## MEMORANDUM

TO: Lisa Biddle, U.S. EPA

FROM: Brent Ruminski, ERG

DATE: March 31 , 201 5

SUBJECT: Analysis of DI Desktop ® (DCN SGE 00 963 )

This memorandum describes ERG’s analysis of Drillingi nfo’s (DI) Desktop® Well File

Database that ERG used to supplement other analyses for the Technical Development Document for Proposed Effluent Limitations Guidelines and Standards for Oil and Gas Extraction (DCN

SGE00704 ) (hereafter, referred to as the TDD). Specifically, this memorandum focuses on how

ERG developed a database of active unconventional oil and gas ( UOG ) wells from Drillinginfo ’s

nationwide database of all oil and gas wells

. Table 1 lists the relevant TDD tables and/or figures

and the TDD analyses supported by this database called DI Desktop ® Development Database (DCN SGE00963.A 0 1 )

. TDD t ables and figures not listed in Table 1 either did not require

calculations and/or analyses by ERG or are described in separate, supporting memoranda. Appendix F of the TDD contains a crosswalk of all tables and figures in the TDD and the name

of the relevant supporting memorandum , where applicable. This memorandum is organized into the following sections:

 Section 1.0 provides background information about the DI Desktop® database and the purpose of this analysis.

 Section 2.0 discusses how ERG analyzed the DI Desktop® database.

 Section 3.0 summarizes the results of the DI Desktop® database analysis and how they compare to literature.

 Section 4.0 describes ERG’s quality assurance procedures.

 Section 5.0 lists the references used for these analyses.

 Section 6.0 provides the Microsoft Access® database attachment.

This memorandum will refer to the term UOG. EPA defines UOG resources 1 

### as crude oil and natural gas 2 

### produced by wells drilled 3 

### into low porosity, low permeability formations. Development of UOG resources often requires hydraulic fracturing of the reservoir rock by injecting large amounts of fracturing fluid at high pressures to create a network of fissures in the

rock formations

, giv ing the oil and/or natural gas a pathway to travel to the well for extraction. While coalbed methane (CBM) is sometimes referred to as an unconventional resource in

1 UOG resource types are categorized into shale and tight formations.

2 Natural gas can include “natural gas liquids,” components that are liquid at ambient temperature and pressure.

3 Oil and gas wells may be drilled using horizontal, vertical, or directio nal well trajectories. Drillinginfo refers to well trajectory as “drill type”.

### Memorandum

March 3 1 , 2015 Page 2

literature, it is not included with in the scope of the TDD

. As such, the term UOG does not
include CBM wells when used in this memorandum.

Table 1

. Other UOG Analyses Supported by t his Memorandum

TDD Chapter Supporting Analysis TDD Table or Figure Number Supporting Analysis

DCN

B UOG Potential by Resource Type as of January 1, 2012 Table B

- 3 a SGE00693.A 0 2

C DI Desktop® Long

- term Produced Water Rates Table C

- 7 & C

- 8 b SGE00724.A 0 2 and A 0 3

FracFocus® Fracturing Fluid Volumes Table C

- 6 & C

- 8 b SGE00724.A 0 4 and A 0 5

New Mexico Flowback Recovery Table C

- 6 & C

- 8 b SGE00724.A 0 7

Wyoming Flowback Recovery Table C

- 6 & C

- 8 b SGE00724.A10

Niobrara Flowback Recovery Table C

- 6 & C

- 8 b SGE00724.A12

a

— Methodolog y used to generate this table is explained in ERG’s memorandum titled Data Compilation Memorandum for the Technical Development Document (TDD) for Proposed Effluent Limitations Guidelines and Standards for Oil and Gas Extraction

– DCN SGE00 693

. b

— Methodologies used to generate these tables are explained in ERG’s memorandum titled Unconventional Oil and Gas (UOG) Produced Water Volumes and Characterization Data Compilation

– DCN SGE00724.



### 1.0 DI D ESKTOP 

### ® D EVELOPMENT 

### D ATABASE 

### B ACKGROUND



### Drillinginfo is an oil and gas research firm located in Austin, Texas. DI Desktop ® 

### is a comprehensive database generated by Drillingi nfo that contain s a record (i.e., row) for all oil and gas well s drilled in the United States. 4 

### Drillingi nfo uses oil and gas databases maintained by

indiv idual state oil and gas agencies to create the DI Desktop ® 

### database

. For this analysis, ERG

downloaded a version of the DI Desktop ® 

### database on January 5, 2012 . F or the most part , this version of DI Desktop® reflects wells drilled the second half of 2011. State

- level i nformation such as the oil and gas agency names, last production date 5 

### , production start date 6



### , and update frequency (e.g., monthly, quarterly) is provided in Drillinginfo’s Data Coverage table (DCN

SGE0 102 7). The raw DI Desktop ® 

### database ERG used for this analysis is contained in the “HDPI_EXPRT” table of Attachment 1 (DCN SGE00963.A 0 1) in addition to DC N SGE00520

.

Basic well data contained in the DI Desktop ® 

### for each well includes: well API number 7



### , location, operator, and well trajectory. DI Desktop ® 

### also includes annual oil, gas, and produced water production per well. Table 2 provid es the complete list of data fields in the DI Desktop® database. The fields ERG used either in this analysis or other TDD supporting analyses are

marked with an asterisk. All other fiel ds were not used by ERG.

4 The database is subject to restrictions on its use and dissemination. Based on the license agreement discussions,

access to the raw data in the database is limited to ERG and EPA personnel only; although summary data developed using queries can be disseminated more widely. Wholesale “data dumps” cannot be disseminated electronically. All disseminations of such summary data, however, should cite Drillinginfo as the source of the information.

5 This is the date that the state last updated the data that Drillinginfo included in ERG’s version of the DI Desktop® database downloaded on January 5, 2012.

6 First year that the state agency maintained records for oil and gas wells.

7 An API number is a unique identifier assigned to each well drilled for oil and gas in the United States. The API number was originally assigned based on standards established by the American Petroleum Institute (API).

### Memorandum

March 3 1 , 2015 Page 3

The DI Desktop® database includes records for wells that are no longer active (i.e., shut in), underground injection wells 8 

### that do not produce oil and gas, conventional oil and gas (COG) wells, CBM wells, and UOG wells. It does n ot, however, contain a field that indicates if

wells are conventional or unconventional. Section 2.0 describes how ERG determined which

active wells in the raw data base are drilled into UOG formations.

Table 2 . Field Names and Descriptions in the DI Desktop® Database

Field Name Description

ENTITY_ID * HPDI assigne d ID unique to a given property. A well is referred to as a “property” in the DI Desktop database.

API_NO * API assigned number of a well on the property.

PROPERTY_TYPE Property type (e.g., lease, unit, well, completion, other, unknown).

PRODUCTION_TYPE * Production type (e.g., oil, gas, injection ).

WELL_NAME Operator assigned well/lease name of the property.

FIELD Field name the property is reporting from.

LEASE_NO State number assigned to the property or lease or unit the property is part of.

WELL_NO Operator assigned well number of the property

. CURR_OPER_NAME Current operator name.

LIQ_GATH_NAME_1 Current primary liquid gatherer for a property.

GAS_GATH_NAME_1 Current primary gas gatherer for a property.

SPUD_DATE * Latest date drilling commenced on property.

COMMON_OPER_NAME Co rporate entity that is determined by HPDI to own the current operator.

LATITUDE Latitude the property is located in

LONGITUDE Longitude the property is located in

LOCATION Township the property is located in

. COUNTY County the property is located in.

DISTRICT District within a given state the property is assigned.

STATE * State the property is located in.

OFFSHORE Offshore waters indicator.

RESERVOIR Reservoir, formation, zone, or pool that the property is reported as producing from.

SECTION Section property is located in.

QTR_QTR Quarter the property is located in (note: Texas only).

MERIDIAN Meridian legal description is referenced from.

BASIN * The basin the property is located in

. STATUS * Current status of the well (e.g., active, inactive, shut in).

TOTAL_DEPTH Total depth the well was drilled to.

COMPLETION_DATE * Latest completion date of the well

. DRILL_TYPE * This is the configuration of the wellbore (equivalent to EPA’s use of “well trajectory”). Options include: H

– Horizontal; D

– Directional; V

– Vertical; U

– Unknown.

FORMATION * Formation that the property is reported as producing from.

8 For more information about underground inject ion wells, see ERG’s TDD supporting memorandum titled Analysis of Active Underground Injection for Disposal Wells

- DCN SGE 00736.

### Memorandum

March 3 1 , 2015 Page 4

Table 2 . Field Names and Descriptions in the DI Desktop® Database

Field Name Description

LATEST_FLOW_PRESS

URE Latest flow pressure reported. Note: for instances where duplicate API numbers were combined, the minimum value was selected.

LATEST_WHSIP Latest well head shut

- in pressure reported. Note: for instances where duplicate API numbers were combined, the minimum value was selected.

SumOfLIQ_DAILY Average daily liquid production in last 12 months

. SumOfGAS_DAILY Average daily gas production in last 12 months

. SumOfLIQ_CUM Cumulative liquid production of property

. SumOfGAS_CUM Cumulative gas production of property

. SumOfW R T_CUM Cumulative water production of property

. LAST_PROD_DATE * Last date production was reported for the property

. SumOfLIQ_YEAR Oil production reported in barrels in the 12 months ending with
LAST_PROD_DATE

. SumOfGAS_YEAR Gas production reported in MCF in the 12 months ending with LAST_PROD_DATE

. SumOfWTR_YEAR Water production reported in b ar rels in the 12 months ending with
LAST_PROD_DATE

. LATITUDE_BOTM Bottom hole latitude of the property.

LONGITUDE_BOTM Bottom hole longitude of the property.

SumOfLIQ07 Oil production in barrels for 2007

. SumOfGAS07 Gas production in thousand cubic feet for 2007

. SumOfWTR07 * Water production in barrels for 2007

. SumOfLIQ08 Oil production in barrels for 2008

. SumOfGAS08 Gas production in thousand cubic feet for 2008

. SumOfWTR08 * Water production in barrels for 2008

. SumOfLIQ09 Oil production in barrels for 2009

. SumOfGAS09 Gas production in thousand cubic feet for 2009

. SumOfWTR09 * Water production in barrels for 2009

. SumOfLIQ10 Oil production in barrels for 2010

. SumOfGAS10 Gas production in thousand cubic feet for 2010

. SumOfWTR10 * Water production in barrels for 2010

. SumOfLIQ11 Oil production in barrels for 201 1

. SumOfGAS11 Gas production in thousand cubic feet for 201 1

. SumOfWTR11 * Water production in barrels for 201 1

. PROD09 Yes/No flag indicating if oil and/or gas production was greater t han zero in 2009

. PROD10 Yes/No flag indicating if oil and/or gas production was greater t han zero in 20 10.

PROD11 Yes/No flag indicating if oil and/or gas production was greater t han zero in 2011.

ACTIVE_FLAG Yes/No flag indicating active status based on production

ACTIVE_PROD_FLAG Yes/No flag indicating whether entity is active ( using the ACTIVE_FL field ) and had production in 2011 ( using t he PROD11 field )

. SHALE_FLAG Yes/No flag for Pennsylvania only indicatin g if the type of production is s hale gas.

TEST_DATE Date of the most recent well test.

TEST_TIMES_TESTED Total number of times the well was tested.

TEST_GAS_CUM Cumulative reported gas at the time of the most recent well test.

### Memorandum

March 3 1 , 2015 Page 5

Table 2 . Field Names and Descriptions in the DI Desktop® Database

Field Name Description

TEST_GOR Gas to oil ratio at the time of the most recent well test.

TEST_FLOW_PRES Well head flowing pressure at the time of the most recent well test.

TEST_FLOWOZ Flowing pressure divided by Z

- Factor at th e time of the most recent well test.

TEST_WHSIP Well head shut

- in pressure at the time of the most recent well test.

TEST_SIPOZ Bottom hole pressure divided by the Z

- Factor, if well head shut

- in pressure is provided at the time of the most recent well test.

TEST_GAS_GRAVITY Gas gravity at the time of the most recent well test.

TEST_LIQ_GRAVITY Liquid gravity at the time of the most recent well test.

TEST_GAS_VOLUME Daily gas production at the time of the most recent well test.

TEST_ WAT _VOLUME Daily water production at the time of the most recent well test.

TEST_ LIQ _VOLUME Daily liquid production at the time of the most recent well test.

TEST_TYPE Type of test conducted for the most recent well test.

TEST_CHOKE_SIZE Choke used during the most recen t well test.

TEST_TBG_PRES Pressure present in the tubing at the time of the most recent well test.



### 2.0 A NALYSIS 

### M ETHODOLOGY



### The following steps describe how ERG used the raw DI Desktop® database to make a list of active oil and gas extraction wells drilled into UOG formations. These steps outline the queries in Attachment 1 (DCN SGE00963.A 0 1).

Step 1

– Create Production Type Crosswalk

T he raw DI Desktop® database contains many different types of wells including those where the primary purpose is not oil and gas extraction (e.g., injection for enhanced recovery). The type of well is indicated by the PRODUCTION_TYPE field. However, due to terminology differences between state oil and gas agencies, there are 441 combinations of production types in the DI Desktop® database 9



### . Therefore, ERG created a crosswalk to identify the production types that represent oil and gas extraction. Table 3 shows a few examples of the most common production types reported and those that ERG flagged as oil and/or gas extraction

. The full crosswalk is in the table called “Prod Type Crosswalk” in Attachment 1 ( DCN

SGSE 00963.A 0 1). Section 3.0 discusses data quality related to this crosswalk

.

9 For example, most North Dakota wells are reported as “O&G” production types but in Texas, most wells are

classifi ed as “OIL”, “GAS”, or “OIL,GAS”.

### Memorandum

March 3 1 , 2015 Page 6

Table 3

. Examples from the Production Type Crosswalk

Production Type a Oil and /or Gas Extraction Well Flag b Number of Wells with Production Type c

OIL Yes 989,903

GAS Yes 668,078

(N/A) No 475,546

O&G Yes 229,143

DRY No 173,213

CBM Yes 78,200

SW INJ No 37,564

INJ No 33,496

GAS,OIL Yes 29,752

a

— This is the well type reported in the PRODUCTION_TYPE field in the DI Desktop® database

. b

— This field is flagged as yes if ERG considered the production type to be oil and gas extraction wells

.

c

— These are the total number of records in the raw database.



### Step 2

– Create Active Oil and Gas Wells Table

ERG used queries 100 through 103 in Attachment 1 to create a list of active oil and gas

extraction wells. These queries cross reference each well record in the DI Desktop® database against the Production Type Crosswalk ERG created in Step 1. O nly well records where the

PRODUCT I ON_TYPE field is flagged as oil and gas extraction and identified as active are included in the results . For most states, ERG considered active wells to be those that produced oil, gas, and/or water during the year that the data was last updated by Drillinginfo

. 10 

### The most

recent production date for each state is provided in Drillinginfo’s Data Coverage table (DCN

SGE0 1027 ). The table called “Active Oil and Gas Wells” in Attachment 1 contains the final list

of active wells. Table 4 describes queries 100 through 103 in more detail. Because each state updates their data at different times, ERG used separate queries f or different states to complete this step. 11

10 This is the date that the state last updated the data that Drillinginfo included in ERG’s version of the DI Desktop® database downloaded on January 5, 2012.

11 For MD, NY, OH, OR, and WV the last data update date was December 2010. For KY and TN, the last data update date was December 2009. For all other states except for PA, the last data update was between June and November 2011 (DCN SGE01027). Due to the lack of entries in the last production field for PA, ERG instead used the STATUS field to identify active PA wells.

### Memorandum

March 3 1 , 2015 Page 7

Table 4

. Step 2 Query Descriptions

Query Description

100

– Make

Active Wells

Table This query creates a new table called “Active Oi l and Gas Wells ” and populates it with well

records from the full DI Desktop® database that meet the following criteria:

 The PRODUCTION_TYPE field matches one of the oil and gas production types (assigned by ERG) in the Production Type crosswalk table ;

 The LAST_PROD_DATE field contains a date on or after 1 /1/2011; and

 The well is not located in MD, NY, OH, OR, WV, KY, TN or PA. This query also creates two new field names called CONSOLIDATED_FORMATION_NAME and RESOURCE_TYPE. This field is left blank, but is populated in Step 4.

101

– Append
MD, NY, OH, OR, and WV This query appends well records from the full DI Desktop® database to the “Active Oil and

Gas Wells ” table that meet the following criteria:

 The PRODUCTION_TYPE field matches one of the oil and gas production types (assigned by ERG) in the Productio n Type crosswalk table ;

 The LAST_PROD_DATE field contains a date on or after 1 2 /1/201 0 ; and

 The well is located in MD, NY, OH, OR, or WV

102

– Append KY

and TN This query appends well records from the full DI Desktop® database to the “Active Oil and

Gas Wells ” table that meet the following criteria:

 The PRODUCTION_TYPE field matches one of the oil and gas production types (assigned by ERG) in the Production Type crosswalk table ;

 The LAST_PROD_DATE field contains a date on or afte r 12 /1/2009; and

 The well is located in KY or TN

. 103

– Append PA This query appends well records from the full DI Desktop® database to the “Active Oil and

Gas Wells ” table that meet the following criteria:

 The PRODUCTION_TYPE field matches one of the oil and gas production types (assigned by ERG) in the Production Type crosswalk table ;

 The well STATUS field is “Active”; and

 The well is located in PA.



### Step 3

– Create Consolidated Formation Crosswalk

T he DI Desktop® database does not identify wells as unconventional or conventional. However, it identifies the basin and formation in which the well is completed. ERG used

information in the BASIN and FORMATION fields to identify UOG wells. However, because

the se fields include inconsistent naming conventi ons and spelling errors, ERG created a comprehensive crosswa lk between the basin and formation combinations reported in DI Desktop®

, consolidated UOG formation names

, and the applicable resource type

. Table 5 provides examples of these consolidations. The full crosswalk contains over 66,000

combinations and is in the table called “Consolidated Formation Crosswalk” in Attachment 1 (SGE DCN00963.A 0 1). Section 3.0 discusses data quality related to this crosswalk.

To assign consolidated UOG formation names, ERG searched the list of reported basin

and formation combination s for the UO G formation names listed in Table 9.3 of EIA’s Assumptions to the 2014 Annual Energy Outlook report ( DCN SGE 00988). ERG used other references to supplement the EIA report as needed to identify unconventional formation s and

resource . The DOCUMEN TATION field in the consolidated formation crosswalk contains the DCN(s) for the reference (s) ERG used to identify each unconventional formation

.

### Memorandum

March 3 1 , 2015 Page 8

Table 5 . Formation Consolidation Examples

Reported Basin in Desktop Reported Formation in Desktop Consolidated

Formation (assigned by ERG) Resource Type

(assigned by ERG)

TEXAS & LOUISIANA GULF COAST EAGLEFORD Eagle Ford shale

TEXAS & LOUISIANA GULF COAST EAGLE FORD Eagle Ford shale

TEXAS & LOUISIANA GULF COAST EAGLE FORD SHALE Eagle Ford shale

ANADARKO GRANITE WASH Granite Wash tight

ANADARKO GRANITE WASH CONS Granite Wash tight

ANADARKO GRANITE WASH

- C

- Granite Wash tight

EAST TEXAS HA Haynesville shale

EAST TEXAS HAYNESVILLE SHALE Haynesville shale

EAST TEXAS HAYNESVILLE Haynesville shale



### Step 4

– Update Active Oil and Gas Table (Query 2 00)

Lastly, ERG used Query 200 in Attachment 1 to update the “ Active Oil and Gas Wells ”

table with consolidated UOG formation names. This q uery updates the RESOURCE_TYPE and

CONSOLIDATED FORMATION NAME fields in the “Active Oil and Gas Wells” table by

cross referenc ing the reported basin and formation combination against the “Consolidated

Formation Crosswalk” table ERG created in S tep 3

.

3.0 DI D ESKTOP 

### ® A NALYSIS 

### R ESULTS



### Table 6 shows the total number of active well s identified by ERG in the DI Desktop® database by resource type and well trajectory . ERG ge nerated the results in Table 6 using query

300 in Attachment 1. 12 

### For comparison, the total number of active oil and gas wells reported by

EIA in 2009 (DCN SGE01022) i s included in Table 6

. Wells that ERG did not identify as UOG are included in the COG and CBM category.

The total number of oil and gas wells that were active in 2011 may have been higher than the number ERG estimated (i.e., 6 20,000 wells). This is primarily because the
PRODUCTION_TYPE field was reported as “N/A” for over 450,000 well records in the DI Desktop® database such that ERG could not identify all oil and gas extraction well s (see Table 3 in Step 1 ). Further, the total number of UOG wells that were active in 2011 may have been higher than the number ERG estima ted (i.e., 16 0 ,000 wells). This is primarily because the

FOMRATION field for over 140,000 active oil and gas wells identified by ERG was reported as “N/A”, “0”, “(N”, or blank such that ERG could not identify a common formation name and

could not determine if the well was in a conventional or unconventional formation (see Step 3)

.

12 Query 300 is a crosstab query that counts the number of wells in the “Active Oil and Gas Wells” table by well trajectory and resource type.

### Memorandum

March 3 1 , 2015 Page 9

Table 6

. Active Oil and Gas Extraction Wells Summary

Resource Type Identified by ERG in DI Desktop® by Well Trajectory ( 201 1 ) a Reported by

EIA (end of 2009) b,c H orizontal D irectional V ertical U nknown Total

UOG: Tight 5,620 9,230 59,600 32,800 107,000 NR

UOG: Shale 22,400 1,820 15,100 15,300 54,700 NR

COG and CBM 7,820 17,000 201,000 231,000 457,000 NR

Total 35,900 28,100 276,000 279,000 619,000 82 5,000

a

— For the most part, this version of DI Desktop® reflects wells drilled during the second half of 2011 ( see DCN

SGE01027 for state

- by

- state dates).

b

— Source for EIA well c ounts: DCN SGE01022

c

— ERG was unable to identify a more recent national level count of active oil and gas wells

.



### 4.0 Q UALITY 

### C ONTROL 

### P ROCEDURES



### All of the analyses presented in this memorandum adhered to the Environmental Engineering Support for Clean Water Regulations Programmatic Quality Assurance Project Plan (PQAPP) ( DCN SGE00957) and the Unconventional Oil and Gas (UOG) Supplemental Quality Assurance Project Plan (SQAPP) (DCN SGE00 958 ), including collecting, evaluating, and analyzing existing data and information

.

Specifically, ERG used the procedures described in Sec tion 4 of the PQAPP to gather and manage existing data in support of the UOG proposed rulemaking. ERG staff entered reference

information for relevant sources into the UOG Literature Review database. The ERG index keeper reviewed all reference information, assigned each reference a Document Control Number (DCN ), imported the reference information into the UOG Project File Index database, and saved referenced files in the Electronic Project File folder.

ERG also used the procedures described in Section 3 of the SQAPP when collecting existing data for use in the UOG proposed rulemaking. ERG used a combination of sources, including reports, papers, and online databases from state regulatory agencies such as departments (e.g., oil and gas commissions )

. As shown in Table 7 in this memorandum, ERG assigned a source flag (A, B, C or D ) to all references used in these analyses. ERG did not use any Source Flag C or D references in this analysis. ERG defines each source flag as follows:

 Source Flag A

- J ournal articles and documents prepared by or for a government agency (e.g., site visit reports, industry meeting notes);

 Source Flag B

- Documents prepared by a verified source 13 

### that include citation information (e.g., operator reports, vendor documents, conference presentations, university publications);

 Source Flag C

- Documents prepared by a verified source that do not include citation information (e.g., operator reports, vendor documents, conference presentations); and

13 ERG considered sources as “verified” if we were able to find information about the author outside of the reference document. ERG primarily verified information by looking for company/organization websites that confirmed the

author’s affiliation with the UO G industry

### Memorandum

March 3 1 , 2015 Page 10

 Source Flag D

- Documents prepared by a source that could not be verified and that

do not include citation information

.

EPA and ERG followed the procedures desc ribed in Section 7.0 of the PQAPP to generate, evaluate, and analyze data. ERG conducted the following QA checks during the analyses:

 

### ERG created the Microsoft Access database provided in Attachment 1 and performed a 100 percent check of all queries , and d ocumented these in internal

versions of the databases

.

 

### ERG created two crosswalks in the Microsoft Access database provided in Attachment 1 and performed a 20 percent check of all records in them.

 

### ERG had a senior staff member familiar with ELGs and the UOG proposed rulemaking review all analyses

.

5.0 R EFERENCES



### Table 7 provides DCNs, citations , and source flags fo r references used in the s e analyses

. The references in Table 7 are sorted numerically by DCN.

Table 7 . References

DCN Source Citation Source Flag a

SGE00153 U.S. Energy Information Administration (EIA). 2011. Shale Gas Plays,

Lower 48 States. Prepared by EIA Office of Oil and Gas. (May). A

SGE00155 U.S. Energy Information Administration (EIA). 201 0 . Tight Sands Gas Plays,

Lower 48 States. Prepared by EIA Office of Oil and Gas. ( J une ). A

SGE00442.A06 Murray, Kyle E. 2013. Examining Water Production Volumes and Produced

Water Quality in the Mississippi Lime to Develop Appropriate Management Strategies. Mississippi Lime Production and Produced Water. B

SGE00330 Energy Information Administration (EIA). 2011. Review of Emerging

Resources: U.S. Shale Gas and Shale Oil Plays. A

SGE0048 6 Energy Information Administration. 201 3 . Assumptions to the Annual

Energy Outlook 201 3

. A

SGE00520 Drillingi nfo. 2011. DI Desktop® D ecember 2011 Download. Drillingi nfo,

Inc. Downloaded 1/5/2012. B

SGE00694 Oklahoma Geological Survey. 2014. Gas Shale Database. Accessed January

29, 2014. A

SGE00736 ERG. 2015. Analysis of Active Underground Injection for Disposal Wells. A

SGE00957 Eastern Research Group, Inc. 2014. Environmental Engineering Support for

Clean Water Regulations Programmatic Quality Assurance Project Plan (PQAPP)

. A

SGE00958 Eastern Research Group, Inc. 2014. Unconventional Oil and Gas (UOG)

Supplemental Quality Assurance Project Plan (SQAPP)

. A

SGE00988 Energy Information Administration. 2014. Assumptions to the Annual

Energy Outlook 2014. A

### Memorandum

March 3 1 , 2015 Page 11

Table 7 . References

DCN Source Citation Source Flag a

SGE00991 United States Geological Survey. 2008. Assessment of Undiscovered Oil and

Gas Resources of the Permian Basin Province of West Texas and Southeast New Mexico, 2007. A

SGE01022 Energy Information Administration. 2011. Distribution and Production of Oil

and Gas Wells by State. (January 7). A

SGE01023 Office of Governor Dennis Gaugaard. 2012. South Dakota Oil and Gas

Development/Preparedness Executive Branch Work Groups : Summary of Findings . ( September )

. A

SGE0102 7 Drillinginfo. 2012. HPDI Data Coverage. (January 5). B

a

— Source Flag A

— Journal articles and documents prepared by or for a government agency (e.g., site visit

re ports, industry meeting notes). Source Flag B

— Documents prepared by a verified source that include citation information (e.g., operator reports, vendor docum ents, un iversity publications). Source Flag C

— Documents prepared by a verified source that do not include citation information (e.g., operator reports, vendor documents, conference presentations); and Source Flag D

— Documents prepared by a source that could not be verified and that do not include citation

information

.



### 6.0 A TTACHMENT

### Memorandum

February 19, 2015 Page 12

A TTACHMENT 

### 1 : DI D ESKTOP 

### ® D EVELOPMENT 

### D ATABASE 

### ( DCN SGE00 963 .A 0 1 )