US1DOCS 7691267v3November 19, 2010 Response of Patterson-UTI Energy, Inc. toSeptember 9, 2010 Request of U.S. Environmental Protection AgencyNarrative ResponsesThese responses should be read in conjunction with those provided in the October 12, 2010 response of Patterson-UTI Energy, Inc.(“Patterson”).CBI? QuestionNumberResponse1, 1(f) Universal Well Services, Inc. (“UWS”) also purchased sulfamic acid from Clearwater Engineered Chemistry.Sulfamic acid is a component of Formulation/Mixture #1.3, 3(a),UWS is producing “Environmental Response Plan for Field Operations,” which governs UWS’s hydraulic fracturingoperations.EPA’s request seeks information about operations other than fracturing, including flowback (which occurs afterfracturing) and drilling (which occurs before fracturing). Patterson has inquiredof subsidiaries thatprovide flowbackand drilling services for responsive information and documents about their operations.Flowback. Eastern Reservoir Services (“ERS”), a businessdivision of UWS, providespost-fracturing flowbackservices. UWS and ERS compete independently; their respective fracturing and flowback services are not “bundled”for sale to well operators. Each has its own offices,employees, and recordkeeping systems. To Patterson’sknowledge, well operators rarely contract bothUWS and ERS to work on the same well.ERS customers typically control every aspect of the flowback operation, including the rate and pressure at which itoccurs, and the length of time ERS provides flowback beforegas is diverted to sales lines. Customers retainresponsibility for managing the fluidsflowed back from their wells. ERS does not provide standard operatingprocedures for managing flowback and produced waters.ERS typically does not need or request information onanticipated flowback volumes.It does not provide standard operating procedures for determining estimated volumesof flowback and produced waters.In an effort to assist EPA in understanding its flowback operations, ERS is producing its field operations handbook,known as “Standard 3.” Every ERS crewmember is trained on Standard 3, which describessafety procedures andrequirements for ERS operations at customer well sites.November 19, 2010 Response of Patterson-UTI Energy, Inc. to September 9, 2010 Request of U.S.Environmental Protection Agency2US1DOCS 7691267v3Instruction IDrilling. Although EPA’s request was limited to Patterson and affiliated entities “that perform hydraulic fracturingservices,” Patterson made a reasonableinquiry of its subsidiary Patterson-UTI Drilling Company LLC (“PattersonDrilling”), which provides drilling equipment and crew to well operators, but does not providehydraulic fracturingservices.In the last five (5) years,Patterson Drilling has worked exclusively on a“daywork” basis for well operators. Underthose drilling contracts, welloperators pay Patterson Drilling on a “per day”basis to furnish drilling equipment, andan experienced crew to maintain and operate that equipment, under the direction, supervision, and control of the welloperator and its consultants. The welloperator provides Patterson Drilling witha drilling program for its well, andwith any drilling fluids and additives called for by that program. Many well operators retain a “drilling mud”consultant, who gives daily (or more frequent) instructions to the PattersonDrilling crew on the amounts of additivesto use. Patterson Drilling is not responsible for calculations relating to, or choiceor composition of drillingfluids/muds.ERS and Patterson Drilling provide customers with operational equipment and an experienced crew for flowback anddrilling. Their procedures andtraining materials relate primarily to maintaining equipment and site safety, rather thanoperations. Well operators and/or theirthird party consultants may have information responsive to Questions 3 and3(a), because they retain responsibility for and otherwisecontrol flowback and drilling operations at their respectivewell sites.4(a)(ii),Instruction IPatterson’s hydraulic fracturing subsidiaries, UWS and Universal PressurePumping, Inc. (“UPP”) each trackfracturing jobs by well, not by “site,” as that term is defined by EPA, and track each well by county and state, and notby street address, city, orgeographic coordinates.UWS and UPP have identified the wells at which, and the customers for whom, they planned to perform hydraulicfracturing services as of November 12 and November15, respectively. See Response to Question 4(a)(ii)(attached),which contains confidential business information. Typically, well operator customers schedule jobs on an “as needed”basis, approximately two to four weeks in advance.Well operators may have more specific information on plans for future wells.4(b) UWS has identified the contractors it used during the period September9, 2009 to September 8, 2010, in connectionNovember 19, 2010 Response of Patterson-UTI Energy, Inc. to September 9, 2010 Request of U.S.Environmental Protection Agency3US1DOCS 7691267v3with its fracturing operations. See Response to Question 4(b)(attached),which contains confidential businessinformation. UWS may use those contractorsfor the fracturing jobs identifiedin response to Question 4(a)(ii).Instruction B UWSWilliam Stoner, Senior Vice PresidentMark Michaelis, ControllerGary Wells, Division Manager, UWSd/b/a Eastern Reservoir ServicesMichael Kloecker, Corporate Development ManagerPat Lander, EHS SpecialistRick Sloan, DistrictManager – AllenJoe Burchett, Sales Representative – AllenDerek Hina, Tech Manager / Sales Representative – AllenWilliam Ruddock, District Manager – BradfordTim Waugh, DistrictManager – BuckhannonRandy MacKinnon, District Manager – ConnellsvilleHoward Smith, Operations Manager – ConnellsvilleDavid Jeffers, Sales Representative – Lake CitySmokey Rowland, DistrictManager – Lake CityDean Rogers, District Manager – MeadvilleTom Larko, District Manager – PunxsutawneyChuck Cole, District Manager – WilliamsportRick Carter, District Manager – WoosterMatt Teichmer, Operations Manager – WoosterPatterson DrillingMichael Holcomb, Senior Vice President – OperationsUPPJohn Carnett, Vice PresidentCarlos Cruz, District Manager – North TexasJimmy Loven, District Manager – South TexasBobby Tubbs, District Manager – Midland