Common use of Signature Pages to Follow Clause in Contracts

Signature Pages to Follow. This Amendment is executed as of the Effective Date. BORROWER: TEXAS OIL & CHEMICAL CO. II, INC. By: /s/ Xxxx Xxxxx Name: Xxxx Xxxxx Title: Treasurer GUARANTORS: SOUTH HAMPTON RESOURCES, INC. By: /s/ Xxxx Xxxxx Name: Xxxx Xxxxx Title: Treasurer GULF STATE PIPE LINE COMPANY, INC. By: /s/ Xxxx Xxxxx Name: Xxxx Xxxxx Title: Treasurer TRECORA CHEMICAL, INC. By: /s/ Xxxx Xxxxx Name: Xxxx Xxxxx Title: Treasurer (Texas Oil & Chemical Co. II, Inc.) ADMINISTRATIVE AGENT: BANK OF AMERICA, N.A., as Administrative Agent By: /s/ Xxxxxxx X. Xxxx Name: Xxxxxxx X. Xxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: BANK OF AMERICA, N.A., as a Lender, L/C Issuer and Swingline Lender By: /s/ Xxxx Xxxx Xxxx Xxxx Senior Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: CITIBANK, N.A., as a Lender and L/C Issuer By: /s/ Xxxxxxx Xxxxxx Name: Xxxxxxx Xxxxxx Title: Senior Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: BMO XXXXXX BANK N.A., as a Lender By:/s/ Xxxxx Xxxxxx Name: Xxxxx Xxxxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: CAPITAL ONE, N.A., as a Lender By:/s/ Xxxxx X. Xxxxxx Name: Xxxxx X. Xxxxxx Title: Senior Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: REGIONS BANK, as a Lender By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) DEPARTING LENDER: COMPASS BANK, as a Departing Lender By: /s/ Xxxxxxx Xxxxxx Name: Xxxxxxx Xxxxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) DEPARTING LENDER: SUNTRUST BANK, as a Departing Lender By: /s/ Xxxxxx Xxxx Name: Xxxxxx Xxxx Title: Director (Texas Oil & Chemical Co. II, Inc.) ANNEX A Amended and Restated Credit Agreement ANNEX A Published CUSIP Number: 00000XXX0 AMENDED AND RESTATED CREDIT AGREEMENT Dated as of October 1, 2014 as amended by the First Amendment, dated as of February 20, 2015, by the Second Amendment, dated as of March 28, 2017, and by the Third Amendment, dated as of Jul 25, 2017; and as further amended as of July 31, 2018 among TEXAS OIL & CHEMICAL CO. II, INC., as Borrower, CERTAIN SUBSIDIARIES OF THE BORROWER PARTY HERETO, as Guarantors, BANK OF AMERICA, N.A., as Administrative Agent, Swingline Lender and an L/C Issuer, and CITIBANK, N.A., as an L/C Issuer, and THE LENDERS PARTY HERETO XXXXXXX LYNCH, PIERCE, XXXXXX & XXXXX INCORPORATED, and CITIBANK, N.A. as SoleJoint Lead ArrangerArrangers and Sole BookrunnerJoint Bookrunners BMO XXXXXX BANK N.A., as Syndication Agent 4326171v8 TABLE OF CONTENTS Page ARTICLE I DEFINITIONS AND ACCOUNTING TERMS 16 1.01 Defined Terms 16 1.02 Other Interpretive Provisions 3539

Signature Pages to Follow. This Amendment is executed as of the Effective Date. BORROWER: TEXAS OIL & CHEMICAL CO. IIVAIL HOLDINGS, INC. ., as the Company By: /s/ Xxxx Xxxxx Xxxxxxx X. Xxxxxx Name: Xxxx Xxxxx Xxxxxxx X. Xxxxxx Title: Treasurer GUARANTORS: SOUTH HAMPTON RESOURCES, INC. By: /s/ Xxxx Xxxxx Name: Xxxx Xxxxx Title: Treasurer GULF STATE PIPE LINE COMPANY, INC. By: /s/ Xxxx Xxxxx Name: Xxxx Xxxxx Title: Treasurer TRECORA CHEMICAL, INC. By: /s/ Xxxx Xxxxx Name: Xxxx Xxxxx Title: Treasurer (Texas Oil & Chemical Co. II, Inc.) ADMINISTRATIVE AGENT: Executive Vice President and Chief Financial Officer Fifth Amendment to Eight Amended and Restated Credit Agreement BANK OF AMERICA, N.A., as Administrative Agent By: /s/ Xxxxxxx X. Xxxx Xxxxx Xxxxx Name: Xxxxxxx X. Xxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: BANK OF AMERICA, N.A., as a Lender, L/C Issuer and Swingline Lender By: /s/ Xxxx Xxxx Xxxx Xxxx Senior Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: CITIBANK, N.A., as a Lender and L/C Issuer By: /s/ Xxxxxxx Xxxxxx Name: Xxxxxxx Xxxxxx Xxxxx Xxxxx Title: Senior Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: BMO XXXXXX BANK N.A., as a Lender By:/s/ Xxxxx Xxxxxx Name: Xxxxx Xxxxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: CAPITAL ONE, N.A., as a Lender By:/s/ Xxxxx X. Xxxxxx Name: Xxxxx X. Xxxxxx Title: Senior Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: REGIONS BANK, as a Lender By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) DEPARTING LENDER: COMPASS BANK, as a Departing Lender By: /s/ Xxxxxxx Xxxxxx Name: Xxxxxxx Xxxxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) DEPARTING LENDER: SUNTRUST BANK, as a Departing Lender By: /s/ Xxxxxx Xxxx Name: Xxxxxx Xxxx Title: Director (Texas Oil & Chemical Co. II, Inc.) ANNEX A Fifth Amendment to Eight Amended and Restated Credit Agreement ANNEX A Published CUSIP Number: 00000XXX0 AMENDED AND RESTATED CREDIT AGREEMENT Dated as of October 1, 2014 as amended by the First Amendment, dated as of February 20, 2015, by the Second Amendment, dated as of March 28, 2017, and by the Third Amendment, dated as of Jul 25, 2017; and as further amended as of July 31, 2018 among TEXAS OIL & CHEMICAL CO. II, INC., as Borrower, CERTAIN SUBSIDIARIES OF THE BORROWER PARTY HERETO, as Guarantors, BANK OF AMERICA, N.A., as Administrative Agent, Swingline Lender and an L/C Issuer, and CITIBANK, N.A., as an L/C Issuer, a Revolver Lender and a Term Loan Lender By: /s/ Xxxxx Xxxxx Name: Xxxxx Xxxxx Title: Senior Vice President Fifth Amendment to Eight Amended and Restated Credit Agreement U.S. BANK NATIONAL ASSOCIATION, as a Revolver Lender and a Term Loan Lender By: /s/ Xxxx Xxxxxxxxx Name: Xxxx Xxxxxxxxx Title: Vice President Fifth Amendment to Eight Amended and Restated Credit Agreement XXXXX FARGO BANK, NATIONAL ASSOCIATION, as an L/C Issuer, a Revolver Lender and a Term Loan Lender By: /s/ Xxxxx Xxxxxxxxx Name: Xxxxx Xxxxxxxxx Title: Senior Vice President Fifth Amendment to Eight Amended and Restated Credit Agreement TRUIST BANK (as successor by merger to SUNTRUST BANK), as a Revolver Lender and a Term Loan Lender By: /s/ Xxxxx Xxxxxx Name: Xxxxx Xxxxxx Title: Director Fifth Amendment to Eight Amended and Restated Credit Agreement BANK OF THE LENDERS PARTY HERETO XXXXXXX LYNCHWEST, PIERCEas a Revolver Lender and a Term Loan Lender By: /s/ Xxxxxxxxxxx Xxxxx Name: Xxxxxxxxxxx Xxxxx Title: Director Fifth Amendment to Eight Amended and Restated Credit Agreement BOKF, XXXXXX & XXXXX INCORPORATEDNA DBA BOK FINANCIAL, as a Revolver Lender and CITIBANK, N.A. as SoleJoint Lead ArrangerArrangers a Term Loan Lender By: /s/ Xxxxxxx X. Xxxxx Name: Xxxxxxx X. Xxxxx Title: Senior Vice President Fifth Amendment to Eight Amended and Sole BookrunnerJoint Bookrunners Restated Credit Agreement BMO XXXXXX BANK N.A., as Syndication Agent 4326171v8 TABLE OF CONTENTS Page ARTICLE I DEFINITIONS AND ACCOUNTING TERMS 16 1.01 Defined Terms 16 1.02 Other Interpretive Provisions 3539a Revolver Lender and a Term Loan Lender By: /s/ Xxxxx Xxxx Name: Xxxxx Xxxx Title: Director Fifth Amendment to Eight Amended and Restated Credit Agreement HSBC BANK USA, NATIONAL ASSOCIATION, as a Revolver Lender and a Term Loan Lender By: /s/ Xxx Xxxx Name: Xxx Xxxx Title: Senior Vice President Fifth Amendment to Eight Amended and Restated Credit Agreement PNC BANK, NATIONAL ASSOCIATION, as a Revolver Lender and a Term Loan Lender By: /s/ Xxxx Xxxxxxxx Name: Xxxx Xxxxxxxx Title: Senior Vice President Fifth Amendment to Eight Amended and Restated Credit Agreement HSBC BANK AUSTRALIA LIMITED, as a Term Loan Lender, For and on behalf of HSBC BANK AUSTRALIA LIMITED by its duly authorised attorney pursuant to a power of attorney in the presence of By: /s/ Xxxxxx Xxxxx Name: Xxxxxx Xxxxx Title: Attorney /s/ Xxxxxxx X’Xxxxxxx Name: Xxxxxxx X’Xxxxxxx Title: Witness Fifth Amendment to Eight Amended and Restated Credit Agreement

Signature Pages to Follow. This Amendment is executed as of the Effective Date. BORROWER: TEXAS OIL & CHEMICAL CO. IIVAIL HOLDINGS, INC. ., as the Company By: /s/ Xxxx Xxxxx Xxxxxxx X. Xxxxxx Name: Xxxx Xxxxx Xxxxxxx X. Xxxxxx Title: Treasurer GUARANTORS: SOUTH HAMPTON RESOURCES, INC. By: /s/ Xxxx Xxxxx Name: Xxxx Xxxxx Title: Treasurer GULF STATE PIPE LINE COMPANY, INC. By: /s/ Xxxx Xxxxx Name: Xxxx Xxxxx Title: Treasurer TRECORA CHEMICAL, INC. By: /s/ Xxxx Xxxxx Name: Xxxx Xxxxx Title: Treasurer (Texas Oil & Chemical Co. II, Inc.) ADMINISTRATIVE AGENT: Executive Vice President and Chief Financial Officer First Amendment to Eighth Amended and Restated Credit Agreement BANK OF AMERICA, N.A., as Administrative Agent By: /s/ Xxxxxxx X. Xxxx Name: Xxxxxxx X. Xxxx Title: Xxxxx Xxxxxxxx Xxxxx Xxxxxxxx Senior Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: First Amendment to Eighth Amended and Restated Credit Agreement BANK OF AMERICA, N.A., as a Lender, an L/C Issuer Issuer, a Swing Line Lender,a Revolver Lender and Swingline a Term Loan Lender By: /s/ Xxxx Xxxx Xxxx Xxxx Xxxxx Xxxxxxxx Xxxxx Xxxxxxxx Senior Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: CITIBANK, N.A.First Amendment to Eighth Amended and Restated Credit Agreement U.S. BANK NATIONAL ASSOCIATION, as a Swing Line Lender, a Revolver Lender and a Term Loan Lender By: /s/ Xxxxxx X. Xxxxxxxx Name: Xxxxxx X. Xxxxxxxx Title: Vice President First Amendment to Eighth Amended and Restated Credit Agreement XXXXX FARGO BANK, NATIONAL ASSOCIATION, as an L/C Issuer Issuer, a Revolver Lender and a Term Loan Lender By: /s/ Xxxxxxx Xxxxxx Name: Xxxxxxx Xxxxxx Title: Senior Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: BMO XXXXXX BANK N.A., as a Lender By:/s/ Xxxxx Xxxxxx Name: Xxxxx Xxxxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: CAPITAL ONE, N.A., as a Lender By:/s/ Xxxxx X. Xxxxxx Name: Xxxxx X. Xxxxxx Title: Senior Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: REGIONS BANK, as a Lender By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) DEPARTING LENDER: COMPASS BANK, as a Departing Lender By: /s/ Xxxxxxx Xxxxxx Name: Xxxxxxx Xxxxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) DEPARTING LENDER: VP First Amendment to Eighth Amended and Restated Credit Agreement SUNTRUST BANK, as a Departing Revolver Lender and a Term Loan Lender By: /s/ Xxxxxx Xxxx Name: Xxxxxx Xxxx Title: Director (Texas Oil & Chemical Co. II, Inc.) ANNEX A First Amendment to Eighth Amended and Restated Credit Agreement ANNEX A Published CUSIP Number: 00000XXX0 AMENDED AND RESTATED CREDIT AGREEMENT Dated as of October 1, 2014 as amended by the First Amendment, dated as of February 20, 2015, by the Second Amendment, dated as of March 28, 2017, and by the Third Amendment, dated as of Jul 25, 2017; and as further amended as of July 31, 2018 among TEXAS OIL & CHEMICAL CO. II, INC.BANK OF THE WEST, as Borrowera Revolver Lender and a Term Loan Lender By: /s/ Xxxxxxxx Xxx Name: Xxxxxxxx Xxx Title: Director, CERTAIN SUBSIDIARIES OF THE BORROWER PARTY HERETOCBG First Amendment to Eighth Amended and Restated Credit Agreement BOKF, NA DBA BOK FINANCIAL, as Guarantors, BANK OF AMERICA, N.A., as Administrative Agent, Swingline a Revolver Lender and an L/C Issuer, a Term Loan Lender By: /s/ Xxxxx Xxxxx Name: Xxxxx Xxxxx Title: Vice President First Amendment to Eighth Amended and CITIBANK, N.A., as an L/C Issuer, and THE LENDERS PARTY HERETO XXXXXXX LYNCH, PIERCE, XXXXXX & XXXXX INCORPORATED, and CITIBANK, N.A. as SoleJoint Lead ArrangerArrangers and Sole BookrunnerJoint Bookrunners Restated Credit Agreement BMO XXXXXX BANK N.A., as Syndication Agent 4326171v8 TABLE OF CONTENTS Page ARTICLE I DEFINITIONS AND ACCOUNTING TERMS 16 1.01 Defined Terms 16 1.02 Other Interpretive Provisions 3539a Revolver Lender and a Term Loan Lender By: /s/ Xxxxxxx Xxxxxxx Name: Xxxxxxx Xxxxxxx Title: Director First Amendment to Eighth Amended and Restated Credit Agreement HSBC BANK USA, NATIONAL ASSOCIATION, as a Revolver Lender and a Term Loan Lender By: /s/ Xxxx Xxxxx Name: Xxxx Xxxxx Title: Relationship Manager First Amendment to Eighth Amended and Restated Credit Agreement

Signature Pages to Follow. This Amendment is executed as of the Effective Date. BORROWER: TEXAS OIL & CHEMICAL CO. II, INC. By: /s/ S. Xxxx Xxxxx Name: S. Xxxx Xxxxx Title: Treasurer GUARANTORS: SOUTH HAMPTON RESOURCES, INC. By: /s/ S. Xxxx Xxxxx Name: S. Xxxx Xxxxx Title: Treasurer GULF STATE PIPE LINE COMPANY, INC. By: /s/ S. Xxxx Xxxxx Name: S. Xxxx Xxxxx Title: Treasurer TRECORA CHEMICAL, INC. By: /s/ S. Xxxx Xxxxx Name: S. Xxxx Xxxxx Title: Treasurer (Texas Oil & Chemical Co. II, Inc.) ADMINISTRATIVE AGENT: BANK OF AMERICA, N.A., as Administrative Agent By: /s/ Xxxxxxx X. Xxxx Name: Xxxxxxx X. Xxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: BANK OF AMERICA, N.A., as a Lender, L/C Issuer and Swingline Lender By: /s/ Xxxx Xxxx Xxxx Xxxx Senior Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: CITIBANK, N.A., as a Lender and L/C Issuer By: /s/ Xxxxxxx Xxxxxx Name: Xxxxxxx Xxxxxx Title: Senior Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: BMO XXXXXX BANK N.A., as a Lender By:/s/ Xxxxx Xxxxxx By: /s/ Ashley Bake Name: Xxxxx Xxxxxx Ashley Bake Title: Vice President Director (Texas Oil & Chemical Co. II, Inc.) LENDER: CAPITAL ONE, N.A., as a Lender By:/s/ By: /s/ Xxxxx X. Xxxxxx III Name: Xxxxx X. Xxxxxx III Title: Senior Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: REGIONS BANK, as a Lender By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Senior Vice President (Texas Oil & Chemical Co. II, Inc.) DEPARTING LENDER: COMPASS BANK, as a Departing Lender By: /s/ Xxxxxxx Xxxxxx Name: Xxxxxxx Xxxxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) DEPARTING LENDER: SUNTRUST BANK, as a Departing Lender By: /s/ Xxxxxx Xxxx Name: Xxxxxx Xxxx Title: Director (Texas Oil & Chemical Co. II, Inc.) ANNEX A Amended and Restated Credit Agreement ANNEX A Published CUSIP Number: 00000XXX0 AMENDED AND RESTATED CREDIT AGREEMENT Dated as of October 1, 2014 as amended by the First Amendment, dated as of February 20, 2015, by the Second Amendment, dated as of March 28, 2017, and by the Third Amendment, dated as of Jul 25, 2017; and as further amended as of July 31, 2018 among TEXAS OIL & CHEMICAL CO. II, INC., as Borrower, CERTAIN SUBSIDIARIES OF THE BORROWER PARTY HERETO, as Guarantors, BANK OF AMERICA, N.A., as Administrative Agent, Swingline Lender and an L/C Issuer, and CITIBANK, N.A., as an L/C Issuer, and THE LENDERS PARTY HERETO XXXXXXX LYNCH, PIERCE, XXXXXX & XXXXX INCORPORATED, and CITIBANK, N.A. as SoleJoint Lead ArrangerArrangers and Sole BookrunnerJoint Bookrunners BMO XXXXXX BANK N.A., as Syndication Agent 4326171v8 TABLE OF CONTENTS Page ARTICLE I DEFINITIONS AND ACCOUNTING TERMS 16 1.01 Defined Terms 16 1.02 Other Interpretive Provisions 3539President

Signature Pages to Follow. This Amendment is executed as of the Effective Date. BORROWER: TEXAS OIL & CHEMICAL CO. IITHE VAIL CORPORATION (D/B/A “VAIL ASSOCIATES, INC. .”), as the Company By: /s/ Xxxx Xxxxxxx X. Xxxxx Name: Xxxx Xxxxxxx X. Xxxxx Title: Treasurer GUARANTORS: SOUTH HAMPTON RESOURCES, INC. By: /s/ Xxxx Xxxxx Name: Xxxx Xxxxx Title: Treasurer GULF STATE PIPE LINE COMPANY, INC. By: /s/ Xxxx Xxxxx Name: Xxxx Xxxxx Title: Treasurer TRECORA CHEMICAL, INC. By: /s/ Xxxx Xxxxx Name: Xxxx Xxxxx Title: Treasurer (Texas Oil & Chemical Co. II, Inc.) ADMINISTRATIVE AGENT: Senior Executive Vice President and Chief Financial Officer BANK OF AMERICA, N.A., as Administrative Agent By: /s/ Xxxxxxx X. Xxxx Ronaldo Naval Name: Xxxxxxx X. Xxxx Ronaldo Naval Title: Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: BANK OF AMERICA, N.A., as a LenderLender By: /s/ Xxxxx XxXxxxxx Name: Xxxxx XxXxxxxx Title: Senior Vice President Fourth Amendment to Fourth Amended and Restated Credit Agreement LASALLE BANK NATIONAL ASSOCIATION, L/C Issuer and Swingline as a Lender By: /s/ Xxxxx XxXxxxxx Name: Xxxxx XxXxxxxx Title: Senior Vice President U.S. BANK NATIONAL ASSOCIATION, as a Lender By: /s/ Xxxx Xxxxxxxxx Name: Xxxx Xxxx Xxxx Senior Xxxxxxxxx Title: Vice President (Texas Oil & Chemical Co. IIFourth Amendment to Fourth Amended and Restated Credit Agreement XXXXX FARGO BANK, Inc.) LENDER: CITIBANK, N.A.NATIONAL ASSOCIATION, as a Lender and L/C Issuer By: /s/ Xxxxxxx Xxxxxx Xxxxx X. Xxxxx Name: Xxxxx X. Xxxxx Title: Vice President Fourth Amendment to Fourth Amended and Restated Credit Agreement DEUTSCHE BANK TRUST COMPANY AMERICAS, as a Lender By: /s/ X.X. Xxxxxxxx Xxx Name: X.X. Xxxxxxxx Xxx Title: Managing Director By: /s/ Xxxxxx Xxxxxxx Name: Xxxxxx Xxxxxxx Title: Assistant Vice President Fourth Amendment to Fourth Amended and Restated Credit Agreement JPMORGAN CHASE BANK, NA, as a Lender By: /s/ Xxxxx X. Xxxxxxx Name: Xxxxx X. Xxxxxxx Title: Senior Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: BMO XXXXXX BANK N.A.COMPASS BANK, as a Lender By:/s/ Xxxxx Xxxxxx By: Name: Xxxxx Xxxxxx Title: Vice President (Texas Oil COLORADO STATE BANK & Chemical Co. II, Inc.) LENDER: CAPITAL ONE, N.A.TRUST, as a Lender By:/s/ Xxxxx X. Xxxxxx By: Name: Xxxxx X. Xxxxxx Title: Senior Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: REGIONS BANKCOMERICA WEST INCORPORATED, as a Lender By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) DEPARTING LENDER: COMPASS BANK, as a Departing Lender By: /s/ Xxxxxxx Xxxxxx Name: Xxxxxxx Xxxxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) DEPARTING LENDER: SUNTRUST BANK, as a Departing Lender By: /s/ Xxxxxx Xxxx Name: Xxxxxx Xxxx Title: Director (Texas Oil & Chemical Co. II, Inc.) ANNEX A Corporate Banking Officer Fourth Amendment to Fourth Amended and Restated Credit Agreement ANNEX A Published CUSIP Number: 00000XXX0 AMENDED AND RESTATED CREDIT AGREEMENT Dated as of October 1, 2014 as amended by the First Amendment, dated as of February 20, 2015, by the Second Amendment, dated as of March 28, 2017, and by the Third Amendment, dated as of Jul 25, 2017; and as further amended as of July 31, 2018 among TEXAS OIL & CHEMICAL CO. II, INC., as Borrower, CERTAIN SUBSIDIARIES OF THE BORROWER PARTY HERETO, as Guarantors, BANK OF AMERICA, N.A., as Administrative Agent, Swingline Lender and an L/C Issuer, and CITIBANK, N.A., as an L/C Issuer, and THE LENDERS PARTY HERETO XXXXXXX LYNCH, PIERCE, XXXXXX & XXXXX INCORPORATED, and CITIBANK, N.A. as SoleJoint Lead ArrangerArrangers and Sole BookrunnerJoint Bookrunners BMO XXXXXX BANK N.A., as Syndication Agent 4326171v8 TABLE OF CONTENTS Page ARTICLE I DEFINITIONS AND ACCOUNTING TERMS 16 1.01 Defined Terms 16 1.02 Other Interpretive Provisions 3539Agreement

Signature Pages to Follow. This Amendment is executed as of the Effective Date. BORROWER: TEXAS OIL & CHEMICAL CO. IIVAIL HOLDINGS, INC. ., as the Company By: /s/ Xxxx Xxxxx Xxxxxxx X. Xxxxxx Name: Xxxx Xxxxx Xxxxxxx X. Xxxxxx Title: Treasurer GUARANTORS: SOUTH HAMPTON RESOURCES, INC. By: /s/ Xxxx Xxxxx Name: Xxxx Xxxxx Title: Treasurer GULF STATE PIPE LINE COMPANY, INC. By: /s/ Xxxx Xxxxx Name: Xxxx Xxxxx Title: Treasurer TRECORA CHEMICAL, INC. By: /s/ Xxxx Xxxxx Name: Xxxx Xxxxx Title: Treasurer (Texas Oil & Chemical Co. II, Inc.) ADMINISTRATIVE AGENT: Executive Vice President and Chief Financial Officer Third Amendment to Eighth Amended and Restated Credit Agreement BANK OF AMERICA, N.A., as Administrative Agent By: /s/ Xxxxxxx X. Xxxx Xxxxx Xxxxxxxx Name: Xxxxxxx X. Xxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: BANK OF AMERICA, N.A., as a Lender, L/C Issuer and Swingline Lender By: /s/ Xxxx Xxxx Xxxx Xxxx Senior Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: CITIBANK, N.A., as a Lender and L/C Issuer By: /s/ Xxxxxxx Xxxxxx Name: Xxxxxxx Xxxxxx Xxxxx Xxxxxxxx Title: Senior Vice President (Texas Oil & Chemical Co. IIBANK OF AMERICA, Inc.) LENDERN.A.,as an L/C Issuer, a Swing Line Lender, a Revolver Lender and a Term Loan Lender By: BMO XXXXXX /s/ Xxxxx Xxxxxxxx Name: Xxxxx Xxxxxxxx Title: Senior Vice President U.S. BANK N.A.NATIONAL ASSOCIATION,as a Swing Line Lender, a Revolver Lender and a Term Loan Lender By: /s/ Xxxxxxxx X. Xxxxxxx Name: Xxxxxxxx X. Xxxxxxx Title: Senior Vice President XXXXX FARGO BANK, NATIONAL ASSOCIATION, as an L/C Issuer, a Revolver Lender By:/s/ and a Term Loan Lender By: /s/ Xxxxx Xxxxxx Name: Xxxxx Xxxxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: CAPITAL ONE, N.A., as a Lender By:/s/ Xxxxx X. Xxxxxx Name: Xxxxx X. Xxxxxx Title: Senior Vice President TRUIST BANK (Texas Oil & Chemical Co. II, Inc.) LENDER: REGIONS BANK, as successor by merger to SUNTRUST BANK),as a Revolver Lender By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) DEPARTING LENDER: COMPASS BANK, as and a Departing Lender By: /s/ Xxxxxxx Xxxxxx Name: Xxxxxxx Xxxxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) DEPARTING LENDER: SUNTRUST BANK, as a Departing Term Loan Lender By: /s/ Xxxxxx Xxxx Name: Xxxxxx Xxxx Title: Director (Texas Oil BANK OF THE WEST,as a Revolver Lender and a Term Loan Lender By: /s/ Xxxxxxxx Xxx Name: Xxxxxxxx Xxx Title: Director, Corporate & Chemical Co. IIInvestment Banking BOKF, Inc.) ANNEX A NA DBA BOK FINANCIAL,as a Revolver Lender and a Term Loan Lender By: /s/ Xxxxx Risen Name: Xxxxx Risen Title: Vice President Third Amendment to Eighth Amended and Restated Credit Agreement ANNEX A Published CUSIP Number: 00000XXX0 AMENDED AND RESTATED CREDIT AGREEMENT Dated as of October 1, 2014 as amended by the First Amendment, dated as of February 20, 2015, by the Second Amendment, dated as of March 28, 2017, and by the Third Amendment, dated as of Jul 25, 2017; and as further amended as of July 31, 2018 among TEXAS OIL & CHEMICAL CO. II, INC., as Borrower, CERTAIN SUBSIDIARIES OF THE BORROWER PARTY HERETO, as Guarantors, BANK OF AMERICA, N.A., as Administrative Agent, Swingline Lender and an L/C Issuer, and CITIBANK, N.A., as an L/C Issuer, and THE LENDERS PARTY HERETO XXXXXXX LYNCH, PIERCE, XXXXXX & XXXXX INCORPORATED, and CITIBANK, N.A. as SoleJoint Lead ArrangerArrangers and Sole BookrunnerJoint Bookrunners BMO XXXXXX BANK N.A.N.A.,as a Revolver Lender and a Term Loan Lender By: /s/ Xxxxx Xxxx Name: Xxxxx Xxxx Title: Vice President Third Amendment to Eighth Amended and Restated Credit Agreement HSBC BANK USA, A NATIONAL ASSOCIATION,as Syndication Agent 4326171v8 TABLE OF CONTENTS Page ARTICLE I DEFINITIONS AND ACCOUNTING TERMS 16 1.01 Defined Terms 16 1.02 Other Interpretive Provisions 3539a Revolver Lender and a Term Loan Lender By: /s/ Xxxx Xxxxx Name: Xxxx Xxxxx Title: Global Relationship Manager Third Amendment to Eighth Amended and Restated Credit Agreement PNC BANK, NATIONAL ASSOCIATION,as a Revolver Lender and a Term Loan Lender By: /s/ Xxxx Xxxxxxxx Name: Xxxx Xxxxxxxx Title: Senior Vice President HSBC BANK AUSTRALIA LIMITED,as a Term Loan Lender By: /s/ Xxxxx Xxxxx Name: Xxxxx Xxxxx Title: Power of Attorney / Country Head of International Subsidiaries Third Amendment to Eighth Amended and Restated Credit Agreement

Signature Pages to Follow. This Amendment is executed as of the Effective Date. BORROWER: TEXAS OIL & CHEMICAL CO. II, INC. By: /s/ S. Xxxx Xxxxx Name: S. Xxxx Xxxxx Title: Treasurer GUARANTORS: SOUTH HAMPTON RESOURCES, INC. By: /s/ S. Xxxx Xxxxx Name: S. Xxxx Xxxxx Title: Treasurer GULF STATE PIPE LINE COMPANY, INC. By: /s/ S. Xxxx Xxxxx Name: S. Xxxx Xxxxx Title: Treasurer TRECORA CHEMICAL, INC. By: /s/ S. Xxxx Xxxxx Name: S. Xxxx Xxxxx Title: Treasurer (Texas Oil & Chemical Co. II, Inc.) ADMINISTRATIVE AGENT: BANK OF AMERICA, N.A., as Administrative Agent By: /s/ Xxxxxxx X. Xxxx Name: Xxxxxxx X. Xxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: BANK OF AMERICA, N.A., as a Lender, L/C Issuer and Swingline Lender By: /s/ Xxxx Xxxx Xxxx Xxxx Senior Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: CITIBANK, N.A., as a Lender and L/C Issuer By: /s/ Xxxxxxx Xxxxxx Name: Xxxxxxx Xxxxxx Title: Senior Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: BMO XXXXXX BANK N.A., as a Lender By:/s/ By: /s/ Xxxxx Xxxxxx Name: Xxxxx Xxxxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) Director LENDER: CAPITAL ONE, N.A., as a Lender By:/s/ By: /s/ Xxxxx X. Xxxxxx Name: Xxxxx X. Xxxxxx Title: Senior Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: REGIONS BANK, as a Lender By: /s/ Xxxxxx X. Xxxxx X Xxxxxxxx-Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) DEPARTING LENDER: COMPASS BANK, as a Departing Lender By: /s/ Xxxxxxx Xxxxxx Name: Xxxxxxx Xxxxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) DEPARTING LENDER: SUNTRUST BANK, as a Departing Lender By: /s/ Xxxxxx Xxxx Name: Xxxxxx Xxxx Title: Director (Texas Oil & Chemical Co. II, Inc.) ANNEX A Amended and Restated Credit Agreement ANNEX A Published CUSIP Number: 00000XXX0 AMENDED AND RESTATED CREDIT AGREEMENT Dated as of October 1, 2014 as amended by the First Amendment, dated as of February 20, 2015, by the Second Amendment, dated as of March 28, 2017, and by the Third Amendment, dated as of Jul 25, 2017; and as further amended as of July 31, 2018 among TEXAS OIL & CHEMICAL CO. II, INC., as Borrower, CERTAIN SUBSIDIARIES OF THE BORROWER PARTY HERETO, as Guarantors, BANK OF AMERICA, N.A., as Administrative Agent, Swingline Lender and an L/C Issuer, and CITIBANK, N.A., as an L/C Issuer, and THE LENDERS PARTY HERETO XXXXXXX LYNCH, PIERCE, XXXXXX & XXXXX INCORPORATED, and CITIBANK, N.A. as SoleJoint Lead ArrangerArrangers and Sole BookrunnerJoint Bookrunners BMO XXXXXX BANK N.A., as Syndication Agent 4326171v8 TABLE OF CONTENTS Page ARTICLE I DEFINITIONS AND ACCOUNTING TERMS 16 1.01 Defined Terms 16 1.02 Other Interpretive Provisions 3539Xxxxx X Xxxxxxxx-Xxxxxx

Signature Pages to Follow. 4827-1300-3463 v.5 This Amendment is executed as of the Effective Date. BORROWER: TEXAS OIL & CHEMICAL CO. IIRIGNET, INC. ., a Delaware corporation By: /s/ Xxx Xxxxxxxx Name: Xxx Xxxxxxxx Title: Chief Financial Officer GUARANTORS: LANDTEL, INC., a Delaware corporation By: /s/ Xxxx Xxxxx Xxxxxxx Name: Xxxx Xxxxx Xxxxxxx Title: Treasurer GUARANTORS: SOUTH HAMPTON RESOURCESVice President RIGNET SATCOM, INC. ., a Delaware corporation By: /s/ Xxxx Xxxxx Xxxxxxx Name: Xxxx Xxxxx Xxxxxxx Title: Treasurer GULF STATE PIPE LINE COMPANYVice President LANDTEL COMMUNICATIONS, INC. L.L.C., a Louisiana limited liability company By: /s/ Xxxx Xxxxx Xxxxxxx Name: Xxxx Xxxxx Xxxxxxx Title: Treasurer TRECORA CHEMICALVice President Fourth Amendment to Third Amended and Restated Credit Agreement AUTOMATION-COMMUNICATIONS- ENGINEERING CORPORATION, INC. a Louisiana corporation By: /s/ Xxxx Xxxxx Xxxxxxx Name: Xxxx Xxxxx Xxxxxxx Title: Treasurer (Texas Oil & Chemical Co. IIVice President SAFETY CONTROLS, Inc.) INC., a Louisiana corporation By: /s/ Xxxx Xxxxxxx Name: Xxxx Xxxxxxx Title: Vice President Fourth Amendment to Third Amended and Restated Credit Agreement ADMINISTRATIVE AGENT: BANK OF AMERICA, N.A., as Administrative Agent By: /s/ Xxxxxxx X. Xxxx Xxxxxx Xxxxx Name: Xxxxxxx X. Xxxx Xxxxxx Xxxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) Fourth Amendment to Third Amended and Restated Credit Agreement LENDER: BANK OF AMERICA, N.A., as a Lender, L/C Issuer and Swingline Lender By: /s/ Xxxx Xxxx Xxxx Xxxx Xxxxxxx Xxxxx Name: Xxxxxxx Xxxxx Title: Senior Vice President (Texas Oil & Chemical Co. II, Inc.) Fourth Amendment to Third Amended and Restated Credit Agreement LENDER: CITIBANK, N.A.BBVA USA (formerly Compass Bank), as a Lender and L/C Issuer By: /s/ Xxxxxxx Xxx Xxxxxx Name: Xxxxxxx /s/ Xxx Xxxxxx Title: Senior Vice President (Texas Oil & Chemical Co. II, Inc.) Fourth Amendment to Third Amended and Restated Credit Agreement LENDER: BMO XXXXXX BANK N.A., as a Lender By:/s/ Xxxxx Xxxxxx Name: Xxxxx Xxxxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: CAPITAL ONE, N.A., as a Lender By:/s/ Xxxxx X. Xxxxxx Name: Xxxxx X. Xxxxxx Title: Senior Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: REGIONS WOODFOREST NATIONAL BANK, as a Lender By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) DEPARTING LENDER: COMPASS BANK, as a Departing Lender By: /s/ Xxxxxxx Xxxxxx Name: Xxxxxxx Xxxxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) DEPARTING LENDER: SUNTRUST BANK, as a Departing Lender By: /s/ Xxxxxx Xxxxx Xxxx Name: Xxxxxx Xxxxx Xxxx Title: Director (Texas Oil & Chemical Co. II, Inc.) ANNEX A SVP Fourth Amendment to Third Amended and Restated Credit Agreement ANNEX A Published CUSIP NumberLENDER: 00000XXX0 AMENDED AND RESTATED CREDIT AGREEMENT Dated as of October 1, 2014 as amended by the First Amendment, dated as of February 20, 2015, by the Second Amendment, dated as of March 28, 2017, and by the Third Amendment, dated as of Jul 25, 2017; and as further amended as of July 31, 2018 among TEXAS OIL & CHEMICAL CO. II, INC.FIRST HORIZON BANK, as Borrower, CERTAIN SUBSIDIARIES OF THE BORROWER PARTY HERETO, as Guarantors, BANK OF AMERICA, N.A., as Administrative Agent, Swingline a Lender and an L/C Issuer, and CITIBANK, N.A., as an L/C Issuer, and THE LENDERS PARTY HERETO XXXXXXX LYNCH, PIERCE, XXXXXX & XXXXX INCORPORATED, and CITIBANK, N.A. as SoleJoint Lead ArrangerArrangers and Sole BookrunnerJoint Bookrunners BMO XXXXXX BANK N.A., as Syndication Agent 4326171v8 TABLE OF CONTENTS Page ARTICLE I DEFINITIONS AND ACCOUNTING TERMS 16 1.01 Defined Terms 16 1.02 Other Interpretive Provisions 3539By: /s/ Xxxxx X’Xxxxx Name: Xxxxx X’Xxxxx Title: Senior Vice President

Signature Pages to Follow. This Amendment is executed as of the Effective Date. BORROWER: TEXAS OIL & CHEMICAL CO. IIVAIL HOLDINGS, INC. ., as the Company By: /s/ Xxxx Xxxxx Xxxxxxx X. Xxxxxx Name: Xxxx Xxxxx Xxxxxxx X. Xxxxxx Title: Treasurer GUARANTORS: SOUTH HAMPTON RESOURCES, INC. By: /s/ Xxxx Xxxxx Name: Xxxx Xxxxx Title: Treasurer GULF STATE PIPE LINE COMPANY, INC. By: /s/ Xxxx Xxxxx Name: Xxxx Xxxxx Title: Treasurer TRECORA CHEMICAL, INC. By: /s/ Xxxx Xxxxx Name: Xxxx Xxxxx Title: Treasurer (Texas Oil & Chemical Co. II, Inc.) ADMINISTRATIVE AGENT: Executive Vice President and Chief Financial Officer Fourth Amendment to Eighth Amended and Restated Credit Agreement BANK OF AMERICA, N.A., as Administrative Agent By: /s/ Xxxxxxx X. Xxxx Xxxxx Xxxxxxxx Name: Xxxxxxx X. Xxxx Xxxxx Xxxxxxxx Title: Senior Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: BANK OF AMERICA, N.A., as a Lender, an L/C Issuer Issuer, a Swing Line Lender, a Revolver Lender and Swingline a Term Loan Lender By: /s/ Xxxxx Xxxxxxxx Name: Xxxxx Xxxxxxxx Title: Senior Vice President U.S. BANK NATIONAL ASSOCIATION, as a Swing Line Lender, a Revolver Lender and a Term Loan Lender By: /s/ Xxxx Xxxx Xxxx Xxxx Senior Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: CITIBANK, N.A., as a Lender and L/C Issuer By: /s/ Xxxxxxx Xxxxxx X. Xxxxxxxxx Name: Xxxxxxx Xxxxxx Xxxx X. Xxxxxxxxx Title: Senior Vice President (Texas Oil & Chemical Co. IIFourth Amendment to Eighth Amended and Restated Credit Agreement XXXXX FARGO BANK, Inc.) LENDER: BMO XXXXXX BANK N.A.NATIONAL ASSOCIATION, as an L/C Issuer, a Revolver Lender By:/s/ and a Term Loan Lender By: /s/ Xxxxx Xxxxxx Name: Xxxxx Xxxxxx Title: Senior Vice President TRUIST BANK (Texas Oil & Chemical Co. II, Inc.) LENDER: CAPITAL ONE, N.A.as successor by merger to SUNTRUST BANK), as a Revolver Lender By:/s/ Xxxxx X. Xxxxxx Name: Xxxxx X. Xxxxxx Title: Senior Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: REGIONS BANK, as and a Lender By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) DEPARTING LENDER: COMPASS BANK, as a Departing Lender By: /s/ Xxxxxxx Xxxxxx Name: Xxxxxxx Xxxxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) DEPARTING LENDER: SUNTRUST BANK, as a Departing Term Loan Lender By: /s/ Xxxxxx Xxxx Name: Xxxxxx Xxxx Title: Director (Texas Oil & Chemical Co. II, Inc.) ANNEX A Amended and Restated Credit Agreement ANNEX A Published CUSIP Number: 00000XXX0 AMENDED AND RESTATED CREDIT AGREEMENT Dated as of October 1, 2014 as amended by the First Amendment, dated as of February 20, 2015, by the Second Amendment, dated as of March 28, 2017, and by the Third Amendment, dated as of Jul 25, 2017; and as further amended as of July 31, 2018 among TEXAS OIL & CHEMICAL CO. II, INC.BANK OF THE WEST, as Borrowera Revolver Lender and a Term Loan Lender By: /s/ Xxxxxx X. Xxxxx Name: Xxxxxx X. Xxxxx Title: Managing Director BOKF, CERTAIN SUBSIDIARIES OF THE BORROWER PARTY HERETONA DBA BOK FINANCIAL, as Guarantors, BANK OF AMERICA, N.A., as Administrative Agent, Swingline a Revolver Lender and an L/C Issuer, and CITIBANK, N.A., as an L/C Issuer, and THE LENDERS PARTY HERETO XXXXXXX LYNCH, PIERCE, XXXXXX & XXXXX INCORPORATED, and CITIBANK, N.A. as SoleJoint Lead ArrangerArrangers and Sole BookrunnerJoint Bookrunners a Term Loan Lender By: /s/ Xxxxxxx X. Xxxxx Name: Xxxxxxx X. Xxxxx Title: Senior Vice President BMO XXXXXX BANK N.A., as Syndication Agent 4326171v8 TABLE OF CONTENTS Page ARTICLE I DEFINITIONS AND ACCOUNTING TERMS 16 1.01 Defined Terms 16 1.02 Other Interpretive Provisions 3539a Revolver Lender and a Term Loan Lender By: /s/ Xxxxx Xxxx Name: Xxxxx Xxxx Title: Director HSBC BANK USA, A NATIONAL ASSOCIATION, as a Revolver Lender and a Term Loan Lender By: /s/ Xxxx Xxxxx Name: Xxxx Xxxxx Title: Global Relationship Manager Fourth Amendment to Eighth Amended and Restated Credit Agreement PNC BANK, NATIONAL ASSOCIATION, as a Revolver Lender and a Term Loan Lender By: /s/ Xxxx Xxxxxxxx Name: Xxxx Xxxxxxxx Title: Senior Vice President HSBC BANK AUSTRALIA LIMITED, as a Term Loan Lender, For and on behalf of HSBC BANK AUSTRALIA LIMITED by its duly authorised attorney pursuant to a power of attorney in the presence of By: /s/ Xxxxx Xxxxx Name: Xxxxx Xxxxx Title: Attorney /s/ Xxxxxx Mill Name: Xxxxxx Mill Title: Witness Fourth Amendment to Eighth Amended and Restated Credit Agreement

Signature Pages to Follow. This Amendment is executed as of the Effective Date. BORROWER: TEXAS OIL & CHEMICAL CO. II8 VAIL HOLDINGS, INC. ., as the Company By: /s/ Xxxx Xxxxx Xxxxxxx X. Xxxxxx Name: Xxxx Xxxxx Xxxxxxx X. Xxxxxx Title: Treasurer GUARANTORS: SOUTH HAMPTON RESOURCES, INC. By: /s/ Xxxx Xxxxx Name: Xxxx Xxxxx Title: Treasurer GULF STATE PIPE LINE COMPANY, INC. By: /s/ Xxxx Xxxxx Name: Xxxx Xxxxx Title: Treasurer TRECORA CHEMICAL, INC. By: /s/ Xxxx Xxxxx Name: Xxxx Xxxxx Title: Treasurer (Texas Oil Executive Vice President & Chemical Co. II, Inc.) ADMINISTRATIVE AGENT: Chief Financial Officer Second Amendment to Eighth Amended and Restated Credit Agreement BANK OF AMERICA, N.A., as Administrative Agent By: /s/ Xxxxxxx X. Xxxx Xxxxx Xxxxxxxx Name: Xxxxxxx X. Xxxx Xxxxx Xxxxxxxx Title: Senior Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: BANK OF AMERICA, N.A., as a Lender, an L/C Issuer issuer, a Swing Line Lender, a Revolver Lender and Swingline a Term Loan Lender By: /s/ Xxxxx Xxxxxxxx Name: Xxxxx Xxxxxxxx Title: Senior Vice President U.S. BANK NATIONAL ASSOCIATION, as a Swing Line Lender, a Revolver Lender and a Term Loan Lender By: /s/ Xxxx Xxxxxxxxx Name: Xxxx Xxxx Xxxx Senior Xxxxxxxxx Title: Vice President (Texas Oil & Chemical Co. IISecond Amendment to Eighth Amended and Restated Credit Agreement XXXXX FARGO BANK, Inc.) LENDER: CITIBANK, N.A., NATIONAL ASSOCIATION as a Lender and an L/C Issuer Issuer, a Revolver Lender and a Term Loan Lender By: /s/ Xxxxxxx Xxxxxx Name: Xxxxxxx Xxxxxx Title: Senior Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: BMO XXXXXX BANK N.A., as a Lender By:/s/ Xxxxx Xxxxxx Name: Xxxxx Xxxxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: CAPITAL ONE, N.A., as a Lender By:/s/ Xxxxx X. Xxxxxx Name: Xxxxx X. Xxxxxx Title: Senior Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: REGIONS BANK, SUNTRUST BANK as a Revolver Lender By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) DEPARTING LENDER: COMPASS BANK, as and a Departing Lender By: /s/ Xxxxxxx Xxxxxx Name: Xxxxxxx Xxxxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) DEPARTING LENDER: SUNTRUST BANK, as a Departing Term Loan Lender By: /s/ Xxxxxx Xxxx Name: Xxxxxx Xxxx Title: Director (Texas Oil & Chemical Co. II, Inc.) ANNEX A Second Amendment to Eighth Amended and Restated Credit Agreement ANNEX A Published CUSIP Number: 00000XXX0 AMENDED AND RESTATED CREDIT AGREEMENT Dated as of October 1, 2014 as amended by the First Amendment, dated as of February 20, 2015, by the Second Amendment, dated as of March 28, 2017, and by the Third Amendment, dated as of Jul 25, 2017; and as further amended as of July 31, 2018 among TEXAS OIL & CHEMICAL CO. II, INC.BANK OF THE WEST, as Borrower, CERTAIN SUBSIDIARIES OF THE BORROWER PARTY HERETO, as Guarantors, BANK OF AMERICA, N.A., as Administrative Agent, Swingline a Revolver Lender and an L/C Issuera Term Loan Lender By: /s/ Xxxxxx Xxxxx Name: Xxxxxx Xxxxx Title: Director Second Amendment to Eighth Amended and Restated Credit Agreement BOKF, NA DBA BOK FINANCIAL as a Revolver Lender and CITIBANK, N.A., as an L/C Issuer, and THE LENDERS PARTY HERETO XXXXXXX LYNCH, PIERCE, XXXXXX & XXXXX INCORPORATED, and CITIBANK, N.A. as SoleJoint Lead ArrangerArrangers and Sole BookrunnerJoint Bookrunners a Term Loan Lender By: /s/ Xxxxx Xxxxx Name: Xxxxx Xxxxx Title: Vice President BMO XXXXXX BANK N.A., as Syndication Agent 4326171v8 TABLE OF CONTENTS Page ARTICLE I DEFINITIONS AND ACCOUNTING TERMS 16 1.01 Defined Terms 16 1.02 Other Interpretive Provisions 3539a Revolver Lender and a Term Loan Lender By: /s/ Xxxxx Xxxxx Name: Xxxxx Xxxxx Title: Director Second Amendment to Eighth Amended and Restated Credit Agreement HSBC BANK USA, NATIONAL ASSOCIATION, as a Revolver Lender and a Term Loan Lender By: /s/ Xxxx Xxxxx Name: Xxxx Xxxxx Title: Global Relationship Manager Second Amendment to Eighth Amended and Restated Credit Agreement PNC BANK, NATIONAL ASSOCIATION, as a New Lender By: /s/ Xxxx Xxxxx Name: Xxxx Xxxxx Title: AVP Second Amendment to Eighth Amended and Restated Credit Agreement HSBC BANK AUSTRALIA LIMITED, as a New Lender For and on behalf of HSBC BANK USA, NATIONAL ASSOCIATION, its duly authorized attorney pursuant to a power of attorney in the presence of By: /s/ Xxxxx Xxxxx Name: Xxxxx Xxxxx Title: Attorney /s/ Weng Hang Xxx Xxxxxxxx Name: Weng Hang Xxx Xxxxxxxx Title: Witness Second Amendment to Eighth Amended and Restated Credit Agreement

Signature Pages to Follow. This Amendment is executed as of the Effective Date. BORROWER: TEXAS OIL & CHEMICAL CO. IITHE VAIL CORPORATION (D/B/A “VAIL ASSOCIATES, INC. .”), as Borrower By: /s/ Xxxx Xxxxx /s/Jxxxxxx X.Xxxxx Name: Xxxx Jxxxxxx X. Xxxxx Title: Treasurer GUARANTORS: SOUTH HAMPTON RESOURCES, INC. By: /s/ Xxxx Xxxxx Name: Xxxx Xxxxx Title: Treasurer GULF STATE PIPE LINE COMPANY, INC. By: /s/ Xxxx Xxxxx Name: Xxxx Xxxxx Title: Treasurer TRECORA CHEMICAL, INC. By: /s/ Xxxx Xxxxx Name: Xxxx Xxxxx Title: Treasurer (Texas Oil & Chemical Co. II, Inc.) ADMINISTRATIVE AGENT: Senior Executive Vice President and Chief Financial Officer BANK OF AMERICA, N.A., as Administrative Agent By: /s/ Xxxxxxx X. Xxxx /s/Dxxxx XxXxxxxx Name: Xxxxxxx X. Xxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: BANK OF AMERICA, N.A., as a Lender, L/C Issuer and Swingline Lender By: /s/ Xxxx Xxxx Xxxx Xxxx Senior Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: CITIBANK, N.A., as a Lender and L/C Issuer By: /s/ Xxxxxxx Xxxxxx Name: Xxxxxxx Xxxxxx Dxxxx XxXxxxxx Title: Senior Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: BMO XXXXXX BANK N.A., as a Lender By:/s/ Xxxxx Xxxxxx Name: Xxxxx Xxxxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: CAPITAL ONE, N.A., as a Lender By:/s/ Xxxxx X. Xxxxxx Name: Xxxxx X. Xxxxxx Title: Senior Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: REGIONS BANK, as a Lender By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) DEPARTING LENDER: COMPASS BANK, as a Departing Lender By: /s/ Xxxxxxx Xxxxxx Name: Xxxxxxx Xxxxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) DEPARTING LENDER: SUNTRUST BANK, as a Departing Lender By: /s/ Xxxxxx Xxxx Name: Xxxxxx Xxxx Title: Director (Texas Oil & Chemical Co. II, Inc.) ANNEX A Amended and Restated Credit Agreement ANNEX A Published CUSIP Number: 00000XXX0 AMENDED AND RESTATED CREDIT AGREEMENT Dated as of October 1, 2014 as amended by the First Amendment, dated as of February 20, 2015, by the Second Amendment, dated as of March 28, 2017, and by the Third Amendment, dated as of Jul 25, 2017; and as further amended as of July 31, 2018 among TEXAS OIL & CHEMICAL CO. II, INC., as Borrower, CERTAIN SUBSIDIARIES OF THE BORROWER PARTY HERETO, as Guarantors, BANK OF AMERICA, N.A., as Administrative Agent, Swingline Lender and an L/C Issuer, and CITIBANK, N.A., as an L/C Issuer, and THE LENDERS PARTY HERETO XXXXXXX LYNCH, PIERCE, XXXXXX & XXXXX INCORPORATEDa Swing Line Lender, and CITIBANKa Lender By: /s/Dxxxx XxXxxxxx Name: Dxxxx XxXxxxxx Title: Senior Vice President U.S. BANK NATIONAL ASSOCIATION, N.A. as SoleJoint Lead ArrangerArrangers a Swing Line Lender and Sole BookrunnerJoint Bookrunners BMO XXXXXX BANK a Lender By: /s/Gxxx Xxxxxxxxx Name: Gxxx Xxxxxxxxx Title: Vice President WXXXX FARGO BANK, NATIONAL ASSOCIATION, as an L/C Issuer and a Lender By: /s/Nxxxxx Xxxxxxxxx Name: Nxxxxx Xxxxxxxxx Title: Vice President JPMORGAN CHASE BANK, N.A., as Syndication Agent 4326171v8 TABLE a Lender By: /s/Bxxxxxx Xxxxxxx Name: Bxxxxxx Xxxxxxx Title: Senior Underwriter DEUTSCHE BANK TRUST COMPANY AMERICAS, as a Lender By: /s/Jxxxx Xxxxxxx Name: Jxxxx Xxxxxxx Title: Managing Director By: /s/Pxxxx Xxxxxx Name: Pxxxx Xxxxxx Title: Director COMPASS BANK, as a Lender By: /s/Exxx Xxxx Name: Exxx Xxxx Title: Senior Vice President BOKF, N.A. DBA COLORADO STATE BANK & TRUST, as a Lender By: /s/Kxxx Xxxxxxx Name: Kxxx Xxxxxxx Title: Senior Vice President COMERICA BANK, as a Lender By: /s/Mxxx X. Xxxxxxxxx Name: Mxxx X. Xxxxxxxxx Title: Assistant Vice President BANK OF CONTENTS Page ARTICLE I DEFINITIONS AND ACCOUNTING TERMS 16 1.01 Defined Terms 16 1.02 Other Interpretive Provisions 3539THE WEST, as a Lender By: /s/Gxxx Xxxxxx Name: Gxxx Xxxxxx Title: Senior Vice President

Signature Pages to Follow. This Amendment is executed as of the Effective Date. BORROWER: TEXAS OIL & CHEMICAL CO. IITHE VAIL CORPORATION (D/B/A “VAIL ASSOCIATES, INC. .”), as the Company By: /s/ Xxxx Xxxxx Xxxxxxx X. Xxxxxx Name: Xxxx Xxxxx Xxxxxxx X. Xxxxxx Title: Treasurer GUARANTORS: SOUTH HAMPTON RESOURCES, INC. By: /s/ Xxxx Xxxxx Name: Xxxx Xxxxx Title: Treasurer GULF STATE PIPE LINE COMPANY, INC. By: /s/ Xxxx Xxxxx Name: Xxxx Xxxxx Title: Treasurer TRECORA CHEMICAL, INC. By: /s/ Xxxx Xxxxx Name: Xxxx Xxxxx Title: Treasurer (Texas Oil & Chemical Co. II, Inc.) ADMINISTRATIVE AGENT: Executive Vice President and Chief Financial Officer Fifth Amended and Restated Credit Agreement BANK OF AMERICA, N.A., as Administrative Agent By: /s/ Xxxxxxx X. Xxxx Name: Xxxxxxx X. Xxxx Title: Xxxxxx Naval Ronaldo Naval Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: BANK OF AMERICA, N.A., as a Lender, L/C Issuer and Swingline Lender By: /s/ Xxxx Xxxx Xxxx Xxxx Senior Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: CITIBANK, N.A., as a Lender and L/C Issuer By: /s/ Xxxxxxx Xxxxxx Name: Xxxxxxx Xxxxxx Title: Senior Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: BMO XXXXXX BANK N.A., as a Lender By:/s/ Xxxxx Xxxxxx Name: Xxxxx Xxxxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: CAPITAL ONE, N.A., as a Lender By:/s/ Xxxxx X. Xxxxxx Name: Xxxxx X. Xxxxxx Title: Senior Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: REGIONS BANK, as a Lender By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) DEPARTING LENDER: COMPASS BANK, as a Departing Lender By: /s/ Xxxxxxx Xxxxxx Name: Xxxxxxx Xxxxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) DEPARTING LENDER: SUNTRUST BANK, as a Departing Lender By: /s/ Xxxxxx Xxxx Name: Xxxxxx Xxxx Title: Director (Texas Oil & Chemical Co. II, Inc.) ANNEX A Fifth Amended and Restated Credit Agreement ANNEX A Published CUSIP Number: 00000XXX0 AMENDED AND RESTATED CREDIT AGREEMENT Dated as of October 1, 2014 as amended by the First Amendment, dated as of February 20, 2015, by the Second Amendment, dated as of March 28, 2017, and by the Third Amendment, dated as of Jul 25, 2017; and as further amended as of July 31, 2018 among TEXAS OIL & CHEMICAL CO. II, INC., as Borrower, CERTAIN SUBSIDIARIES OF THE BORROWER PARTY HERETO, as Guarantors, BANK OF AMERICA, N.A., as Administrative Agent, Swingline Lender and an L/C Issuer, and CITIBANK, N.A., as an L/C Issuer, and THE LENDERS PARTY HERETO XXXXXXX LYNCH, PIERCE, XXXXXX & XXXXX INCORPORATEDa Swing Line Lender, and CITIBANKa Lender By: /s/ Xxxxx XxXxxxxx Xxxxx XxXxxxxx Senior Vice President Fifth Amended and Restated Credit Agreement U.S. BANK NATIONAL ASSOCIATION, N.A. as SoleJoint Lead ArrangerArrangers a Swing Line Lender and Sole BookrunnerJoint Bookrunners BMO XXXXXX BANK a Lender By: /s/ Xxxx Xxxxxxxxx Name: Xxxx Xxxxxxxxx Title: Vice President Fifth Amended and Restated Credit Agreement XXXXX FARGO BANK, NATIONAL ASSOCIATION, as an L/C Issuer and a Lender By: /s/ Xxxxxx Xxxxxxxxx Name: Xxxxxx Xxxxxxxxx Title: SVP Third Amendment to Fifth Amended and Restated Credit Agreement JPMORGAN CHASE BANK, N.A., as Syndication Agent 4326171v8 TABLE OF CONTENTS Page ARTICLE I DEFINITIONS AND ACCOUNTING TERMS 16 1.01 Defined Terms 16 1.02 Other Interpretive Provisions 3539a Lender By: /s/ Xxxxxxx Xxxxxxx Name: Xxxxxxx Xxxxxxx Title: Vice President Fifth Amended and Restated Credit Agreement COMPASS BANK, as a Lender By: /s/ Xxxxx X. Xxxxx Name: Xxxxx X. Xxxxx Title: Vice President Fifth Amended and Restated Credit Agreement COMERICA BANK, as a Lender By: /s/ Xxxxxx Xxxxxx Name: Xxxxxx Xxxxxx Title: Vice President Fifth Amended and Restated Credit Agreement

Signature Pages to Follow. This Amendment is executed as of the Effective Date. BORROWER: TEXAS OIL & CHEMICAL CO. II, INC. By: /s/ S. Xxxx Xxxxx Name: S. Xxxx Xxxxx Title: Treasurer GUARANTORS: SOUTH HAMPTON RESOURCES, INC. By: /s/ S. Xxxx Xxxxx Name: S. Xxxx Xxxxx Title: Treasurer GULF STATE PIPE LINE COMPANY, INC. By: /s/ S. Xxxx Xxxxx Name: S. Xxxx Xxxxx Title: Treasurer TRECORA CHEMICAL, INC. By: /s/ S. Xxxx Xxxxx Name: S. Xxxx Xxxxx Title: Treasurer (Texas Oil & Chemical Co. II, Inc.) ADMINISTRATIVE AGENT: BANK OF AMERICA, N.A., as Administrative Agent By: /s/ Xxxxxxx X. Xxxx Name: Xxxxxxx X. Xxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: BANK OF AMERICA, N.A., as a Lender, L/C Issuer and Swingline Lender By: /s/ Xxxx Xxxx Xxxx Xxxx Senior Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: CITIBANK, N.A., as a Lender and L/C Issuer By: /s/ Xxxxxxx Xxxxxx Name: Xxxxxxx Xxxxxx Title: Senior Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: BMO XXXXXX BANK N.A., as a Lender By:/s/ By: /s/ Xxxxx Xxxxxx Name: Xxxxx Xxxxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: CAPITAL ONE, N.A., as a Lender By:/s/ By: /s/ Xxxxx X. Xxxxxx III Name: Xxxxx X. Xxxxxx III Title: Senior Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: REGIONS BANK, as a Lender By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) DEPARTING LENDER: COMPASS BANK, as a Departing Lender By: /s/ Xxxxxxx Xxxxxx Name: Xxxxxxx Xxxxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) DEPARTING LENDER: SUNTRUST BANK, as a Departing Lender By: /s/ Xxxxxx Xxxx Name: Xxxxxx Xxxx Title: Director (Texas Oil & Chemical Co. II, Inc.) ANNEX A Amended and Restated Credit Agreement ANNEX A Published CUSIP Number: 00000XXX0 AMENDED AND RESTATED CREDIT AGREEMENT Dated as of October 1, 2014 as amended by the First Amendment, dated as of February 20, 2015, by the Second Amendment, dated as of March 28, 2017, and by the Third Amendment, dated as of Jul 25, 2017; and as further amended as of July 31, 2018 among TEXAS OIL & CHEMICAL CO. II, INC., as Borrower, CERTAIN SUBSIDIARIES OF THE BORROWER PARTY HERETO, as Guarantors, BANK OF AMERICA, N.A., as Administrative Agent, Swingline Lender and an L/C Issuer, and CITIBANK, N.A., as an L/C Issuer, and THE LENDERS PARTY HERETO XXXXXXX LYNCH, PIERCE, XXXXXX & XXXXX INCORPORATED, and CITIBANK, N.A. as SoleJoint Lead ArrangerArrangers and Sole BookrunnerJoint Bookrunners BMO XXXXXX BANK N.A., as Syndication Agent 4326171v8 TABLE OF CONTENTS Page ARTICLE I DEFINITIONS AND ACCOUNTING TERMS 16 1.01 Defined Terms 16 1.02 Other Interpretive Provisions 3539Xxxxxx

Signature Pages to Follow. This Amendment is executed as of the Effective Date. BORROWER: TEXAS OIL & CHEMICAL CO. IIVAIL HOLDINGS, INC. ., as the Company By: /s/ Xxxx Xxxxx Xxxxxxx X. Xxxxxx Name: Xxxx Xxxxx Xxxxxxx X. Xxxxxx Title: Treasurer GUARANTORS: SOUTH HAMPTON RESOURCES, INC. By: /s/ Xxxx Xxxxx Name: Xxxx Xxxxx Title: Treasurer GULF STATE PIPE LINE COMPANY, INC. By: /s/ Xxxx Xxxxx Name: Xxxx Xxxxx Title: Treasurer TRECORA CHEMICAL, INC. By: /s/ Xxxx Xxxxx Name: Xxxx Xxxxx Title: Treasurer (Texas Oil & Chemical Co. II, Inc.) ADMINISTRATIVE AGENT: Executive Vice President and Chief Financial Officer First Amendment to Seventh Amended and Restated Credit Agreement BANK OF AMERICA, N.A., as Administrative Agent By: /s/ Xxxxxxx X. Xxxx Name: Xxxxxxx X. Xxxx Title: Xxxxx XxXxxxxx Xxxxx XxXxxxxx Senior Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: First Amendment to Seventh Amended and Restated Credit Agreement BANK OF AMERICA, N.A., as a Lender, an L/C Issuer Issuer, a Swing Line Lender, a Revolver Lender and Swingline a Term Loan Lender By: /s/ Xxxxx XxXxxxxx Xxxxx XxXxxxxx Senior Vice President First Amendment to Seventh Amended and Restated Credit Agreement U.S. BANK NATIONAL ASSOCIATION, as a Swing Line Lender, a Revolver Lender and a Term Loan Lender By: /s/ Xxxx Xxxxxxxxx Name: Xxxx Xxxx Xxxx Senior Xxxxxxxxx Title: Vice President (Texas Oil & Chemical Co. IIFirst Amendment to Seventh Amended and Restated Credit Agreement XXXXX FARGO BANK, Inc.) LENDER: CITIBANK, N.A.NATIONAL ASSOCIATION, as a Lender and an L/C Issuer Issuer, a Revolver Lender and a Term Loan Lender By: /s/ Xxxxxxx Xxxxxx Name: Xxxxxxx Xxxxxx Title: Senior Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: BMO XXXXXX BANK N.A., as a Lender By:/s/ Xxxxx Xxxxxx Name: Xxxxx Xxxxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: CAPITAL ONE, N.A.First Amendment to Seventh Amended and Restated Credit Agreement COMPASS BANK, as a Revolver Lender By:/s/ By: /s/ Xxxxx X. Xxxxxx Xxxxx Name: Xxxxx X. Xxxxxx Xxxxx Title: Senior Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: REGIONS BANKFirst Amendment to Seventh Amended and Restated Credit Agreement BANK OF THE WEST, as a Revolver Lender and a Term Loan Lender By: /s/ Xxxxxx X. Xxxxxx Xxxxxxxxxxxx Name: Xxxxxx X. Xxxxxx Xxxxxxxxxxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) DEPARTING LENDER: COMPASS BANK, as a Departing Lender By: /s/ Xxxxxxx Xxxxxx Name: Xxxxxxx Xxxxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) DEPARTING LENDER: SUNTRUST BANK, as a Departing Lender By: /s/ Xxxxxx Xxxx Name: Xxxxxx Xxxx Title: Director (Texas Oil & Chemical Co. II, Inc.) ANNEX A First Amendment to Seventh Amended and Restated Credit Agreement ANNEX A Published CUSIP Number: 00000XXX0 AMENDED AND RESTATED CREDIT AGREEMENT Dated as of October 1, 2014 as amended by the First Amendment, dated as of February 20, 2015, by the Second Amendment, dated as of March 28, 2017, and by the Third Amendment, dated as of Jul 25, 2017; and as further amended as of July 31, 2018 among TEXAS OIL & CHEMICAL CO. II, INC., as Borrower, CERTAIN SUBSIDIARIES OF THE BORROWER PARTY HERETO, as Guarantors, BANK OF AMERICA, N.A., as Administrative Agent, Swingline Lender and an L/C Issuer, and CITIBANK, N.A., as an L/C Issuer, and THE LENDERS PARTY HERETO XXXXXXX LYNCH, PIERCE, XXXXXX & XXXXX INCORPORATED, and CITIBANK, N.A. as SoleJoint Lead ArrangerArrangers and Sole BookrunnerJoint Bookrunners BMO XXXXXX BANK N.A., as Syndication Agent 4326171v8 TABLE OF CONTENTS Page ARTICLE I DEFINITIONS AND ACCOUNTING TERMS 16 1.01 Defined Terms 16 1.02 Other Interpretive Provisions 3539Agreement

Signature Pages to Follow. This Amendment is executed as of the Effective Date. BORROWER: TEXAS OIL & CHEMICAL CO. II, INC. By: /s/ S. Xxxx Xxxxx Name: S. Xxxx Xxxxx Title: Treasurer GUARANTORS: SOUTH HAMPTON RESOURCES, INC. By: /s/ S. Xxxx Xxxxx Name: S. Xxxx Xxxxx Title: Treasurer GULF STATE PIPE LINE COMPANY, INC. By: /s/ S. Xxxx Xxxxx Name: S. Xxxx Xxxxx Title: Treasurer TRECORA CHEMICAL, INC. By: /s/ S. Xxxx Xxxxx Name: S. Xxxx Xxxxx Title: Treasurer Eighth Amendment to Amended and Restated Credit Agreement (Texas Oil & Chemical Co. II, Inc.) ADMINISTRATIVE AGENT: BANK OF AMERICA, N.A., as Administrative Agent By: /s/ Xxxxxxx X. Xxxx Name: Xxxxxxx X. Xxxx Title: Vice President Eighth Amendment to Amended and Restated Credit Agreement (Texas Oil & Chemical Co. II, Inc.) LENDER: BANK OF AMERICA, N.A., as a Lender, L/C Issuer and Swingline Lender By: /s/ Xxxx Xxxx Xxxx Xxxx Senior Vice President Eighth Amendment to Amended and Restated Credit Agreement (Texas Oil & Chemical Co. II, Inc.) LENDER: CITIBANK, N.A., as a Lender and L/C Issuer By: /s/ Xxxxxxx Xxxxxx Xxxxx Xxxxxxxxx Name: Xxxxxxx Xxxxxx Xxxxx Xxxxxxxxx Title: Senior Vice President Director – Head of Central Mid Corporate Banking Eighth Amendment to Amended and Restated Credit Agreement (Texas Oil & Chemical Co. II, Inc.) LENDER: BMO XXXXXX BANK N.A., as a Lender By:/s/ By: /s/ Xxxxx Xxxxxx Name: Xxxxx Xxxxxx Title: Vice President Director Eighth Amendment to Amended and Restated Credit Agreement (Texas Oil & Chemical Co. II, Inc.) LENDER: CAPITAL ONE, N.A., as a Lender By:/s/ By: /s/ Xxxxx X. Xxxxxx Name: Xxxxx X. Xxxxxx Title: Senior Vice President Eighth Amendment to Amended and Restated Credit Agreement (Texas Oil & Chemical Co. II, Inc.) LENDER: REGIONS BANK, as a Lender By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) DEPARTING LENDER: COMPASS BANK, as a Departing Lender By: /s/ Xxxxxxx Xxxxxx Name: Xxxxxxx Xxxxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) DEPARTING LENDER: SUNTRUST BANK, as a Departing Lender By: /s/ Xxxxxx Xxxx Name: Xxxxxx Xxxx Title: Director (Texas Oil & Chemical Co. II, Inc.) ANNEX A SVP Eighth Amendment to Amended and Restated Credit Agreement ANNEX A Published CUSIP Number: 00000XXX0 AMENDED AND RESTATED CREDIT AGREEMENT Dated as of October 1, 2014 as amended by the First Amendment, dated as of February 20, 2015, by the Second Amendment, dated as of March 28, 2017, and by the Third Amendment, dated as of Jul 25, 2017; and as further amended as of July 31, 2018 among TEXAS OIL & CHEMICAL CO. II, INC., as Borrower, CERTAIN SUBSIDIARIES OF THE BORROWER PARTY HERETO, as Guarantors, BANK OF AMERICA, N.A., as Administrative Agent, Swingline Lender and an L/C Issuer, and CITIBANK, N.A., as an L/C Issuer, and THE LENDERS PARTY HERETO XXXXXXX LYNCH, PIERCE, XXXXXX & XXXXX INCORPORATED, and CITIBANK, N.A. as SoleJoint Lead ArrangerArrangers and Sole BookrunnerJoint Bookrunners BMO XXXXXX BANK N.A., as Syndication Agent 4326171v8 TABLE OF CONTENTS Page ARTICLE I DEFINITIONS AND ACCOUNTING TERMS 16 1.01 Defined Terms 16 1.02 Other Interpretive Provisions 3539Agreement

Signature Pages to Follow. This Amendment is executed as of the Effective Date. BORROWER: TEXAS OIL & CHEMICAL CO. IITHE VAIL CORPORATION (D/B/A “VAIL ASSOCIATES, INC. .”), as the Company By: /s/ Xxxx Xxxxxxx X. Xxxxx Name: Xxxx Xxxxxxx X. Xxxxx Title: Treasurer GUARANTORS: SOUTH HAMPTON RESOURCES, INC. By: /s/ Xxxx Xxxxx Name: Xxxx Xxxxx Title: Treasurer GULF STATE PIPE LINE COMPANY, INC. By: /s/ Xxxx Xxxxx Name: Xxxx Xxxxx Title: Treasurer TRECORA CHEMICAL, INC. By: /s/ Xxxx Xxxxx Name: Xxxx Xxxxx Title: Treasurer (Texas Oil & Chemical Co. II, Inc.) ADMINISTRATIVE AGENT: Senior Executive Vice President and Chief Financial Officer BANK OF AMERICA, N.A., as Administrative Agent By: /s/ Xxxxxxx X. Xxxx Xxxxx XxXxxxxx Name: Xxxxxxx X. Xxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: BANK OF AMERICA, N.A., as a Lender, L/C Issuer and Swingline Lender By: /s/ Xxxx Xxxx Xxxx Xxxx Senior Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: CITIBANK, N.A., as a Lender and L/C Issuer By: /s/ Xxxxxxx Xxxxxx Name: Xxxxxxx Xxxxxx Xxxxx XxXxxxxx Title: Senior Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: BMO XXXXXX BANK N.A., as a Lender By:/s/ Xxxxx Xxxxxx Name: Xxxxx Xxxxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: CAPITAL ONE, N.A., as a Lender By:/s/ Xxxxx X. Xxxxxx Name: Xxxxx X. Xxxxxx Title: Senior Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: REGIONS BANK, as a Lender By: /s/ Xxxxxx X. Xxxxxx Name: Xxxxxx X. Xxxxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) DEPARTING LENDER: COMPASS BANK, as a Departing Lender By: /s/ Xxxxxxx Xxxxxx Name: Xxxxxxx Xxxxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) DEPARTING LENDER: SUNTRUST BANK, as a Departing Lender By: /s/ Xxxxxx Xxxx Name: Xxxxxx Xxxx Title: Director (Texas Oil & Chemical Co. II, Inc.) ANNEX A Amended and Restated Credit Agreement ANNEX A Published CUSIP Number: 00000XXX0 AMENDED AND RESTATED CREDIT AGREEMENT Dated as of October 1, 2014 as amended by the First Amendment, dated as of February 20, 2015, by the Second Amendment, dated as of March 28, 2017, and by the Third Amendment, dated as of Jul 25, 2017; and as further amended as of July 31, 2018 among TEXAS OIL & CHEMICAL CO. II, INC., as Borrower, CERTAIN SUBSIDIARIES OF THE BORROWER PARTY HERETO, as Guarantors, BANK OF AMERICA, N.A., as Administrative Agent, Swingline Lender and an L/C Issuer, and CITIBANK, N.A., as an L/C Issuer, and THE LENDERS PARTY HERETO XXXXXXX LYNCH, PIERCE, XXXXXX & XXXXX INCORPORATEDa Swing Line Lender, and CITIBANKa Lender By: /s/ Xxxxx XxXxxxxx Name: Xxxxx XxXxxxxx Title: Senior Vice President U.S. BANK NATIONAL ASSOCIATION, N.A. as SoleJoint Lead ArrangerArrangers a Swing Line Lender and Sole BookrunnerJoint Bookrunners BMO XXXXXX BANK a Lender By: /s/ Xxxx Xxxxxxxxx Name: Xxxx Xxxxxxxxx Title: Vice President XXXXX FARGO BANK, NATIONAL ASSOCIATION, as an L/C Issuer and a Lender By: /s/ Xxxxxx Xxxxxxxxx Name: Xxxxxx Xxxxxxxxx Title: Vice President JPMORGAN CHASE BANK, N.A., as Syndication Agent 4326171v8 TABLE a Lender By: /s/ Xxxxxx X. Xxxxxxxx Name: Xxxxxx X. Xxxxxxxx Title: Managing Director COMPASS BANK, as a Lender By: /s/ Xxxx Xxxx Name: Xxxx Xxxx Title: Senior Vice President COMERICA BANK, as a Lender By: /s/ Xxxxxx Xxxxxx Name: Xxxxxx Xxxxxx Title: Vice President BANK OF CONTENTS Page ARTICLE I DEFINITIONS AND ACCOUNTING TERMS 16 1.01 Defined Terms 16 1.02 Other Interpretive Provisions 3539THE WEST, as a Lender By: /s/ Xxx Xxxxx Name: Xxx Xxxxx Title: Vice President

Signature Pages to Follow. This The parties are signing this Sixth Amendment is executed to Credit Agreement as of the Effective Datedate stated in the introductory clause. BORROWER: TEXAS OIL & CHEMICAL CO. IIBOISE CASCADE COMPANY, INC. a Delaware corporation, as a Borrower By: /s/ Xxxx Xxxxx Xxxxx Name: Xxxx Xxxxx Title: Treasurer GUARANTORS: SOUTH HAMPTON RESOURCES, INC. By: /s/ Xxxx Xxxxx Name: Xxxx Xxxxx Title: Treasurer GULF STATE PIPE LINE COMPANY, INC. By: /s/ Xxxx Xxxxx Name: Xxxx Xxxxx Title: Treasurer TRECORA CHEMICAL, INC. By: /s/ Xxxx Xxxxx Name: Xxxx Xxxxx Title: Treasurer (Texas Oil & Chemical Co. II, Inc.) ADMINISTRATIVE AGENT: BANK OF AMERICA, N.A., as Administrative Agent By: /s/ Xxxxxxx X. Xxxx Name: Xxxxxxx X. Xxxx Title: Vice President (Texas Oil & Chemical Co. IIand Controller BOISE CASCADE BUILDING MATERIALS DISTRIBUTION, Inc.) LENDERL.L.C., a Delaware limited liability company, as a Borrower By: /s/ Xxxxx Xxxxx Name: Xxxxx Xxxxx Title: Vice President and Controller BOISE CASCADE WOOD PRODUCTS, L.L.C., a Delaware limited liability company, as a Borrower By: /s/ Xxxxx Xxxxx Name: Xxxxx Xxxxx Title: Vice President and Controller XXXXX FARGO CAPITAL FINANCE, LLC, as Agent and as a Lender By: /s/ Xxxxxx Xxxxxxx Name: Xxxxxx Xxxxxxx Title: Senior Vice President BANK OF AMERICA, N.A., as a LenderLender By: /s/ Xxxxxxx X. Xxxxx Name: Xxxxxxx X. Xxxxx Title: Senior Vice President U.S. BANK NATIONAL ASSOCIATION, L/C Issuer and Swingline as a Lender By: /s/ Xxxx Xxxxxxxx Name: Xxxx Xxxx Xxxx Xxxxxxxx Title: Senior Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: CITIBANKJPMORGAN CHASE BANK, N.A., as a Lender and L/C Issuer By: /s/ Xxxxxxx Xxxxxx Name: Xxxxxxx Xxxxxx Title: Senior Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: BMO XXXXXX BANK N.A., as a Lender By:/s/ Xxxxx Xxxxxx Name: Xxxxx Xxxxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) LENDER: CAPITAL ONE, N.A., as a Lender By:/s/ Xxxxx X. Xxxxxx Name: Xxxxx X. Xxxxxx Title: Senior Vice President (Texas Oil & Chemical Co. IIExecutive Director PNC BANK, Inc.) LENDER: REGIONS BANKNATIONAL ASSOCIATION, as a Lender By: /s/ Xxxxxx Xxxxx X. Xxxxxx Name: Xxxxxx Xxxxx X. Xxxxxx Title: Assistant Vice President (Texas Oil & Chemical Co. IIAcknowledged and Agreed: BOISE CASCADE WOOD PRODUCTS HOLDINGS CORP., Inc.) DEPARTING LENDER: COMPASS BANKa Delaware corporation, as a Departing Lender Guarantor By: /s/ Xxxxxxx Xxxxxx Xxxxx Xxxxx Name: Xxxxxxx Xxxxxx Xxxxx Xxxxx Title: Vice President (Texas Oil & Chemical Co. II, Inc.) DEPARTING LENDER: SUNTRUST BANK, as a Departing Lender By: /s/ Xxxxxx Xxxx Name: Xxxxxx Xxxx Title: Director (Texas Oil & Chemical Co. II, Inc.) ANNEX A Amended and Restated Credit Agreement ANNEX A Published CUSIP Number: 00000XXX0 AMENDED AND RESTATED CREDIT AGREEMENT Dated as of October 1, 2014 as amended by the First Amendment, dated as of February 20, 2015, by the Second Amendment, dated as of March 28, 2017, and by the Third Amendment, dated as of Jul 25, 2017; and as further amended as of July 31, 2018 among TEXAS OIL & CHEMICAL CO. II, INC., as Borrower, CERTAIN SUBSIDIARIES OF THE BORROWER PARTY HERETO, as Guarantors, BANK OF AMERICA, N.A., as Administrative Agent, Swingline Lender and an L/C Issuer, and CITIBANK, N.A., as an L/C Issuer, and THE LENDERS PARTY HERETO XXXXXXX LYNCH, PIERCE, XXXXXX & XXXXX INCORPORATED, and CITIBANK, N.A. as SoleJoint Lead ArrangerArrangers and Sole BookrunnerJoint Bookrunners BMO XXXXXX BANK N.A., as Syndication Agent 4326171v8 TABLE OF CONTENTS Page ARTICLE I DEFINITIONS AND ACCOUNTING TERMS 16 1.01 Defined Terms 16 1.02 Other Interpretive Provisions 3539Controller