## MEMORANDUM

Date: April 8, 2013

To: Bruce Moore, EPA/OAQPS/SPPD/FIG

From: Heather Brown, EC/R Incorporated

Subject: Revised Analysis to Determine the Number of Storage Vessels Projected to be Subject to New Source Performance Standards for the Oil and Natural Gas Sector

INTRODUCTION

On August 16, 2012, the Environmental Protection Agency (EPA) promulgated final new source performance standards (NSPS) and national emission stan dard s for hazardous air pollutants (NESHAP) for the oil and natural gas sector. Under the final rule, owners and operators of new, modified and reconstructed storage vessels with volatile organic compound ( VOC ) emissions greater than 6 tons per year (tpy) would be required to reduce emissions from each storage vessel by 95 percent. The EPA estimated that 304 new storage vessels per year would be subject to, and impacted by, the final NSPS. 1 

## This estimate was, in part, based on the distribution of storage ve ssels across existing wells and the assumption that 36 percent of the

new storage vessels would be subject to State regulations.

In October 2012, the EPA received Requests for Administrative Reconsideration of these final standards. One of the issues that formed the basis of industry’s request for reconsideration was EPA’s estimate of the number of storage vessels that would be impacted by the final rules

. The industry disputed this estimate as being too low , and stated their belief that the correct
estimat e of new storage vessels was more likely to number in the tens of thousands

. The industry voiced their concern that with such a large number of storage vessels, they would be
unable to meet the compliance requirements. As a result, the EPA decided to reana lyze the number of affected storage vessel s

. The purpose of this memorandum is to document the analysis to determine the number of potential affected storage vessel s. The analysis includes a revised estimate of the number of new storage vessels that would be subject to the NSPS (excluding those subject to State rules).

1 

### Oil and Natural Gas Sector: Standards of Performance for Crude Oil and Natural Gas Production, Transmission, and Distribution - Background Supplemental Technical Support Document for the Final New Source Performance Standards. April 2012. EPA Docket Numbe r EPA

- HQ -OAR- 2010

- 0505

- 4550.

## 2 SUMMARY OF ANALYSIS

The purpose of this analysis was to estimate the total number of new , modified or
reconstructed crude oil and condensate storage vessels that would be installed and would be subject to the NSPS from August 23, 2011 (the date upon which new, modified or reconstructed storage vessels become affected facilities under the NSPS), until October 15, 2015. The following is a summary of our analysis to estimate the number of storage vessels expected to be installed and subject to the NSPS :

• An average of approximately 8,700 new, modified or reconstructed crude oil storage
vessels are expected to be installed each year and to be subject to the NSPS

.

• An average of approximately 3,400 new, modified or reconstructed condensate storage
vessels are expected to be installed each year and to be subject to the NSPS.

• By the current NSPS compliance date of October 15, 2013, over 17,700 new, modified or
reconstructed crude oil storage vessels and 7,200 condensate storage vessels will have come online since the original August 23, 2011, proposal date.

PROCEDURE USED TO DETERMINE THE NUMBER OF NEW STORAGE VESSELS

In order to determine the number of new, modified or reconstructed storage vessels that would potentially be subject to the NSPS, we conducted this analysis using the following steps:

Steps
1. Estimate the number of wells completed (or to be completed) from 2011 through 2015.
2. Distribute the estimated number of comp leted wells identified across a series of production rate brackets.
3. Determine the total number of new, modified or reconstructed wells that would be completed between August 23, 2011, and October 15, 2015.
4. Determine the average number of storage vessels that would be associated with each new well completion.
5. Estimate emissions from a typical storage vessel within each production rate bracket.
6. Determine the number of storage vessels that would likely have VOC emissions greater
than the NSPS applicability t hreshold of 6 tpy.

7. Estimate the number of storage vessels likely to have VOC emissions greater than 6 tpy
that also would be subject to and controlled under State environmental regulations.
8. Subtract the number of storage vessels subject to and controlled under State environmental regulations from the number of storage vessels with VOC emissions greater than 6 tpy to determine the number of storage vessels that would be subject to
the NSPS.

## 3 Each of these steps will be discussed in detail in the following sec tions.

Step 1. Estimate the number of wells completed (or to be completed) for 2011 through
2015

For this analysis, it was assumed that the large majority of new , modified or reconstructed storage vessels would be associated with new well completions . Therefore, the first step was to
estimate the number of new wells that would be completed from 2011 to 2015

. The Energy Information Administration (EIA) “... collects, analyzes, and disseminates independent and impartial energy information to promote sound policymaking, efficient markets, and public understanding of energy and its interaction with the economy and the
environment. ” 2 

## The EIA maintains the National Energy Modeling System (NEMS), 3 

## a forecasting model used to produce the EIA’s Annual Energy Outloo k (AEO), which provides detailed forecasts of the United States energy economy. T he NEMS forecasting model was used to generate estimates and predictions for drilling activity for 2009 through 2015. Table 1 presents the number of completed onshore wells fo r the lower 48 States between 2009 and 2015. As shown in Table 1, the NEMS forecasting model also provided forecasts for successful exploration and development wells. The NEMS model also forecasts the drilling of dry wells,
which were assumed to not be com pleted and needing storage vessels. A development well is defined by the EIA as “a well drilled within the proved area of an oil or gas reservoir to the depth of a stratigraphic horizon known to be productive.” Based on this definition, it was
assumed that completed development wells would most closely represent new producing
wells. Therefore, for this analysis, we used the number of development oil and gas wells from 2009 through 2015 to represent the number of new producing wells.

Step 2. Distribute the e stimated number of completed wells identified across a series of production rate brackets

As previously discussed, during the development of the final NSPS, we based our original estimate of the number of storage vessels expected to be impacted by the NSPS each year on a distribution of storage vessels across existing wells. The distribution wa s based on a range of production rates defined for the oil and natural gas production NESHAP (40 CFR part 63, subpart HH). These ranges were as follows: less than 15 barrels per day (bbl/day); between 15 and 100 bbl/day; between 100 and 1,000 bbl/day; and greater than 1,000 bbl/day.

2 

### “About EIA.” http://www.eia.gov/about/

3 

### An overview of the model and complete documentation of NEMS can be found at <http://www.eia.doe.gov/oiaf/aeo/overview/index.html>.

## Table 1. Completed Onshore Wells from 2009 to 2015 for Lower 48 States a



### 2009 2010 2011 2012 2013 2014 2015 Lower 48 Onshore Exploration



## Total Wells 2,966 3,287 5,321 4,769 5,185 5,411 5,709

Oil 610 764 1,035 954 1,012 1,068 1,136
Gas 1,284 1,257 1,729 1,571 1,723 1,766 1,860 Dry 1,072 1,266 2,558 2,244 2,450 2,577 2,713 Development



## Total Wells 31,057 39,641 40,547 37,026 36,958 40,831 43,750

Oil 10,855 18,440 18,023 16,445 17,452 18,519 19,567
Gas 17,693 17,740 18,979 17,603 16,369 18,902 20,563 Dry 2,509 3,461 3,545 2,977 3,137 3,410 3,620 Exploration and Development



## Total Wells 34,023 42,928 45,868 41,795 42,143 46,242 49,459

Oil 11,464 19,204 19,058 17,399 18,464 19,587 20,703
Gas 18,978 18,997 20,708 19,175 18,092 20,668 22,423 Dry 3,581 4,727 6,102 5,221 5,587 5,987 6,333

a 

## Data obtained from the Energy Information Administration (EIA) NEMS 2012 forecasting model.

4

## 5 The EIA publishes an historical distribution of wells by production rate bracket up to 2009 (see
Attachment 1). 4 

## We used these more narrow production rate brackets to define the categories for which a relative distribution of wells and their productivity would be developed.

In a separate memorandum (see Attachment 2), 5 

## the number of new wells within each of the
ide ntified production rate brackets was estimated . Drilling permit data (including well location, operator and production characteristics) collected by HPDI 6 

## were used to develop crude oil and condensate production distributions across the defined production r ate brackets for 2009. The development of the distribution across the production rate brackets is presented in Attachment
2

. Table s 2 and 3 present estimated distribution o f oil and gas wells , respectively, within each production rate bracket from the HPDI database.

As discussed in the memorandum provided in Attachment 2, the number of new wells in 2009 that were identified in the HPDI represents approximately 44.1 percent and 82.8 percent of the EIA’s 2009 national estimate of new oil and gas well complet ions, respectively. Although a fraction of the national number of oil and gas wells completions is represented in the analysis, it was assumed that the estimated relative distribution would be representative of the U.S oil and gas well population.

Step 3. Determine the total number of new, modified or reconstructed wells that would be completed between August 23, 2011, and October 15, 2015.

The next step was to determine the total number of new wells that would be completed between August 23, 2011 (the date upon which new storage vessels would become affected facilities under the final NSPS) , and October 15, 2015. Assuming that, on average, a constant number of wells would be completed each day throughout each year, the total number of wells
for 2011 and 201 5 were adjusted to represent the portion of each year contained in the period defined above. For 2011, there are 131 days from August 23 through December 31, 2011, or 35.8 percent of the year. Therefore, the number of new oil wells and new gas wells comple ted in 2011 were multiplied by 35.8 percent. Similarly, there are 287 days from January 1 through October 15, 2015, or 78.6 percent of the year. Therefore, number of new oil wells and new gas wells completed between January 1 and October 15, 2015 were mult iplied by 78.6 percent

. Tables 2 and 3 present the number of new wells completed between August 23, 2011, and October 15, 2015 . These estimates were calculated by applying the relative distribution from

4 

### “US Total Distribution of Wells by Production Rate Bracket.” ftp:/ /www.eia.doe.gov/pub/oil_gas/petrosystem/us_table.html

5 

### Memorandum from Robinson, et al., ICF International, to Brown, H., and D. Hendricks, EC/R Incorporated. Liquids Production Distribution for New Oil and Gas Wells in the US. March 25, 2013. (Included as Attachment 2)

6 

### HPDI is a data service company that provides data products and decision

- support applications, which was acquired by Drilling Info, Inc. HPDI collects drilling permit data from state and local governments

.

### Table 2. Distribution of New Completed Oil Wells Across Production Rate Brackets

Oil Well Production
Rate Bracket Number of New Completed Oil Wells in
2009 HPDI Distribution of New Oil Estimated Number of New Completed Oil Wells From August 23, 2011 through October 15, 2015 c 

### (BOE/day) Database a 

### Wells b 

### 2011 d 

### 2012 2013 2014 2015 e



### 0 ‐ 1 3 0 0.64% 42 106 113 119 99
1 ‐ 2 4 5 0.96% 62 159 169 179 149
2 ‐ 4 109 2.33% 151 384 408 433 359
4 ‐ 6 110 2.35% 153 388 411 437 362
6 ‐ 8 140 3.00% 194 493 523 555 462
8 ‐ 10 135 2.89% 187 476 505 536 445
10 ‐ 12 137 2.93% 190 483 512 544 451
12 ‐ 15 215 4.60% 298 757 804 853 708
15 ‐ 20 373 7.98% 516 1,313 1,394 1,479 1,229
20 ‐ 25 374 8.01% 518 1,317 1,398 1,483 1,232
25 ‐ 30 358 7.66% 496 1,261 1,338 1,420 1,179
30 ‐ 40 546 11.7% 756 1,922 2,040 2,165 1,798
40 ‐ 50 340 7.28% 471 1,197 1,271 1,348 1,120
50 ‐ 100 733 15.7% 1,015 2,581 2,739 2,906 2,414
100 ‐ 200 558 11.9% 773 1,965 2,085 2,212 1,838
200 ‐ 400 325 6.96% 450 1,144 1,214 1,289 1,071
400 ‐ 800 112 2.40% 155 395 419 444 370
800 ‐ 1600 21 0.45% 29 74 79 84 69
1600 ‐ 3200 6 0.13% 9 22 23 24 20
3200 ‐ 6400 4 0.086% 6 15 15 16 13
6400 ‐ 12800 1 0.021% 14444

> 12800 0 0% 00000
To tal 4,672 100% 6,472 16,456 17,464 18,530 15,394 BOE/day = Barrels of oil equivalent per day; the approximate energy released by burning one barrel of crude oil per day.

a Calculated in separate memorandum, contained in Attachment 1.

b Relative distribution calculated by dividing number of wells for each rate class by total number of wells (4,672) identified in
the HPDI Database.

c Number of new wells calculated by applying the distribution in each production rate bracket to the total number of wells (from Table 1) in 2011 through 2015. Calculated number of wells was rounded up to the nearest whole well.

d The total number of new wells in 2011 was adjusted by multiplying by 35.8 percent, which represents the percent of the year
from August 23 through December 31, 2011.

e The total number of new wells in 2015 was adjusted by multiplying by 78.6 percent, which represents the percent of the year
from January 1 through October 15, 2015.



### 6

### Table 3. Distribution of New Completed Gas Wells Across Production Rate Brackets

Gas Well Production Rate Bracket Number of New Completed Gas Wells
in 2009 HPDI Distribution of New Gas Estimated Number of New Completed Gas Wells From August 23, 2011 through October 15, 2015 c 

### (BOE/day) Database a 

### Wells b 

### 2011 d 

### 2012 2013 2014 2015 e



### 0 ‐ 1 464 3.34% 228 589 547 632 541
1 ‐ 2 255 1.84% 125 324 301 348 297
2 ‐ 4 474 3.41% 233 601 559 646 552
4 ‐ 6 560 4.03% 275 710 661 763 653
6 ‐ 8 468 3.37% 230 594 552 637 545
8 ‐ 10 384 2.76% 188 487 453 523 447
10 ‐ 12 298 2.15% 146 378 352 406 348
12 ‐ 15 412 2.97% 202 523 486 561 480
15 ‐ 20 554 3.99% 272 703 653 755 646
20 ‐ 25 493 3.55% 242 625 582 671 574
25 ‐ 30 388 2.79% 191 492 458 529 452
30 ‐ 40 678 4.88% 333 860 800 923 789
40 ‐ 50 546 3.93% 268 693 644 744 636
50 ‐ 100 1969 14.2% 966 2,496 2,321 2,680 2,293
100 ‐ 200 2780 20.0% 1,364 3,524 3,277 3,784 3,237
200 ‐ 400 1979 14.2% 971 2,509 2,333 2,694 2,305
400 ‐ 800 852 6.13% 418 1,080 1,005 1,160 992
800 ‐ 1600 254 1.83% 125 322 300 346 296
1600 ‐ 3200 50 0.36% 25 64 59 69 59
3200 ‐ 6400 27 0.19% 13 35 32 37 31
6400 ‐ 12800 3 0.022% 24454

> 12800 0 0% 00000
To tal 13,888 100% 6,816 19,625 18,392 20,927 16,178 BOE/day = Barrels of oil equivalent per day; the approximate energy released by burning one barrel of crude oil per day.

a Calculated in separate memorandum, contained in Attachment 1.

b Relative distribution calculated by dividing number of wells for each rate class by total number of wells (13,888) identified
in the HPDI Database.

c Number of new wells calculated by applying the distribution in each production rate bracket to the total number of wells (from Table 1) in 2011 through 2015. Calculated number of wells was rounded up to the nearest whole well.

d The total number of new wells in 2011 was adjusted by multiplying by 35.8 percent, which represents the percent of the year from August 23 through December 31, 2011.

e The total number of new wells in 2015 was adjusted by multiplying by 78.6 percent, which represents the percent of the year from January 1 through October 15, 2015.



### 7

## 8 Step 2 to the total number of new oil and gas well completions identified in Table 1 and adjusted to include portions of 2011 and 2015, as described above.

Step 4. Determine the average number of storage vessels that would be associated with each new well completion.

The next step in determining the number of storage vessels that would be potentially subject to Subpart OOOO was to estimate the number of storage vessels that would be associated with each new well completion. There were no reliable and verifiable data av ailable to indicate an average number of storage vessels associated with each well. Therefore, the following assumptions were made to determine how many new storage vessels would be subject to the
NSPS:

• The storage vessels with the highest emissions would be the first tank after the separator. This assumption was based on the fact that the first storage vessel after the separator experiences the highest pressure drop, resulting in the greatest potential for flashing emissions.

• Any remaining storage vessels associated with the well would be likely to have significantly lower emissions related to working and breathing losses from the tank.

• Additional tanks located at a well site are likely to be manifolded together for liquid
level control.

Based on these as sumptions, it was determined that an average of one tank per completed well would be subject to the NSPS. Therefore, the number of new oil and condensate storage vessels installed from 2011 through 2015 is equal to the number of new oil and gas wells

prese nted in Tables 2 and 3, respectively.

Step 5. Estimate emissions from a typical storage vessel within each production rate
bracket

Average storage vessel emission factors, in terms of mass of emissions per throughput, were developed under the final rule for both crude oil and condensate. 7 

## These emission factors were developed using the American Petroleum Institute’s (API’s) E&P Tanks program and more than 100 storage vessels across the country with varying characteris tics

. 8 

## The VOC emissions factors used for this analysis are:

7 

### Oil and Natural Gas Sector: Standards of Performance for Crude Oil and Natural Gas Production, Transmission, and Distribution - Background Supplemental Technical Support Document for the Final New Source Performance Standards. April 2012 . EPA Docket Number EPA

- HQ -OAR- 2010

- 0505

- 4550.
8 

### Production Tank Emissions Model. E&P Tank Version 2.0. A Program for Estimating Emissions from Hydrocarbon Production Tanks. American Petroleum Institute. Software Number 4697. April 2000.

## 9 Uncontrolled VOC Emissions from Crude Oil Storage Vessels = 0.214 tpy VOC/bbl/day

Uncontrolled VOC Emissions from Condensate Storage Vessels = 2.09 tpy VOC/bbl/day

To estimate the emissions from an average storage vessel within each production rate bracket,

w e developed average production rates for each bracket. This average was calculated using the EIA published nationwide production per well per day for each production rate bracket from
2006 t hrough 2009 (see Attachment 2). Table 4 present s the average oil production and condensate production in barrels per well per day, respectively. For this analysis, we considered the liquid produced (as reported by the EIA) from oil wells to be crude oil an d from gas wells to
be condensate.

The average VOC emissions for each new storage vessel within each production rate bracket were calculated by applying the average production rate (bbl/day) to the VOC emission factor (tpy VOC/bbl/day) and are presented in Table 4.

Step 6. Determine the number of storage vessels that would likely have VOC emissions greater than the NSPS a pplicability threshold of 6 tpy

The next step was to determine the number of storage vessels that would potentially be subjec t to the NSPS by having VOC emission greater than 6 tpy. As shown in Table 4, crude oil storage vessels in the production rate bracket of 30 to 40 BOE/day and higher have average emissions greater than 6 tpy , meaning these storage vessels would be potentia lly subject to the NSPS

. Similarly, condensate storage vessels in the production rate bracket of 40 to 50 BOE/day and higher have emissions greater than 6 tpy.

Tables 5 and 6 present the total number of new oil and condensate storage vessels, respectively, expected to be installed each year that could potentially be subject to the NSPS. As shown in Table 5, approximately 42,000 new oil storage vessels could be potentially subject
to the NSPS over the August 23, 2011, to October 15, 2015 time period

. Over th e sam e period,

a pproximately 46,000 new condensate storage vessels could be potentially subject to the NSPS, as presented in Table 6.

Step 7. Estimate the number of storage vessels likely to have VOC emissions greater than 6 tpy that also would be subject to and controlled under State environmental regulations

The next step was to determine the number of storage vessels that would already be subject to
and controlled under S tate environmental regulations. It was assumed that storage vessels subject to State regulations would not b e subject to the NSPS. The environmental regulations in the 11 States that represented 95 percent of the total production of crude oil and condensateTable4.AverageOilandCondensateProductionandEmissionsperProductionRateBracketOilWells CondensateWellsOilProductionRateperOilWell(bbl/day)aCrudeOilStorageVesselVOCEmissions CondensateProductionRateperGasWell(bbl/day)aCondensateStorageVesselVOCEmissions2006 2007 2008 2009 Average (tpy) 2006 2007 2008 2009 Average (tpy)0‐1 0.395 0.372 0.380 0.394 0.385 0.083 0.0175 0.0184 0.0213 0.0159 0.0183 0.0381‐2 1.34 1.32 1.34 1.34 1.34 0.287 0.0792 0.0696 0.0912 0.0809 0.0802 0.1682‐4 2.63 2.67 2.66 2.68 2.66 0.570 0.148 0.165 0.155 0.140 0.152 0.3184‐6 4.52 4.46 4.43 4.37 4.45 0.953 0.269 0.307 0.256 0.264 0.274 0.5736‐8 6.28 6.25 6.17 6.20 6.22 1.33 0.406 0.322 0.440 0.409 0.394 0.8258‐10 8.10 8.08 8.03 8.13 8.08 1.73 0.448 0.461 0.548 0.539 0.499 1.0410‐12 9.84 9.81 9.85 9.84 9.83 2.11 0.633 0.670 0.624 0.694 0.655 1.3712‐15 12.2 12.1 12.1 11.9 12.1 2.59 0.675 0.725 0.709 0.824 0.733 1.5315‐20 15.5 15.4 15.4 15.4 15.4 3.31 1.19 0.883 0.917 1.02 1.00 2.1020‐25 19.7 20.0 20.2 19.7 19.9 4.27 1.74 1.49 1.51 1.60 1.59 3.3225‐30 24.7 24.7 24.0 24.0 24.3 5.22 1.79 1.94 1.92 1.69 1.84 3.8530‐40 31.0 30.0 30.4 30.6 30.5 6.54 2.39 2.38 2.55 2.88 2.55 5.3340‐50 39.2 39.5 39.5 38.6 39.2 8.41 3.87 3.34 4.08 3.22 3.63 7.5950‐100 60.8 62.2 60.2 63.1 61.6 13.2 5.21 6.17 5.23 5.79 5.60 11.7100‐200 120 120 119 120 120 25.6 13.1 12.7 11.7 11.0 12.1 25.4200‐400 242 242 232 236 238 51.0 24.2 25.1 23.3 22.6 23.8 49.8400‐800 442 460 462 459 456 97.7 46.0 47.7 42.8 40.0 44.1 92.3800‐1600 995 916 826 919 914 196 72.7 64.7 73.0 61.3 67.9 1421600‐3200 1,771 1,662 1,618 1,719 1,692 363 156 141 139 158 148 3113200‐6400 3,001 3,123 3,738 3,551 3,353 719 222 208 262 244 234 4906400‐12800 5,736 6,495 8,501 6,569 6,825 1,464 733 604 603 1,625 891 1,864>12800c00000 000000 0aOilandcondensateproductionratespublishedbyEIA.“USTotalDistributionofWellsbyProductionRateBracket.”ftp://www.eia.doe.gov/pub/oil_gas/petrosystem/us_table.html(seeAttachment1).bOilstoragevesselVOCemissionfactor=0.214tpyVOC/bbl/day.CondensatestoragevesselVOCemissionfactor=2.09tpy/bbl/day.(SeeReference6,EPADocketNumberEPA‐HQ‐OAR‐2010‐0505‐4550).cTherewerenonewoilandgaswellcompletionsin2009forthisratecategory.Therefore,averageproductionratesweresettozero.ProductionRateBracket(BOE/day)10Table5.NumberofOilStorageVesselsPotentiallySubjecttotheNSPS(VOCEmissionsgreaterthan6tpy)2011(08/23/2011to12/31/2011)2012201320142015(01/01/2015to10/15/2015)RateClass(BOE/day)UncontrolledVOCEmissionsperNewOilStorageVessel(tpy)aTotalNumberofNewOilStorageVesselsperRateClassbNumberofOilStorageVesselswithEmissionsgreaterthanNSPSCutoffof6tpyTotalNumberofNewOilStorageVesselsperRateClassbNumberofOilStorageVesselswithEmissionsgreaterthanNSPSCutoffof6tpyTotalNumberofNewOilStorageVesselsperRateClassbNumberofOilStorageVesselswithEmissionsgreaterthanNSPSCutoffof6tpyTotalNumberofNewOilStorageVesselsperRateClassbNumberofOilStorageVesselswithEmissionsgreaterthanNSPSCutoffof6tpyTotalNumberofNewOilStorageVesselsperRateClassbNumberofOilStorageVesselswithEmissionsgreaterthanNSPSCutoffof6tpy0‐10.0834201060113011909901‐20.28762015901690179014902‐40.570151038404080433035904‐60.953153038804110437036206‐81.33194049305230555046208‐101.731870476050505360445010‐12 2.111900483051205440451012‐15 2.592980757080408530708015‐20 3.3151601,31301,39401,47901,229020‐25 4.2751801,31701,39801,48301,232025‐30 5.2249601,26101,33801,42001,179030‐40 6.547567561,9221,9222,0402,0402,1652,1651,7981,79840‐50 8.414714711,1971,1971,2711,2711,3481,3481,1201,12050‐100 13.2 1,0151,0152,5812,5812,7392,7392,9062,9062,4142,414100‐200 25.67737731,9651,9652,0852,0852,2122,2121,8381,838200‐400 51.04504501,1441,1441,2141,2141,2891,2891,0711,071400‐800 97.7155155395395419419444444370370800‐1600 196292974747979848469691600‐3200 3639922222323242420203200‐6400 7196615151515161613136400‐12800 1,4641144 4 4 4 444>12800bN/A0 0 0 0 0 0 0 0 0 0Total 6,4723,66516,4569,31917,4649,88918,530 10,492 15,3948,718TotalnumberofnewoiltanksinstalledbetweenAugust23,2011,andOctober15,2015= 74,317TotalnumberofnewoiltankssubjecttoNSPS(VOCemissionsgreaterthan6tpy)= 42,083aUncontrolledVOCemissionspresentedinTable4.bNumberofnewstoragevesselsinstalledeachyearacrossproductionratebrackets(seeTable2).cTherearenonewstoragevesselsprojectedtobeinthisbracket11Table6.NumberofCondensateStorageVesselsPotentiallySubjecttotheNSPS(VOCEmissionsgreaterthan6tpy)2011(08/23/2011to12/31/2011)2012201320142015(01/01/2015to10/15/2015)RateClass(BOE/day)UncontrolledVOCEmissionsperNewCondensateStorageVessel(tpy)aTotalNumberofNewCondensateStorageVesselperRateClassbNumberofCondensateStorageVesselwithEmissionsgreaterthanNSPSCutoffof6tpyTotalNumberofNewCondensateStorageVesselperRateClassbNumberofCondensateStorageVesselwithEmissionsgreaterthanNSPSCutoffof6tpyTotalNumberofNewCondensateStorageVesselperRateClassbNumberofCondensateStorageVesselwithEmissionsgreaterthanNSPSCutoffof6tpyTotalNumberofNewCondensateStorageVesselperRateClassbNumberofCondensateStorageVesselwithEmissionsgreaterthanNSPSCutoffof6tpyTotalNumberofNewCondensateStorageVesselperRateClassbNumberofCondensateStorageVesselwithEmissionsgreaterthanNSPSCutoffof6tpy0‐10.038228058905470632054101‐20.168125032403010348029702‐40.318233060105590646055204‐60.573275071006610763065306‐80.82230059405520637054508‐101.041880487045305230447010‐12 1.371460378035204060348012‐15 1.532020523048605610480015‐20 2.102720703065307550646020‐25 3.322420625058206710574025‐30 3.851910492045805290452030‐40 5.333330860080009230789040‐50 7.5926826869369364464474474463663650‐100 11.79669662,4962,4962,3212,3212,6802,6802,2932,293100‐200 25.4 1,3641,3643,5243,5243,2773,2773,7843,7843,2373,237200‐400 49.89719712,5092,5092,3332,3332,6942,6942,3052,305400‐800 92.34184181,0801,0801,0051,0051,1601,160992992800‐1600 1421251253223223003003463462962961600‐3200 311252564645959696959593200‐6400 490131335353232373731316400‐12800 1,8642244 4 4 5 544>12800bN/A0 0 0 0 0 0 0 0 0 0Total 6,8164,15117,61310,727 16,3799,97518,913 11,519 16,1789,854TotalnumberofnewoiltanksinstalledbetweenAugust23,2011,andOctober15,2015= 75,899TotalnumberofnewoiltankssubjecttoNSPS(VOCemissionsgreaterthan6tpy)= 46,226aUncontrolledVOCemissionspresentedinTable4.bNumberofnewstoragevesselsinstalledeachyearacrossproductionratebrackets(seeTable3).cTherearenonewstoragevesselsprojectedtobeinthisbracket12

## 13 in the US (according to production information published by the EIA) were analyzed. These
S tates were Alaska, California, Colorado, Kansas, Louisiana, Montana, North Dakota, New Mexico, Oklahoma, Texas and Wyoming. Table 7 presents the oil and condensate production
for each of these 11 Stat es (for which data were available), as well as the percent of total production.

Table 8 presents a brief summary of the storage vessel regulations from these 11 States. Two
S tates, New Mexico and Alaska, do not have regulations specific to storage vessels. Four States (Colorado, Montana, Texas, and Wyoming) have applicability thresholds in terms of VOC emissions. The remaining five States have storage vessel regulations that are in terms of tank characteristics, such as vapor pressure, tank size, or tank contents.

Because the NSPS applicability threshold is in terms of VOC emissions, only t he States with applicability thresholds in terms of VOC emissions (Colorado, Montana, Texas, and Wyoming)
were used to determine what percent of storage vessels were already subject to and controlled
under State regulations

. We applied the distribution of storage vessel s within each production
rate bracket for each State to the total number of new storage vessels for 2009 (see
Attachment 3)

. We then calculated how many storage vessels in Colorado, Montana, Texas, and Wyoming would have VOC emissions greater than the NSPS applicability threshold of 6 tpy

. Table 9 presents a summary of this analysis. As shown in Table 9
, 30 percent of the crude oil storage vessels and 78 pe rcent of the condensate storage vessels in Colorado, Montana, Texas, and Wyoming would be subject to both the NSPS and State regulations.

In order to estimate the number of storage vessels subject to both NSPS and State regulations in States that did not have applicability thresholds in terms of VOC emissions, we assumed that
the se applicability thresholds would be equivalent to the VOC emission thresho lds in Colorado, Montana, Texas, and Wyoming. Therefore, we applied the percent of storage vessels subject to both NSPS and State regulations calculated for Colorado, Montana, Texas, and Wyoming (i.e.,
30 percent for crude oil storage vessels and 78 percen t for condensate storage vessels ) to the number of storage vessels in five States (California, Kansas, Louisiana, North Dakota, and Oklahoma) to determine the total number of storage vessels that would be subject to State regulations. This calculation is presented in Table 10

. Finally, we estimated the percent of storage vessels from all 11 States that would be subject to both State regulations and the NSPS. This calculation is presented in Table 11

. As shown in
Table 11
, 22 percent of crude oil storage ve ssels and 73 percent of condensate storage vessels in the top 11 oil and condensate producing States would be subject to both the NSPS and State regulations.

## 14 Table 7. Oil and Condensate Production by State

State 2009 Crude Oil Production (10 6 

## bbl/yr) a 

## 2009 Condensate Production (10 6 

## bbl/yr) a 

## 2009 Combined Oil and Condensate Production (10 6 

## bbl/yr) Percent of total US production Cumulative Percent of

Total US Production Percent of Total US New Oil
Wells b 

## Percent of Total US New

Gas Wells b



## TX 325 75 400 30.1% 30% 22.8% 33.2%
AK 141 94 235 17.7% 48% 0.899% 0.360%
CA 203 4 207 15.6% 63% 16.5% 0.878%
ND 78 1 79 5.94% 69% 10.4% 0.022%
LA 53 15 68 5.11% 74% 2.35% 4.49%
NM 50 11 61 4.59% 79% 14.7% 6.73%
OK 43 17 60 4.51% 83% 5.35% 5.70%
WY 35 16 51 3.83% 87% 0.86% 11.5%
KS 39 0 39 2.93% 90% 0.000% 3.54%
CO 16 13 29 2.18% 92% 19.6% 12.7%
MT 28 0 28 2.11% 95% 0.578% 1.70% Subtotal 1,011 246 1,257 94.51% 94% 81%
MS 23 1 24 1.80% 96% 0% 0%
UT 19 4 23 1.73% 98% 4.54% 3.11%
AL 5 2 7 0.526% 99% 0% 1.07%
MI 5 1 6 0.451% 99% 0% 0%
AR 5 0 5 0.376% 99% 0% 7.57%
OH 3 1 4 0.301% 100% 0% 0%
SD 1 1 2 0.150% 100% 0% 0%
WV 1 0 1 0.075% 100% 0% 0%

FL 1 0 1 0.075% 100% 0% 0%
NE 0 0 0 0% 100% 0% 0%
NV 0 0 0 0% 100% 0% 0%
NY 0 0 0 0% 100% 0% 0%
MO 0 0 0 0% 100% 0% 0%
PA 0 0 0 0% 100% 0% 2.69%
AZ 0 0 0 0% 100% 0% 0%
VA 0 0 0 0% 100% 0% 3.79%
MD 0 0 0 0% 100% 0% 0%
OR 0 0 0 0% 100% 0% 0% Total 1,074 256 1,330 100% 100% 100%

a 

### Historical oil and condensate production data published by EIA up until 2009. "Distribution and Production of Oil and Gas Wells by State" http://www.eia.gov/pub/oil_gas/petrosystem/petrosysog.html

b 

### Percent of total US new oil and gas wells within each State calculated from data in HPDI. See Attachments 1 and 3.

## 15 Table 8

. Brief Summary of Storage Vessel Regulations in Top 11 Producing States

State/Local Authority a 

## Applicability Threshold
Texas Applies to storage vessels with total VOC emissions greater than 25 tpy Alaska none found California Bay Area AQMD Applies to storage vessels with capacity greater than 264 gallons California Feather River AQMD Applies to storage vessels with capacity greater than 39,630 gallons California Monterey Bay Unified APCD Applies to storage vessels with capacity greater than 39,630 gallons

California Sacramento Metropolitan AQMD Applies to storage vessels with capacity greater than 40,000 gallons

California San Joaquin Valley Unified APCD Applies to storage vessels with capacity greater than 1,100 gallons

California Santa Barbara County APCD Applies to all storage vessels in tank battery (including wash tanks, produced water tanks, and wastewater tanks)

California South Coast AQMD Applies to storage vessels with capacity greater than 39,630 gallons with a true vapor pressure of 0.5 psia or greater and storage vessels with a capacity greater than 19,815 with a true vapor pressure of 1.5 psia or greater California Ventura County APC D California Yolo

- Solano AQMD Applies to storage vessels with capacity greater than 40,000 gallons North Dakota NDAC 33

- 15

- 07: submerged filling requirements to control VOCs for tanks >1,000 gal. Louisiana Applies to storage vessels more than 250 gallons up to 40,000 gallons with a maximum true vapor pressure of 1.5 psia or greater New Mexico none found Oklahoma Applies to storage vessels with capacity greater than 40,000 gallons

Applies to storage vessels with capacity between 400 and 40,000 gallons

## Table 8 ( continued )



## 16 State/Local Authority a 

## Applicability Threshold Oklahoma Tulsa County Applies to storage vessels with capacity between 2,000 and 40,000 gallons located at a facility that dispenses greater than 120,000 gal/yr of gasoline or other VOCs Wyoming

– Statewide Applies to storage vessels with greater than or equal to 10 tpy VOC within 60 days of startup/modification. Wyoming

– Concentrated Development Area Applies to storage vessels with greater than or equal to 8 tpy VOC, within 60 days of startup/mo dification.

Wyoming

– Jonah

Pinedale Anticline Development Area None

Kansas Permanent fixed roof storage tanks >40,000 gallons and external floating roof storage tanks

Colorado Condensate tanks with uncontrolled VOC emissions > 20 tpy (2 tpy located at gas processing plants in ozone non

attainment areas)
Montana Applies to O&G oil or condensate storage tanks with a PTE greater than 15 tpy VOC

## 17 Table 9 . Number of Crude Oil and Condensate Storage Vessels Subject to State Regulations and NSPS (States with Applicability Thresholds in Terms of VOC Emissions)

State Crude Oil Storage Vessels Condensate Storage Vessels Total Number

of Crude Oil

Storage Vessels in State (2009) State Applicability

Threshold (tpy VOC) Number of Crude Oil Storage Vessels subject to NSPS a 

### Number of Crude Oil Storage Vessels Subject to State Regulation b 

### Total Number of Condensate Storage Vessels in State (2009) State A pplicability

Threshold (tpy VOC) Number of Condensate Storage Vessels subject to NSPS a 

### Number of Condensate Storage Vessels Subject to State

Regulation b



### CO 2,130 20 1,206 153 2,251 20 1,414 1,177
MT 63 15 53 19 301 15 11 1
TX 2,472 25 1,594 658 5,874 25 4,526 3,316
WY 93 10 44 30 2,037 10 1,085 1,001 Total 4,758 2,897 860 10,463 7,036 5,495 Percent of Storage Vessels Subject to State Regulations and NSPS in each State 30 % Percent of Storage Vessels Subject to State Regulations and NSPS in each State 78 %

a 

### Storage vessels with emissions greater than the NSPS applicability threshold (i.e., 6 tpy).
b 

### Storage vessels with emissions greater than the applicability threshold for that State (r efer to Attachment 4 for the detailed analysis ).

## 18 Table 10

. Number of Crude Oil and Condensate Storage Vessels Subject to State Regulations and NSPS (States with Applicability Thresholds in Terms of Tank Characteristics)

State Crude Oil Storage Vessels Condensate Storage Vessels Total Number of Crude Oil Storage Vessels in State (2009) Number of Crude Oil Storage Vessels

subject to NSPS a 

### Number of Crude Oil Storage Vessels Subject to State

Regulation b 

### Total Number of Condensate Storage

Vessels in State (2009) Number of Condensate Storage Vessels subject to NSPS a 

### Number of Condensate Storage Vessels Subject

to State Regulation b



### CA 1,796 841 132 155 104 70
KS a 

### 0 0 0 627 66 35
LA 256 163 37 795 715 554
ND 1,127 1,106 321 4 0 0 OK 581 330 66 1,008 646 467 Total 3,760 2,440 556 2,589 1,531 1,126

a 

### No data were available for new crude oil wells for Kansas in 2009 (see Attachment 3)

.

## 19 Table 11

. Percent of Crude Oil and Condensate Storage Vessels in Top 11 Producing States Subject to NSPS and State Regulations

State Crude Oil Storage Vessels Condensate Storage Vessels Total Number of Crude Oil Storage Vessels in State (2009) Number of Crude Oil Storage Vessels

subject to NSPS a 

### Number of Crude Oil Storage Vessels Subject to State

Regulation b 

### Total Number of Condensate Storage Vessels in State (2009) Number of Condensate Storage Vessels subject to NSPS a 

### Number of Condensate Storage Vessels Subject

to State Regulation b



### AK 98 98 0 64 61 0
CA 1,796 841 132 155 104 70
CO 2,130 1,206 153 2,251 1,414 1,177
KS 0 0 0 627 66 35
LA 256 163 37 795 715 554
MT 63 53 19 301 11 1
ND 1,127 1,106 321 4 0 0
NM 1,598 894 0 1,191 431 0
OK 581 330 66 1,008 646 467
TX 2,472 1,594 658 5,874 4,526 3,316
WY 93 44 30 2,037 1,085 1,001 Total 10,214 6,329 1,416 14,307 9,059 6,621 Percent of Crude Oil Storage Vessels in Top 11 Producing States subject to both NSPS and State Regulations 22 % Percent of Condensate Storage Vessels in Top 11 Producing States subject to both NSPS and State Regulations 73 %

a 

### Storage vessels with emissions greater than the lowest State applicability threshold (i.e., 10 tpy).
b 

### Storage vessels with emissions greater than the applicability threshold for that State (refer to Attachment 4 for the detailed analysis).

## 20 On an nationwide basis, storage vessels could be subject to other regulations, such as the national emissions standards for hazardous air pollutants (NESHAP) for oil and natural gas production (40 CFR part 63, sub par t HH), part 70 operating permit program , prevention of significant deterioration (PSD), other State regulations outside of the top 11 producing States, and voluntary reductions. These percentages were then extrapolated to the nationwide storage vessel p opulation, assuming that the same percentages of storage vessels would be subject to some sort of regulation absent the NSPS

. Attachment 4 shows the detailed calculation.

Step 8. Subtract the number of storage vessels subject to and controlled under State environmental regulations from the number storage vessels with VOC emissions greater than 6 tpy to determine the number of storage vessels that would be subject to the NSPS.

The number of storage vessels subject to State regulations, identified in Step 7, was then subtracted from the overall count of storage vessels that would be subject to the final rule. Tables 12 and 13 show the total number of new crude oil and condensate storage vessels that
would be installed and would be subject to the NSPS from August 23, 2011 (the date upon which new, modified or reconstructed storage vessels become affected facilities under the NSPS), until October 15, 2015. As shown in Table 12, approximately 36,000 new oil storage
vessels tha t would be subject to the NSPS expected to be installed during this period. This is an average of approximately 8,700 crude oil storage vessels per year, or about 720 per month. Table 13 shows that between approximately 14,000 new condensate storage vessel s subject to the NSPS are expected to be installed between August 23, 2011 and October 15, 2015. This is an average of about 3,400 condensate storage vessels per year, or about 290 per month. Attachment 5 contains a sample calculation for 2011.Table 12. Number of Oil Tanks Subject to the NSPS after Considering State Regulations a

2011 (from 08/23/2011 until 12/31/2011)

Production Rate Bracket (BOE/day) Uncontrolled VOC Emissions per New Oil Storage Vessel (tpy) Total Number of New Oil Storage Vessels

per Rate Class (see Table 2) Number of Oil Storage Vessels with Emissions greater than NSPS Cutoff

of 6 tpy (see Table 5) Number of Oil Storage Vessels Subject to State

Regulationb Number of New Oil Storage Vessels Subject to NSPSc
0 ‐ 1 0.083 42 0 0 0
1 ‐ 2 0.287 62 0 0 0
2 ‐ 4 0.570 151 0 0 0
4 ‐ 6 0.953 153 0 0 0
6 ‐ 8 1.33 194 0 0 0
8 ‐ 10 1.73 187 0 0 0
10 ‐ 12 2.11 190 0 0 0
12 ‐ 15 2.59 298 0 0 0
15 ‐ 20 3.31 516 0 0 0
20 ‐ 25 4.27 518 0 0 0
25 ‐ 30 5.22 496 0 0 0
30 ‐ 40 6.54 756 756 0 756
40 ‐ 50 8.41 471 471 0 471
50 ‐ 100 13.2 1,015 1,015 227 788
100 ‐ 200 25.6 773 773 173 600
200 ‐ 400 51.0 450 450 101 349
400 ‐ 800 97.7 155 155 35 121
800 ‐ 1600 196 29 29 7 23
1600 ‐ 3200 363 9 9 2 6
3200 ‐ 6400 719 6 6 1 4
6400 ‐ 12800 1,464 1 1 0 1

> 12800 d N/A 0 0 0 0 6,472 3,665 547 3,119
Total number of storage vessels installed = 35,806 Avg crude oil storage vessels installed per year = 8,632 Avg crude oil storage vessels installed per month = 719

a Only storage vessels installed from 08/23/2011 until 10/15/2015 that would be subject to the NSPS are included in this table.

b Calculated as 22 percent of the number of tanks with
emissions greater than 6 tpy (only for storage vessels with emissions greater than the lowest State applicability threshold of 10 tpy)

d There are no new tanks projected to be in this bracket c Number of storage vessels subject to State regulations subtracted from number of tanks with emissions greater than 6 tpy

21Table 12. Number of Oil Tanks Subject to the NSPS after Considering State Regulations a

Production Rate Bracket (BOE/day) Uncontrolled VOC Emissions per New Oil Storage Vessel (tpy)
0 ‐ 1 0.083
1 ‐ 2 0.287
2 ‐ 4 0.570
4 ‐ 6 0.953
6 ‐ 8 1.33
8 ‐ 10 1.73
10 ‐ 12 2.11
12 ‐ 15 2.59
15 ‐ 20 3.31
20 ‐ 25 4.27
25 ‐ 30 5.22
30 ‐ 40 6.54
40 ‐ 50 8.41
50 ‐ 100 13.2
100 ‐ 200 25.6
200 ‐ 400 51.0
400 ‐ 800 97.7
800 ‐ 1600 196
1600 ‐ 3200 363
3200 ‐ 6400 719
6400 ‐ 12800 1,464

> 12800 d N/A

a Only storage vessels installed from 08/23/2011 until 10/15/2015 that would be subject to the NSPS are included in this table.

b Calculated as 22 percent of the number of tanks with
emissions greater than 6 tpy (only for storage vessels with emissions greater than the lowest State applicability threshold of 10 tpy)

d There are no new tanks projected to be in this bracket c Number of storage vessels subject to State regulations subtracted from number of tanks with emissions greater than 6 tpy 2012

Total Number of New

Oil Storage Vessels

per Rate Class (see Table 2) Number of Oil Storage Vessels with Emissions greater than NSPS Cutoff

of 6 tpy (see Table 5) Number of Oil Storage Vessels Subject to State

Regulationb Number of New Oil Storage Vessels Subject to NSPS
106 0 0 0
159 0 0 0
384 0 0 0
388 0 0 0
493 0 0 0
476 0 0 0
483 0 0 0
757 0 0 0 1,313 0 0 0 1,317 0 0 0 1,261 0 0 0 1,922 1,922 0 1,922 1,197 1,197 0 1,197 2,581 2,581 578 2,003 1,965 1,965 440 1,525 1,144 1,144 256 888
395 395 89 306
74 74 17 57
22 22 5 17
15 15 4 11
4 4 13
0 0 00 16,456 9,319 1,390 7,929

22Table 12. Number of Oil Tanks Subject to the NSPS after Considering State Regulations a

Production Rate Bracket (BOE/day) Uncontrolled VOC Emissions per New Oil Storage Vessel (tpy)
0 ‐ 1 0.083
1 ‐ 2 0.287
2 ‐ 4 0.570
4 ‐ 6 0.953
6 ‐ 8 1.33
8 ‐ 10 1.73
10 ‐ 12 2.11
12 ‐ 15 2.59
15 ‐ 20 3.31
20 ‐ 25 4.27
25 ‐ 30 5.22
30 ‐ 40 6.54
40 ‐ 50 8.41
50 ‐ 100 13.2
100 ‐ 200 25.6
200 ‐ 400 51.0
400 ‐ 800 97.7
800 ‐ 1600 196
1600 ‐ 3200 363
3200 ‐ 6400 719
6400 ‐ 12800 1,464

> 12800 d N/A

a Only storage vessels installed from 08/23/2011 until 10/15/2015 that would be subject to the NSPS are included in this table.

b Calculated as 22 percent of the number of tanks with
emissions greater than 6 tpy (only for storage vessels with emissions greater than the lowest State applicability threshold of 10 tpy)

d There are no new tanks projected to be in this bracket c Number of storage vessels subject to State regulations subtracted from number of tanks with emissions greater than 6 tpy 2013

Total Number of New

Oil Storage Vessels

per Rate Class (see Table 2) Number of Oil Storage Vessels with Emissions greater than NSPS Cutoff

of 6 tpy (see Table 5) Number of Oil Storage Vessels Subject to State

Regulationb Number of New Oil Storage Vessels Subject to NSPS
113 0 0 0
169 0 0 0
408 0 0 0
411 0 0 0
523 0 0 0
505 0 0 0
512 0 0 0
804 0 0 0 1,394 0 0 0 1,398 0 0 0 1,338 0 0 0 2,040 2,040 0 2,040 1,271 1,271 0 1,271 2,739 2,739 613 2,126 2,085 2,085 467 1,618 1,214 1,214 272 942
419 419 94 325
79 79 18 61
23 23 6 17
15 15 4 11
4 4 13
0 0 00 17,464 9,889 1,475 8,414

23Table 12. Number of Oil Tanks Subject to the NSPS after Considering State Regulations a

Production Rate Bracket (BOE/day) Uncontrolled VOC Emissions per New Oil Storage Vessel (tpy)
0 ‐ 1 0.083
1 ‐ 2 0.287
2 ‐ 4 0.570
4 ‐ 6 0.953
6 ‐ 8 1.33
8 ‐ 10 1.73
10 ‐ 12 2.11
12 ‐ 15 2.59
15 ‐ 20 3.31
20 ‐ 25 4.27
25 ‐ 30 5.22
30 ‐ 40 6.54
40 ‐ 50 8.41
50 ‐ 100 13.2
100 ‐ 200 25.6
200 ‐ 400 51.0
400 ‐ 800 97.7
800 ‐ 1600 196
1600 ‐ 3200 363
3200 ‐ 6400 719
6400 ‐ 12800 1,464

> 12800 d N/A

a Only storage vessels installed from 08/23/2011 until 10/15/2015 that would be subject to the NSPS are included in this table.

b Calculated as 22 percent of the number of tanks with
emissions greater than 6 tpy (only for storage vessels with emissions greater than the lowest State applicability threshold of 10 tpy)

d There are no new tanks projected to be in this bracket c Number of storage vessels subject to State regulations subtracted from number of tanks with emissions greater than 6 tpy 2014

Total Number of New

Oil Storage Vessels

per Rate Class (see Table 2) Number of Oil Storage Vessels with Emissions greater than NSPS Cutoff

of 6 tpy (see Table 5) Number of Oil Storage Vessels Subject to State

Regulationb Number of New Oil Storage Vessels Subject to NSPS
119 0 0 0
179 0 0 0
433 0 0 0
437 0 0 0
555 0 0 0
536 0 0 0
544 0 0 0
853 0 0 0 1,479 0 0 0 1,483 0 0 0 1,420 0 0 0 2,165 2,165 0 2,165 1,348 1,348 0 1,348 2,906 2,906 651 2,255 2,212 2,212 495 1,717 1,289 1,289 289 1,000
444 444 100 344
84 84 19 65
24 24 6 18
16 16 4 12
4 4 13
0 0 00 18,530 10,492 1,565 8,927

24Table 12. Number of Oil Tanks Subject to the NSPS after Considering State Regulations a

Production Rate Bracket (BOE/day) Uncontrolled VOC Emissions per New Oil Storage Vessel (tpy)
0 ‐ 1 0.083
1 ‐ 2 0.287
2 ‐ 4 0.570
4 ‐ 6 0.953
6 ‐ 8 1.33
8 ‐ 10 1.73
10 ‐ 12 2.11
12 ‐ 15 2.59
15 ‐ 20 3.31
20 ‐ 25 4.27
25 ‐ 30 5.22
30 ‐ 40 6.54
40 ‐ 50 8.41
50 ‐ 100 13.2
100 ‐ 200 25.6
200 ‐ 400 51.0
400 ‐ 800 97.7
800 ‐ 1600 196
1600 ‐ 3200 363
3200 ‐ 6400 719
6400 ‐ 12800 1,464

> 12800 d N/A

a Only storage vessels installed from 08/23/2011 until 10/15/2015 that would be subject to the NSPS are included in this table.

b Calculated as 22 percent of the number of tanks with
emissions greater than 6 tpy (only for storage vessels with emissions greater than the lowest State applicability threshold of 10 tpy)

d There are no new tanks projected to be in this bracket c Number of storage vessels subject to State regulations subtracted from number of tanks with emissions greater than 6 tpy 2015 (from 01/01/2015 until 10/15/2015)

Total Number of New

Oil Storage Vessels

per Rate Class (see Table 2) Number of Oil Storage Vessels with Emissions greater than NSPS Cutoff

of 6 tpy (see Table 5) Number of Oil Storage Vessels Subject to State

Regulationb Number of New Oil Storage Vessels Subject to NSPS
99 0 0 0
149 0 0 0
359 0 0 0
362 0 0 0
462 0 0 0
445 0 0 0
451 0 0 0
708 0 0 0 1,229 0 0 0 1,232 0 0 0 1,179 0 0 0 1,798 1,798 0 1,798 1,120 1,120 0 1,120 2,414 2,414 540 1,874 1,838 1,838 412 1,426 1,071 1,071 240 831
370 370 83 286
69 69 16 53
20 20 5 16
13 13 3 10
4 4 22
0 0 00 15,394 8,718 1,301 7,417

25Table 13. Number of Condensate Tanks Subject to the NSPS after Considering State Regulations a

2011 (from 08/23/2011 until 12/31/2011)

Production Rate Bracket (BOE/day) Uncontrolled VOC Emissions per Condensate Storage Vessel (tpy) Total Number of New Condensate Storage Vessel per Rate Class (see Table 3) Number of Condensate Storage Vessels with
Emissions greater than

NSPS Cutoff of 6 tpy (see Table 6) Number of Condensate Storage Vessels Subject to
State Regulation b Number of New Condensate Storage Vessels Subject to NSPS c

0 ‐ 1 0.038 228 0 0 0
1 ‐ 2 0.168 125 0 0 0
2 ‐ 4 0.318 233 0 0 0
4 ‐ 6 0.573 275 0 0 0
6 ‐ 8 0.825 230 0 0 0
8 ‐ 10 1.04 188 0 0 0
10 ‐ 12 1.37 146 0 0 0
12 ‐ 15 1.53 202 0 0 0
15 ‐ 20 2.10 272 0 0 0
20 ‐ 25 3.32 242 0 0 0
25 ‐ 30 3.85 191 0 0 0
30 ‐ 40 5.33 333 0 0 0
40 ‐ 50 7.59 268 268 0 268
50 ‐ 100 11.7 966 966 706 260
100 ‐ 200 25.4 1,364 1,364 997 367
200 ‐ 400 49.8 971 971 710 261
400 ‐ 800 92.3 418 418 306 112
800 ‐ 1600 142 125 125 92 33
1600 ‐ 3200 311 25 25 18 6
3200 ‐ 6400 490 13 13 10 3
6400 ‐ 12800 1,864 2 2 1 0

> 12800 b N/A 0 0 0 0
6,816 4,151 2,839 1,312
Total number of storage vessels installed = 14,145 Avg condensate storage vessels installed per year = 3,410 Avg condensate storage vessels installed per month = 284

a Only storage vessels installed from 08/23/2011 until 10/15/2015 that would be subject to the NSPS are included in this table.

b Calculated as 73 percent of the number of tanks with emissions greater than 6 tpy (only for storage vessels with emissions greater than the lowest State applicability threshold of 10 tpy)

c Number of storage vessels subject to State regulations subtracted from number of tanks with
emissions greater than 6 tpy

d There are no new tanks projected to be in this bracket

26Table 13. Number of Condensate Tanks Subject to the NSPS after Considering State Regulations a

Production Rate Bracket (BOE/day) Uncontrolled VOC Emissions per Condensate Storage Vessel (tpy)
0 ‐ 1 0.038
1 ‐ 2 0.168
2 ‐ 4 0.318
4 ‐ 6 0.573
6 ‐ 8 0.825
8 ‐ 10 1.04
10 ‐ 12 1.37
12 ‐ 15 1.53
15 ‐ 20 2.10
20 ‐ 25 3.32
25 ‐ 30 3.85
30 ‐ 40 5.33
40 ‐ 50 7.59
50 ‐ 100 11.7
100 ‐ 200 25.4
200 ‐ 400 49.8
400 ‐ 800 92.3
800 ‐ 1600 142
1600 ‐ 3200 311
3200 ‐ 6400 490
6400 ‐ 12800 1,864

> 12800 b N/A

a Only storage vessels installed from 08/23/2011 until 10/15/2015 that would be subject to the NSPS are included in this table.

b Calculated as 73 percent of the number of tanks with emissions greater than 6 tpy (only for storage vessels with emissions greater than the lowest State applicability threshold of 10 tpy)

c Number of storage vessels subject to State regulations subtracted from number of tanks with
emissions greater than 6 tpy

d There are no new tanks projected to be in this bracket 2012

Total Number of New Condensate Storage Vessel per Rate Class (see Table 3) Number of Condensate Storage Vessels with
Emissions greater than

NSPS Cutoff of 6 tpy (see Table 6) Number of Condensate Storage Vessels Subject to
State Regulation b Number of New Condensate Storage Vessels Subject to NSPS c

589 0 0 0
324 0 0 0
601 0 0 0
710 0 0 0
594 0 0 0
487 0 0 0
378 0 0 0
523 0 0 0
703 0 0 0
625 0 0 0
492 0 0 0
860 0 0 0
693 693 0 693 2,496 2,496 1,825 671 3,524 3,524 2,576 948 2,509 2,509 1,834 675 1,080 1,080 790 290
322 322 236 86
64 64 47 17
35 35 26 9
4 4 31
0 0 00
17,613 10,727 7,337 3,390

27Table 13. Number of Condensate Tanks Subject to the NSPS after Considering State Regulations a

Production Rate Bracket (BOE/day) Uncontrolled VOC Emissions per Condensate Storage Vessel (tpy)
0 ‐ 1 0.038
1 ‐ 2 0.168
2 ‐ 4 0.318
4 ‐ 6 0.573
6 ‐ 8 0.825
8 ‐ 10 1.04
10 ‐ 12 1.37
12 ‐ 15 1.53
15 ‐ 20 2.10
20 ‐ 25 3.32
25 ‐ 30 3.85
30 ‐ 40 5.33
40 ‐ 50 7.59
50 ‐ 100 11.7
100 ‐ 200 25.4
200 ‐ 400 49.8
400 ‐ 800 92.3
800 ‐ 1600 142
1600 ‐ 3200 311
3200 ‐ 6400 490
6400 ‐ 12800 1,864

> 12800 b N/A

a Only storage vessels installed from 08/23/2011 until 10/15/2015 that would be subject to the NSPS are included in this table.

b Calculated as 73 percent of the number of tanks with emissions greater than 6 tpy (only for storage vessels with emissions greater than the lowest State applicability threshold of 10 tpy)

c Number of storage vessels subject to State regulations subtracted from number of tanks with
emissions greater than 6 tpy

d There are no new tanks projected to be in this bracket 2013

Total Number of New Condensate Storage Vessel per Rate Class (see Table 3) Number of Condensate Storage Vessels with
Emissions greater than

NSPS Cutoff of 6 tpy (see Table 6) Number of Condensate Storage Vessels Subject to
State Regulation b Number of New Condensate Storage Vessels Subject to NSPS c

432 0 0 0
238 0 0 0
441 0 0 0
522 0 0 0
436 0 0 0
357 0 0 0
278 0 0 0
383 0 0 0
515 0 0 0
459 0 0 0
361 0 0 0
631 0 0 0
508 508 0 508 1,831 1,831 1,339 492 2,586 2,586 1,890 696 1,841 1,841 1,345 496
793 793 580 213
237 237 174 63
47 47 35 12
25 25 19 6
3 3 21
0 0 00
12,924 7,871 5,384 2,487

28Table 13. Number of Condensate Tanks Subject to the NSPS after Considering State Regulations a

Production Rate Bracket (BOE/day) Uncontrolled VOC Emissions per Condensate Storage Vessel (tpy)
0 ‐ 1 0.038
1 ‐ 2 0.168
2 ‐ 4 0.318
4 ‐ 6 0.573
6 ‐ 8 0.825
8 ‐ 10 1.04
10 ‐ 12 1.37
12 ‐ 15 1.53
15 ‐ 20 2.10
20 ‐ 25 3.32
25 ‐ 30 3.85
30 ‐ 40 5.33
40 ‐ 50 7.59
50 ‐ 100 11.7
100 ‐ 200 25.4
200 ‐ 400 49.8
400 ‐ 800 92.3
800 ‐ 1600 142
1600 ‐ 3200 311
3200 ‐ 6400 490
6400 ‐ 12800 1,864

> 12800 b N/A

a Only storage vessels installed from 08/23/2011 until 10/15/2015 that would be subject to the NSPS are included in this table.

b Calculated as 73 percent of the number of tanks with emissions greater than 6 tpy (only for storage vessels with emissions greater than the lowest State applicability threshold of 10 tpy)

c Number of storage vessels subject to State regulations subtracted from number of tanks with
emissions greater than 6 tpy

d There are no new tanks projected to be in this bracket 2014

Total Number of New Condensate Storage Vessel per Rate Class (see Table 3) Number of Condensate Storage Vessels with
Emissions greater than

NSPS Cutoff of 6 tpy (see Table 6) Number of Condensate Storage Vessels Subject to
State Regulation b Number of New Condensate Storage Vessels Subject to NSPS c

614 0 0 0
338 0 0 0
628 0 0 0
741 0 0 0
619 0 0 0
508 0 0 0
395 0 0 0
545 0 0 0
733 0 0 0
652 0 0 0
514 0 0 0
897 0 0 0
723 723 0 723 2,604 2,604 1,904 701 3,677 3,677 2,688 989 2,618 2,618 1,913 705 1,127 1,127 824 303
336 336 246 90
67 67 50 17
36 36 27 9
5 5 41
0 0 00
18,378 11,193 7,655 3,538

29Table 13. Number of Condensate Tanks Subject to the NSPS after Considering State Regulations a

Production Rate Bracket (BOE/day) Uncontrolled VOC Emissions per Condensate Storage Vessel (tpy)
0 ‐ 1 0.038
1 ‐ 2 0.168
2 ‐ 4 0.318
4 ‐ 6 0.573
6 ‐ 8 0.825
8 ‐ 10 1.04
10 ‐ 12 1.37
12 ‐ 15 1.53
15 ‐ 20 2.10
20 ‐ 25 3.32
25 ‐ 30 3.85
30 ‐ 40 5.33
40 ‐ 50 7.59
50 ‐ 100 11.7
100 ‐ 200 25.4
200 ‐ 400 49.8
400 ‐ 800 92.3
800 ‐ 1600 142
1600 ‐ 3200 311
3200 ‐ 6400 490
6400 ‐ 12800 1,864

> 12800 b N/A

a Only storage vessels installed from 08/23/2011 until 10/15/2015 that would be subject to the NSPS are included in this table.

b Calculated as 73 percent of the number of tanks with emissions greater than 6 tpy (only for storage vessels with emissions greater than the lowest State applicability threshold of 10 tpy)

c Number of storage vessels subject to State regulations subtracted from number of tanks with
emissions greater than 6 tpy

d There are no new tanks projected to be in this bracket 2015 (from 01/01/2015 until 10/15/2015)

Total Number of New Condensate Storage Vessel per Rate Class (see Table 3) Number of Condensate Storage Vessels with
Emissions greater than

NSPS Cutoff of 6 tpy (see Table 6) Number of Condensate Storage Vessels Subject to
State Regulation b Number of New Condensate Storage Vessels Subject to NSPS c

674 0 0 0
371 0 0 0
688 0 0 0
814 0 0 0
679 0 0 0
558 0 0 0
433 0 0 0
599 0 0 0
805 0 0 0
716 0 0 0
564 0 0 0
984 0 0 0
793 793 465 328 2,858 2,858 2,089 769 4,035 4,035 2,949 1,086 2,873 2,873 2,100 773 1,237 1,237 905 332
369 369 270 99
74 74 54 20
39 39 29 10
5 5 41
0 0 00
20,168 12,284 8,866 3,418

30

## ATTACHMENT 1

US Distribution of Wells by Production Rate BracketHome > Petroleum > Distribution and Production of Oil and Gas Wells by State > United States Total Distribution of Wells by Production Rate Bracket 

# United States Total 2009

Distribution of Wells by Production Rate Bracket

Oil Wells Gas Wells
Prod. Rate Bracket (BOE/Day) | | | | # of Oil Wells % of Oil Wells Annual Oil Prod. (MMbbl) % of Oil Prod. Oil Rate per Well (bbl/Day) Annual Gas Prod. (Bcf) Gas Rate per Well (Mcf/Day) | | | | # of Gas Wells % of Gas Wells Annual Gas Prod. (Bcf) % of Gas Prod. Gas Rate per Well (Mcf/Day) Annual Oil Prod. (MMbbl) Oil Rate per Well (bbl/Day) 0 - 1 | 127,734 35.1 15.4 0.9 0.4 4.8 0.1 | 91,005 19.7 73.4 0.3 2.4 0.7 0.0 1 - 2 | 45,649 12.6 21.8 1.3 1.4 9.5 0.6 | 45,034 9.8 131.1 0.5 8.3 1.3 0.1 2 - 4 | 47,803 13.2 45.3 2.8 2.7 22.3 1.3 | 60,930 13.2 358.3 1.5 16.6 3.6 0.2 4 - 6 | 27,625 7.6 43.6 2.7 4.4 29.4 3.0 | 43,009 9.3 428.4 1.8 28.0 4.4 0.3 6 - 8 | 21,816 6.0 48.3 2.9 6.2 36.7 4.7 | 32,564 7.1 457.8 1.9 39.4 4.5 0.4 8 - 10 | 15,482 4.3 42.9 2.6 7.7 40.0 7.2 | 24,829 5.4 451.1 1.9 50.8 4.3 0.5 Subtotal <=10 | 286,109 78.7 217.3 13.2 2.2 142.7 1.4 | 297,371 64.5 1,900.0 7.9 18.3 18.8 0.2 10 - 12 | 12,642 3.5 43.8 2.7 9.7 33.5 7.4 | 18,967 4.1 420.5 1.8 62.1 4.1 0.6 12 - 15 | 11,801 3.2 50.3 3.1 11.9 37.3 8.8 | 21,718 4.7 591.1 2.5 76.2 5.7 0.7 Subtotal <=15 | 310,552 85.4 311.5 19.0 2.9 213.6 2.0 | 338,056 73.3 2,911.7 12.2 24.6 28.6 0.2 15 - 20 | 13,895 3.8 75.1 4.6 15.2 60.8 12.3 | 23,974 5.2 841.3 3.5 98.5 7.7 0.9 20 - 25 | 8,157 2.2 56.6 3.4 19.6 46.2 16.1 | 16,539 3.6 744.2 3.1 126.5 7.5 1.3 25 - 30 | 6,276 1.7 52.3 3.2 23.7 46.5 21.1 | 11,638 2.5 644.9 2.7 156.7 5.1 1.2 30 - 40 | 7,207 2.0 75.3 4.6 30.0 69.0 27.5 | 16,083 3.5 1,122.3 4.7 197.4 9.5 1.7 40 - 50 | 3,684 1.0 49.0 3.0 39.1 42.1 33.5 | 9,959 2.2 895.6 3.7 255.6 7.1 2.0 50 - 100 | 7,934 2.2 159.7 9.7 59.4 171.4 63.7 | 22,546 4.9 3,156.6 13.2 402.7 22.4 2.9 100 - 200 | 3,070 0.8 119.1 7.3 118.3 115.9 115.1 | 13,444 2.9 3,520.4 14.7 782.4 30.8 6.8 200 - 400 | 1,469 0.4 109.9 6.7 233.9 122.3 260.3 | 5,528 1.2 2,572.2 10.7 1,545.1 22.3 13.4 400 - 800 | 663 0.2 92.3 5.6 447.9 128.5 623.6 | 2,038 0.4 1,708.3 7.1 3,007.9 22.2 39.0 800 - 1600 | 264 0.1 77.8 4.7 900.8 114.4 1,325.0 | 816 0.2 1,342.4 5.6 6,039.3 25.0 112.6 1600 - 3200 | 145 0.0 86.8 5.3 1,770.4 121.8 2,485.6 | 460 0.1 1,633.2 6.8 11,907.5 35.8 261.0 3200 - 6400 | 66 0.0 88.1 5.4 3,950.0 92.9 4,167.6 | 247 0.1 1,913.3 8.0 22,917.6 46.1 552.0 6400 - 12800 | 47 0.0 112.4 6.8 7,428.9 132.1 8,729.2 | 51 0.0 725.3 3.0 46,468.5 9.9 635.0

> 12800 | 30 0.0 176.5 10.7 18,162.2 136.8 14,083.1 | 9 0.0 227.5 0.9 84,081.9 3.3 1,204.3

Total | 363,459 100.0 1,642.3 100.0 12.9 1,614.4 12.7 | 461,388 100.0 23,959.1 100.0 148.5 283.2 1.8

Notes: 1) State Government agencies and commercial sources provided base data. 2) This U.S. total does not include pre-2003 oil wells from NY, post-2004 wells from PA, 2009 wells from KY, most post-2005 TN wells, and all wells from IL and IN. 3) The Reserves and Production Division, Office of Oil and Gas, EIA has reviewed and edited inaccurate production data. 4) To be consistent between states a GOR of 6,000 (cf/bbl) for each years production was used to classify wells. If the GOR was less than 6,000 (cf/bbl) the well was classed an oil well, greater than or equal 6,000 (cf/bbl) were gas we lls. 5) To determine production rate brackets for the first and last year of a wells life the annual production was divided by the number of days in the productive months. For other years the annual production was divided by 365 or 366 days. 6) Gas volumes have been converted from the various state pressure bases to the Federal base (14.73 psia).

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# United States Total 2008

Distribution of Wells by Production Rate Bracket

Oil Wells Gas Wells
Prod. Rate Bracket (BOE/Day) | | | | # of Oil Wells % of Oil Wells Annual Oil Prod. (MMbbl) % of Oil Prod. Oil Rate per Well (bbl/Day) Annual Gas Prod. (Bcf) Gas Rate per Well (Mcf/Day) | | | | # of Gas Wells % of Gas Wells Annual Gas Prod. (Bcf) % of Gas Prod. Gas Rate per Well (Mcf/Day) Annual Oil Prod. (MMbbl) Oil Rate per Well (bbl/Day) 0 - 1 | 129,760 35.2 15.8 1.0 0.3 4.9 0.1 | 102,698 21.3 78.5 0.3 2.2 0.7 0.0 1 - 2 | 45,543 12.3 22.1 1.5 1.4 9.5 0.6 | 48,363 10.0 143.4 0.6 8.3 1.4 0.1 2 - 4 | 48,890 13.2 46.7 3.1 2.7 22.7 1.3 | 63,897 13.3 378.1 1.6 16.6 3.7 0.2 4 - 6 | 27,976 7.6 44.5 2.9 4.4 29.1 2.9 | 44,401 9.2 444.3 1.9 28.0 4.3 0.3 6 - 8 | 20,663 5.6 45.8 3.0 6.2 34.1 4.6 | 33,061 6.9 466.9 2.0 39.6 4.3 0.4 8 - 10 | 17,214 4.7 47.2 3.1 7.6 45.8 7.4 | 24,957 5.2 452.6 1.9 50.8 4.3 0.5 Subtotal <=10 | 290,046 78.6 222.2 14.7 2.1 146.1 1.4 | 317,377 65.8 1,963.9 8.2 17.4 18.7 0.2 10 - 12 | 12,627 3.4 44.0 2.9 9.7 32.7 7.2 | 19,395 4.0 430.5 1.8 62.3 4.1 0.6 12 - 15 | 12,236 3.3 52.0 3.4 11.9 37.6 8.6 | 21,272 4.4 577.2 2.4 76.5 5.2 0.7 Subtotal <=15 | 314,909 85.3 318.1 21.1 2.8 216.4 1.9 | 358,044 74.3 2,971.6 12.5 23.4 28.0 0.2 15 - 20 | 14,036 3.8 76.2 5.0 15.4 57.6 11.6 | 24,097 5.0 837.5 3.5 98.6 7.5 0.9 20 - 25 | 8,729 2.4 60.9 4.0 19.9 48.2 15.7 | 16,136 3.3 719.4 3.0 126.6 7.0 1.2 25 - 30 | 6,389 1.7 53.3 3.5 24.1 42.7 19.2 | 11,312 2.3 616.6 2.6 156.2 5.3 1.3 30 - 40 | 7,118 1.9 72.7 4.8 30.0 65.0 26.8 | 15,166 3.1 1,033.3 4.3 197.5 9.0 1.7 40 - 50 | 4,098 1.1 53.9 3.6 39.2 43.3 31.5 | 9,910 2.1 864.5 3.6 255.3 7.4 2.2 50 - 100 | 8,167 2.2 160.2 10.6 59.1 166.0 61.3 | 22,566 4.7 3,010.4 12.6 404.5 22.6 3.0 100 - 200 | 3,082 0.8 115.5 7.6 117.9 114.4 116.8 | 14,824 3.1 3,520.4 14.8 782.4 33.1 7.4 200 - 400 | 1,349 0.4 97.0 6.4 229.3 117.3 277.2 | 6,367 1.3 2,726.2 11.4 1,549.4 23.2 13.2 400 - 800 | 692 0.2 98.9 6.5 446.2 132.5 598.1 | 2,159 0.4 1,697.2 7.1 3,010.3 23.5 41.8 800 - 1600 | 294 0.1 82.0 5.4 873.9 129.1 1,375.5 | 754 0.2 1,251.2 5.3 5,858.1 24.5 114.6 1600 - 3200 | 147 0.0 87.3 5.8 1,725.3 130.1 2,572.1 | 425 0.1 1,540.4 6.5 11,723.5 37.1 282.0 3200 - 6400 | 63 0.0 79.9 5.3 3,759.0 95.2 4,477.6 | 248 0.1 1,932.3 8.1 22,992.3 44.8 532.5 6400 - 12800 | 42 0.0 93.4 6.2 7,301.6 102.9 8,045.8 | 63 0.0 977.6 4.1 44,276.1 19.3 872.2

> 12800 | 13 0.0 60.8 4.0 15,461.2 50.9 12,937.3 | 5 0.0 126.7 0.5 76,859.0 3.0 1,826.8

Total | 369,128 100.0 1,510.2 100.0 11.5 1,511.6 11.6 | 482,076 100.0 23,825.2 100.0 141.4 295.1 1.8

Notes: 1) State Government agencies and commercial sources provided base data. 2) This U.S. total does not include pre-2003 oil wells from NY, post-2004 wells from PA, 2009 wells from KY, most post-2005 TN wells, and all wells from IL and IN. 3) The Reserves and Production Division, Office of Oil and Gas, EIA has reviewed and edited inaccurate production data. 4) To be consistent between states a GOR of 6,000 (cf/bbl) for each years production was used to classify wells. If the GOR was less than 6,000 (cf/bbl) the well was classed an oil well, greater than or equal 6,000 (cf/bbl) were gas we lls. 5) To determine production rate brackets for the first and last year of a wells life the annual production was divided by the number of days in the productive months. For other years the annual production was divided by 365 or 366 days. 6) Gas volumes have been converted from the various state pressure bases to the Federal base (14.73 psia).

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# United States Total 2007

Distribution of Wells by Production Rate Bracket

Oil Wells Gas Wells
Prod. Rate Bracket (BOE/Day) | | | | # of Oil Wells % of Oil Wells Annual Oil Prod. (MMbbl) % of Oil Prod. Oil Rate per Well (bbl/Day) Annual Gas Prod. (Bcf) Gas Rate per Well (Mcf/Day) | | | | # of Gas Wells % of Gas Wells Annual Gas Prod. (Bcf) % of Gas Prod. Gas Rate per Well (Mcf/Day) Annual Oil Prod. (MMbbl) Oil Rate per Well (bbl/Day) 0 - 1 | 126,018 35.2 15.4 1.0 0.3 4.6 0.1 | 89,127 20.0 74.9 0.3 2.4 0.7 0.0 1 - 2 | 43,839 12.2 21.5 1.4 1.4 8.9 0.6 | 45,421 10.2 134.4 0.6 8.3 1.4 0.1 2 - 4 | 47,166 13.2 45.1 2.9 2.7 21.7 1.3 | 59,311 13.3 350.4 1.5 16.6 3.4 0.2 4 - 6 | 27,071 7.6 43.4 2.8 4.5 27.2 2.8 | 41,528 9.3 414.5 1.8 28.0 4.0 0.3 6 - 8 | 20,576 5.7 44.9 2.9 6.1 36.9 5.0 | 31,000 7.0 435.6 1.9 39.5 4.0 0.4 8 - 10 | 15,764 4.4 43.5 2.8 7.7 42.0 7.4 | 24,118 5.4 435.5 1.9 50.9 4.0 0.5 Subtotal <=10 | 280,434 78.3 213.8 13.9 2.1 141.3 1.4 | 290,505 65.2 1,845.4 8.1 17.9 17.5 0.2 10 - 12 | 12,093 3.4 42.4 2.8 9.8 31.9 7.4 | 18,646 4.2 414.1 1.8 62.6 3.5 0.5 12 - 15 | 12,884 3.6 54.4 3.5 11.8 40.5 8.8 | 20,999 4.7 566.3 2.5 76.1 5.4 0.7 Subtotal <=15 | 305,411 85.2 310.6 20.3 2.8 213.7 2.0 | 330,150 74.1 2,825.7 12.4 24.1 26.4 0.2 15 - 20 | 12,843 3.6 70.0 4.6 15.4 51.6 11.3 | 23,001 5.2 798.5 3.5 98.6 7.0 0.9 20 - 25 | 8,874 2.5 62.3 4.1 20.0 45.8 14.7 | 15,189 3.4 674.5 3.0 126.7 6.4 1.2 25 - 30 | 5,946 1.7 50.7 3.3 24.5 37.8 18.2 | 10,654 2.4 579.3 2.6 156.6 4.8 1.3 30 - 40 | 7,963 2.2 83.7 5.5 30.4 79.5 28.8 | 14,328 3.2 973.6 4.3 197.5 8.1 1.6 40 - 50 | 3,988 1.1 53.0 3.5 39.0 45.1 33.2 | 9,133 2.0 791.8 3.5 255.6 6.6 2.1 50 - 100 | 7,813 2.2 157.6 10.3 59.9 155.8 59.3 | 20,656 4.6 2,704.7 11.9 399.8 21.6 3.2 100 - 200 | 2,878 0.8 110.5 7.2 118.6 110.7 118.8 | 13,477 3.0 3,150.5 13.9 769.5 33.1 8.1 200 - 400 | 1,379 0.4 107.1 7.0 234.9 123.5 270.8 | 5,571 1.2 2,379.7 10.5 1,540.7 22.9 14.9 400 - 800 | 668 0.2 96.3 6.3 441.6 140.1 642.9 | 2,073 0.5 1,675.2 7.4 3,013.0 24.3 43.7 800 - 1600 | 279 0.1 79.0 5.1 893.5 114.7 1,298.3 | 822 0.2 1,429.7 6.3 6,002.5 25.6 107.5 1600 - 3200 | 144 0.0 87.3 5.7 1,854.0 126.1 2,677.8 | 408 0.1 1,565.1 6.9 11,841.8 37.3 282.4 3200 - 6400 | 90 0.0 101.0 6.6 3,602.9 135.2 4,822.9 | 243 0.1 1,879.6 8.3 22,930.6 44.6 544.5 6400 - 12800 | 49 0.0 119.9 7.8 7,363.1 163.0 10,013.6 | 88 0.0 1,182.7 5.2 43,664.0 24.2 892.8

> 12800 | 9 0.0 44.5 2.9 14,192.1 53.9 17,205.7 | 3 0.0 89.7 0.4 81,903.3 3.1 2,799.4

Total | 358,334 100.0 1,533.3 100.0 12.0 1,596.6 12.5 | 445,796 100.0 22,700.4 100.0 145.8 296.0 1.9

Notes: 1) State Government agencies and commercial sources provided base data. 2) This U.S. total does not include pre-2003 oil wells from NY, post-2004 wells from PA, 2009 wells from KY, most post-2005 TN wells, and all wells from IL and IN. 3) The Reserves and Production Division, Office of Oil and Gas, EIA has reviewed and edited inaccurate production data. 4) To be consistent between states a GOR of 6,000 (cf/bbl) for each years production was used to classify wells. If the GOR was less than 6,000 (cf/bbl) the well was classed an oil well, greater than or equal 6,000 (cf/bbl) were gas we lls. 5) To determine production rate brackets for the first and last year of a wells life the annual production was divided by the number of days in the productive months. For other years the annual production was divided by 365 or 366 days. 6) Gas volumes have been converted from the various state pressure bases to the Federal base (14.73 psia).

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# United States Total 2006

Distribution of Wells by Production Rate Bracket

Oil Wells Gas Wells
Prod. Rate Bracket (BOE/Day) | | | | # of Oil Wells % of Oil Wells Annual Oil Prod. (MMbbl) % of Oil Prod. Oil Rate per Well (bbl/Day) Annual Gas Prod. (Bcf) Gas Rate per Well (Mcf/Day) | | | | # of Gas Wells % of Gas Wells Annual Gas Prod. (Bcf) % of Gas Prod. Gas Rate per Well (Mcf/Day) Annual Oil Prod. (MMbbl) Oil Rate per Well (bbl/Day) 0 - 1 | 126,267 35.4 15.5 1.0 0.3 4.6 0.1 | 86,397 20.3 72.6 0.3 2.4 0.7 0.0 1 - 2 | 42,740 12.0 21.0 1.4 1.4 8.6 0.6 | 43,322 10.2 127.9 0.6 8.3 1.2 0.1 2 - 4 | 47,273 13.3 45.3 2.9 2.7 22.0 1.3 | 56,146 13.2 329.5 1.5 16.5 3.4 0.2 4 - 6 | 27,418 7.7 43.8 2.8 4.5 26.9 2.7 | 38,460 9.1 382.4 1.8 28.0 3.8 0.3 6 - 8 | 18,793 5.3 42.0 2.7 6.2 29.2 4.3 | 29,093 6.8 406.4 1.9 39.4 4.0 0.4 8 - 10 | 14,512 4.1 40.7 2.6 7.8 33.6 6.5 | 22,611 5.3 407.7 1.9 50.9 3.7 0.5 Subtotal <=10 | 277,003 77.7 208.3 13.4 2.1 124.9 1.3 | 276,029 65.0 1,726.4 8.0 17.7 16.9 0.2 10 - 12 | 12,951 3.6 42.7 2.8 9.2 45.5 9.8 | 18,047 4.2 398.3 1.8 62.2 3.7 0.6 12 - 15 | 13,634 3.8 58.1 3.7 11.9 41.9 8.6 | 20,621 4.9 557.2 2.6 76.5 4.9 0.7 Subtotal <=15 | 303,588 85.1 309.1 19.9 2.8 212.4 2.0 | 314,697 74.1 2,681.9 12.4 24.1 25.5 0.2 15 - 20 | 13,519 3.8 74.4 4.8 15.5 52.5 10.9 | 22,928 5.4 792.8 3.7 98.5 7.4 0.9 20 - 25 | 8,428 2.4 59.3 3.8 20.0 43.1 14.5 | 14,823 3.5 659.2 3.0 127.4 5.7 1.1 25 - 30 | 5,846 1.6 50.0 3.2 24.4 35.6 17.3 | 10,561 2.5 570.4 2.6 155.9 4.9 1.3 30 - 40 | 7,209 2.0 75.6 4.9 30.2 63.4 25.3 | 13,631 3.2 926.0 4.3 197.9 7.4 1.6 40 - 50 | 4,792 1.3 62.8 4.1 38.1 60.4 36.7 | 8,753 2.1 754.9 3.5 254.2 6.9 2.3 50 - 100 | 7,687 2.2 153.6 9.9 58.9 181.0 69.4 | 19,159 4.5 2,500.6 11.6 400.3 20.2 3.2 100 - 200 | 2,969 0.8 112.5 7.3 113.4 123.1 124.1 | 11,606 2.7 2,781.3 12.9 795.1 21.5 6.1 200 - 400 | 1,335 0.4 100.8 6.5 233.2 118.2 273.3 | 5,211 1.2 2,346.6 10.9 1,549.5 21.3 14.1 400 - 800 | 601 0.2 89.3 5.8 449.3 109.9 552.8 | 1,859 0.4 1,576.5 7.3 3,043.8 23.6 45.6 800 - 1600 | 253 0.1 74.3 4.8 891.2 112.3 1,346.9 | 814 0.2 1,446.6 6.7 5,991.5 27.9 115.7 1600 - 3200 | 161 0.0 98.6 6.4 1,887.0 137.4 2,628.7 | 452 0.1 1,766.2 8.2 11,948.9 42.1 284.9 3200 - 6400 | 96 0.0 114.0 7.4 3,640.1 150.3 4,799.8 | 228 0.1 1,800.8 8.3 23,391.1 43.5 564.6 6400 - 12800 | 47 0.0 110.4 7.1 7,016.0 150.5 9,565.7 | 55 0.0 837.2 3.9 43,472.2 17.9 931.0

> 12800 | 13 0.0 66.3 4.3 13,969.7 94.5 19,918.6 | 6 0.0 174.1 0.8 81,676.2 6.3 2,954.4

Total | 356,544 100.0 1,551.0 100.0 12.2 1,644.4 13.0 | 424,783 100.0 21,615.0 100.0 145.9 282.1 1.9

Notes: 1) State Government agencies and commercial sources provided base data. 2) This U.S. total does not include pre-2003 oil wells from NY, post-2004 wells from PA, 2009 wells from KY, most post-2005 TN wells, and all wells from IL and IN. 3) The Reserves and Production Division, Office of Oil and Gas, EIA has reviewed and edited inaccurate production data. 4) To be consistent between states a GOR of 6,000 (cf/bbl) for each years production was used to classify wells. If the GOR was less than 6,000 (cf/bbl) the well was classed an oil well, greater than or equal 6,000 (cf/bbl) were gas we lls. 5) To determine production rate brackets for the first and last year of a wells life the annual production was divided by the number of days in the productive months. For other years the annual production was divided by 365 or 366 days. 6) Gas volumes have been converted from the various state pressure bases to the Federal base (14.73 psia).

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## ATTACHMENT 2

Relative Distribution of Wells within Production Rate Brackets

### 1 TO: Heather Brown and David Hendricks, EC/R Incorporated

FROM: Don Robinson, Eric Stricklin, and Tarang Mehta

DATE: March 25, 2013

RE: Liquids Production Distribution for New Oil and Gas Wells in the U.S.

The purpose of this memorandum is to document the development of crude and condensate production distributions across certain production rate categories for new oil and ga s wells completed in 2009. These distributions will be used to estimate the number of new storage tanks imp acted by the new source perf ormance standards (NSPS) for crude oil and natural gas production, transmission and distribution (40 CFR part 60, subpart OOOO). 

# Methodology
ICF used drilling permit data collected by HPDI to develop crude oil and condensate production distributions across specific rate categories for new oil and gas wells in 2009. This was done in the following three steps:

1) Query the HPDI Database for New Wells w ith a “First Date of Production” in 2009

2) Sum the Liquids Production for Twelve Consecutive Months since the “First Date of Production” in 2009

3) Plot the Summed Liquids Production in a Histogram



## HPDI Database The crude oil and condensate production data used in this analysis was gathered from drilling permit data collected by HPDI. HPDI is a data service comp any that provides data products and d ecision-support applications, which was acquired by Drilling Info, Inc. HPDI collects drilling permit data from state and local governments describing the location, operator, and production characteristics of individual well properties. Henceforth referred to as the “HPDI database,” the aggregated drilling permit data is used in this analysis to plot the distribution of crude oil and condensate production for new wells in 2009.



## 1) Query the HPDI Database for New Wells with a “First Date of Production” in 2009 In order to construct a distribution of the crude oil and condensate production from new oil and gas wells in 2009, ICF first queried the HPDI database for oil and gas wells that were marked with a “first date of production” in 2009. ICF defines gas wells in the HPDI database as wells with an average gas to liquids ratio greater than 12,500 standard cubic feet per barrel over the lifetime of the well and define s oil wells in the HPDI database as wells with an average gas to liquids ratio less than 12,500 standard cubic feet per barrel over the lifetime of the well. This analysis assumes that liquids produced from gas wells is condensate and liqui ds produced from oil wells is crude oil. Finally, not all the drilling permits are marked with a “fir st date of production.” Therefore, fo r this analysis, the number of new oil and gas wells is limited to the number of dril ling records with a “first date of production.”



## 2) Sum the Liquids Production for Twelve Consecutive Months sin ce the “First Date of Production” in 2009 Second, ICF summed the crude oil volumes for new 2009 oil wells and condensate volumes for new 2009 gas wells over 12 months since the “first date of production.” The crude oil and condensate (i.e., liquids) volumes were summed over 12 consecutive months since the “first date of production” in 2009 to make the comparison of liquids production from one well to another equivalent. For example, if an oil well was completed in March 2009, the well would have been producing in 2009 for 10 months, and if an oil well was completed in November 2009, the well would have been producing in 2009 for 2 months. It would be unfair to compare the production from these two example wells based on their production in 2009 alone. Therefore, this an alysis sums the liquids production for each oil and gas well over 12 consecutive months. For the example oil well completed in March 2009, this assumption

### 2 would entail summing the crude oil production from March 2009 to March 2010, and for the example crude oil well completed in November 2009, it would entail summing the crude oil production from November 2009 to November 2010. Finally, depending on the source of the production records containing the gas and oil production (e.g., state governments) not all the new wells in 2009 had 12 consecutive months of production records. Therefore, the number of new oil and gas wells plotted in this analysis is limited to the number of wells with production records for 12 consecutive months since the “first date of production”.



## 3) Plot the Summed Liquids Production in a Histogram ICF plotted the number of new oil wells completed in 2009 and the number of new gas wells completed in 2009 on two histograms within defined production rate brackets. ICF also developed two tables showing the number of new oil wells completed in 2009 and new gas wells completed in 2009 by state within each production rate bracket. The production rate brackets in the histograms were deve loped to align with the production rate brackets from the Energy Information Administration (EIA) “Distr ibution of Wells by Production Rate Bracket.” 1 

### The production rate brackets are defined by barrels of oil equivalent per day (BOE/day), which is based on the approximate energy released by burning one barrel of crude oil per day.

In order to develop the histograms and tables, ICF determined the BOE/day for each oil and gas well by converting the natural gas production in thousand cubic feet (Mcf) per oil or gas well to BOE and the condensate production (in barrels) per gas well to BOE. These values were converted to BOE/day using conversions from the 2013 EIA Annual Energy Outlook. For natural gas the 2013 EIA Annual Energy Outlook assumes 5.66 thousand cubic feet per BOE for natural gas and 1.35 barrels per BOE for condensate. 2



# Results
Exhibit 1 and Exhibit 2 show the production distributions for new oil and gas wells completed in 2009 respectively for the entire U.S. Exhibit 3 and Exhibit 4 show the produc tion distributions for new oil and gas wells completed in 2009 respectively by state. Exhibit 1 through Exhibit 4 include 4,672 new oil wells and 13,977 new gas wells respectively, which are new wells marked with a “first da te of production” and with 12 consecutive months of production records. According to HPDI, the total number of new oil wells and gas wells in 2009 was 4,922 and 14,930 respectively. Therefore, the hist ograms represent 94.9% and 93.6% of the national count of new oil wells and new gas wells respectively for 2009 according to HPDI. The EIA estimates the total number of development oil wells and development gas wells drilled in 2009 was 10,585 and 16,882, respectively. 3 

### Therefore, the well counts from this analysis represent 44.1% and 82.8% of the national count of new oil wells and gas wells respectively for 2009 according to the EIA. This calculated representation is due to several factors which may include:

• The wells drilled count reported by the EIA may incl ude wells that are not productive. This analysis estimates the total number of new wells including only wells with 12 months of consecutive production marked with a “first date of production”.

• Production data from the HPDI database is collected by property and not per well. Some states submit well counts for their properties. However, for those states without well counts for individual properties, ICF has assumed one well per property where there is reported oil or gas production.

• The representativeness of the HPDI database is lim ited to the state and local governments which have collected and provided data that meet the requirements of this analysis.

Although a fraction of the total number of oil and gas wells in the U.S. is represented in this analysis, the distribution of wells in each production rate bracket is as sumed to be representative for the U.S. oil and gas well population. The NSPS 40 CFR part 60, subpart OOOO ruling only uses the distribution of wells resulting from this analysis to estimate the number of new tanks impacted by the rule.

1 

### EIA (2010). United States Total 2009: Distribution of Wells by Production Rate Bracket. <www.eia.gov/pub/oil_gas/petrosystem/us_table.html>
2 

### EIA (2012) Annual Energy Outlook. < www.eia.gov/forecasts/ aeo/er/pdf/0383er(2013).pdf>
3 

### EIA (2012). Crude Oil and Natural Gas Exploratory and Development Wells. <www.eia.gov/dnav/ng/ng_enr_wellend_s1_a.htm>

### 3 Exhibit 1. Production Range Distribution for New Oil Wells in 2009

0 30 45 109 110 140 135 137 215 373 374 358 546 340 733 558 325 112 21 6 4 1 0

0 100 200 300 400 500 600 700 800 0 >0-1

1-2 2-4 4-6 6-8 8-10 10-12 12-15 15-20 20-25 25-30 30-40 40-50 50-100 100-200 200-400 400-800 800-1,600 1,600-3,200 3,200-6,400 6,400-12,800 12,800-25,600

Number of New Oil WellsBOE/day

### 4 Exhibit 2. Production Range Distribution for New Gas Wells in 2009

89 464 255 474 560 468 384 298 412 554

493 388 678 546 1969 2780 1979 852 254 50 27 3 0

0 500 1000 1500 2000 2500 3000 0 >0-1

1-2 2-4 4-6 6-8 8-10 10-12 12-15 15-20 20-25 25-30 30-40 40-50 50-100 100-200 200-400 400-800 800-1,600 1,600-3,200 3,200-6,400 6,400-12,800 12,800-25,600

Number of New Gas WellsBOE/day5Exhibit3.ProductionRangeDistributionforNewOilWellsin2009byStateProductionRange Brackets(BOE/day)New Oil Wells in 2009AK AL AR CA CO FL KS LA MI MO MS MT ND NE NM OH OK PA SD TX UT VA WY0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0>0-1 0 0 0 3 4 0 0 0 0 0 0 0 0 0 10 6 2 0 0 4 0 0 11-2 0 0 0 11 2 0 0 1 0 0 0 0 1 0 14 3 1 0 0 10 1 0 12-4 0 1 0 21 13 0 0 0 0 0 0 0 1 0 28 1 8 0 0 34 0 0 24-6 0 0 1 33 17 0 0 3 0 0 0 1 0 0 16 0 5 0 0 27 4 0 36-8 0 0 0 42 22 0 0 6 0 0 1 0 1 0 24 2 6 0 0 32 3 0 18-10 0 0 0 29 21 0 0 2 0 0 0 0 0 0 30 0 9 0 0 32 10 0 210-12 0 0 2 41 20 0 0 4 0 0 0 2 0 0 19 1 11 0 0 27 10 0 012-15 0 1 0 54 40 0 0 6 0 0 1 0 2 0 27 0 18 0 0 56 8 0 215-20 0 0 0 92 116 0 0 5 0 0 0 0 2 0 44 1 21 0 0 59 30 0 320-25 0 0 0 85 143 0 0 8 0 0 1 0 0 0 46 0 16 2 0 50 20 0 325-30 0 1 1 72 146 0 0 5 0 0 0 1 2 0 45 0 11 1 0 47 23 0 330-40 0 0 1 98 213 0 0 6 0 0 0 4 4 0 58 0 25 0 1 101 31 0 440-50 0 0 0 58 94 0 0 11 0 0 1 0 6 0 56 0 21 0 0 76 15 0 250-100 1 2 0 99 58 0 0 19 5 0 4 11 50 0 165 0 40 0 1 226 43 0 9100-200 2 2 0 33 5 0 0 23 11 0 4 6 193 0 73 0 31 0 0 162 10 0 3200-400 7 2 0 2 3 0 0 8 1 0 2 2 167 0 29 0 14 0 0 84 3 0 1400-800 16 0 0 0 0 0 0 2 0 0 0 0 54 0 4 0 4 0 0 31 1 0 0800-1600 10 0 0 0 0 0 0 0 0 0 0 0 2 0 0 0 7 0 0 2 0 0 01600-3200 3 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 2 0 0 03200-6400 3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 06400-12800 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 012800-25600 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 06Exhibit4.ProductionRangeDistributionforNewGasWellsin2009byStateProductionRange Brackets(BOE/day)New Gas Wells in 2009AK AL AR CA CO FL KS LA MI MO MS MT ND NE NM OH OK PA SD TX UT VA WY00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 89>0-10 3 2 2 25 0 25 1 0 0 0 4 1 0 26 20 11 8 0 49 5 9 2731-20 5 5 0 8 0 57 5 0 0 0 5 0 2 13 7 8 7 0 51 2 19 612-40 23 5 2 42 0 86 5 4 1 0 25 0 7 35 3 26 24 0 79 5 49 534-60 18 11 3 113 0 82 5 1 0 0 28 0 3 31 1 22 20 0 74 4 96 486-80 16 9 3 82 0 50 1 3 0 1 36 0 12 34 2 30 25 0 67 3 59 358-100 17 12 5 55 0 34 4 1 0 0 30 0 1 28 0 18 20 0 70 4 61 2410-120 14 10 2 41 0 27 0 1 0 0 14 1 0 25 1 19 16 0 50 7 37 3312-150 12 15 3 66 0 28 8 1 0 1 32 0 1 41 0 20 13 0 70 8 66 2715-200 14 23 5 66 0 25 7 1 0 2 35 1 0 89 2 33 18 1 123 5 59 4520-250 8 11 6 83 0 15 7 2 0 1 14 0 0 65 1 35 23 1 141 7 29 4425-300 4 19 9 76 0 11 4 0 0 0 2 0 0 77 0 26 8 0 93 15 10 3430-400 3 23 12 108 0 17 16 2 0 4 2 0 0 133 0 36 31 0 191 17 13 7040-500 4 21 15 78 0 7 4 1 0 1 5 0 0 93 0 38 14 0 168 25 6 6650-1002 3 122 34 310 0 16 56 9 0 7 3 0 0 166 0 112 44 0 782 118 6 179100-2005 4 250 15 554 0 6 103 0 0 10 1 0 0 39 0 147 64 0 1252 149 6 175200-4002 1 413 3 57 0 4 65 0 0 4 0 0 0 30 0 132 31 0 912 56 1 268400-8005 0 99 3 3 0 2 150 0 0 3 0 0 0 10 0 65 6 0 348 2 0 156800-16003 0 2 0 0 0 0 164 0 0 0 0 0 0 0 0 9 1 0 68 0 0 71600-320011 0 0 0 0 0 0 19 0 0 0 0 0 0 0 0 4 0 0 16 0 0 03200-640020 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6 0 0 16400-128002 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 012800-256000 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

## ATTACHMENT 3

Distribution of New Wells Identified in HPDI Database across Production Rate Brackets

- By State

## ATTACHMENT 3 Distribution of New Wells Identified in HPDI Database Across Production Rate Brackets - by State OIL WELL COMPLETIONS

Number of Oil well completions Number of Oil well completions

Production Rate Bracket (BOE/day) Nationwide AK AL AR CA CO FL KS LA MI MO MS
0 0 0 0 0 0 0 0 0 0 0 0 0
>0-1 30 0 0 0 3 4 0 0 0 0 0 0
1-2 45 0 0 0 11 2 0 0 1 0 0 0
2-4 109 0 1 0 21 13 0 0 0 0 0 0
4-6 110 0 0 1 33 17 0 0 3 0 0 0
6-8 140 0 0 0 42 22 0 0 6 0 0 1
8-10 135 0 0 0 29 21 0 0 2 0 0 0
10-12 137 0 0 2 41 20 0 0 4 0 0 0
12-15 215 0 1 0 54 40 0 0 6 0 0 1
15-20 373 0 0 0 92 116 0 0 5 0 0 0
20-25 374 0 0 0 85 143 0 0 8 0 0 1
25-30 358 0 1 1 72 146 0 0 5 0 0 0
30-40 546 0 0 1 98 213 0 0 6 0 0 0
40-50 340 0 0 0 58 94 0 0 11 0 0 1
50-100 733 1 2 0 99 58 0 0 19 5 0 4
100-200 558 2 2 0 33 5 0 0 23 11 0 4
200-400 325 7 2 0 2 3 0 0 8 1 0 2
400-800 112 16 0 0 0 0 0 0 2 0 0 0
800-1600 21 10 0 0 0 0 0 0 0 0 0 0
1600-3200 6 3 0 0 0 0 0 0 1 0 0 0
3200-6400 4 3 0 0 0 0 0 0 0 0 0 0
6400-12800 1 0 0 0 0 0 0 0 0 0 0 0
12800-25600 0 0 0 0 0 0 0 0 0 0 0 0

Total 4672 42 9 5 773 917 0 0 110 17 0 14 Percent of Nationwide wells 100% 0.90% 0.19% 0.11% 16.55% 19.63% 0.00% 0.00% 2.35% 0.36% 0.00% 0.30%

Queried from HPDI database using two criteria: wells that had a date stamp and wells that have 12 months of continuous production (See Attachment 2). It is assumed that all of the wells represented in this table are development wells, even though they may have originally been considered exploratory wells (and are labelled as such in the HPDI database)

Shaded columns highlight the top 11 oil and condensate producing States.



## Page 1

## ATTACHMENT 3 Distribution of New Wells Identified in HPDI Database Across Production Rate Brackets - by State OIL WELL COMPLETIONS

Number of Oil well completions

Production Rate Bracket (BOE/day)
0
>0-1
1-2
2-4
4-6
6-8
8-10
10-12
12-15
15-20
20-25
25-30
30-40
40-50
50-100
100-200
200-400
400-800
800-1600
1600-3200
3200-6400
6400-12800
12800-25600

Total Percent of Nationwide wells

Shaded columns highlight the top 11 oil and condensate producing States. Number of Oil well completions

MT ND NE NM OH OK PA SD TX UT VA WY
0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 10 6 2 0 0 4 0 0 1
0 1 0 14 3 1 0 0 10 1 0 1
0 1 0 28 1 8 0 0 34 0 0 2
1 0 0 16 0 5 0 0 27 4 0 3
0 1 0 24 2 6 0 0 32 3 0 1
0 0 0 30 0 9 0 0 32 10 0 2
2 0 0 19 1 11 0 0 27 10 0 0
0 2 0 27 0 18 0 0 56 8 0 2
0 2 0 44 1 21 0 0 59 30 0 3
0 0 0 46 0 16 2 0 50 20 0 3
1 2 0 45 0 11 1 0 47 23 0 3
4 4 0 58 0 25 0 1 101 31 0 4
0 6 0 56 0 21 0 0 76 15 0 2
11 50 0 165 0 40 0 1 226 43 0 9
6 193 0 73 0 31 0 0 162 10 0 3
2 167 0 29 0 14 0 0 84 3 0 1
0 54 0 4 0 4 0 0 31 1 0 0
0 2 0 0 0 7 0 0 2 0 0 0
0 0 0 0 0 0 0 0 2 0 0 0
0 0 0 0 0 0 0 0 1 0 0 0
0 0 0 0 0 0 0 0 1 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0
27 485 0 688 14 250 3 2 1064 212 0 40
0.58% 10.38% 0.00% 14.73% 0.30% 5.35% 0.06% 0.04% 22.77% 4.54% 0.00% 0.86%

Queried from HPDI database using two criteria: wells that had a date stamp and wells that have 12 months of continuous production (See Attachment 2). It is assumed that all of the wells represented in this table are development wells, even though they may have originally been considered exploratory wells (and are labelled as such in the HPDI database)

Shaded columns highlight the top 11 oil and condensate producing States.



## Page 2

## ATTACHMENT 3 Distribution of New Wells Identified in HPDI Database Across Production Rate Brackets - by State OIL WELL COMPLETIONS

Number of Gas Well Completions Number of Gas Well Completions

Production Rate Bracket (BOE/day) Nationwide AK AL AR CA CO FL KS LA MI MO MS
0 89 0 0 0 0 0 0 0 0 0 0 0
>0-1 464 0 3 2 2 25 0 25 1 0 0 0
1-2 255 0 5 5 0 8 0 57 5 0 0 0
2-4 474 0 23 5 2 42 0 86 5 4 1 0
4-6 560 0 18 11 3 113 0 82 5 1 0 0
6-8 468 0 16 9 3 82 0 50 1 3 0 1
8-10 384 0 17 12 5 55 0 34 4 1 0 0
10-12 298 0 14 10 2 41 0 27 0 1 0 0
12-15 412 0 12 15 3 66 0 28 8 1 0 1
15-20 554 0 14 23 5 66 0 25 7 1 0 2
20-25 493 0 8 11 6 83 0 15 7 2 0 1
25-30 388 0 4 19 9 76 0 11 4 0 0 0
30-40 678 0 3 23 12 108 0 17 16 2 0 4
40-50 546 0 4 21 15 78 0 7 4 1 0 1
50-100 1969 2 3 122 34 310 0 16 56 9 0 7
100-200 2780 5 4 250 15 554 0 6 103 0 0 10
200-400 1979 2 1 413 3 57 0 4 65 0 0 4
400-800 852 5 0 99 3 3 0 2 150 0 0 3
800-1600 254 3 0 2 0 0 0 0 164 0 0 0
1600-3200 50 11 0 0 0 0 0 0 19 0 0 0
3200-6400 27 20 0 0 0 0 0 0 0 0 0 0
6400-12800 3 2 0 0 0 0 0 0 0 0 0 0
12800-25600 0 0 0 0 0 0 0 0 0 0 0 0

Total 13888 50 149 1052 122 1767 0 492 624 26 1 34 Percent of Nationwide wells 100% 0.36% 1.07% 7.57% 0.88% 12.72% 0.00% 3.54% 4.49% 0.19% 0.01% 0.24%

Queried from HPDI database using two criteria: wells that had a date stamp and wells that have 12 months of continuous production (See Attachment 2). It is assumed that all of the wells represented in this table are development wells, even though they may have originally been considered exploratory wells (and are labelled as such in the HPDI database)

Shaded columns highlight the top 11 oil and condensate producing States.



## Page 3

## ATTACHMENT 3 Distribution of New Wells Identified in HPDI Database Across Production Rate Brackets - by State OIL WELL COMPLETIONS

Number of Gas Well Completions

Production Rate Bracket (BOE/day)
0
>0-1
1-2
2-4
4-6
6-8
8-10
10-12
12-15
15-20
20-25
25-30
30-40
40-50
50-100
100-200
200-400
400-800
800-1600
1600-3200
3200-6400
6400-12800
12800-25600

Total Percent of Nationwide wells Number of Gas Well Completions

MT ND NE NM OH OK PA SD TX UT VA WY
0 0 0 0 0 0 0 0 0 0 0 89
4 1 0 26 20 11 8 0 49 5 9 273
5 0 2 13 7 8 7 0 51 2 19 61
25 0 7 35 3 26 24 0 79 5 49 53
28 0 3 31 1 22 20 0 74 4 96 48
36 0 12 34 2 30 25 0 67 3 59 35
30 0 1 28 0 18 20 0 70 4 61 24
14 1 0 25 1 19 16 0 50 7 37 33
32 0 1 41 0 20 13 0 70 8 66 27
35 1 0 89 2 33 18 1 123 5 59 45
14 0 0 65 1 35 23 1 141 7 29 44
2 0 0 77 0 26 8 0 93 15 10 34
2 0 0 133 0 36 31 0 191 17 13 70
5 0 0 93 0 38 14 0 168 25 6 66
3 0 0 166 0 112 44 0 782 118 6 179
1 0 0 39 0 147 64 0 1252 149 6 175
0 0 0 30 0 132 31 0 912 56 1 268
0 0 0 10 0 65 6 0 348 2 0 156
0 0 0 0 0 9 1 0 68 0 0 7
0 0 0 0 0 4 0 0 16 0 0 0
0 0 0 0 0 0 0 0 6 0 0 1
0 0 0 0 0 0 0 0 1 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0
236 3 26 935 37 791 373 2 4611 432 526 1599
1.70% 0.02% 0.19% 6.73% 0.27% 5.70% 2.69% 0.01% 33.20% 3.11% 3.79% 11.51%

Queried from HPDI database using two criteria: wells that had a date stamp and wells that have 12 months of continuous production (See Attachment 2). It is assumed that all of the wells represented in this table are development wells, even though they may have originally been considered exploratory wells (and are labelled as such in the HPDI database)

Shaded columns highlight the top 11 oil and condensate producing States.



## Page 4

## ATTACHMENT 4

Analysis to Determine Percent of Storage Vessels Subject to State Regulation

## ATTACHMENT 4 Analysis to Determine Percent of Storage Vessels Subject to State Regulation CRUDE OIL STORAGE VESSELS

2009 Total Lower 48 Oil Wells Completions (thousands)* 10.85

Projected Number of New Oil Wells each Year by Rate Class
2009 2009

Percent of total number of wells** State Rate Class (BOE/day) Avg Throughput per Rate Category (bbl/day) VOC Emissions

per Tank (tpy) Distribution of

new wells** Total Number

of New Tanks
in State Number of

Tanks subject to
NSPS Number of

Tanks subject to
State Regulations
0.90% AK 0 - 1 0.385 0.08 0.0% 0
1 - 2 1.34 0.29 0.0% 0
2 - 4 2.66 0.57 0.0% 0
4 - 6 4.45 0.95 0.0% 0
6 - 8 6.22 1.33 0.0% 0
8 - 10 8.08 1.73 0.0% 0
10 - 12 9.83 2.11 0.0% 0
12 - 15 12.1 2.59 0.0% 0
15 - 20 15.4 3.31 0.0% 0
20 - 25 19.9 4.27 0.0% 0
25 - 30 24.3 5.22 0.0% 0
30 - 40 30.5 6.54 0.0% 0 0
40 - 50 39.2 8.41 0.0% 0 0
50 - 100 61.6 13.20 0.0% 0 0
100 - 200 120 25.64 2.4% 2 2
200 - 400 238 51.01 4.8% 5 5
400 - 800 456 97.70 16.7% 16 16
800 - 1600 914 196.01 38.1% 37 37
1600 - 3200 1692 362.91 23.8% 23 23
3200 - 6400 3353 719.14 7.1% 7 7
6400 - 12800 6825 1463.69 7.1% 7 7
> 12800 0.0 0.00 0.0% 0
1 98 98 0 16.55% CA 0 - 1 0.385 0.08 0.0% 0
1 - 2 1.34 0.29 0.4% 7
2 - 4 2.66 0.57 1.4% 26
4 - 6 4.45 0.95 2.7% 49
6 - 8 6.22 1.33 4.3% 77
8 - 10 8.08 1.73 5.4% 98
10 - 12 9.83 2.11 3.8% 67
12 - 15 12.1 2.59 5.3% 95
15 - 20 15.4 3.31 7.0% 125
20 - 25 19.9 4.27 11.9% 214
25 - 30 24.3 5.22 11.0% 197
30 - 40 30.5 6.54 9.3% 167 167
40 - 50 39.2 8.41 12.7% 228 228
50 - 100 61.6 13.20 7.5% 135 135 40
100 - 200 120 25.64 12.8% 230 230 68
200 - 400 238 51.01 4.3% 77 77 23
400 - 800 456 97.70 0.3% 5 5 1
800 - 1600 914 196.01 0.0% 0 0 0
1600 - 3200 1692 362.91 0.0% 0 0 0
3200 - 6400 3353 719.14 0.0% 0 0 0
6400 - 12800 6825 1463.69 0.0% 0 0 0
> 12800 0.0 0.00 0.0% 0
0.00 1 1,796 841 132 NO STATE REGULATIONS



## Page 1

## ATTACHMENT 4 Analysis to Determine Percent of Storage Vessels Subject to State Regulation CRUDE OIL STORAGE VESSELS

2009 Total Lower 48 Oil Wells Completions (thousands)* 10.85

Projected Number of New Oil Wells each Year by Rate Class
2009 2009

Percent of total number of wells** State Rate Class (BOE/day) Avg Throughput per Rate Category (bbl/day) VOC Emissions

per Tank (tpy) Distribution of

new wells** Total Number

of New Tanks
in State Number of

Tanks subject to
NSPS Number of

Tanks subject to
State Regulations
19.63% CO 0 - 1 0.385 0.08 0.0% 0
1 - 2 1.34 0.29 0.4% 9
2 - 4 2.66 0.57 0.2% 5
4 - 6 4.45 0.95 1.4% 30
6 - 8 6.22 1.33 1.9% 39
8 - 10 8.08 1.73 2.4% 51
10 - 12 9.83 2.11 2.3% 49
12 - 15 12.1 2.59 2.2% 46
15 - 20 15.4 3.31 4.4% 93
20 - 25 19.9 4.27 12.6% 270
25 - 30 24.3 5.22 15.6% 332
30 - 40 30.5 6.54 15.9% 339 339
40 - 50 39.2 8.41 23.2% 495 495
50 - 100 61.6 13.20 10.3% 218 218
100 - 200 120 25.64 6.3% 135 135 135
200 - 400 238 51.01 0.5% 12 12 12
400 - 800 456 97.70 0.3% 7 7 7
800 - 1600 914 196.01 0.0% 0 0 0
1600 - 3200 1692 362.91 0.0% 0 0 0
3200 - 6400 3353 719.14 0.0% 0 0 0
6400 - 12800 6825 1463.69 0.0% 0 0 0
> 12800 0.0 0.00 0.0% 0
1 2,130 1,206 153 0.00% KS 0 - 1 0.385 0.08 0.0% 0
1 - 2 1.34 0.29 0.0% 0
2 - 4 2.66 0.57 0.0% 0
4 - 6 4.45 0.95 0.0% 0
6 - 8 6.22 1.33 0.0% 0
8 - 10 8.08 1.73 0.0% 0
10 - 12 9.83 2.11 0.0% 0
12 - 15 12.1 2.59 0.0% 0
15 - 20 15.4 3.31 0.0% 0
20 - 25 19.9 4.27 0.0% 0
25 - 30 24.3 5.22 0.0% 0
30 - 40 30.5 6.54 0.0% 0 0
40 - 50 39.2 8.41 0.0% 0 0
50 - 100 61.6 13.20 0.0% 0 0 0
100 - 200 120 25.64 0.0% 0 0 0
200 - 400 238 51.01 0.0% 0 0 0
400 - 800 456 97.70 0.0% 0 0 0
800 - 1600 914 196.01 0.0% 0 0 0
1600 - 3200 1692 362.91 0.0% 0 0 0
3200 - 6400 3353 719.14 0.0% 0 0 0
6400 - 12800 6825 1463.69 0.0% 0 0 0
> 12800 0.0 0.00 0.0% 0
0.00 0 0 0 0

Page 2

## ATTACHMENT 4 Analysis to Determine Percent of Storage Vessels Subject to State Regulation CRUDE OIL STORAGE VESSELS

2009 Total Lower 48 Oil Wells Completions (thousands)* 10.85

Projected Number of New Oil Wells each Year by Rate Class
2009 2009

Percent of total number of wells** State Rate Class (BOE/day) Avg Throughput per Rate Category (bbl/day) VOC Emissions

per Tank (tpy) Distribution of

new wells** Total Number

of New Tanks
in State Number of

Tanks subject to
NSPS Number of

Tanks subject to
State Regulations
2.35% LA 0 - 1 0.385 0.08 0.0% 0
1 - 2 1.34 0.29 0.9% 2
2 - 4 2.66 0.57 0.0% 0
4 - 6 4.45 0.95 2.7% 7
6 - 8 6.22 1.33 5.5% 14
8 - 10 8.08 1.73 1.8% 5
10 - 12 9.83 2.11 3.6% 9
12 - 15 12.1 2.59 5.5% 14
15 - 20 15.4 3.31 4.5% 12
20 - 25 19.9 4.27 7.3% 19
25 - 30 24.3 5.22 4.5% 12
30 - 40 30.5 6.54 5.5% 14 14
40 - 50 39.2 8.41 10.0% 26 26
50 - 100 61.6 13.20 17.3% 44 44 13
100 - 200 120 25.64 20.9% 53 53 16
200 - 400 238 51.01 7.3% 19 19 6
400 - 800 456 97.70 1.8% 5 5 1
800 - 1600 914 196.01 0.0% 0 0 0
1600 - 3200 1692 362.91 0.9% 2 2 1
3200 - 6400 3353 719.14 0.0% 0 0 0
6400 - 12800 6825 1463.69 0.0% 0 0 0
> 12800 0.0 0.00 0.0% 0
1 256 163 37 0.58% MT 0 - 1 0.385 0.08 0.0% 0
1 - 2 1.34 0.29 0.0% 0
2 - 4 2.66 0.57 0.0% 0
4 - 6 4.45 0.95 3.7% 2
6 - 8 6.22 1.33 0.0% 0
8 - 10 8.08 1.73 0.0% 0
10 - 12 9.83 2.11 7.4% 5
12 - 15 12.1 2.59 0.0% 0
15 - 20 15.4 3.31 0.0% 0
20 - 25 19.9 4.27 0.0% 0
25 - 30 24.3 5.22 3.7% 2
30 - 40 30.5 6.54 14.8% 9 9
40 - 50 39.2 8.41 0.0% 0 0
50 - 100 61.6 13.20 40.7% 26 26
100 - 200 120 25.64 22.2% 14 14 14
200 - 400 238 51.01 7.4% 5 5 5
400 - 800 456 97.70 0.0% 0 0 0
800 - 1600 914 196.01 0.0% 0 0 0
1600 - 3200 1692 362.91 0.0% 0 0 0
3200 - 6400 3353 719.14 0.0% 0 0 0
6400 - 12800 6825 1463.69 0.0% 0 0 0
> 12800 0.0 0.00 0.0% 0
1 63 53 19

Page 3

## ATTACHMENT 4 Analysis to Determine Percent of Storage Vessels Subject to State Regulation CRUDE OIL STORAGE VESSELS

2009 Total Lower 48 Oil Wells Completions (thousands)* 10.85

Projected Number of New Oil Wells each Year by Rate Class
2009 2009

Percent of total number of wells** State Rate Class (BOE/day) Avg Throughput per Rate Category (bbl/day) VOC Emissions

per Tank (tpy) Distribution of

new wells** Total Number

of New Tanks
in State Number of

Tanks subject to
NSPS Number of

Tanks subject to
State Regulations
10.38% ND 0 - 1 0.385 0.08 0.0% 0
1 - 2 1.34 0.29 0.2% 2
2 - 4 2.66 0.57 0.2% 2
4 - 6 4.45 0.95 0.0% 0
6 - 8 6.22 1.33 0.2% 2
8 - 10 8.08 1.73 0.0% 0
10 - 12 9.83 2.11 0.0% 0
12 - 15 12.1 2.59 0.4% 5
15 - 20 15.4 3.31 0.4% 5
20 - 25 19.9 4.27 0.0% 0
25 - 30 24.3 5.22 0.4% 5
30 - 40 30.5 6.54 0.8% 9 9
40 - 50 39.2 8.41 1.2% 14 14
50 - 100 61.6 13.20 10.3% 116 116 34
100 - 200 120 25.64 39.8% 448 448 133
200 - 400 238 51.01 34.4% 388 388 115
400 - 800 456 97.70 11.1% 125 125 37
800 - 1600 914 196.01 0.4% 5 5 1
1600 - 3200 1692 362.91 0.0% 0 0 0
3200 - 6400 3353 719.14 0.0% 0 0 0
6400 - 12800 6825 1463.69 0.0% 0 0 0
> 12800 0.0 0.00 0.0% 0
1 1,127 1,106 321 14.73% NM 0 - 1 0.385 0.08 1.5% 23
1 - 2 1.34 0.29 2.0% 33
2 - 4 2.66 0.57 4.1% 65
4 - 6 4.45 0.95 2.3% 37
6 - 8 6.22 1.33 3.5% 56
8 - 10 8.08 1.73 4.4% 70
10 - 12 9.83 2.11 2.8% 44
12 - 15 12.1 2.59 3.9% 63
15 - 20 15.4 3.31 6.4% 102
20 - 25 19.9 4.27 6.7% 107
25 - 30 24.3 5.22 6.5% 105
30 - 40 30.5 6.54 8.4% 135 135
40 - 50 39.2 8.41 8.1% 130 130
50 - 100 61.6 13.20 24.0% 383 383
100 - 200 120 25.64 10.6% 170 170
200 - 400 238 51.01 4.2% 67 67
400 - 800 456 97.70 0.6% 9 9
800 - 1600 914 196.01 0.0% 0 0
1600 - 3200 1692 362.91 0.0% 0 0
3200 - 6400 3353 719.14 0.0% 0 0
6400 - 12800 6825 1463.69 0.0% 0 0
> 12800 0.0 0.00 0.0% 0
1 1,598 894 0 NO STATE REGULATIONS



## Page 4

## ATTACHMENT 4 Analysis to Determine Percent of Storage Vessels Subject to State Regulation CRUDE OIL STORAGE VESSELS

2009 Total Lower 48 Oil Wells Completions (thousands)* 10.85

Projected Number of New Oil Wells each Year by Rate Class
2009 2009

Percent of total number of wells** State Rate Class (BOE/day) Avg Throughput per Rate Category (bbl/day) VOC Emissions

per Tank (tpy) Distribution of

new wells** Total Number

of New Tanks
in State Number of

Tanks subject to
NSPS Number of

Tanks subject to
State Regulations
5.35% OK 0 - 1 0.385 0.08 0.8% 5
1 - 2 1.34 0.29 0.4% 2
2 - 4 2.66 0.57 3.2% 19
4 - 6 4.45 0.95 2.0% 12
6 - 8 6.22 1.33 2.4% 14
8 - 10 8.08 1.73 3.6% 21
10 - 12 9.83 2.11 4.4% 26
12 - 15 12.1 2.59 7.2% 42
15 - 20 15.4 3.31 8.4% 49
20 - 25 19.9 4.27 6.4% 37
25 - 30 24.3 5.22 4.4% 26
30 - 40 30.5 6.54 10.0% 58 58
40 - 50 39.2 8.41 8.4% 49 49
50 - 100 61.6 13.20 16.0% 93 93 28
100 - 200 120 25.64 12.4% 72 72 21
200 - 400 238 51.01 5.6% 33 33 10
400 - 800 456 97.70 1.6% 9 9 3
800 - 1600 914 196.01 2.8% 16 16 5
1600 - 3200 1692 362.91 0.0% 0 0 0
3200 - 6400 3353 719.14 0.0% 0 0 0
6400 - 12800 6825 1463.69 0.0% 0 0 0
> 12800 0.0 0.00 0.0% 0
1 581 330 66 22.77% TX 0 - 1 0.385 0.08 0.4% 9
1 - 2 1.34 0.29 0.9% 23
2 - 4 2.66 0.57 3.2% 79
4 - 6 4.45 0.95 2.5% 63
6 - 8 6.22 1.33 3.0% 74
8 - 10 8.08 1.73 3.0% 74
10 - 12 9.83 2.11 2.5% 63
12 - 15 12.1 2.59 5.3% 130
15 - 20 15.4 3.31 5.5% 137
20 - 25 19.9 4.27 4.7% 116
25 - 30 24.3 5.22 4.4% 109
30 - 40 30.5 6.54 9.5% 235 235
40 - 50 39.2 8.41 7.1% 177 177
50 - 100 61.6 13.20 21.2% 525 525
100 - 200 120 25.64 15.2% 376 376 376
200 - 400 238 51.01 7.9% 195 195 195
400 - 800 456 97.70 2.9% 72 72 72
800 - 1600 914 196.01 0.2% 5 5 5
1600 - 3200 1692 362.91 0.2% 5 5 5
3200 - 6400 3353 719.14 0.1% 2 2 2
6400 - 12800 6825 1463.69 0.1% 2 2 2
> 12800 0.0 0.00 0.0% 0
1 2,472 1,594 658

Page 5

## ATTACHMENT 4 Analysis to Determine Percent of Storage Vessels Subject to State Regulation CRUDE OIL STORAGE VESSELS

2009 Total Lower 48 Oil Wells Completions (thousands)* 10.85

Projected Number of New Oil Wells each Year by Rate Class
2009 2009

Percent of total number of wells** State Rate Class (BOE/day) Avg Throughput per Rate Category (bbl/day) VOC Emissions

per Tank (tpy) Distribution of

new wells** Total Number

of New Tanks
in State Number of

Tanks subject to
NSPS Number of

Tanks subject to
State Regulations
0.86% WY 0 - 1 0.385 0.08 2.5% 2
1 - 2 1.34 0.29 2.5% 2
2 - 4 2.66 0.57 5.0% 5
4 - 6 4.45 0.95 7.5% 7
6 - 8 6.22 1.33 2.5% 2
8 - 10 8.08 1.73 5.0% 5
10 - 12 9.83 2.11 0.0% 0
12 - 15 12.1 2.59 5.0% 5
15 - 20 15.4 3.31 7.5% 7
20 - 25 19.9 4.27 7.5% 7
25 - 30 24.3 5.22 7.5% 7
30 - 40 30.5 6.54 10.0% 9 9
40 - 50 39.2 8.41 5.0% 5 5
50 - 100 61.6 13.20 22.5% 21 21 21
100 - 200 120 25.64 7.5% 7 7 7
200 - 400 238 51.01 2.5% 2 2 2
400 - 800 456 97.70 0.0% 0 0 0
800 - 1600 914 196.01 0.0% 0 0 0
1600 - 3200 1692 362.91 0.0% 0 0 0
3200 - 6400 3353 719.14 0.0% 0 0 0
6400 - 12800 6825 1463.69 0.0% 0 0 0
> 12800 0.0 0.00 0.0% 0
1 93 44 30

10,213 ** See Attachments 2 and 3 for distribution and percent of wells within each State



## 2,897 860

Percent of regulated States 

## 30%

6329 1416 Percent of regulated States 

## 22%

Sum of the number of tanks with non-emission related cutoffs 

## 2,439 556 Sum of the number of tanks with emissions greater than the NSPS Cutoff and in states with TPY-type cutoffs

Percent of all tanks that are subject to State Regulations (above 6 tpy)



## Page 6

## Attachment 4 Analysis to Determine Percent of Storage Vessels Subject to State Regulation CONDENSATE STORAGE VESSELS

2009 Total Lower 48 Condensate Wells Completions (thousands)* 17.69

``
2009 2009

Percent of total number of wells** State Rate Class (BOE/day) Avg Throughput per Rate Category (bbl/day) VOC Emissions

per Tank (tpy) Distribution of

new wells** Number of

New Wells per State Number of

Tanks subject
to NSPS Number of Tanks

subject to State Regulations
0.36% AK 0 - 1 0.018 0.04 0.0% 0
1 - 2 0.08 0.17 0.0% 0
2 - 4 0.15 0.32 0.0% 0
4 - 6 0.27 0.57 0.0% 0
6 - 8 0.39 0.82 0.0% 0
8 - 10 0.50 1.04 0.0% 0
10 - 12 0.66 1.37 0.0% 0
12 - 15 0.7 1.53 0.0% 0
15 - 20 1.0 2.10 0.0% 0
20 - 25 1.6 3.32 0.0% 0
25 - 30 1.8 3.85 0.0% 0
30 - 40 2.5 5.33 0.0% 0
40 - 50 3.6 7.59 0.0% 0 0
50 - 100 5.6 11.72 0.0% 0 0
100 - 200 12 25.37 4.0% 3 3
200 - 400 24 49.79 10.0% 6 6
400 - 800 44 92.32 4.0% 3 3
800 - 1600 68 142.17 10.0% 6 6
1600 - 3200 148 310.66 6.0% 4 4
3200 - 6400 234 489.87 22.0% 14 14
6400 - 12800 891 1864.37 40.0% 25 25
> 12800 0.0 0.00 4.0% 3
1 64 61 0 0.88% CA 0 - 1 0.018 0.04 0.0% 0
1 - 2 0.08 0.17 1.6% 3
2 - 4 0.15 0.32 0.0% 0
4 - 6 0.27 0.57 1.6% 3
6 - 8 0.39 0.82 2.5% 4
8 - 10 0.50 1.04 2.5% 4
10 - 12 0.66 1.37 4.1% 6
12 - 15 0.7 1.53 1.6% 3
15 - 20 1.0 2.10 2.5% 4
20 - 25 1.6 3.32 4.1% 6
25 - 30 1.8 3.85 4.9% 8
30 - 40 2.5 5.33 7.4% 11
40 - 50 3.6 7.59 9.8% 15 15
50 - 100 5.6 11.72 12.3% 19 19 15
100 - 200 12 25.37 27.9% 43 43 34
200 - 400 24 49.79 12.3% 19 19 15
400 - 800 44 92.32 2.5% 4 4 3
800 - 1600 68 142.17 2.5% 4 4 3
1600 - 3200 148 310.66 0.0% 0 0 0
3200 - 6400 234 489.87 0.0% 0 0 0
6400 - 12800 891 1864.37 0.0% 0 0 0
> 12800 0.0 0.00 0.0% 0
1 155 104 70 NO STATE REGULATIONS



## Page 7

## Attachment 4 Analysis to Determine Percent of Storage Vessels Subject to State Regulation CONDENSATE STORAGE VESSELS

2009 Total Lower 48 Condensate Wells Completions (thousands)* 17.69

``
2009 2009

Percent of total number of wells** State Rate Class (BOE/day) Avg Throughput per Rate Category (bbl/day) VOC Emissions

per Tank (tpy) Distribution of

new wells** Number of

New Wells per State Number of

Tanks subject
to NSPS Number of Tanks

subject to State Regulations
12.72% CO 0 - 1 0.018 0.04 0.0% 0
1 - 2 0.08 0.17 1.4% 32
2 - 4 0.15 0.32 0.5% 10
4 - 6 0.27 0.57 2.4% 54
6 - 8 0.39 0.82 6.4% 144
8 - 10 0.50 1.04 4.6% 104
10 - 12 0.66 1.37 3.1% 70
12 - 15 0.7 1.53 2.3% 52
15 - 20 1.0 2.10 3.7% 84
20 - 25 1.6 3.32 3.7% 84
25 - 30 1.8 3.85 4.7% 106
30 - 40 2.5 5.33 4.3% 97
40 - 50 3.6 7.59 6.1% 138 138
50 - 100 5.6 11.72 4.4% 99 99
100 - 200 12 25.37 17.5% 395 395 395
200 - 400 24 49.79 31.4% 706 706 706
400 - 800 44 92.32 3.2% 73 73 73
800 - 1600 68 142.17 0.2% 4 4 4
1600 - 3200 148 310.66 0.0% 0 0 0
3200 - 6400 234 489.87 0.0% 0 0 0
6400 - 12800 891 1864.37 0.0% 0 0 0
> 12800 0.0 0.00 0.0% 0
1 2,251 1,414 1177 3.54% KS 0 - 1 0.018 0.04 0.0% 0
1 - 2 0.08 0.17 5.1% 32
2 - 4 0.15 0.32 11.6% 73
4 - 6 0.27 0.57 17.5% 110
6 - 8 0.39 0.82 16.7% 104
8 - 10 0.50 1.04 10.2% 64
10 - 12 0.66 1.37 6.9% 43
12 - 15 0.7 1.53 5.5% 34
15 - 20 1.0 2.10 5.7% 36
20 - 25 1.6 3.32 5.1% 32
25 - 30 1.8 3.85 3.0% 19
30 - 40 2.5 5.33 2.2% 14
40 - 50 3.6 7.59 3.5% 22 22
50 - 100 5.6 11.72 1.4% 9 9 7
100 - 200 12 25.37 3.3% 20 20 16
200 - 400 24 49.79 1.2% 8 8 6
400 - 800 44 92.32 0.8% 5 5 4
800 - 1600 68 142.17 0.4% 3 3 2
1600 - 3200 148 310.66 0.0% 0 0 0
3200 - 6400 234 489.87 0.0% 0 0 0
6400 - 12800 891 1864.37 0.0% 0 0 0
> 12800 0.0 0.00 0.0% 0
1 627 66 35

Page 8

## Attachment 4 Analysis to Determine Percent of Storage Vessels Subject to State Regulation CONDENSATE STORAGE VESSELS

2009 Total Lower 48 Condensate Wells Completions (thousands)* 17.69

``
2009 2009

Percent of total number of wells** State Rate Class (BOE/day) Avg Throughput per Rate Category (bbl/day) VOC Emissions

per Tank (tpy) Distribution of

new wells** Number of

New Wells per State Number of

Tanks subject
to NSPS Number of Tanks

subject to State Regulations
4.49% LA 0 - 1 0.018 0.04 0.2% 1
1 - 2 0.08 0.17 0.8% 6
2 - 4 0.15 0.32 0.8% 6
4 - 6 0.27 0.57 0.8% 6
6 - 8 0.39 0.82 0.2% 1
8 - 10 0.50 1.04 0.6% 5
10 - 12 0.66 1.37 0.0% 0
12 - 15 0.7 1.53 1.3% 10
15 - 20 1.0 2.10 1.1% 9
20 - 25 1.6 3.32 1.1% 9
25 - 30 1.8 3.85 0.6% 5
30 - 40 2.5 5.33 2.6% 20
40 - 50 3.6 7.59 0.6% 5 5
50 - 100 5.6 11.72 9.0% 71 71 56
100 - 200 12 25.37 16.5% 131 131 102
200 - 400 24 49.79 10.4% 83 83 65
400 - 800 44 92.32 24.0% 191 191 149
800 - 1600 68 142.17 26.3% 209 209 163
1600 - 3200 148 310.66 3.0% 24 24 19
3200 - 6400 234 489.87 0.0% 0 0 0
6400 - 12800 891 1864.37 0.0% 0 0 0
> 12800 0.0 0.00 0.0% 0
1 795 715 554 1.70% MT 0 - 1 0.018 0.04 1.7% 5
1 - 2 0.08 0.17 2.1% 6
2 - 4 0.15 0.32 10.6% 32
4 - 6 0.27 0.57 11.9% 36
6 - 8 0.39 0.82 15.3% 46
8 - 10 0.50 1.04 12.7% 38
10 - 12 0.66 1.37 5.9% 18
12 - 15 0.7 1.53 13.6% 41
15 - 20 1.0 2.10 14.8% 45
20 - 25 1.6 3.32 5.9% 18
25 - 30 1.8 3.85 0.8% 3
30 - 40 2.5 5.33 0.8% 3
40 - 50 3.6 7.59 2.1% 6 6
50 - 100 5.6 11.72 1.3% 4 4
100 - 200 12 25.37 0.4% 1 1 1
200 - 400 24 49.79 0.0% 0 0 0
400 - 800 44 92.32 0.0% 0 0 0
800 - 1600 68 142.17 0.0% 0 0 0
1600 - 3200 148 310.66 0.0% 0 0 0
3200 - 6400 234 489.87 0.0% 0 0 0
6400 - 12800 891 1864.37 0.0% 0 0 0
> 12800 0.0 0.00 0.0% 0
1 301 11 1

Page 9

## Attachment 4 Analysis to Determine Percent of Storage Vessels Subject to State Regulation CONDENSATE STORAGE VESSELS

2009 Total Lower 48 Condensate Wells Completions (thousands)* 17.69

``
2009 2009

Percent of total number of wells** State Rate Class (BOE/day) Avg Throughput per Rate Category (bbl/day) VOC Emissions

per Tank (tpy) Distribution of

new wells** Number of

New Wells per State Number of

Tanks subject
to NSPS Number of Tanks

subject to State Regulations
0.02% ND 0 - 1 0.018 0.04 33.3% 1
1 - 2 0.08 0.17 0.0% 0
2 - 4 0.15 0.32 0.0% 0
4 - 6 0.27 0.57 0.0% 0
6 - 8 0.39 0.82 0.0% 0
8 - 10 0.50 1.04 0.0% 0
10 - 12 0.66 1.37 33.3% 1
12 - 15 0.7 1.53 0.0% 0
15 - 20 1.0 2.10 33.3% 1
20 - 25 1.6 3.32 0.0% 0
25 - 30 1.8 3.85 0.0% 0
30 - 40 2.5 5.33 0.0% 0
40 - 50 3.6 7.59 0.0% 0 0
50 - 100 5.6 11.72 0.0% 0 0 0
100 - 200 12 25.37 0.0% 0 0 0
200 - 400 24 49.79 0.0% 0 0 0
400 - 800 44 92.32 0.0% 0 0 0
800 - 1600 68 142.17 0.0% 0 0 0
1600 - 3200 148 310.66 0.0% 0 0 0
3200 - 6400 234 489.87 0.0% 0 0 0
6400 - 12800 891 1864.37 0.0% 0 0 0
> 12800 0.0 0.00 0.0% 0
1 4 0 0 6.73% NM 0 - 1 0.018 0.04 2.8% 33
1 - 2 0.08 0.17 1.4% 17
2 - 4 0.15 0.32 3.7% 45
4 - 6 0.27 0.57 3.3% 39
6 - 8 0.39 0.82 3.6% 43
8 - 10 0.50 1.04 3.0% 36
10 - 12 0.66 1.37 2.7% 32
12 - 15 0.7 1.53 4.4% 52
15 - 20 1.0 2.10 9.5% 113
20 - 25 1.6 3.32 7.0% 83
25 - 30 1.8 3.85 8.2% 98
30 - 40 2.5 5.33 14.2% 169
40 - 50 3.6 7.59 9.9% 118 118
50 - 100 5.6 11.72 17.8% 211 211
100 - 200 12 25.37 4.2% 50 50
200 - 400 24 49.79 3.2% 38 38
400 - 800 44 92.32 1.1% 13 13
800 - 1600 68 142.17 0.0% 0 0
1600 - 3200 148 310.66 0.0% 0 0
3200 - 6400 234 489.87 0.0% 0 0
6400 - 12800 891 1864.37 0.0% 0 0
> 12800 0.0 0.00 0.0% 0
1 1,191 431 0 NO STATE REGULATIONS



## Page 10

## Attachment 4 Analysis to Determine Percent of Storage Vessels Subject to State Regulation CONDENSATE STORAGE VESSELS

2009 Total Lower 48 Condensate Wells Completions (thousands)* 17.69

``
2009 2009

Percent of total number of wells** State Rate Class (BOE/day) Avg Throughput per Rate Category (bbl/day) VOC Emissions

per Tank (tpy) Distribution of

new wells** Number of

New Wells per State Number of

Tanks subject
to NSPS Number of Tanks

subject to State Regulations
5.70% OK 0 - 1 0.018 0.04 1.4% 14
1 - 2 0.08 0.17 1.0% 10
2 - 4 0.15 0.32 3.3% 33
4 - 6 0.27 0.57 2.8% 28
6 - 8 0.39 0.82 3.8% 38
8 - 10 0.50 1.04 2.3% 23
10 - 12 0.66 1.37 2.4% 24
12 - 15 0.7 1.53 2.5% 25
15 - 20 1.0 2.10 4.2% 42
20 - 25 1.6 3.32 4.4% 45
25 - 30 1.8 3.85 3.3% 33
30 - 40 2.5 5.33 4.6% 46
40 - 50 3.6 7.59 4.8% 48 48
50 - 100 5.6 11.72 14.2% 143 143 111
100 - 200 12 25.37 18.6% 187 187 146
200 - 400 24 49.79 16.7% 168 168 131
400 - 800 44 92.32 8.2% 83 83 65
800 - 1600 68 142.17 1.1% 11 11 9
1600 - 3200 148 310.66 0.5% 5 5 4
3200 - 6400 234 489.87 0.0% 0 0 0
6400 - 12800 891 1864.37 0.0% 0 0 0
> 12800 0.0 0.00 0.0% 0
1 1,008 646 467 33.20% TX 0 - 1 0.018 0.04 1.1% 62
1 - 2 0.08 0.17 1.1% 65
2 - 4 0.15 0.32 1.7% 101
4 - 6 0.27 0.57 1.6% 94
6 - 8 0.39 0.82 1.5% 85
8 - 10 0.50 1.04 1.5% 89
10 - 12 0.66 1.37 1.1% 64
12 - 15 0.7 1.53 1.5% 89
15 - 20 1.0 2.10 2.7% 157
20 - 25 1.6 3.32 3.1% 180
25 - 30 1.8 3.85 2.0% 118
30 - 40 2.5 5.33 4.1% 243
40 - 50 3.6 7.59 3.6% 214 214
50 - 100 5.6 11.72 17.0% 996 996
100 - 200 12 25.37 27.2% 1,595 1,595 1595
200 - 400 24 49.79 19.8% 1,162 1,162 1162
400 - 800 44 92.32 7.5% 443 443 443
800 - 1600 68 142.17 1.5% 87 87 87
1600 - 3200 148 310.66 0.3% 20 20 20
3200 - 6400 234 489.87 0.1% 8 8 8
6400 - 12800 891 1864.37 0.0% 1 1 1
> 12800 0.0 0.00 0.0% 0
1 5,874 4,526 3316

Page 11

## Attachment 4 Analysis to Determine Percent of Storage Vessels Subject to State Regulation CONDENSATE STORAGE VESSELS

2009 Total Lower 48 Condensate Wells Completions (thousands)* 17.69

``
2009 2009

Percent of total number of wells** State Rate Class (BOE/day) Avg Throughput per Rate Category (bbl/day) VOC Emissions

per Tank (tpy) Distribution of

new wells** Number of

New Wells per State Number of

Tanks subject
to NSPS Number of Tanks

subject to State Regulations
11.51% WY 0 - 1 0.018 0.04 17.1% 348
1 - 2 0.08 0.17 3.8% 78
2 - 4 0.15 0.32 3.3% 68
4 - 6 0.27 0.57 3.0% 61
6 - 8 0.39 0.82 2.2% 45
8 - 10 0.50 1.04 1.5% 31
10 - 12 0.66 1.37 2.1% 42
12 - 15 0.7 1.53 1.7% 34
15 - 20 1.0 2.10 2.8% 57
20 - 25 1.6 3.32 2.8% 56
25 - 30 1.8 3.85 2.1% 43
30 - 40 2.5 5.33 4.4% 89
40 - 50 3.6 7.59 4.1% 84 84
50 - 100 5.6 11.72 11.2% 228 228 228
100 - 200 12 25.37 10.9% 223 223 223
200 - 400 24 49.79 16.8% 341 341 341
400 - 800 44 92.32 9.8% 199 199 199
800 - 1600 68 142.17 0.4% 9 9 9
1600 - 3200 148 310.66 0.0% 0 0 0
3200 - 6400 234 489.87 0.1% 1 1 1
6400 - 12800 891 1864.37 0.0% 0 0 0
> 12800 0.0 0.00 0.0% 0
1 2,037 1,085 1001

14,307 ** See Attachments 2 and 3 for distribution and percent of wells within each State

7,038 5,496

Percent of regulated States 78%

9061 6621

Percent of regulated States 73%

Sum of the number of tanks with non-emission related cutoffs 1,531 1,125 Sum of the number of tanks with emissions greater than the NSPS Cutoff and in states with TPY-type cutoffs

Percent of all tanks that are subject to State Regulations (above 6 tpy)

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## ATTACHMENT 5

Sample Calculation for 2011

## ATTACHMENT 5 Sample Calculation (Oil Wells)

Number of New Development Oil Wells Completed in 2011 = 18,023 (see Table 1)

Production Rate Bracket (BOE/day) Distribution

of new wells from Table 2 Number of New

Completed Oil Wells in 2011 (a) Number of New

Affected Storage Vessels in 2011 (b) Average

Production Rate from Table 4 (bbl/day) Average Oil Storage

Vessel VOC Emissions (tpy) (c) Number of Oil

Storage Vessels with
Emissions Greater than Number of Oil

Storage Vessels Subject to State Regulation (d) Number of New

Oil Tanks Subject to NSPS (e)
0 - 1 0.64% 116 42 0.385 0.083 0 0 0
1 - 2 0.96% 174 62 1.34 0.287 0 0 0
2 - 4 2.33% 421 151 2.66 0.570 0 0 0
4 - 6 2.35% 425 153 4.45 0.953 0 0 0
6 - 8 3.00% 541 194 6.22 1.33 0 0 0
8 - 10 2.89% 521 187 8.08 1.73 0 0 0
10 - 12 2.93% 529 190 9.83 2.11 0 0 0
12 - 15 4.60% 830 298 12.1 2.59 0 0 0
15 - 20 7.98% 1,439 516 15.4 3.31 0 0 0
20 - 25 8.01% 1,443 518 19.9 4.27 0 0 0
25 - 30 7.66% 1,382 496 24.3 5.22 0 0 0
30 - 40 11.7% 2,107 756 30.5 6.54 756 0 756
40 - 50 7.28% 1,312 471 39.2 8.41 471 0 471
50 - 100 15.7% 2,828 1,015 61.6 13.2 1,015 228 787
100 - 200 11.9% 2,153 773 120 25.6 773 173 600
200 - 400 6.96% 1,254 450 238 51.0 450 101 349
400 - 800 2.40% 433 155 456 97.7 155 35 120
800 - 1600 0.45% 82 29 914 196 29 7 22
1600 - 3200 0.13% 24 9 1,692 363 9 2 7
3200 - 6400 0.086% 16 6 3,353 719 6 2 4
6400 - 12800 0.021% 4 1 6,825 1,464 1 1 0 > 12800* 0% 0 0 0 0 0 0 0 Total 100% 18,034 6,472 3,665 549 3,116

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## ATTACHMENT 5 Sample Calculation (Oil Wells)
Sample Calculation for Production Rate Bracket 200 - 400 BOE/day (2011): (a) Number of New Completed Oil Wells in 2011 = 7.0% (percent of new wells within rate bracket) x 18,023 new development oil wells completed in
2011 1,254 wells within Production Rate Bracket: 30 - 40 BOE/day (b) Calculated using assumption of number of storage vessels per well = 1 Number of storage vessels installed in 2011 from August 23, 2011 (date upon which storage vessels become affected facilities under the NSPS) until December 31, 2011. Number of Days in 2011 new affected storage vessels could be installed = 131 36% percent of the year

Number of affected storage vessels installed in 2011 = 1,254 storage vessels installed in all of 2011 x 36%
450 (c) Calculated using VOC Emission Factor for Crude oil = 0.214 tpy/bbl/day Sample Calculation for Production Rate Bracket 200 - 400 BOE/day: Average Oil Storage Vessel VOC Emissions = 0.214 tpb/bbl/day x 237.8 bbl/day
51.0 tpy (d) Percent of Oil Storage Vessels subject to State Regulations = 22% (see Table 9) Number of Storage Vessels Subject to State Regulations = 450 storage vessels that meet the NSPS applicability threshold * 22%
101 Only includes storage vessels with VOC emissions greater than the lowest State regulation applicability threshold Lowest State Regulation Applicability Threshold (Wyoming) = 10 tpy (e) Number of storage vessels subject to NSPS = [storage vessels with emissions > NSPS Applicability threshold] - [storage vessels with emissions > 10 tpy (WY statewide applicability threshold)] Number of storage vessels with VOC emissions > 6 tpy = 450 Number of storage vessels with VOC emissions > 10 tpy = - 101 Number of storage vessels subject to NSPS = 349

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