Revolving Commitments. Subject to the terms and conditions hereof and relying upon the representations and warranties herein set forth, each Revolving Lender agrees, severally and not jointly, to make Revolving Loans to the Borrower in Dollars from time to time during the Availability Period in an aggregate principal amount that will not result in # such Revolving Lender’s Revolving Exposure exceeding such Revolving Lender’s Revolving Commitment, or # the Total Revolving Outstandings exceeding the Collateral Pool Availability. Within the foregoing limits and subject to the terms and conditions set forth herein, the Borrower may borrow, prepay and reborrow Revolving Loans. Revolving Loans may be ABR Loans or LIBOR Loans, as further provided herein.

Subject to the terms and conditions set forth herein and in the Amendment and Restatement Agreement No. 1, each Rollover Initial Term Lender severally agrees to exchange its Exchanged Term Loans for a like principal amount of Initial Term Loans on the First Restatement Effective Date. Subject to the terms and conditions set forth herein and in the Amendment and Restatement Agreement No. 1, each Additional Refinancing Term Loan Lender severally agrees to make an Additional Initial Term Loan (which shall be considered an increase to (and part of) the Initial Term Loans) to the Borrowers pursuant to a single drawing on the First Restatement Effective Date in the principal amount equal to its Initial Term Loan Commitment on the First Restatement Effective Date. The Borrowers shall prepay the Non-Exchanged Term Loans with a like amount of the gross proceeds of the Additional Initial Term Loans and the Unsecured Notes, substantially concurrently with the receipt thereof. The Borrowers shall pay to the Rollover Lenders immediately prior to the effectiveness of the Amendment and Restatement Agreement No. 1 all accrued and unpaid interest on the Term B-1 Loans to, but not including, the First Restatement Effective Date on such First Restatement Effective Date. The Initial Term Loans shall have the terms set forth in this Agreement and the other Loan Documents, including as modified by the Amendment and Restatement Agreement No. 1, it being understood that the Initial Term Loans (and all principal, interest and other amounts in respect thereof) will constitute “Obligations” under this Agreement and the other Credit Documents. The Initial Term Loans # shall be denominated in U.S. Dollars, # shall be, except as hereinafter provided, at the option of the Lead Borrower, incurred and maintained as, and/or converted into, one or more Borrowings of Base Rate Term Loans or LIBO Rate Term Loans, provided that except as otherwise specifically provided in Section 2.10(b), all Initial Term Loans comprising the same Borrowing shall at all times be of the same Type and # shall be made by each such Lender in that aggregate principal amount which did not exceed the Initial Term Loan Commitment of such Lender on the First Restatement Effective Date (before giving effect to the termination thereof pursuant to [Section 4.02(a)(i)]). Once repaid, Initial Term Loans may not be reborrowed.

(i) On the Closing Date, certain Lenders made Initial Term Loans to the Borrowers, which Initial Term Loans # were incurred by the Borrowers pursuant to a single drawing on the Closing Date, # were denominated in U.S. Dollars, # were and shall be, except as hereinafter provided, at the option of the Lead Borrower, incurred and maintained as, and/or converted into, one or more Borrowings of Base Rate Term Loans or LIBO Rate Term Loans, provided that except as otherwise specifically provided in Section 2.10(b), all Initial Term Loans comprising the same Borrowing shall at all times be of the same Type and # were made by each such Lender in that aggregate principal amount which did not exceed the Initial Term Loan Commitment of such Lender on the Closing Date (before giving effect to the termination thereof pursuant to Section 4.02(a)(i)). Once repaid, Initial Term Loans may not be reborrowed.

. Subject to the terms and conditions hereof, each Dollar Term Lender severally agrees to make a term loan (a “Dollar Term Loan”) to the Borrower in Dollars in a single borrowing on the Funding Date in an amount not to exceed the amount of the Dollar Term Commitment of such Lender. The Dollar Term Loans may from time to time be Eurocurrency Loans or ABR Loans, as determined by the Borrower and notified to the Administrative Agent in accordance with Sections 2.2 and 2.12. The Dollar Term Lenders’ commitments to make the Dollar Term Loan shall expire on the earlier to occur of 5:00 P.M. on the Funding Date and ​, 2021 if the Funding Date has not occurred by such date. Amounts paid or prepaid in respect of Dollar Term Loans may not be reborrowed.

Subject to the terms and conditions hereof, each Revolving Lender severally agrees to make revolving credit loans (“Revolving Loans”) to the Borrower or any Subsidiary Borrower from time to time during the Revolving Commitment Period in an aggregate Dollar Equivalent principal amount at any one time outstanding which, when added to such Lender’s Revolving Percentage of the sum of # the L/C Obligations then outstanding and # the aggregate principal amount of the Swingline Loans then outstanding, does not exceed the amount of such Lender’s Revolving Commitment; provided that after giving effect to any such Revolving Loans, # the Total Revolving Extensions of Credit shall not exceed the Total Revolving Commitments and # the Total Revolving Extensions of Credit denominated in Alternative Currencies shall not exceed the Alternative Currency Sublimit. During the Revolving Commitment Period the Borrower may use the Revolving Commitments by borrowing, prepaying the Revolving Loans in whole or in part, and reborrowing, all in accordance with the terms and conditions hereof. The Revolving Loans may from time to time be Eurocurrency Loans or ABR Loans, as determined by the Borrower and notified to the Administrative Agent in accordance with Sections 2.5 and 2.12.

During the Revolving Commitment Period, subject to the terms and conditions hereof, including, without limitation delivery of an updated Borrowing Base

If for any reason the Total Revolving A Outstandings at any time exceed the Aggregate Revolving A Commitments then in effect, the Company shall immediately prepay Revolving A Loans and/or the Swing Line Loans and/or Cash Collateralize the L/C Obligations in an aggregate amount equal to such excess; provided, however, that the Company shall not be required to Cash Collateralize the L/C Obligations pursuant to this [Section 2.05(b)(i)] unless after the prepayment in full of the Revolving A Loans and the Swing Line Loans the Total Revolving A Outstandings exceed the Aggregate Revolving A Commitments then in effect;

Other Commitments. Except as otherwise agreed, it is further understood that Institute and the personnel performing the Research Collaboration may be or become involved in other activities and projects which entail commitments to other Third Parties (“Other Work”). The Principal Investigator and the personnel performing the Research Collaboration will use Commercially Reasonable Efforts to progress the Research Collaboration in accordance with terms of the Development Plan, including any timelines set forth therein. Institute and the personnel performing the Research Collaboration will each use their best efforts to avoid conflicts with the terms and obligations of this Agreement. The Principal Investigator will provide Atara with written notice as soon as practicable if he becomes aware of a conflict or potential conflict that may materially impose upon his ability to perform activities under the Development Plan and this Agreement. Nothing in this Agreement shall be construed to limit the freedom of Institute, or their researchers who are not participants in the Research Collaboration under this Agreement, from engaging in Other Work made under other agreements with other parties than Atara. Notwithstanding the foregoing, Institute and the Principal Investigator shall use all reasonable efforts to distinguish the research performed in connection with the Research Collaboration under this Agreement from all Other Work, and shall keep records pertaining to such Other Work separately from the records to be maintained pursuant to Article 8.

Revolving Commitments. If, at any time:

Producer Commitments. Subject to the terms and conditions of the Agreement, Producer has covenanted and committed # to exclusively use Fresh Water made available by [[AW:Organization]] to Producer under the Agreement for use in Producer’s hydraulic fracturing operations for all Wells operated by Producer on the Oil and Gas Interests now owned or hereafter acquired by Producer and located wholly or partly within the area described in Exhibit A hereto (the “Service Area”) or pooled, unitized or communitized with Oil and Gas Interests located wholly or partly within the Service Area (the “Service Area Properties”) and # to utilize [[AW:Organization]] for the performance of the Waste Water Services for all Produced Water produced from each Well operated by Producer on the Service Area Properties and attributable to either # Producer’s interest in such Well or # the interest of non-operating parties in such Well, to the extent that Producer (as operator) has the right to dispose of, and is responsible for the disposition of, such Produced Water, and for all Other Waste Water that is generated from Producer’s operations at Well Pads or that collects at the Well Pads or on Producer’s property adjacent to the Well Pads (the foregoing covenant and commitment being herein referred to as the “Commitment”). “Waste Water Services” includes gathering, collecting, trucking, treatment, recycling, sales for re-use, disposal, or other disposition.