Section Title

CBI Instruction

General Instructions

Survey Definitions

Hydraulic Fracturing Study Questions

Formulation/Mixture #1 Questions

U.S. EPA STUDY ON HYDRAULIC FRACTURING

Table of Contents
Tab Name

Instructions

Definitions

CBI

Study Questions

Formulation #1 Questions
Complete the questionnaire considering the following instructions:

When submitting maps, identify the scale of the map, the map title and an explanation of what the map d

features on the map, either label he feature at its location on the map or include in the map's legend the 

the feature.

● Submit any documents you relied on in preparing your response. Label each document submitted with 

subpart (if applicable) to which it corresponds. Date stamp each document you submit. If anything is dele

produced in response to this request, state the reason for and the subject matter of the deletion.

If a document you submit is responsive to more than one request, please provide one copy of the docum

requests, by number and subpart, to which it corresponds.

If you claim that an entire document responsive to this information request is a communication for which 

exists, identify the document and provide the basis for asserting the privilege. For any document for whic

exists for a portion of it, provide the portion of the document for which you are not asserting a privilege; id

document for which you are asserting the privilege; and provide the basis for such an assertion. Please n

assertion of any privilege, any facts contained in the document which are responsive to this information r

 in your response.

● Include the name, position, and title of each person(s) who provided information responsive to the req

● For all questions and sections, read all instructions and definitions carefully.

● Each question posed should be answered. Do not leave any entry blank. If the answer is zero, write “0

applicable, write “NA.” 

Hydraulic Fracturing

INSTRUCTIONS

● Your response is requested within 30 days of receipt of the questionnaire.

● If necessary, provide a separate narrative response to each question and/or clarify your responses in t
Instructions

map title and an explanation of what the map depicts. When identifying 

on the map or include in the map's legend the symbol used for identifying 

esponse. Label each document submitted with the request number and 

 each document you submit. If anything is deleted from a document 

equest, please provide one copy of the document and identify all the 

rmation request is a communication for which you assert that a privilege 

erting the privilege. For any document for which you assert that a privilege 

nt for which you are not asserting a privilege; identify the portion of the 

ovide the basis for such an assertion. Please note that regardless of the 

ment which are responsive to this information request should be disclosed

who provided information responsive to the request.

 any entry blank. If the answer is zero, write “0" or “zero”. If a question is not 

ach question and/or clarify your responses in the Comments page.
Term

"and" and "or"

"any"

Company

Concentration as 

Delivered

Concentration as 

Injected

Correspondence/ 

Communications

Describe

Terms include, but are not limited to, all oral, written, telephone, facsimi

and/or communications.

To detail, depict, or give an account of the requested information, or to r

written correspondence, communication, or conversation, or to report th

including the title, the author, the position or title of the author, the addre

addressee, indicated or blind copies, date, subject matter, number of pa

all persons to whom the document was distributed, shown, or explained

Refers to the actual concentration of the chemical as it is delivered to th

Refers to the actual concentration of the chemical as it is injected during 

mixing with source water.

Hydraulic Fracturing

Any and all

The entity identified as the addressee on the cover letter to this informa

affiliated corporate entities (including, but not limited to, parent corporat

partnerships, and affiliates) that perform hydraulic fracturing services.

Definition

DEFINITIONS

Please use the following definitions for purposes of responding to the questions in this questionnaire. E

terms in this information request have the same definition used in the CWA, 33 U.S.C. §§ 

through 6992k, and TSCA, 15 U.S.C. §§ 2601 through 2695d, and the regulations promulgated thereu

The terms shall be construed either disjunctively or conjunctively as nec

this information request any information which might otherwise be const
Document(s)

Facility

Flowback

Any information subject to any method of recording, storage, or transmi

information now or formerly in your possession, custody or control, or no

custody or control of any agent acting on your behalf. "Document" shall 

1. Writings of any kind, formal or informal, whether or not wholly or parti

printed form, including drafts, originals, and nonconforming copies that 

handwritten notes or comments, and including (by way of illustration and 

following:

a. invoices, receipts, endorsements, checks, bank drafts, canceled chec

orders;

b. letters, correspondences, faxes, telegrams, telexes, electronic comm

to, e-mails and other correspondence using computers or other electron

c. minutes, memoranda of meetings and telephone and other conversat

d. agreements, contracts, and the like;

e. log books, diaries, calendars, desk pads, journals;

f. bulletins, circulars, forms, pamphlets, statements;

g. reports, notice, analysis, notebook; 

h. graphs, charts; or

i. records, pamphlets, surveys, manuals, statistical compilations, picture

2. Microfilm or other film record, photograph, or sound recording on any 

3. Any tape, disc, or other type of memory generally associated with com

together with:

a. the programming instructions and other written material necessary to 

or other type of memory; and

b. printouts of such disc, disc pack, tape, or other type of memory.

4. Attachments to or enclosures with any document.

Land and all buildings, equipment structures, waste disposal units, pipe

and below the surface) and characteristics/features, which are located w

property or adjacent to the property owned or operated by the recipient 

The water mixture produced when the hydraulic fracturing procedure is 

and the direction of fluid flow reverses. The well is "cleaned up" by allow

flow up through the wellbore to the surface. Both the process and the re

to as "flowback" and the term is used in both ways herein.
Identify/ Provide the 

Identify Of

Kow 

Koc 

Kd 

KH 

Molar Mass

Person

Produced Water

Responsible Corporate 

Officer

Site

Waste/ Waste 

Streams/ Wastewater

Octanol-water partition coefficient, usually reported as a unitless numbe

Organic carbon-water partition coefficient, units L kg-1 

Distribution coefficient, units L kg-1

With respect to a person to set forth: (a) the person's full name, (b) pres

home addresses and telephone numbers; (c) present or last known emp

address), with job title, position or business; and (d) the person's social 

With respect to a corporation, partnership, business trust, government o

(including a sole proprietorship), to set forth: (a) its full name; (b) comple

(e.g., corporation, partnership); (d) the state under whose laws the entity 

description of its business.

With respect to a document, to provide (a) its customary business desc

date; (c) its number if any (e.g., invoice or purchase order number); (d) t

address, and the addressee(s) and/or recipient(s); (e) and a summary o

matter.

An individual, trust, firm, joint stock company, corporation (including a g

liability company, partnership, association, State, municipality, commiss

or an interstate body.

The water mixture produced when the drilling and fracturing of the well a

along with the natural gas. Some of this water is returned fracture fluid a

These produced waters move back through the wellhead with the gas.

Property where natural gas drilling and related activities occur, whether 

leased by the Company, including all areas within the exterior boundarie

may be located at a single site.

A president, secretary, treasurer, or vice-president of the corporation in 

function, or any other person who performs similar policy or decision-ma

Henry's Law Constant, acceptable units atm L mol-1 or bar L mol

mol-1 or PA m3 mol-1 

or Formula Weight units g mol-1 

By-products, residues, solid waste, hazardous waste, process wastewat

water, storm water runoff, and sanitary wastewater.

Definitions

t limited to, all oral, written, telephone, facsimile, and electronic correspondence 

n account of the requested information, or to report the content of any oral and/or 

ommunication, or conversation, or to report the contents of any document, 

hor, the position or title of the author, the addressee, the position or title of the 

ind copies, date, subject matter, number of pages, attachment or appendices, and 

ocument was distributed, shown, or explained.

entration of the chemical as it is delivered to the site, before dilution.

entration of the chemical as it is injected during the fracturing process following 

e addressee on the cover letter to this information request and all related and 

s (including, but not limited to, parent corporations, subsidiaries, joint ventures, 

s) that perform hydraulic fracturing services.

Definition

onding to the questions in this questionnaire. Except as otherwise defined below, 

§§ 1251 through 1387, RCRA, 42 U.S.C. §§ 6901 

695d, and the regulations promulgated thereunder.

ued either disjunctively or conjunctively as necessary to bring within the scope of 

ny information which might otherwise be construed to be outside its scope.
 any method of recording, storage, or transmittal, and shall include any 

ly in your possession, custody or control, or now or formerly in the possession, 

agent acting on your behalf. "Document" shall include, but not limited to:

rmal or informal, whether or not wholly or partially in handwriting, typed form, or 

afts, originals, and nonconforming copies that contain deletions, insertions, 

ments, and including (by way of illustration and not by way of limitation) any of the 

rsements, checks, bank drafts, canceled checks, deposit slips, withdrawal slips, 

es, faxes, telegrams, telexes, electronic communications including, but not limited 

espondence using computers or other electronic communication devices;

f meetings and telephone and other conversations, telephone messages;

veys, manuals, statistical compilations, pictures.

ecord, photograph, or sound recording on any type of device.

 type of memory generally associated with computers and data processing, 

ctions and other written material necessary to use such disc, disc pack, tape, 

disc pack, tape, or other type of memory.

uipment structures, waste disposal units, pipes, and other stationary items (above 

d characteristics/features, which are located within the exterior boundaries of the 

e property owned or operated by the recipient of this information request.

ed when the hydraulic fracturing procedure is completed and pressure is released, 

ow reverses. The well is "cleaned up" by allowing water and excess proppant to 

ore to the surface. Both the process and the returned water are commonly referred 
efficient, usually reported as a unitless number

o set forth: (a) the person's full name, (b) present or last known business and 

phone numbers; (c) present or last known employer (including the full name and 

sition or business; and (d) the person's social security number.

ion, partnership, business trust, government office or division, or other entity 

rship), to set forth: (a) its full name; (b) complete street address; (c) legal form 

ship); (d) the state under whose laws the entity was organized; and (e) a brief 

nt, to provide (a) its customary business description (e.g., letter, invoice); (b) its 

 (e.g., invoice or purchase order number); (d) the identity of the author(s), the

ee(s) and/or recipient(s); (e) and a summary of the substance or the subject 

oint stock company, corporation (including a government corporation), limited 

hip, association, State, municipality, commission, political subdivision of a State, 

ed when the drilling and fracturing of the well are complete, and water is produced

. Some of this water is returned fracture fluid and some is natural formation water. 

ove back through the wellhead with the gas.

s drilling and related activities occur, whether or not the property is owned or 

ncluding all areas within the exterior boundaries of that property. Multiple wells 

asurer, or vice-president of the corporation in charge of a principal business 

son who performs similar policy or decision-making functions for the corporation.

 or bar L mol-1 or Pa L mol-1 or atm m3 mol-1 or bar m3 

id waste, hazardous waste, process wastewater, waste slurry or sludge, cooling 

To facilitate claims of business confidentiality, we have provided Confidential Business 

Information (CBI) check boxes beside each request for which a claim of confidentiality may be 

made. You may claim as confidential all information included in the response to a request by 

checking the CBI box next to the request.

Hydraulic Fracturing

CONFIDENTIAL BUSINESS INFORMATION

Regulations governing the confidentiality of business information are contained in the Code of 

Federal Regulations (CFR) at Title 40 Part 2, Subpart B. Information covered by such a claim will 

be disclosed by EPA only by the procedures set forth in 40 CFR Part 2, Subpart B. If no 

confidentiality claim accompanies the information when EPA received it, the information may be 

made available to the public by EPA without further notice to you.

If you wish EPA to treat any information or response as "confidential," you must advise EPA and 

comply with the following procedures. Place on or attach to the information at the time it is 

submitted to EPA a cover sheet, stamped or typed legend, or other suitable form of notice 

employing such language as trade secret, proprietary, or company confidential

identify allegedly confidential portions of otherwise non-confidential documents and you may want 

to submit these separately to facilitate identification and handling by EPA. EPA will ask you to 

substantiate each claim of confidential business information by separate letter in accordance with 

applicable EPA regulations, 40 CFR Part 2, Subpart B.
CBI

provided Confidential Business 

which a claim of confidentiality may be 

uded in the response to a request by 

INFORMATION

ormation are contained in the Code of 

. Information covered by such a claim will 

 40 CFR Part 2, Subpart B. If no 

 EPA received it, the information may be 

 "confidential," you must advise EPA and 

h to the information at the time it is 

nd, or other suitable form of notice 

or company confidential . You must clearly 

confidential documents and you may want 

 handling by EPA. EPA will ask you to 

ation by separate letter in accordance with 
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

Street Address:City:State:Telephone Number: ext.Fax Number: Email: Convenient time to call between (Eastern Time): 8:00

5:00

1

Rob Kirsch, Esq. (Counsel for Patterson-UTI Energy, Inc.)Wilmer Cutler Pickering Hale and Dorr LLP60 State StreetBoston

02130

HYDRAULIC FRACTURING STUDY QUESTIONS

Hydraulic Fracturing

Company:To help us track your responses, please fill in the following identifying and contact information:

(617) 526-5000rob.kirsch@wilmerhale.com

to

Zip Code:

(617) 526-6779 None

Throughout the questionnaire, provide the general information requested. Please provide all free response answers in the yellow highlighted areas.

Provide the name of each hydraulic fracturing fluid formulation/mixture distributed or utilized by the Company within the past five years from the date of this letter. For each 

you to provide information for each constituent of such product. “Constituent” includes each and every component of the product, including chemical substances, pesticide

Your Name and Title:

MA

ampm

Formulation/Mixture #1Formulation/Mixture #2Formulation/Mixture #3Formulation/Mixture #4Formulation/Mixture #5Formulation/Mixture #6Formulation/Mixture #7Formulation/Mixture #8Formulation/Mixture #9Formulation/Mixture #10

2

Gelled Water for Cased Wells- Gas Present

Please provide the titles for all data and studies that your Company has in possession.

Gelled Water for Openhole Wells- Oil or GasGelled Water for Shallow Gas Wells with Nitrogen AssistCrosslinkAcid Breakdown

Provide all data and studies in the Company’s possession relating to the human health and environmental impacts and effects of all products and constituents identified in Q

Gelled Water for Cased Wells- Oil PresentSlickwater ShaleNitrogenFoam Acid Name of Hydraulic Fracturing Fluid

None.

Yes

No

MA

ampm
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

3a.

See November 19, 2010 Narrative ResponsesUniversal Well Services, Inc. Environmental Response Plan for Field Operations, October 10, 2008; see November 19, 2010 Narrative Responses

Modeling and actual choice of fracturing conditions such as pressures, temperatures, and fracturing material choices

Policies, Practices or Procedures, Including Standard Operating Practices 

(SOPs)

See October 12, 2010 Question 3 AddendumSee November 19, 2010 Narrative Responses

Procedures for managing flowback and produced watersProcedures to address unexpected circumstances such as loss of drilling fluid/mud, loss of circulation, spills, leaks or any emergency conditions (e.g., blow outs), less than fully effective well completionDetermination of estimated volumes of flowback and produced waters

Operation

Drilling in preparation for hydraulic fracturing including calculations or other indications for choice and composition of drilling fluids/mudsWater quality characteristics needed to prepare fracturing fluidRelationships among depth, pressure, temperature, formation geology, geophysics and chemistry and fracturing fluid composition and projected volume

See November 19, 2010 Narrative Responses

For all hydraulic fracturing operations for natural gas extraction involving any of the products and constituents identified in the response to Question 1, describe the process 

Please provide any policies, practices and procedures you employ, including any Standard Operating Procedures (SOPs) concerning hydraulic fracturing sites for all of the 

comment field.

See October 12, 2010 Question 3 Addendum

Determination of exact concentration of constituents in hydraulic fracturing 

See October 12, 2010 Question 3 AddendumSee October 12, 2010 Question 3 Addendum

Other, specify:Other, specify:Other, specify:Other, specify:Other, specify:Other, specify:Determination of dilution ratios for hydraulic fluidsDetermination of exact concentration of constituents in hydraulic fracturing fluid formulations/mixtures

See October 12, 2010 Question 3 AddendumSee October 12, 2010 Question 3 Addendum
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

CBI? 3b.

4ai.

Site Identifier CBI? CBI? City CBI? Sta

Describe how fracturing fluid products and constituents are modified at a site during the fluid injection process.Locations of Sites Where Service Was Provided Within the Last YearIdentify all sites where, and all persons to whom, the Company provided hydraulic fracturing fluid services that involve the use of hydraulic fracturing fluids for the year prior 

identifier for each site where hydraulic fracturing fluids were used. Describe the specific hydraulic fracturing fluid services provided for each of the sites, including the identit

of such services.

Service Performed

See October 12, 2010 Question 4 List

Beyond physical modifications resulting from mixing and diluting with water, the only modification made to the fracturing fluid products listed in response to Question 1 is a c

salt (NH4HF2) to produce an aqueous mixture of hydrochloric acid and hydrofluoric acid (HF). The concentration of the resulting solution is typically 12% HCl and 3% HF. 

Street Address

SelectSelectSelectSelectSelect

Yes

YesYesYesYesYes

YesYesYesYesYes

YesYesYesYesYes

Site Identifier CBI? CBI? 

0000

Contact Name Address

Contact Information for Persons for Whom Service Was Provided Within the Last Year

See October 12, 2010 Question 4 List

SelectSelectSelectSelectSelectSelectSelectSelectSelectSelect

Yes

YesYesYesYesYesYesYesYesYes

Yes

YesYesYesYesYesYesYesYesYes

Yes

YesYesYesYesYesYesYesYesYes

Yes

YesYesYesYes

YesYesYesYes

SelectSelectSelectSelectSelectSelectSelectSelectSelectSelect

Yes

YesYesYesYesYesYesYesYesYes

Yes

YesYesYesYesYesYesYesYesYes

Yes

YesYesYesYesYesYesYesYesYes

Yes

YesYesYesYes

YesYesYesYes
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

000000

Site Identifier CBI? CBI? 

0000Contact Information for Persons Hired for Hydraulic Fracturing Within the Last Year

Contact Name Service Performed 

See November 19, 2010 Response to Question 4(b) 

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYes

YesYesYesYes

000000

4aii.

Site Identifier CBI? CBI? City CBI? Sta

Street Address 

See November 19, 2010 Response to 

Question 4(a)(ii)

Service to be Performed

Locations of Sites Where Service Will Be Provided Within the Next 12 MonthsIdentify all sites where, and all persons to whom, the Company plans to provide hydraulic fracturing fluid services that involve the use of hydraulic fracturing fluids during on

unique identifier for each site where hydraulic fracturing fluids were used. Describe the specific hydraulic fracturing fluid services to be provided for each of the sites, includany portion of such services.

Select

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYes

Yes Yes Yes 

Question 4(a)(ii)

Select

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYes

Yes Yes Yes 
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

SelectSelectSelectSelectSelectSelectSelectSelectSelect

YesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYes

Site Identifier CBI? CBI? 

00000000

Address

Contact Information for Persons for Whom Service Will Be Provided Within the Next 12 Months

Contact Name 

See November 19, 2010 Response to Question 4(a)(ii)

SelectSelectSelectSelectSelectSelectSelectSelectSelect

YesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYes

SelectSelectSelectSelectSelectSelectSelectSelectSelect

YesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYes
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

00

Site Identifier CBI? CBI? 

000000

0Contact Information for Persons Hired for Hydraulic Fracturing Within the Next 12 Months

Contact Name Service to be Performed 

See November 19, 2010 Narrative Responses

YesYes

YesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

0000

YesYes

YesYes

YesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYes
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

Gelled Water for Cased Wells- Gas Present

Formulation/ Mixture 

Name

Chemical Name (Use 

IUPAC 

Nomenclature)

CBI? Chemical Formula CBI? Chemical Abstract System (CAS) Number CBI? Purpose of Chemical in Hydraulic Fracturing Fluid Formulation/Mixture CBI? Concentration as Delivered to Site (please indicate units) CBI? How was the Concentration Determined? CB

Gelled Water for Cased Wells- Gas Present SuperSurf methanol 67-56-1 30-60% 

Gelled Water for Cased Wells- Gas Present Cla-Chek LP ethylene glycol 107-21-1 30-60% 

Gelled Water for Cased Wells- Gas Present Unigel 19XL guar gum None Available > 95% 

Gelled Water for Cased Wells- Gas Present Unigel 5F guar gum None Available > 95% 

Gelled Water for Cased Wells- Gas Present Unigel 2XL guar gum None Available > 95% 

Gelled Water for Cased 

Hydraulic Fracturing 

FORMULATION / MIXTURE SPECIFIC QUESTIONS

Please provide information on all constituents in the formulation/mixture. If Material Safety Data Sheets (MSDSs) are available, please attach them to your submittal. Formulation/Mixture Name:Table 1. Chemical Constituents

CalculatedCalculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

SurfactantClay controlGelling agentGelling agentGelling agentGelling agent

Analytically

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYes

YeYeYeYeYeYe

Gelled Water for Cased Wells- Gas Present Unigel 1XLR hydroxypropyl guar 39421-75-5 > 95% 

Gelled Water for Cased Wells- Gas Present LEB-10X ethylene glycol 107-21-1 30-60% 

Gelled Water for Cased Wells- Gas Present Iron Sta IIC ethylene glycol 107-21-1 10-30% 

Gelled Water for Cased Wells- Gas Present Flomax 50 (CESI) isopropanol, citrus terpenes 67-63-0, 94266-47-4 1-15%, 1-15% 

Gelled Water for Cased Wells- Gas Present

Flomax 50 (Clearwater)

alcohol ethoxylated (C8 C10 4.5 mol), isopropyl alcohol, ethylene glycol

68439-45-2, 67-63-0, 107-21-1 10-30%, 10-30%, 7-13% 

Gelled Water for Cased Wells- Gas Present AP Breaker ammonium persulfate 7727-54-0 60-100% 

Gelled Water for Cased Wells- Gas Present EHT Breaker

ammonium persulfate, cured acrylic resin, silica crystalline quartz

7727-54-0, None Available, 14808-60-7 >75%, >16%, <10% 

Gelled Water for Cased Wells- Gas Present ALPHA 3385

(solvent naptha, petroleum aromatic), (poly(oxy-1,ethanediyl),a-

(nonylphenol)-w-hydroxy64742-94-5, 51811-79-1, 91-20-3 Sand Control 65-100%, 30-60%, 3-7% 

Gelled Water for Cased Wells- Gas Present Uniflo isopropyl alcohol 67-63-0 40-70% 

Gelled Water for Cased 

Wells- Gas Present Unislik 30 (kemira)

petroleum distillate hydrotreated light, 

alcohols (C10-16)-

64742-47-8, 68002-97-1, 68439-50-9, 68551-12-2

10-30%, ~2.0-3.5%, 2.0-3.5%, ~2.0-3.5% 

CalculatedCalculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

SurfactantClay controlGelling agentGelling agentGelling agentGelling agentBreaker fluid

Analytically

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YeYeYeYeYeYeYe

CalculatedCalculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Iron controlSurfactantBreaker fluidBreaker fluidOther, specify:SurfactantFriction reducer

Analytically

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YeYeYeYeYeYeYe

Calculated

Analytically

Surfactant

Yes Yes Yes Yes Yes Ye

Wells- Gas Present alcohols (C10-16)-

ethoxylated, C12-C14 

68439-50-9, 68551-12-2 3.5%, ~2.0-3.5%

CalculatedCalculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

SurfactantClay controlGelling agentGelling agentGelling agentGelling agentBreaker fluid

Analytically

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YeYeYeYeYeYeYe

CalculatedCalculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Iron controlSurfactantBreaker fluidBreaker fluidOther, specify:SurfactantFriction reducer

Analytically

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YeYeYeYeYeYeYe

Calculated

Analytically

Surfactant

Yes Yes Yes Yes Yes Ye
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

Gelled Water for Cased Wells- Gas Present Unislik 30 (champion) hydrotreated light distillates 64742-47-8 None Available 

Gelled Water for Cased Wells- Gas Present BioClear 1000 2,2-dibromo-3- nitrilopropionamide 10222-01-2 97.6% 

Gelled Water for Cased Wells- Gas Present Unibac isopropyl alcohol, methanol 67-63-0, 67-56-1 30-60%, 10-30% 

Gelled Water for Cased Wells- Gas Present EC6116A

dibromoacetonitrile, 2,2-dibromo-3-nitrilopropionamide, 

polyethylene glycol

3252-43-5, 10222-01-2, 25322-68-3 1-5%, 10-30%, 30-60% 

Gelled Water for Cased Wells- Gas Present HEX Activator

alcohols,C12-14-secondary-ethoxylated, Alcohols, C12-14-

secondary

84133-50-6, 126950-60-5 70-100%, 1-5% 

Gelled Water for Cased Wells- Gas Present Resin Coated Sand

phenol-formaldehyde resin, formaldehyde, hexamethylenetetramine

, iron oxide (fume), 

9003-35-4, 50-00-0, 1009-7-0, 1309-37-1, 1332-58-7, 108-95-2, 14808-60-7

1-6%, <0.01%, <1%,<15%, <5%, <0.01%, Balance

Gelled Water for Cased Wells- Gas Present API Frac Sand

crystalline silica (quartz), aluminum oxide, iron oxide, titanium oxide

14808-60-7, 1344-28-1, 1309-37-1, 13463-67-7

99.0-99.9%, <0.8%, <0.1%, <0.1% 

Gelled Water for Cased Wells- Gas Present Activator BXL-A proprietary ingredient None Available 40-70% 

Gelled Water for Cased Wells- Gas Present GBL-8X None Available None Available None Available 

Gelled Water for Cased 

Wells- Gas Present Sulfamic Acid sulfamic acid 5329-14-6 100% 

CalculatedCalculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

BiocideBiocideBiocide

Activator

ProppantProppant

Activator

Analytically

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YeYeYeYeYeYeYe

Calculated

Analytically

Breaker fluid

Yes Yes Yes Yes Yes Ye

Calculated

Analytically

pH control

Yes Yes Yes Yes Yes Ye

Calculated

Analytically

Friction reducer

Yes Yes Yes Yes Yes Ye

Wells- Gas Present Sulfamic Acid sulfamic acid 5329-14-6 100% Gelled Water Fracs for Cased Wells- Gas Present

Potassium Chloride Potassium Chloride 7447-40-7 100% 

Formulation/Mixture 

Name Chemical Name CBI? 

Gelled Water for Cased Wells- Gas Present

SuperSurf 

Gelled Water for Cased Wells- Gas Present

Cla-Chek LP 

Gelled Water for Cased Wells- Gas Present

Unigel 19XL 

Gelled Water for Cased Wells- Gas Present

Unigel 5F 

Gelled Water for Cased Wells- Gas Present

Unigel 2XL 

Gelled Water for Cased Wells- Gas Present

Unigel 1XLR 

Gelled Water for Cased Wells- Gas Present

LEB-10X 

Gelled Water for Cased Iron Sta IIC 

None AvailableNone AvailableNone Available

None Available

None Available

Molar Mass 

(g mol-1) 

None AvailableNone AvailableNone Available

None Available None Available

Organic Carbon-Water Partition 

Coefficient KOC 

(L kg-1)

None AvailableNone Available

Octanol- Water Partition 

Coefficient Kow

None AvailableNone AvailableNone Available None Available

Table 2. Chemical and Physical Properties of Chemical Constituents Please provide the chemical and physical properties of the chemical constituents listed in Table 1 above.

KH (acceptable units atm L mol1 or bar L mol-1 or Pa L mol-1 or 

atm m3 mol-1 or bar m3 mol-1 or 

Pa m3 mol-1) 

None Available

Distribution Coefficient Kd 

(L kg-1)

None AvailableNone Available

None AvailableNone AvailableNone AvailableNone Available

None Available None AvailableNone AvailableNone AvailableNone AvailableNone AvailableNone Available

None Available

None Available

None Available None Available 

None AvailableNone AvailableNone Available

None AvailableNone AvailableNone Available 

YesYesYesYesYesYesYesYes

CalculatedCalculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

BiocideBiocideBiocide

Activator

ProppantProppant

Activator

Analytically

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YeYeYeYeYeYeYe

Calculated

Analytically

Breaker fluid

Yes Yes Yes Yes Yes Ye

Calculated

Analytically

pH control

Yes Yes Yes Yes Yes Ye

Calculated

Analytically

Friction reducer

Yes Yes Yes Yes Yes Ye

Calculated

Analytically

Yes Yes Yes Yes Yes Ye

Gelled Water for Cased Wells- Gas Present

YesYesYesYesYesYesYesYes

CalculatedCalculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

BiocideBiocideBiocide

Activator

ProppantProppant

Activator

Analytically

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YeYeYeYeYeYeYe

Calculated

Analytically

Breaker fluid

Yes Yes Yes Yes Yes Ye

Calculated

Analytically

pH control

Yes Yes Yes Yes Yes Ye

Calculated

Analytically

Friction reducer

Yes Yes Yes Yes Yes Ye

Calculated

Analytically

Yes Yes Yes Yes Yes Ye
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

Gelled Water for Cased Wells- Gas Present

Flomax 50 (CESI) 

Gelled Water for Cased Wells- Gas Present

Flomax 50 (Clearwater)

Gelled Water for Cased Wells- Gas Present

AP Breaker 

Gelled Water for Cased Wells- Gas Present

EHT Breaker 

Gelled Water for Cased Wells- Gas Present

ALPHA 3385 

Gelled Water for Cased Wells- Gas Present

Uniflo 

Gelled Water for Cased Wells- Gas Present

Unislik 30 (kemira) 

Gelled Water for Cased Wells- Gas Present

Unislik 30 (champion) 

Gelled Water for Cased Wells- Gas Present

BioClear 1000 

Gelled Water for Cased Wells- Gas Present

Unibac 

Gelled Water for Cased Wells- Gas Present

EC6116A 

Gelled Water for Cased Wells- Gas Present

HEX Activator 

Gelled Water for Cased Wells- Gas Present

Resin Coated Sand 

Gelled Water for Cased API Frac Sand 

None Available

None Available None Available None Available None Available None Available None AvailableNone Available None Available

None Available None Available 

None Available None AvailableNone Available

None Available None Available None Available None Available

None Available 

None Available None AvailableNone Available None Available None Available

None Available None Available 

None Available None AvailableNone Available None Available None Available None AvailableNone Available None Available None Available None Available

None Available None Available None Available 

None Available None Available

None Available 

None Available None AvailableNone Available None Available None Available None Available

None Available

None Available None AvailableNone Available None Available

None Available None Available None AvailableNone Available None Available None AvailableNone Available None Available

None Available None AvailableNone Available None Available

None Available 

None Available None Available

None AvailableNone Available 

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

Gelled Water for Cased Wells- Gas Present

API Frac Sand 

Gelled Water for Cased Wells- Gas Present

Activator BXL-A 

Gelled Water for Cased Wells- Gas Present

GBL-8X 

Gelled Water for Cased Wells- Gas Present

Sulfamic Acid 

Gelled Water Fracs for Cased Wells- Gas 

Present

Potassium Chloride 

Formulation/Mixture 

Name Proppant Name CBI? Proppant Specifications CBI? Is the Proppant Resin Coated? CBI? Specify the Resin Coating Materials Used CBI?

Gelled Water for Cased Wells- Gas Present API Frac Sand 10/20 down to 70/140 mesh Not Applicable

Gelled Water for Cased Wells- Gas Present Resin Coated Sand 16/30, 20/40, 30/50, 40/70 mesh phenol-formaldehyde resin, formaldehyde, hexamethylenetetramine, iron 

oxide (fume), hydrated Gelled Water for Cased 

Wells- Gas PresentGelled Water for Cased Wells- Gas PresentGelled Water for Cased Wells- Gas PresentGelled Water for Cased Wells- Gas Present

None Available None Available None Available None Available None Available None Available

None Available

None Available None Available None Available

None Available

Table 3. Proppant Constituents Please provide the chemical and physical properties of the proppants listed in Table 1 above.

None Available 74.55

97.1

None Available None Available None Available None AvailableNone Available

None Available None Available None Available None Available

None Available None Available 

YesYes

No

Yes

No

Yes

No

Yes

No

Yes

NoNo

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYesYesYesYesYes

Wells- Gas Present

YesYes

No

Yes

No

Yes

No

Yes

No

Yes

NoNo

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYesYesYesYesYes
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

Gelled Water for Cased Wells- Gas Present

Yes

No

Yes Yes Yes Yes
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

Gelled Water for Cased Wells- Gas Present SuperSurf See October 12, 2010 Narrative Responses 0.5 to 1 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engineered Chemistry 

Gelled Water for Cased 

Wells- Gas Present Cla-Chek LP See October 12, 2010 Narrative Responses 0.5 to 1 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engineered Chemistry 

Gelled Water for Cased 

Wells- Gas Present Unigel 19XL See October 12, 2010 Narrative Responses 7 to 20 lb/1000 gal See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Hercules Incorporated 

Gelled Water for Cased Wells- Gas Present Unigel 5F See October 12, 2010 Narrative Responses 7 to 20 lb/1000 gal See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Hercules Incorporated 

Gelled Water for Cased Wells- Gas Present Unigel 2XL See October 12, 2010 Narrative Responses 7 to 20 lb/1000 gal See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Hercules Incorporated 

Gelled Water for Cased 

Wells- Gas Present Unigel 1XLR See October 12, 2010 Narrative Responses 7 to 20 lb/1000 gal See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Hercules Incorporated 

Gelled Water for Cased Wells- Gas Present LEB-10X See October 12, 2010 Narrative Responses 0.05 to 0.2 qt/1000 gal See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engineered Chemistry 

Gelled Water for Cased Wells- Gas Present Iron Sta IIC See October 12, 2010 Narrative Responses 0.5 to 1 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engineered Chemistry 

Gelled Water for Cased 

Wells- Gas Present Flomax 50 (CESI) See October 12, 2010 Narrative Responses 2 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses CESI Chemical 

Gelled Water for Cased 

Wells- Gas Present

Flomax 50 (Clearwater)

See October 12, 2010 Narrative Responses

2 gpt See October 12, 2010 

Narrative Responses

See October 12, 2010 Narrative Responses

Clearwater Engineered Chemistry 

Gelled Water for Cased Wells- Gas Present AP Breaker See October 12, 2010 Narrative Responses 1 to 5 lb/1000 gal See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engineered Chemistry 

Gelled Water for Cased Wells- Gas Present EHT Breaker See October 12, 2010 Narrative Responses 1 to 3 lb/1000 gal See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Fritz Industries Inc 

CBI?

Quantity of 

Constituent used in 

Hydraulic Fracturing 

(please specify units)

Concentration of 

Constituent as Injected 

(please indicate units)

CBI? CB

Specifications to Meet Site 

Requirements

Rationale for Site 

Requirements

Manufacturer of 

Product and/or 

Constituents

CBI? Formulation/Mixture Name Constituent

Table 4. Formulation/Mixture Specifications

CBI? CBI?

YesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYes

YeYeYeYeYeYeYeYeYeYeYe

Yes Yes Yes Yes Yes Ye

Wells- Gas Present Narrative Responses Narrative Responses Narrative ResponsesGelled Water for Cased Wells- Gas Present ALPHA 3385 See October 12, 2010 Narrative Responses 1.5 gal/1000 lb of proppant See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engineered Chemistry 

Gelled Water for Cased Wells- Gas Present Uniflo See October 12, 2010 Narrative Responses 0.5 to 1 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engineered Chemistry 

Gelled Water for Cased Wells- Gas Present Unislik 30 (kemira) See October 12, 2010 Narrative Responses 0.5 to 1 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Kemira Water Solutions Inc 

Gelled Water for Cased Wells- Gas Present Unislik 30 (champion) See October 12, 2010 Narrative Responses 0.5 to 1 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Champion Technologies 

Gelled Water for Cased 

Wells- Gas Present BioClear 1000 See October 12, 2010 Narrative Responses 2 lb/500 bbl See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engineered Chemistry 

Gelled Water for Cased Wells- Gas Present Unibac See October 12, 2010 Narrative Responses 1 to 2 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engineered Chemistry 

Gelled Water for Cased Wells- Gas Present EC6116A See October 12, 2010 Narrative Responses 0.1 to 0.5 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Nalco 

Gelled Water for Cased Wells- Gas Present HEX Activator See October 12, 2010 Narrative Responses 10 to 20 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Hexion 

Gelled Water for Cased Wells- Gas Present Resin Coated Sand See October 12, 2010 Narrative Responses 1 to 5 lb/gal See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Santrol, Inc 

Gelled Water for Cased Wells- Gas Present API Frac Sand See October 12, 2010 Narrative Responses 0.25 to 5 lb/gal See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Various 

Gelled Water for Cased Wells- Gas Present Activator BXL-A See October 12, 2010 Narrative Responses 1 to 2 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engineered Chemistry 

Gelled Water for Cased Wells- Gas Present GBL-8X See October 12, 2010 Narrative Responses 0.05 to 0.2 qt/1000 gal See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses CESI Chemical 

Gelled Water for Cased Wells- Gas Present Sulfamic Acid See October 12, 2010 Narrative Responses 0.5 to 5 lb per 1000 gal See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Sagar Enterprises; see November 19, 2010 Narrative Responses 

Gelled Water Fracs for Cased Wells- Gas 

Present

Potassium Chloride See October 12, 2010 Narrative Responses 0.17 to 0.34 lb/gal See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Various 

Table 5. Formulation/Mixture/Water Specifications

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YeYeYeYeYeYeYeYeYeYeYeYeYeYe

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YeYeYeYeYeYe

Yes Yes Yes Yes Yes YeYes Yes Yes Yes Yes YeYes Yes Yes Yes Yes YeYes Yes Yes Yes Yes YeYes Yes Yes Yes Yes YeYes Yes Yes Yes Yes Ye

Table 5. Formulation/Mixture/Water Specifications

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YeYeYeYeYeYeYeYeYeYeYeYeYeYe

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YeYeYeYeYeYe

Yes Yes Yes Yes Yes YeYes Yes Yes Yes Yes YeYes Yes Yes Yes Yes YeYes Yes Yes Yes Yes YeYes Yes Yes Yes Yes YeYes Yes Yes Yes Yes Ye
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

High Volume CB

Gelled Water for Cased Wells- Gas Present

Refer to response provided under "Range of Total Fluid Injected."

See October 12, 2010 Narrative Responses

See October 12, 2010 Narrative Responses

15,000 to 120,000 gal per stage; 1 to 6 stages per well

See October 12, 2010 Narrative Responses

See October 12, 2010 Question 3 Addendum

CBI?

Geological Factors Associate

CBI? CBI? CBI? CBI? Formulation/Mixture Name Quantity of Water Used (gallons) Incoming Water Source Quality of Water Range of Total Fluid Injected (Low to High) (gallons) Average Volume of Total Fluid Injected (gallons)

Yes Yes Yes Yes Yes Ye
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

Gelled Water for Cased Wells- Oil Present

Formulation/ Mixture 

Name

Chemical Name (Use 

IUPAC 

Nomenclature)

CBI? Chemical Formula CBI? Chemical Abstract System (CAS) Number CBI? Purpose of Chemical in Hydraulic Fracturing Fluid Formulation/Mixture CBI? Concentration as Delivered to Site (please indicate units) CBI? How was t

Concentrat

Determine

Gelled Water for Cased Wells- Oil Present SuperSurf methanol 67-56-1 30-60% 

Gelled Water for Cased Wells- Oil Present Cla-Chek LP ethylene glycol 107-21-1 30-60% 

Gelled Water for Cased Wells- Oil Present Unigel 19XL guar gum None Available > 95% 

Gelled Water for Cased Wells- Oil Present Unigel 5F guar gum None Available > 95% 

Gelled Water for Cased 

Wells- Oil Present Unigel 2XL guar gum None Available > 95% 

Hydraulic Fracturing 

FORMULATION / MIXTURE SPECIFIC QUESTIONS

Please provide information on all constituents in the formulation/mixture. If Material Safety Data Sheets (MSDSs) are available, please attach them to your submittal. Table 1. Chemical ConstituentsFormulation/Mixture Name:

CalculatedCalculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

SurfactantClay controlGelling agentGelling agentGelling agent

Analytically

YesYesYesYesYes

YesYesYesYesYes

YesYesYesYesYes

YesYesYesYesYes

YesYesYesYesYes

YesYesYesYesYes

Wells- Oil Present Unigel 2XL guar gum None Available > 95% Gelled Water for Cased Wells- Oil Present Unigel 1XLR hydroxypropyl guar 39421-75-5 > 95% 

Gelled Water for Cased Wells- Oil Present LEB-10X ethylene glycol 107-21-1 30-60% 

Gelled Water for Cased Wells- Oil Present GBL-8X None Available None Available None Available 

Gelled Water for Cased Wells- Oil Present Iron Sta IIC ethylene glycol 107-21-1 10-30% 

Gelled Water for Cased Wells- Oil Present NDL-100

toluene, xylene, isopropyl alcohol, ethylbenzene

108-88-3, 1330-20-7, 67-63-0, 100-41-4 Fluid Leakoff Control

30-60%, 30-60%, 15-40%, 10-30% 

Gelled Water for Cased Wells- Oil Present Flomax 50 (CESI) isopropanol, citrus terpenes 67-63-0, 94266-47-4 1-15%, 1-15% 

Gelled Water for Cased Wells- Oil Present

Flomax 50 (Clearwater)

alcohol ethoxylated (C8 C10 4.5 mol), isopropyl alcohol, ethylene glycol

68439-45-2, 67-63-0, 107-21-1 10-30%, 10-30%, 7-13% 

Gelled Water for Cased Wells- Oil Present ALPHA 3385

(solvent naptha, petroleum aromatic), 

(poly(oxy-1,ethanediyl),a-(nonylphenol)-w-hydroxy64742-94-5, 51811-79-1, 91-20-3 Sand Control 65-100%, 30-60%, 3-7% 

CalculatedCalculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

SurfactantClay controlGelling agentGelling agentGelling agentGelling agentBreaker fluid

Analytically

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

CalculatedCalculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Breaker fluidIron controlOther, specify:SurfactantOther, specify:

Analytically

YesYesYesYesYes

YesYesYesYesYes

YesYesYesYesYes

YesYesYesYesYes

YesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYes

Calculated

Analytically

Surfactant

Yes Yes Yes Yes Yes 
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

Gelled Water for Cased Wells- Oil Present NE-50 isopropyl alcohol, methanol 67-63-0, 67-56-1

Non-emulsifier

30-60%, 10-30% 

Gelled Water for Cased Wells- Oil Present NE-70 methanol, naphthalene, 2-ethylhexanol 67-56-1, 91-20-3, 104-76-7 Non-emulsifier 5-10%, 3-7%, 3-7% 

Gelled Water for Cased Wells- Oil Present NE-90

methanol, heavy aromatic naphtha, polyethylene glycol, 

isopropanol, (EO-C7-9-

67-56-1, 64742-94-5, 25322-68-3, 67-63-0, 78330-19-5, 78330-20-8, 104-76-7, 91-20-3 Non-emulsifier

30-60%, 1-5%, 1-5%, 5-10%, 1-5%, 1-5%, 5-10%, 0.1-1%

Gelled Water for Cased Wells- Oil Present Uniflo isopropyl alcohol 67-63-0 40-70% 

Gelled Water for Cased Wells- Oil Present Unislik 30 (kemira)

petroleum distillate hydrotreated light, alcohols (C10-16)-

ethoxylated, C12-C14 

64742-47-8, 68002-97-1, 68439-50-9, 68551-12-2

10-30%, ~2.0-3.5%, 2.0-3.5%, ~2.0-3.5% 

Gelled Water for Cased Wells- Oil Present Unislik 30 (champion) hydrotreated light distillates 64742-47-8 None Available 

Gelled Water for Cased Wells- Oil Present BioClear 1000 2,2-dibromo-3- nitrilopropionamide 10222-01-2 97.6% 

Gelled Water for Cased Wells- Oil Present Unibac isopropyl alcohol, methanol 67-63-0, 67-56-1 30-60%, 10-30% 

Gelled Water for Cased Wells- Oil Present EC6116A

dibromoacetonitrile, 2,2-dibromo-3-

nitrilopropionamide, 

3252-43-5, 10222-01-2, 25322-68-3 1-5%, 10-30%, 30-60% 

Calculated

Analytically

Calculated

Analytically

Other, specify:Other, specify:

YesYes

YesYes

YesYes

YesYes

YesYes

CalculatedCalculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Other, specify:SurfactantFriction reducerBiocideBiocideBiocide

Analytically

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYes

Calculated

Analytically

Friction reducer

Yes Yes Yes Yes Yes 

Wells- Oil Present nitrilopropionamide, 

polyethylene glycol

25322-68-3

Gelled Water for Cased Wells- Oil Present ParaSurf toluene, xylene, ethylbenzene 108-88-3, 1330-20-7, 100- 41-4 40-70%, 30-60%, 15- 40% 

Gelled Water for Cased Wells- Oil Present Paranox

glycol ethers, toluene, xylene, 2-ethylhexanol, ethylbenzene

111-76-2, 108-88-3, 1330-20-7, 104-76-7, 100-41-4

paraffin crystal modifier

5-10%, 40-70%, 30-60%, 3-7%, 15-40% 

Gelled Water for Cased Wells- Oil Present Parasol II ethylbenzene, solvent naphtha, toluene, xylene 100-41-4, 64742-88-7, 108- 88-3, 1330-20-7 7-13%, 40-70%, 30- 60%, 15-40% 

Gelled Water for Cased Wells- Oil Present

Mutual Solvent (MS10) EB-Butyl Cellosolve 111-76-2 > 60% 

Gelled Water for Cased Wells- Oil Present HEX Activator

alcohols,C12-14-secondary-ethoxylated, Alcohols, C12-14-secondary

84133-50-6, 126950-60-5 70-100%, 1-5% 

Gelled Water for Cased Wells- Oil Present Resin Coated Sand

phenol-formaldehyde resin, formaldehyde, hexamethylenetetramine

, iron oxide (fume), 

9003-35-4, 50-00-0, 1009-7-0, 1309-37-1, 1332-58-7, 108-95-2, 14808-60-7

1-6%, <0.01%, <1%,<15%, <5%, <0.01%, Balance

Gelled Water for Cased Wells- Oil Present API Frac Sand

crystalline silica (quartz), aluminum oxide, iron oxide, titanium oxide

14808-60-7, 1344-28-1, 1309-37-1, 13463-67-7

99.0-99.9%, <0.8%, <0.1%, <0.1% 

Gelled Water for Cased Wells- Oil Present Parahib 2000

xylene, ethylbenzene, light aromatic naphtha, 

1,2,4- Trimethylbenzene, 1,3,5- trimethylbenzene

1330-20-7, 100-41-4, 64742-95-6, 95-63-6, 108-67-8 paraffin inhibitor

30-60%, 5-10%, 1-5%, 1-5%, 0.1-1% 

Gelled Water for Cased 

Wells- Oil Present UAD 100 Ethoxylated fatty acid ester, alkylaryl sulfonate trade secret, trade secret None Available, None Available 

Calculated

Analytically

Calculated

Analytically

Other, specify:Other, specify:

YesYes

YesYes

YesYes

YesYes

YesYes

CalculatedCalculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Other, specify:SurfactantFriction reducerBiocideBiocideBiocideSurfactant

Analytically

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

Calculated

Other, specify:

Analytically

Yes Yes Yes Yes Yes 

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

SolventSolvent

Activator

Proppant

YesYesYesYes

YesYesYesYes

YesYesYesYes

YesYesYesYes

YesYesYesYes

Calculated

Proppant

Analytically

Yes Yes Yes Yes Yes 

YesYesYesYesYesYesYesYes

Calculated

Other, specify:

Analytically

Yes Yes Yes Yes Yes 

Calculated

Other, specify:

Analytically

Yes Yes Yes Yes Yes 

Calculated

Analytically

Friction reducer

Yes Yes Yes Yes Yes 

Wells- Oil Present UAD 100 ester, alkylaryl sulfonate trade secret, trade secret acid emulsifier Available 

Calculated

Analytically

Calculated

Analytically

Other, specify:Other, specify:

YesYes

YesYes

YesYes

YesYes

YesYes

CalculatedCalculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Other, specify:SurfactantFriction reducerBiocideBiocideBiocideSurfactant

Analytically

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

Calculated

Other, specify:

Analytically

Yes Yes Yes Yes Yes 

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

SolventSolvent

Activator

Proppant

YesYesYesYes

YesYesYesYes

YesYesYesYes

YesYesYesYes

YesYesYesYes

Calculated

Proppant

Analytically

Yes Yes Yes Yes Yes 

YesYesYesYesYesYesYesYes

Calculated

Other, specify:

Analytically

Yes Yes Yes Yes Yes 

Calculated

Other, specify:

Analytically

Yes Yes Yes Yes Yes 

Calculated

Analytically

Friction reducer

Yes Yes Yes Yes Yes 
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

Gelled Water for Cased Wells- Oil Present Xylene Xylene 1330-20-7 90-100% 

Formulation/Mixture 

Name Chemical Name CBI? 

Gelled Water for Cased Wells- Oil Present

SuperSurf 

Gelled Water for Cased Wells- Oil Present

Cla-Chek LP 

Gelled Water for Cased Wells- Oil Present

Unigel 19XL 

Gelled Water for Cased Wells- Oil Present

Unigel 5F 

Gelled Water for Cased Wells- Oil Present

Unigel 2XL 

Gelled Water for Cased Wells- Oil Present

Unigel 1XLR 

Gelled Water for Cased Wells- Oil Present

LEB-10X 

GBL-8X 

None Available

Octanol- Water Partition 

Coefficient Kow

None AvailableNone Available

Table 2. Chemical and Physical Properties of Chemical Constituents Please provide the chemical and physical properties of the chemical constituents listed in Table 1 above.

None Available None Available None Available None Available 

None Available None Available

None Available

None AvailableNone Available

Organic Carbon-Water Partition 

Coefficient KOC 

(L kg-1)

None AvailableNone Available

None Available

None AvailableNone AvailableNone Available

None Available

Distribution Coefficient Kd 

(L kg-1)

None AvailableNone AvailableNone AvailableNone AvailableNone Available

KH (acceptable units atm L mol1 or bar L mol-1 or Pa L mol-1 or 

atm m3 mol-1 or bar m3 mol-1 or 

Pa m3 mol-1) 

None AvailableNone AvailableNone AvailableNone Available

None AvailableNone Available

None AvailableNone Available

None Available

None AvailableNone AvailableNone Available None Available

Molar 

(g m

None AvailableNone AvailableNone Available

YesYesYesYesYesYesYesYes

Calculated

Solvent

Analytically

Yes Yes Yes Yes Yes 

Gelled Water for Cased Wells- Oil Present

GBL-8X 

Gelled Water for Cased Wells- Oil Present

Iron Sta IIC 

Gelled Water for Cased Wells- Oil Present

NDL-100 

Gelled Water for Cased Wells- Oil Present

Flomax 50 (CESI) 

Gelled Water for Cased Wells- Oil Present

Flomax 50 (Clearwater)

Gelled Water for Cased Wells- Oil Present

ALPHA 3385 

Gelled Water for Cased Wells- Oil Present

NE-50 

Gelled Water for Cased Wells- Oil Present

NE-70 

Gelled Water for Cased Wells- Oil Present

NE-90 

Gelled Water for Cased Wells- Oil Present

Uniflo 

Gelled Water for Cased Wells- Oil Present

Unislik 30 (kemira) 

Gelled Water for Cased Wells- Oil Present

Unislik 30 (champion) 

None Available 

None Available 

None Available None Available

None Available 

None Available None Available None AvailableNone Available None Available None Available None Available 

None Available None Available None Available None Available

None Available

None Available None Available 

None Available None Available None Available None Available

None Available 

None Available

None Available None Available None AvailableNone Available

None Available

None Available None Available None Available

None AvailableNone Available None Available

None Available

None Available None Available None Available

None Available None Available None Available

None Available

None Available None Available

None Available None Available None Available None Available None Available 

None AvailableNone Available

None Available None Available

None Available

None AvailableNone Available

None Available None Available

YesYesYesYesYesYesYesYesYesYesYesYesYesYesYesYesYes

Calculated

Solvent

Analytically

Yes Yes Yes Yes Yes 

YesYesYesYesYesYesYesYesYesYesYesYesYesYesYesYesYesYesYes

Calculated

Solvent

Analytically

Yes Yes Yes Yes Yes 

YesYes
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

Gelled Water for Cased Wells- Oil Present

BioClear 1000 

Gelled Water for Cased Wells- Oil Present

Unibac 

Gelled Water for Cased Wells- Oil Present

EC6116A 

Gelled Water for Cased Wells- Oil Present

ParaSurf 

Gelled Water for Cased Wells- Oil Present

Paranox 

Gelled Water for Cased Wells- Oil Present

Parasol II 

Gelled Water for Cased Wells- Oil Present

Mutual Solvent (MS10) 

Gelled Water for Cased Wells- Oil Present

HEX Activator 

Gelled Water for Cased Wells- Oil Present

Resin Coated Sand 

Gelled Water for Cased Wells- Oil Present

API Frac Sand 

Gelled Water for Cased Wells- Oil Present

Parahib 2000 

Gelled Water for Cased Wells- Oil Present

UAD 100 

Gelled Water for Cased Xylene 

None Available None Available None Available None Available None Available None Available None Available None Available None Available None Available None Available None AvailableNone Available None Available None Available None Available

None Available None Available

None Available None Available None Available 

None Available None Available None Available None Available

None Available 

None Available None Available None Available None Available

None Available 

None Available None AvailableNone Available None Available None Available None Available

None Available None Available 

None Available None Available None Available None Available None Available None Available None Available None Available None Available None Available None Available None Available None Available None Available None Available 

None Available

None Available

None Available 106.16 

None Available None Available None Available None Available None Available 2.77 - 3.15 None Available

YesYesYesYesYesYesYesYesYesYesYesYesYes

Gelled Water for Cased Wells- Oil Present

Xylene 

Formulation/Mixture 

Name Proppant Name CBI? Proppant Specifications CBI? Is the Proppant Resin Coated? CBI? Specify the Resin Coating Materials Used CBI?

Gelled Water for Cased Wells- Oil Present API Frac Sand 10/20 down to 70/140 mesh Not Applicable

Gelled Water for Cased Wells- Oil Present Resin Coated Sand 16/30, 20/40, 30/50, 40/70 mesh phenol-formaldehyde resin, formaldehyde, hexamethylenetetramine, iron 

Gelled Water for Cased Wells- Oil PresentGelled Water for Cased Wells- Oil PresentGelled Water for Cased Wells- Oil PresentGelled Water for Cased Wells- Oil PresentGelled Water for Cased Wells- Oil PresentTable 3. Proppant Constituents Please provide the chemical and physical properties of the proppants listed in Table 1 above.

2.77 - 3.15 None Available None Available None Available 106.16 

YesYes

No

Yes

No

Yes

No

Yes

No

Yes

No

Yes

NoNo

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYes

YesYes

NoNo

YesYes

YesYes

YesYes

YesYesYes
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

Gelled Water for Cased Wells- Oil Present SuperSurf See October 12, 2010 Narrative Responses 0.5 to 1 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Gelled Water for Cased 

Wells- Oil Present Cla-Chek LP See October 12, 2010 Narrative Responses 0.5 to 1 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Gelled Water for Cased 

Wells- Oil Present Unigel 19XL See October 12, 2010 Narrative Responses 7 to 20 lb/1000 gal See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Hercules Incorpo

Gelled Water for Cased 

Wells- Oil Present Unigel 5F See October 12, 2010 Narrative Responses 7 to 20 lb/1000 gal See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Hercules Incorpo

Gelled Water for Cased Wells- Oil Present Unigel 2XL See October 12, 2010 Narrative Responses 7 to 20 lb/1000 gal See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Hercules Incorpo

Gelled Water for Cased 

Wells- Oil Present Unigel 1XLR See October 12, 2010 Narrative Responses 7 to 20 lb/1000 gal See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Hercules Incorpo

Gelled Water for Cased Wells- Oil Present LEB-10X See October 12, 2010 Narrative Responses 0.05 to 0.2 qt/1000 gal See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Gelled Water for Cased Wells- Oil Present GBL-8X See October 12, 2010 Narrative Responses 0.05 to 0.2 qt/1000 gal See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses CESI Chemical 

Gelled Water for Cased 

Wells- Oil Present Iron Sta IIC See October 12, 2010 Narrative Responses 0.5 to 1 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Gelled Water for Cased 

Wells- Oil Present NDL-100 See October 12, 2010 Narrative Responses 0.5 to 2 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Gelled Water for Cased 

Wells- Oil Present Flomax 50 (CESI) See October 12, 2010 Narrative Responses 2 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses CESI Chemical 

Table 4. Formulation/Mixture Specifications

CBI? CBI? Specifications to Meet Site Requirements Rationale for Site Requirements CBI? CBI? Formulation/Mixture Name Constituent

Quantity of Constituent 

used in Hydraulic 

Fracturing (please 

specify units)

Concentration of 

Constituent as Injected 

(please indicate units)

Manufacture

Product and

Constituen

CBI?

YesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes 

Wells- Oil Present Flomax 50 (CESI) Narrative Responses Narrative Responses Narrative Responses CESI Chemical Gelled Water for Cased Wells- Oil Present

Flomax 50 (Clearwater)

See October 12, 2010 Narrative Responses

2 gpt See October 12, 2010 

Narrative Responses

See October 12, 2010 Narrative Responses

Clearwater EnginChemistry 

Gelled Water for Cased Wells- Oil Present ALPHA 3385 See October 12, 2010 Narrative Responses 1.5 gal/1000 lb of proppant See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Gelled Water for Cased Wells- Oil Present NE-50 See October 12, 2010 Narrative Responses 0.5 to 1 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Gelled Water for Cased Wells- Oil Present NE-70 See October 12, 2010 Narrative Responses 0.5 to 1 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Gelled Water for Cased 

Wells- Oil Present NE-90 See October 12, 2010 Narrative Responses 0.5 to 1 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Nalco 

Gelled Water for Cased 

Wells- Oil Present Uniflo See October 12, 2010 Narrative Responses 0.5 to 1 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Gelled Water for Cased 

Wells- Oil Present Unislik 30 (kemira) See October 12, 2010 Narrative Responses 0.5 to 1 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Kemira Water So

Inc 

Gelled Water for Cased 

Wells- Oil Present Unislik 30 (champion) See October 12, 2010 Narrative Responses 0.5 to 1 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Champion Techn

Gelled Water for Cased Wells- Oil Present BioClear 1000 See October 12, 2010 Narrative Responses 2 lb/500 bbl See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Gelled Water for Cased 

Wells- Oil Present Unibac See October 12, 2010 Narrative Responses 1 to 2 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Gelled Water for Cased Wells- Oil Present EC6116A See October 12, 2010 Narrative Responses 0.1 to 0.5 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Nalco 

Gelled Water for Cased Wells- Oil Present ParaSurf See October 12, 2010 Narrative Responses 25 to 50 gal per stage See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Gelled Water for Cased 

Wells- Oil Present Paranox See October 12, 2010 Narrative Responses 25 to 50 gal per stage See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Gelled Water for Cased 

Wells- Oil Present Parasol II See October 12, 2010 Narrative Responses 25 to 50 gal per stage See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Gelled Water for Cased 

Wells- Oil Present

Mutual Solvent (MS10) See October 12, 2010 Narrative Responses 25 to 50 gal per stage See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes YesYes

YesYes

YesYes

YesYes

YesYesYes

YesYesYes

YesYesYes

YesYesYes

YesYesYesYes

Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes 

Wells- Oil Present 10) Narrative Responses Narrative Responses Narrative Responses Chemistry 

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes YesYes

YesYes

YesYes

YesYes

YesYesYes

YesYesYes

YesYesYes

YesYesYes

YesYesYesYes

Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes 
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

Gelled Water for Cased Wells- Oil Present HEX Activator See October 12, 2010 Narrative Responses 10 to 20 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Hexion 

Gelled Water for Cased Wells- Oil Present Resin Coated Sand See October 12, 2010 Narrative Responses 1 to 5 lb/gal See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Santrol, Inc 

Gelled Water for Cased Wells- Oil Present API Frac Sand See October 12, 2010 Narrative Responses 0.25 to 5 lb/gal See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Various 

Gelled Water for Cased Wells- Oil Present Parahib 2000 See October 12, 2010 Narrative Responses 5 to 10 gal per 500 bbl See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Aquaness Chemi

Gelled Water for Cased Wells- Oil Present UAD 100 See October 12, 2010 Narrative Responses 1 to 5 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Aquaness Chemi

Gelled Water for Cased Wells- Oil Present Xylene See October 12, 2010 Narrative Responses 25 to 50 gal per stage See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

High Volum

Gelled Water for Cased Wells- Oil Present

Refer to response provided under "Range of Total Fluid Injected."

See October 12, 2010 Narrative Responses

See October 12, 2010 Narrative Responses

15,000 to 120,000 gal per stage; 1 to 6 stages per well

See October 12, 2010 Narrative Responses

See October 12Question 3 Adde

Table 5. Formulation/Mixture/Water Specifications

Formulation/Mixture 

Name

Quantity of Water 

Used 

(gallons)

Incoming Water 

Source Quality of Water

Range of Total Fluid 

Injected 

(Low to High)

(gallons)

Average Volume of 

Total Fluid Injected 

(gallons)

CBI? CBI? CBI? CBI?

CBI?

Geological Facto

Yes Yes Yes Yes Yes YesYesYes

YesYesYes

YesYesYes

YesYesYes

YesYesYes

YesYesYes

YesYesYes

YesYesYes

YesYesYes

Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes 
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

Slickwater Shale

Formulation/ Mixture 

Name

Chemical Name (Use 

IUPAC 

Nomenclature)

CBI? Chemical Formula CBI? Chemical Abstract System (CAS) Number CBI? Purpose of Chemical in Hydraulic Fracturing Fluid Formulation/Mixture CBI? Concentration as Delivered to Site (please indicate units) CBI? How was t

Concentrat

Determine

Slickwater Shale Unislik ST 50 hydrotreated light distillate 64742-47-8 10-30% 

Slickwater Shale FRP-121 None Available None Available None Available 

Slickwater Shale Flomax 50 (CESI) isopropanol, citrus terpenes 67-63-0, 94266-47-4 1-15%, 1-15% 

Slickwater Shale Flomax 50 (Clearwater) alcohol ethoxylated (C8 C10 4.5 mol), isopropyl alcohol, ethylene glycol 68439-45-2, 67-63-0, 107- 21-1 10-30%, 10-30%, 7-13% 

Slickwater Shale EC6116A

dibromoacetonitrile, 2,2-dibromo-3-nitrilopropionamide, 

polyethylene glycol

3252-43-5, 10222-01-2, 25322-68-3 1-5%, 10-30%, 30-60% 

Formulation/Mixture Name:Table 1. Chemical Constituents

Hydraulic Fracturing 

FORMULATION / MIXTURE SPECIFIC QUESTIONS

Please provide information on all constituents in the formulation/mixture. If Material Safety Data Sheets (MSDSs) are available, please attach them to your submittal. 

CalculatedCalculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Friction reducerFriction reducerSelectSelectScale inhibitor

Analytically

YesYesYesYesYes

YesYesYesYesYes

YesYesYesYesYes

YesYesYesYesYes

YesYesYesYesYes

Surfactant

Yes Yes Yes Yes

Biocide

Yes Yes Yes Yes

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Surfactant

Yes Yes Yes Yes

Slickwater Shale ScaleHib 100 ethylene glycol 107-21-1 30-60% 

Slickwater Shale Iron Sta IIC ethylene glycol 107-21-1 10-30% 

Slickwater Shale Unigel CMHPG carboxymethylhydroxypr opyl guar blend None Available None Available 

Slickwater Shale LEB-10X ethylene glycol 107-21-1 30-60% 

Slickwater Shale GBL-8X None Available None Available None Available 

Slickwater Shale O2 Scavenger ammonium bisulfite 10192-30-0 65-100% 

Slickwater Shale Adomite Aqua talc, oxyalkylated alcohol, perlite 14807-96-6, Proprietary, 93763-70-3, 55465-40-2

fluid leakoff control

5-10%, 1-5%, 5-10% 

Slickwater Shale Adomite Regain (FLC- 100) starch 9005-25-8 fluid leakoff control 30-60% 

Slickwater Shale NCL ethylene glycol 107-21-1 30-60% 

CalculatedCalculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Friction reducerFriction reducerSelectSelectScale inhibitorSelectGelling agent

Analytically

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

CalculatedCalculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

SelectSelectOxygen scavengerOther, specify:Other, specify:Clay control

Analytically

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYes

Surfactant

Yes Yes Yes Yes

Biocide

Yes Yes Yes Yes

Iron control

Yes Yes Yes Yes

Breaker fluid

Yes Yes Yes Yes

Breaker fluid

Yes Yes Yes Yes

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Surfactant

Yes Yes Yes Yes

CalculatedCalculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Friction reducerFriction reducerSelectSelectScale inhibitorSelectGelling agent

Analytically

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

CalculatedCalculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

SelectSelectOxygen scavengerOther, specify:Other, specify:Clay control

Analytically

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYes

Surfactant

Yes Yes Yes Yes

Biocide

Yes Yes Yes Yes

Iron control

Yes Yes Yes Yes

Breaker fluid

Yes Yes Yes Yes

Breaker fluid

Yes Yes Yes Yes

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Surfactant

Yes Yes Yes Yes
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

Slickwater Shale Resin Coated Sand

phenol-formaldehyde resin, formaldehyde, hexamethylenetetramine

, iron oxide (fume), 

9003-35-4, 50-00-0, 1009-7-0, 1309-37-1, 1332-58-7, 108-95-2, 14808-60-7

1-6%, <0.01%, <1%,<15%, <5%, <0.01%, Balance

Slickwater Shale Ceramic Proppant corundum, mullite 1302-74-5, 1302-93-8 40-60%, 35-60% 

Slickwater Shale API Frac Sand

crystalline silica (quartz), aluminum oxide, iron oxide, titanium oxide

14808-60-7, 1344-28-1, 1309-37-1, 13463-67-7

99.0-99.9%, <0.8%, <0.1%, <0.1% 

Formulation/Mixture 

Name Chemical Name CBI? 

Slickwater Shale

Unislik ST 50 

Slickwater Shale

FRP-121 

Slickwater Shale

Flomax 50 (CESI) 

Slickwater Shale

Flomax 50 (Clearwater)

EC6116A 

None Available None Available

None Available None Available

None AvailableNone AvailableNone AvailableNone Available 

Octanol- Water Partition 

Coefficient Kow

None AvailableNone AvailableNone Available

None Available None Available

Molar 

(g m

None Available

None Available None Available

None AvailableNone AvailableNone Available None Available

None Available 

KH (acceptable units atm L mol1 or bar L mol-1 or Pa L mol-1 or 

atm m3 mol-1 or bar m3 mol-1 or 

Pa m3 mol-1) 

None Available

Distribution Coefficient Kd 

(L kg-1)

Organic Carbon-Water Partition 

Coefficient KOC 

(L kg-1)

Table 2. Chemical and Physical Properties of Chemical Constituents Please provide the chemical and physical properties of the chemical constituents listed in Table 1 above.

None Available

None Available None Available

YesYesYesYes

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Calculated

Analytically

Proppant

Yes Yes Yes Yes Yes 

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Proppant

Yes Yes Yes Yes

Proppant

Yes Yes Yes Yes

Yes

Slickwater Shale

EC6116A 

Slickwater Shale

ScaleHib 100 

Slickwater Shale

Iron Sta IIC 

Slickwater Shale Unigel CMHPG 

Slickwater Shale

LEB-10X 

Slickwater Shale

GBL-8X 

Slickwater Shale

O2 Scavenger 

Slickwater Shale

Adomite Aqua 

Slickwater Shale Adomite Regain (FLC- 100) Slickwater Shale

NCL 

Slickwater Shale

Resin Coated Sand 

Slickwater Shale Ceramic Proppant 

Slickwater Shale

API Frac Sand 

None Available None AvailableNone Available

None AvailableNone Available

None AvailableNone AvailableNone AvailableNone Available None Available

None Available None Available

None Available None AvailableNone Available None Available 

None AvailableNone AvailableNone Available

None AvailableNone Available

None AvailableNone Available

None Available None Available None Available None AvailableNone Available None Available None AvailableNone Available None Available None AvailableNone Available None Available None AvailableNone Available None Available None Available None Available None AvailableNone Available None Available None AvailableNone Available None AvailableNone Available None Available None Available None AvailableNone Available None Available None Available

None Available None AvailableNone Available None Available None Available

None Available None Available None Available

None AvailableNone Available

None Available None Available

YesYesYesYesYesYesYes

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Calculated

Analytically

Proppant

Yes Yes Yes Yes Yes 

YesYesYesYesYesYesYesYes

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Yes

Proppant

Yes Yes Yes Yes

Proppant

Yes Yes Yes Yes

Yes

Slickwater Shale

YesYesYesYesYesYesYes

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Calculated

Analytically

Proppant

Yes Yes Yes Yes Yes 

YesYesYesYesYesYesYesYes

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Yes

Proppant

Yes Yes Yes Yes

Proppant

Yes Yes Yes Yes

Yes
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

Formulation/Mixture 

Name Proppant Name CBI? Proppant Specifications CBI? Is the Proppant Resin Coated? CBI? Specify the Resin Coating Materials Used CBI?

Slickwater Shale Resin Coated Sand 16/30, 20/40, 30/50, 40/70 mesh phenol-formaldehyde resin, formaldehyde, hexamethylenetetramine, iron 

Slickwater Shale Ceramic Proppant 40/80 Not ApplicableSlickwater Shale API Frac Sand 20/40, 30/50, 40/70, 70/140 Not ApplicableSlickwater ShaleSlickwater ShaleSlickwater ShaleSlickwater ShaleTable 3. Proppant Constituents Please provide the chemical and physical properties of the proppants listed in Table 1 above.

YesYes

No

Yes

No

Yes

No

Yes

No

Yes

No

Yes

NoNo

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

Yes

No

Yes Yes Yes
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

Slickwater Shale Unislik ST 50 See October 12, 2010 Narrative Responses 0.5 to 1.5 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses CESI Chemical 

Slickwater Shale FRP-121 See October 12, 2010 Narrative Responses 3 to 7 lb/1000 gal See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses SNF, Inc Slickwater Shale Flomax 50 (CESI) See October 12, 2010 Narrative Responses 2 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses CESI Chemical Slickwater Shale Flomax 50 (Clearwater) See October 12, 2010 Narrative Responses 2 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Slickwater Shale EC6116A See October 12, 2010 Narrative Responses 0.1 to 0.5 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Nalco 

Slickwater Shale ScaleHib 100 See October 12, 2010 Narrative Responses 0.1 to 0.4 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Slickwater Shale Iron Sta IIC See October 12, 2010 Narrative Responses 0.2 to 0.5 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Slickwater Shale Unigel CMHPG See October 12, 2010 Narrative Responses 25 to 50 lb per stage See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Herculed Incorpo

Slickwater Shale LEB-10X See October 12, 2010 Narrative Responses 0.05 to 0.2 qt/1000 gal See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Slickwater Shale GBL-8X See October 12, 2010 Narrative Responses 0.05 to 0.2 qt/1000 gal See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Slickwater Shale O2 Scavenger See October 12, 2010 Narrative Responses 0.1 to 0.5 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

CBI?

Rationale for Site 

Requirements

Table 4. Formulation/Mixture Specifications

CBI? CBI? Formulation/Mixture Name Constituent

Quantity of Constituent 

used in Hydraulic 

Fracturing (please 

specify units)

Concentration of 

Constituent as Injected 

(please indicate units)

Specifications to Meet Site 

Requirements CBI? CBI?

Manufacture

Product and

Constituen

YesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYes

Yes Yes Yes Yes Yes 

Narrative Responses Narrative Responses Narrative Responses Chemistry

Slickwater Shale Adomite Aqua See October 12, 2010 Narrative Responses 50 to 200 lb per stage See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Nalco 

Slickwater Shale Adomite Regain (FLC- 100) See October 12, 2010 Narrative Responses 50 to 200 lb per stage See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Nalco 

Slickwater Shale NCL See October 12, 2010 Narrative Responses 2 to 3 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Slickwater Shale Resin Coated Sand See October 12, 2010 Narrative Responses 1 to 5 lb per gallon See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Santrol, Inc 

Slickwater Shale Ceramic Proppant See October 12, 2010 Narrative Responses 1 to 5 lb per gallon See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Carbo Ceramics 

Slickwater Shale API Frac Sand See October 12, 2010 Narrative Responses 0.1 to 4 lb per gallon See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Various 

High Volum

Slickwater Shale Refer to response 

provided under "Range of Total Fluid Injected." 

See October 12, 2010 Narrative Responses

pH: 5 to 8, Temperature: 32 to 100F, Chlorides: < 50,000 mg/l, Iron: < 50 mg/l, sulfates: < 50 mg/l

300,000 to 500,000 gal per stage; 8 to 16 stages per well

See October 12, 2010 Narrative Responses

See October 12Question 3 Adde

CBI?

Geological Facto

CBI? CBI?

Range of Total Fluid 

Injected 

(Low to High)

(gallons)

Formulation/Mixture 

Name

Quantity of Water 

Used 

(gallons)

Incoming Water 

Source Quality of Water

Table 5. Formulation/Mixture/Water Specifications

Average Volume of 

Total Fluid Injected 

(gallons)

CBI? CBI?

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes 
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

Nitrogen

Formulation/ Mixture 

Name

Chemical Name (Use 

IUPAC 

Nomenclature)

CBI? Chemical Formula CBI? Chemical Abstract System (CAS) Number CBI? Purpose of Chemical in Hydraulic Fracturing Fluid Formulation/Mixture CBI? Concentration as Delivered to Site (please indicate units) CBI? How was t

Concentrat

Determine

Nitrogen Nitrogen Nitrogen 7727-37-9

Gas Fracturing Fluid

100% 

Nitrogen Flomax 50 (CESI) isopropanol, citrus terpenes 67-63-0, 94266-47-4 1-15%, 1-15% 

Nitrogen Flomax 50 (Clearwater) alcohol ethoxylated (C8 C10 4.5 mol), isopropyl alcohol, ethylene glycol 68439-45-2, 67-63-0, 107- 21-1 10-30%, 10-30%, 7-13% 

Nitrogen BioClear 1000 2,2-dibromo-3- nitrilopropionamide 10222-01-2 97.6% 

Nitrogen Cla-Chek LP ethylene glycol 107-21-1 30-60% 

Hydraulic Fracturing 

FORMULATION / MIXTURE SPECIFIC QUESTIONS

Please provide information on all constituents in the formulation/mixture. If Material Safety Data Sheets (MSDSs) are available, please attach them to your submittal. Formulation/Mixture Name:Table 1. Chemical Constituents

CalculatedCalculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Other, specify:SelectSelectSelectSelect

Analytically

YesYesYesYesYes

YesYesYesYesYes

YesYesYesYesYes

YesYesYesYesYes

YesYesYesYesYes

Calculated

Analytically

Clay control

Yes Yes Yes Yes Yes 

Calculated

Analytically

Biocide

Yes Yes Yes Yes Yes 

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Surfactant

Yes Yes Yes Yes

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Surfactant

Yes Yes Yes YesYes YesYes Yes

NitrogenNitrogenNitrogen

Formulation/Mixture 

Name

Chemical None 

Availableme CBI? 

Nitrogen

Nitrogen 

Nitrogen Flomax 50 (CESI) 

Nitrogen

Flomax 50 (Clearwater)

Nitrogen

BioClear 1000 

Nitrogen

Cla-Chek LP 

None AvailableNone Available

Table 2. Chemical and Physical Properties of Chemical Constituents Please provide the chemical and physical properties of the chemical constituents listed in Table 1 above.

Octanol- Water Partition 

Coefficient Kow

None Available

Organic Carbon-Water Partition 

Coefficient KOC 

(L kg-1)

None Available None Available None Available

None AvailableNone AvailableNone AvailableNone Available

None Available

None AvailableNone AvailableNone Available None Available None Available

KH (acceptable units atm L mol1 or bar L mol-1 or Pa L mol-1 or 

atm m3 mol-1 or bar m3 mol-1 or 

Pa m3 mol-1) 

None AvailableNone AvailableNone Available

None AvailableNone Available

Distribution Coefficient Kd 

(L kg-1)

None AvailableNone AvailableNone Available

Molar 

(g m

28.02

CalculatedCalculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Other, specify:SelectSelectSelectSelectSelectSelect

Analytically

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYes

Calculated

Analytically

Clay control

Yes Yes Yes Yes Yes 

Calculated

Analytically

Biocide

Yes Yes Yes Yes Yes 

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Surfactant

Yes Yes Yes Yes

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Surfactant

Yes Yes Yes YesYes YesYes Yes

Yes

Nitrogen

CalculatedCalculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Other, specify:SelectSelectSelectSelectSelectSelect

Analytically

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYes

Calculated

Analytically

Clay control

Yes Yes Yes Yes Yes 

Calculated

Analytically

Biocide

Yes Yes Yes Yes Yes 

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Surfactant

Yes Yes Yes Yes

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Surfactant

Yes Yes Yes YesYes YesYes Yes

Yes
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

Nitrogen

0

Nitrogen

0

Nitrogen

0

Formulation/Mixture 

Name Proppant Name CBI? Proppant Specifications CBI? Is the Proppant Resin Coated? CBI? Specify the Resin Coating Materials Used CBI?

Nitrogen Not ApplicableNitrogenNitrogenNitrogenNitrogenNitrogenTable 3. Proppant Constituents Please provide the chemical and physical properties of the proppants listed in Table 1 above.

YesYes

No

Yes

No

Yes

No

Yes

No

Yes

NoNo

YesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

Nitrogen

YesYes

No

Yes

No

Yes

No

Yes

No

Yes

No

Yes

NoNo

YesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

Nitrogen Nitrogen See October 12, 2010 Narrative Responses 100% except while dropping frac balls See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Various Nitrogen Flomax 50 (CESI) See October 12, 2010 Narrative Responses 2 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses CESI Chemical 

Nitrogen Flomax 50 (Clearwater) See October 12, 2010 Narrative Responses 2 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Nitrogen BioClear 1000 See October 12, 2010 Narrative Responses 2 lb/500 bbl See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Nitrogen Cla-Chek LP See October 12, 2010 Narrative Responses 0.5 to 1 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Nitrogen 0Nitrogen 0Nitrogen 0NitrogenNitrogen 0Nitrogen 0

CBI? CBI? Specifications to Meet Site Requirements Rationale for Site Requirements Formulation/Mixture Name Constituent

Quantity of Constituent 

used in Hydraulic 

Fracturing (please 

specify units)

Concentration of 

Constituent as Injected 

(please indicate units)

Manufacture

Product and

Constituen

CBI? CBI? CBI?

Table 4. Formulation/Mixture Specifications

YesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYes

Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes 

Yes Yes Yes Yes Yes 

Nitrogen 0Nitrogen 0Nitrogen 0Nitrogen 0

High Volum

Nitrogen

Refer to response provided under "Range of Total Fluid Injected."

See October 12, 2010 Narrative Responses

See October 12, 2010 Narrative Responses

200 to 2,000 gal per stage; 9 to 25 stages per well

See October 12, 2010 Narrative Responses

See October 12Question 3 Adde

Formulation/Mixture 

Name

Quantity of Water 

Used 

(gallons)

Incoming Water 

Source Quality of Water

Range of Total Fluid 

Injected 

(Low to High)

(gallons)

Average Volume of 

Total Fluid Injected 

(gallons)

CBI? CBI? CBI? CBI?

Table 5. Formulation/Mixture/Water Specifications

CBI?

Geological Facto

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

Yes Yes Yes Yes Yes 

Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes 

Yes Yes Yes Yes Yes 
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

Crosslink

Formulation/ Mixture 

Name

Chemical Name (Use 

IUPAC 

Nomenclature)

CBI? Chemical Formula CBI? Chemical Abstract System (CAS) Number CBI? Purpose of Chemical in Hydraulic Fracturing Fluid Formulation/Mixture CBI? Concentration as Delivered to Site (please indicate units) CBI? How was the Concentration Determined? 

Crosslink Unigel 19XL guar gum None Available > 95% 

Crosslink Unilink 8.5

ethylene glycol, boric acid,proprietary component

107-21-1, 10043-35-3, Proprietary 15-40%, 3-7%, 15-40% 

Crosslink Flomax 50 (CESI) isopropanol, citrus terpenes 67-63-0, 94266-47-4 1-15%, 1-15% 

Crosslink Flomax 50 (Clearwater) alcohol ethoxylated (C8 C10 4.5 mol), isopropyl alcohol, ethylene glycol 68439-45-2, 67-63-0, 107- 21-1 10-30%, 10-30%, 7-13% 

Crosslink LEB-10X ethylene glycol 107-21-1 30-60% 

Crosslink GBL-8X None Available None Available None Available 

Crosslink SuperSurf methanol 67-56-1 30-60% 

Hydraulic Fracturing 

FORMULATION / MIXTURE SPECIFIC QUESTIONS

Please provide information on all constituents in the formulation/mixture. If Material Safety Data Sheets (MSDSs) are available, please attach them to your submittal. Formulation/Mixture Name:Table 1. Chemical Constituents

CalculatedCalculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

SelectCross-linkerSelectSelectSelectSelect

Analytically

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYes

Calculated

Analytically

Gelling agent

Yes Yes Yes Yes Yes 

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Surfactant

Yes Yes Yes Yes

CalculatedCalculated

Analytically

SelectSelect

Analytically

YesYes

YesYes

YesYes

YesYes

YesYes

Breaker fluid

Yes Yes Yes Yes

Breaker fluid

Yes Yes Yes Yes

Surfactant Calculated

Analytically

Yes Yes Yes Yes Yes 

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Surfactant

Yes Yes Yes YesYes YesYes YesYes YesYes Yes

Crosslink SuperSurf methanol 67-56-1 30-60% Crosslink Cla-Chek LP ethylene glycol 107-21-1 30-60% 

Crosslink NE-50 isopropyl alcohol, methanol 67-63-0, 67-56-1

Non-emulsifier

30-60%, 10-30% 

Crosslink NE-90

methanol, heavy aromatic naphtha, polyethylene glycol, 

isopropanol, (EO-C7-9-

67-56-1, 64742-94-5, 25322-68-3, 67-63-0, 78330-19-5, 78330-20-8, 104-76-7, 91-20-3 Non-emulsifier

30-60%, 1-5%, 1-5%, 5-10%, 1-5%, 1-5%, 5-10%, 0.1-1%

Crosslink Soda Ash sodium carbonate 497-19-8 None Available 

Crosslink ALPHA 3385

(solvent naptha, petroleum aromatic), 

(poly(oxy-1,ethanediyl),a-(nonylphenol)-w-hydroxy64742-94-5, 51811-79-1, 91-20-3 Sand Control 65-100%, 30-60%, 3-7% 

Crosslink API Frac Sand

crystalline silica (quartz), aluminum oxide, iron oxide, titanium oxide

14808-60-7, 1344-28-1, 1309-37-1, 13463-67-7

99.0-99.9%, <0.8%, <0.1%, <0.1% 

Crosslink BioClear 1000 2,2-dibromo-3- nitrilopropionamide 10222-01-2 97.6% 

Crosslink NCL ethylene glycol 107-21-1 30-60% 

CalculatedCalculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

SelectCross-linkerSelectSelectSelectSelectSelect

Analytically

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

SelectSelectpH controlSelect

YesYesYesYes

YesYesYesYes

YesYesYesYes

YesYesYesYes

YesYesYesYes

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Calculated

Analytically

Gelling agent

Yes Yes Yes Yes Yes 

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Surfactant

Yes Yes Yes Yes

CalculatedCalculated

Analytically

SelectSelect

Analytically

YesYes

YesYes

YesYes

YesYes

YesYes

Breaker fluid

Yes Yes Yes Yes

Breaker fluid

Yes Yes Yes Yes

Surfactant Calculated

Analytically

Yes Yes Yes Yes Yes 

Calculated

Analytically

Clay control

Yes Yes Yes Yes Yes 

Calculated

Analytically

Other, specify:

Yes Yes Yes Yes Yes 

Other, specify: Calculated

Analytically

Yes Yes Yes Yes Yes 

Calculated

Analytically

Other, specify:

Yes Yes Yes Yes Yes 

Proppant Calculated

Analytically

Yes Yes Yes Yes Yes 

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Proppant Calculated

Analytically

Yes Yes Yes Yes Yes 

Calculated

Analytically

Biocide

Yes Yes Yes Yes Yes 

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Proppant Calculated

Analytically

Yes Yes Yes Yes Yes 

Calculated

Analytically

Biocide

Yes Yes Yes Yes Yes 

Calculated

Analytically

Clay control

Yes Yes Yes Yes 

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Surfactant

Yes Yes Yes YesYes YesYes YesYes YesYes Yes
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

Formulation/Mixture 

Name Chemical Name CBI? 

Crosslink

Unigel 19XL 

Crosslink

Unilink 8.5 

Crosslink

Flomax 50 (CESI) 

Crosslink

Flomax 50 (Clearwater)

Crosslink

LEB-10X 

Crosslink

GBL-8X 

Crosslink SuperSurf 

Crosslink

Cla-Chek LP 

Crosslink

NE-50 

Crosslink

NE-90 

Soda Ash None Available None Available None Available 

None Available None AvailableNone Available None AvailableNone Available None Available None Available None Available None Available 

None Available None Available None Available 

None AvailableNone Available

None Available

None AvailableNone Available

None Available None Available

None AvailableNone Available

None AvailableNone AvailableNone Available

None AvailableNone AvailableNone Available

None Available

None Available None Available 

None AvailableNone Available

None AvailableNone Available

None Available

None Available

Distribution Coefficient Kd 

(L kg-1)

None Available

KH (acceptable units atm L mol1 or bar L mol-1 or Pa L mol-1 or 

atm m3 mol-1 or bar m3 mol-1 or 

Pa m3 mol-1) 

None Available

Molar Mass 

(g mol-1) 

None Available

None Available None AvailableNone AvailableNone Available

Organic Carbon-Water Partition 

Coefficient KOC 

(L kg-1)

None AvailableNone AvailableNone AvailableNone AvailableNone Available

None Available

Octanol- Water Partition 

Coefficient Kow

None Available

Table 2. Chemical and Physical Properties of Chemical Constituents Please provide the chemical and physical properties of the chemical constituents listed in Table 1 above.

None AvailableNone Available

YesYesYesYesYesYesYesYesYesYesYes

Crosslink

Soda Ash 

Crosslink

ALPHA 3385 

Crosslink

API Frac Sand 

Crosslink

BioClear 1000 

Crosslink

NCL 

Formulation/Mixture 

Name Proppant Name CBI? Proppant Specifications CBI? Is the Proppant Resin Coated? CBI? Specify the Resin Coating Materials Used CBI?

Crosslink API Frac Sand 16/30, 20/40, 30/50 Not ApplicableCrosslinkCrosslinkCrosslinkCrosslinkCrosslink

Crosslink

None AvailableNone Available

None Available None Available None Available 

None Available None Available None Available 

None Available None Available

None Available None Available None Available None AvailableNone Available None Available None AvailableNone AvailableNone Available

None Available None Available None Available 

None Available 

None Available None Available

Table 3. Proppant Constituents Please provide the chemical and physical properties of the proppants listed in Table 1 above.

YesYes

No

Yes

No

Yes

No

Yes

No

Yes

No

Yes

NoNo

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYesYes

Crosslink

YesYes

No

Yes

No

Yes

No

Yes

No

Yes

No

Yes

NoNo

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYesYes
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

Crosslink Unigel 19XL See October 12, 2010 Narrative Responses 15 to 40 lb per 1000 gal See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Hercules Incorporated 

Crosslink Unilink 8.5 See October 12, 2010 Narrative Responses 2 to 3 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engineered Chemistry 

Crosslink Flomax 50 (CESI) See October 12, 2010 Narrative Responses 2 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses CESI Chemical 

Crosslink Flomax 50 (Clearwater) See October 12, 2010 Narrative Responses 2 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engineered Chemistry 

Crosslink LEB-10X See October 12, 2010 Narrative Responses 0.05 to 0.4 qt per 1000 gal See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engineered Chemistry Crosslink GBL-8X See October 12, 2010 Narrative Responses 0.05 to 0.4 qt per 1000 gal See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses CESI Chemical 

Crosslink SuperSurf See October 12, 2010 Narrative Responses 0.5 to 1 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engineered Chemistry 

Crosslink Cla-Chek LP See October 12, 2010 Narrative Responses 0.5 to 1 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engineered Chemistry Crosslink NE-50 See October 12, 2010 Narrative Responses 0.5 to 1 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engineered Chemistry Crosslink NE-90 See October 12, 2010 Narrative Responses 0.5 to 1 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Nalco 

Crosslink Soda Ash See October 12, 2010 Narrative Responses 3 to 10 lb per 1000 gal See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engineered Chemistry Crosslink ALPHA 3385 See October 12, 2010 Narrative Responses 1.5 gal per 1000 lb proppant See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engineered Chemistry Crosslink API Frac Sand See October 12, 2010 Narrative Responses 2 to 10 lb per gallon See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Various 

See October 12, 2010 2 lb per 500 bbl See October 12, 2010 See October 12, 2010 Clearwater Engineered 

CBI? CBI? CBI? CBI? CBI? Specifications to Meet Site Requirements Rationale for Site Requirements

Table 4. Formulation/Mixture Specifications

Formulation/Mixture 

Name Constituent

Quantity of 

Constituent used in 

Hydraulic Fracturing 

(please specify units)

Concentration of 

Constituent as Injected 

(please indicate units)

Manufacturer of 

Product and/or 

Constituents

YesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYes

Yes Yes Yes Yes Yes 

Crosslink BioClear 1000 See October 12, 2010 Narrative Responses 2 lb per 500 bbl See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engineered Chemistry Crosslink NCL See October 12, 2010 Narrative Responses 2-3 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engineered Chemistry 

High Volume 

Crosslink

Refer to response provided under "Range of Total Fluid Injected"

See October 12, 2010 Narrative Responses

See October 12, 2010 Narrative Responses

10,000 to 50,000 gal per stage; 1 to 5 stages per well

See October 12, 2010 Narrative Responses

See October 12, 201Question 3 Addendu

CBI?

Geological Factors 

Table 5. Formulation/Mixture/Water Specifications

Formulation/Mixture 

Name

Quantity of Water 

Used 

(gallons)

Incoming Water 

Source Quality of Water

Range of Total Fluid 

Injected 

(Low to High)

(gallons)

Average Volume of 

Total Fluid Injected 

(gallons)

CBI? CBI? CBI? CBI?

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes 
November 19, 2010 Response of Patterson-UTI Energy, Inc. to 

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

Gelled Water for Openhole Wells- Oil or Gas

Formulation/ Mixture 

Name

Chemical Name (Use 

IUPAC 

Nomenclature)

CBI? Chemical Formula CBI? Chemical Abstract System (CAS) Number CBI? Purpose of Chemical in Hydraulic Fracturing Fluid Formulation/Mixture CBI? Concentration as Delivered to Site (please indicate units) CBI? How was the Concentratio

Determined? 

Gelled Water for Openhole Wells- Oil or Gas

Uniflo II

docecylbenzene sulfonic acid, glycol ethers, isopropyl alcohol

27176-87-0, 111-76-2, 67-63-0 5-10%, 3-7%, 15-40% 

Gelled Water for Openhole Wells- Oil or Gas

Cla-Chek A ethylene glycol 107-21-1 40-70% 

Gelled Water for Openhole Wells- Oil or Gas

NE-50 isopropyl alcohol, methanol 67-63-0, 67-56-1

Non-emulsifier

30-60%, 10-30% 

Gelled Water for Openhole Wells- Oil or Gas

NE-90

methanol, heavy aromatic naphtha, polyethylene glycol, 

isopropanol, (EO-C7-9-

67-56-1, 64742-94-5, 25322-68-3, 67-63-0, 78330-19-5, 78330-20-8, 104-76-7, 91-20-3 Non-emulsifier

30-60%, 1-5%, 1-5%, 5-10%, 1-5%, 1-5%, 5-10%, 0.1-1%

Gelled Water for Openhole Wells- Oil or 

Gas

Unigel 19XL guar gum None Available > 95% 

Hydraulic Fracturing 

FORMULATION / MIXTURE SPECIFIC QUESTIONS

Please provide information on all constituents in the formulation/mixture. If Material Safety Data Sheets (MSDSs) are available, please attach them to your submittal. 

Formulation/Mixture Name:Table 1. Chemical Constituents

CalculatedCalculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

SurfactantClay controlSelectSelectSelect

Analytically

YesYesYesYesYes

YesYesYesYesYes

YesYesYesYesYes

YesYesYesYesYes

YesYesYesYesYes

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Calculated

Analytically

Other, specify:

Yes Yes Yes Yes Yes 

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Other, specify: Calculated

Analytically

Yes Yes Yes Yes Yes 

Calculated Select

Analytically

Yes Yes Yes Yes Yes 

Calculated

Analytically

Gelling agent

Gas Yes Yes Yes Yes Yes Gelled Water for Openhole Wells- Oil or Gas

Unigel 5F guar gum None Available > 95% 

Gelled Water for Openhole Wells- Oil or Gas

ICA-1 citric acid 77-92-9 90-100% 

Gelled Water for Openhole Wells- Oil or Gas

LEB-10X ethylene glycol 107-21-1 30-60% 

Gelled Water for Openhole Wells- Oil or Gas

GBL-8X None Available None Available None Available 

Gelled Water for Openhole Wells- Oil or Gas

Benzoic Acid Flakes Benzoic Acid 65-85-0

diverting agent

None Available 

Gelled Water for Openhole Wells- Oil or Gas

API Frac Sand

crystalline silica (quartz), aluminum oxide, iron oxide, titanium oxide

14808-60-7, 1344-28-1, 1309-37-1, 13463-67-7

99.0-99.9%, <0.8%, <0.1%, <0.1% 

CalculatedCalculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

SurfactantClay controlSelectSelectSelectSelectIron control

Analytically

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

SelectSelectOther, specify:Select

YesYesYesYes

YesYesYesYes

YesYesYesYes

YesYesYesYes

YesYesYesYes

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Calculated

Analytically

Other, specify:

Yes Yes Yes Yes Yes 

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Other, specify: Calculated

Analytically

Yes Yes Yes Yes Yes 

Calculated Select

Analytically

Yes Yes Yes Yes Yes 

Calculated

Analytically

Gelling agent

Yes Yes Yes Yes Yes 

Calculated

Analytically

Gelling agent

Yes Yes Yes Yes Yes 

Calculated

Analytically

Calculated

Analytically

SelectSelect

YesYes

YesYes

YesYes

YesYes

YesYes

CalculatedCalculated

Analytically

SelectSelect

Analytically

YesYes

YesYes

YesYes

YesYes

YesYes

Breaker fluid

Yes Yes Yes Yes

Breaker fluid

Yes Yes Yes Yes

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Calculated Proppant

Analytically

Yes Yes Yes Yes Yes 
November 19, 2010 Response of Patterson-UTI Energy, Inc. to 

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

Formulation/Mixture 

Name Chemical Name CBI? 

Gelled Water for Openhole Wells- Oil or Gas

Uniflo II 

Gelled Water for Openhole Wells- Oil or Gas

Cla-Chek A 

Gelled Water for Openhole Wells- Oil or Gas

NE-50 

Gelled Water for Openhole Wells- Oil or Gas

NE-90 

Gelled Water for Openhole Wells- Oil or Gas

Unigel 19XL 

Gelled Water for Openhole Wells- Oil or 

Gas

Unigel 5F 

Gelled Water for Openhole Wells- Oil or 

Gas

ICA-1 

Gelled Water for Openhole Wells- Oil or Gas

LEB-10X 

Gelled Water for Openhole Wells- Oil or 

Gas

GBL-8X 

Gelled Water for Benzoic Acid Flakes 

Table 2. Chemical and Physical Properties of Chemical Constituents Please provide the chemical and physical properties of the chemical constituents listed in Table 1 above.

-1.72 @ 20C

Octanol- Water Partition 

Coefficient Kow

None AvailableNone Available None Available None Available

None Available None Available 

None Available None Available None Available None Available None AvailableNone Available None Available None Available

None Available 

None AvailableNone AvailableNone Available

None AvailableNone Available

None Available None Available

None Available None Available

Organic Carbon-Water Partition 

Coefficient KOC 

(L kg-1)

None AvailableNone Available

None AvailableNone AvailableNone Available

None AvailableNone AvailableNone Available

None Available

Molar M

(g mol

None AvailableNone AvailableNone Available

KH (acceptable units atm L mol1 or bar L mol-1 or Pa L mol-1 or 

atm m3 mol-1 or bar m3 mol-1 or 

Pa m3 mol-1) 

None AvailableNone Available

None Available

Distribution Coefficient Kd 

(L kg-1)

None AvailableNone AvailableNone AvailableNone AvailableNone AvailableNone Available

None Available 

None AvailableNone AvailableNone Available

YesYesYesYesYesYesYesYesYesYes

Gelled Water for Openhole Wells- Oil or Gas

Benzoic Acid Flakes 

Gelled Water for Openhole Wells- Oil or Gas

API Frac Sand 

Formulation/Mixture 

Name Proppant Name CBI? Proppant Specifications CBI? Is the Proppant Resin Coated? CBI? Specify the Resin Coating Materials Used CBI?

Gelled Water for Openhole Wells- Oil or Gas

API Frac Sand 10/20, 16/30,20/40 Not Applicable

Gelled Water for Openhole Wells- Oil or GasGelled Water for Openhole Wells- Oil or GasGelled Water for Openhole Wells- Oil or GasGelled Water for Openhole Wells- Oil or GasGelled Water for Openhole Wells- Oil or GasGelled Water for Openhole Wells- Oil or Gas

None Available

Table 3. Proppant Constituents Please provide the chemical and physical properties of the proppants listed in Table 1 above.

None Available None Available

None Available None Available

None Available None Available

None Available None Available 

None Available

YesYes

No

Yes

No

Yes

No

Yes

No

Yes

No

Yes

NoNo

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYes
November 19, 2010 Response of Patterson-UTI Energy, Inc. to 

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

Gelled Water for Openhole Wells- Oil or GasGelled Water for Openhole Wells- Oil or GasGelled Water for Openhole Wells- Oil or GasGelled Water for Openhole Wells- Oil or GasGelled Water for Openhole Wells- Oil or Uniflo II See October 12, 2010 Narrative Responses 0.5 to 1 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Enginee

Chemistry 

Gelled Water for Openhole Wells- Oil or Cla-Chek A See October 12, 2010 Narrative Responses 0.5 to 1 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Enginee

Chemistry 

Gelled Water for 

Openhole Wells- Oil or NE-50 See October 12, 2010 Narrative Responses 0.5 to 1 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Enginee

Chemistry 

Gelled Water for Openhole Wells- Oil or NE-90 See October 12, 2010 Narrative Responses 0.5 to 1 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Nalco 

Gelled Water for Openhole Wells- Oil or 

Gas

Unigel 19XL See October 12, 2010 Narrative Responses 5 to 20 lb per 1000 gal See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Hercules Incorpora

Gelled Water for Unigel 5F See October 12, 2010 5 to 20 lb per 1000 gal See October 12, 2010 See October 12, 2010 Hercules Incorpora

Rationale for Site 

Requirements CBI?

Table 4. Formulation/Mixture Specifications

CBI? CBI? Specifications to Meet Site Requirements Formulation/Mixture Name Constituent

Quantity of Constituent 

used in Hydraulic 

Fracturing (please 

specify units)

Concentration of 

Constituent as Injected 

(please indicate units)

CBI? CBI?

Manufacturer 

Product and/o

Constituents

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

Yes

No

Yes

No

Yes

No

Yes

No

YesYesYesYes

YesYesYesYes

YesYesYesYes

YesYesYesYes

Gelled Water for Openhole Wells- Oil or Unigel 5F See October 12, 2010 Narrative Responses 5 to 20 lb per 1000 gal See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Hercules Incorpora

Gelled Water for Openhole Wells- Oil or ICA-1 See October 12, 2010 Narrative Responses 1 to 10 lb per 1000 gal See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Enginee

Chemistry 

Gelled Water for Openhole Wells- Oil or 

Gas

LEB-10X See October 12, 2010 Narrative Responses 0.05 to 0.2 qt per 1000 gal See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Enginee

Chemistry 

Gelled Water for 

Openhole Wells- Oil or GBL-8X See October 12, 2010 Narrative Responses 0.05 to 0.2 qt per 1000 gal See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses CESI Chemical 

Gelled Water for Openhole Wells- Oil or Benzoic Acid Flakes See October 12, 2010 Narrative Responses 25 to 100 lb per stage See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Enginee

Chemistry 

Gelled Water for Openhole Wells- Oil or 

Gas

API Frac Sand See October 12, 2010 Narrative Responses 0.25 to 3 lb per gallon See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Various 

Gelled Water for Openhole Wells- Oil or 0Gelled Water for Openhole Wells- Oil or 0Gelled Water for Openhole Wells- Oil or 

Gas

0

High Volume 

Gelled Water for Openhole Wells- Oil or Gas

Refer to response provided under "Range of Total Fluid Injected"

See October 12, 2010 Narrative Responses

See October 12, 2010 Narrative Responses

5,000 to 10,000 gal per stage; 5 to 30 stages per well

See October 12, 2010 Narrative Responses

See October 12, 2Question 3 Adden

Formulation/Mixture 

Name

Quantity of Water 

Used 

(gallons)

Incoming Water 

Source Quality of Water

Table 5. Formulation/Mixture/Water Specifications

Range of Total Fluid 

Injected 

(Low to High)

(gallons)

Average Volume of 

Total Fluid Injected 

(gallons)

CBI? CBI? CBI? CBI?

CBI?

Geological Factor

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

Yes Yes Yes Yes Yes 

Yes

No

Yes

No

Yes

No

Yes

No

YesYesYesYes

YesYesYesYes

YesYesYesYes

YesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

Yes Yes Yes Yes Yes 

Yes

No

Yes

No

Yes

No

Yes

No

YesYesYesYes

YesYesYesYes

YesYesYesYes

YesYesYesYes
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

Gelled Water for Shallow Gas Wells with Nitrogen Assist

Formulation/ Mixture 

Name

Chemical Name (Use 

IUPAC 

Nomenclature)

CBI? Chemical Formula CBI? Chemical Abstract System (CAS) Number CBI? Purpose of Chemical in Hydraulic Fracturing Fluid Formulation/Mixture CBI? Concentration as Delivered to Site (please indicate units) CBI? How was t

Concentrat

Determine

Gelled Water for Shallow Gas Wells with Nitrogen Assist

Unigel 19XL guar gum None Available > 95% 

Gelled Water for Shallow Gas Wells with Nitrogen Assist

Unigel 5F guar gum None Available > 95% 

Gelled Water for Shallow Gas Wells with Nitrogen Assist

Unigel 2XL guar gum None Available > 95% 

Gelled Water for Shallow Gas Wells with Nitrogen Assist

Unigel 1XLR hydroxypropyl guar 39421-75-5 > 95% 

Gelled Water for 

Shallow Gas Wells with FRP-121 None Available None Available None Available 

Table 1. Chemical Constituents

Hydraulic Fracturing 

FORMULATION / MIXTURE SPECIFIC QUESTIONS

Please provide information on all constituents in the formulation/mixture. If Material Safety Data Sheets (MSDSs) are available, please attach them to your submittal. Formulation/Mixture Name:

CalculatedCalculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

SelectSelectSelectSelectSelect

Analytically

YesYesYesYesYes

YesYesYesYesYes

YesYesYesYesYes

YesYesYesYesYes

YesYesYesYesYes

YesYesYesYesYes

YesYesYesYesYes

YesYesYesYesYes

YesYesYesYesYes

YesYesYesYesYes

YesYesYesYesYes

YesYesYesYesYes

YesYesYesYesYes

YesYesYesYes

YesYesYesYes

YesYesYesYes

Gelling agentGelling agentGelling agentGelling agentFriction reducer

Shallow Gas Wells with Nitrogen Assist

FRP-121 None Available None Available None Available 

Gelled Water for Shallow Gas Wells with Nitrogen Assist

Nitrogen Nitrogen 7727-37-9

Gas Fracturing Fluid

100% 

Gelled Water for Shallow Gas Wells with Nitrogen Assist

SuperSurf methanol 67-56-1 30-60% 

Gelled Water for Shallow Gas Wells with Nitrogen Assist

Iron Sta IIC ethylene glycol 107-21-1 10-30% 

Gelled Water for Shallow Gas Wells with Nitrogen Assist

Cla-Chek LP ethylene glycol 107-21-1 30-60% 

Gelled Water for Shallow Gas Wells with Nitrogen Assist

Flomax 50 (CESI) isopropanol, citrus terpenes 67-63-0, 94266-47-4 1-15%, 1-15% 

Gelled Water for Shallow Gas Wells with Nitrogen Assist

Flomax 50 (clearwater)

alcohol ethoxylated (C8 C10 4.5 mol), isopropyl alcohol, ethylene glycol

68439-45-2, 67-63-0, 107-21-1 10-30%, 10-30%, 7-13% 

Gelled Water for Shallow Gas Wells with Nitrogen Assist

GBL-8X None Available None Available None Available 

Gelled Water for Shallow Gas Wells with Nitrogen Assist

LEB-10X ethylene glycol 107-21-1 30-60% 

Gelled Water for 

CalculatedCalculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

SelectSelectSelectSelectSelectSelectSelect

Analytically

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

SelectSelectSelectSelectSelectSelect

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYes

YesYesYesYesYes

YesYesYesYesYes

YesYesYesYesYes

YesYesYesYes

YesYesYesYes

YesYesYesYes

Yes Yes Yes YesYesYesYesYesYes Yes

YesYesYesYes Yes

YesYesYesYes Yes

YesYesYesYes

Yes Yes Yes YesYes Yes Yes YesYes Yes Yes YesYes Yes Yes YesYes Yes Yes YesYes Yes Yes YesYes Yes Yes Yes

Gelling agentGelling agentGelling agentGelling agentFriction reducerOther, specify:SurfactantIron controlClay controlSurfactantBreaker fluidBreaker fluidSurfactant

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Surfactant

Yes YesYes YesYes YesYes YesYes YesYes Yes

Gelled Water for Shallow Gas Wells with Nitrogen Assist

Uniflo Isopropyl alcohol 67-63-0 40-70% 

CalculatedCalculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

SelectSelectSelectSelectSelectSelectSelect

Analytically

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

SelectSelectSelectSelectSelectSelect

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYes

YesYesYesYesYes

YesYesYesYesYes

YesYesYesYesYes

YesYesYesYes

YesYesYesYes

YesYesYesYes

Yes Yes Yes YesYesYesYesYesYes Yes

YesYesYesYes Yes

YesYesYesYes Yes

YesYesYesYes

Yes Yes Yes YesYes Yes Yes YesYes Yes Yes YesYes Yes Yes YesYes Yes Yes YesYes Yes Yes YesYes Yes Yes Yes

Gelling agentGelling agentGelling agentGelling agentFriction reducerOther, specify:SurfactantIron controlClay controlSurfactantBreaker fluidBreaker fluidSurfactant

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Surfactant

Yes YesYes YesYes YesYes YesYes YesYes Yes
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

Gelled Water for Shallow Gas Wells with Nitrogen Assist

Bioclear 1000 2,2-dibromo-3- nitrilopropionamide 10222-01-2 97.6% 

Gelled Water for Shallow Gas Wells with Nitrogen Assist

API Frac Sand

crystalline silica (quartz), aluminum oxide, iron oxide, titanium oxide

14808-60-7, 1344-28-1, 1309-37-1, 13463-67-7

99.0-99.9%, <0.8%, <0.1%, <0.1% 

Formulation/Mixture 

Name Chemical Name CBI? 

Gelled Water for Shallow Gas Wells with Nitrogen Assist

Unigel 19XL 

Gelled Water for Shallow Gas Wells with 

Nitrogen Assist

Unigel 5F 

Gelled Water for Shallow Gas Wells with 

Nitrogen Assist

Unigel 2XL 

Gelled Water for Shallow Gas Wells with 

Nitrogen Assist

Unigel 1XLR 

Gelled Water for Shallow Gas Wells with 

Nitrogen Assist

FRP-121 

Gelled Water for Shallow Gas Wells with Nitrogen Assist

Nitrogen 

Gelled Water for SuperSurf None Available 

None AvailableNone Available28.02

None AvailableNone Available

None Available

None AvailableNone Available

None AvailableNone Available

None Available None Available

None Available

None AvailableNone Available

Distribution Coefficient Kd 

(L kg-1)

KH (acceptable units atm L mol1 or bar L mol-1 or Pa L mol-1 or 

atm m3 mol-1 or bar m3 mol-1 or 

Pa m3 mol-1) 

None Available

Organic Carbon-Water Partition 

Coefficient KOC 

(L kg-1)

Octanol- Water Partition 

Coefficient Kow

None Available None Available

None Available

None Available

None AvailableNone AvailableNone AvailableNone Available

None Available

None AvailableNone AvailableNone Available

None AvailableNone AvailableNone Available

None Available

None Available

None Available

Table 2. Chemical and Physical Properties of Chemical Constituents Please provide the chemical and physical properties of the chemical constituents listed in Table 1 above.

Molar 

(g m

YesYesYesYesYesYesYes

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Proppant Calculated

Analytically

Yes Yes Yes Yes Yes 

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Biocide Calculated

Analytically

Yes Yes Yes Yes 

Gelled Water for Shallow Gas Wells with Nitrogen Assist

SuperSurf 

Gelled Water for Shallow Gas Wells with Nitrogen Assist

Iron Sta IIC 

Gelled Water for Shallow Gas Wells with 

Nitrogen Assist

Cla-Chek LP 

Gelled Water for Shallow Gas Wells with 

Nitrogen Assist

Flomax 50 (CESI) 

Gelled Water for Shallow Gas Wells with 

Nitrogen Assist

Flomax 50 (clearwater)

Gelled Water for Shallow Gas Wells with 

Nitrogen Assist

GBL-8X 

Gelled Water for Shallow Gas Wells with 

Nitrogen Assist

LEB-10X 

Gelled Water for Shallow Gas Wells with 

Nitrogen Assist

Uniflo 

Gelled Water for Shallow Gas Wells with Nitrogen Assist

Bioclear 1000 

Gelled Water for Shallow Gas Wells with 

Nitrogen Assist

API Frac Sand 

None Available None Available None Available None Available None Available None Available None Available

None Available None Available None Available

None Available None Available None Available None Available None Available None Available None Available None Available None Available None Available 

None Available 

None Available None Available None Available None Available None Available None Available None Available None Available None Available

None Available None Available None Available None Available None Available None Available 

None Available None Available None Available None Available None Available

None Available None Available 

None Available

None Available None Available

None Available

None Available

None Available

None Available

YesYesYesYesYesYesYesYesYesYesYesYesYes

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Proppant Calculated

Analytically

Yes Yes Yes Yes Yes 

Yes

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Biocide Calculated

Analytically

Yes Yes Yes Yes 

YesYes
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

Formulation/Mixture 

Name Proppant Name CBI? Proppant Specifications CBI? Is the Proppant Resin Coated? CBI? Specify the Resin Coating Materials Used CBI?

Gelled Water for Shallow Gas Wells with Nitrogen Assist

API Frac Sand 10/20 down to 70/140 mesh Not Applicable

Gelled Water for Shallow Gas Wells with Nitrogen AssistGelled Water for Shallow Gas Wells with Nitrogen AssistGelled Water for Shallow Gas Wells with Nitrogen AssistGelled Water for Shallow Gas Wells with Nitrogen AssistGelled Water for Shallow Gas Wells with Nitrogen AssistGelled Water for Shallow Gas Wells with Nitrogen AssistTable 3. Proppant Constituents Please provide the chemical and physical properties of the proppants listed in Table 1 above.

YesYes

No

Yes

No

Yes

No

Yes

No

Yes

No

Yes

NoNo

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

Yes
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

Gelled Water for Shallow Gas Wells with Unigel 19XL See October 12, 2010 Narrative Responses 10 to 30 lb/1000 gallons See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Hercules Incorpo

Gelled Water for 

Shallow Gas Wells with Unigel 5F See October 12, 2010 Narrative Responses 10 to 30 lb/1000 gallons See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Hercules Incorpo

Gelled Water for 

Shallow Gas Wells with Unigel 2XL See October 12, 2010 Narrative Responses 10 to 30 lb/1000 gallons See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Hercules Incorpo

Gelled Water for 

Shallow Gas Wells with Unigel 1XLR See October 12, 2010 Narrative Responses 10 to 30 lb/1000 gallons See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Hercules Incorpo

Gelled Water for Shallow Gas Wells with 

Nitrogen Assist

FRP-121 See October 12, 2010 Narrative Responses 3 to 7 lb/1000 gallons See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses SNF INC 

Gelled Water for 

Shallow Gas Wells with Nitrogen See October 12, 2010 Narrative Responses 50000 to 100000 scf See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Various Gelled Water for Shallow Gas Wells with SuperSurf See October 12, 2010 Narrative Responses 0.5 to 1 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Gelled Water for Shallow Gas Wells with 

Nitrogen Assist

Iron Sta IIC See October 12, 2010 Narrative Responses 0.5 to 2 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Gelled Water for 

Shallow Gas Wells with Cla-Chek LP See October 12, 2010 Narrative Responses 0.5 to 2 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Gelled Water for 

Shallow Gas Wells with Flomax 50 (CESI) See October 12, 2010 Narrative Responses 2 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses CESI Chemical 

Gelled Water for 

Shallow Gas Wells with 

Flomax 50 (clearwater)

See October 12, 2010 Narrative Responses

2 gpt See October 12, 2010 

Narrative Responses

See October 12, 2010 Narrative Responses

Clearwater EnginChemistry 

CBI? CBI?

Table 4. Formulation/Mixture Specifications

Rationale for Site 

Requirements

Manufacture

Product and

Constituen

CBI? CBI? 

Specifications to Meet Site 

Requirements

Formulation/Mixture 

Name Constituent

Quantity of Constituent 

used in Hydraulic 

Fracturing (please 

specify units)

Concentration of 

Constituent as Injected 

(please indicate units)

CBI?

YesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYes

Yes Yes Yes Yes Yes 

Shallow Gas Wells with (clearwater) Narrative Responses Narrative Responses Narrative Responses Chemistry Gelled Water for Shallow Gas Wells with Nitrogen Assist

GBL-8X See October 12, 2010 Narrative Responses 0.05 to 0.2 qt / 1000 gallons See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses CESI Chemical 

Gelled Water for Shallow Gas Wells with LEB-10X See October 12, 2010 Narrative Responses 0.05 to 0.2 qt / 1000 gallons See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Gelled Water for Shallow Gas Wells with Uniflo See October 12, 2010 Narrative Responses 0.5 to 1 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Gelled Water for Shallow Gas Wells with Bioclear 1000 See October 12, 2010 Narrative Responses 2 lb / 500 bbl See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Gelled Water for Shallow Gas Wells with 

Nitrogen Assist

API Frac Sand See October 12, 2010 Narrative Responses 0.5 to 4 lb per gallon See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Various 

High Volum

Gelled Water for Shallow Gas Wells with Nitrogen Assist

Refer to response provided under "Range of Total Fluid Injected"

See October 12, 2010 Narrative Responses

See October 12, 2010 Narrative Responses

5,000 to 50,000 gal per stage; 1 to 2 stages per well

See October 12, 2010 Narrative Responses

See October 12Question 3 Adde

CBI?

Geological Facto

Table 5. Formulation/Mixture/Water Specifications

Formulation/Mixture 

Name

Quantity of Water 

Used 

(gallons)

Incoming Water 

Source Quality of Water

Range of Total Fluid 

Injected 

(Low to High)

(gallons)

Average Volume of 

Total Fluid Injected 

(gallons)

CBI? CBI? CBI? CBI?

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

Yes Yes Yes Yes Yes 

YesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYes

Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes 
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

Foam 

Formulation/ Mixture 

Name

Chemical Name (Use 

IUPAC 

Nomenclature)

CBI? Chemical Formula CBI? Chemical Abstract System (CAS) Number CBI? Purpose of Chemical in Hydraulic Fracturing Fluid Formulation/Mixture CBI? Concentration as Delivered to Site (please indicate units) CBI? How was t

Concentrat

Determine

Foam Unigel 19XL guar gum None Available > 95% 

Foam Unigel 5F guar gum None Available > 95% 

Foam Unigel 2XL guar gum None Available > 95% 

Foam Unigel 1XLR hydroxypropyl guar 39421-75-5 > 95% 

Foam FRP-121 None Available None Available None Available 

FORMULATION / MIXTURE SPECIFIC QUESTIONS

Please provide information on all constituents in the formulation/mixture. If Material Safety Data Sheets (MSDSs) are available, please attach them to your submittal. 

Hydraulic Fracturing

Formulation/Mixture Name:Table 1. Chemical Constituents

CalculatedCalculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

SelectSelectSelectSelectSelectSelect

Analytically

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYes

YesYesYesYes

YesYesYesYes

Gelling agentGelling agentGelling agentGelling agentFriction reducerOther, specify:

Foam Nitrogen Nitrogen 7727-37-9

Gas Fracturing Fluid

100% 

Foam Unifoam Glycol Ethers 111-76-2 15-40% 

Foam SuperSurf methanol 67-56-1 30-60% 

Foam Flomax 50 (CESI) isopropanol, citrus terpenes 67-63-0, 94266-47-4 1-15%, 1-15% 

Foam Flomax 50 (Clearwater) alcohol ethoxylated (C8 C10 4.5 mol), isopropyl alcohol, ethylene glycol 68439-45-2, 67-63-0, 107- 21-1 10-30%, 10-30%, 7-13% 

Foam NCL ethylene glycol 107-21-1 30-60% 

Foam LEB-10X ethylene glycol 107-21-1 30-60% 

Foam Bioclear 1000 2,2-dibromo-3- nitrilopropionamide 10222-01-2 97.6% 

Foam NE-90

Methanol, Isopropanol, Heavy Aromatic naphtha, Polyethylene 

Glycol, EO-C7-9-iso, C8 

67-56-1, 67-63-0, 64742-94-5, 25322-68-3, 78330-19-5, 78330-20-8, 104-76-7, 91-20-3

Non-Emulsifier

30-60%, 1-5%, 1-5%, 5-10%, 1-5%, 1-5%, 5-10%, 0.1-1%

CalculatedCalculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

SelectSelectSelectSelectSelectSelectSelect

Analytically

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

CalculatedCalculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

SelectSelectSelectSelectSelectSelect

Analytically

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

Yes Yes Yes YesYesYesYesYesYes Yes

YesYesYesYes Yes

YesYesYesYes

YesYesYesYesYes

YesYesYesYes

YesYesYesYes

YesYesYesYes

Yes Yes YesYes Yes Yes

Yes Yes Yes Yes

Yes Yes Yes

Gelling agentGelling agentGelling agentGelling agentFriction reducerOther, specify:Foaming agentSurfactantSurfactantClay controlBreaker fluidBiocideOther, specify:

Calculated

Analytically

Yes Yes Yes Yes 

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Surfactant

Yes YesYes YesYes YesYes YesYes YesYes YesYes YesYes Yes

naphtha, Polyethylene Glycol, EO-C7-9-iso, C8 

19-5, 78330-20-8, 104-76-7, 91-20-3

Non-Emulsifier 10%, 0.1-1%

CalculatedCalculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

SelectSelectSelectSelectSelectSelectSelect

Analytically

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

CalculatedCalculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

SelectSelectSelectSelectSelectSelect

Analytically

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

Yes Yes Yes YesYesYesYesYesYes Yes

YesYesYesYes Yes

YesYesYesYes

YesYesYesYesYes

YesYesYesYes

YesYesYesYes

YesYesYesYes

Yes Yes YesYes Yes Yes

Yes Yes Yes Yes

Yes Yes Yes

Gelling agentGelling agentGelling agentGelling agentFriction reducerOther, specify:Foaming agentSurfactantSurfactantClay controlBreaker fluidBiocideOther, specify:

Calculated

Analytically

Yes Yes Yes Yes 

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Surfactant

Yes YesYes YesYes YesYes YesYes YesYes YesYes YesYes Yes
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

Foam GBL-8X None Available None Available None Available 

Foam NE - 50 Isopropyl alcohol, Methanol 67-63-0, 67-56-1

Non-Emulsifier

30-60%, 10-30% 

Gelled Water for Shallow Gas Wells with Nitrogen Assist

API Frac Sand

crystalline silica (quartz), aluminum oxide, iron oxide, titanium oxide

14808-60-7, 1344-28-1, 1309-37-1, 13463-67-7

99.0-99.9%, <0.8%, <0.1%, <0.1% 

Gelled Water for Shallow Gas Wells with Nitrogen Assist

Transfoam isopropyl alcohol, glycol ethers 67-63-0, 111-76-2 15-40%, 3-7% 

Gelled Water Frac for Shallow Gas Wells with Nitrogen Assist

Carbon Dioxide Carbon Dioxide 124-38-9

Other: Gas Fracturing Fluid

> 99% 

Formulation/Mixture 

Name Chemical Name CBI? 

Foam 

Unigel 19XL 

Foam Unigel 5F 

Octanol- Water Partition 

Coefficient Kow

None Available

Table 2. Chemical and Physical Properties of Chemical Constituents Please provide the chemical and physical properties of the chemical constituents listed in Table 1 above.

Molar 

(g m

None AvailableNone Available

KH (acceptable units atm L mol1 or bar L mol-1 or Pa L mol-1 or 

atm m3 mol-1 or bar m3 mol-1 or 

Pa m3 mol-1) 

Organic Carbon-Water Partition 

Coefficient KOC 

(L kg-1)

None Available

None Available None Available

None AvailableNone Available

Distribution Coefficient Kd 

(L kg-1)

None AvailableNone Available

YesYes

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Calculated

Analytically

Select

Yes Yes Yes Yes Yes Yes Yes Yes YesYes Yes Yes Yes

Breaker fluidSurfactant Select Other, specify:

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Proppant Calculated

Analytically

Yes Yes Yes Yes Yes 

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Foaming agent Calculated

Analytically

Yes Yes Yes Yes Yes 

Calculated

Analytically

Yes Yes Yes Yes Yes 

Calculated

Analytically

Yes Yes Yes Yes Yes 

Calculated

Analytically

Yes Yes Yes Yes Yes 

Calculated

Analytically

Yes Yes Yes Yes Yes 

Foam 

Unigel 2XL 

Foam 

Unigel 1XLR 

Foam 

FRP-121 

Foam Nitrogen Foam 

Unifoam 

Foam 

SuperSurf 

Foam Flomax 50 (CESI) 

Foam 

Flomax 50 (Clearwater)

Foam 

NCL None Available None Available None Available None Available None Available 

Foam 

LEB-10X 

Foam 

Bioclear 1000 None Available None Available None Available 

None Available

None AvailableNone Available None Available None Available None Available

None Available

None Available None Available None Available

None Available None AvailableNone Available

None Available None Available None AvailableNone AvailableNone Available None Available None Available None AvailableNone AvailableNone AvailableNone Available

None Available

None Available None Available None Available 

None AvailableNone AvailableNone Available

None Available

None Available None AvailableNone Available None Available

None AvailableNone AvailableNone Available

None Available None Available

None AvailableNone Available None Available

None Available28.02None Available

YesYesYesYesYesYesYes

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

YesYesYesYesYes

Yes Yes Yes YesYes Yes Yes Yes

Breaker fluidSurfactant Select Other, specify:

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Proppant Calculated

Analytically

Yes Yes Yes Yes Yes 

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Calculated

Analytically

Select

Yes Yes Yes Yes Yes 

Foaming agent Calculated

Analytically

Yes Yes Yes Yes Yes 

Yes

Calculated

Analytically

Yes Yes Yes Yes Yes 

Calculated

Analytically

Yes Yes Yes Yes Yes 

Calculated

Analytically

Yes Yes Yes Yes Yes 

Calculated

Analytically

Yes Yes Yes Yes Yes 
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

Foam 

NE-90 None Available None Available None Available None Available None Available 

Foam 

GBL-8X 

Foam 

NE - 50 

Foam 

API Frac Sand 

Foam 

Transfoam 

Foam Fracs

Carbon Dioxide 

Formulation/Mixture 

Name Proppant Name CBI? Proppant Specifications CBI? Is the Proppant Resin Coated? CBI? Specify the Resin Coating Materials Used CBI?

Foam API Frac Sand 10/20 down to 70/140 mesh Not Applicable

Foam Foam Foam 

None Available None Available

None AvailableNone Available

None Available None Available None AvailableNone Available None Available 

None Available None Available None Available None Available None Available None Available None Available None Available None Available

Table 3. Proppant Constituents Please provide the chemical and physical properties of the proppants listed in Table 1 above.

None Available 

None Available 

None Available None Available None Available None Available 44.01 

YesYes

No

Yes

No

Yes

NoNo

YesYesYesYes

YesYesYesYes

YesYesYesYes

YesYesYesYes

YesYesYes

Yes

No

Yes Yes

YesYesYes

Foam Foam Foam 

YesYes

No

Yes

No

Yes

No

Yes

No

Yes

No

Yes

NoNo

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYes

Yes

No

Yes Yes

YesYesYes
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

Foam Unigel 19XL See October 12, 2010 Narrative Responses 15 to 30 lb/1000 gal See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Hercules Incorpo

Foam Unigel 5F See October 12, 2010 Narrative Responses 15 to 30 lb/1000 gal See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Hercules IncorpoFoam Unigel 2XL See October 12, 2010 Narrative Responses 15 to 30 lb/1000 gal See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Hercules IncorpoFoam Unigel 1XLR See October 12, 2010 Narrative Responses 15 to 30 lb/1000 gal See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Hercules IncorpoFoam FRP-121 See October 12, 2010 Narrative Responses 3 to 7 lb/1000 gal See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses SNF INC 

Foam Nitrogen See October 12, 2010 Narrative Responses 200,000 to 2,000,000 scf/stage See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Various 

Foam Unifoam See October 12, 2010 Narrative Responses 3 to 5 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Foam SuperSurf See October 12, 2010 Narrative Responses 5 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Foam Flomax 50 (CESI) See October 12, 2010 Narrative Responses 2 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses CESI Chemical 

Foam Flomax 50 (Clearwater) See October 12, 2010 Narrative Responses 2 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Foam NCL See October 12, 2010 Narrative Responses 2 to 3 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

CBI? CBI? CBI? CBI? CBI? Specifications to Meet Site Requirements

Table 4. Formulation/Mixture Specifications

Rationale for Site 

Requirements

Manufacture

Product and

Constituen

Formulation/Mixture 

Name Constituent

Quantity of Constituent 

used in Hydraulic 

Fracturing (please 

specify units)

Concentration of 

Constituent as Injected 

(please indicate units)

YesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYes

Yes Yes Yes Yes Yes 

Narrative Responses Narrative Responses Narrative Responses Chemistry

Foam LEB-10X See October 12, 2010 Narrative Responses 0.05 to 0.2 qt/1000 gal See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Foam Bioclear 1000 See October 12, 2010 Narrative Responses 2 lb / 500 bbl See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Foam NE-90 See October 12, 2010 Narrative Responses 0.5 to 1 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Nalco 

Foam GBL-8X See October 12, 2010 Narrative Responses 0.05 to 0.2 qt/1000 gal See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses CESI Chemical 

Foam NE - 50 See October 12, 2010 Narrative Responses 0.5 to 1 gpt/1000 gal See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Foam API Frac Sand See October 12, 2010 Narrative Responses 0.5 to 5 lb per gallon See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Various 

Foam Transfoam See October 12, 2010 Narrative Responses 5 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Foam Fracs Carbon Dioxide See October 12, 2010 Narrative Responses 80 to 160 tons per job See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Various 

High Volum

Quantity of Water 

Used 

(gallons)

Incoming Water 

Source Quality of Water

Table 5. Formulation/Mixture/Water Specifications

Range of Total Fluid 

Injected 

(Low to High)

(gallons)

Average Volume of 

Total Fluid Injected 

(gallons)

CBI? CBI? CBI? CBI? Formulation/Mixture Name

CBI?

Geological Facto

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

Yes Yes Yes Yes Yes 

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYes Yes Yes Yes YesYesYes

Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes 

Yes Yes Yes Yes Yes Yes Yes Yes 

Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes 
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

Foam 

Refer to response provided under "Range of Total Fluid Injected"

See October 12, 2010 Narrative Responses

See October 12, 2010 Narrative Responses

5,000 to 30,000 gal per stage; 1 to 5 stages per well

See October 12, 2010 Narrative Responses

See October 12Question 3 Adde

Yes Yes Yes Yes Yes 
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

Acid 

Formulation/ Mixture 

Name

Chemical Name (Use 

IUPAC 

Nomenclature)

CBI? Chemical Formula CBI? Chemical Abstract System (CAS) Number CBI? Purpose of Chemical in Hydraulic Fracturing Fluid Formulation/Mixture CBI? Concentration as Delivered to Site (please indicate units) CBI? How was t

Concentrat

Determine

Acid AGA-150 Isopropyl Alcohol 67-63-0 40-70% 

Acid Acid Pensurf

2-Ethylhexanol, Dodecylbenzenesulfonate isopropanolamine

104-76-7, 42504-46-1 40-70%, 30-60% 

Acid ABF Salt Ammonium Biflouride, Ammonium Fluoride 1341-49-7, 12125-01-8 > 94%, 4% 

Acid HCL Acid Hydrochloric Acid 7647-01-0 32% to 3% 

Acid Acetic Acid Acetic Acid 64-19-7 20% to 5% 

FORMULATION / MIXTURE SPECIFIC QUESTIONS

Please provide information on all constituents in the formulation/mixture. If Material Safety Data Sheets (MSDSs) are available, please attach them to your submittal. Formulation/Mixture Name:

Hydraulic Fracturing

Table 1. Chemical Constituents

CalculatedCalculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

SelectSelectSelectSelectSelectSelect

Analytically

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

Yes Yes YesYes Yes YesYes Yes YesYes Yes Yes

Viscosifier

Surfactant

Acid treatment SelectAcid treatment SelectAcid treatment Select

Select Iron control

Acid Iron Chek hydroxyacetic acid, Methyl Alcohol 79-14-1, 67-56-1 30-60%, 15-40% 

Acid Iron Sta IIC ethylene glycol 107-21-1 10-30% 

Acid AR-1 Isopropyl Alcohol 67-63-0

Acid Retarder

30-60% 

Acid Unihib A ######################

67-56-1, 68002-97-1, Proprietary, 64741-68-0, 64742-95-6, Proprietary, 8008-20-6, 64742-47-8, 

10-30%, 10-30%, 5-10%, 5-10%, 5-10%, 1-5%, 1-5%, 1-5%, 1-5%, 1-5%, 1-5%, 0.1-1%, 0.1-

Acid Unihib O Ethylene Glycol, Isopropyl alcohol 107-21-1, 67-63-0 65-100%, 3-7% 

Acid Unihib 250 Propargyl Alcohol, Glycol Ethers, Isopropyl alcohol 107-19-7, 111-76-2, 67-63- 0 15-40%, 15-40%, 15- 40% 

CalculatedCalculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

SelectSelectSelectSelectSelectSelectSelect

Analytically

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

SelectSelectSelectSelect

YesYesYesYes

YesYesYesYes

YesYesYesYes

YesYesYesYes

YesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

Yes Yes Yes YesYesYesYes Yes

YesYes Yes

YesYes Yes

YesYes

Yes Yes YesYes Yes YesYes Yes YesYes Yes YesYes Yes YesYes Yes YesYes Yes Yes

Viscosifier

Surfactant

Acid treatment SelectAcid treatment SelectAcid treatment Select

Select Iron controlSelect Iron controlSelect Other, specify:Select Corrosion inhibitorSelect Corrosion inhibitorSelect Corrosion inhibitor
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

Formulation/Mixture 

Name Chemical Name CBI? 

Acid 

AGA-150 

Acid 

Acid Pensurf 

Acid 

ABF Salt 

Acid 

HCL Acid 

Acid 

Acetic Acid 

Acid 

Iron Chek 

Acid 

Iron Sta IIC 

Acid 

AR-1 None Available None Available None Available None Available None Available 

Acid 

Unihib A 

None AvailableNone Available

None Available None AvailableNone Available

None Available

None AvailableNone AvailableNone Available

None Available None Available

None AvailableNone AvailableNone Available None Available None Available

Octanol- Water Partition 

Coefficient Kow

None Available

KH (acceptable units atm L mol1 or bar L mol-1 or Pa L mol-1 or 

atm m3 mol-1 or bar m3 mol-1 or 

Pa m3 mol-1) 

None Available

None Available

None Available None Available

Distribution Coefficient Kd 

(L kg-1)

None Available None Available

None Available

None Available

Molar 

(g m

Organic Carbon-Water Partition 

Coefficient KOC 

(L kg-1)

Table 2. Chemical and Physical Properties of Chemical Constituents Please provide the chemical and physical properties of the chemical constituents listed in Table 1 above.

None Available

None AvailableNone AvailableNone Available 

None Available

None Available None AvailableNone Available

None AvailableNone Available None Available

None AvailableNone AvailableNone Available None Available

YesYesYesYesYesYesYesYesYes

Acid 

Unihib O 

Acid 

Unihib 250 None Available None Available None Available None Available None Available 

Formulation/Mixture 

Name Proppant Name CBI? Proppant Specifications CBI? Is the Proppant Resin Coated? CBI? Specify the Resin Coating Materials Used CBI?

Acid Not ApplicableAcid Acid Acid Acid Acid 

Acid 

Table 3. Proppant Constituents Please provide the chemical and physical properties of the proppants listed in Table 1 above.

None Available None Available None Available None Available None Available

YesYes

No

Yes

No

Yes

No

Yes

No

Yes

No

Yes

NoNo

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYes

Acid 

YesYes

No

Yes

No

Yes

No

Yes

No

Yes

No

Yes

NoNo

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYes
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

Acid AGA-150 See October 12, 2010 Narrative Responses 20 to 40 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Acid Acid Pensurf See October 12, 2010 Narrative Responses 1 to 2 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Acid ABF Salt See October 12, 2010 Narrative Responses 400 lb per 1000 gallons to make 12/3 HCL/HF acid See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Solvay Fluorides 

Acid HCL Acid See October 12, 2010 Narrative Responses 3 to 32% See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Various 

Acid Acetic Acid See October 12, 2010 Narrative Responses 5 to 20% See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Acid Iron Chek See October 12, 2010 Narrative Responses 10 to 20 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Acid Iron Sta IIC See October 12, 2010 Narrative Responses 10 to 20 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Acid AR-1 See October 12, 2010 Narrative Responses 5 to 10 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Acid Unihib A See October 12, 2010 Narrative Responses 1 to 4 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Champion Techn

Acid Unihib O See October 12, 2010 Narrative Responses 1 to 4 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Acid Unihib 250 See October 12, 2010 Narrative Responses 1 to 4 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

CBI? CBI? CBI? Formulation/Mixture Name Constituent Rationale for Site Requirements CBI?

Quantity of Constituent 

used in Hydraulic 

Fracturing (please 

specify units)

Concentration of 

Constituent as Injected 

(please indicate units)

Manufacture

Product and

Constituen

Table 4. Formulation/Mixture Specifications

CBI? Specifications to Meet Site Requirements

YesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYes

Acid Unihib 250 Narrative Responses Narrative Responses Narrative Responses Chemistry Acid 0Acid 0Acid 0

High Volum

Acid 

Refer to response provided under "Range of Total Fluid Injected"

See October 12, 2010 Narrative Responses

See October 12, 2010 Narrative Responses

1,000 to 20,000 gal acid per stage; 1 to 5 stages per well

See October 12, 2010 Narrative Responses

See October 12Question 3 Adde

CBI?

Geological Facto

CBI? CBI? 

Range of Total Fluid 

Injected 

(Low to High)

(gallons)

Average Volume of 

Total Fluid Injected 

(gallons)

Table 5. Formulation/Mixture/Water Specifications

Formulation/Mixture 

Name

Quantity of Water 

Used 

(gallons)

Incoming Water 

Source CBI? CBI? Quality of Water

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

Yes Yes Yes Yes Yes 

YesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYes
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

Acid Breakdown

Formulation/ Mixture 

Name

Chemical Name (Use 

IUPAC 

Nomenclature)

CBI? Chemical Formula CBI? Chemical Abstract System (CAS) Number CBI? Purpose of Chemical in Hydraulic Fracturing Fluid Formulation/Mixture CBI? Concentration as Delivered to Site (please indicate units) CBI? How was t

Concentrat

Determine

Acid Breakdown HCL Acid Hydrochloric Acid 7647-01-0 32% to 3% 

Acid Breakdown Acetic Acid Acetic Acid 64-19-7 20% to 5% 

Acid Breakdown Acid Pensurf

2-Ethylhexanol, Dodecylbenzenesulfonate isopropanolamine

104-76-7, 42504-46-1 40-70%, 30-60% 

Acid Breakdown ABF Salt Ammonium Biflouride, Ammonium Fluoride 1341-49-7, 12125-01-8 > 94%, 4% 

Acid Breakdown Iron Sta IIC ethylene glycol 107-21-1 10-30% 

67-56-1, 68002-97-1, 10-30%, 10-30%, 5-

Table 1. Chemical Constituents

Hydraulic Fracturing 

FORMULATION / MIXTURE SPECIFIC QUESTIONS

Please provide information on all constituents in the formulation/mixture. If Material Safety Data Sheets (MSDSs) are available, please attach them to your submittal. Formulation/Mixture Name:

CalculatedCalculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

SelectSelectSelectSelectSelectSelect

Analytically

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

YesYesYesYesYesYes

Yes Yes

Acid treatmentAcid treatment

Surfactant

Acid treatment

Iron controlCorrosion inhibitor

Yes

Acid Breakdown Unihib A ###################

67-56-1, 68002-97-1, Proprietary, 64741-68-0, 64742-95-6, Proprietary, 8008-20-6, 64742-47-8, 

10-30%, 10-30%, 5-10%, 5-10%, 5-10%, 1-5%, 1-5%, 1-5%, 1-5%, 1-5%, 1-5%, 0.1-1%, 0.1-

Acid Breakdown Unihib O Ethylene Glycol, Isopropyl alcohol 107-21-1, 67-63-0 65-100%, 3-7% 

Acid Breakdown MRA isopropyl alcohol 67-63-0

non-emulsifier

15-40% 

Acid Breakdown Iron Chek hydroxyacetic acid, methyl alcohol 79-14-1, 67-56-1 30-60%, 15-40% 

CalculatedCalculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

Calculated

Analytically

SelectSelectSelectSelectSelectSelectSelect

Analytically

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

Yes Yes

Acid treatmentAcid treatment

Surfactant

Acid treatment

Iron controlCorrosion inhibitorCorrosion inhibitor

Calculated

Analytically

Calculated

Analytically

SelectSelect

YesYes

YesYes

YesYes

YesYes

YesYes

YesYes

YesYes

YesYes

YesYes

Iron controlOther, specify:

Yes
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

Formulation/Mixture 

Name Chemical Name CBI? 

Acid Breakdown

HCL Acid 

Acid Breakdown

Acetic Acid 

Acid Breakdown

Acid Pensurf 

Acid Breakdown

ABF Salt 

Acid Breakdown

Iron Sta IIC 

Acid Breakdown

Unihib A 

Acid Breakdown

Unihib O 

Acid Breakdown

MRA 

Acid Breakdown

Iron Chek 

Organic Carbon-Water Partition 

Coefficient KOC 

(L kg-1)

None Available

Table 2. Chemical and Physical Properties of Chemical Constituents Please provide the chemical and physical properties of the chemical constituents listed in Table 1 above.

None Available

Octanol- Water Partition 

Coefficient Kow

None AvailableNone Available

None AvailableNone AvailableNone Available

None AvailableNone AvailableNone Available None Available None AvailableNone Available None Available None Available

None Available None Available None Available None Available 

None Available

None Available

None AvailableNone Available

None Available

None Available

KH (acceptable units atm L mol1 or bar L mol-1 or Pa L mol-1 or 

atm m3 mol-1 or bar m3 mol-1 or 

Pa m3 mol-1) 

None Available

None Available None Available 

None AvailableNone AvailableNone Available

Molar 

(g m

None Available

None AvailableNone Available

Distribution Coefficient Kd 

(L kg-1)

None AvailableNone AvailableNone Available

None AvailableNone AvailableNone Available

None AvailableNone AvailableNone Available

None AvailableNone Available

YesYesYesYesYesYesYesYesYes

Formulation/Mixture 

Name Proppant Name CBI? Proppant Specifications CBI? Is the Proppant Resin Coated? CBI? Specify the Resin Coating Materials Used CBI?

Acid Breakdown Not ApplicableAcid BreakdownAcid BreakdownAcid BreakdownAcid BreakdownAcid BreakdownAcid BreakdownTable 3. Proppant Constituents Please provide the chemical and physical properties of the proppants listed in Table 1 above.

YesYes

No

Yes

No

Yes

No

Yes

No

Yes

No

Yes

NoNo

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYes
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

Acid Breakdown HCL Acid See October 12, 2010 Narrative Responses 3 to 32% See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Various Acid Breakdown Acetic Acid See October 12, 2010 Narrative Responses 5 to 20% See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Acid Breakdown Acid Pensurf See October 12, 2010 Narrative Responses 1 to 2 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Acid Breakdown ABF Salt See October 12, 2010 Narrative Responses 400#/1000 gal for 12/3 HCL/HF Acid See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Solvay Fluorides 

Acid Breakdown Iron Sta IIC See October 12, 2010 Narrative Responses 10 to 20 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Acid Breakdown Unihib A See October 12, 2010 Narrative Responses 1 to 4 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Champion Techn

Acid Breakdown Unihib O See October 12, 2010 Narrative Responses 1 to 4 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Acid Breakdown MRA See October 12, 2010 Narrative Responses 30 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Acid Breakdown Iron Chek See October 12, 2010 Narrative Responses 10 to 20 gpt See October 12, 2010 Narrative Responses See October 12, 2010 Narrative Responses Clearwater Engin

Chemistry 

Acid Breakdown 0Acid Breakdown 0

CBI? CBI? Formulation/Mixture Name Constituent

Quantity of Constituent 

used in Hydraulic 

Fracturing (please 

specify units)

Concentration of 

Constituent as Injected 

(please indicate units)

Specifications to Meet Site 

Requirements

Rationale for Site 

Requirements

Manufacture

Product and

Constituen

CBI? CBI? CBI?

Table 4. Formulation/Mixture Specifications

YesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

Acid Breakdown 0Acid Breakdown 0Acid Breakdown 0Acid Breakdown 0

High Volum

Acid Breakdown

Refer to response provided under "Range of Total Fluid Injected"

See October 12, 2010 Narrative Responses

See October 12, 2010 Narrative Responses

350 to 5,000 gal of acid per stage; 1 to 16 stages per well

See October 12, 2010 Narrative Responses

See October 12Question 3 Adde

Formulation/Mixture 

Name

Quantity of Water 

Used 

(gallons)

Incoming Water 

Source Quality of Water

Range of Total Fluid 

Injected 

(Low to High)

(gallons)

Average Volume of 

Total Fluid Injected 

(gallons)

CBI? CBI? CBI? CBI?

Table 5. Formulation/Mixture/Water Specifications

CBI?

Geological Facto

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

YesYesYesYesYesYesYesYesYesYesYesYesYesYes

Yes Yes Yes Yes Yes 

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes

YesYesYesYesYesYesYes
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

Question Number

CBI?

CBI?

CBI?

CBI?

CBI?

CBI?

CBI?

Hydraulic Fracturing

Cross reference your comments by question number and indicate the confidential stat

box next to “Yes” under "CBI?" (Confidential Business Information). 

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

CBI?

CBI?

CBI?

CBI?

CBI?

CBI?

CBI?

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

CBI?

CBI?

CBI?

CBI?

CBI?

CBI?

CBI?

CBI?

CBI?

CBI?

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

CBI?

CBI?

CBI?

CBI?

CBI?

CBI?

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

CBI?

CBI?

CBI?

CBI?

Yes

Yes

Yes

Yes
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)

Comments

 comments by question number and indicate the confidential status of your comment by checking the 

er "CBI?" (Confidential Business Information). 

Comment
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)
November 19, 2010 Response of Patterson-UTI Energy, Inc. to

September 9, 2010 Request of U.S. Environmental Protection Agency

(supersedes prior version)
Transportation-Related Municipal Separate Storm Sewer Systems (MS4s) Questionnaire Drop Down Tables

State Names and Abbreviations

Select

AL

AK

AS

AZ

AR

CA

CO

CT

DE

DC

FM

FL

GA

GU

HI

ID

IL

IN

IA

KS

KY

LA

ME

MH

MD

MA

MI

MN

MS

MO

MT

NE

NV

NH

NJ

NM

NY

NC

ND

MP

OH

OK

OR

PW

PA

PR

RI

SC

SD

TN

TX

UT

VT

TEXAS

UTAH

PENNSYLVANIA

PUERTO RICO

RHODE ISLAND

SOUTH CAROLINA

No Answer

VERMONT

SOUTH DAKOTA

TENNESSEE

OHIO

OKLAHOMA

OREGON

PALAU

NEW YORK

NORTH CAROLINA

NORTH DAKOTA

NORTHERN MARIANA ISLANDS

NEVADA

NEW HAMPSHIRE

NEW JERSEY

NEW MEXICO

MISSISSIPPI

MISSOURI

MONTANA

NEBRASKA

MARYLAND

MASSACHUSETTS

MICHIGAN

MINNESOTA

KENTUCKY

LOUISIANA

MAINE

MARSHALL ISLANDS

ILLINOIS

INDIANA

IOWA

KANSAS

GEORGIA

GUAM 

HAWAII

IDAHO

FEDERATED STATES OF MICRONESIA

FLORIDA

ARKANSAS

CALIFORNIA 

COLORADO 

CONNECTICUT

ALABAMA

ALASKA

AMERICAN SAMOA

ARIZONA 

DELAWARE

DISTRICT OF COLUMBIA
Transportation-Related Municipal Separate Storm Sewer Systems (MS4s) Questionnaire Drop Down Tables

VI

VA

WA

WV

WI

WY

Yes/No Yes/No DB Codes

Select No Answer

Yes Yes

No No

am/pm am/pm DB Codes

Select No Answer

am am

pm pm

Purpose Table 1 Purpose Table 1DB Codes

WEST VIRGINIA

WISCONSIN

WYOMING

VIRGIN ISLANDS

VIRGINIA 

WASHINGTON