson
	 Janet Lynn Robertson, as co-trustee of the CHRISTOPHER
MARTIN ROBERTSON TRUST created under Trust Agreement dated December 18, 2012

  

	
	/s/ Martin W. Robertson
	 Martin W. Robertson, as co-trustee of the CLAIRE
ANN ROBERTSON TRUST created under Trust Agreement dated December 18, 2012

  

					
	[July 11, 2018]	 	Ratification and Notice of Final Agreement - Page 3

	
	/s/ Janet Lynn Robertson
	 Janet Lynn Robertson, as co-trustee of the CLAIRE
ANN ROBERTSON TRUST created under Trust Agreement dated December 18, 2012

  

			
	 M & J PARTNERSHIP, LTD.,

a Texas limited partnership

	By:	 	 T.Y.F. Holdings, LLC,
 Its general
partner

  

					
		 	By:	 	/s/ Martin W. Robertson
		 		 	     Martin W. Robertson, Manager

  

					
	[July 11, 2018]	 	Ratification and Notice of Final Agreement - Page 4EX-10.18.11

 Exhibit 10.18.11 

 
 

 
 PlainsCapital Bank 

AMENDED AND RESTATED 

REVOLVING PROMISSORY NOTE 
  

					
	$2,000,000.00	 	Fort Worth, Texas	 	July 15, 2018

 Promise to Pay. For value received, MAALT, L.P. (“Borrower”), a Texas limited
partnership, promises to pay to the order of PLAINSCAPITAL BANK (“Lender”), at its offices in Tarrant County, Texas, at 801 Houston Street, Fort Worth, Texas 76102, the sum of Two Million
Dollars ($2,000,000.00) (“Total Principal Amount”), or such amount less than the Total Principal Amount which is outstanding from time to time, in legal and lawful money of the United States of America, together with interest
thereon from this date until maturity at a fluctuating rate per annum equal to the lesser of (a) the Prime Rate in effect from day to day (the “Contract Rate”); provided, however, that the Contract Rate shall never fall below a
floor rate of five percent (5.0%) per annum; or (b) the Maximum Rate. “Prime Rate” shall mean at any time the rate of interest per annum then most recently established by The Wall Street Journal as the “prime
rate” on corporate loans for large U.S. commercial banks, as published in the Money Rates section of The Wall Street Journal, computed on the basis of a year of 360 days and for the actual number of days elapsed (including the first day
but excluding the last day); and “Maximum Rate” shall mean at the particular time in question the maximum rate of interest which, under applicable law, may then be charged on this Revolving Note. Each change in the interest rate
shall become effective without notice to Borrower on the effective date of each change in the Maximum Rate or the Prime Rate, as the case may be. If at any time the Contract Rate, together with all charges made in connection with the loan evidenced
by this Revolving Note that may be treated as interest under applicable law, shall exceed the Maximum Rate, thereby causing the interest on the principal of this Revolving Note to be limited to the Maximum Rate, then notwithstanding any subsequent
change in either the Prime Rate or the Maximum Rate that would otherwise reduce the Contract Rate to less than the Maximum Rate, the rate of interest on the principal of this Revolving Note shall remain equal to the Maximum Rate until the total
amount of interest accrued on the principal of this Revolving Note equals the amount of interest which would have accrued on the principal of this Revolving Note if the Contract Rate had at all times been in effect. 

Payment Terms. This Revolving Note is due and payable on the terms set out below: 

(a)    interest shall be due and payable monthly as it accrues, commencing on the fifteenth (15th) day of August, 2018, and continuing on the fifteenth (15th) day of each successive month thereafter during the term of this Revolving Note; and

 (b)    the principal of this Revolving Note shall be due and payable as required by the Loan Agreement (as defined
below) to meet any Borrowing Base deficiency (if and when required by Lender under the Loan Agreement); and 

  

			
	[July 18, 2018]	 	

 (c)    the outstanding principal balance of this Revolving Note,
together with all accrued but unpaid interest, shall be due and payable on the Maturity Date. Unless its maturity is sooner accelerated as set forth herein, this Revolving Note will mature on July 15, 2019 (the “Maturity
Date”), at which time all unpaid sums then owing will be payable in full, principal and interest. 
 This Revolving Note may be prepaid in whole or
in part at any time without premium or penalty. 
 Security. Payment hereof is secured by the following (collectively the
“Loan Documents”): (1) obligations under a Loan Agreement dated June 15, 2014, executed by Borrower, GHMR Operations, L.L.C., Lender, and others, as now or hereafter amended, restated, replaced, supplemented, or otherwise
modified, from time to time (the “Loan Agreement”); (2) the Security Documents (as defined in the Loan Agreement); and (3) any other agreement (now existing or made hereafter) relating to the loans between Lender and Borrower.

 Revolving Credit. Under the Loan Agreement, Borrower may request advances and make payments hereunder from time to time, provided
that it is understood and agreed that the aggregate principal amount outstanding from time to time hereunder shall not at any time exceed the Total Principal Amount or the Borrowing Base as set forth in the Loan Agreement. The unpaid balance of this
Revolving Note shall increase and decrease with each new advance or payment hereunder, as the case may be. This Revolving Note shall not be deemed terminated or canceled prior to the Maturity Date, although the entire principal balance hereof may
from time to time be paid in full. Borrower may borrow, repay, and reborrow hereunder. Unless otherwise agreed to in writing or otherwise required by applicable law, payments will be applied first to unpaid accrued interest, then to principal, and
any remaining amount to any unpaid collection costs, delinquency charges, and other charges; provided, however, upon delinquency or other Event of Default, Lender reserves the right to apply payments among principal, interest, delinquency charges,
collection costs, and other charges, in such order and manner as the holder of this Revolving Note may from time to time determine in its sole discretion. All payments and prepayments of principal of or interest on this Revolving Note shall be made
in lawful money of the United States of America in immediately available funds, at the address of Lender indicated above, or such other place as the holder of this Revolving Note shall designate in writing to Borrower. If any payment of principal of
or interest on this Revolving Note shall become due on a day which is not a Business Day (as defined below), such payment shall be made on the next succeeding Business Day and any such extension of time shall be included in computing interest in
connection with such payment. As used herein, the term “Business Day” shall mean any day other than a Saturday, Sunday, or any other day on which national banking associations are authorized to be closed. The books and records of
Lender shall be prima facie evidence of all outstanding principal of and accrued and unpaid interest on this Revolving Note. 

Interest on Past Due Amounts and Default Interest. To the extent any interest is not paid on or before the date it becomes due and
payable, Lender may, at its option, add such accrued but unpaid interest to the principal of this Revolving Note. Notwithstanding anything herein to the contrary, (i) while any Event of Default (as defined below) is outstanding, (ii) upon
notice from Lender of a Borrowing Base deficiency under the Loan Agreement and thereafter so long as the Borrowing Base deficiency exists, (iii) upon acceleration of the maturity hereof following an uncured Event of Default, or (iv) at the
Maturity Date, all principal of this Revolving Note shall, at the option of Lender, bear interest at the Maximum Rate until paid. 

  

			
	[July 18, 2018]	 	Amended and Restated Revolving Promissory Note - Page 2 of 5

 Late Fees. To the extent any payment due under this Revolving Note or any Loan
Document is not paid within ten (10) calendar days of the due date therefore, in addition to any interest or other fees and charges due hereunder or under the applicable Loan Document, Borrowers shall pay a late fee equal to five percent (5%)
of the amount of the payment that was required to have been made. 
 Events of Default. The occurrence at any time of any of the
following events or the existence of any of the following conditions shall collectively be called “Events of Default” or singly called an “Event of Default”: 

(a)    Failure to make punctual payment when due of any sums owing on this Revolving Note; or 

(b)    Any “Event of Default” under the Loan Agreement, the Events of Default defined in the Loan Agreement being
cumulative to those contained in this Revolving Note. 
 Remedies. Upon an Event of Default, and Borrower’s failure to timely
cure such default following any notice, cure, or grace period required by the Loan Agreement, at the option of Lender the entire indebtedness evidenced hereby, as well as all other liabilities of Borrower to Lender, shall be matured without further
notice, and Lender may exercise any or all of the rights and remedies available to it, including, without limitation, those under this Revolving Note, the Loan Documents, and any other instrument or agreement relating hereto, or any one or more of
them. The failure of Lender to exercise its option to accelerate the maturity of this Revolving Note shall not constitute a waiver of its right to exercise the same at any other time. Any Event of Default under this Revolving Note shall constitute a
default under each of the Loan Documents, and any default under any of the Loan Documents shall constitute an Event of Default under this Revolving Note. 

Waiver. Except such notice of default as is specifically required by the Loan Agreement, Borrower and all other Obligated Parties
severally waive the order of their liability, the marshaling of assets, demand, presentment for payment, notice of dishonor, protest and notice of protest, notice of default, notice of intent to accelerate maturity, and notice of the acceleration.
Borrower and all other Obligated Parties agree to all renewals and extensions of this Revolving Note and partial payments and releases or substitutions of security, in whole or in part, with or without notice, before or after maturity. In case of
any renewal or extension of this Revolving Note or any part of the indebtedness evidenced hereby, all liens and security interests securing payment hereof will continue to secure payment of the renewal or extension note or notes. 

Business Loan. Borrower represents to and covenants with Lender that: (1) all loans evidenced by this Revolving Note are and shall
be “business loans” as that term is used in the Depository Institutions Deregulation and Monetary Control Act of 1980, as amended; and (2) the loans are for business, commercial, investment, or other similar purposes and not for
personal, family, household, or agricultural use, as those terms are used in the Texas Finance Code. Borrower and Lender further agree that Chapter 346 of the Texas Finance Code does not apply to this Revolving Note, even if this Revolving Note
evidences a revolving debt. 

  

			
	[July 18, 2018]	 	Amended and Restated Revolving Promissory Note - Page 3 of 5

 Collection Costs. If this Revolving Note is placed in the hands of attorneys for
collection, if suit is filed hereon, if this Revolving Note is collected through bankruptcy proceedings (including any proceeding, federal or state, for the relief of debtors), or if Lender becomes a party either as plaintiff or defendant in any
legal proceeding in relation to the property securing payment of this Revolving Note, Borrower agrees to pay additionally to Lender reasonable attorneys fees and collection costs. 

Savings Clause. Regardless of any provision contained in this Revolving Note, the Loan Documents, or any instrument executed or
delivered in connection herewith, it is the express intent of the parties that at no time shall any of the Obligated Parties pay interest in excess of the Maximum Rate (or any other interest amount which might in any way be deemed usurious), and
Lender will never be considered to have contracted for or to be entitled to charge, receive, collect, or apply as interest on this Revolving Note, any amount in excess of the Maximum Rate (or any other interest amount which might in any way be
deemed usurious), and, in the event that Lender ever receives, collects, or applies as interest any such excess, the amount which would be excessive interest will be applied to the reduction of the principal balance of this Revolving Note, and, if
the principal balance of this Revolving Note is paid in full, any remaining excess shall forthwith be paid to Borrower. In determining whether the interest paid or payable exceeds the Maximum Rate (or any other interest amount which might in any way
be deemed usurious), Borrower and Lender shall, to the maximum extent permitted under applicable law: (1) characterize any non-principal payment (other than payments which are expressly designated as
interest payments hereunder) as an expense or fee rather than as interest; (2) exclude voluntary prepayments and the effect thereof; and (3) spread the total amount of interest throughout the entire contemplated term of this Revolving Note
so that the interest rate is uniform throughout the term. 
 Miscellaneous. EXCEPT TO THE EXTENT THAT THE LAWS OF THE UNITED STATES
MAY APPLY, THIS REVOLVING NOTE SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF TEXAS. THIS INSTRUMENT IS MADE AND IS PERFORMABLE IN FORT WORTH, TARRANT COUNTY, TEXAS, AND IN THE EVENT OF A DISPUTE INVOLVING THIS
REVOLVING NOTE OR ANY OTHER INSTRUMENT EXECUTED IN CONNECTION HEREWITH, BORROWER IRREVOCABLY AGREES THAT VENUE FOR SUCH DISPUTES SHALL BE IN ANY COURT OF COMPETENT JURISDICTION IN TARRANT COUNTY, TEXAS. 

Time is of the essence of this Revolving Note. 

This Revolving Note may not be changed orally, but only by an agreement in writing signed by the party against whom enforcement of any waiver,
change, modification, or discharge is sought. 
 This Revolving Note and all the covenants, promises, and agreements contained herein are
binding upon and inure to the benefit of Borrower and Lender and their respective heirs, personal representatives, successors, and assigns. 

  

			
	[July 18, 2018]	 	Amended and Restated Revolving Promissory Note - Page 4 of 5

 Section headings or captions are for convenience only and are not to be used in interpreting
the provisions of this Revolving Note. 
 Renewal. This Revolving Note renews and extends the revolving promissory note dated
June 15, 2017, in the principal amount of $2,000,000.00, executed by Borrower, and payable to the order of Lender. 
 Notice of
Final Agreement. THE WRITTEN LOAN AGREEMENT REPRESENTS THE FINAL AGREEMENT BETWEEN THE PARTIES AND MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS, OR SUBSEQUENT ORAL AGREEMENTS OF THE PARTIES. THERE ARE NO UNWRITTEN AGREEMENTS
BETWEEN THE PARTIES. 
 Executed and delivered to Lender in Fort Worth, Texas, on the date stated above. 

 

			
	 MAALT, L.P.,
 a Texas limited
partnership

	By:	 	 Denetz Logistics, L.L.C.,
 its general
partner

	By:	 	 VPROP Operating, LLC,
 its sole
member

	By:	 	 Vista Proppants and Logistics, LLC,
 its sole
member

  

					
		 	By:	 	/s/ Gary Humphreys
		 		 	 Gary Humphreys

Chief Executive Officer & Manager

 This Revolving Note was prepared by: 

HARRIS, FINLEY & BOGLE, P.C. 
 777 Main Street, Suite
1800 
 Fort Worth, Texas 76102-5341 
 [telephone number] 

  

			
	[July 18, 2018]	 	Amended and Restated Revolving Promissory Note - Page 5 of 5

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