Source Test Report

of the Coker Steam Vent 

for Non-Methane and Non-Ethane 

Volatile Organic Compounds 

Prepared for: 

CITGO Refining and Chemicals Company LP 

West Plant Refinery 

P.O. Box 9176 

Corpus Christi, Texas 78469-0321 

Prepared by: 

URS Corporation 

9400 Amberglen Boulevard (78729) 

PO Box 201088 

Austin, Texas 78720-1088 

April 25, 2008
Source Test Report – Coker Steam Vent iii 40941948.04 

Table of Contents 

Page

1.0 Introduction.................................................................................................................. 1-1 

 1.1 Coker Unit Description...................................................................................... 1-5 

 1.2 Process Operations............................................................................................. 1-6 

 1.3 Source Test Timing............................................................................................ 1-6 

 1.4 Source Test Chronology .................................................................................... 1-7 

2.0 Summary of Results..................................................................................................... 2-1 

 2.1 Data Reduction Strategy .................................................................................... 2-2 

 2.2 Methane and Ethane Concentration Results ...................................................... 2-2 

 2.3 NMNE VOC Concentration Results.................................................................. 2-3 

 2.4 Vent Gas Volumetric Flow Rate Results........................................................... 2-6 

 2.5 NMNE VOC Emission Rate Results ................................................................. 2-8 

 2.6 Supplementary Data........................................................................................... 2-8 

3.0 Sampling and Analytical Procedures......................................................................... 3-1 

 3.1 Total VOC Concentration by EPA Method 25A and Other Test Method 12.... 3-2 

 3.1.1 Low-Range THC Calibration (THC2)................................................... 3-3 

 3.1.2 High-Range THC Calibration (THC1) .................................................. 3-4 

 3.1.3 Dilution Ratio and Detection Limits...................................................... 3-4 

 3.1.4 Deviations from the Source Test Protocol............................................. 3-5 

 3.2 Methane and Ethane Concentrations by EPA Method 18 ................................. 3-8 

 3.3 NMNE VOC Concentration by EPA Methods 18, 25A, and 

 Other Test Method 12 ........................................................................................ 3-9 

 3.4 Vent Gas Volumetric Flow Rate by EPA Methods 2, 3, and 4 ......................... 3-9 

4.0 Calculations ................................................................................................................ 4-1 

 4.1 Vent Dry Gas Molecular Weight ....................................................................... 4-2 

 4.2 Vent Gas Velocity Calculation .......................................................................... 4-2 

 4.3 Vent Gas Volumetric Flow Rate Calculation – Actual Conditions ................... 4-3 

 4.4 Vent Gas Volumetric Flow Rate Calculation – Dry Standard Conditions ........ 4-3 

 4.5 Standard Dry Gas Meter Sample Volume ......................................................... 4-4 

 4.6 Concentration of NMNE VOCs in the Vent Gas (Per Interval) ........................ 4-4 

 4.7 Mass Emission Rate (MER) of NMNE VOCs (Per Interval)............................ 4-5 

 4.8 Mass Emission Rate (MER) of NMNE VOCs (Per Cycle) ............................... 4-6 
Source Test Report – Coker Steam Vent iv 40941948.04 

Table of Contents 

Page

5.0 Quality Assurance Objectives for Measurement Data............................................. 5-1 

 5.1 Methane and Ethane Concentrations in the Vent Gas ....................................... 5-2 

 5.2 Total VOC Concentration in the Vent Gas........................................................ 5-3 

 5.3 NMNE VOC Concentration in the Vent Gas..................................................... 5-6 

 5.4 Volumetric Flow Rate of the Vent Gas.............................................................. 5-6 

 5.5 Project Conclusion ............................................................................................ 5-9 

 

Appendix A – Correspondence and Technical Information 

Appendix B – EPA Method 25A Raw Data and Calibration Information 

Appendix C – EPA Method 18 Raw Data and Calibration Information 

Appendix D – EPA Method 2/4 Raw Data and Calibration Information 
Source Test Report – Coker Steam Vent v 40941948.04 

List of Tables 

Page

1-1 Test Information............................................................................................................. 1-4 

1-2 Source Test Chronology ................................................................................................ 1-8 

2-1 Methane and Ethane Concentration Results – Run 1..................................................... 2-2 

2-2 Methane and Ethane Concentration Results – Run 2..................................................... 2-3 

2-3 Methane and Ethane Concentration Results – Run 3..................................................... 2-3 

2-4 NMNE VOC Concentration Results.............................................................................. 2-6 

2-5 Vent Gas Molecular Weight Results.............................................................................. 2-7 

2-6 Vent Gas Volumetric Flow Rate Results....................................................................... 2-7 

2-7 NMNE VOC Emission Rate Results ............................................................................. 2-8 

3-1 Summary of Sampling and Analytical Methods............................................................ 3-1 

3-2 THC Analyzer Calibration Summary ............................................................................ 3-6 

List of Figures 

Page

1-1 Coker Steam Vent Diagram........................................................................................... 1-6 

2-1 Total VOC Concentration Results Vs. Elapsed Time.................................................... 2-5 

2-2 Total VOC Concentration and Vent Gas Differential Pressure 

 Vs. Elapsed Time – Run 1 ............................................................................................. 2-9 

2-3 Total VOC Concentration and Vent Gas Differential Pressure 

 Vs. Elapsed Time – Run 2 ............................................................................................. 2-10 

2-4 Total VOC Concentration and Vent Gas Differential Pressure 

 Vs. Elapsed Time – Run 3 ............................................................................................. 2-11 

2-5 Total VOC Concentration and Vent Gas Differential Pressure 

 Vs. Elapsed Time – Run 4 ............................................................................................. 2-12 

3-1 Schematic Drawing of EPA Method 25A/Other Test Method 12 Sampling System.... 3-7 
Source Test Report – Coker Steam Vent 1-1 40941948.04 

1.0 Introduction 

CITGO Refining and Chemicals Company LP (CITGO) operates a Coker Unit located at 

the West Plant Refinery in Corpus Christi, Texas, under air permits 8778A and PSD-TX-408M3 

issued by the Texas Commission on Environmental Quality (TCEQ). CITGO received a Clean

Air Act (CAA) Section 114 Request for Information, dated August 4, 2006, (the “2006 Section 

114 Request”) from the Environmental Protection Agency (EPA), Office of Enforcement and 

Compliance Assurance. The 2006 Section 114 Request requested that CITGO submit a Source

Test Protocol and conduct source tests to measure (1) particulate matter (as PM-10) and Volatile 

Organic Compounds (VOCs) from the Coker Steam Vent, (2) particulate matter emissions from 

area sources and (3) volatile organic compound emissions from area sources. CITGO engaged 

URS Corporation (URS) of Austin, Texas to prepare a Source Test Protocol as requested in the 

2006 Section 114 Request and to prepare test reports detailing the results of the source testing. 

Upon EPA approval of the Source Test Protocol, URS mobilized to the site the week of 

February 5, 2007, and testing was performed on the Coker Steam Vent source from February 12 

through February 15, 2007. A Source Test Report of the Coker Unit Steam Vent, presenting the 

results of the source testing prescribed by the Source Test Protocol on the Coker Steam Vent at 

the West Plant Refinery Coker Unit, was submitted to EPA on May 9, 2007. 

CITGO received a second CAA Section 114 Request for Information letter, dated October 

9, 2007, (the “2007 Section 114 Request”) from the EPA Office of Enforcement and Compliance 

Assurance, Washington, D.C. relating to the West Plant Refinery in Corpus Christi, Texas, 

requesting further testing of the Coker Steam Vent. The 2007 Section 114 Request requested 

eight (8) specific items in an Enclosure. Item 5 reads: 

Submit a Protocol for conducting a source test to measure flow, moisture content, 

particulate matter (PM), non-methane and non-ethane volatile organic compounds, and 

benzene from the coker drum steam vents for each drum during normal representative 

operating conditions. The source test shall be conducted as follows: 

a. Test Methods 1,2,3 and 5 of 40 CFR Part 60 Appendix A and Test Method 202 of 

40 CFR Part 51 Appendix M (including a nitrogen purge) shall be used to 

determine the flow, moisture and concentration and mass emission rate of 

particulate matter; 

b. The Test Method 5 results shall separately report both front-half and back-half 

catch results with specific attention paid to collecting and analyzing condensed 

particulate matter in the sampling train; 
Source Test Report – Coker Steam Vent 1-2 40941948.04 

c. Test Method 18 shall be used to determine the concentration of all major 

components as determined by a pre-survey that shall include at least methane, 

ethane, toluene and benzene and the concentration of dissolved VOCs that may be 

collected in the impinger sampling train or condensate collection device; 

d. Test Method 25A of 40 CFR Part 60 Appendix A shall be used in combination 

with Methods 1,2,3, and 18 and the dilution methods of Other Test Method 12 

(www.epa.gov/ttn/emc/prelim.html) to determine the concentration and mass 

emission rate of non-methane/non-ethane organic compounds; 

e. Four complete venting cycles shall be tested for each pollutant with each cycle 

being reported as a separate run; 

f. Each drum shall be separately tested for each pollutant; 

g. All steam vents on a given drum shall be tested simultaneously for a given 

pollutant (e.g., for Drum A test both vents A-1 and A-2 simultaneously for nonmethane/non-ethane organic compounds and then again test both vents A-1 and 

A-2 simultaneously for particulate matter); 

h. Process parameters shall be recorded as frequently as is feasible but in no event 

less than every 15 minutes for each run and shall include the process parameters 

described in [Item 1 of the letter referenced above]; and 

i. All changes to methodology from the above prescribed methods and requirements 

shall be specifically reported in a separate section of the protocol and specifically 

approved in advance. All changes to methodology not planned and approved 

shall be specifically identified in a separate section of the test report. 

As part of the test protocol, provide operating conditions under which measurements 

shall be made and for which emission measurements shall be representative of normal 

operation of the coker. Define the ranges of the values of each operating parameter 

listed in [Item 1 of the letter referenced above] that are representative of normal 

operation. List all operating parameters that will be monitored and recorded during the 

test and describe how each parameter will be monitored and recorded. The source test 

protocol should be organized in accordance with Attachment I.

 CITGO engaged URS Corporation (URS) of Austin, Texas to prepare a Source Test 

Protocol of the Coker Unit Steam Vent in a manner consistent with Attachment I of the 2007

Section 114 Request. This protocol was submitted to EPA on November 30, 2007, and discussed 

several necessary deviations from the specifications in the 2007 Section 114 Request to 

accomplish this very complex measurement program. EPA gave conditional approval of this 

Source Test Protocol for the Coker Unit Steam Vent in a letter dated January 18, 2008. In a 

second letter to CITGO dated February 29, 2008, EPA amended the 2007 Section 114 Request to 
Source Test Report – Coker Steam Vent 1-3 40941948.04 

request that CITGO test the Coker Steam Vent A-1 for methane and ethane emission rates prior 

to a turnaround at the Coker facility that began in March 2008. 

 The supplementary testing for methane and ethane emissions was requested by EPA in 

addition to the entire scope of testing described in the Source Test Protocol for the Coker Unit 

Steam Vent, which is scheduled to commence after the completion of the turnaround at the Coker 

facility. The amended 2007 Section 114 Request also requested three (3) specific items in an 

Enclosure: 

 

1. Please submit all of the data collected from source sampling and analysis of 

samples (including Method 18 GC analysis) during the sampling of the coker vent 

emissions that occurred from about February 20, 2008 through March 1, 2008.

Categorize the data by testing method and ensure that the data is properly 

labeled.

2. Submit the process data that was required to be recorded by the October 9, 2007 

information request letter. 

3. Provide the hourly average coker feed rates for each hour of each day from 

February 19, 2008 through March 1, 2008, inclusive. 

 The precise and accurate quantification of methane and ethane concentrations in the 

Coker Steam Vent gas stream is related to the measurement of VOC emissions because methane 

and ethane have been determined by EPA to have negligible atmospheric photochemical 

reactivity. As such, the concentrations of methane and ethane can be subtracted from the 

measurement of total VOCs, quantified through the use of a total hydrocarbon analyzer, prior to 

the development of VOC mass emission rates. VOC results determined in this manner are 

referred to as non-methane/non-ethane VOC emissions (NMNE VOC). 

The source testing of the Coker Steam Vent gas stream for all of the parameters requested 

by EPA is a challenging project that requires much more than the simple performance of 

standard source testing methodologies for pollutants in a matrix of air. The accurate and precise 

measurement of the mass emission rates of NMNE VOCs from the Coker Steam Vent cannot be 

performed without significantly modifying the existing prescribed source testing methods or 

developing entirely new test methods that are consistent with the steam vent gas stream 

characteristics. The reference test methods requested by EPA to be used as the basis for the 

quantification of these selected pollutants were primarily developed for use on combustion 

source gases exiting a stack or vent. The extremely high moisture content (90-100%) and the 

high velocity (over 300 ft/sec, or 200 mph) of the vent gas stream, the amount of target analyte 

present in the vent gas stream, the dynamic nature of the vent stream characteristics, and the 

batch nature of the coking process make the implementation of the EPA reference test methods, 
Source Test Report – Coker Steam Vent 1-4 40941948.04 

as written, impossible. For example, the sampling system described in EPA Method 2 will be 

unable to condense the amount of moisture present in the vent gas stream and the electronic gas 

analyzers described in EPA Method 25A will have to be calibrated with procedures that do not 

exist in any EPA Method. Furthermore, the high degree of error associated with the 

quantification of a trace fraction (<5%) of dry gas in the steam vent gas stream will have a 

significant impact on the uncertainty associated with data reduction for pollutants on a dry gas 

basis. 

 URS mobilized to the site on February 22, 2008, and testing was performed on the Coker 

Steam Vent source from February 24 through February 28, 2008. URS followed the 

significantly modified test methods described in the Source Test Protocol for the Coker Unit 

Steam Vent to test for total VOC concentrations, methane and ethane concentrations, and vent 

gas volumetric flow rate. This Source Test Report of the Coker Steam Vent for Non-Methane 

and Non-Ethane Volatile Organic Compounds presents the results of the source testing requested 

by EPA in their letter to CITGO dated February 29, 2008. URS has organized this report in a 

manner consistent with Attachment II of the 2007 Section 114 Request except for one 

modification. All raw sampling and analytical data has been included in various appendices of 

the report and Section 4 has been limited to example calculations. General information 

regarding the testing at the Coker Steam Vent is summarized in Table 1-1. 

Table 1-1. Test Information 

Facility Name CITGO Refining and Chemicals Company LP, 

West Plant Refinery 

Contact Person(s) Mark Cheesman 

Telephone Number 361-844-4882 

Facility Address P.O. Box 9176 

Corpus Christi, Texas 78469-0321

Types of Process Sampled Coker Steam Vent A-1 Gas Stream 

Person Responsible for Conducting Test George Lipinski 

Telephone Number 512-454-4797 

Testing Company Name URS Corporation 

Address 9400 Amberglen Boulevard 

Austin, Texas 78729 

Person(s) Conducting Tests Kevin McGinn 

Walter Lin 

Carl Galloway 

Meggen DeLollis 

Test Methods Performed Modified EPA Method 2/4 

EPA Method 18 

Modified EPA Method 25A 

Modified Other Test Method 12 

Date of Testing February 24-28, 2008 
Source Test Report – Coker Steam Vent 1-5 40941948.04 

1.1 Coker Unit Description 

The Coker Unit converts, via thermal cracking, residual oil from the vacuum or crude 

unit into gas oil that can be made into light products, weak fuel gases and petroleum (pet) coke. 

The volatile constituents of the cracked product are driven off by baking at high temperatures in 

a coke drum so that the fixed carbon and residual ash are fused together. The Coker Unit has 

two coke drums which are designated in this document as Coke Drum A and Coke Drum B. 

After a coke drum is full of solidified coke, its contents are steamed to further reduce any 

remaining volatile hydrocarbon content of the coke, and the coke drum contents are waterquenched to lower the temperature. The top and bottom heads of the full coke drum are then 

removed, and the solid pet coke is subsequently ‘cut’ from the coke drum with a high pressure 

water nozzle, where it falls into a catch basin. Prior to this removal process, the Coker Steam 

Vent on top of a given coke drum activates to safely depressurize the coke drum before the cokecutting process. The Coker Steam Vent is composed of two separate vent pipes which run 

horizontally to a point outside of the coke drum structure; the upper one (A-1) being 12” in 

nominal diameter and the lower one (A-2) being 8” in nominal diameter. At the time of testing, 

these vent pipes originated from separate points on top of the coke drum. Both vent pipes remain 

open during the coke-cutting process. The entire coking process operates in a continuous cycle 

where Coke Drum A is quenched and cut while Coke Drum B is filled, and vice versa. 

The two carbon steel pipes that comprise a Coker Steam Vent activate simultaneously 

and vent steam from a given drum for approximately 45 minutes prior to and during the entire 

cutting process on the drum. The sampling was performed only on Coker Steam Vent A-1, as 

directed by EPA, by inserting “shepherd’s hook” sampling probes approximately 6 inches into 

the downstream outlet of the vent. The sampling point is marked by an ‘X’ in Figure 1-2. The 

EPA Method 2/4 and EPA Method 18/25A sampling point was approximately 258 inches from 

the nearest upstream disturbance. 

The use of the shepherd’s hook probe apparatus introduced several difficulties to the test 

effort and affected the overall quality of the data collected. The high velocity of the steam vent 

gas stream quickly degraded the protective insulation and heating components of the probe, 

lowering critical sampling system temperatures. As a result, appropriate sample gas filtering 

components of the EPA Method 2/4 sampling train could not be utilized due to the concern that 

the sampling system would become clogged prior to the collection of a sufficient amount of gas 

volume. Details regarding the difficulties and limitations associated with the shepherd’s hook 

probe apparatus are provided in the September 19, 2007 letter from Mr. Edward Lewis of 

Fulbright & Jaworski L.L.P. to Ms. Tahani Rivers of the Environmental Protection Agency, 

included in Appendix A of this document.

y 45 m

REDACTED
Source Test Report – Coker Steam Vent 1-6 40941948.04 

Figure 1-1. Coker Steam Vent Diagram

1.2 Process Operations 

The Coker Unit operates on a continuous batch cycle comprised of the filling, quenching, 

and cutting of the two contiguous Coke Drums (A and B). The Coker Unit was operated under 

normal conditions while all Coker Steam Vent source testing was performed on Coke Drum A. 

Coker Unit Process data required by EPA to be recorded during the February 2008 testing has 

already been submitted to EPA and is not included in this test report. 

1.3 Source Test Timing 

The “complete venting cycle” of Coke Drum A occurred during the period between the 

activation of the Coker Steam Vent and the optimal depressurization of the coke drum that was 

necessary before the coke-cutting process could begin. The “optimal depressurization” is 

defined by CITGO as the coke drum pressure at which the coke drum is considered ready for the 

initiation of the coke-cutting procedure (i.e., the point at which a large flange on the top of the 

coke drum is removed immediately prior to the insertion of the cutting lance into the coke drum), 

and was contingent upon the following parameters measured directly during the source test: 

 Coker Steam Vent differential pressure; 

 Coker Steam Vent absolute pressure; 

Vent A-1

Vent A-2

Coker Drum A

t differential pressure; 

t absolute pressure; 

REDACTED
Source Test Report – Coker Steam Vent 1-7 40941948.04 

 Coker Steam Vent temperature; and 

 Coke Drum pressure. 

This condition (i.e., end point) was determined on a run-by-run basis to ensure that the 

data collected would most accurately reflect actual operating conditions, because the duration of 

each venting cycle was dependent upon the batch process operation of the Coker Unit. 

For the purposes of this emissions testing, the sampling approach was directed at 

collecting samples during the first 30-minutes after Coker Steam Vent activation, although data 

was collected over a longer period of time for most runs. The project-specific health and safety 

plan (HASP) dictates that sampling personnel end sampling activities and begin moving off of 

the Coker Unit prior to the removal of the top head from the Coke drum. All of the venting 

cycles sampled during the February 2008 test effort continued beyond 45 minutes, and efforts 

were made to continue sample collection over the extended time period for as long as sampling 

equipment remained operable within acceptable performance ranges and until health and safety 

limitations were encountered. 

1.4 Source Test Chronology 

 The Source Test of the Coker Steam Vent A-1 was conducted from February 24 to 

February 28, 2008. Four venting cycles, designated as Runs 1-4, were tested for total VOC 

concentration and vent gas volumetric flow rate. Three venting cycles were tested for methane 

and ethane concentrations. Table 1-2 provides a summary of the dates and times for the 

performance of each test run on the Coker Steam Vent A-1 gas stream. The test run durations 

achieved with the EPA Method 4 sampling system (for the determination of % moisture) were 

significantly shorter than those achieved with the EPA Method 18/25A dilution sampling system 

due to the problematic clogging of the shepherd’s hook sampling probe apparatus used as a 

component of the EPA Method 2/4 sampling system. However, differential pressure and vent 

gas temperature readings were recorded according to EPA Method 2 concurrently with the 

operation of the EPA Method 18/25A sampling system and for the same duration of the venting 

cycle.

t temperature;

t 30-

45 m

REDACTED
Source Test Report – Coker Steam Vent 1-8 40941948.04 

Table 1-2. Source Test Chronology 

Source Sampling 

System(s) 

Run 

Number Date StartTime

End 

Time

Duration 

(min)

1 2/24/2008 5:05 5:24 19 

2 2/26/2008 5:05 5:27 22 

3 2/27/2008 19:36 20:08 32 

EPA 

Method 4 

4 2/28/2008 17:57 18:05 8 

1 2/24/2008 5:04 5:53 49 

2 2/26/2008 5:05 5:51 46 

3 2/27/2008 19:36 20:22 46 

EPA 

Methods 2 

and 25A 

4 2/28/2008 17:57 18:40 43 

1 2/24/2008 5:04 5:53 49 

2 2/26/2008 5:05 5:51 46 

3 2/27/2008 19:36 20:06 30 

Coker

Steam Vent 

A-1 

EPA 

Method 18 

4 2/28/2008 ---1 ---1 ---1

1

 Sample not collected. 

5:05 24 

5:05 5:27 

17:57 18:05 

19

22

8

5:04 49

46

46

43 

49

46

19:36 20:06 30

5:51 

5:53 

18:40 

5:05 

19:36 

17:57 

5:04 

5:05 

19:36 20:08 32

5:53 

5:51 

20:22 

5:2

REDACTED
Source Test Report – Coker Steam Vent 2-1 40941948.04 

2.0 Summary of Results 

This section presents a summary of the results of the emissions testing of the Coker 

Steam Vent source for methane and ethane concentrations, NMNE VOC concentrations, 

volumetric flow rates, and NMNE VOC mass emission rates. The modified methods used for 

sampling and analysis were specified in detail in the Source Test Protocol for the Coker Unit 

Steam Vent and are discussed briefly in Section 3. Example calculations are presented in Section 

4. Quality assurance objectives for the measurement data are discussed in Section 5. 

2.1 Data Reduction Strategy 

EPA’s request for information communicated interest in developing the mass emission 

rates for the selected pollutants. Pollutant mass emission rates are typically expressed using an 

industry standard of mass per unit time, such as lbs/hr, by relating the concentration of a 

pollutant to the average volumetric flow rate of a gas stream both measured during a distinct unit 

of time. Due to the atypical nature of the Coker Steam Vent source, CITGO proposes that a 

more comprehensive emissions profile be developed to meet EPA’s request. The use of a simple 

average or time-weighted average is inappropriate for developing an emissions profile for the 

dynamic characteristics of the Coker Steam Vent source. Based upon the results from this test 

effort as well as previous Coker Steam Vent testing, parameters such as gas stream velocity, vent 

gas static pressure, PM concentration, and the concentrations of organic species have been 

observed to vary greatly during the venting cycle as the coke drum depressurizes and process 

parameters such as temperature and pressure fluctuate and steadily decrease. Typical 

combustion sources – for which the EPA Methods were originally developed – do not operate as 

dynamic batch processes. Instead, they produce effluent gas streams that are more or less static 

in their profiles.

The data reduction strategy used in this report integrated pollutant mass emission rates 

(as lb/min) throughout the “complete venting cycle.” Data gaps created by the limited operation 

of the EPA Method 2/4 and EPA Method 18/25A sampling systems during a “complete venting 

cycle,” as defined is Section 1.3, were interpolated by separating the venting cycle into three 

time intervals and developing mass emission rates for each of the areas of an “emissions curve.” 

Mass emission rates, in lb/min, were developed for each minute of the “complete venting cycle” 

and then used to calculate a total lb/cycle emission rate. 

Section 2.2 presents a summary of methane and ethane concentration results obtained via 

EPA Method 18. Section 2.3 presents a summary of NMNE VOC concentration results. Section 

2.4 presents a summary of volumetric flow rate results. Section 2.5 presents NMNE VOC mass 

emission rates in lbs/cycle. Section 2.6 presents supplementary data relevant to the testing of the 

Coker Steam Vent gas stream. 
Source Test Report – Coker Steam Vent 2-2 40941948.04 

2.2 Methane and Ethane Concentration Results 

 Methane and ethane concentrations were measured according to EPA Method 18 and the 

Source Test Protocol for the Coker Unit Steam Vent conditionally approved by EPA. Tedlar bag 

samples were collected from the same dilution sampling system used for the measurement of 

total VOC concentration and analyzed with a GC/FID. An integrated sample was collected in a 

Tedlar bag during each of three time intervals that composed a vent cycle and analyzed at least in 

triplicate.1

 Three vent cycles were tested for methane and ethane emissions; however, no 

measurements were taken during the third interval of Run 3. The sampling data from each run 

are presented in Tables 2-1 through 2-3. 

URS personnel were unable to collect any Tedlar bags through the EPA Method 18/25A 

dilution sampling system during all of Run 4. During Run 4, no excess sample flow was 

available at the outlet of the dilution sampling system for the collection of integrated Tedlar 

bags. Unique gas stream conditions, such as highly negative vent gas static pressure, may have 

existed in the Coker Steam Vent during Run 4 and prevented the dilution sampling system from 

providing enough sample gas volume for the operation of both THC analyzers as well as the 

collection of integrated Tedlar bags. In addition, the shepherd’s hook probe component used 

with the dilution sampling system may have been partially clogged with moisture and particulate 

matter (PM), restricting the sample gas flow rate through the sampling system prior to the 

dilution orifice. 

Table 2-1. Methane and Ethane Concentration Results – Run 1 

 Interval 

(min) Analysis Methane (ppmw)

Ethane

(ppmw)

A 81 0 

B 92 0 

C ---1 ---1 0-15 

Average 87 0 

A 20,240 2,852 

B 19,893 2,808 

C 20,219 2,840 

15-30 

Average 20,117 2,833 

A 1,711 223 

B 1,661 216 

C 1,667 215 

Run 1 

30-46 

Average 1,680 218 

1

 Only duplicate analyses were performed for methane and ethane concentrations during Run 1. 

0-15 

15-30

30-46

REDACTED
Source Test Report – Coker Steam Vent 2-3 40941948.04 

Table 2-2. Methane and Ethane Concentration Results – Run 2 

Interval 

(min) Analysis Methane 

(ppmw)

Ethane

(ppmw)

A 466 58 

B 471 63 

C 468 62 

0-15 

Average 468 61 

A 0 0 

B 0 0 

C 0 0 

15-30 

Average 0 0 

A 11,358 1,445 

B 11,319 1,520 

C 11,411 1,523 

Run 2 

30-49 

Average 11,363 1,496 

Table 2-3. Methane and Ethane Concentration Results – Run 3 

Interval 

(min) Analysis Methane 

(ppmw)

Ethane

(ppmw)

A 335,805 41,564 

B 324,036 40,222 

C 311,021 38,720 

D 322,933 40,813 

E 325,666 41,373 

F 326,693 41,285 

0-15 

Average 324,359 40,663 

A 149,598 18,443 

B 145,419 18,292 

C 143,382 18,021 

D 142,392 17,877 

Run 3 

15-30 

Average 145,198 18,158 

2.3 NMNE VOC Concentration Results 

Vent gas sampling for the determination of total VOC concentration was performed 

according to EPA Method 25A and the dilution system procedures outlined in Other Test 

Method 12, significantly modified according to the Source Test Protocol for the Coker Unit 

Steam Vent conditionally approved by EPA. These methods were applied to measure the 

concentration of total hydrocarbons (THC) on a wet basis, as propane (C3H8), using a flame 

0-15 

15-30

30-49

0-15

15-30

REDACTED
Source Test Report – Coker Steam Vent 2-4 40941948.04 

ionization detector (FID). The results are reported as a conservative estimate of total VOC 

concentration. The total VOC concentration, in ppmvw, was averaged over each specific 

interval during the venting cycle. Figure 2-1 presents the instantaneous total VOC concentration 

results per elapsed time of the vent cycle for all four sampling runs performed on the Coker 

Steam Vent A-1 gas stream during the February 2008 testing. 

NMNE VOC concentration results were obtained by subtracting the methane and ethane 

concentrations (in ppm, on a wet basis) from the average total VOC concentration (ppm, on a 

wet basis) during each of the three intervals that composed a venting cycle. The response factor 

(RF) per carbon in an FID is usually higher for methane and ethane than propane per carbon.

Since the FIDs in the two THC analyzers were calibrated with standards of propane in air, an 

average response factor of 1.13 for methane was determined experimentally by directly 

introducing a 440.9 ppm methane calibration standard to the high-level THC analyzer 

downstream of the dilution system before Runs 3 and 4. The methane RF was calculated 

according to Equation 25Aap-1 in Other Test Method 12. As no ethane calibration standard was 

available at the time of testing, a theoretical RF of 1 was used in all applicable calculations. This 

approach assumes a FID response for ethane proportional to the number of carbon atoms in a 

molecule. Methane/propane and ethane/propane equivalencies were developing using the 

methane and ethane concentrations measured with EPA Method 18 and the appropriate RFs, then 

subtracted from the total VOC concentration data obtained through EPA Method 25A/Other Test 

Method 12. 

 Table 2-4 presents the average NMNE VOC concentration results per venting cycle 

interval. During Run 3, the methane and ethane concentrations obtained using EPA Method 18 

exceeded the average total VOC concentrations measured with EPA Method 25A/Other Test 

Method 12 during the second time interval (minutes 15-30 of the venting cycle). URS was 

unable to collect a Tedlar bag for the determination of methane and ethane during the final 

interval (minutes 30-46 of the venting cycle) of Run 3. URS personnel were also unable to 

collect any Tedlar bags through the EPA Method 18/25A dilution sampling system during all of 

Run 4. 

 15-30 

 30-46 

REDACTED
Source Test Report – Coker Steam Vent 2-5 40941948.04 

Figure 2-1. Total VOC Concentration Results Vs. Elapsed Time

0

50,000

400,000350,000300,000250,000200,000150,000100,000

0:00:00 0:02:00 0:04:00 0:06 00 : 0:08 00 : 0:10 00 : 0:12 00 : 0:14 00 : 0 1: 6 00 : 0 1: 8 00 : 0 2: 0 00 : 0 2: 2 00 : 0 2: 4 00 : 0 26: : 00 0:28:00 0:30:00 0:32:00 0:34:00 0:36:00 0:38:00 0:40 00 : 0:42 00 : 0:44 00 : 0:46 00 : 0 4: 8 00 :

Elapsed Time (min:sec)

ppmvw as propane Run 1 Run 2 Run 3 Run 4

0:00:00 0:02:00 0:020:04:00 0:06 00 : 0:08 00 : 0:10 00 : 0:12 00 : 0:14 00 : 0 1: 6 00 : 0 1: 8 00 : 0 2: 0 00 : 0 2: 2 00 : 0 2: 4 00 : 0 26: : 00 0:28:00 0:30:00 0:32:00 0:34:00 0:36:00 0:38:00 0:40 00 : 0:42 00 : 0:44 00 : 0:46 00 : 0 4: 8 00 :

REDACTED
Source Test Report – Coker Steam Vent 2-6 40941948.04 

Table 2-4. NMNE VOC Concentration Results 

Elapsed 

Time

(min)

Interval 

(min)

Total 

VOC 

(ppmw)

Methane

(ppmw)

Methane/Propane 

Equivalence 

(ppmw)

Ethane

(ppmw)

Ethane/Propane 

Equivalence 

(ppmw)

NMNE 

VOC 

(ppmw)

0-15 15 238 87 33 0 0 205 

Run 1 15-30 15 15,188 20,117 7,577 2,833 1,889 5,722 

30-49 19 5,643 1,680 633 218 145 4,865 

0-15 15 439 468 176 61 41 222 

Run 2 15-30 15 233 0 0 0 0 233 

30-46 16 6,382 11,363 4,280 1,496 997 1,105 

0-15 15 151,650 324,359 122,169 40,663 27,109 2,372 

Run 3 15-30 15 59,824 145,198 54,688 18,158 12,106 -6,970 

30-46 16 7,406 ---1 ---1 ---1 ---1 ---1

0-15 15 14,938 ---1 ---1 ---1 ---1 ---1

15-30 15 655 ---1 ---1 ---1 ---1 --- Run 4 1

30-43 13 214 ---1 ---1 ---1 ---1 ---1

1 Sample not collected.

2.4 Vent Gas Volumetric Flow Rate Results 

Vent gas sampling for the determination of volumetric flow rate was performed 

according to EPA Methods 2, 3 and 4, modified according to the Source Test Protocol for the 

Coker Unit Steam Vent conditionally approved by EPA. The separate EPA Method 2/4 

sampling train was operated to obtain as accurately as possible (given equipment limitations and 

the nature of the vent stream) velocity and moisture measurements integrated throughout as 

much of the complete venting cycle as possible. 

Due to equipment failure possibly caused by a component of the sample gas that 

interfered with the solutions used in a Fyrite combustion analyzer, URS personnel were unable to 

take measurements of oxygen and carbon dioxide concentrations in the vent gas during the 

February 2008 testing. In order to calculate vent gas molecular weight for the purposes of this 

source test, the dry gas molecular weight fraction was determined by using the average measured 

dry gas percentages of methane, ethane, and NMNE VOCs (as propane), with a balance of air, 

for each run. The average vent gas molecular weights calculated for Runs 1-4 are presented in 

Table 2-5.

The measurements obtained with the separate EPA Method 2/4 sampling train, the vent 

gas molecular weight, the moisture content, and the cross-sectional area of the carbon steel pipe 

were used to determine the average volumetric flow rate of the gas exiting the Coker Steam Vent 

0-15 

15-30 

30-49 

0-15 

15-30 

30-46 

0-15 

15-30 

30-46 

0-15 

15-30 

30-43 

15 

15 

19 

15 

15 

16 

15 

15

16 

15 

15 

13 

REDACTED
Source Test Report – Coker Steam Vent 2-7 40941948.04 

A-1 during three specific time intervals of the venting cycle. Average volumetric flow rate data, 

on a per interval basis, is presented in Table 2-6. 

Table 2-5. Vent Gas Molecular Weight Results 

Run 1 Run 2 Run 3 Run 4 

Moisture (%) 98.26 91.48 91.41 98.66 

Average propane conc., ppmvw 3,597 520 72,960 5,269 

Average propane conc., ppmvd 207,303 6,103 849,201 392,918 

Average propane conc., %, dry 20.73 0.61 84.92 39.29 

Average methane conc., ppmvw 7,295 3,944 ---1 ---1

Average methane conc., ppmvd 420,353 46,269 ---1 ---1

Average methane conc., %, dry 42.04 4.63 ---1 ---1

Average ethane conc., ppmvw 1,017 519 ---1 ---1

Average ethane conc., ppmvd 58,611 6,089 ---1 ---1

Average ethane conc., %, dry 5.86 0.61 ---1 ---1

Balance of Air, %, dry 31.37 94.15 15.08 60.71 

Dry Gas Molecular Weight, g/g-mol 26.73 28.50 41.82 34.93 

Vent Gas Molecular Weight, 

g-g-mol 18.15 18.89 20.05 18.23 

1 Due to the incomplete methane and ethane concentration data obtained during these runs, only propane 

concentrations with a balance of air were used for the determination of dry gas molecular weights.

Table 2-6. Vent Gas Volumetric Flow Rate Results 

Interval 

(min)

Elapsed 

Time

(min)

Moisture 

(%) 

Collected 

Gas 

Volume 

(dscf) 

Average 

Vent Gas 

Differential 

Pressure 

(inches H2O)

Average 

Vent 

Gas 

Velocity 

(ft/sec) 

Average 

Vent Gas 

Flow

Rate 

(dscfm) 

0-15 15 21.75 369 238 

Run 1 15-30 15 8.33 229 148 

0-49 19 

98.26 2.147 

5.60 188 122 

0-15 15 5.19 161 511 

Run 2 15-30 15 1.00 79 246 

30-46 16 

91.48 9.295 

1.11 83 258 

0-15 15 0.81 68 214 

Run 3 15-30 15 1.64 96 305 

30-46 16 

91.41 7.859 

4.78 165 526 

0-15 15 13.19 281 140 

Run 4 15-30 15 6.64 205 102 

30-43 13 

98.66 0.993 

8.14 227 113 

0-15 15 

15-30 15 

0-49 19 

15-30 15 

0-15 15 

30-46 16

0-15 15 

15-30 15 

30-46 16

0-15 15 

15-30 15 

30-43 13

21.75 

8.33 

5.60 

5.19 

1.00 

1.11 

0.81 

1.64 

4.78 

13.19 

6.64 

8.14 

REDACTED
Source Test Report – Coker Steam Vent 2-8 40941948.04 

2.5 NMNE VOC Emission Rate Results

NMNE VOC emission rates, calculated in lb/cycle, are presented for Runs 1 and 2 in 

Table 2-7. NMNE VOC emission rates are not presented for Run 3 due to incompatible and/or 

missing total VOC, methane, and ethane concentration data. NMNE VOC emission rates are not 

presented for Run 4 because no methane or ethane concentration data was obtained using EPA 

Method 18. 

Table 2-7. NMNE VOC Emission Rate Results 

 

Elapsed 

Time

(min)

Interval 

(min)

NMNE 

VOC Conc. 

(ppmw)

Moisture 

Conc. 

(%) 

NMNE 

VOC Conc.

(ppmd) 

Vent Gas 

Flow Rate

(dscfm) 

NMNE 

VOC 

Emission

Rate 

(lb/min)

NMNE 

VOC 

Emission

Rate 

(lb/interval)

NMNE 

VOC 

Emission

Rate 

(lb/cycle)

0-15 15 205 98.26 11,825 238 0.323 4.84 

Run 1 15-30 15 5,722 98.26 329,744 148 5.58 83.7 

30-49 19 4,865 98.26 280,339 122 3.91 74.2 

163 

0-15 15 222 91.48 2,606 511 0.152 2.29 

Run 2 15-30 15 233 91.48 2,735 246 0.0770 1.15 

30-46 16 1,105 91.48 12,969 258 0.384 6.14 

9.58 

2.6 Supplementary Data

This section presents supplementary data relevant to the testing of the Coker Steam Vent 

gas stream which may be pertinent to the review of the data collected through the February 2008 

testing. Figures 2-2 through 2-5 present total VOC concentration and vent gas differential 

pressure versus elapsed time of the venting cycle for Runs 1-4. 

15-30 15

0-15 15

30-49 19

0-15 15

15-30 15

30-46 16

REDACTED
Source Test Report – Coker Steam Vent 2-9 40941948.04 

Figure 2-2. Total VOC Concentration and Vent Gas Differential Pressure Vs. Elapsed Time – Run 1 

Run 1

0

80,00060,00040,00020,000

120,000100,000

0 00:0 : 0 0 02:30 : 0:05:00 0:07:30 0:10 0: 0 0:12 3: 0 0:15 0: 0 0 17:3 : 0 0 20:00 : 0:22:30 0:25:00 0:27 3: 0 0:30 0: 0 0:32 3: 0 0 35:0 : 0 0 37:30 : 0 40:00 : 0:42:30 0:45 0: 0 0:47 3: 0

Elapsed Time (min:sec)

ppmvw as propane

302520151050

O

2 inches H Total VOC Differential Pressure

0 00:0 : 0 0 02:30 : 0:05:00 0:07:30 0:10 0: 0 0:12 3: 0 0:15 0: 0 0 17:3 : 0 0 20:00 : 0:22:30 0:25:00 0:27 3: 0 0:30 0: 0 0:32 3: 0 0 35:0 : 0 0 37:30 : 0 40:00 : 0:42:30 0:45 0: 0 0:47 3: 0

302520151050

REDACTED
Source Test Report – Coker Steam Vent 2-10 40941948.04 

Figure 2-3. Total VOC Concentration and Vent Gas Differential Pressure Vs. Elapsed Time – Run 2 

Run 2

0

80,00060,00040,00020,000

120,000100,000

0 00:00 : 0 02:20 : 0 04:40 : 0 07:00 : 0 09:20 : 0 11:40 : 0:14:00 0:16:20 0:18:40 0:21:00 0:23:20 0:25:40 0:28 0: 0 0:30 2: 0 0:32 4: 0 0:35 0: 0 0:37 2: 0 0:39 4: 0 0:42 0: 0 0:44 2: 0

Elapsed Time (min:sec)

ppmvw as propane

302520151050

O

2 inches H Total VOC Differential Pressure

302520151050

0 00:00 : 0 02:20 : 0 04:40 : 0 07:00 : 0 09:20 : 0 11:40 : 0:14:00 0:16:20 0:18:40 0:21:00 0:23:20 0:25:40 0:28 0: 0 0:30 2: 0 0:32 4: 0 0:35 0: 0 0:37 2: 0 0:39 4: 0 0:42 0: 0 0:44 2: 0

REDACTED
Source Test Report – Coker Steam Vent 2-11 40941948.04 

Figure 2-4. Total VOC Concentration and Vent Gas Differential Pressure Vs. Elapsed Time – Run 3 

Run 3

0

50,000

350,000300,000250,000200,000150,000100,000

0 00:00 : 0:02 2: 0 0:04 4: 0 0:07:00 0 09:20 : 0 11:4 : 0 0:14 0: 0 0:16:20 0 18:40 : 0 21:00 : 0:23 2: 0 0:25 4: 0 0:28:00 0 30:20 : 0 32:4 : 0 0:35 0: 0 0:37:20 0:39:40 0 42:00 : 0:44 2: 0

Elapsed Time (min:sec)

ppmvw as propane

302520151050

O

2 inches H Total VOC Differential Pressure

302520151050

0 00:00 : 0:02 2: 0 0:04 4: 0 0:07:00 0 09:20 : 0 11:4 : 0 0:14 0: 0 0:16:20 0 18:40 : 0 21:00 : 0:23 2: 0 0:25 4: 0 0:28:00 0 30:20 : 0 32:4 : 0 0:35 0: 0 0:37:20 0:39:40 0 42:00 : 0:44 2: 0

REDACTED
Source Test Report – Coker Steam Vent 2-12 40941948.04 

Figure 2-5. Total VOC Concentration and Vent Gas Differential Pressure Vs. Elapsed Time – Run 4 

Run 4

0

50,000

300,000250,000200,000150,000100,000

0:00:00

0:02:30

0:05:00

0:07:30

0:10:00

0:12:30

0:15:00

0:17:30

0:20:00

0:22:30

0:25:00

0:27:30

0:30:00

0:32:30

0:35:00

0:37:30

0:40:00

0:42:30

Elapsed Time (min:sec)

ppmvw as propane

302520151050

O

2 inches H Total VOC Differential Pressure

302520151050

0 :00:00

30: 02:0

00 5:0:0

30 7:0:0

0 :10:00

30: 12:0

00:5 :10

0 :17:30

00: 20:0

30: 22:0

00:5 :20

0 :27:30

00: 30:0

30 2:3:0

00 5:3:0

30 7:3:0

00:0 :40

30 :42:0

REDACTED
Source Test Report – Coker Steam Vent 3-1 40941948.04 

3.0 Sampling and Analytical Procedures 

The modified sampling and analytical procedures that were described in the Source Test 

Protocol for the Coker Unit Steam Vent and conditionally approved by EPA were performed 

during the February 2008 testing of the Coker Steam Vent. These modified methods are briefly 

discussed in this section. Any deviations from the EPA-approved modified test methods during 

the source testing are discussed in detail. Table 3-1 provides a summary of the sampling and 

analytical methods used in the measurement of methane and ethane concentrations, total VOC 

concentrations, and vent gas volumetric flow rate from the Coker Steam Vent. 

Table 3-1. Summary of Sampling and Analytical Methods 

Parameter Sampling Methodology Analytical 

Methodology 

Volumetric 

Flow rate 

EPA Methods 

2, 3 and 4 N/A

Methane and 

Ethane EPA Method 18 

Gas Chromatography 

with Flame Ionization 

Detector

Total VOC EPA Method 25A Flame Ionization 

Detector

During certain stages of the batch operation of the Coker Unit, a vent gas stream, 

consisting mostly of steam, is released to the atmosphere through two carbon steel pipes on each 

Coke Drum. Pursuant to EPA’s request for information dated February 29, 2008, emissions 

testing using the shepherd’s hook probe apparatus was performed on Coker Steam Vent A-1, the 

12” pipe, prior to a scheduled maintenance turnaround. 

Total VOC concentration in the Coker Steam Vent gas stream was measured on a 

continuous basis using two total hydrocarbon (THC) analyzers equipped with FIDs according to 

EPA Method 25A and a dilution sampling system operated according to procedures specified in 

Other Test Method 12. Methane and ethane concentrations were measured using a gas 

chromatograph with FID according to EPA Method 18. The concentration of NMNE VOCs was 

calculated by subtracting the concentrations of methane and ethane from the average 

concentration of total VOCs during each of the three separate intervals of the venting cycle. 

The methods used for the determination of NMNE VOC concentration do not require 

isokinetic sampling, nor are the determinations of vent gas velocity and vent gas volumetric flow 

rate a part of the methods. Rather, the sample gas was removed from the vent stream nonisokinetically. The mass emission rate of measured NMNE VOCs was developed using the gas 
Source Test Report – Coker Steam Vent 3-2 40941948.04 

stream volumetric flow rate measured with an EPA Method 2/4 sampling train operated on the 

Coker Steam Vent A-1 during as much of the complete venting cycle as possible. 

3.1 Total VOC Concentration by EPA Method 25A and Other Test Method 12 

The total VOC concentration in the Coker Steam Vent gas stream was measured as THC 

using two THC analyzers that were calibrated at different yet complementary ranges. A sample 

of the Coker Steam Vent A-1 gas stream was extracted from the 12” carbon steel pipe using a 

shepherd’s hook probe apparatus and immediately diluted with high-purity zero air at a known 

dilution factor (averaging 114:1). The shepherd’s hook probe apparatus was located as close to 

the centroidal area of the pipe cross-section as possible. The diluted sample passed from the 

heated dilution probe to the two J.U.M 3-300A THC analyzers via a single heated Teflon sample 

line. 

THCs in the diluted sample were measured on a wet basis by the two THC analyzers 

using FIDs. An FID operates by ionizing organic compounds in the sample stream using the 

energy of a hydrogen/helium flame. The flame oxidizes organic compounds to generate carbon 

dioxide and water, and in the process, ions are formed in an electrical field between a polarized 

jet and collector electrode. When negative ions migrate to the collector electrode, a current is 

produced proportional to the concentration of carbon atoms in the sample gas. The analog 

voltage output reading from each THC analyzer was recorded by a data acquisition system every 

ten seconds. Both analyzers were operated in accordance with EPA Method 25A for as long as 

possible during the complete venting cycle. 

 The low-range THC analyzer (0-100 ppmw, “THC2”) was calibrated according to EPA 

Method 25A and the dilution system procedures described in Other Method 12. In accordance 

with these requirements, EPA Protocol calibration gases of propane in air were first introduced 

to THC2 downstream of the dilution system. Calibration gases were then introduced at the tip of 

the dilution probe (upstream of the dilution system). The high-range THC analyzer (0-10,000 

ppmw, “THC1”) was calibrated according to EPA Method 25A and calibration gases were only 

introduced downstream of the dilution system. 

 An EPM Dilution Probe and CAE Exemplar Flow Panel were used as part of the dilution 

sampling system. A stable dilution air pressure was maintained through all calibrations as well 

as the sampling period for all test runs. A critical orifice vacuum greater than 14.7” Hg 

(manufacturer’s specification) was also maintained through all calibrations as well as the 

sampling period for all test runs. 
Source Test Report – Coker Steam Vent 3-3 40941948.04 

3.1.1 Low-Range THC Calibration (THC2) 

A calibration error test was performed on THC2 within two hours of the beginning of 

testing for Runs 2-4. THC2 was not used during Run 1 due to an equipment malfunction (see 

Section 3.1.4 for details). EPA Method 25A requires that the THC analyzer be calibrated using 

four calibration gases: 

 A zero gas, such as high purity air; 

 A low-level calibration gas, containing propane at a concentration of 25-35% of the 

span concentration (the range of the analyzer); 

 A mid-level calibration gas, containing propane at a concentration of 45-55% of the 

span concentration (the range of the analyzer); and 

 A high-level calibration gas, containing propane at a concentration of 80-90% of the 

span concentration (the range of the analyzer). 

The calibration error test was performed on THC2 upstream of the dilution probe. High-, 

mid-, and low-range pressurized calibration gases were introduced (individually) to establish 

linearity for an effective range of nominally 11,000 ppmw. An average dilution ratio for the 

dilution sampling system was determined following the calibration error test through the dilution 

system. The instrument responses for each of these gases (after dilution) met method 

requirements and were no more than ±5% of the respective calibration gas value divided by the 

average dilution ratio during Runs 2-4. Zero gas was introduced to the THC2 analyzer upstream 

of the dilution probe as high-purity dilution air. There is no analyzer response criteria for zero 

gas specified in EPA Method 25A. 

Although not required by Other Test Method 12, or specified in the Source Test Protocol 

for the Coker Unit Steam Vent, a calibration error test was performed on THC2 downstream of 

the dilution system during Runs 2-4 as a supplementary quality assurance check. During the 

calibration error test, an excess of each of the three pressurized calibration gases of propane in 

air was introduced (individually) to the sampling system just downstream of the dilution probe to 

establish linearity for an instrument operating range of 100 ppmw. The instrument responses for 

each of these gases were no more than ±5% of the respective calibration gas value for Runs 3-4, 

and no more than ±6% for Run 2. Zero gas was introduced to the THC2 analyzer as nonpressurized ambient air. There is no analyzer response criteria for zero gas specified in EPA 

Method 25A. 

Following the completion of a test run, a zero gas and mid-level was reintroduced to the 

sampling system upstream of the dilution probe to check the calibration drift over the test period 
Source Test Report – Coker Steam Vent 3-4 40941948.04 

according to the procedures specified in EPA Method 25A and Other Test Method 12. The drift 

between the pre-run analyzer responses and the post-run analyzer responses for the mid-level 

calibration gas met method requirements and was 3% of the span (instrument operating range) 

during Runs 2-4. The drift between the pre-run analyzer responses and the post-run analyzer 

responses for the zero calibration gas was also 3% of the span during Run 3. No post-run zero 

drift determination was performed during Run 2. The drift between the pre-run analyzer 

responses and the post-run analyzer responses for the zero calibration gas was 3% of the span 

during Run 4, however, this drift determination was made by comparing instrument responses 

during calibration downstream of the dilution system. See Section 5 for details. All supporting 

documentation regarding the calibration of THC2 is documented in Appendix B. 

 

3.1.2 High-Range THC Calibration (THC1) 

A calibration error test was performed on THC1 within two hours of the beginning of 

testing. During the calibration error test, an excess of each of the three pressurized calibration 

gases of propane in air was introduced (individually) to the sampling system just downstream of 

the dilution probe to establish linearity for an instrument operating range of 10,000 ppmw. The 

instrument responses for each of these gases met method requirements and were no more than 

±5% of the respective calibration gas value during Runs 1-4. Zero gas was introduced to the 

THC1 analyzer as non-pressurized ambient air. There is no analyzer response criteria for zero 

gas specified in EPA Method 25A. A system response time test was also performed on THC1 on 

February 24. 

Following the completion of Run 1, a zero gas and mid-level was reintroduced to the 

sampling system upstream of the dilution probe to check the calibration drift over the test period 

according to the procedures specified in EPA Method 25A and Other Test Method 12. The drift 

between the pre-run analyzer responses and the post-run analyzer responses for the mid-level 

calibration gas met method requirements and was 3% of the 0-100 ppmw span. A post-test 

calibration drift determination for the 0-10,000 ppmw span was not determined during Run 1. 

Post-run calibration drift determinations were made on THC1 during Runs 2-4, but not according 

to the procedures specified in EPA Method 25A or the Source Test Protocol for the Coker Unit 

Steam Vent. See Section 3.1.4 for details. All supporting documentation regarding the 

calibration of THC1 is documented in Appendix B. 

3.1.3 Dilution Ratio and Detection Limits 

A dilution ratio (DLR) for the dilution sampling system was developed using THC2 

(except during Run 1 – see Section 3.1.4 for details) and was applied as a multiplier to all of the 

measurements obtained with both THC analyzers used in conjunction with the same dilution 

sampling system per procedures described in the Source Test Protocol for the Coker Unit Steam 

Vent. 
Source Test Report – Coker Steam Vent 3-5 40941948.04 

Lower detection limits were calculated for both THC analyzers by multiplying the runspecific DLR by a conservative instrument sensitivity of 2% of the instrument operating ranges 

(0-100 ppmw and 0-10,000 ppmw, respectively). Upper detection limits were calculated for both 

THC analyzers by multiplying the run-specific DLR by the upper limits of the operating ranges 

(100 ppmw and 10,000 ppmw, respectively). The effective measurement ranges and average 

DLRs were determined on a per run basis. Any THC results not covered by the two effective 

measurement ranges were rounded up to the lower limit of the nearest measurement range as 

determined during daily calibration. Table 3-2 presents a summary of the effective THC 

analyzer calibration ranges, dilution ratios, and detection limits for each test run. 

3.1.4 Deviations from the Source Test Protocol 

Several deviations from methodology specified in the Source Test Protocol for the Coker 

Unit Steam Vent and/or Other Test Method 12 and EPA Method 25A were encountered during 

the February 2008 testing. The relative impacts of these deviations on data quality are discussed 

in Section 5. The deviations are as follows: 

 The low-range THC2 analyzer was inoperable during Run 1. To mitigate this issue, 

the high-range THC1 analyzer, operating with an instrument range of 0-10,000 

ppmw, was calibrated both upstream and downstream of the dilution system. The 

analyzer showed sufficient linearity across the entire operating range to meet EPA 

Method 25A requirements for the calibration error test at both the 0-100 ppmw and 0-

10,000 ppmw spans. The same approach for the determination of conservative 

detection limits as used in all other test runs was applied to THC1 during Run 1. 

 URS personnel were required to exit the Coker Unit at least 15 minutes prior to the 

drum de-heading and coke-cutting procedure and did not have adequate time to 

perform all of the quality assurance checks required by EPA Method 25A and Other 

Test Method 12 and described in the Source Test Protocol for the Coker Unit Steam 

Vent. As a result, post-run calibration drift determinations were made on THC1 

during Runs 2-4, but not according to the procedures specified in EPA Method 25A 

or the Source Test Protocol for the Coker Unit Steam Vent. See Section 5 for details. 

 No post-run zero drift determination was performed on THC2 during Run 2. 

 During Run 4, a zero-drift determination was performed on THC2 by comparing 

responses obtained by introducing a zero gas downstream of the dilution system 

instead of upstream of the dilution system. 

 All zero gas introduced downstream of the dilution system to both THC1 and THC2 

was ambient air rather than pressurized, high-purity zero air.
Source Test Report – Coker Steam Vent 3-6 40941948.04 

Table 3-2. THC Analyzer Calibration Summary 

 THC

Analyzer 

Instrument

Operating

Range 

(ppmw)

Type of 

Calibration 

Dilution

Ratio 

Lower

Detection 

Limit

(ppmw)

Upper 

Detection 

Limit

(ppmw)

w/dilution 237.90 11,895.01 Run 1 THC 1 0-10,0001

w/o dilution 

119.0 

23,790.02 1,189,501.19 

THC 2 0-100 w/dilution 233.07 11,653.35 Run 2 

THC 1 0-10,000 w/o dilution 

116.5 

23,306.69 1,165,334.70 

THC 2 0-100 w/dilution 222.86 11,143.16 Run 3 

THC 1 0-10,000 w/o dilution 

111.4 

22,286.33 1,114,316.31 

THC 2 0-100 w/dilution 214.31 10,715.42 Run 4 

THC 1 0-10,000 w/o dilution 

107.2 

21,430.84 1,071,542.11 

1

 Due to an equipment malfunction, only one THC analyzer was operable during Run 1. The analyzer was operated on a 

0-10,000 ppmvw range and demonstrated sufficient linearity for both 0-100 ppmvw and 0-10,000 ppmvw ranges when 

calibrated. See Section 3.1.4 for details. 

 
Source Test Report – Coker Steam Vent 3-7 40941948.04 

Figure 3-1. Schematic Drawing of 

EPA Method 25A/Other Test Method 12 Sampling System 

Dilution Air 
Source Test Report – Coker Steam Vent 3-8 40941948.04 

3.2 Methane and Ethane Concentrations by EPA Method 18 

The concentrations of methane and ethane in the Coker Steam Vent gas stream were 

measured using a gas chromatograph (GC) fitted with a FID. A diluted sample of the Coker 

Steam Vent A-1 gas stream was extracted via the EPA Method 18/25A sampling system to a 

Tedlar bag, prior to the interface of the sample gas with the two THC analyzers. An integrated 

bag sample was collected during each of three time intervals that composed a vent cycle. The 

Tedlar bag was then transported to a mobile laboratory until analysis by GC/FID. Three source 

gas samples were collected in Tedlar bags during the venting cycle for Runs 1 and 2. Two 

source gas samples were collected during the venting cycle for Run 3. URS personnel were 

unable to collect any Tedlar bags through the EPA Method 18/25A dilution sampling system 

during all of Run 4. 

Methane and ethane concentrations in the diluted sample were measured on a wet basis 

by the GC/FID. Each source gas sample collected during Runs 2 and 3 was analyzed at least in 

triplicate and the final result was calculated as the average of all separate analyses of the sample. 

During the first 15-minute interval of Run 1, a deviation from The Source Test Protocol for the 

Coker Steam Vent and EPA Method 18 occurred when source gas samples were analyzed in 

duplicate instead of in triplicate. The dilution factors developed on a run-by-run basis through 

the operation of the EPA Method 18/25A sampling system (see Section 3.1.3) were incorporated 

into the EPA Method 18 analyses. 

 Prior to the start of sampling, the GC/FID analyzer was calibrated using EPA Protocol 

calibration gas standards containing the target analytes in a balance of nitrogen. The following 

calibration and QA procedures presented in EPA Method 18 were followed: 

 The instrument was calibrated at three points before sample analysis and at one point 

after analysis; and 

 A recovery study showed 90-110% recovery of a gas sample introduced as close to the 

probe as possible. 

The recovery study was not performed exactly as described in EPA Method 18 because 

this method does not specify a procedure for performing a recovery study using both a dilution 

sampling system and bag sampling. Elements of both Section 8.4.1 and Section 8.4.2 of EPA 

Method 18 were followed to perform the recovery study during the February 2008 testing. 

However, a duplicate analyses were performed instead of triplicate analyses and methane or 

ethane were not spiked directly into the bag sample. Raw data and calibration information 

associated with the performance of EPA Method 18 is included as Appendix C. 
Source Test Report – Coker Steam Vent 3-9 40941948.04 

3.3 NMNE VOC Concentration by EPA Methods 18, 25A, 

and Other Test Method 12 

The precise and accurate quantification of methane and ethane concentrations in the 

Coker Steam Vent gas stream is related to the measurement of VOC emissions because methane 

and ethane have been determined by EPA to have negligible atmospheric photochemical 

reactivity. As such, the concentrations of methane and ethane can be subtracted from the 

measurement of total VOCs, quantified through the use of a total hydrocarbon analyzer, prior to 

the development of VOC mass emission rates. VOC results determined in this matter are 

referred to as non-methane/non-ethane VOC emissions (NMNE VOC). 

The response factor (RF) per carbon in an FID is usually higher for methane and ethane 

than propane per carbon. Since the FIDs in the two THC analyzers were calibrated with 

standards of propane in air, an average response factor of 1.13 for methane was determined 

experimentally by directly introducing a 440.9 ppm methane calibration standard to the highlevel THC analyzer downstream of the dilution system before Runs 3 and 4. The methane RF 

was calculated according to Equation 25Aap-1 in Other Test Method 12. As no ethane 

calibration standard was available at the time of testing, a theoretical RF of 1 was used in all 

applicable calculations. This approach assumes a FID response for ethane proportional to the 

number of carbon atoms in a molecule. Methane/propane and ethane/propane equivalencies 

were developing using the methane and ethane concentrations measured with EPA Method 18 

and the appropriate RFs. 

The concentration of NMNE VOCs in the Coker Steam Vent gas stream was calculated 

by subtracting the propane-equivalent concentrations of methane and ethane from the average 

concentration of total VOCs measured with the THC analyzers during each established interval 

of the venting cycle. 

3.4 Vent Gas Volumetric Flow Rate by EPA Methods 2, 3, and 4 

The Coker Steam Vent A-1 volumetric flow rate was determined according to procedures 

based upon EPA Methods 2 and 4. The EPA Method 2/4 sampling train utilized a separate 

shepherd’s hook probe apparatus than the one utilized by the EPA Method 18/25A sampling 

system. The EPA Method 2/4 shepherd’s hook probe apparatus was positioned as close to the 

centroidal area of the 12” pipe cross-section as possible. The modified procedures by which 

volumetric flow rate data was obtained on the high-moisture Coker Steam Vent gas stream have 

already been described in detail in the Source Test Protocol for the Coker Unit Steam Vent. Any 

deviations from those modified procedures are discussed in this section. 

The EPA Method 2/4 sampling train consisted of the following components: 

 
Source Test Report – Coker Steam Vent 3-10 40941948.04 

 Heated stainless steel probe liner; 

 Teflon transfer line between the probe liner and the coiled condenser; 

 Coiled condenser; 

 Up to 16 optional knockout impingers (the first knockout impinger was empty, 

the second contained a modified Greenburg-Smith stem and nominally 100 mL of 

DI Water, the third contained a Greenburg-Smith stem and nominally 100 mL of 

DI Water, and the remaining knockout impingers were empty); and 

 Modified Greenburg-Smith impinger containing silica gel. 

According to the Source Test Protocol for the Coker Unit Steam Vent, the sampling probe 

and filter were to be maintained at 300°F ±25°F to keep the steam vent gas stream in the gas 

phase until condensation in the sampling train condenser coil and impingers. However, this 

approach was designed for the use of standard sampling probes and specialized sampling ports, 

not a shepherd’s hook apparatus. URS personnel could not maintain the shepherd’s hook probe 

temperature (reflected on URS data sheets as two components: “Probe” and “Hook Probe”) at 

300°F ±25°F, or even at a stable temperature consistently above the vent gas temperature, due to 

the damage to probe insulation caused by the high-velocity gas stream (at times >300 ft/sec, or 

200 mph). Refer to Section 5 for a discussion of the impacts of variable shepherd’s hook probe 

temperature on overall data quality for this source test. 

 URS personnel did not include a filter in the EPA Method 2/4 sampling train due to 

concerns that the filter would quickly become clogged with moisture and/or particulate matter 

when maintained at temperatures below 300°F ±25°F. As a result, small amounts of particulate 

matter were visible in the condensate collected in the sampling train impingers during all four 

test runs. Refer to Section 5 for a discussion of the measurement bias caused by particulate mass 

in the impinger contents for the determination of vent gas moisture concentration. 

During the EPA Method 2 sampling, differential pressure measurements across a Type-S 

pitot tube were recorded to determine the vent gas velocity. These measurements were made 

with a magnehelic differential pressure gauge rather than a gauge-oil manometer due to the high 

vent gas differential pressure encountered in the Coker Steam Vent. It is important to note that 

the 0-30” H2O magnehelic gauge used during the February 2008 testing had 1” H2O divisions 

throughout the entire 0-30” H2O scale. A calibration check was performed on the magnehelic 

gauge according to EPA Method 2, Section 6.2.1. This calibration check data as well as other 

calibration information associated with equipment used in the EPA Method 2/4 sampling train is 

included in Appendix D. 

In anticipation of significant changes in velocity head readings during the test run, the 

differential pressure readings, vent temperature readings, dry gas meter readings, and other 

t 300°

300°

w 300°

 REDACTED
Source Test Report – Coker Steam Vent 3-11 40941948.04 

applicable sampling system operating parameters were recorded every two (2) minutes during 

the test runs and for as long as possible during the “complete venting cycle.” Accurate static 

pressure measurements for use in the determination of vent gas velocity were not successfully 

obtained with a magnehelic gauge until the latter half of Run 4, due to the clogging of the static 

pressure probe with moisture and particulate matter and other equipment malfunctions. The 

average of the accurate static pressure readings (measured from 18:27 to 18:39) obtained during 

Run 4 was applied to all vent gas velocity calculations for Run 1, 2, 3 and 4. This approach is 

discussed further in Section 5. 

Due to equipment failure, possibly caused by a component of the sample gas that 

interfered with the solutions used in a Fyrite combustion analyzer, URS personnel were unable to 

take measurements of oxygen and carbon dioxide concentrations in the vent gas during the 

February 2008 testing. In order to calculate vent gas molecular weight for the purposes of this 

source test, the dry gas molecular weight fraction was determined by using the average measured 

dry gas percentages of methane, ethane, and NMNE VOCs (as propane), with a balance of air, 

for each run. The average vent gas molecular weights calculated for Runs 1-4 are presented in 

Table 2-5. 

The dry gas sample volume was measured using a calibrated dry gas meter. The Source

Test Protocol for the Coker Unit Steam Vent specified that dry gas meters used in this test 

program would be calibrated using traceable critical orifices as standards. As an alternative, 

URS has developed an internal standard operating procedure (SOP) to calibrate a dry gas meter 

at low flow conditions (nominally 1-9 liters per minute) using a NIST-traceable volumetric 

flowmeter as a calibration standard. The dry gas meters used in the February 2008 testing were 

calibrated according to this SOP, which is based upon procedures specified in EPA Method 5 

and EPA Method 30B. All pre- and post-run dry gas meter calibration data is included in 

Appendix D and a copy of the URS SOP is included as Appendix A. The dry gas meter 

calibration factors applicable to specific average sampling rates were used in all data reduction, 

per the URS SOP; however, these calibration factors were not recorded on the URS raw 

sampling data sheets at the time of testing. 

The source sampling of a gas stream composed essentially of steam produces total dry 

gas volumes and dry gas sampling rates far below those normally achieved using EPA Method 4. 

One of the consequences of low sampling rates acquired with sampling trains composed of 

several large knockout impingers, joints, and unions is the possibility of a post-test leak check 

rate exceeding 4% of the average sampling rate achieved during the test run. In such a case, 

EPA Method 5 requires dry gas volume correction according to EPA Equation 5-1(a) Case I. 

During the February 2008 testing of the Coker Steam Vent, Run 1 required dry gas volume 

correction according to this equation. Supporting information for this dry gas volume correction 

m 18:27 to 18:39) 

 REDACTED
Source Test Report – Coker Steam Vent 3-12 40941948.04 

is provided in Appendix D. Due to URS operator error, no post-test leak check was performed 

on the EPA Method 2/4 sampling train during Run 2. The pre-run leak test was compared to the 

average sampling rate during Run 2 in lieu of a post-run leak test, but no dry gas volume 

correction was required. 

The moisture content of the gas stream was determined from the total weight gain of the 

sampling train impingers according to EPA Method 4. A significant organic layer was not 

present in the condensate catch upon visual inspection of the impingers, and a separatory funnel 

was not used to remove the organic layer prior to the gravimetric determination of condensed 

water. 

The measurements obtained with the separate EPA Method 2/4 sampling train, the vent 

gas molecular weight, the moisture content, and the cross-sectional area of the carbon steel pipe 

were used to determine the average volumetric flow rate of the gas exiting the Coker Steam Vent 

A-1 during three specific time intervals of the venting cycle. Average volumetric flow rate data, 

on a per interval basis, is presented in Table 2-6. 
Source Test Report – Coker Steam Vent 4-1 40941948.04 

4.0 Calculations 

 This section presents calculations used in the determination of total VOC, methane and 

ethane concentrations, vent gas volumetric flow rates, and NMNE VOC mass emission rates for 

the February 2008 testing of the Coker Steam Vent. The calculation of NMNE VOC mass 

emission rates in a lb/cycle format rather than a typical lb/hour format is an approach developed 

specifically for this project and the Coker Steam Vent source. The complete venting cycle 

sampled during each test run was separated into three distinct intervals for the calculation of 

NMNE VOC mass emission rates in order to most accurately characterize the dynamic batch 

process of the Coker Unit. The following parameters were averaged for each distinct interval 

during a test run: 

 Vent Gas Temperature; 

 Vent Gas Differential Pressure; 

 Vent Gas Velocity; 

 Vent Gas Volumetric Flow Rate; and 

 Total VOC Concentration. 

Methane and ethane emissions were sampled by taking an integrated Tedlar bag sample 

during each of the distinct intervals that composed the complete venting cycle. The calculation 

of NMNE VOC concentrations was performed by subtracting methane and ethane concentrations 

from the total VOC concentration during each interval. The complete venting cycle was divided 

into the following intervals for each test run, starting with the activation of the Coker Steam 

Vent, and ending with the optimal depressurization of the Coke Drum: 

 Run 1: 0-15 minutes, 15-30 minutes, and 30-49 minutes. 

 Run 2: 0-15 minutes, 15-30 minutes, and 30-46 minutes. 

 Run 3: 0-15 minutes, 15-30 minutes, and 30-46 minutes. 

 Run 4: 0-15 minutes, 15-30 minutes, and 30-43 minutes. 

 0-15 m 15-30 d 30-49 m

d 30-46 m

d 30-46 m

d 30-43 m

 0-15 m 15-30 

 0-15 m 15-30 

 0-15 m 15-30 

 REDACTED
Source Test Report – Coker Steam Vent 4-2 40941948.04 

4.1 Vent Gas Dry Molecular Weight 

 The dry gas molecular weight of the vent gas exiting the 12” pipe (A-1) was calculated 

per run according to the following equation, based upon EPA Equation 3-1: 

M 0.290 (%Air) 0.441 (%C H ) 0.301 (C H ) 0.160(CH ) d  3 8 2 6 4

Where: 

 Md = dry gas molecular weight, g/g-mol; 

 %Air = average percent air by volume, dry basis, per run; 

 %C3H8 = average percent propane by volume, dry basis, per run; 

 %C2H6 = average percent ethane by volume, dry basis, per run; 

 %CH4 = average percent methane by volume, dry basis, per run; 

 0.290 = molecular weight of air, divided by 100; 

0.441 = molecular weight of propane, divided by 100; 

0.301 = molecular weight of ethane, divided by 100; and 

0.160 = molecular weight of methane, divided by 100. 

4.2 Vent Gas Velocity Calculation 

The velocity of the vent gas exiting the 12” pipe (A-1) was calculated according to 

procedures based upon EPA Method 2 during three time intervals of the venting cycle as: 

(P )(M )

(T ) V 85.49 C

S W

S

S  P P

Where: 

 VS = velocity of the vent gas, per interval (ft/sec); 

P = average differential pressure measured, per interval, by Type S pitot (in. H2O); 

 Ts = average vent gas temperature, per interval (°R); 

 Ps = absolute vent pressure, per interval (in. Hg); 

 Mw = wet gas molecular weight, per complete cycle (lb/lb-mole); 

 Cp = Type-S pitot correction factor (0.84); and 

 85.49 = conversion constant, per Equation 2-7 of EPA Method 2. 
Source Test Report – Coker Steam Vent 4-3 40941948.04 

4.3 Vent Gas Volumetric Flow Rate Calculation - Actual Conditions

 The volumetric flow rate of the vent gas exiting the 12” pipe (A-1) was calculated 

according to procedures based upon EPA Method 2 during three time intervals of the venting 

cycle as: 

Qac  60   Vs A

Where: 

 Qac = actual volumetric flow rate, per interval (acfm); 

 Vs = velocity of the vent gas, per interval (ft/sec); 

 A = cross-sectional area of the vent (ft2); and 

 60 = conversion from second to minutes. 

4.4 Vent Gas Volumetric Flow Rate Calculation - Dry Standard Conditions

 The volumetric flow rate of the vent gas exiting the 12” pipe (A-1) at dry standard 

conditions was calculated according to procedures based upon EPA Method 2 during three time 

intervals of the venting cycle as: 





	 












	









  
 29.92

P

T

528 Q (1 B ) (Q ) S

S

sd W ac

Where: 

Qsd = dry volumetric flow rate at standard conditions, per interval (dscfm); 

Qac = actual volumetric flow rate, per interval (acfm); 

Bw = moisture fraction, per complete venting cycle; 

528 = standard temperature (°R); 

Ts = average vent gas temperature, per interval (°R); 

29.92 = standard pressure (in. Hg); and 

Ps = absolute vent pressure, per interval (in. Hg). 
Source Test Report – Coker Steam Vent 4-4 40941948.04 

4.5 Standard Dry Gas Meter Sample Volume 

 The dry gas meter volume at standard conditions will be calculated as: 











	















 



	 




 







	









  29.92

13.6

P BP

T

528 V (V )

m

m

sd ac

Where: 

Vsd = dry gas meter volume at standard conditions (dscf); 

Vac = actual dry gas meter volume (dcf); 

13.6 = conversion from in. H2O to in. Hg (in. H2O/in. Hg); 

528 = standard temperature (°R); 

Tm = average dry gas meter temperature (°R); 

29.92 = standard pressure (in. Hg); 

Pm = dry gas meter pressure (in. H2O); and 

BP = barometric pressure at the dry gas meter location (in. Hg). 

Vac was calculated according to EPA Equation 5-1(a) Case I during Run 1. 

4.6 Concentration of NMNE VOCs in the Vent Gas (Per Interval) 

 The concentration of total VOC (as propane) was continuously measured throughout the 

venting cycle in units of parts per million volume, wet basis (ppmvw). NMNE VOC 

concentration was calculated by subtracting the concentrations of methane and ethane (as 

determined by EPA Method 18) from the concentration of total VOC (as determined by EPA 

Method 25A). The average concentration of NMNE VOC was calculated during three time 

intervals of the venting cycle as: 

     

3

2 C RF

3

C RF [C] C M M E E

VOC THC

 
   


Where: 

 [C]VOC = average concentration of NMNE VOC, as propane, per interval (ppmvw); 

 [C]THC = average concentration of total VOC measured, per interval (ppmvw); 

 [C]M = concentration of methane, per interval (ppmvw); 

RFM = FID response factor for methane, determined directly (unitless); 

 [C]E = concentration of ethane, per interval (ppmvw); and 

RFE = FID response factor for ethane, determined theoretically (unitless). 
Source Test Report – Coker Steam Vent 4-5 40941948.04 

All NMNE VOC concentrations measured as propane, per interval, were corrected to a 

dry basis (ppmvd) using moisture values obtained with the EPA Method 2/4 sampling train 

operated concurrently with the EPA Method 18/25A sampling system. Conversion of NMNE 

VOC concentration results from ppmvd to grams per dry standard cubic foot will be calculated 

using this equation: 

   

  10   385

[C] 44.1 453.6 [C] 6

VOC

VOCg / dscf 

Where: 

 [C]VOCg/dscf = concentration of NMNE VOCs as propane, per interval (g/dscf); 

 [C]VOC = concentration of NMNE VOCs as propane, per interval (ppmvd expressed as 

scf/106

 scf for the purposes of this calculation); 

 44.1 = molecular weight of propane (lb/lb-mol); 

 453.6 = conversion from pounds to grams (g/lb); 

 106

 = conversion from ppmvd to scf/scf (unitless); and 

 385 = ideal gas law constant (scf/lb-mol).

4.7 Mass Emission Rate (MER) of NMNE VOCs (Per Interval) 

The mass emissions rate for NMNE VOCs, in lb/min, were calculated during three time 

intervals of the venting cycle as: 

Where: 

MERi = mass emission rate of NMNE VOC, per interval (lb/min); 

[C] = concentration of NMNE VOC, per interval (g/dscf); 

453.6 = conversion from grams to pounds (g/lb);

Qsd = dry volumetric flow rate at standard conditions (dscfm) obtained through the 

operation of the EPA Method 2/4 sampling trains, per interval; and 

60 = conversion from minutes to hours. 





	 




  453.6

Q MER 60 [C] sd

i
Source Test Report – Coker Steam Vent 4-6 40941948.04 

4.8 Mass Emission Rate (MER) of NMNE VOCs (Per Cycle) 

 The total mass emission rates for NMNE VOCs, in lb/cycle, was calculated from the 

mass emission rates of NMNE VOCs for each time interval of the venting cycle as follows: 

Where: 

 MERCycle = mass emission rate of NMNE VOC, per venting cycle (lb/cycle); 

MERi = mass emission rate of NMNE VOC, per interval (lb/min); 

Ti = total time of sampling interval (minutes); and 

cycle = 1 -- one complete venting cycle event. 

 

cycle

MERi Ti

 1 MERCycle
Source Test Report – Coker Steam Vent 5-1 40941948.04 

5.0 Quality Assurance Objectives for Measurement Data

Quality assurance/quality control (QA/QC) activities were performed as an integral part 

of this sampling and analysis measurement program to ensure that results are of known quality.

As previously discussed, the useability of the results from the February 2008 sampling effort is 

significantly limited by the nature of the stream measured (high moisture and velocity) and the 

shepherd’s hook sampling apparatus. To the extent that any of the test results are useable given 

these limitations, the review of the QA/QC activities indicates that the results are useable for the 

purposes of estimating emissions of NMNE VOC concentrations and mass emission rates only 

for Runs 1 and 2 of the February 2008 testing. The high variability of the NMNE VOC mass 

emission rate results during Runs 1 and 2 (163 and 9.58 lb/cycle, respectively) is of a magnitude 

not usually associated with the emissions testing of typical sources. The high variability of 

NMNE VOC concentrations may be associated with measurement interference due to the high 

concentration of moisture in the vent stream (> 90%) or with the batch nature of the Coking 

process itself. This testing is part of ongoing research of the potential emissions associated with 

the Coker Steam Vent source, and further testing is necessary in order to produce NMNE VOC 

mass emission rate results appropriate for use. 

The data obtained through the February 2008 testing also indicates that the Coker Steam 

Vent VOC emissions are consistently composed of significant fractions of methane and ethane 

and that any evaluation of VOC emissions from this type of source in the future must include the 

accurate and precise quantification of methane and ethane. In addition, the results obtained for 

the determination of vent gas moisture concentration, velocity, and volumetric flow rate during 

Runs 1-4 are useable for the purposes of establishing a general data set for estimated Coker 

Steam Vent emissions profiles. 

The QA objectives for this test program are designed to provide a quantitative assessment 

of the measurement system data. The two aspects of data quality that are of primary concern are 

precision and accuracy. Accuracy reflects the degree to which the measured value represents the 

actual or "true" value for a given parameter and includes elements of both bias and precision. 

Precision is a measure of the variability associated with the measurement system. This section 

presents QA objectives for each of the five sampling tasks: 

 Methane and Ethane concentrations in the vent gas; 

 Total VOC concentration in the vent gas; 

 NMNE VOC concentration in the vent gas; 

 Volumetric flow rate of the vent gas; and 

 NMNE VOC mass emission rates from the Coker Steam Vent. 
Source Test Report – Coker Steam Vent 5-2 40941948.04 

5.1 Methane and Ethane Concentration in the Vent Gas 

QA/QC activities associated with the collection of the methane and ethane emissions gas 

samples include: 

 Use of pre-printed data sheets; 

 Use of calibrated sampling equipment; 

 Use of calibration and dilution gas of appropriate and documented quality; 

 Collection of samples at appropriate operating conditions; 

 Proper operation of the dilution sampling system; 

 Performance of sampling system leak checks; and 

 Collection of samples per the protocol and the method. 

QA/QC activities associated with the analysis of emissions gas samples include: 

 Calibration of the analytical instrumentation; 

 Use of documented calibration standards; 

 Replicate analyses; and 

 Analyses of samples per the protocol and the method. 

A review of the data quality associated with these measurements indicate that these data 

are representative and usable for the purpose intended for Runs 1 and 2. Only a rough estimation 

can be made of the methane and ethane concentrations per complete venting cycle during Run 3 

due to the incomplete data set. The issues identified during the data quality review are discussed 

on a per run basis: 

Run 3 

The Source Test Protocol for the Coker Unit Steam Vent specified that a separate bag 

sample would be collected at each of the three identified intervals within a sampling run. During 

Run 3, URS personnel were unable to collect an integrated Tedlar bag sample (due to operator 

error) during the third interval of the test run (30-49 minutes after the activation of the Coker 

Steam Vent). As a result, a NMNE VOC concentration and mass emission rate could not be 

calculated for this time interval. 

The incompatible total VOC, methane, and ethane concentration results obtained during 

the second interval of Run 3 (15-30 minutes after the activation of the Coker Steam Vent) also 

contribute to reducing the overall data quality associated with this test run. Refer to Table 2-4 

for detailed concentration results. The averaging of the total VOC, methane, and ethane 

(30-49 m

(15-30 m

 REDACTED
Source Test Report – Coker Steam Vent 5-3 40941948.04 

concentrations obtained over the entire test run, instead of performing emissions calculations per 

interval, also produces a net deficit of NMNE VOC. 

Run 4 

The Source Test Protocol for the Coker Unit Steam Vent specified that a separate bag 

sample would be collected at each of the three identified intervals within a sampling run. URS 

personnel were unable to collect any Tedlar bags through the EPA Method 18/25A dilution 

sampling system during all of Run 4. During Run 4, no excess sample flow was available at the 

outlet of the dilution sampling system for the collection of integrated Tedlar bags. Unique gas 

stream conditions, such as highly negative vent gas static pressure, may have existed in the 

Coker Steam Vent during Run 4 and prevented the dilution sampling system from providing 

enough sample gas volume for the operation of both THC analyzers as well as the collection of 

integrated Tedlar bags. In addition, the shepherd’s hook probe component used with the dilution 

sampling system may have been partially clogged with moisture and particulate matter (PM), 

restricting the sample gas flow rate through the sampling system prior to the dilution orifice. 

5.2 Total VOC Concentration in the Vent Gas 

QA/QC activities associated with the collection of the total VOC emissions gas samples 

include: 

 Use of pre-printed data sheets; 

 Use of calibrated sampling equipment; 

 Use of calibration and dilution gas of appropriate and documented quality; 

 Collection of samples at appropriate operating conditions; 

 Proper operation of the dilution sampling system; 

 Performance of calibration error checks; 

 Performance of drift checks; and 

 Collection of samples per the protocol and the applicable methods. 

A review of the data quality associated with these measurements indicate that these data 

are representative and usable for the purpose intended for Runs 1,2, and 4 of the February 2008 

testing. The use of the detection limit strategy developed exclusively for this project provides a 

conservative estimate of VOC concentrations in the vent gas. The issues identified during the 

data quality review are discussed on a per run basis: 

Run 1 

The Source Test Protocol for the Coker Unit Steam Vent specified that at least two THC 

analyzers, calibrated at different yet complementary ranges, would be used to quantify the entire 
Source Test Report – Coker Steam Vent 5-4 40941948.04 

range of total hydrocarbon emissions in the vent gas stream. Due to an equipment failure, only 

one THC analyzer was used to quantify total hydrocarbon emissions during Run 1. The THC1 

analyzer used during Run 1 was operated with an instrument range of 10,000 ppm and subjected 

to the entire scope of calibration error testing defined in the protocol for multiple analyzers. The 

THC1 analyzer demonstrated sufficient linearity across the spans of 100 ppm and 10,000 ppm 

for the purposes of this source test. The effect of using only one THC analyzer during Run 1 on 

overall data quality is negligible. 

The post-run drift determination was performed on THC1 upstream of the dilution system 

using a calibration gas used during the calibration error test for the 100 ppm span. No post-run 

drift determination was performed using a calibration gas used during the calibration error test 

for the 10,000 ppm span. During Run 1, THC1 recorded diluted concentrations above 100 ppm 

for approximately 16% of the total sampling duration. No diluted concentrations exceeded 932.9 

ppm. The certified concentration (taking the average dilution ratio into account) of the 

calibration gas used for post-run drift determination was 37.08 ppm, or 4% of the highest value 

recorded by the THC1 analyzer during the run. The post-run drift determination with this 

calibration gas met the method requirement of 3% of the span (100 ppm). Furthermore, the 

concentration of this calibration gas is comparable to the average diluted concentration measured 

by THC1 over the entire run (48.1 ppmw). The use of the 37.08 ppm calibration gas for the 

determination of analyzer drift is acceptable for the purposes of this source test because it 

represents the majority (84%) of the measurements recorded by the analyzer during Run 1. 

Run 2 

URS personnel were required to exit the Coker Unit at least 15 minutes prior to the drum 

de-heading and coke-cutting procedure and did not have adequate time to perform all of the 

quality assurance checks required by EPA Method 25A and Other Test Method 12 and described 

in the Source Test Protocol for the Coker Unit Steam Vent. As a result, no zero drift 

determination was performed on THC2 or THC1 during Run 2. In addition, post-run calibration 

drift determinations were made on THC1 during Run 2, but not according to the procedures 

specified in EPA Method 25A or the Source Test Protocol for the Coker Unit Steam Vent. 

During Run 2, THC1 recorded diluted concentrations above 100 ppm for approximately 

4% of the total sampling duration. No diluted concentrations exceeded 919.5 ppm. The certified 

concentration (taking the average dilution ratio into account) of the calibration gas used for postrun drift determination was 37.95 ppm, or 4% of the highest value recorded by the THC1 

analyzer during the run. The post-run drift determination with this calibration gas met the 

method requirement of 3% of the span (10,000 ppm). Furthermore, the concentration of this 

calibration gas is comparable to the average diluted concentration measured by THC1 over the 

entire run (17.9 ppmw). The use of the 37.95 ppm calibration gas for the determination of THC1 
Source Test Report – Coker Steam Vent 5-5 40941948.04 

analyzer drift is acceptable for the purposes of this source test because it represents the majority 

(96%) of the measurements recorded by the analyzer during Run 2. 

The acceptable data quality associated with quantification of total VOC concentration 

during Run 2 is unaffected by the absence of post-run zero drift determinations for either THC 

analyzer. The THC data was reduced with a conservative detection limit of 2% of span 

multiplied by the average dilution ratio, amounting to an effective detection limit of 233.1 ppm 

for Run 2. Any concentration measured by the THC analyzers below this detection limit were 

substituted with the value of 233.1 ppm for the purposes of this source test. The drift of an 

instrument response close to zero is of no significant consequence with the use of this data 

reduction strategy. 

Run 3 

URS personnel were required to exit the Coker Unit at least 15 minutes prior to the drum 

de-heading and coke-cutting procedure and did not have adequate time to perform all of the 

quality assurance checks required by EPA Method 25A and Other Test Method 12 and described 

in the Source Test Protocol for the Coker Unit Steam Vent. As a result, post-run calibration drift 

determinations were made on THC1 during Run 3, but not according to the procedures specified 

in EPA Method 25A or the Source Test Protocol for the Coker Unit Steam Vent. 

During Run 3, THC1 recorded diluted concentrations above 100 ppm for approximately 

37% of the total sampling duration. No diluted concentrations exceeded 2924.1 ppm. The 

certified concentration (taking the average dilution ratio into account) of the calibration gas used 

for post-run drift determination was 39.69 ppm, or 1% of the highest value recorded by the 

THC1 analyzer during the run. The post-run drift determination with this calibration gas met the 

method requirement of 3% of the span (10,000 ppm). However, the concentration of this 

calibration gas is not comparable to the average diluted concentration measured by THC1 over 

the entire run (639.5 ppmw). The use of the 39.69 ppm calibration gas for the determination of 

THC1 analyzer drift is not acceptable for the purposes of this source test. A significant degree of 

error may be associated with the total VOC results for Run 3. 

Run 4 

URS personnel were required to exit the Coker Unit at least 15 minutes prior to the drum 

de-heading and coke-cutting procedure and did not have adequate time to perform all of the 

quality assurance checks required by EPA Method 25A and Other Test Method 12 and described 

in the Source Test Protocol for the Coker Unit Steam Vent. As a result, post-run calibration drift 

determinations were made on THC1 during Run 4, but not according to the procedures specified 

in EPA Method 25A or the Source Test Protocol for the Coker Unit Steam Vent. 
Source Test Report – Coker Steam Vent 5-6 40941948.04 

During Run 4, THC1 recorded diluted concentrations above 100 ppm for approximately 

3% of the total sampling duration. No diluted concentrations exceeded 2622.2 ppm. The 

certified concentration (taking the average dilution ratio into account) of the calibration gas used 

for post-run drift determination was 41.28 ppm, or 2% of the highest value recorded by the 

THC1 analyzer during the run. The post-run drift determination with this calibration gas met the 

method requirement of 3% of the span (10,000 ppm). Furthermore, the concentration of this 

calibration gas is comparable to the average diluted concentration measured by THC1 over the 

entire run (50.5 ppmw). The use of the 41.28 ppm calibration gas for the determination of THC1 

analyzer drift is acceptable for the purposes of this source test because it represents the majority 

(97%) of the measurements recorded by the analyzer during Run 4. 

5.3 NMNE VOC Concentration in the Vent Gas 

QA/QC activities associated with the measurement of methane, ethane, and total VOC 

concentrations and described in the preceding sections are sufficient for the review of data 

quality associated with the quantification of NMNE VOC concentrations in the vent gas. A 

review of the data quality associated with these measurements indicate that these data are 

representative and usable for the purpose of calculating NMNE VOC concentrations for Runs 1 

and 2 of the February 2008 testing. 

5.4 Volumetric Flow Rate of the Vent Gas 

QA/QC activities associated with the collection of the emissions gas samples for the 

determination of vent gas volumetric flow rate include: 

 Use of pre-printed data sheets; 

 Use of calibrated sampling equipment; 

 Collection of samples at appropriate operating conditions; 

 Performance of sampling system leak checks; and 

 Collection of samples per the protocol and the applicable methods. 

QA/QC activities associated with the analysis of emissions gas samples include: 

 Calibration of the analytical instrumentation; 

 Use of documented calibration standards; and 

 Analysis of samples per the protocol and the applicable methods. 

A review of the data quality associated with these measurements indicate that these data 

are representative and usable for the purpose intended. The issues identified during the data 

quality review is discussed on a per run basis: 
Source Test Report – Coker Steam Vent 5-7 40941948.04 

Runs 1-4 

According to the Source Test Protocol for the Coker Unit Steam Vent, the sampling probe 

and filter were to be maintained at 300°F ±25°F to keep the steam vent gas stream in the gas 

phase until condensation in the sampling train condenser coil and impingers. However, this 

approach was designed for the use of standard sampling probes and specialized sampling ports, 

not a shepherd’s hook apparatus. URS personnel could not maintain the shepherd’s hook probe 

temperature (reflected on URS data sheets as two components: “Probe” and “Hook Probe”) at 

300°F ±25°F, or even at a stable temperature consistently above the vent gas temperature, due to 

the damage to probe insulation caused by the high-velocity gas stream (at times >300 ft/sec, or 

200 mph). 

These temperature conditions achieved with the shepherd’s hook probe apparatus 

possibly resulted in a low bias to measured moisture concentrations because moisture could have 

condensed and remained inside of the probe apparatus – or drained back out into the vent – 

before condensation and collection in the appropriate section of the sampling train for 

gravimetric determination. Test Runs 2 and 3, with measured moisture concentrations of 91.52 

and 91.41%, respectively, would be impacted the greatest. However, the slight increase in the 

measured moisture concentration in a range of 90-100% would have an insignificant impact on 

NMNE VOC mass emission rates. By substituting the highest moisture concentration measured 

during the February 2008 testing (98.68%) into the applicable calculations for the NMNE VOC 

mass emission rate during Run 2, the mass emission rate would increase by 0.2 lb/cycle – a 

relative deviation of 2%. This degree of low bias is acceptable for the purposes of this source 

test. 

 URS personnel did not include a filter in the EPA Method 2/4 sampling train due to 

concerns that the filter would quickly become clogged with moisture and/or particulate matter 

when maintained at temperatures below 300°F ±25°F. As a result, small amounts of particulate 

matter were visible in the condensate collected in the sampling train impingers during all four 

test runs. Upon visual inspection, URS personnel estimated that less than 20 g of particulate 

were collected in the impingers during any given sampling run. The average amount of moisture 

collected during the source test was 2000 ml, or 2000 g, and this degree of high bias (2%) is 

acceptable for the purposes of this source test. 

Accurate static pressure measurements for use in the determination of vent gas velocity 

were not successfully obtained with a magnehelic gauge until the latter half of Run 4, due to the 

clogging of the static pressure probe with moisture and particulate matter and other equipment 

malfunctions. The average of the accurate static pressure readings (measured from 18:27 to 

18:39) obtained during Run 4 was applied to all vent gas velocity calculations for Run 1, 2, 3 and 

t 300°

300°

w 300°

 REDACTED
Source Test Report – Coker Steam Vent 5-8 40941948.04 

4. This missing data procedure the most appropriate means for estimating Coker Steam Vent 

volumetric flow rate during the February 2008 testing. 

URS has conducted testing on similar Coker Steam Vent sources and obtained reliable 

static pressure measurements between 0 and -30” H2O. In addition, vent gas static pressure 

appears to equilibrate to near atmospheric pressure during the first hour of a venting cycle. By 

substituting a reasonable, most extreme, and constant static pressure of -30” H2O into the 

calculations per time interval for Run 1, the NMNE VOC mass emission rate is reduced by 5.739 

lb/cycle, or approximately 4% relative deviation. By substituting a reasonable, most extreme, 

and constant static pressure of -30” H2O into the calculations per time interval for Run 2, the 

NMNE VOC mass emission rate is reduced by 0.340 lb/cycle, or approximately 2% relative 

deviation. The high bias to NMNE VOC mass emission rates of applying the average static 

pressure of -1.36” H2O obtained directly during Run 4 is acceptable for the purposes of this 

source test. 

Run 2 

URS personnel were required to exit the Coker Unit at least 15 minutes prior to the drum 

de-heading and coke-cutting procedure and did not have adequate time to perform all of the 

quality assurance checks required by EPA Method 2 and 4. As a result, a post-test leak test of 

the EPA Method 2/4 sampling train was not performed following Run 2. The pre-run leak test 

was used to determine that no dry gas volume collected with the sampling train should be 

corrected according to EPA Equation 5-1(a) Case I. 

In similar cases during typical source testing efforts, a comparison of the moisture 

concentrations obtained during several test runs performed on a source can generate adequate 

evidence to determine whether or not excessive sampling train leakage occurred in a suspect 

sampling train. However, the batch nature of the coking process and variable measured moisture 

concentrations precludes such a comparison. A review of the average sampling rates achieved 

for Runs 1-4 (0.106, 0.214, 0.235, 0.121 cfm, respectively) indicates that the EPA Method 2/4 

sampling train achieved an average sampling rate within the range of sampling rates encountered 

during the February 2008 testing. 

 It is important to note that while variable moisture concentrations measured in the Coker 

Steam Vent gas stream will raise or lower the reported dry concentration of NMNE VOCs, they 

will have negligible impact on the calculation of NMNE VOC mass emission rates. The 

presence of a significant leak in the EPA Method 2/4 sampling train during Run 2 would bias the 

moisture concentration results low. By substituting the highest moisture concentration measured 

during the February 2008 testing (98.68%) into the applicable calculations for the NMNE VOC 
Source Test Report – Coker Steam Vent 5-9 40941948.04 

mass emission rate during Run 2, the mass emission rate would increase by 0.2 lb/cycle – a 

relative deviation of 2%. This degree of bias is acceptable for the purposes of this source test. 

5.5 Project Conclusion 

The accurate measurement of NMNE VOCs in the Coker Steam Vent gas stream is one 

of the primary concerns of the complex test program requested by EPA. EPA defines VOCs in 

40 CFR 51.100(s) as “any compound of carbon, excluding carbon monoxide, carbon dioxide, 

carbonic acid, metallic carbides or carbonates, and ammonium carbonate, which participates in 

atmospheric photochemical reactions.” 40 CFR 51.100(s)(1) also lists many organic compounds 

which have been determined to have negligible photochemical reactivity (e.g., methane and 

ethane) and may be excluded as VOC if accurately quantified. 

EPA requested in the “2007 Section 114 Request” that EPA Method 25A must be used in 

combination with EPA Methods 1, 2, 3, 18 and the dilution methods of Other Test Method 12 to 

determine the concentration and mass emission rates of non-methane/non-ethane organic 

compounds. However, it is well known that the FIDs used in these methods produce a response 

proportional to the carbon-hydrogen bonds present in the sample gas and do not differentiate 

between different classes of organic compounds. Furthermore, FIDs have varying sensitivity for 

specific classes of organic compounds. 

It is difficult to categorize the bias inherent in the use of an FID for the measurement of 

VOCs using EPA Method 25A without a greater understanding of the typical concentrations of 

organic compounds present in the Coker Steam Vent gas stream. With the additional pending 

sampling of SVOCs using the SW-846 Method 0010 sampling train, it is very likely that some 

selected SVOCs will be quantified with the FIDs used by the THC analyzers and reported as 

VOCs. This potential high bias of VOC measurement and double-reporting of an unknown 

fraction of the SVOCs present in the Coker Steam Vent gas stream obtained with the SW-846 

Method 0010 sampling trains must be carefully considered when evaluating the data produced 

through the future source testing required by EPA. 

The results presented in this report for the February 2008 testing of the Coker Steam Vent 

indicate that the accurate and precise measurement of total VOCs, including compounds with 

negligible photochemical reactivity for potential exclusion as VOCs, will be a significant 

challenge during the pending test effort described in the protocol. The dynamic characteristics 

of the venting cycle demand a data reduction effort based upon the development of specific 

venting cycle time intervals, as vent gas volumetric flow rate and VOC concentrations change 

quickly over a short period of time and do not seem to be directly related. However, the 

incompatibility of the total VOC and methane and ethane concentration results obtained for Run 
Source Test Report – Coker Steam Vent 5-10 40941948.04 

3 warrants further consideration of the appropriateness of subtracting data obtained from EPA 

Method 18 from data obtained with EPA Method 25A. 

The EPA Method 18 pre-survey test effort (described in the Source Test Protocol for the 

Coker Unit Steam Vent) will provide initial data for the speciation of VOCs in the Coker Steam 

Vent gas stream. This data will be used to determine the VOC compounds to be analyzed during 

the source test using a gas chromatograph (GC) and FID by EPA Method 18. However, it is 

important to note that the pre-survey data should also be used to reevaluate whether or not EPA 

Method 25A is appropriate for the accurate quantification of VOC concentrations in the Coker 

Steam Vent gas stream. The pre-survey samples will be analyzed by GC and mass spectrometry 

(MS) and will provide much more comprehensive data of the VOC concentrations in the Coker 

Steam Vent gas stream. CITGO will report the results of the pre-survey as soon as possible after 

laboratory analytical data are obtained and will present further discussion of VOC measurement 

using EPA Method 25A based upon these pre-survey results. Alternative VOC measurement 

methods and strategies may also be included in subsequent communication to EPA. 
APPENDIX A 

Correspondence

And Technical Information 




EM SOP No.: 002-PS1 

Procedure for Low-Flow Calibration of Effective Date: 15 March 2008 

Dry Gas Meter Using a Flow Calibrator Expiration Date: 15 march 2009 

THIS DOCUMENT IS CONSIDERED PROPRIETARY BY URS CORPORATION.

Page 1 of 6

EM SOP-002-PS1 

Procedure for Low-Flow Calibration of 

Dry Gas Meter Using a Flow Calibrator 

SOP Component Section

Identification of the test method 1 

Applicable matrix or matrices 2 

Detection limit 2 

Scope and application 1, 2 

Summary of test method 1

Definitions 4

Safety 3

Equipment and supplies 5

Reagents and standards 5

Sample collection, preservation, storage, 

handling, and chain-of-custody 

Not

Applicable

Quality control 7 

Calibration 6 

SOP Component Section

Procedure 6

Calculations 8

Method performance 2

Pollution prevention 10

Data assessment/acceptance criteria for 

QC 7

Corrective actions for unacceptable data 7

Contingency for handling unacceptable 

data 7

Waste management 10

Record keeping 9

References 11

Tables, diagrams, etc. 12

1.0 Purpose and Scope 

This document describes the procedure used to calibrate the dry gas meters internal to sampling 

consoles. Dry gas meters are calibrated, and the calibration checked, by comparing the volume 

of gas that passes through the dry gas meter to the volume of gas that passes through a traceable 

flow calibrator. This document specifies identification procedures, calibration frequency, 

acceptance criteria, corrective actions, and data forms to be used for record keeping. 

Any dry gas meter calibrated per this SOP is considered acceptable for use. 
EM SOP No.: 002-PS1 

Procedure for Low-Flow Calibration of Effective Date: 15 March 2008 

Dry Gas Meter Using a Flow Calibrator Expiration Date: 15 march 2009 

THIS DOCUMENT IS CONSIDERED PROPRIETARY BY URS CORPORATION.

Page 2 of 6

2.0 Applicability 

This SOP applies to dry gas meters that are used in applications requiring a sampling rate 

between 1.0 and 9.0 liters per minute. This SOP is to be used on a project-specific basis when 

other standing calibration procedures do not adequately characterize dry gas meter performance. 

As this is a calibration, there is no sensitivity or detection limit associated with the SOP. A dry 

gas meter calibrated per this SOP is acceptable for use. A dry gas meter that does not meet the 

criteria of this SOP must not be used. 

3.0 Safety 

This activity will be performed within the URS facilities. Operations under this SOP must 

comply with URS health and safety plans. This activity has no additional safety requirements. 

4.0 Definitions 

Reserved.

5.0 Equipment and Supplies 

• Dry gas meter. 

• DryCal Flow Calibrator –calibrated to EPA standards by third party with appropriate 

documentation. 

• Stopwatch

6.0 Procedure 

6.1 Pre sampling calibration procedure: 

6.1.1 The dry gas meter must be calibrated at five different flow rates, in 

duplicate, by comparison of gas flow through the dry gas meter and 

through the DryCal flow calibrator.

6.1.1.1 Five different flow rates must be used. These span the range of 

(nominally) 1.0 to 9.0 liters per minute (0.035 to 0.32 cubic 

feet per minute). 

6.1.2 FREQUENCY: The calibration must be performed before and after each 

field program where low-flow is necessary. In general, this procedure is 

described for a dry gas meter contained within a sampling console. It may 

be necessary to modify some of the connection steps slightly for 

calibration of a stand-alone dry gas meter. 

6.1.3 All of these activities must be documented on a data sheet. An example 

data sheet is provided in Figure 1. Record console and calibrator 

identification numbers, date, and operator on the data sheet.

6.1.4 Record barometric pressure and ambient temperature. 
EM SOP No.: 002-PS1 

Procedure for Low-Flow Calibration of Effective Date: 15 March 2008 

Dry Gas Meter Using a Flow Calibrator Expiration Date: 15 march 2009 

THIS DOCUMENT IS CONSIDERED PROPRIETARY BY URS CORPORATION.

Page 3 of 6

6.1.5 Connect the outlet of the flow calibrator to the inlet of the console.

6.1.6 Record the initial volume from the console. 

6.1.7 Start the stopwatch and the pump. 

6.1.8 Record the DryCal flow rate every time the DryCal flow calibrator reaches 

its tenth data acquisition in the averaging series. 

6.1.9 After the desired run time has elapsed, close the pump and record the final 

volume from the console. 

6.1.10 Repeat Steps 6.1.5 through 6.1.9. There must be duplicate calibration runs 

for each flow rate.

6.1.11 Repeat Steps 6.1.5 through 6.1.10 at the next four flow rates. There must 

be duplicate calibration runs for each flow rate. 

6.1.12 Review the data sheet, and ensure that it is filled out completely. 

6.2 Post sampling calibration procedure: 

6.2.1 The calibration of the dry gas meter must be checked at the flow rates 

under which sampling was performed, in duplicate, by comparison of gas 

flow through the dry gas meter and through the DryCal flow calibrator.

6.2.2 Perform steps 6.1.3 through 6.1.10 at the flow rate(s) which the sampling 

was performed.

7.0 Quality Control 

Quality assurance and quality control are addressed by following the steps outlined in this SOP. 

No additional activities are necessary. 

If the DGM fails this calibration check during a pre-test calibration check, it must not be used in 

this application. If the DGM fails this calibration check during a post-test calibration check, the 

project team must be notified about the results.

8.0 Calculations 

Calculations are performed using documented software. Spreadsheets that are documented to be 

correct are maintained on the local network. For each of the runs above, calculate the volume of 

gas passing through the flow calibrator using the following equation: 

Vcal  FlowRatecal  time
EM SOP No.: 002-PS1 

Procedure for Low-Flow Calibration of Effective Date: 15 March 2008 

Dry Gas Meter Using a Flow Calibrator Expiration Date: 15 march 2009 

THIS DOCUMENT IS CONSIDERED PROPRIETARY BY URS CORPORATION.

Page 4 of 6

where:

 Vcal = Volume of gas passing through the flow calibrator 

 FlowRatecal = Flow rate of gas passing through the flow calibrator (averaged 

for the run).

 Time = Duration of the calibration or calibration check run.

For each of the runs above, calculate the volume of gas passing through the dry gas meter using 

the following equation: 

Vcon  VolReadingfinal 
 VolReadinginitial

where:

 Vcon = Volume of gas passing through the dry gas meter 

 VolReadingfinal = Final Volume reading from the faceplate of the dry gas meter 

 VolReadinginitial = Initial Volume reading from the faceplate of the dry gas meter 

For each of the runs above, calculate the dry gas meter calibration factor, Y, using the following 

equation:

con

cal

V

V Y 

For the initial calibration, average the pair of DGM calibration factors generated at each flow 

rate. The average Y calculated must be between 0.90 and 1.10, and each individual Y at each 

flow rate must be within 2% of the average Y at each flow rate. 

Each average Y is applicable to a range of flow rates that may be observed during sampling. The 

applicability range of each Y spans from the midpoint between the flow rate it was calculated at 

and the next lower flow rate to the midpoint between the flow rate it was calculated at and the 

next higher flow rate. 

For the post calibration check, average the two individual DGM calibration factors. The average 

Y must be within 5% of the average Y from the initial calibration at the same flowrate. 

9.0 Record Keeping 

As noted above, all calibrations must be recorded on individual data sheets. If a computer 

program is used to perform the calculations, the handwritten data sheet must be kept as well as 

the computer output. An example data sheet is shown in Section 12.0 – Exhibits.

Documentation of these activities is kept as part of the project files. 

10.0 Pollution Prevention and Waste Management 

Reserved.
EM SOP No.: 002-PS1 

Procedure for Low-Flow Calibration of Effective Date: 15 March 2008 

Dry Gas Meter Using a Flow Calibrator Expiration Date: 15 march 2009 

THIS DOCUMENT IS CONSIDERED PROPRIETARY BY URS CORPORATION.

Page 5 of 6

11.0 References 

Government Printing Office. “Method 5 – Determination of Particulate Emissions from 

Stationary Sources.” Code of Federal Regulations, Title 40, Part 60, Appendix A.

Government Printing Office. “Method 30B – Determination of Total Vapor Phase Mercury 

emissions From Coal Fired Combustion Sources Using Carbon Sorbent Traps.” Code of 

Federal Regulations, Title 40, Part 60, Appendix A. 

USEPA. Quality Assurance Handbook for Air Pollution Measurement Systems: Volume III, 

Stationary Source-Specific Methods, EPA/600/r-94/038c, September 1994. 

12.0 Exhibits 

Figure 1. Example Data Sheet 
EM SOP No.: 002-PS1 

Procedure for Low-Flow Calibration of Effective Date: 15 March 2008 

Dry Gas Meter Using a Flow Calibrator Expiration Date: 15 march 2009 

Dry Gas Meter Calibration vs DryCal 

Console ID Barometric Pressure (“ Hg) 

DryCal ID Ambient Temperature (oF) 

Initials Initials Calibrated by Date Reviewed by Date 

Run 1A Run 1B Run 2A Run 2B Run 3A Run 3B Run 4A Run 4B Run 5A Run 5B 

Nominal Flowrate (ft3/min) 

Start Time (hh:mm) 

DGM Initial Reading (ft3) 

Stop Time (hh:mm) 

DGM Final Reading (ft3) 

Test Duration (min) 

Flowrate

(ft3

/min) 

Flowrate 

(ft3/min) 

Flowrate

(ft3/min) 

Flowrate 

(ft3/min) 

Flowrate 

(ft3/min) 

Flowrate 

(ft3/min) 

Flowrate 

(ft3/min) 

Flowrate 

(ft3/min) 

Flowrate 

(ft3/min) 

Flowrate 

(ft3/min) 

 

 

Notes CDS-23 Dry Gas Meter vs DryCal 

Revision Date: March 2008 

Figure 1. Example Data Sheet 

THIS DOCUMENT IS CONSIDERED PROPRIETARY BY URS CORPORATION.

Page 6 of 6
APPENDIX B 

EPA Method 25A Raw Data 

And Calibration Information 









CITGO

Coker Steam Vent Testing

URS Raw THC Data

Run 1

Average Dilution Ratio (High)= 119.0 HIGH - THC1 LOW - THC2

24 Hour Time Elapsed

Time

RAW

(ppmw)

RAW

(ppmw)

RAW x DLR

(ppmw)

Actual

(ppmw)

02/24/2008 05:04:05 0:00:00 -1.1 -5.8 -130.8 237.9

02/24/2008 05:04:15 0:00:10 -1.4 -5.8 -166.5 237.9

02/24/2008 05:04:25 0:00:20 -1.3 -5.8 -154.6 237.9

02/24/2008 05:04:35 0:00:30 -0.9 -5.8 -107.1 237.9

02/24/2008 05:04:45 0:00:40 -1.3 -5.8 -154.6 237.9

02/24/2008 05:04:55 0:00:50 -0.7 -5.8 -83.3 237.9

02/24/2008 05:05:05 0:01:00 -0.2 -5.8 -23.8 237.9

02/24/2008 05:05:15 0:01:10 -0.6 -5.8 -71.4 237.9

02/24/2008 05:05:25 0:01:20 -0.1 -5.8 -11.9 237.9

02/24/2008 05:05:35 0:01:30 0.4 -5.8 47.6 237.9

02/24/2008 05:05:45 0:01:40 0.1 -5.8 11.9 237.9

02/24/2008 05:05:55 0:01:50 -0.7 -5.8 -83.3 237.9

02/24/2008 05:06:05 0:02:00 -1.4 -5.8 -166.5 237.9

02/24/2008 05:06:15 0:02:10 -2.1 -5.8 -249.8 237.9

02/24/2008 05:06:25 0:02:20 -3.3 -5.8 -392.5 237.9

02/24/2008 05:06:35 0:02:30 -4.1 -5.8 -487.7 237.9

02/24/2008 05:06:45 0:02:40 -4.5 -5.8 -535.3 237.9

02/24/2008 05:06:55 0:02:50 -4.6 -5.8 -547.2 237.9

02/24/2008 05:07:05 0:03:00 -4.8 -5.8 -571.0 237.9

02/24/2008 05:07:15 0:03:10 -4.6 -5.8 -547.2 237.9

02/24/2008 05:07:25 0:03:20 -4.8 -5.8 -571.0 237.9

02/24/2008 05:07:35 0:03:30 -4.8 -5.8 -571.0 237.9

02/24/2008 05:07:45 0:03:40 -4.8 -5.8 -571.0 237.9

02/24/2008 05:07:55 0:03:50 -4.8 -5.8 -571.0 237.9

02/24/2008 05:08:05 0:04:00 -4.8 -5.8 -571.0 237.9

02/24/2008 05:08:15 0:04:10 -5.0 -5.8 -594.8 237.9

02/24/2008 05:08:25 0:04:20 -5.0 -5.8 -594.8 237.9

02/24/2008 05:08:35 0:04:30 -4.8 -5.8 -571.0 237.9

02/24/2008 05:08:45 0:04:40 -4.8 -5.8 -571.0 237.9

02/24/2008 05:08:55 0:04:50 -4.8 -5.8 -571.0 237.9

02/24/2008 05:09:05 0:05:00 -4.8 -5.8 -571.0 237.9

02/24/2008 05:09:15 0:05:10 -4.8 -5.8 -571.0 237.9

02/24/2008 05:09:25 0:05:20 -4.8 -5.8 -571.0 237.9

02/24/2008 05:09:35 0:05:30 -4.8 -5.8 -571.0 237.9

02/24/2008 05:09:45 0:05:40 -5.0 -5.8 -594.8 237.9

02/24/2008 05:09:55 0:05:50 -4.8 -5.7 -571.0 237.9

02/24/2008 05:10:05 0:06:00 0.6 -5.8 71.4 237.9

02/24/2008 05:10:15 0:06:10 -1.1 -5.7 -130.8 237.9

02/24/2008 05:10:25 0:06:20 -3.5 -5.8 -416.3 237.9

02/24/2008 05:10:35 0:06:30 -4.0 -5.7 -475.8 237.9

02/24/2008 05:10:45 0:06:40 -4.1 -5.8 -487.7 237.9

02/24/2008 05:10:55 0:06:50 -4.1 -5.7 -487.7 237.9

02/24/2008 05:11:05 0:07:00 -4.1 -5.8 -487.7 237.9

02/24/2008 05:11:15 0:07:10 -4.3 -5.7 -511.5 237.9

02/24/2008 05:11:25 0:07:20 -4.5 -5.8 -535.3 237.9

02/24/2008 05:11:35 0:07:30 -4.3 -5.7 -511.5 237.9

02/24/2008 05:11:45 0:07:40 -4.3 -5.8 -511.5 237.9

02/24/2008 05:11:55 0:07:50 -4.5 -5.7 -535.3 237.9

02/24/2008 05:12:05 0:08:00 -4.5 -5.8 -535.3 237.9

02/24/2008 05:12:15 0:08:10 -4.3 -5.7 -511.5 237.9

02/24/2008 05:12:25 0:08:20 -4.5 -5.7 -535.3 237.9

02/24/2008 05:12:35 0:08:30 -4.5 -5.7 -535.3 237.9

02/24/2008 05:12:45 0:08:40 -4.5 -5.7 -535.3 237.9

02/24/2008 05:12:55 0:08:50 -4.5 -5.7 -535.3 237.9

02/24/2008 05:13:05 0:09:00 -4.5 -5.7 -535.3 237.9

02/24/2008 05:13:15 0:09:10 -4.5 -5.7 -535.3 237.9

02/24/2008 05:13:25 0:09:20 -4.5 -5.7 -535.3 237.9

02/24/2008 05:13:35 0:09:30 -4.5 -5.7 -535.3 237.9

02/24/2008 05:13:45 0:09:40 -4.5 -5.7 -535.3 237.9

02/24/2008 05:13:55 0:09:50 -4.5 -5.7 -535.3 237.9

02/24/2008 05:14:05 0:10:00 -4.5 -5.7 -535.3 237.9

02/24/2008 05:14:15 0:10:10 -4.5 -5.7 -535.3 237.9

02/24/2008 05:14:25 0:10:20 -4.5 -5.7 -535.3 237.9

02/24/2008 05:14:35 0:10:30 -4.5 -5.7 -535.3 237.9

02/24/2008 05:14:45 0:10:40 -4.3 -5.7 -511.5 237.9

02/24/2008 05:14:55 0:10:50 -4.3 -5.7 -511.5 237.9

02/24/2008 05:15:05 0:11:00 -4.3 -5.7 -511.5 237.9

02/24/2008 05:15:15 0:11:10 -4.3 -5.7 -511.5 237.9

02/24/2008 05:15:25 0:11:20 -4.3 -5.7 -511.5 237.9

02/24/2008 05:15:35 0:11:30 -4.5 -5.7 -535.3 237.9

02/24/2008 05:15:45 0:11:40 -4.5 -5.7 -535.3 237.9

02/24/2008 05:15:55 0:11:50 -4.3 -5.7 -511.5 237.9

02/24/2008 05:16:05 0:12:00 -4.3 -5.7 -511.5 237.9

02/24/2008 05:16:15 0:12:10 -4.3 -5.7 -511.5 237.9

02/24/2008 05:16:25 0:12:20 -4.3 -5.7 -511.5 237.9

02/24/2008 05:16:35 0:12:30 -4.3 -5.7 -511.5 237.9

02/24/2008 05:16:45 0:12:40 -4.3 -5.7 -511.5 237.9

HIGH THC1

1

05:04:05 0:00:00

05:04:15 0:00:10

05:04:25 0:00:20

05:04:35 0:00:30

05:04:45 0:00:40

05:04:55 0:00:50

05:05:05 0:01:00

05:05:15 0:01:10

:05:35 0:01:30

05:05:25 0:01:20

05:

05:05:55 0:01:50

05:05:45 0:01:40

05:06:15 0:02:10

05:06:05 0:02:00

05:06:25 0:02:20

05:06:35 0:02:30

05:06:45 0:02:40

05:06:55 0:02:50

05:07:05 0:03:00

05:07:15 0:03:10

05:07:25 0:03:20

05:07:35 0:03:30

05:07:45 0:03:40

05:07:55 0:03:50

05:08:05 0:04:00

05:08:15 0:04:10

05:08:25 0:04:20

05:08:35 0:04:30

05:08:45 0:04:40

05:08:55 0:04:50

05:09:05 0:05:00

05:09:15 0:05:10

05:09:25 0:05:20

05:09:35 0:05:30

05:09:55 0:05:50

05:09:45 0:05:40

05:10:05 0:06:00

05:10:15 0:06:10

05:10:25 0:06:20

05:10:35 0:06:30

05:10:45 0:06:40

05:10:55 0:06:50

05:11:05 0:07:00

05:11:25 0:07:20

05:11:15 0:07:10

05:11:35 0:07:30

05:11:45 0:07:40

05:11:55 0:07:50

05:12:05 0:08:00

05:12:15 0:08:10

05:12:25 0:08:20

05:12:35 0:08:30

05:12:45 0:08:40

05:12:55 0:08:50

05:13:05 0:09:00

05:13:15 0:09:10

05:13:25 0:09:20

05:13:35 0:09:30

05:13:45 0:09:40

05:13:55 0:09:50

05:14:05 0:10:00

05:14:15 0:10:10

05:14:25 0:10:20

05:14:35 0:10:30

05:14:55 0:10:50

05:14:45 0:10:40

05:15:15 0:11:10

05:15:05 0:11:00

05:15:25 0:11:20

05:15:35 0:11:30

05:15:45 0:11:40

05:15:55 0:11:50

05:16:05 0:12:00

05:16:15 0:12:10

05:16:25 0:12:20

05:16:35 0:12:30

05:16:45 0:12:40

 REDACTED
CITGO

Coker Steam Vent Testing

URS Raw THC Data

Run 1

Average Dilution Ratio (High)= 119.0 HIGH - THC1 LOW - THC2

24 Hour Time Elapsed

Time

RAW

(ppmw)

RAW

(ppmw)

RAW x DLR

(ppmw)

Actual

(ppmw)

HIGH THC1

02/24/2008 05:16:55 0:12:50 -4.3 -5.7 -511.5 237.9

02/24/2008 05:17:05 0:13:00 -4.3 -5.7 -511.5 237.9

02/24/2008 05:17:15 0:13:10 -4.3 -5.7 -511.5 237.9

02/24/2008 05:17:25 0:13:20 -4.3 -5.7 -511.5 237.9

02/24/2008 05:17:35 0:13:30 -4.3 -5.7 -511.5 237.9

02/24/2008 05:17:45 0:13:40 -4.3 -5.7 -511.5 237.9

02/24/2008 05:17:55 0:13:50 -4.5 -5.7 -535.3 237.9

02/24/2008 05:18:05 0:14:00 -4.3 -5.7 -511.5 237.9

02/24/2008 05:18:15 0:14:10 -4.3 -5.7 -511.5 237.9

02/24/2008 05:18:25 0:14:20 -4.3 -5.7 -511.5 237.9

02/24/2008 05:18:35 0:14:30 -4.3 -5.7 -511.5 237.9

02/24/2008 05:18:45 0:14:40 -4.0 -5.7 -475.8 237.9

02/24/2008 05:18:55 0:14:50 -3.6 -5.7 -428.2 237.9

02/24/2008 05:19:05 0:15:00 -3.3 -5.7 -392.5 237.9

02/24/2008 05:19:15 0:15:10 -2.8 -5.7 -333.1 237.9

02/24/2008 05:19:25 0:15:20 -2.4 -5.7 -285.5 237.9

02/24/2008 05:19:35 0:15:30 -2.4 -5.7 -285.5 237.9

02/24/2008 05:19:45 0:15:40 -2.3 -5.7 -273.6 237.9

02/24/2008 05:19:55 0:15:50 -2.4 -5.7 -285.5 237.9

02/24/2008 05:20:05 0:16:00 -2.3 -5.7 -273.6 237.9

02/24/2008 05:20:15 0:16:10 -2.4 -5.7 -285.5 237.9

02/24/2008 05:20:25 0:16:20 -2.4 -5.7 -285.5 237.9

02/24/2008 05:20:35 0:16:30 -2.6 -5.7 -309.3 237.9

02/24/2008 05:20:45 0:16:40 -2.8 -5.7 -333.1 237.9

02/24/2008 05:20:55 0:16:50 -2.8 -5.7 -333.1 237.9

02/24/2008 05:21:05 0:17:00 -2.8 -5.7 -333.1 237.9

02/24/2008 05:21:15 0:17:10 -2.9 -5.7 -345.0 237.9

02/24/2008 05:21:25 0:17:20 -2.4 -5.7 -285.5 237.9

02/24/2008 05:21:35 0:17:30 5.9 -5.7 701.8 701.8

02/24/2008 05:21:45 0:17:40 104.8 -5.7 12466.0 23790.0

02/24/2008 05:21:55 0:17:50 417.8 -5.7 49697.4 49697.4

02/24/2008 05:22:05 0:18:00 604.4 -5.7 71893.5 71893.5

02/24/2008 05:22:15 0:18:10 817.5 -5.7 97241.7 97241.7

02/24/2008 05:22:25 0:18:20 932.9 -5.7 110968.6 110968.6

02/24/2008 05:22:35 0:18:30 846.8 -5.7 100727.0 100727.0

02/24/2008 05:22:45 0:18:40 897.0 -5.7 106698.3 106698.3

02/24/2008 05:22:55 0:18:50 783.8 -5.7 93233.1 93233.1

02/24/2008 05:23:05 0:19:00 655.3 -5.7 77948.0 77948.0

02/24/2008 05:23:15 0:19:10 527.2 -5.7 62710.5 62710.5

02/24/2008 05:23:25 0:19:20 505.0 -5.7 60069.8 60069.8

02/24/2008 05:23:35 0:19:30 405.8 -5.7 48270.0 48270.0

02/24/2008 05:23:45 0:19:40 225.2 -5.7 26787.6 26787.6

02/24/2008 05:23:55 0:19:50 152.0 -5.7 18080.4 23790.0

02/24/2008 05:24:05 0:20:00 116.3 -5.7 13833.9 23790.0

02/24/2008 05:24:15 0:20:10 130.7 -5.7 15546.8 23790.0

02/24/2008 05:24:25 0:20:20 155.3 -5.7 18473.0 23790.0

02/24/2008 05:24:35 0:20:30 152.2 -5.7 18104.2 23790.0

02/24/2008 05:24:45 0:20:40 123.6 -5.7 14702.2 23790.0

02/24/2008 05:24:55 0:20:50 119.5 -5.7 14214.5 23790.0

02/24/2008 05:25:05 0:21:00 138.1 -5.7 16427.0 23790.0

02/24/2008 05:25:15 0:21:10 88.7 -5.7 10550.9 10550.9

02/24/2008 05:25:25 0:21:20 49.7 -5.7 5911.8 5911.8

02/24/2008 05:25:35 0:21:30 46.5 -5.7 5531.2 5531.2

02/24/2008 05:25:45 0:21:40 55.5 -5.7 6601.7 6601.7

02/24/2008 05:25:55 0:21:50 78.2 -5.7 9301.9 9301.9

02/24/2008 05:26:05 0:22:00 122.4 -5.7 14559.5 23790.0

02/24/2008 05:26:15 0:22:10 164.6 -5.7 19579.2 23790.0

02/24/2008 05:26:25 0:22:20 203.4 -5.7 24194.5 24194.5

02/24/2008 05:26:35 0:22:30 166.8 -5.7 19840.9 23790.0

02/24/2008 05:26:45 0:22:40 83.4 -5.7 9920.4 9920.4

02/24/2008 05:26:55 0:22:50 35.0 -5.7 4163.3 4163.3

02/24/2008 05:27:05 0:23:00 21.3 -5.7 2533.6 2533.6

02/24/2008 05:27:15 0:23:10 44.6 -5.7 5305.2 5305.2

02/24/2008 05:27:25 0:23:20 52.1 -5.7 6197.3 6197.3

02/24/2008 05:27:35 0:23:30 42.3 -5.7 5031.6 5031.6

02/24/2008 05:27:45 0:23:40 45.7 -5.7 5436.0 5436.0

02/24/2008 05:27:55 0:23:50 75.0 -5.7 8921.3 8921.3

02/24/2008 05:28:05 0:24:00 98.3 -5.7 11692.8 11692.8

02/24/2008 05:28:15 0:24:10 54.0 -5.7 6423.3 6423.3

02/24/2008 05:28:25 0:24:20 22.6 -5.7 2688.3 2688.3

02/24/2008 05:28:35 0:24:30 12.8 -5.7 1522.6 1522.6

02/24/2008 05:28:45 0:24:40 8.6 -5.7 1023.0 1023.0

02/24/2008 05:28:55 0:24:50 7.4 -5.7 880.2 880.2

02/24/2008 05:29:05 0:25:00 6.4 -5.7 761.3 761.3

02/24/2008 05:29:15 0:25:10 4.7 -5.7 559.1 559.1

02/24/2008 05:29:25 0:25:20 5.9 -5.7 701.8 701.8

02/24/2008 05:29:35 0:25:30 4.7 -5.7 559.1 559.1

2

05:16:55 0:12:50

05:17:05 0:13:00

05:17:15 0:13:10

05:17:25 0:13:20

05:17:35 0:13:30

05:17:45 0:13:40

05:17:55 0:13:50

05:18:05 0:14:00

05:18:15 0:14:10

05:18:25 0:14:20

05:18:35 0:14:30

05:18:45 0:14:40

05:19:05 0:15:00

05:18:55 0:14:50

05:19:15 0:15

05:19:25 0:15:20

5:10

05:19:35 0:15:30

 REDACTED
CITGO

Coker Steam Vent Testing

URS Raw THC Data

Run 1

Average Dilution Ratio (High)= 119.0 HIGH - THC1 LOW - THC2

24 Hour Time Elapsed

Time

RAW

(ppmw)

RAW

(ppmw)

RAW x DLR

(ppmw)

Actual

(ppmw)

HIGH THC1

02/24/2008 05:29:45 0:25:40 4.7 -5.7 559.1 559.1

02/24/2008 05:29:55 0:25:50 7.6 -5.7 904.0 904.0

02/24/2008 05:30:05 0:26:00 6.5 -5.7 773.2 773.2

02/24/2008 05:30:15 0:26:10 4.7 -5.7 559.1 559.1

02/24/2008 05:30:25 0:26:20 3.5 -5.7 416.3 416.3

02/24/2008 05:30:35 0:26:30 2.3 -5.7 273.6 273.6

02/24/2008 05:30:45 0:26:40 2.0 -5.7 237.9 237.9

02/24/2008 05:30:55 0:26:50 1.8 -5.7 214.1 237.9

02/24/2008 05:31:05 0:27:00 2.3 -5.7 273.6 273.6

02/24/2008 05:31:15 0:27:10 3.2 -5.7 380.6 380.6

02/24/2008 05:31:25 0:27:20 12.3 -5.7 1463.1 1463.1

02/24/2008 05:31:35 0:27:30 15.5 -5.7 1843.7 1843.7

02/24/2008 05:31:45 0:27:40 6.4 -5.7 761.3 761.3

02/24/2008 05:31:55 0:27:50 2.3 -5.7 273.6 273.6

02/24/2008 05:32:05 0:28:00 1.8 -5.7 214.1 237.9

02/24/2008 05:32:15 0:28:10 1.6 -5.7 190.3 237.9

02/24/2008 05:32:25 0:28:20 0.6 -5.7 71.4 237.9

02/24/2008 05:32:35 0:28:30 0.6 -5.7 71.4 237.9

02/24/2008 05:32:45 0:28:40 0.4 -5.7 47.6 237.9

02/24/2008 05:32:55 0:28:50 0.8 -5.7 95.2 237.9

02/24/2008 05:33:05 0:29:00 2.6 -5.7 309.3 309.3

02/24/2008 05:33:15 0:29:10 9.1 -5.7 1082.4 1082.4

02/24/2008 05:33:25 0:29:20 20.6 -5.7 2450.4 2450.4

02/24/2008 05:33:35 0:29:30 32.1 -5.7 3818.3 3818.3

02/24/2008 05:33:45 0:29:40 57.4 -5.7 6827.7 6827.7

02/24/2008 05:33:55 0:29:50 81.2 -5.7 9658.7 9658.7

02/24/2008 05:34:05 0:30:00 88.0 -5.7 10467.6 10467.6

02/24/2008 05:34:15 0:30:10 116.0 -5.7 13798.2 23790.0

02/24/2008 05:34:25 0:30:20 119.9 -5.7 14262.1 23790.0

02/24/2008 05:34:35 0:30:30 67.2 -5.7 7993.4 7993.4

02/24/2008 05:34:45 0:30:40 20.4 -5.7 2426.6 2426.6

02/24/2008 05:34:55 0:30:50 5.2 -5.7 618.5 618.5

02/24/2008 05:35:05 0:31:00 1.3 -5.7 154.6 237.9

02/24/2008 05:35:15 0:31:10 3.8 -5.7 452.0 452.0

02/24/2008 05:35:25 0:31:20 4.3 -5.7 511.5 511.5

02/24/2008 05:35:35 0:31:30 0.8 -5.7 95.2 237.9

02/24/2008 05:35:45 0:31:40 -0.4 -5.7 -47.6 237.9

02/24/2008 05:35:55 0:31:50 -0.7 -5.7 -83.3 237.9

02/24/2008 05:36:05 0:32:00 -0.7 -5.7 -83.3 237.9

02/24/2008 05:36:15 0:32:10 -1.1 -5.7 -130.8 237.9

02/24/2008 05:36:25 0:32:20 -1.4 -5.7 -166.5 237.9

02/24/2008 05:36:35 0:32:30 -1.1 -5.7 -130.8 237.9

02/24/2008 05:36:45 0:32:40 -1.3 -5.7 -154.6 237.9

02/24/2008 05:36:55 0:32:50 -1.4 -5.7 -166.5 237.9

02/24/2008 05:37:05 0:33:00 -1.4 -5.7 -166.5 237.9

02/24/2008 05:37:15 0:33:10 -1.6 -5.7 -190.3 237.9

02/24/2008 05:37:25 0:33:20 -1.6 -5.7 -190.3 237.9

02/24/2008 05:37:35 0:33:30 -1.9 -5.7 -226.0 237.9

02/24/2008 05:37:45 0:33:40 -1.9 -5.7 -226.0 237.9

02/24/2008 05:37:55 0:33:50 -1.9 -5.7 -226.0 237.9

02/24/2008 05:38:05 0:34:00 -1.9 -5.7 -226.0 237.9

02/24/2008 05:38:15 0:34:10 -2.1 -5.7 -249.8 237.9

02/24/2008 05:38:25 0:34:20 -2.1 -5.7 -249.8 237.9

02/24/2008 05:38:35 0:34:30 -2.3 -5.7 -273.6 237.9

02/24/2008 05:38:45 0:34:40 -2.3 -5.7 -273.6 237.9

02/24/2008 05:38:55 0:34:50 -2.3 -5.7 -273.6 237.9

02/24/2008 05:39:05 0:35:00 -2.4 -5.7 -285.5 237.9

02/24/2008 05:39:15 0:35:10 -2.4 -5.7 -285.5 237.9

02/24/2008 05:39:25 0:35:20 -2.6 -5.7 -309.3 237.9

02/24/2008 05:39:35 0:35:30 -2.8 -5.7 -333.1 237.9

02/24/2008 05:39:45 0:35:40 -2.8 -5.7 -333.1 237.9

02/24/2008 05:39:55 0:35:50 -2.8 -5.7 -333.1 237.9

02/24/2008 05:40:05 0:36:00 -2.6 -5.7 -309.3 237.9

02/24/2008 05:40:15 0:36:10 -2.8 -5.7 -333.1 237.9

02/24/2008 05:40:25 0:36:20 -2.9 -5.7 -345.0 237.9

02/24/2008 05:40:35 0:36:30 -2.9 -5.7 -345.0 237.9

02/24/2008 05:40:45 0:36:40 -2.9 -5.7 -345.0 237.9

02/24/2008 05:40:55 0:36:50 -3.1 -5.7 -368.7 237.9

02/24/2008 05:41:05 0:37:00 -3.1 -5.7 -368.7 237.9

02/24/2008 05:41:15 0:37:10 -3.3 -5.7 -392.5 237.9

02/24/2008 05:41:25 0:37:20 -3.3 -5.7 -392.5 237.9

02/24/2008 05:41:35 0:37:30 -3.3 -5.7 -392.5 237.9

02/24/2008 05:41:45 0:37:40 -3.3 -5.7 -392.5 237.9

02/24/2008 05:41:55 0:37:50 -2.8 -5.7 -333.1 237.9

02/24/2008 05:42:05 0:38:00 -2.1 -5.7 -249.8 237.9

02/24/2008 05:42:15 0:38:10 -1.3 -5.7 -154.6 237.9

02/24/2008 05:42:25 0:38:20 -0.7 -5.7 -83.3 237.9

3

 REDACTED
CITGO

Coker Steam Vent Testing

URS Raw THC Data

Run 1

Average Dilution Ratio (High)= 119.0 HIGH - THC1 LOW - THC2

24 Hour Time Elapsed

Time

RAW

(ppmw)

RAW

(ppmw)

RAW x DLR

(ppmw)

Actual

(ppmw)

HIGH THC1

02/24/2008 05:42:35 0:38:30 -0.2 -5.7 -23.8 237.9

02/24/2008 05:42:45 0:38:40 0.3 -5.7 35.7 237.9

02/24/2008 05:42:55 0:38:50 0.6 -5.7 71.4 237.9

02/24/2008 05:43:05 0:39:00 0.8 -5.7 95.2 237.9

02/24/2008 05:43:15 0:39:10 0.6 -5.7 71.4 237.9

02/24/2008 05:43:25 0:39:20 0.6 -5.7 71.4 237.9

02/24/2008 05:43:35 0:39:30 0.6 -5.7 71.4 237.9

02/24/2008 05:43:45 0:39:40 -0.1 -5.7 -11.9 237.9

02/24/2008 05:43:55 0:39:50 -0.2 -5.7 -23.8 237.9

02/24/2008 05:44:05 0:40:00 -0.6 -5.7 -71.4 237.9

02/24/2008 05:44:15 0:40:10 -0.2 -5.7 -23.8 237.9

02/24/2008 05:44:25 0:40:20 2.3 -5.7 273.6 273.6

02/24/2008 05:44:35 0:40:30 2.6 -5.7 309.3 309.3

02/24/2008 05:44:45 0:40:40 2.5 -5.7 297.4 297.4

02/24/2008 05:44:55 0:40:50 3.0 -5.7 356.9 356.9

02/24/2008 05:45:05 0:41:00 4.8 -5.7 571.0 571.0

02/24/2008 05:45:15 0:41:10 7.9 -5.7 939.7 939.7

02/24/2008 05:45:25 0:41:20 13.0 -5.7 1546.4 1546.4

02/24/2008 05:45:35 0:41:30 19.2 -5.7 2283.8 2283.8

02/24/2008 05:45:45 0:41:40 27.7 -5.7 3294.9 3294.9

02/24/2008 05:45:55 0:41:50 35.5 -5.7 4222.7 4222.7

02/24/2008 05:46:05 0:42:00 44.1 -5.7 5245.7 5245.7

02/24/2008 05:46:15 0:42:10 54.8 -5.7 6518.5 6518.5

02/24/2008 05:46:25 0:42:20 60.2 -5.7 7160.8 7160.8

02/24/2008 05:46:35 0:42:30 68.0 -5.7 8088.6 8088.6

02/24/2008 05:46:45 0:42:40 75.8 -5.7 9016.4 9016.4

02/24/2008 05:46:55 0:42:50 81.6 -5.7 9706.3 9706.3

02/24/2008 05:47:05 0:43:00 92.2 -5.7 10967.2 10967.2

02/24/2008 05:47:15 0:43:10 94.4 -5.7 11228.9 11228.9

02/24/2008 05:47:25 0:43:20 92.9 -5.7 11050.5 11050.5

02/24/2008 05:47:35 0:43:30 103.1 -5.7 12263.8 23790.0

02/24/2008 05:47:45 0:43:40 108.3 -5.7 12882.3 23790.0

02/24/2008 05:47:55 0:43:50 106.1 -5.7 12620.6 23790.0

02/24/2008 05:48:05 0:44:00 114.3 -5.7 13596.0 23790.0

02/24/2008 05:48:15 0:44:10 125.1 -5.7 14880.7 23790.0

02/24/2008 05:48:25 0:44:20 130.2 -5.7 15487.3 23790.0

02/24/2008 05:48:35 0:44:30 131.0 -5.7 15582.5 23790.0

02/24/2008 05:48:45 0:44:40 141.4 -5.7 16819.5 23790.0

02/24/2008 05:48:55 0:44:50 147.0 -5.7 17485.7 23790.0

02/24/2008 05:49:05 0:45:00 132.6 -5.7 15772.8 23790.0

02/24/2008 05:49:15 0:45:10 147.5 -5.7 17545.1 23790.0

02/24/2008 05:49:25 0:45:20 140.5 -5.7 16712.5 23790.0

02/24/2008 05:49:35 0:45:30 138.1 -5.7 16427.0 23790.0

02/24/2008 05:49:45 0:45:40 126.5 -5.7 15047.2 23790.0

02/24/2008 05:49:55 0:45:50 128.7 -5.7 15308.9 23790.0

02/24/2008 05:50:05 0:46:00 117.0 -5.7 13917.2 23790.0

02/24/2008 05:50:15 0:46:10 166.4 -5.7 19793.3 23790.0

02/24/2008 05:50:25 0:46:20 224.4 -5.7 26692.4 26692.4

02/24/2008 05:50:35 0:46:30 168.8 -5.7 20078.8 23790.0

02/24/2008 05:50:45 0:46:40 58.4 -5.7 6946.7 6946.7

02/24/2008 05:50:55 0:46:50 17.5 -5.7 2081.6 2081.6

02/24/2008 05:51:05 0:47:00 5.2 -5.7 618.5 618.5

02/24/2008 05:51:15 0:47:10 2.0 -5.7 237.9 237.9

02/24/2008 05:51:25 0:47:20 0.8 -5.7 95.2 237.9

02/24/2008 05:51:35 0:47:30 2.0 -5.7 237.9 237.9

02/24/2008 05:51:45 0:47:40 3.2 -5.7 380.6 380.6

02/24/2008 05:51:55 0:47:50 1.6 -5.7 190.3 237.9

02/24/2008 05:52:05 0:48:00 -0.2 -5.7 -23.8 237.9

02/24/2008 05:52:15 0:48:10 -0.7 -5.7 -83.3 237.9

02/24/2008 05:52:25 0:48:20 -1.3 -5.7 -154.6 237.9

02/24/2008 05:52:35 0:48:30 -1.3 -5.7 -154.6 237.9

02/24/2008 05:52:45 0:48:40 -1.1 -5.7 -130.8 237.9

02/24/2008 05:52:55 0:48:50 -1.4 -5.7 -166.5 237.9

Data Points 294 294 294

Maximum 932.9 110968.6 110968.6

Minimum -5.0 -594.8 237.9

Run 1 Average 48.1 5716.2 6910.4

4

 REDACTED
Citgo

Coker Steam Vent Testing

URS THC Raw Data

Run 2

Average Dilution Ratio (Low) = 116.5 HIGH LOW

24 Hour Time

Elapsed

Time

THC1

(ppmw)

THC2

(ppmw)

Raw

X DLR 

(ppmw)

Actual

(ppmw)

Raw

X DLR 

(ppmw)

Actual

(ppmw)

Dual-Range

(ppmw)

02/26/2008 05:05:02 0:00:00 -0.6 -0.6 -69.9 233.1 -67.8 233.1 233.1

02/26/2008 05:05:12 0:00:10 -0.6 -0.6 -69.9 233.1 -65.1 233.1 233.1

02/26/2008 05:05:22 0:00:20 -0.6 -0.5 -69.9 233.1 -62.5 233.1 233.1

02/26/2008 05:05:32 0:00:30 -0.7 -0.6 -81.6 233.1 -73.6 233.1 233.1

02/26/2008 05:05:42 0:00:40 -0.7 -0.7 -81.6 233.1 -85.4 233.1 233.1

02/26/2008 05:05:52 0:00:50 -0.7 -0.8 -81.6 233.1 -88.1 233.1 233.1

02/26/2008 05:06:02 0:01:00 -0.7 -0.7 -81.6 233.1 -86.0 233.1 233.1

02/26/2008 05:06:12 0:01:10 -0.7 -0.8 -81.6 233.1 -90.8 233.1 233.1

02/26/2008 05:06:22 0:01:20 -0.9 -0.9 -104.9 233.1 -107.8 233.1 233.1

02/26/2008 05:06:32 0:01:30 -1.3 -1.2 -151.5 233.1 -134.5 233.1 233.1

02/26/2008 05:06:42 0:01:40 -1.3 -1.2 -151.5 233.1 -143.6 233.1 233.1

02/26/2008 05:06:52 0:01:50 -1.3 -1.3 -151.5 233.1 -146.2 233.1 233.1

02/26/2008 05:07:02 0:02:00 -1.4 -1.3 -163.1 233.1 -145.7 233.1 233.1

02/26/2008 05:07:12 0:02:10 -1.3 -1.2 -151.5 233.1 -145.2 233.1 233.1

02/26/2008 05:07:22 0:02:20 -1.3 -1.2 -151.5 233.1 -143.6 233.1 233.1

02/26/2008 05:07:32 0:02:30 -1.3 -1.2 -151.5 233.1 -143.6 233.1 233.1

02/26/2008 05:07:42 0:02:40 -1.3 -1.2 -151.5 233.1 -143.1 233.1 233.1

02/26/2008 05:07:52 0:02:50 -1.3 -1.2 -151.5 233.1 -143.1 233.1 233.1

02/26/2008 05:08:02 0:03:00 -1.3 -1.2 -151.5 233.1 -143.1 233.1 233.1

02/26/2008 05:08:12 0:03:10 -1.3 -1.2 -151.5 233.1 -143.1 233.1 233.1

02/26/2008 05:08:22 0:03:20 -1.3 -1.2 -151.5 233.1 -143.1 233.1 233.1

02/26/2008 05:08:32 0:03:30 -1.3 -1.2 -151.5 233.1 -143.1 233.1 233.1

02/26/2008 05:08:42 0:03:40 -1.3 -1.2 -151.5 233.1 -142.5 233.1 233.1

02/26/2008 05:08:52 0:03:50 -1.3 -1.2 -151.5 233.1 -143.1 233.1 233.1

02/26/2008 05:09:02 0:04:00 -1.3 -1.2 -151.5 233.1 -142.5 233.1 233.1

02/26/2008 05:09:12 0:04:10 -1.3 -1.2 -151.5 233.1 -141.9 233.1 233.1

02/26/2008 05:09:22 0:04:20 -1.3 -1.2 -151.5 233.1 -140.9 233.1 233.1

02/26/2008 05:09:32 0:04:30 -1.3 -1.2 -151.5 233.1 -140.9 233.1 233.1

02/26/2008 05:09:42 0:04:40 -1.3 -1.2 -151.5 233.1 -140.4 233.1 233.1

02/26/2008 05:09:52 0:04:50 -1.3 -1.2 -151.5 233.1 -139.8 233.1 233.1

02/26/2008 05:10:02 0:05:00 -1.3 -1.2 -151.5 233.1 -139.4 233.1 233.1

02/26/2008 05:10:12 0:05:10 -1.3 -1.2 -151.5 233.1 -139.4 233.1 233.1

02/26/2008 05:10:22 0:05:20 -1.3 -1.2 -151.5 233.1 -138.2 233.1 233.1

02/26/2008 05:10:32 0:05:30 -1.3 -1.2 -151.5 233.1 -138.2 233.1 233.1

02/26/2008 05:10:42 0:05:40 21.4 17.4 2493.8 2493.8 2026.1 2026.1 2026.1

02/26/2008 05:10:52 0:05:50 94.3 90.2 10989.1 10989.1 10507.0 10507.0 10507.0

02/26/2008 05:11:02 0:06:00 44.3 44.3 5162.4 5162.4 5157.4 5157.4 5157.4

02/26/2008 05:11:12 0:06:10 13.5 13.4 1573.2 1573.2 1560.8 1560.8 1560.8

02/26/2008 05:11:22 0:06:20 4.0 4.0 466.1 466.1 461.4 461.4 461.4

02/26/2008 05:11:32 0:06:30 1.1 1.0 128.2 233.1 115.1 233.1 233.1

02/26/2008 05:11:42 0:06:40 -0.1 -0.1 -11.7 233.1 -9.2 233.1 233.1

02/26/2008 05:11:52 0:06:50 -0.6 -0.6 -69.9 233.1 -66.2 233.1 233.1

02/26/2008 05:12:02 0:07:00 -0.7 -0.8 -81.6 233.1 -89.1 233.1 233.1

02/26/2008 05:12:12 0:07:10 -0.9 -0.9 -104.9 233.1 -103.0 233.1 233.1

02/26/2008 05:12:22 0:07:20 -0.9 -1.0 -104.9 233.1 -113.2 233.1 233.1

02/26/2008 05:12:32 0:07:30 -0.9 -0.9 -104.9 233.1 -110.5 233.1 233.1

02/26/2008 05:12:42 0:07:40 -1.1 -1.0 -128.2 233.1 -115.4 233.1 233.1

02/26/2008 05:12:52 0:07:50 -1.1 -1.0 -128.2 233.1 -122.2 233.1 233.1

02/26/2008 05:13:02 0:08:00 -1.1 -1.1 -128.2 233.1 -126.6 233.1 233.1

02/26/2008 05:13:12 0:08:10 -1.1 -1.1 -128.2 233.1 -126.6 233.1 233.1

02/26/2008 05:13:22 0:08:20 -1.1 -1.1 -128.2 233.1 -131.3 233.1 233.1

02/26/2008 05:13:32 0:08:30 -1.1 -1.1 -128.2 233.1 -128.1 233.1 233.1

02/26/2008 05:13:42 0:08:40 -1.1 -1.1 -128.2 233.1 -129.7 233.1 233.1

02/26/2008 05:13:52 0:08:50 -1.3 -1.2 -151.5 233.1 -137.2 233.1 233.1

02/26/2008 05:14:02 0:09:00 -1.3 -1.2 -151.5 233.1 -139.8 233.1 233.1

02/26/2008 05:14:12 0:09:10 -1.3 -1.2 -151.5 233.1 -138.2 233.1 233.1

02/26/2008 05:14:22 0:09:20 -1.3 -1.2 -151.5 233.1 -139.8 233.1 233.1

02/26/2008 05:14:32 0:09:30 -1.3 -1.2 -151.5 233.1 -141.9 233.1 233.1

02/26/2008 05:14:42 0:09:40 -1.3 -1.2 -151.5 233.1 -143.1 233.1 233.1

02/26/2008 05:14:52 0:09:50 -1.3 -1.3 -151.5 233.1 -147.9 233.1 233.1

02/26/2008 05:15:02 0:10:00 -1.3 -1.3 -151.5 233.1 -150.0 233.1 233.1

02/26/2008 05:15:12 0:10:10 -1.3 -1.3 -151.5 233.1 -148.3 233.1 233.1

02/26/2008 05:15:22 0:10:20 -1.3 -1.3 -151.5 233.1 -147.9 233.1 233.1

02/26/2008 05:15:32 0:10:30 -1.4 -1.3 -163.1 233.1 -151.6 233.1 233.1

02/26/2008 05:15:42 0:10:40 -1.3 -1.3 -151.5 233.1 -151.6 233.1 233.1

02/26/2008 05:15:52 0:10:50 -1.3 -1.2 -151.5 233.1 -144.6 233.1 233.1

02/26/2008 05:16:02 0:11:00 -1.4 -1.3 -163.1 233.1 -153.2 233.1 233.1

02/26/2008 05:16:12 0:11:10 -1.4 -1.3 -163.1 233.1 -155.8 233.1 233.1

02/26/2008 05:16:22 0:11:20 -1.4 -1.3 -163.1 233.1 -157.0 233.1 233.1

02/26/2008 05:16:32 0:11:30 -0.7 -0.9 -81.6 233.1 -105.2 233.1 233.1

02/26/2008 05:16:42 0:11:40 -0.7 -0.7 -81.6 233.1 -77.5 233.1 233.1

02/26/2008 05:16:52 0:11:50 -1.3 -1.2 -151.5 233.1 -140.4 233.1 233.1

02/26/2008 05:17:02 0:12:00 -1.3 -1.3 -151.5 233.1 -146.8 233.1 233.1

02/26/2008 05:17:12 0:12:10 -1.3 -1.2 -151.5 233.1 -141.5 233.1 233.1

02/26/2008 05:17:22 0:12:20 -1.3 -1.2 -151.5 233.1 -143.1 233.1 233.1

02/26/2008 05:17:32 0:12:30 -1.3 -1.2 -151.5 233.1 -140.9 233.1 233.1

02/26/2008 05:17:42 0:12:40 -1.3 -1.2 -151.5 233.1 -140.9 233.1 233.1

02/26/2008 05:17:52 0:12:50 -1.3 -1.2 -151.5 233.1 -138.8 233.1 233.1

02/26/2008 05:18:02 0:13:00 -1.1 -1.2 -128.2 233.1 -139.4 233.1 233.1

02/26/2008 05:18:12 0:13:10 -1.3 -1.2 -151.5 233.1 -140.9 233.1 233.1

02/26/2008 05:18:22 0:13:20 -1.3 -1.2 -151.5 233.1 -144.2 233.1 233.1

02/26/2008 05:18:32 0:13:30 -1.3 -1.2 -151.5 233.1 -141.9 233.1 233.1

HIGH - THC1 LOW - THC2

4

 REDACTED
Citgo

Coker Steam Vent Testing

URS THC Raw Data

Run 2

Average Dilution Ratio (Low) = 116.5 HIGH LOW

24 Hour Time

Elapsed

Time

THC1

(ppmw)

THC2

(ppmw)

Raw

X DLR 

(ppmw)

Actual

(ppmw)

Raw

X DLR 

(ppmw)

Actual

(ppmw)

Dual-Range

(ppmw)

HIGH - THC1 LOW - THC2

02/26/2008 05:18:42 0:13:40 -1.3 -1.2 -151.5 233.1 -142.5 233.1 233.1

02/26/2008 05:18:52 0:13:50 -1.3 -1.3 -151.5 233.1 -145.7 233.1 233.1

02/26/2008 05:19:02 0:14:00 -1.3 -1.2 -151.5 233.1 -143.1 233.1 233.1

02/26/2008 05:19:12 0:14:10 -1.3 -1.2 -151.5 233.1 -143.6 233.1 233.1

02/26/2008 05:19:22 0:14:20 -1.3 -1.2 -151.5 233.1 -144.2 233.1 233.1

02/26/2008 05:19:32 0:14:30 -1.3 -1.2 -151.5 233.1 -139.4 233.1 233.1

02/26/2008 05:19:42 0:14:40 -1.3 -1.2 -151.5 233.1 -140.9 233.1 233.1

02/26/2008 05:19:52 0:14:50 -1.3 -1.2 -151.5 233.1 -141.9 233.1 233.1

02/26/2008 05:20:02 0:15:00 -1.3 -1.2 -151.5 233.1 -138.2 233.1 233.1

02/26/2008 05:20:12 0:15:10 -1.3 -1.2 -151.5 233.1 -139.4 233.1 233.1

02/26/2008 05:20:22 0:15:20 -1.3 -1.1 -151.5 233.1 -129.7 233.1 233.1

02/26/2008 05:20:32 0:15:30 -1.3 -1.1 -151.5 233.1 -123.9 233.1 233.1

02/26/2008 05:20:42 0:15:40 -1.3 -1.1 -151.5 233.1 -122.8 233.1 233.1

02/26/2008 05:20:52 0:15:50 -1.1 -1.0 -128.2 233.1 -115.4 233.1 233.1

02/26/2008 05:21:02 0:16:00 -1.3 -1.1 -151.5 233.1 -129.2 233.1 233.1

02/26/2008 05:21:12 0:16:10 -1.1 -1.1 -128.2 233.1 -133.0 233.1 233.1

02/26/2008 05:21:22 0:16:20 -1.3 -1.2 -151.5 233.1 -137.7 233.1 233.1

02/26/2008 05:21:32 0:16:30 -1.3 -1.2 -151.5 233.1 -141.5 233.1 233.1

02/26/2008 05:21:42 0:16:40 -1.3 -1.2 -151.5 233.1 -145.2 233.1 233.1

02/26/2008 05:21:52 0:16:50 -1.3 -1.3 -151.5 233.1 -147.3 233.1 233.1

02/26/2008 05:22:02 0:17:00 -1.3 -1.3 -151.5 233.1 -149.5 233.1 233.1

02/26/2008 05:22:12 0:17:10 -1.4 -1.3 -163.1 233.1 -148.3 233.1 233.1

02/26/2008 05:22:22 0:17:20 -1.3 -1.3 -151.5 233.1 -150.0 233.1 233.1

02/26/2008 05:22:32 0:17:30 -1.3 -1.3 -151.5 233.1 -150.0 233.1 233.1

02/26/2008 05:22:42 0:17:40 -1.3 -1.3 -151.5 233.1 -150.6 233.1 233.1

02/26/2008 05:22:52 0:17:50 -1.3 -1.3 -151.5 233.1 -147.9 233.1 233.1

02/26/2008 05:23:02 0:18:00 -1.3 -1.3 -151.5 233.1 -146.2 233.1 233.1

02/26/2008 05:23:12 0:18:10 -1.4 -1.3 -163.1 233.1 -148.3 233.1 233.1

02/26/2008 05:23:22 0:18:20 -1.3 -1.3 -151.5 233.1 -148.3 233.1 233.1

02/26/2008 05:23:32 0:18:30 -1.3 -1.2 -151.5 233.1 -144.2 233.1 233.1

02/26/2008 05:23:42 0:18:40 -1.3 -1.2 -151.5 233.1 -143.6 233.1 233.1

02/26/2008 05:23:52 0:18:50 -1.3 -1.2 -151.5 233.1 -144.2 233.1 233.1

02/26/2008 05:24:02 0:19:00 -1.3 -1.2 -151.5 233.1 -141.9 233.1 233.1

02/26/2008 05:24:12 0:19:10 -1.3 -1.2 -151.5 233.1 -143.6 233.1 233.1

02/26/2008 05:24:22 0:19:20 -1.3 -1.2 -151.5 233.1 -145.2 233.1 233.1

02/26/2008 05:24:32 0:19:30 -1.3 -1.2 -151.5 233.1 -144.6 233.1 233.1

02/26/2008 05:24:42 0:19:40 -1.3 -1.3 -151.5 233.1 -146.8 233.1 233.1

02/26/2008 05:24:52 0:19:50 -1.3 -1.3 -151.5 233.1 -145.7 233.1 233.1

02/26/2008 05:25:02 0:20:00 -1.3 -1.3 -151.5 233.1 -147.3 233.1 233.1

02/26/2008 05:25:12 0:20:10 -1.3 -1.3 -151.5 233.1 -150.6 233.1 233.1

02/26/2008 05:25:22 0:20:20 -1.3 -1.3 -151.5 233.1 -151.6 233.1 233.1

02/26/2008 05:25:32 0:20:30 -1.3 -1.3 -151.5 233.1 -152.7 233.1 233.1

02/26/2008 05:25:42 0:20:40 -1.3 -1.3 -151.5 233.1 -154.3 233.1 233.1

02/26/2008 05:25:52 0:20:50 -1.3 -1.3 -151.5 233.1 -147.3 233.1 233.1

02/26/2008 05:26:02 0:21:00 -1.3 -1.3 -151.5 233.1 -145.7 233.1 233.1

02/26/2008 05:26:12 0:21:10 -1.3 -1.3 -151.5 233.1 -148.9 233.1 233.1

02/26/2008 05:26:22 0:21:20 -1.3 -1.3 -151.5 233.1 -151.6 233.1 233.1

02/26/2008 05:26:32 0:21:30 -1.3 -1.3 -151.5 233.1 -149.5 233.1 233.1

02/26/2008 05:26:42 0:21:40 -1.3 -1.2 -151.5 233.1 -137.2 233.1 233.1

02/26/2008 05:26:52 0:21:50 -1.3 -1.2 -151.5 233.1 -134.0 233.1 233.1

02/26/2008 05:27:02 0:22:00 -1.3 -1.2 -151.5 233.1 -139.8 233.1 233.1

02/26/2008 05:27:12 0:22:10 -1.3 -1.2 -151.5 233.1 -144.6 233.1 233.1

02/26/2008 05:27:22 0:22:20 -1.3 -1.3 -151.5 233.1 -146.8 233.1 233.1

02/26/2008 05:27:32 0:22:30 -1.3 -1.2 -151.5 233.1 -145.2 233.1 233.1

02/26/2008 05:27:42 0:22:40 -1.3 -1.3 -151.5 233.1 -147.3 233.1 233.1

02/26/2008 05:27:52 0:22:50 -1.3 -1.3 -151.5 233.1 -150.6 233.1 233.1

02/26/2008 05:28:02 0:23:00 -1.3 -1.3 -151.5 233.1 -153.2 233.1 233.1

02/26/2008 05:28:12 0:23:10 -1.3 -1.3 -151.5 233.1 -153.2 233.1 233.1

02/26/2008 05:28:22 0:23:20 -1.3 -1.3 -151.5 233.1 -150.0 233.1 233.1

02/26/2008 05:28:32 0:23:30 -1.3 -1.2 -151.5 233.1 -143.1 233.1 233.1

02/26/2008 05:28:42 0:23:40 -1.3 -1.2 -151.5 233.1 -139.8 233.1 233.1

02/26/2008 05:28:52 0:23:50 -1.4 -1.3 -163.1 233.1 -147.3 233.1 233.1

02/26/2008 05:29:02 0:24:00 -1.3 -1.3 -151.5 233.1 -150.6 233.1 233.1

02/26/2008 05:29:12 0:24:10 -1.4 -1.2 -163.1 233.1 -141.9 233.1 233.1

02/26/2008 05:29:22 0:24:20 -1.3 -1.2 -151.5 233.1 -138.8 233.1 233.1

02/26/2008 05:29:32 0:24:30 -1.3 -1.2 -151.5 233.1 -140.9 233.1 233.1

02/26/2008 05:29:42 0:24:40 -1.3 -1.2 -151.5 233.1 -140.4 233.1 233.1

02/26/2008 05:29:52 0:24:50 -1.3 -1.2 -151.5 233.1 -141.5 233.1 233.1

02/26/2008 05:30:02 0:25:00 -1.3 -1.2 -151.5 233.1 -142.5 233.1 233.1

02/26/2008 05:30:12 0:25:10 -1.3 -1.2 -151.5 233.1 -144.6 233.1 233.1

02/26/2008 05:30:22 0:25:20 -1.3 -1.3 -151.5 233.1 -147.3 233.1 233.1

02/26/2008 05:30:32 0:25:30 -1.3 -1.3 -151.5 233.1 -150.0 233.1 233.1

02/26/2008 05:30:42 0:25:40 -1.3 -1.3 -151.5 233.1 -153.7 233.1 233.1

02/26/2008 05:30:52 0:25:50 -1.3 -1.3 -151.5 233.1 -155.3 233.1 233.1

02/26/2008 05:31:02 0:26:00 -1.4 -1.4 -163.1 233.1 -158.0 233.1 233.1

02/26/2008 05:31:12 0:26:10 -1.3 -1.3 -151.5 233.1 -147.9 233.1 233.1

02/26/2008 05:31:22 0:26:20 -0.6 -0.8 -69.9 233.1 -95.1 233.1 233.1

02/26/2008 05:31:32 0:26:30 -0.1 -0.3 -11.7 233.1 -34.7 233.1 233.1

02/26/2008 05:31:42 0:26:40 -0.4 -0.4 -46.6 233.1 -44.9 233.1 233.1

02/26/2008 05:31:52 0:26:50 -0.4 -0.4 -46.6 233.1 -43.4 233.1 233.1

02/26/2008 05:32:02 0:27:00 -0.4 -0.4 -46.6 233.1 -47.1 233.1 233.1

02/26/2008 05:32:12 0:27:10 -0.2 -0.3 -23.3 233.1 -34.3 233.1 233.1

4

 REDACTED
Citgo

Coker Steam Vent Testing

URS THC Raw Data

Run 2

Average Dilution Ratio (Low) = 116.5 HIGH LOW

24 Hour Time

Elapsed

Time

THC1

(ppmw)

THC2

(ppmw)

Raw

X DLR 

(ppmw)

Actual

(ppmw)

Raw

X DLR 

(ppmw)

Actual

(ppmw)

Dual-Range

(ppmw)

HIGH - THC1 LOW - THC2

02/26/2008 05:32:22 0:27:20 -0.7 -0.7 -81.6 233.1 -79.6 233.1 233.1

02/26/2008 05:32:32 0:27:30 -0.9 -0.2 -104.9 233.1 -28.9 233.1 233.1

02/26/2008 05:32:42 0:27:40 -0.9 -0.3 -104.9 233.1 -38.0 233.1 233.1

02/26/2008 05:32:52 0:27:50 -0.9 -0.6 -104.9 233.1 -73.2 233.1 233.1

02/26/2008 05:33:02 0:28:00 -0.9 -0.9 -104.9 233.1 -100.3 233.1 233.1

02/26/2008 05:33:12 0:28:10 -0.9 -1.0 -104.9 233.1 -115.8 233.1 233.1

02/26/2008 05:33:22 0:28:20 -1.1 -1.1 -128.2 233.1 -126.6 233.1 233.1

02/26/2008 05:33:32 0:28:30 -1.1 -1.1 -128.2 233.1 -128.7 233.1 233.1

02/26/2008 05:33:42 0:28:40 -1.1 -1.2 -128.2 233.1 -134.5 233.1 233.1

02/26/2008 05:33:52 0:28:50 -1.1 -1.2 -128.2 233.1 -140.4 233.1 233.1

02/26/2008 05:34:02 0:29:00 -1.1 -1.2 -128.2 233.1 -143.1 233.1 233.1

02/26/2008 05:34:12 0:29:10 -1.3 -1.2 -151.5 233.1 -140.4 233.1 233.1

02/26/2008 05:34:22 0:29:20 -1.3 -1.2 -151.5 233.1 -139.8 233.1 233.1

02/26/2008 05:34:32 0:29:30 -1.3 -1.2 -151.5 233.1 -143.1 233.1 233.1

02/26/2008 05:34:42 0:29:40 -1.3 -1.2 -151.5 233.1 -145.2 233.1 233.1

02/26/2008 05:34:52 0:29:50 -1.3 -1.3 -151.5 233.1 -145.7 233.1 233.1

02/26/2008 05:35:02 0:30:00 -1.3 -1.3 -151.5 233.1 -147.9 233.1 233.1

02/26/2008 05:35:12 0:30:10 -1.3 -1.3 -151.5 233.1 -148.3 233.1 233.1

02/26/2008 05:35:22 0:30:20 -1.3 -1.3 -151.5 233.1 -150.0 233.1 233.1

02/26/2008 05:35:32 0:30:30 -1.3 -1.3 -151.5 233.1 -151.6 233.1 233.1

02/26/2008 05:35:42 0:30:40 -1.3 -1.3 -151.5 233.1 -153.2 233.1 233.1

02/26/2008 05:35:52 0:30:50 -1.3 -1.3 -151.5 233.1 -152.1 233.1 233.1

02/26/2008 05:36:02 0:31:00 -1.3 -1.3 -151.5 233.1 -153.7 233.1 233.1

02/26/2008 05:36:12 0:31:10 -1.3 -1.3 -151.5 233.1 -153.7 233.1 233.1

02/26/2008 05:36:22 0:31:20 -1.4 -1.3 -163.1 233.1 -155.8 233.1 233.1

02/26/2008 05:36:32 0:31:30 -1.4 -1.3 -163.1 233.1 -154.8 233.1 233.1

02/26/2008 05:36:42 0:31:40 -1.4 -1.3 -163.1 233.1 -155.8 233.1 233.1

02/26/2008 05:36:52 0:31:50 -1.3 -1.3 -151.5 233.1 -146.8 233.1 233.1

02/26/2008 05:37:02 0:32:00 -1.3 -1.3 -151.5 233.1 -152.1 233.1 233.1

02/26/2008 05:37:12 0:32:10 -1.3 -1.3 -151.5 233.1 -152.7 233.1 233.1

02/26/2008 05:37:22 0:32:20 -1.3 -1.3 -151.5 233.1 -154.3 233.1 233.1

02/26/2008 05:37:32 0:32:30 -1.4 -1.3 -163.1 233.1 -154.8 233.1 233.1

02/26/2008 05:37:42 0:32:40 -1.3 -1.3 -151.5 233.1 -155.3 233.1 233.1

02/26/2008 05:37:52 0:32:50 -1.4 -1.3 -163.1 233.1 -153.7 233.1 233.1

02/26/2008 05:38:02 0:33:00 -1.3 -1.3 -151.5 233.1 -155.8 233.1 233.1

02/26/2008 05:38:12 0:33:10 -1.4 -1.3 -163.1 233.1 -155.8 233.1 233.1

02/26/2008 05:38:22 0:33:20 -1.4 -1.3 -163.1 233.1 -154.8 233.1 233.1

02/26/2008 05:38:32 0:33:30 -1.3 -1.3 -151.5 233.1 -145.7 233.1 233.1

02/26/2008 05:38:42 0:33:40 -1.3 -1.3 -151.5 233.1 -148.9 233.1 233.1

02/26/2008 05:38:52 0:33:50 -1.3 -1.3 -151.5 233.1 -151.0 233.1 233.1

02/26/2008 05:39:02 0:34:00 -1.3 -1.3 -151.5 233.1 -153.2 233.1 233.1

02/26/2008 05:39:12 0:34:10 -1.3 -1.3 -151.5 233.1 -151.6 233.1 233.1

02/26/2008 05:39:22 0:34:20 -1.3 -1.3 -151.5 233.1 -148.9 233.1 233.1

02/26/2008 05:39:32 0:34:30 -1.3 -1.3 -151.5 233.1 -147.9 233.1 233.1

02/26/2008 05:39:42 0:34:40 -1.4 -1.3 -163.1 233.1 -151.6 233.1 233.1

02/26/2008 05:39:52 0:34:50 -1.3 -1.3 -151.5 233.1 -152.1 233.1 233.1

02/26/2008 05:40:02 0:35:00 -1.3 -1.3 -151.5 233.1 -154.8 233.1 233.1

02/26/2008 05:40:12 0:35:10 -1.3 -1.3 -151.5 233.1 -155.3 233.1 233.1

02/26/2008 05:40:22 0:35:20 -1.4 -1.3 -163.1 233.1 -156.4 233.1 233.1

02/26/2008 05:40:32 0:35:30 -1.4 -1.3 -163.1 233.1 -155.3 233.1 233.1

02/26/2008 05:40:42 0:35:40 -1.3 -1.3 -151.5 233.1 -157.0 233.1 233.1

02/26/2008 05:40:52 0:35:50 -1.4 -1.3 -163.1 233.1 -150.0 233.1 233.1

02/26/2008 05:41:02 0:36:00 -1.3 -1.3 -151.5 233.1 -148.9 233.1 233.1

02/26/2008 05:41:12 0:36:10 0.8 0.2 93.2 233.1 22.8 233.1 233.1

02/26/2008 05:41:22 0:36:20 50.6 45.1 5896.6 5896.6 5257.8 5257.8 5257.8

02/26/2008 05:41:32 0:36:30 133.1 182.9 15510.6 23306.7 21319.6 -1.0 23306.7

02/26/2008 05:41:42 0:36:40 195.1 275.0 22735.7 23306.7 32046.7 -1.0 23306.7

02/26/2008 05:41:52 0:36:50 279.7 275.0 32594.4 32594.4 32046.7 -1.0 32594.4

02/26/2008 05:42:02 0:37:00 410.7 275.0 47860.3 47860.3 32046.7 -1.0 47860.3

02/26/2008 05:42:12 0:37:10 564.5 275.0 65783.1 65783.1 32046.7 -1.0 65783.1

02/26/2008 05:42:22 0:37:20 702.9 275.0 81911.4 81911.4 32046.7 -1.0 81911.4

02/26/2008 05:42:32 0:37:30 919.5 275.0 107152.5 107152.5 32046.7 -1.0 107152.5

02/26/2008 05:42:42 0:37:40 860.0 275.0 100218.8 100218.8 32046.7 -1.0 100218.8

02/26/2008 05:42:52 0:37:50 295.5 244.2 34435.6 34435.6 28454.0 -1.0 34435.6

02/26/2008 05:43:02 0:38:00 133.7 171.7 15580.5 23306.7 20003.6 -1.0 23306.7

02/26/2008 05:43:12 0:38:10 52.6 56.8 6129.7 6129.7 6616.0 6616.0 6616.0

02/26/2008 05:43:22 0:38:20 33.3 32.2 3880.6 3880.6 3757.6 3757.6 3757.6

02/26/2008 05:43:32 0:38:30 27.9 26.0 3251.3 3251.3 3031.0 3031.0 3031.0

02/26/2008 05:43:42 0:38:40 20.3 20.7 2365.6 2365.6 2407.5 2407.5 2407.5

02/26/2008 05:43:52 0:38:50 15.3 15.2 1783.0 1783.0 1771.0 1771.0 1771.0

02/26/2008 05:44:02 0:39:00 17.0 15.6 1981.1 1981.1 1820.1 1820.1 1820.1

02/26/2008 05:44:12 0:39:10 12.8 12.9 1491.6 1491.6 1502.1 1502.1 1502.1

02/26/2008 05:44:22 0:39:20 18.4 16.9 2144.2 2144.2 1967.3 1967.3 1967.3

02/26/2008 05:44:32 0:39:30 16.9 15.7 1969.4 1969.4 1824.3 1824.3 1824.3

02/26/2008 05:44:42 0:39:40 17.0 16.9 1981.1 1981.1 1966.7 1966.7 1966.7

02/26/2008 05:44:52 0:39:50 6.4 6.1 745.8 745.8 712.1 712.1 712.1

02/26/2008 05:45:02 0:40:00 1.3 1.3 151.5 233.1 147.6 233.1 233.1

02/26/2008 05:45:12 0:40:10 0.8 0.6 93.2 233.1 70.9 233.1 233.1

02/26/2008 05:45:22 0:40:20 0.8 0.6 93.2 233.1 70.9 233.1 233.1

02/26/2008 05:45:32 0:40:30 0.9 0.8 104.9 233.1 88.4 233.1 233.1

02/26/2008 05:45:42 0:40:40 1.3 1.1 151.5 233.1 127.4 233.1 233.1

02/26/2008 05:45:52 0:40:50 56.0 65.5 6525.9 6525.9 7637.5 7637.5 7637.5

4

 REDACTED
Citgo

Coker Steam Vent Testing

URS THC Raw Data

Run 2

Average Dilution Ratio (Low) = 116.5 HIGH LOW

24 Hour Time

Elapsed

Time

THC1

(ppmw)

THC2

(ppmw)

Raw

X DLR 

(ppmw)

Actual

(ppmw)

Raw

X DLR 

(ppmw)

Actual

(ppmw)

Dual-Range

(ppmw)

HIGH - THC1 LOW - THC2

02/26/2008 05:46:02 0:41:00 5.9 6.0 687.5 687.5 697.7 697.7 697.7

02/26/2008 05:46:12 0:41:10 3.0 2.7 349.6 349.6 313.0 313.0 313.0

02/26/2008 05:46:22 0:41:20 4.0 3.7 466.1 466.1 428.3 428.3 428.3

02/26/2008 05:46:32 0:41:30 6.2 5.7 722.5 722.5 663.5 663.5 663.5

02/26/2008 05:46:42 0:41:40 8.6 8.1 1002.2 1002.2 941.5 941.5 941.5

02/26/2008 05:46:52 0:41:50 10.9 10.1 1270.2 1270.2 1171.4 1171.4 1171.4

02/26/2008 05:47:02 0:42:00 30.9 28.8 3600.9 3600.9 3360.2 3360.2 3360.2

02/26/2008 05:47:12 0:42:10 15.7 15.2 1829.6 1829.6 1773.6 1773.6 1773.6

02/26/2008 05:47:22 0:42:20 4.2 4.3 489.4 489.4 499.8 499.8 499.8

02/26/2008 05:47:32 0:42:30 3.5 3.2 407.9 407.9 367.4 367.4 367.4

02/26/2008 05:47:42 0:42:40 3.8 3.7 442.8 442.8 425.6 425.6 425.6

02/26/2008 05:47:52 0:42:50 4.5 4.1 524.4 524.4 473.6 473.6 473.6

02/26/2008 05:48:02 0:43:00 4.8 4.6 559.4 559.4 540.8 540.8 540.8

02/26/2008 05:48:12 0:43:10 3.8 3.5 442.8 442.8 408.0 408.0 408.0

02/26/2008 05:48:22 0:43:20 2.1 2.1 244.7 244.7 240.5 240.5 240.5

02/26/2008 05:48:32 0:43:30 -0.6 -0.5 -69.9 233.1 -56.6 233.1 233.1

02/26/2008 05:48:42 0:43:40 -0.9 -0.8 -104.9 233.1 -91.8 233.1 233.1

02/26/2008 05:48:52 0:43:50 -0.9 -0.9 -104.9 233.1 -99.3 233.1 233.1

02/26/2008 05:49:02 0:44:00 -0.9 -0.9 -104.9 233.1 -100.3 233.1 233.1

02/26/2008 05:49:12 0:44:10 -0.9 -0.7 -104.9 233.1 -82.3 233.1 233.1

02/26/2008 05:49:22 0:44:20 -0.7 -0.6 -81.6 233.1 -73.6 233.1 233.1

02/26/2008 05:49:32 0:44:30 -0.6 -0.5 -69.9 233.1 -55.0 233.1 233.1

02/26/2008 05:49:42 0:44:40 -0.1 0.0 -11.7 233.1 -0.1 233.1 233.1

02/26/2008 05:49:52 0:44:50 -0.1 0.2 -11.7 233.1 21.2 233.1 233.1

02/26/2008 05:50:02 0:45:00 0.1 0.3 11.7 233.1 38.8 233.1 233.1

02/26/2008 05:50:12 0:45:10 1.5 1.5 174.8 233.1 172.7 233.1 233.1

02/26/2008 05:50:22 0:45:20 0.8 0.8 93.2 233.1 87.4 233.1 233.1

02/26/2008 05:50:32 0:45:30 1.5 1.3 174.8 233.1 156.3 233.1 233.1

02/26/2008 05:50:42 0:45:40 1.6 1.2 186.5 233.1 134.4 233.1 233.1

02/26/2008 05:50:52 0:45:50 59.2 59.9 6898.8 6898.8 6979.8 6979.8 6979.8

Data Points 276.0 276.0 276.0

Maximum 919.5 275.0 107152.5

Minimum -1.4 -1.4 233.1

Average 17.9 10.7 2439.2

4

 REDACTED
CITGO

Coker Steam Vent Testing

URS THC Raw Data

Run 3

Average Dilution Ratio (Low) = 111.4 HIGH LOW

24 Hour Time

Elapsed

Time

THC1

(ppmw)

THC2

(ppmw)

Raw

X DLR 

(ppmw)

Actual

(ppmw)

Raw

X DLR 

(ppmw)

Actual

(ppmw)

Dual-Range

(ppmw)

02/27/2008 19:36:08 0:00:00 17.0 17.2 1894.3 1894.3 1915.4 1915.4 1915.4

02/27/2008 19:36:18 0:00:10 18.6 19.1 2072.6 2072.6 2124.6 2124.6 2124.6

02/27/2008 19:36:28 0:00:20 18.1 18.4 2016.9 2016.9 2050.6 2050.6 2050.6

02/27/2008 19:36:38 0:00:30 17.2 17.6 1916.6 1916.6 1961.3 1961.3 1961.3

02/27/2008 19:36:48 0:00:40 14.7 15.1 1638.0 1638.0 1683.3 1683.3 1683.3

02/27/2008 19:36:58 0:00:50 12.3 12.4 1370.6 1370.6 1386.9 1386.9 1386.9

02/27/2008 19:37:08 0:01:00 11.5 11.5 1281.5 1281.5 1286.4 1286.4 1286.4

02/27/2008 19:37:18 0:01:10 10.9 11.1 1214.6 1214.6 1239.0 1239.0 1239.0

02/27/2008 19:37:28 0:01:20 12.1 12.2 1348.3 1348.3 1358.4 1358.4 1358.4

02/27/2008 19:37:38 0:01:30 13.0 13.1 1448.6 1448.6 1458.3 1458.3 1458.3

02/27/2008 19:37:48 0:01:40 14.2 14.2 1582.3 1582.3 1579.8 1579.8 1579.8

02/27/2008 19:37:58 0:01:50 363.9 189.6 40550.0 40550.0 21132.5 -1.0 40550.0

02/27/2008 19:38:08 0:02:00 1629.2 275.0 181544.4 181544.4 30643.7 -1.0 181544.4

02/27/2008 19:38:18 0:02:10 2483.3 275.0 276718.2 276718.2 30643.7 -1.0 276718.2

02/27/2008 19:38:28 0:02:20 2758.6 275.0 307395.3 307395.3 30643.7 -1.0 307395.3

02/27/2008 19:38:38 0:02:30 2836.0 275.0 316020.1 316020.1 30643.7 -1.0 316020.1

02/27/2008 19:38:48 0:02:40 2859.7 275.0 318661.0 318661.0 30643.7 -1.0 318661.0

02/27/2008 19:38:58 0:02:50 2847.7 275.0 317323.9 317323.9 30643.7 -1.0 317323.9

02/27/2008 19:39:08 0:03:00 2865.0 275.0 319251.6 319251.6 30643.7 -1.0 319251.6

02/27/2008 19:39:18 0:03:10 2841.4 275.0 316621.8 316621.8 30643.7 -1.0 316621.8

02/27/2008 19:39:28 0:03:20 2859.7 275.0 318661.0 318661.0 30643.7 -1.0 318661.0

02/27/2008 19:39:38 0:03:30 2818.0 275.0 314014.3 314014.3 30643.7 -1.0 314014.3

02/27/2008 19:39:48 0:03:40 2843.4 275.0 316844.7 316844.7 30643.7 -1.0 316844.7

02/27/2008 19:39:58 0:03:50 2811.8 275.0 313323.5 313323.5 30643.7 -1.0 313323.5

02/27/2008 19:40:08 0:04:00 2818.5 275.0 314070.1 314070.1 30643.7 -1.0 314070.1

02/27/2008 19:40:18 0:04:10 2804.3 275.0 312487.7 312487.7 30643.7 -1.0 312487.7

02/27/2008 19:40:28 0:04:20 2789.4 275.0 310827.4 310827.4 30643.7 -1.0 310827.4

02/27/2008 19:40:38 0:04:30 2809.1 275.0 313022.6 313022.6 30643.7 -1.0 313022.6

02/27/2008 19:40:48 0:04:40 2586.0 275.0 288162.2 288162.2 30643.7 -1.0 288162.2

02/27/2008 19:40:58 0:04:50 2924.1 275.0 325837.2 325837.2 30643.7 -1.0 325837.2

02/27/2008 19:41:08 0:05:00 2839.4 275.0 316399.0 316399.0 30643.7 -1.0 316399.0

02/27/2008 19:41:18 0:05:10 2773.8 275.0 309089.1 309089.1 30643.7 -1.0 309089.1

02/27/2008 19:41:28 0:05:20 2783.1 275.0 310125.4 310125.4 30643.7 -1.0 310125.4

02/27/2008 19:41:38 0:05:30 2760.6 275.0 307618.2 307618.2 30643.7 -1.0 307618.2

02/27/2008 19:41:48 0:05:40 2780.4 275.0 309824.5 309824.5 30643.7 -1.0 309824.5

02/27/2008 19:41:58 0:05:50 2739.8 275.0 305300.4 305300.4 30643.7 -1.0 305300.4

02/27/2008 19:42:08 0:06:00 2698.8 275.0 300731.7 300731.7 30643.7 -1.0 300731.7

02/27/2008 19:42:18 0:06:10 2691.9 275.0 299962.8 299962.8 30643.7 -1.0 299962.8

02/27/2008 19:42:28 0:06:20 2700.5 275.0 300921.1 300921.1 30643.7 -1.0 300921.1

02/27/2008 19:42:38 0:06:30 2733.5 275.0 304598.4 304598.4 30643.7 -1.0 304598.4

02/27/2008 19:42:48 0:06:40 2765.0 275.0 308108.5 308108.5 30643.7 -1.0 308108.5

02/27/2008 19:42:58 0:06:50 2770.3 275.0 308699.0 308699.0 30643.7 -1.0 308699.0

02/27/2008 19:43:08 0:07:00 2750.8 275.0 306526.1 306526.1 30643.7 -1.0 306526.1

02/27/2008 19:43:18 0:07:10 2776.4 275.0 309378.8 309378.8 30643.7 -1.0 309378.8

02/27/2008 19:43:28 0:07:20 2760.8 275.0 307640.4 307640.4 30643.7 -1.0 307640.4

02/27/2008 19:43:38 0:07:30 2787.4 275.0 310604.5 310604.5 30643.7 -1.0 310604.5

02/27/2008 19:43:48 0:07:40 2748.1 275.0 306225.3 306225.3 30643.7 -1.0 306225.3

02/27/2008 19:43:58 0:07:50 2769.4 275.0 308598.8 308598.8 30643.7 -1.0 308598.8

02/27/2008 19:44:08 0:08:00 2692.5 275.0 300029.7 300029.7 30643.7 -1.0 300029.7

02/27/2008 19:44:18 0:08:10 2307.9 275.0 257173.1 257173.1 30643.7 -1.0 257173.1

02/27/2008 19:44:28 0:08:20 1986.2 275.0 221325.5 221325.5 30643.7 -1.0 221325.5

02/27/2008 19:44:38 0:08:30 1807.0 275.0 201357.0 201357.0 30643.7 -1.0 201357.0

02/27/2008 19:44:48 0:08:40 1714.7 275.0 191071.8 191071.8 30643.7 -1.0 191071.8

02/27/2008 19:44:58 0:08:50 1665.3 275.0 185567.1 185567.1 30643.7 -1.0 185567.1

02/27/2008 19:45:08 0:09:00 1645.6 275.0 183371.9 183371.9 30643.7 -1.0 183371.9

02/27/2008 19:45:18 0:09:10 1672.2 275.0 186336.0 186336.0 30643.7 -1.0 186336.0

02/27/2008 19:45:28 0:09:20 1671.9 275.0 186302.5 186302.5 30643.7 -1.0 186302.5

02/27/2008 19:45:38 0:09:30 1749.4 275.0 194938.5 194938.5 30643.7 -1.0 194938.5

02/27/2008 19:45:48 0:09:40 1634.6 275.0 182146.1 182146.1 30643.7 -1.0 182146.1

02/27/2008 19:45:58 0:09:50 810.7 275.0 90337.6 90337.6 30643.7 -1.0 90337.6

02/27/2008 19:46:08 0:10:00 283.0 275.0 31535.2 31535.2 30643.7 -1.0 31535.2

02/27/2008 19:46:18 0:10:10 146.4 224.7 16313.6 22286.3 25039.4 -1.0 22286.3

02/27/2008 19:46:28 0:10:20 93.1 142.8 10374.3 10374.3 15916.2 -1.0 10374.3

02/27/2008 19:46:38 0:10:30 85.1 127.4 9482.8 9482.8 14194.2 -1.0 9482.8

02/27/2008 19:46:48 0:10:40 64.6 69.5 7198.5 7198.5 7739.8 7739.8 7739.8

02/27/2008 19:46:58 0:10:50 60.9 65.5 6786.2 6786.2 7302.1 7302.1 7302.1

02/27/2008 19:47:08 0:11:00 57.0 60.7 6351.6 6351.6 6760.9 6760.9 6760.9

02/27/2008 19:47:18 0:11:10 60.1 63.8 6697.0 6697.0 7111.3 7111.3 7111.3

02/27/2008 19:47:28 0:11:20 35.2 38.2 3922.4 3922.4 4255.2 4255.2 4255.2

02/27/2008 19:47:38 0:11:30 38.6 40.8 4301.3 4301.3 4542.0 4542.0 4542.0

02/27/2008 19:47:48 0:11:40 53.5 55.9 5961.6 5961.6 6233.9 6233.9 6233.9

02/27/2008 19:47:58 0:11:50 52.1 55.2 5805.6 5805.6 6146.7 6146.7 6146.7

02/27/2008 19:48:08 0:12:00 55.0 57.2 6128.7 6128.7 6371.7 6371.7 6371.7

02/27/2008 19:48:18 0:12:10 51.8 54.8 5772.2 5772.2 6109.0 6109.0 6109.0

02/27/2008 19:48:28 0:12:20 44.3 46.4 4936.4 4936.4 5169.3 5169.3 5169.3

02/27/2008 19:48:38 0:12:30 46.3 48.8 5159.3 5159.3 5435.1 5435.1 5435.1

02/27/2008 19:48:48 0:12:40 45.8 47.7 5103.6 5103.6 5312.7 5312.7 5312.7

02/27/2008 19:48:58 0:12:50 44.5 46.9 4958.7 4958.7 5229.6 5229.6 5229.6

02/27/2008 19:49:08 0:13:00 8.9 10.5 991.7 991.7 1169.1 1169.1 1169.1

02/27/2008 19:49:18 0:13:10 2.8 3.6 312.0 312.0 399.4 399.4 399.4

02/27/2008 19:49:28 0:13:20 15.3 15.9 1704.9 1704.9 1767.4 1767.4 1767.4

02/27/2008 19:49:38 0:13:30 32.6 34.0 3632.7 3632.7 3788.0 3788.0 3788.0

HIGH - THC1 LOW - THC2

4

 REDACTED
CITGO

Coker Steam Vent Testing

URS THC Raw Data

Run 3

Average Dilution Ratio (Low) = 111.4 HIGH LOW

24 Hour Time

Elapsed

Time

THC1

(ppmw)

THC2

(ppmw)

Raw

X DLR 

(ppmw)

Actual

(ppmw)

Raw

X DLR 

(ppmw)

Actual

(ppmw)

Dual-Range

(ppmw)

HIGH - THC1 LOW - THC2

02/27/2008 19:49:48 0:13:40 34.1 35.2 3799.8 3799.8 3920.1 3920.1 3920.1

02/27/2008 19:49:58 0:13:50 33.3 34.9 3710.7 3710.7 3886.4 3886.4 3886.4

02/27/2008 19:50:08 0:14:00 24.7 25.3 2752.4 2752.4 2817.8 2817.8 2817.8

02/27/2008 19:50:18 0:14:10 33.1 34.4 3688.4 3688.4 3837.5 3837.5 3837.5

02/27/2008 19:50:28 0:14:20 31.4 32.0 3499.0 3499.0 3569.2 3569.2 3569.2

02/27/2008 19:50:38 0:14:30 42.8 43.7 4769.3 4769.3 4868.4 4868.4 4868.4

02/27/2008 19:50:48 0:14:40 37.9 39.0 4223.3 4223.3 4345.1 4345.1 4345.1

02/27/2008 19:50:58 0:14:50 62.3 63.2 6942.2 6942.2 7041.5 7041.5 7041.5

02/27/2008 19:51:08 0:15:00 48.0 51.0 5348.7 5348.7 5687.6 5687.6 5687.6

02/27/2008 19:51:18 0:15:10 66.5 82.8 7410.2 7410.2 9225.8 9225.8 9225.8

02/27/2008 19:51:28 0:15:20 58.4 73.5 6507.6 6507.6 8186.7 8186.7 8186.7

02/27/2008 19:51:38 0:15:30 27.5 28.6 3064.4 3064.4 3185.1 3185.1 3185.1

02/27/2008 19:51:48 0:15:40 30.9 32.4 3443.2 3443.2 3608.4 3608.4 3608.4

02/27/2008 19:51:58 0:15:50 25.3 26.5 2819.2 2819.2 2954.9 2954.9 2954.9

02/27/2008 19:52:08 0:16:00 27.9 28.5 3108.9 3108.9 3175.4 3175.4 3175.4

02/27/2008 19:52:18 0:16:10 30.6 31.7 3409.8 3409.8 3535.9 3535.9 3535.9

02/27/2008 19:52:28 0:16:20 9.6 10.0 1069.7 1069.7 1117.5 1117.5 1117.5

02/27/2008 19:52:38 0:16:30 24.0 24.5 2674.4 2674.4 2728.5 2728.5 2728.5

02/27/2008 19:52:48 0:16:40 18.7 19.0 2083.8 2083.8 2111.7 2111.7 2111.7

02/27/2008 19:52:58 0:16:50 24.0 24.3 2674.4 2674.4 2708.1 2708.1 2708.1

02/27/2008 19:53:08 0:17:00 20.8 21.1 2317.8 2317.8 2352.5 2352.5 2352.5

02/27/2008 19:53:18 0:17:10 25.3 25.3 2819.2 2819.2 2823.9 2823.9 2823.9

02/27/2008 19:53:28 0:17:20 24.2 25.1 2696.6 2696.6 2793.8 2793.8 2793.8

02/27/2008 19:53:38 0:17:30 23.0 23.2 2562.9 2562.9 2587.2 2587.2 2587.2

02/27/2008 19:53:48 0:17:40 26.0 26.8 2897.2 2897.2 2986.6 2986.6 2986.6

02/27/2008 19:53:58 0:17:50 19.2 20.3 2139.5 2139.5 2260.7 2260.7 2260.7

02/27/2008 19:54:08 0:18:00 25.8 26.5 2874.9 2874.9 2958.1 2958.1 2958.1

02/27/2008 19:54:18 0:18:10 21.6 22.4 2406.9 2406.9 2491.3 2491.3 2491.3

02/27/2008 19:54:28 0:18:20 22.5 22.7 2507.2 2507.2 2525.9 2525.9 2525.9

02/27/2008 19:54:38 0:18:30 20.8 21.4 2317.8 2317.8 2386.2 2386.2 2386.2

02/27/2008 19:54:48 0:18:40 20.4 20.8 2273.2 2273.2 2321.9 2321.9 2321.9

02/27/2008 19:54:58 0:18:50 23.6 24.1 2629.8 2629.8 2682.6 2682.6 2682.6

02/27/2008 19:55:08 0:19:00 18.7 18.8 2083.8 2083.8 2094.9 2094.9 2094.9

02/27/2008 19:55:18 0:19:10 23.5 23.7 2618.6 2618.6 2643.3 2643.3 2643.3

02/27/2008 19:55:28 0:19:20 22.0 22.8 2451.5 2451.5 2545.3 2545.3 2545.3

02/27/2008 19:55:38 0:19:30 18.6 19.4 2072.6 2072.6 2158.7 2158.7 2158.7

02/27/2008 19:55:48 0:19:40 23.5 24.0 2618.6 2618.6 2672.9 2672.9 2672.9

02/27/2008 19:55:58 0:19:50 22.5 23.4 2507.2 2507.2 2606.1 2606.1 2606.1

02/27/2008 19:56:08 0:20:00 19.9 19.8 2217.5 2217.5 2201.6 2201.6 2201.6

02/27/2008 19:56:18 0:20:10 22.6 22.6 2518.4 2518.4 2517.4 2517.4 2517.4

02/27/2008 19:56:28 0:20:20 20.6 21.2 2295.5 2295.5 2365.8 2365.8 2365.8

02/27/2008 19:56:38 0:20:30 18.6 19.2 2072.6 2072.6 2143.9 2143.9 2143.9

02/27/2008 19:56:48 0:20:40 22.3 23.0 2484.9 2484.9 2563.3 2563.3 2563.3

02/27/2008 19:56:58 0:20:50 17.0 17.6 1894.3 1894.3 1961.8 1961.8 1961.8

02/27/2008 19:57:08 0:21:00 16.7 16.5 1860.9 1860.9 1834.7 1834.7 1834.7

02/27/2008 19:57:18 0:21:10 20.3 20.3 2262.1 2262.1 2262.3 2262.3 2262.3

02/27/2008 19:57:28 0:21:20 17.4 17.6 1938.9 1938.9 1961.3 1961.3 1961.3

02/27/2008 19:57:38 0:21:30 15.2 15.7 1693.8 1693.8 1747.0 1747.0 1747.0

02/27/2008 19:57:48 0:21:40 17.4 17.8 1938.9 1938.9 1984.7 1984.7 1984.7

02/27/2008 19:57:58 0:21:50 14.0 14.4 1560.0 1560.0 1607.7 1607.7 1607.7

02/27/2008 19:58:08 0:22:00 13.5 13.2 1504.3 1504.3 1468.0 1468.0 1468.0

02/27/2008 19:58:18 0:22:10 17.5 17.4 1950.1 1950.1 1938.4 1938.4 1938.4

02/27/2008 19:58:28 0:22:20 14.8 15.4 1649.2 1649.2 1719.9 1719.9 1719.9

02/27/2008 19:58:38 0:22:30 11.6 12.1 1292.6 1292.6 1353.2 1353.2 1353.2

02/27/2008 19:58:48 0:22:40 12.8 13.0 1426.3 1426.3 1447.1 1447.1 1447.1

02/27/2008 19:58:58 0:22:50 14.8 15.0 1649.2 1649.2 1668.5 1668.5 1668.5

02/27/2008 19:59:08 0:23:00 12.8 12.5 1426.3 1426.3 1395.0 1395.0 1395.0

02/27/2008 19:59:18 0:23:10 19.2 19.0 2139.5 2139.5 2115.3 2115.3 2115.3

02/27/2008 19:59:28 0:23:20 108.0 135.7 12034.6 22286.3 15123.1 -1.0 22286.3

02/27/2008 19:59:38 0:23:30 342.6 275.0 38176.5 38176.5 30643.7 -1.0 38176.5

02/27/2008 19:59:48 0:23:40 585.1 275.0 65198.6 65198.6 30643.7 -1.0 65198.6

02/27/2008 19:59:58 0:23:50 748.9 275.0 83451.1 83451.1 30643.7 -1.0 83451.1

02/27/2008 20:00:08 0:24:00 801.3 275.0 89290.2 89290.2 30643.7 -1.0 89290.2

02/27/2008 20:00:18 0:24:10 842.1 275.0 93836.6 93836.6 30643.7 -1.0 93836.6

02/27/2008 20:00:28 0:24:20 888.8 275.0 99040.4 99040.4 30643.7 -1.0 99040.4

02/27/2008 20:00:38 0:24:30 885.3 275.0 98650.4 98650.4 30643.7 -1.0 98650.4

02/27/2008 20:00:48 0:24:40 911.5 275.0 101569.9 101569.9 30643.7 -1.0 101569.9

02/27/2008 20:00:58 0:24:50 950.0 275.0 105860.0 105860.0 30643.7 -1.0 105860.0

02/27/2008 20:01:08 0:25:00 990.3 275.0 110350.7 110350.7 30643.7 -1.0 110350.7

02/27/2008 20:01:18 0:25:10 1090.0 275.0 121460.5 121460.5 30643.7 -1.0 121460.5

02/27/2008 20:01:28 0:25:20 1266.7 275.0 141150.4 141150.4 30643.7 -1.0 141150.4

02/27/2008 20:01:38 0:25:30 1545.3 275.0 172195.3 172195.3 30643.7 -1.0 172195.3

02/27/2008 20:01:48 0:25:40 2018.7 275.0 224947.0 224947.0 30643.7 -1.0 224947.0

02/27/2008 20:01:58 0:25:50 2192.2 275.0 244280.4 244280.4 30643.7 -1.0 244280.4

02/27/2008 20:02:08 0:26:00 2301.3 275.0 256437.6 256437.6 30643.7 -1.0 256437.6

02/27/2008 20:02:18 0:26:10 2305.5 275.0 256905.6 256905.6 30643.7 -1.0 256905.6

02/27/2008 20:02:28 0:26:20 2302.8 275.0 256604.8 256604.8 30643.7 -1.0 256604.8

02/27/2008 20:02:38 0:26:30 2232.2 275.0 248737.7 248737.7 30643.7 -1.0 248737.7

02/27/2008 20:02:48 0:26:40 2345.5 275.0 261362.9 261362.9 30643.7 -1.0 261362.9

02/27/2008 20:02:58 0:26:50 2282.8 275.0 254376.1 254376.1 30643.7 -1.0 254376.1

02/27/2008 20:03:08 0:27:00 2345.8 275.0 261396.3 261396.3 30643.7 -1.0 261396.3

02/27/2008 20:03:18 0:27:10 1971.7 275.0 219709.7 219709.7 30643.7 -1.0 219709.7

4

 REDACTED
CITGO

Coker Steam Vent Testing

URS THC Raw Data

Run 3

Average Dilution Ratio (Low) = 111.4 HIGH LOW

24 Hour Time

Elapsed

Time

THC1

(ppmw)

THC2

(ppmw)

Raw

X DLR 

(ppmw)

Actual

(ppmw)

Raw

X DLR 

(ppmw)

Actual

(ppmw)

Dual-Range

(ppmw)

HIGH - THC1 LOW - THC2

02/27/2008 20:03:28 0:27:20 1705.6 275.0 190057.8 190057.8 30643.7 -1.0 190057.8

02/27/2008 20:03:38 0:27:30 1749.9 275.0 194994.2 194994.2 30643.7 -1.0 194994.2

02/27/2008 20:03:48 0:27:40 1769.8 275.0 197211.7 197211.7 30643.7 -1.0 197211.7

02/27/2008 20:03:58 0:27:50 1241.1 275.0 138297.8 138297.8 30643.7 -1.0 138297.8

02/27/2008 20:04:08 0:28:00 660.0 275.0 73544.9 73544.9 30643.7 -1.0 73544.9

02/27/2008 20:04:18 0:28:10 338.0 275.0 37663.9 37663.9 30643.7 -1.0 37663.9

02/27/2008 20:04:28 0:28:20 307.9 275.0 34309.8 34309.8 30643.7 -1.0 34309.8

02/27/2008 20:04:38 0:28:30 379.0 275.0 42232.6 42232.6 30643.7 -1.0 42232.6

02/27/2008 20:04:48 0:28:40 335.6 255.6 37396.5 37396.5 28476.4 -1.0 37396.5

02/27/2008 20:04:58 0:28:50 460.8 275.0 51347.7 51347.7 30643.7 -1.0 51347.7

02/27/2008 20:05:08 0:29:00 515.3 275.0 57420.7 57420.7 30643.7 -1.0 57420.7

02/27/2008 20:05:18 0:29:10 531.3 275.0 59203.6 59203.6 30643.7 -1.0 59203.6

02/27/2008 20:05:28 0:29:20 627.5 275.0 69923.3 69923.3 30643.7 -1.0 69923.3

02/27/2008 20:05:38 0:29:30 857.0 275.0 95496.9 95496.9 30643.7 -1.0 95496.9

02/27/2008 20:05:48 0:29:40 806.2 275.0 89836.2 89836.2 30643.7 -1.0 89836.2

02/27/2008 20:05:58 0:29:50 498.6 275.0 55559.8 55559.8 30643.7 -1.0 55559.8

02/27/2008 20:06:08 0:30:00 187.6 240.5 20904.6 22286.3 26804.8 -1.0 22286.3

02/27/2008 20:06:18 0:30:10 80.7 116.2 8992.5 8992.5 12946.0 -1.0 8992.5

02/27/2008 20:06:28 0:30:20 58.2 59.7 6485.3 6485.3 6651.2 6651.2 6651.2

02/27/2008 20:06:38 0:30:30 26.2 31.0 2919.5 2919.5 3453.8 3453.8 3453.8

02/27/2008 20:06:48 0:30:40 39.4 41.4 4390.4 4390.4 4613.4 4613.4 4613.4

02/27/2008 20:06:58 0:30:50 33.0 35.3 3677.2 3677.2 3932.9 3932.9 3932.9

02/27/2008 20:07:08 0:31:00 34.5 37.2 3844.4 3844.4 4150.2 4150.2 4150.2

02/27/2008 20:07:18 0:31:10 25.3 27.3 2819.2 2819.2 3038.1 3038.1 3038.1

02/27/2008 20:07:28 0:31:20 30.9 31.7 3443.2 3443.2 3537.5 3537.5 3537.5

02/27/2008 20:07:38 0:31:30 43.1 44.7 4802.7 4802.7 4979.1 4979.1 4979.1

02/27/2008 20:07:48 0:31:40 40.2 42.2 4479.6 4479.6 4701.1 4701.1 4701.1

02/27/2008 20:07:58 0:31:50 42.3 44.8 4713.6 4713.6 4987.8 4987.8 4987.8

02/27/2008 20:08:08 0:32:00 44.3 46.8 4936.4 4936.4 5213.2 5213.2 5213.2

02/27/2008 20:08:18 0:32:10 39.1 40.9 4357.0 4357.0 4554.2 4554.2 4554.2

02/27/2008 20:08:28 0:32:20 40.4 41.3 4501.8 4501.8 4605.1 4605.1 4605.1

02/27/2008 20:08:38 0:32:30 43.8 45.5 4880.7 4880.7 5068.9 5068.9 5068.9

02/27/2008 20:08:48 0:32:40 40.2 42.0 4479.6 4479.6 4677.6 4677.6 4677.6

02/27/2008 20:08:58 0:32:50 42.1 44.3 4691.3 4691.3 4932.6 4932.6 4932.6

02/27/2008 20:09:08 0:33:00 41.9 44.5 4669.0 4669.0 4958.2 4958.2 4958.2

02/27/2008 20:09:18 0:33:10 35.8 37.5 3989.3 3989.3 4173.1 4173.1 4173.1

02/27/2008 20:09:28 0:33:20 36.7 37.4 4089.5 4089.5 4165.4 4165.4 4165.4

02/27/2008 20:09:38 0:33:30 40.9 42.6 4557.6 4557.6 4748.5 4748.5 4748.5

02/27/2008 20:09:48 0:33:40 35.5 38.0 3955.8 3955.8 4229.3 4229.3 4229.3

02/27/2008 20:09:58 0:33:50 32.1 33.6 3577.0 3577.0 3739.5 3739.5 3739.5

02/27/2008 20:10:08 0:34:00 34.7 35.4 3866.7 3866.7 3949.7 3949.7 3949.7

02/27/2008 20:10:18 0:34:10 38.2 39.5 4256.7 4256.7 4405.7 4405.7 4405.7

02/27/2008 20:10:28 0:34:20 34.5 36.5 3844.4 3844.4 4071.0 4071.0 4071.0

02/27/2008 20:10:38 0:34:30 29.1 30.6 3242.7 3242.7 3407.5 3407.5 3407.5

02/27/2008 20:10:48 0:34:40 30.6 31.5 3409.8 3409.8 3512.5 3512.5 3512.5

02/27/2008 20:10:58 0:34:50 30.8 31.7 3432.1 3432.1 3528.8 3528.8 3528.8

02/27/2008 20:11:08 0:35:00 27.2 28.8 3030.9 3030.9 3203.9 3203.9 3203.9

02/27/2008 20:11:18 0:35:10 25.2 26.4 2808.1 2808.1 2937.7 2937.7 2937.7

02/27/2008 20:11:28 0:35:20 27.4 27.9 3053.2 3053.2 3111.1 3111.1 3111.1

02/27/2008 20:11:38 0:35:30 28.6 29.7 3186.9 3186.9 3305.0 3305.0 3305.0

02/27/2008 20:11:48 0:35:40 25.2 26.6 2808.1 2808.1 2964.6 2964.6 2964.6

02/27/2008 20:11:58 0:35:50 23.0 23.5 2562.9 2562.9 2613.2 2613.2 2613.2

02/27/2008 20:12:08 0:36:00 6.0 6.9 668.6 668.6 770.2 770.2 770.2

02/27/2008 20:12:18 0:36:10 4.2 4.0 468.0 468.0 442.7 442.7 442.7

02/27/2008 20:12:28 0:36:20 3.8 3.6 423.4 423.4 395.8 395.8 395.8

02/27/2008 20:12:38 0:36:30 3.3 3.2 367.7 367.7 352.9 352.9 352.9

02/27/2008 20:12:48 0:36:40 3.2 3.0 356.6 356.6 329.4 329.4 329.4

02/27/2008 20:12:58 0:36:50 3.2 3.0 356.6 356.6 337.1 337.1 337.1

02/27/2008 20:13:08 0:37:00 112.2 143.0 12502.6 22286.3 15930.6 -1.0 22286.3

02/27/2008 20:13:18 0:37:10 25.5 26.9 2841.5 2841.5 2999.4 2999.4 2999.4

02/27/2008 20:13:28 0:37:20 20.1 20.5 2239.8 2239.8 2284.7 2284.7 2284.7

02/27/2008 20:13:38 0:37:30 18.4 18.9 2050.3 2050.3 2105.6 2105.6 2105.6

02/27/2008 20:13:48 0:37:40 17.0 17.6 1894.3 1894.3 1963.9 1963.9 1963.9

02/27/2008 20:13:58 0:37:50 16.2 16.8 1805.2 1805.2 1869.9 1869.9 1869.9

02/27/2008 20:14:08 0:38:00 16.9 17.1 1883.2 1883.2 1902.1 1902.1 1902.1

02/27/2008 20:14:18 0:38:10 37.7 36.3 4201.0 4201.0 4046.6 4046.6 4046.6

02/27/2008 20:14:28 0:38:20 166.6 208.7 18564.5 22286.3 23261.1 -1.0 22286.3

02/27/2008 20:14:38 0:38:30 410.5 275.0 45742.7 45742.7 30643.7 -1.0 45742.7

02/27/2008 20:14:48 0:38:40 635.4 275.0 70803.7 70803.7 30643.7 -1.0 70803.7

02/27/2008 20:14:58 0:38:50 880.4 275.0 98104.4 98104.4 30643.7 -1.0 98104.4

02/27/2008 20:15:08 0:39:00 761.3 275.0 84832.9 84832.9 30643.7 -1.0 84832.9

02/27/2008 20:15:18 0:39:10 271.3 269.3 30231.4 30231.4 30009.7 -1.0 30231.4

02/27/2008 20:15:28 0:39:20 100.7 151.0 11221.2 22286.3 16820.7 -1.0 22286.3

02/27/2008 20:15:38 0:39:30 40.9 45.2 4557.6 4557.6 5036.3 5036.3 5036.3

02/27/2008 20:15:48 0:39:40 21.4 23.5 2384.6 2384.6 2622.4 2622.4 2622.4

02/27/2008 20:15:58 0:39:50 17.9 18.8 1994.6 1994.6 2090.9 2090.9 2090.9

02/27/2008 20:16:08 0:40:00 21.6 22.0 2406.9 2406.9 2445.9 2445.9 2445.9

02/27/2008 20:16:18 0:40:10 24.0 24.9 2674.4 2674.4 2773.9 2773.9 2773.9

02/27/2008 20:16:28 0:40:20 19.4 20.6 2161.8 2161.8 2297.9 2297.9 2297.9

02/27/2008 20:16:38 0:40:30 19.8 20.4 2206.3 2206.3 2274.0 2274.0 2274.0

02/27/2008 20:16:48 0:40:40 22.5 22.7 2507.2 2507.2 2534.2 2534.2 2534.2

02/27/2008 20:16:58 0:40:50 21.8 22.2 2429.2 2429.2 2477.0 2477.0 2477.0

4

 REDACTED
CITGO

Coker Steam Vent Testing

URS THC Raw Data

Run 3

Average Dilution Ratio (Low) = 111.4 HIGH LOW

24 Hour Time

Elapsed

Time

THC1

(ppmw)

THC2

(ppmw)

Raw

X DLR 

(ppmw)

Actual

(ppmw)

Raw

X DLR 

(ppmw)

Actual

(ppmw)

Dual-Range

(ppmw)

HIGH - THC1 LOW - THC2

02/27/2008 20:17:08 0:41:00 20.4 21.3 2273.2 2273.2 2370.9 2370.9 2370.9

02/27/2008 20:17:18 0:41:10 20.9 21.4 2328.9 2328.9 2381.1 2381.1 2381.1

02/27/2008 20:17:28 0:41:20 22.5 22.8 2507.2 2507.2 2538.7 2538.7 2538.7

02/27/2008 20:17:38 0:41:30 22.6 23.2 2518.4 2518.4 2581.1 2581.1 2581.1

02/27/2008 20:17:48 0:41:40 20.8 21.6 2317.8 2317.8 2411.7 2411.7 2411.7

02/27/2008 20:17:58 0:41:50 20.6 21.0 2295.5 2295.5 2343.4 2343.4 2343.4

02/27/2008 20:18:08 0:42:00 21.6 21.8 2406.9 2406.9 2434.1 2434.1 2434.1

02/27/2008 20:18:18 0:42:10 20.6 21.4 2295.5 2295.5 2379.6 2379.6 2379.6

02/27/2008 20:18:28 0:42:20 20.3 20.6 2262.1 2262.1 2293.4 2293.4 2293.4

02/27/2008 20:18:38 0:42:30 19.8 20.0 2206.3 2206.3 2231.1 2231.1 2231.1

02/27/2008 20:18:48 0:42:40 18.9 19.5 2106.1 2106.1 2169.9 2169.9 2169.9

02/27/2008 20:18:58 0:42:50 18.4 18.7 2050.3 2050.3 2081.7 2081.7 2081.7

02/27/2008 20:19:08 0:43:00 18.9 19.1 2106.1 2106.1 2129.6 2129.6 2129.6

02/27/2008 20:19:18 0:43:10 18.1 18.5 2016.9 2016.9 2060.7 2060.7 2060.7

02/27/2008 20:19:28 0:43:20 17.2 17.5 1916.6 1916.6 1951.1 1951.1 1951.1

02/27/2008 20:19:38 0:43:30 17.4 17.5 1938.9 1938.9 1948.5 1948.5 1948.5

02/27/2008 20:19:48 0:43:40 16.5 16.8 1838.6 1838.6 1871.0 1871.0 1871.0

02/27/2008 20:19:58 0:43:50 16.0 16.2 1782.9 1782.9 1802.6 1802.6 1802.6

02/27/2008 20:20:08 0:44:00 16.2 16.3 1805.2 1805.2 1813.9 1813.9 1813.9

02/27/2008 20:20:18 0:44:10 15.7 16.0 1749.5 1749.5 1777.7 1777.7 1777.7

02/27/2008 20:20:28 0:44:20 15.2 15.3 1693.8 1693.8 1707.8 1707.8 1707.8

02/27/2008 20:20:38 0:44:30 14.8 15.0 1649.2 1649.2 1671.0 1671.0 1671.0

02/27/2008 20:20:48 0:44:40 14.0 14.1 1560.0 1560.0 1570.5 1570.5 1570.5

02/27/2008 20:20:58 0:44:50 14.3 14.4 1593.5 1593.5 1607.3 1607.3 1607.3

02/27/2008 20:21:08 0:45:00 14.0 14.2 1560.0 1560.0 1577.6 1577.6 1577.6

02/27/2008 20:21:18 0:45:10 20.6 20.0 2295.5 2295.5 2230.1 2230.1 2230.1

02/27/2008 20:21:28 0:45:20 52.6 52.9 5861.3 5861.3 5890.2 5890.2 5890.2

02/27/2008 20:21:38 0:45:30 102.4 138.2 11410.6 22286.3 15404.6 -1.0 22286.3

02/27/2008 20:21:48 0:45:40 97.8 129.3 10898.0 10898.0 14410.0 -1.0 10898.0

02/27/2008 20:21:58 0:45:50 47.2 50.3 5259.6 5259.6 5599.9 5599.9 5599.9

Data Points 276.0 276.0 276.0

Maximum 2924.1 275.0 325837.2

Minimum 2.8 3.0 329.4

Average 639.5 116.7 71534.7

4

 REDACTED
CITGO

Coker Steam Vent Testing

URS THC Raw Data

Run 4

Average Dilution Ratio (Low) = 107.2 HIGH LOW

24 Hour Time

Elapsed

Time

THC1

(ppmw)

THC2

(ppmw)

Raw

X DLR 

(ppmw)

Actual

(ppmw)

Raw

X DLR 

(ppmw)

Actual

(ppmw)

Dual-Range

(ppmw)

02/28/2008 17:57:01 0:00:00 8.7 9.5 932.2 932.2 1023.1 1023.1 1023.1

02/28/2008 17:57:11 0:00:10 9.1 9.9 975.1 975.1 1062.9 1062.9 1062.9

02/28/2008 17:57:21 0:00:20 9.2 10.0 985.8 985.8 1074.2 1074.2 1074.2

02/28/2008 17:57:31 0:00:30 10.3 11.1 1103.7 1103.7 1188.0 1188.0 1188.0

02/28/2008 17:57:41 0:00:40 10.3 11.3 1103.7 1103.7 1213.5 1213.5 1213.5

02/28/2008 17:57:51 0:00:50 9.8 10.7 1050.1 1050.1 1141.8 1141.8 1141.8

02/28/2008 17:58:01 0:01:00 7.9 8.6 846.5 846.5 925.6 925.6 925.6

02/28/2008 17:58:11 0:01:10 6.5 6.9 696.5 696.5 744.5 744.5 744.5

02/28/2008 17:58:21 0:01:20 5.9 6.0 632.2 632.2 638.1 638.1 638.1

02/28/2008 17:58:31 0:01:30 5.2 4.9 557.2 557.2 529.7 529.7 529.7

02/28/2008 17:58:41 0:01:40 3.8 3.3 407.2 407.2 352.6 352.6 352.6

02/28/2008 17:58:51 0:01:50 7.9 7.3 846.5 846.5 786.7 786.7 786.7

02/28/2008 17:59:01 0:02:00 5.5 5.3 589.3 589.3 569.4 569.4 569.4

02/28/2008 17:59:11 0:02:10 2.5 2.0 267.9 267.9 219.2 219.2 219.2

02/28/2008 17:59:21 0:02:20 1.3 0.6 139.3 214.3 65.7 214.3 214.3

02/28/2008 17:59:31 0:02:30 0.9 0.2 96.4 214.3 21.5 214.3 214.3

02/28/2008 17:59:41 0:02:40 0.4 -0.4 42.9 214.3 -37.8 214.3 214.3

02/28/2008 17:59:51 0:02:50 0.1 -0.6 10.7 214.3 -63.9 214.3 214.3

02/28/2008 18:00:01 0:03:00 -0.1 -0.7 -10.7 214.3 -72.2 214.3 214.3

02/28/2008 18:00:11 0:03:10 0.1 -0.7 10.7 214.3 -70.7 214.3 214.3

02/28/2008 18:00:21 0:03:20 -0.1 -0.6 -10.7 214.3 -69.2 214.3 214.3

02/28/2008 18:00:31 0:03:30 0.1 -0.6 10.7 214.3 -60.9 214.3 214.3

02/28/2008 18:00:41 0:03:40 0.3 -0.4 32.1 214.3 -43.7 214.3 214.3

02/28/2008 18:00:51 0:03:50 0.3 -0.5 32.1 214.3 -49.6 214.3 214.3

02/28/2008 18:01:01 0:04:00 0.3 -0.4 32.1 214.3 -47.7 214.3 214.3

02/28/2008 18:01:11 0:04:10 0.3 -0.4 32.1 214.3 -44.3 214.3 214.3

02/28/2008 18:01:21 0:04:20 0.3 -0.4 32.1 214.3 -48.1 214.3 214.3

02/28/2008 18:01:31 0:04:30 0.3 -0.5 32.1 214.3 -48.6 214.3 214.3

02/28/2008 18:01:41 0:04:40 0.4 -0.4 42.9 214.3 -41.3 214.3 214.3

02/28/2008 18:01:51 0:04:50 0.4 -0.3 42.9 214.3 -29.5 214.3 214.3

02/28/2008 18:02:01 0:05:00 0.6 -0.1 64.3 214.3 -7.4 214.3 214.3

02/28/2008 18:02:11 0:05:10 0.6 -0.1 64.3 214.3 -14.4 214.3 214.3

02/28/2008 18:02:21 0:05:20 0.6 -0.2 64.3 214.3 -17.8 214.3 214.3

02/28/2008 18:02:31 0:05:30 0.6 -0.3 64.3 214.3 -27.5 214.3 214.3

02/28/2008 18:02:41 0:05:40 0.4 -0.4 42.9 214.3 -37.8 214.3 214.3

02/28/2008 18:02:51 0:05:50 0.4 -0.4 42.9 214.3 -39.9 214.3 214.3

02/28/2008 18:03:01 0:06:00 0.6 -0.1 64.3 214.3 -12.3 214.3 214.3

02/28/2008 18:03:11 0:06:10 0.6 -0.1 64.3 214.3 -15.8 214.3 214.3

02/28/2008 18:03:21 0:06:20 0.6 -0.2 64.3 214.3 -17.3 214.3 214.3

02/28/2008 18:03:31 0:06:30 0.8 0.0 85.7 214.3 -4.0 214.3 214.3

02/28/2008 18:03:41 0:06:40 0.6 -0.2 64.3 214.3 -20.1 214.3 214.3

02/28/2008 18:03:51 0:06:50 0.6 -0.2 64.3 214.3 -16.7 214.3 214.3

02/28/2008 18:04:01 0:07:00 0.6 -0.2 64.3 214.3 -20.7 214.3 214.3

02/28/2008 18:04:11 0:07:10 0.6 -0.2 64.3 214.3 -24.1 214.3 214.3

02/28/2008 18:04:21 0:07:20 0.6 -0.2 64.3 214.3 -19.7 214.3 214.3

02/28/2008 18:04:31 0:07:30 0.6 -0.1 64.3 214.3 -11.4 214.3 214.3

02/28/2008 18:04:41 0:07:40 0.6 -0.1 64.3 214.3 -9.4 214.3 214.3

02/28/2008 18:04:51 0:07:50 0.6 -0.1 64.3 214.3 -14.8 214.3 214.3

02/28/2008 18:05:01 0:08:00 0.6 -0.1 64.3 214.3 -15.3 214.3 214.3

02/28/2008 18:05:11 0:08:10 0.6 -0.1 64.3 214.3 -13.8 214.3 214.3

02/28/2008 18:05:21 0:08:20 0.6 -0.1 64.3 214.3 -12.9 214.3 214.3

02/28/2008 18:05:31 0:08:30 0.8 0.0 85.7 214.3 -0.1 214.3 214.3

02/28/2008 18:05:41 0:08:40 0.8 0.0 85.7 214.3 0.4 214.3 214.3

02/28/2008 18:05:51 0:08:50 0.4 -0.3 42.9 214.3 -31.9 214.3 214.3

02/28/2008 18:06:01 0:09:00 0.3 -0.5 32.1 214.3 -49.2 214.3 214.3

02/28/2008 18:06:11 0:09:10 0.4 -0.3 42.9 214.3 -35.9 214.3 214.3

02/28/2008 18:06:21 0:09:20 0.6 -0.2 64.3 214.3 -17.8 214.3 214.3

02/28/2008 18:06:31 0:09:30 0.6 0.0 64.3 214.3 -5.0 214.3 214.3

02/28/2008 18:06:41 0:09:40 0.8 0.0 85.7 214.3 4.3 214.3 214.3

02/28/2008 18:06:51 0:09:50 0.8 0.1 85.7 214.3 14.1 214.3 214.3

02/28/2008 18:07:01 0:10:00 0.9 0.3 96.4 214.3 27.9 214.3 214.3

02/28/2008 18:07:11 0:10:10 0.9 0.3 96.4 214.3 31.8 214.3 214.3

02/28/2008 18:07:21 0:10:20 0.8 0.1 85.7 214.3 10.7 214.3 214.3

02/28/2008 18:07:31 0:10:30 0.8 0.0 85.7 214.3 1.9 214.3 214.3

02/28/2008 18:07:41 0:10:40 1.6 0.8 171.4 214.3 89.7 214.3 214.3

02/28/2008 18:07:51 0:10:50 2.5 1.9 267.9 267.9 203.0 214.3 214.3

02/28/2008 18:08:01 0:11:00 3.3 2.8 353.6 353.6 299.2 299.2 299.2

02/28/2008 18:08:11 0:11:10 45.3 51.4 4854.1 4854.1 5513.0 5513.0 5513.0

02/28/2008 18:08:21 0:11:20 843.8 275.0 90416.7 90416.7 29467.4 -1.0 90416.7

02/28/2008 18:08:31 0:11:30 1678.6 275.0 179869.1 179869.1 29467.4 -1.0 179869.1

02/28/2008 18:08:41 0:11:40 2047.2 275.0 219366.1 219366.1 29467.4 -1.0 219366.1

02/28/2008 18:08:51 0:11:50 2560.1 275.0 274325.5 274325.5 29467.4 -1.0 274325.5

02/28/2008 18:09:01 0:12:00 2622.2 275.0 280979.8 280979.8 29467.4 -1.0 280979.8

02/28/2008 18:09:11 0:12:10 1738.1 275.0 186244.7 186244.7 29467.4 -1.0 186244.7

02/28/2008 18:09:21 0:12:20 340.6 275.0 36496.7 36496.7 29467.4 -1.0 36496.7

02/28/2008 18:09:31 0:12:30 69.5 88.0 7447.2 7447.2 9429.8 9429.8 9429.8

02/28/2008 18:09:41 0:12:40 19.8 19.8 2121.7 2121.7 2120.5 2120.5 2120.5

02/28/2008 18:09:51 0:12:50 14.5 13.8 1553.7 1553.7 1476.4 1476.4 1476.4

02/28/2008 18:10:01 0:13:00 26.2 24.7 2807.4 2807.4 2650.8 2650.8 2650.8

02/28/2008 18:10:11 0:13:10 69.9 71.6 7490.1 7490.1 7667.3 7667.3 7667.3

02/28/2008 18:10:21 0:13:20 51.8 53.8 5550.6 5550.6 5768.5 5768.5 5768.5

02/28/2008 18:10:31 0:13:30 33.6 34.5 3600.4 3600.4 3699.9 3699.9 3699.9

HIGH - THC1 LOW - THC2

4

 REDACTED
CITGO

Coker Steam Vent Testing

URS THC Raw Data

Run 4

Average Dilution Ratio (Low) = 107.2 HIGH LOW

24 Hour Time

Elapsed

Time

THC1

(ppmw)

THC2

(ppmw)

Raw

X DLR 

(ppmw)

Actual

(ppmw)

Raw

X DLR 

(ppmw)

Actual

(ppmw)

Dual-Range

(ppmw)

HIGH - THC1 LOW - THC2

02/28/2008 18:10:41 0:13:40 28.6 29.0 3064.6 3064.6 3103.9 3103.9 3103.9

02/28/2008 18:10:51 0:13:50 23.5 23.9 2518.1 2518.1 2561.4 2561.4 2561.4

02/28/2008 18:11:01 0:14:00 20.4 20.4 2185.9 2185.9 2191.1 2191.1 2191.1

02/28/2008 18:11:11 0:14:10 21.8 21.7 2336.0 2336.0 2322.6 2322.6 2322.6

02/28/2008 18:11:21 0:14:20 19.1 19.0 2046.6 2046.6 2036.1 2036.1 2036.1

02/28/2008 18:11:31 0:14:30 20.9 20.8 2239.5 2239.5 2231.8 2231.8 2231.8

02/28/2008 18:11:41 0:14:40 20.9 21.0 2239.5 2239.5 2252.4 2252.4 2252.4

02/28/2008 18:11:51 0:14:50 19.8 19.6 2121.7 2121.7 2104.3 2104.3 2104.3

02/28/2008 18:12:01 0:15:00 19.8 19.7 2121.7 2121.7 2110.2 2110.2 2110.2

02/28/2008 18:12:11 0:15:10 20.3 20.2 2175.2 2175.2 2166.6 2166.6 2166.6

02/28/2008 18:12:21 0:15:20 14.2 16.3 1521.6 1521.6 1741.3 1741.3 1741.3

02/28/2008 18:12:31 0:15:30 12.0 12.7 1285.9 1285.9 1366.0 1366.0 1366.0

02/28/2008 18:12:41 0:15:40 1.5 0.9 160.7 214.3 96.5 214.3 214.3

02/28/2008 18:12:51 0:15:50 13.5 13.8 1446.6 1446.6 1473.9 1473.9 1473.9

02/28/2008 18:13:01 0:16:00 18.6 20.3 1993.1 1993.1 2178.9 2178.9 2178.9

02/28/2008 18:13:11 0:16:10 7.7 7.8 825.1 825.1 833.3 833.3 833.3

02/28/2008 18:13:21 0:16:20 8.1 7.0 867.9 867.9 753.4 753.4 753.4

02/28/2008 18:13:31 0:16:30 18.7 18.9 2003.8 2003.8 2022.3 2022.3 2022.3

02/28/2008 18:13:41 0:16:40 11.5 11.2 1232.3 1232.3 1202.7 1202.7 1202.7

02/28/2008 18:13:51 0:16:50 10.1 9.9 1082.3 1082.3 1055.6 1055.6 1055.6

02/28/2008 18:14:01 0:17:00 9.6 9.2 1028.7 1028.7 982.0 982.0 982.0

02/28/2008 18:14:11 0:17:10 8.6 8.2 921.5 921.5 877.5 877.5 877.5

02/28/2008 18:14:21 0:17:20 8.7 8.4 932.2 932.2 900.5 900.5 900.5

02/28/2008 18:14:31 0:17:30 10.8 10.5 1157.3 1157.3 1121.3 1121.3 1121.3

02/28/2008 18:14:41 0:17:40 8.7 8.4 932.2 932.2 895.2 895.2 895.2

02/28/2008 18:14:51 0:17:50 10.3 9.9 1103.7 1103.7 1064.4 1064.4 1064.4

02/28/2008 18:15:01 0:18:00 10.9 10.7 1168.0 1168.0 1143.3 1143.3 1143.3

02/28/2008 18:15:11 0:18:10 12.3 12.0 1318.0 1318.0 1280.7 1280.7 1280.7

02/28/2008 18:15:21 0:18:20 12.0 11.7 1285.9 1285.9 1258.1 1258.1 1258.1

02/28/2008 18:15:31 0:18:30 10.3 10.1 1103.7 1103.7 1083.5 1083.5 1083.5

02/28/2008 18:15:41 0:18:40 7.6 7.1 814.4 814.4 756.3 756.3 756.3

02/28/2008 18:15:51 0:18:50 7.6 7.2 814.4 814.4 771.5 771.5 771.5

02/28/2008 18:16:01 0:19:00 7.9 7.5 846.5 846.5 801.4 801.4 801.4

02/28/2008 18:16:11 0:19:10 7.4 6.9 792.9 792.9 739.7 739.7 739.7

02/28/2008 18:16:21 0:19:20 8.1 7.7 867.9 867.9 824.4 824.4 824.4

02/28/2008 18:16:31 0:19:30 10.3 10.0 1103.7 1103.7 1073.7 1073.7 1073.7

02/28/2008 18:16:41 0:19:40 10.1 9.9 1082.3 1082.3 1056.0 1056.0 1056.0

02/28/2008 18:16:51 0:19:50 9.8 9.4 1050.1 1050.1 1004.0 1004.0 1004.0

02/28/2008 18:17:01 0:20:00 8.7 8.4 932.2 932.2 899.0 899.0 899.0

02/28/2008 18:17:11 0:20:10 7.2 6.8 771.5 771.5 728.3 728.3 728.3

02/28/2008 18:17:21 0:20:20 7.0 6.6 750.1 750.1 711.7 711.7 711.7

02/28/2008 18:17:31 0:20:30 6.9 6.4 739.4 739.4 685.1 685.1 685.1

02/28/2008 18:17:41 0:20:40 5.5 5.1 589.3 589.3 549.3 549.3 549.3

02/28/2008 18:17:51 0:20:50 5.5 4.9 589.3 589.3 526.8 526.8 526.8

02/28/2008 18:18:01 0:21:00 6.9 6.3 739.4 739.4 675.4 675.4 675.4

02/28/2008 18:18:11 0:21:10 6.4 5.9 685.8 685.8 636.6 636.6 636.6

02/28/2008 18:18:21 0:21:20 6.0 5.5 642.9 642.9 593.0 593.0 593.0

02/28/2008 18:18:31 0:21:30 5.7 5.1 610.8 610.8 544.9 544.9 544.9

02/28/2008 18:18:41 0:21:40 5.4 4.8 578.6 578.6 513.5 513.5 513.5

02/28/2008 18:18:51 0:21:50 5.2 4.7 557.2 557.2 498.8 498.8 498.8

02/28/2008 18:19:01 0:22:00 5.2 4.5 557.2 557.2 482.1 482.1 482.1

02/28/2008 18:19:11 0:22:10 5.0 4.5 535.8 535.8 480.2 480.2 480.2

02/28/2008 18:19:21 0:22:20 5.0 4.5 535.8 535.8 479.2 479.2 479.2

02/28/2008 18:19:31 0:22:30 5.0 4.3 535.8 535.8 465.9 465.9 465.9

02/28/2008 18:19:41 0:22:40 4.7 4.2 503.6 503.6 448.8 448.8 448.8

02/28/2008 18:19:51 0:22:50 4.7 4.1 503.6 503.6 439.4 439.4 439.4

02/28/2008 18:20:01 0:23:00 4.5 3.9 482.2 482.2 422.3 422.3 422.3

02/28/2008 18:20:11 0:23:10 4.3 3.8 460.8 460.8 409.0 409.0 409.0

02/28/2008 18:20:21 0:23:20 4.3 3.8 460.8 460.8 402.1 402.1 402.1

02/28/2008 18:20:31 0:23:30 4.2 3.7 450.0 450.0 392.8 392.8 392.8

02/28/2008 18:20:41 0:23:40 4.3 3.7 460.8 460.8 399.7 399.7 399.7

02/28/2008 18:20:51 0:23:50 4.2 3.6 450.0 450.0 388.9 388.9 388.9

02/28/2008 18:21:01 0:24:00 4.0 3.4 428.6 428.6 364.4 364.4 364.4

02/28/2008 18:21:11 0:24:10 3.8 3.3 407.2 407.2 349.2 349.2 349.2

02/28/2008 18:21:21 0:24:20 3.8 3.2 407.2 407.2 344.7 344.7 344.7

02/28/2008 18:21:31 0:24:30 3.7 3.0 396.5 396.5 319.7 319.7 319.7

02/28/2008 18:21:41 0:24:40 3.3 2.8 353.6 353.6 295.7 295.7 295.7

02/28/2008 18:21:51 0:24:50 3.3 2.6 353.6 353.6 279.0 279.0 279.0

02/28/2008 18:22:01 0:25:00 3.0 2.4 321.5 321.5 255.5 255.5 255.5

02/28/2008 18:22:11 0:25:10 3.0 2.3 321.5 321.5 248.2 248.2 248.2

02/28/2008 18:22:21 0:25:20 2.8 2.2 300.0 300.0 240.8 240.8 240.8

02/28/2008 18:22:31 0:25:30 2.8 2.3 300.0 300.0 242.7 242.7 242.7

02/28/2008 18:22:41 0:25:40 2.8 2.3 300.0 300.0 241.3 241.3 241.3

02/28/2008 18:22:51 0:25:50 2.8 2.2 300.0 300.0 233.9 233.9 233.9

02/28/2008 18:23:01 0:26:00 2.6 2.1 278.6 278.6 223.1 223.1 223.1

02/28/2008 18:23:11 0:26:10 2.6 2.0 278.6 278.6 210.9 214.3 214.3

02/28/2008 18:23:21 0:26:20 2.5 1.9 267.9 267.9 201.0 214.3 214.3

02/28/2008 18:23:31 0:26:30 2.3 1.7 246.5 246.5 183.3 214.3 214.3

02/28/2008 18:23:41 0:26:40 2.3 1.7 246.5 246.5 179.5 214.3 214.3

02/28/2008 18:23:51 0:26:50 2.3 1.7 246.5 246.5 184.8 214.3 214.3

02/28/2008 18:24:01 0:27:00 2.3 1.8 246.5 246.5 188.3 214.3 214.3

02/28/2008 18:24:11 0:27:10 2.3 1.7 246.5 246.5 180.9 214.3 214.3

4

 REDACTED
CITGO

Coker Steam Vent Testing

URS THC Raw Data

Run 4

Average Dilution Ratio (Low) = 107.2 HIGH LOW

24 Hour Time

Elapsed

Time

THC1

(ppmw)

THC2

(ppmw)

Raw

X DLR 

(ppmw)

Actual

(ppmw)

Raw

X DLR 

(ppmw)

Actual

(ppmw)

Dual-Range

(ppmw)

HIGH - THC1 LOW - THC2

02/28/2008 18:24:21 0:27:20 2.1 1.5 225.0 225.0 157.8 214.3 214.3

02/28/2008 18:24:31 0:27:30 2.0 1.3 214.3 214.3 137.3 214.3 214.3

02/28/2008 18:24:41 0:27:40 2.0 1.2 214.3 214.3 133.8 214.3 214.3

02/28/2008 18:24:51 0:27:50 1.8 1.2 192.9 214.3 128.5 214.3 214.3

02/28/2008 18:25:01 0:28:00 1.8 1.1 192.9 214.3 121.1 214.3 214.3

02/28/2008 18:25:11 0:28:10 1.8 1.1 192.9 214.3 119.6 214.3 214.3

02/28/2008 18:25:21 0:28:20 1.6 1.1 171.4 214.3 122.6 214.3 214.3

02/28/2008 18:25:31 0:28:30 0.8 0.2 85.7 214.3 18.1 214.3 214.3

02/28/2008 18:25:41 0:28:40 0.9 0.2 96.4 214.3 26.4 214.3 214.3

02/28/2008 18:25:51 0:28:50 1.5 0.8 160.7 214.3 89.7 214.3 214.3

02/28/2008 18:26:01 0:29:00 2.0 1.2 214.3 214.3 128.5 214.3 214.3

02/28/2008 18:26:11 0:29:10 2.3 1.7 246.5 246.5 185.8 214.3 214.3

02/28/2008 18:26:21 0:29:20 1.8 1.1 192.9 214.3 114.2 214.3 214.3

02/28/2008 18:26:31 0:29:30 1.5 0.8 160.7 214.3 90.7 214.3 214.3

02/28/2008 18:26:41 0:29:40 1.5 0.8 160.7 214.3 84.8 214.3 214.3

02/28/2008 18:26:51 0:29:50 1.3 0.7 139.3 214.3 70.5 214.3 214.3

02/28/2008 18:27:01 0:30:00 1.1 0.5 117.9 214.3 54.9 214.3 214.3

02/28/2008 18:27:11 0:30:10 1.1 0.4 117.9 214.3 48.0 214.3 214.3

02/28/2008 18:27:21 0:30:20 1.1 0.5 117.9 214.3 49.5 214.3 214.3

02/28/2008 18:27:31 0:30:30 1.1 0.4 117.9 214.3 47.0 214.3 214.3

02/28/2008 18:27:41 0:30:40 0.9 0.4 96.4 214.3 40.2 214.3 214.3

02/28/2008 18:27:51 0:30:50 0.6 0.0 64.3 214.3 2.4 214.3 214.3

02/28/2008 18:28:01 0:31:00 0.6 -0.2 64.3 214.3 -18.8 214.3 214.3

02/28/2008 18:28:11 0:31:10 1.3 0.6 139.3 214.3 67.6 214.3 214.3

02/28/2008 18:28:21 0:31:20 1.1 0.5 117.9 214.3 56.4 214.3 214.3

02/28/2008 18:28:31 0:31:30 0.9 0.3 96.4 214.3 33.3 214.3 214.3

02/28/2008 18:28:41 0:31:40 0.9 0.2 96.4 214.3 26.4 214.3 214.3

02/28/2008 18:28:51 0:31:50 0.9 0.2 96.4 214.3 22.5 214.3 214.3

02/28/2008 18:29:01 0:32:00 0.9 0.2 96.4 214.3 17.6 214.3 214.3

02/28/2008 18:29:11 0:32:10 0.8 0.1 85.7 214.3 10.2 214.3 214.3

02/28/2008 18:29:21 0:32:20 0.8 0.0 85.7 214.3 4.8 214.3 214.3

02/28/2008 18:29:31 0:32:30 0.8 0.0 85.7 214.3 1.9 214.3 214.3

02/28/2008 18:29:41 0:32:40 0.6 0.0 64.3 214.3 2.4 214.3 214.3

02/28/2008 18:29:51 0:32:50 0.6 0.0 64.3 214.3 -2.6 214.3 214.3

02/28/2008 18:30:01 0:33:00 0.6 -0.1 64.3 214.3 -5.5 214.3 214.3

02/28/2008 18:30:11 0:33:10 0.6 -0.1 64.3 214.3 -8.5 214.3 214.3

02/28/2008 18:30:21 0:33:20 0.6 -0.1 64.3 214.3 -9.9 214.3 214.3

02/28/2008 18:30:31 0:33:30 0.6 -0.1 64.3 214.3 -13.8 214.3 214.3

02/28/2008 18:30:41 0:33:40 0.6 -0.2 64.3 214.3 -16.3 214.3 214.3

02/28/2008 18:30:51 0:33:50 0.6 -0.2 64.3 214.3 -20.7 214.3 214.3

02/28/2008 18:31:01 0:34:00 0.6 -0.2 64.3 214.3 -23.1 214.3 214.3

02/28/2008 18:31:11 0:34:10 0.6 -0.2 64.3 214.3 -23.1 214.3 214.3

02/28/2008 18:31:21 0:34:20 0.6 -0.2 64.3 214.3 -23.6 214.3 214.3

02/28/2008 18:31:31 0:34:30 0.4 -0.3 42.9 214.3 -29.5 214.3 214.3

02/28/2008 18:31:41 0:34:40 0.4 -0.3 42.9 214.3 -32.9 214.3 214.3

02/28/2008 18:31:51 0:34:50 0.4 -0.3 42.9 214.3 -35.4 214.3 214.3

02/28/2008 18:32:01 0:35:00 0.4 -0.3 42.9 214.3 -35.9 214.3 214.3

02/28/2008 18:32:11 0:35:10 0.4 -0.4 42.9 214.3 -38.4 214.3 214.3

02/28/2008 18:32:21 0:35:20 0.4 -0.4 42.9 214.3 -40.8 214.3 214.3

02/28/2008 18:32:31 0:35:30 0.3 -0.4 32.1 214.3 -43.7 214.3 214.3

02/28/2008 18:32:41 0:35:40 0.3 -0.4 32.1 214.3 -45.6 214.3 214.3

02/28/2008 18:32:51 0:35:50 0.3 -0.4 32.1 214.3 -47.1 214.3 214.3

02/28/2008 18:33:01 0:36:00 0.3 -0.5 32.1 214.3 -48.6 214.3 214.3

02/28/2008 18:33:11 0:36:10 0.3 -0.5 32.1 214.3 -52.1 214.3 214.3

02/28/2008 18:33:21 0:36:20 0.3 -0.5 32.1 214.3 -53.0 214.3 214.3

02/28/2008 18:33:31 0:36:30 0.3 -0.5 32.1 214.3 -56.0 214.3 214.3

02/28/2008 18:33:41 0:36:40 0.1 -0.6 10.7 214.3 -59.5 214.3 214.3

02/28/2008 18:33:51 0:36:50 -0.1 -0.6 -10.7 214.3 -64.3 214.3 214.3

02/28/2008 18:34:01 0:37:00 0.1 -0.6 10.7 214.3 -63.9 214.3 214.3

02/28/2008 18:34:11 0:37:10 -0.1 -0.6 -10.7 214.3 -66.3 214.3 214.3

02/28/2008 18:34:21 0:37:20 -0.1 -0.6 -10.7 214.3 -67.7 214.3 214.3

02/28/2008 18:34:31 0:37:30 -0.1 -0.6 -10.7 214.3 -67.7 214.3 214.3

02/28/2008 18:34:41 0:37:40 -0.1 -0.6 -10.7 214.3 -67.7 214.3 214.3

02/28/2008 18:34:51 0:37:50 -0.1 -0.7 -10.7 214.3 -70.2 214.3 214.3

02/28/2008 18:35:01 0:38:00 -0.1 -0.7 -10.7 214.3 -70.2 214.3 214.3

02/28/2008 18:35:11 0:38:10 -0.1 -0.7 -10.7 214.3 -71.7 214.3 214.3

02/28/2008 18:35:21 0:38:20 -0.1 -0.7 -10.7 214.3 -73.6 214.3 214.3

02/28/2008 18:35:31 0:38:30 -0.2 -0.7 -21.4 214.3 -75.7 214.3 214.3

02/28/2008 18:35:41 0:38:40 -0.2 -0.7 -21.4 214.3 -76.6 214.3 214.3

02/28/2008 18:35:51 0:38:50 -0.2 -0.7 -21.4 214.3 -78.1 214.3 214.3

02/28/2008 18:36:01 0:39:00 -0.2 -0.7 -21.4 214.3 -78.5 214.3 214.3

02/28/2008 18:36:11 0:39:10 -0.2 -0.7 -21.4 214.3 -79.5 214.3 214.3

02/28/2008 18:36:21 0:39:20 -0.1 -0.8 -10.7 214.3 -80.6 214.3 214.3

02/28/2008 18:36:31 0:39:30 -0.1 -0.8 -10.7 214.3 -81.0 214.3 214.3

02/28/2008 18:36:41 0:39:40 -0.1 -0.7 -10.7 214.3 -80.0 214.3 214.3

02/28/2008 18:36:51 0:39:50 -0.2 -0.8 -21.4 214.3 -83.5 214.3 214.3

02/28/2008 18:37:01 0:40:00 -0.2 -0.8 -21.4 214.3 -85.0 214.3 214.3

02/28/2008 18:37:11 0:40:10 -0.2 -0.8 -21.4 214.3 -85.4 214.3 214.3

02/28/2008 18:37:21 0:40:20 -0.2 -0.8 -21.4 214.3 -87.4 214.3 214.3

02/28/2008 18:37:31 0:40:30 -0.4 -0.8 -42.9 214.3 -90.3 214.3 214.3

02/28/2008 18:37:41 0:40:40 -0.4 -0.9 -42.9 214.3 -93.3 214.3 214.3

02/28/2008 18:37:51 0:40:50 -0.4 -0.9 -42.9 214.3 -96.2 214.3 214.3

4

 REDACTED
CITGO

Coker Steam Vent Testing

URS THC Raw Data

Run 4

Average Dilution Ratio (Low) = 107.2 HIGH LOW

24 Hour Time

Elapsed

Time

THC1

(ppmw)

THC2

(ppmw)

Raw

X DLR 

(ppmw)

Actual

(ppmw)

Raw

X DLR 

(ppmw)

Actual

(ppmw)

Dual-Range

(ppmw)

HIGH - THC1 LOW - THC2

02/28/2008 18:38:01 0:41:00 -0.4 -0.9 -42.9 214.3 -96.2 214.3 214.3

02/28/2008 18:38:11 0:41:10 -0.4 -0.9 -42.9 214.3 -96.8 214.3 214.3

02/28/2008 18:38:21 0:41:20 -0.4 -0.9 -42.9 214.3 -97.2 214.3 214.3

02/28/2008 18:38:31 0:41:30 -0.4 -0.9 -42.9 214.3 -99.7 214.3 214.3

02/28/2008 18:38:41 0:41:40 -0.4 -0.9 -42.9 214.3 -99.7 214.3 214.3

02/28/2008 18:38:51 0:41:50 -0.4 -0.9 -42.9 214.3 -99.7 214.3 214.3

02/28/2008 18:39:01 0:42:00 -0.4 -0.9 -42.9 214.3 -99.7 214.3 214.3

02/28/2008 18:39:11 0:42:10 -0.4 -0.9 -42.9 214.3 -101.2 214.3 214.3

02/28/2008 18:39:21 0:42:20 -0.4 -1.0 -42.9 214.3 -102.1 214.3 214.3

02/28/2008 18:39:31 0:42:30 -0.4 -1.0 -42.9 214.3 -103.6 214.3 214.3

02/28/2008 18:39:41 0:42:40 -0.4 -1.0 -42.9 214.3 -105.5 214.3 214.3

02/28/2008 18:39:51 0:42:50 -0.4 -1.0 -42.9 214.3 -107.0 214.3 214.3

Data Points 258.0 258.0 258.0

Maximum 2622.2 275.0 280979.8

Minimum -0.4 -1.0 214.3

Average 50.5 11.8 5506.0

4

 REDACTED
Project ID= CITGO

Date= 2/24/2008 THC 1 0-10,000 ppm range

Instrument ID= THC 1 EPA Method 25A Calibration Error Test Results (Direct) 5% limit

THC 1 ID Number= 00101269-33 CEM Absolute Cal Error

Span Value= 10,000 Cylinder ID Certified Conc. Time Response Difference (% of Certified Conc.)

Units= PPMV as C3H8 Ambient Air 0 03:20 -0.40 0.40 NA

Technicians= WL ALM8952-0807 8499 03:13 8491.4 7.6 0.09%

Dilution Ratio= 119.27 ALM29615-0706 4423 03:25 4372.7 50.3 1.14%

ALM46880-0108 2494 03:28 2429.1 64.9 2.60%

Time Dil. Air Press. Orifice Vac.

(psi) ("Hg) THC 1 0-100 ppm range (for linearity)

04:00 38.9 19.8 EPA Method 25A Calibration Error Test Results (Direct) 5% limit04:03 38.9 19.7 CEM Absolute Cal Error04:06 38.9 19.7 Cylinder ID Certified Conc. Time Response Difference (% of Certified Conc.)04:11 39 19.7 Ambient Air 0 03:20 -0.40 0.40 NA

05:04 38.9 19.9 ALM065153 86.7 03:40 82.8 3.9 4.50%

05:53 38.7 19.8 ALM040349 53.4 03:48 53.6 0.2 0.37%05:55 38.7 19.8 ALM012142 26.0 03:49 25.8 0.2 0.77%

THC 1 0-100 ppm rangeEPA Method 25A Calibration Error Test Results (w/ Dilution) 5% limit

CEM Absolute Cal Error

Cylinder ID Certified Conc. Time Response Difference (% of Certified Conc.)

Dilution Air 0 04:34 -0.03 0.03 NA

ALM8952-0807 71.26 04:00 71.90 0.64 0.90%

ALM29615-0706 37.08 04:03 37.77 0.69 1.86%ALM46880-0108 20.91 04:06 20.36 0.55 2.64%

Note: Operator may use either mid or low C3H8 standard for hourly drift checks, per URS SOP-27.EPA Method 25A Calibration Bias and Drift Tests (w/ Dilution)THC 1 5% Limit1 3% Limit

Cal Error Post-Run

CEMS CEMS Cal Error Drift

Run No. Certified Conc. Response Time Response (% of Certified Conc.) (% of Span)2

Run 1 0 -0.03 04:34 -0.40 NA -0.37%

37.08 37.77 04:03 39.40 6.25% 1.63%

1 This QA/QC criteria as part of an hourly drift determination is not required by EPA Method 25A.2 100 ppm span used.

CITGO Coker Steam Vent Testing

THC Calibration Data Summary - Run 1
Project ID= CITGO

Date= 2/26/2008 THC 1 0-10,000 ppm range

Instrument IDs= THC 1, THC 2 EPA Method 25A Calibration Error Test Results (Direct) 5% limit

THC 1 ID Number= 01101396-33 CEM Absolute Cal ErrorTHC 2 ID Number= 00101269-33 Cylinder ID Certified Conc. Time Response Difference (% of Certified Conc.)

Span Value= 10,000 and 100 Ambient Air 0 03:15 0.2 0.2 NA

Units= PPMV as C3H8 ALM8952-0807 8499 03:18 8503.2 4.2 0.05%

Technicians= WL ALM29615-0706 4423 03:20 4338.1 84.9 1.92%

Dilution Ratio= 116.53 ALM46880-0108 2494 03:24 2380.3 113.7 4.56%

Time Dil. Air Press. Orifice Vac. THC 2 0-100 ppm range

(psi) ("Hg) EPA Method 25A Calibration Error Test Results (Direct)2 5% limit

03:42 38.5 20.1 CEM Absolute Cal Error03:46 38.5 20.0 Cylinder ID Certified Conc. Time Response Difference (% of Certified Conc.)03:51 38.5 20.0 Ambient Air 0 03:15 0.05 0.05 NA

03:54 38.4 20.0 ALM065153 89.7 03:31 86.7 3.0 3.37%05:05 38.5 19.6 ALM040349 56.8 03:32 57.2 0.4 0.79%05:51 38.5 19.8 ALM012142 29.7 03:58 27.9 1.8 5.91%05:53 38.5 19.6

THC 2 0-100 ppm rangeEPA Method 25A Calibration Error Test Results (w/ Dilution) 5% limit

CEM Absolute Cal Error

Cylinder ID Certified Conc. Time Response Difference (% of Certified Conc.)

Dilution Air 0 04:01 -0.29 0.29 NA

ALM8952-0807 72.93 03:49 73.38 0.45 0.62%

ALM29615-0706 37.95 03:51 38.25 0.29 0.77%ALM46880-0108 21.40 03:54 21.11 0.29 1.36%

EPA Method 25A Calibration Drift Tests (w/ dilution)THC 2 0-100 ppm range 5% Limit3 3% Limit

Cal Error Post-Run

CEMS CEMS Cal Error Drift

Run No. Certified Conc. Response Time Response (% of Certified Conc.) (% of Span)Run 2 0.00 -0.29 03:15 ---1 NA ---1

37.95 38.25 03:20 36.31 -4.33% -1.94%

EPA Method 25A Calibration Drift Tests (w/ dilution)THC 1 0-10,000 ppm range 5% Limit3 3% Limit

Pre-Run Post-Run

CEMS CEMS Cal Error Drift

Run No. Certified Conc. Response Time Response (% of Certified Conc.) (% of Span)Run 2 0.00 -0.13 03:15 ---1 NA ---1

37.95 36.40 03:32 38.47 1.35% 0.02%

1 Data unavailable.2 This QA/QC procedure as part of calibration with a dilution system is not required by Other Test Method 12.3 This QA/QC criteria as part of an hourly drift determination is not required by EPA Method 25A.

Note: Operator may use either mid or low C3H8 standard for hourly drift checks, per URS SOP-27.

Citgo Coker Steam Vent Testing

THC Calibration Data Summary - Run 2
Project ID= CITGO

Date= 2/27/2008 THC 1 0-10,000 ppm range

Instrument IDs= THC 1, THC 2 EPA Method 25A Calibration Error Test Results (Direct) 5% limit

THC 1 ID Number= 01101396-33 CEM Absolute Cal ErrorTHC 2 ID Number= 00101269-33 Cylinder ID Certified Conc. Time Response Difference (% of Certified Conc.)

Span Value= 10,000 and 100 Ambient Air 0 18:06 0.10 0.10 NA

Units= PPMV as C3H8 ALM8952-0807 8499 18:16 8497.4 1.6 0.02%

Technicians= WL ALM29615-0706 4423 18:18 4469.5 46.5 1.05%

Dilution Ratio= 111.43 ALM46880-0108 2494 18:20 2433.6 60.4 2.42%

Time Dil. Air Press. Orifice Vac. THC 2 0-100 ppm range

(psi) ("Hg) EPA Method 25A Calibration Error Test Results (Direct)1 5% limit

18:39 38.5 20.3 CEM Absolute Cal Error18:45 38.5 20.3 Cylinder ID Certified Conc. Time Response Difference (% of Certified Conc.)18:49 38.5 20.3 Ambient Air 0 18:06 -0.5 0.5 NA

18:51 38.5 20.3 ALM065153 89.7 18:24 89.7 0.0 0.02%18:55 38.5 20.3 ALM040349 56.8 18:27 58.9 2.1 3.66%19:36 38.5 20.3 ALM012142 29.7 18:29 28.6 1.1 3.65%20:22 38.5 20.120:30 38.5 19.7 THC 2 0-100 ppm range

EPA Method 25A Calibration Error Test Results (w/ Dilution) 5% limit

CEM Absolute Cal Error

Cylinder ID Certified Conc. Time Response Difference (% of Certified Conc.)

Dilution Air 0 18:39 0.4 0.4 NA

ALM8952-0807 76.27 18:16 77.0 0.8 1.02%

ALM29615-0706 39.69 18:18 40.1 0.4 0.98%ALM46880-0108 22.38 18:20 21.9 0.4 1.94%

EPA Method 25A Calibration Bias and Drift Tests (w/ Dilution)THC 2 0-100 ppm range 5% Limit2 3% Limit

Cal Error Post-Run

CEMS CEMS Cal Error Drift

Run No. Certified Conc. Response Time Response (% of Certified Conc.) (% of Span)Run 3 0.00 0.37 18:06 -0.46 NA -0.83%

39.69 40.08 18:18 40.96 3.19% 0.88%

EPA Method 25A Calibration Bias and Drift Tests (w/ Dilution)THC 1 0-10,000 ppm range 5% Limit2 3% Limit

Cal Error Post-Run

CEMS CEMS Cal Error Drift

Run No. Certified Conc. Response Time Response (% of Certified Conc.) (% of Span)Run 3 0.00 0.91 18:39 0.17 NA -0.01%

39.69 36.81 18:27 40.01 0.81% 0.03%

1 This QA/QC procedure as part of calibration with a dilution system is not required by Other Test Method 12.2 This QA/QC criteria as part of an hourly drift determination is not required by EPA Method 25A.

Note: Operator may use either mid or low C3H8 standard for hourly drift checks, per URS SOP-27.

CITGO Coker Steam Vent Testing

THC Calibration Data Summary - Run 3
Project ID= CITGO

Date= 2/28/2008 THC 1 0-10,000 ppm range

Instrument IDs= THC 1, THC 2 EPA Method 25A Calibration Error Test Results (Direct) 5% limit

THC 1 ID Number= 01101396-33 CEM Absolute Cal ErrorTHC 2 ID Number= 00101269-33 Cylinder ID Certified Conc. Time Response Difference (% of Certified Conc.)

Span Value= 10,000 and 100 Ambient Air 0 15:59 0.3 0.3 NA

Units= PPMV as C3H8 ALM8952-0807 8499 16:03 8513.9 14.9 0.18%

Technicians= WL ALM29615-0706 4423 16:06 4395.2 27.8 0.63%

Dilution Ratio= 107.15 ALM46880-0108 2494 16:08 2387.9 106.1 4.26%

Time Dil. Air Press. Orifice Vac. THC 2 0-100 ppm range

(psi) ("Hg) EPA Method 25A Calibration Error Test Results (Direct)1 5% limit

16:23 38.3 20 CEM Absolute Cal Error16:26 38.5 20.3 Cylinder ID Certified Conc. Time Response Difference (% of Certified Conc.)16:30 38.5 20.3 Ambient Air 0 15:59 -0.3 0.3 NA

16:32 38.5 20.3 ALM065153 89.7 16:15 89.9 0.2 0.22%

16:37 38.5 20.3 ALM040349 56.8 16:17 59.3 2.5 4.38%17:57 38.5 20.3 ALM012142 29.7 16:18 29.0 0.7 2.44%18:40 38.5 21.018:43 38.5 20.3

THC 2 0-100 ppm rangeEPA Method 25A Calibration Error Test Results (w/ Dilution) 5% limit

CEM Absolute Cal Error

Cylinder ID Certified Conc. Time Response Difference (% of Certified Conc.)

Dilution Air 0.00 16:24 0.5 0.5 NA

ALM8952-0807 79.32 16:28 79.4 0.1 0.07%

ALM29615-0706 41.28 16:30 41.6 0.4 0.86%ALM46880-0108 23.27 16:33 23.1 0.2 0.92%

EPA Method 25A Calibration Bias and Drift Tests (w/ Dilution)

THC 2 0-100 ppm range 5% Limit2 3% Limit

Cal Error Post-Run

CEMS CEMS Cal Error Drift

Run No. Certified Conc. Response Time Response (% of Certified Conc.) (% of Span)Run 4 0.00 0.45 18:47 -0.40 NA -0.85%

41.28 41.63 18:43 44.99 9.01% 3.36%

EPA Method 25A Calibration Bias and Drift Tests (w/ Dilution)

THC 1 0-10,000 ppm range 5% Limit2 3% Limit

Cal Error Post-Run

CEMS CEMS Cal Error Drift

Run No. Certified Conc. Response Time Response (% of Certified Conc.) (% of Span)Run 4 0.00 1.17 18:47 0.19 NA 0.19%

41.28 39.33 18:43 40.13 -2.77% -1.14%

1 This QA/QC procedure as part of calibration with a dilution system is not required by Other Test Method 12.2 This QA/QC criteria as part of an hourly drift determination is not required by EPA Method 25A.

Note: Operator may use either mid or low C3H8 standard for hourly drift checks, per URS SOP-27.

CITGO Coker Steam Vent Testing

THC Calibration Data Summary - Run 4








APPENDIX C 

EPA Method 18 Raw Data 

And Calibration Information 
EPA Method 18 Analytical Narrative 

The methane and ethane concentration data presented in this report vary slightly 

from the raw data submitted to EPA immediately after the February 2008 testing of the 

Coker Steam Vent. These variations were the result of routine data reduction and quality 

assurance procedures associated with the use of a GC/FID and instrument software used 

to perform EPA Method 18. First, the analytical data obtained with the GC/FID was 

reintegrated to reduce the number of non-detects. Second, the methane and ethane 

chromatograph peak areas were re-measured to remove a slightly high bias caused by a 

peak from an unidentified organic compound with a similar retention time. 
CITGO

Coker Steam Vent Testing

URS EPA Method 18

Raw Data

CITGO dilution ratios Run 1 Run 2 Run 3

Coker Steam Vent (DLR) 118.95 116.53 111.43

Methane Ethane

Methane Ethane C1 C2

C1 C2 Average Average

ppm ppm Actual, Actual,

Date/Injection Run x DLR x DLR

02/24/08

14 0.69 0.0 0.7 0.0

x DLR 81.49 0.0 1-1 86.8 0.0

15 0.77 0.0

x DLR 92.14 0.0

16 -- --

x DLR -- --

17 170.15 24.0 169.1 23.8

x DLR 20239.68 2851.9 1-2 20117.3 2833.3

18 167.24 23.6

x DLR 19893.36 2807.5

19 169.98 23.9

x DLR 20218.74 2840.5

20 14.38 1.9 14.1 1.8

x DLR 1710.79 223.4 1-3 1679.8 218.0

21 13.97 1.8

x DLR 1661.25 216.0

22 14.02 1.8

x DLR 1667.34 214.8

Average Average

23 992.21 977.9 994.7 980.6

1000 std, % REC 98.24 97.8 1000 std, % REC 98.5 98.1

24 997.01 983.0

1000 std, % REC 98.71 98.3

25 994.99 981.0

1000 std, % REC 98.51 98.1

4
CITGO

Coker Steam Vent Testing

URS EPA Method 18

Raw Data CITGO dilution ratios Run 1 Run 2 Run 3

Coker Steam Vent (DLR) 118.95 116.53 111.43

Methane Ethane

Methane Ethane C1 C2

C1 C2 Average Average

ppm ppm Actual, Actual,

Date/Injection Run x DLR x DLR

02/26/08

26 978.03 962.6

1000 std, % REC 96.83 96.3

29 4.00 0.5 4.0 0.5

x DLR 466.04 58.1 2-1 468.1 61.0

30 4.04 0.5

x DLR 470.83 63.4

31 4.01 0.5

x DLR 467.53 61.7

32 0.00 0.0 0.0 0.0

x DLR 0.00 0.0 2-2 0.0 0.0

33 0.00 0.0

x DLR 0.00 0.0

40 0.00 0.0

x DLR 0.00 0.0

34 97.46 12.4 97.5 12.8

x DLR 11357.68 1445.2 2-3 11362.7 1496.0

35 97.13 13.0

x DLR 11319.44 1519.7

36 97.92 13.1

x DLR 11410.98 1523.0

Average Average

37 983.81 970.0 983.2 969.2

1000 std, % REC 97.41 97.0 1000 std, % REC 97.3 96.9

38 986.90 972.7

1000 std, % REC 97.71 97.3

39 978.76 965.1

1000 std, % REC 96.91 96.5

4
CITGO

Coker Steam Vent Testing

URS EPA Method 18

Raw Data CITGO dilution ratios Run 1 Run 2 Run 3

Coker Steam Vent (DLR) 118.95 116.53 111.43

Methane Ethane

Methane Ethane C1 C2

C1 C2 Average Average

ppm ppm Actual, Actual,

Date/Injection Run x DLR x DLR

02/27/08 Average Average

41 1000.84 994.9 1003.7 997.8

1000 std, % REC 99.09 99.5 1000 std, % REC 99.4 99.8

42 1004.64 999.0

1000 std, % REC 99.47 99.9

43 1005.57 999.4

1000 std, % REC 99.56 99.9

44 845.4 Average

10% C3 diluted 94207.8 10% C3 diluted 93904.8

45 840.0

10% C3 diluted 93601.7

46 3013.56 373.0 2910.8 364.9

x DLR 335805.39 41564.2 3-1 324359.1 40662.8

47 2907.94 361.0

x DLR 324036.31 40221.7

48 2791.13 347.5

x DLR 311020.54 38720.2

49 2898.04 366.3

x DLR 322933.26 40812.6

50 2922.56 371.3

x DLR 325665.56 41373.3

51 2931.78 370.5

x DLR 326693.23 41285.2

52 1342.51 165.5

x DLR 149597.99 18443.0

53 1305.01 164.2 1289.9 162.1

x DLR 145419.20 18292.0 3-2 145197.8 18158.3

54 1286.72 161.7

x DLR 143381.80 18021.0

55 1277.84 160.4

x DLR 142392.26 17877.3

Average Average

57 991.45 983.3 988.5 980.2

1000 std, % REC 98.16 98.3 1000 std, % REC 97.9 98.0

58 987.34 979.0

1000 std, % REC 97.76 97.9

59 986.77 978.2

1000 std, % REC 97.70 97.8

02/28/08 Average Average

60 989.14 981.2 984.7 976.3

1000 std, % REC 97.93 98.1 1000 std, % REC 97.5 97.6

61 981.87 973.7

1000 std, % REC 97.21 97.4

62 983.04 974.2

1000 std, % REC 97.33 97.4

63 1045.51 1037.0

4
CITGO

Coker Steam Vent Testing

URS EPA Method 18

Raw Data CITGO dilution ratios Run 1 Run 2 Run 3

Coker Steam Vent (DLR) 118.95 116.53 111.43

Methane Ethane

Methane Ethane C1 C2

C1 C2 Average Average

ppm ppm Actual, Actual,

Date/Injection Run x DLR x DLR

0 103.52 103.7

4
CITGO

Coker Steam Vent Testing

URS EPA Method 18

Analytical Summary Sample Analysis Multiple Injection Summary

Methane Ethane

Run Injection 1 (ppmv) Injection 2 (ppmv) Injection 3 (ppmv) Average (ppmv) Standard Deviation %RSD Injection 1 (ppmv) Injection 2 (ppmv) Injection 3 (ppmv) Average (ppmv) Standard Deviation RSD (%)

1-1 81.49 92.14 --1 86.81 7.53 8.67 0.00 0.00 --1 0.00 0.00 N/A1-2 20,239.68 19,893.36 20,218.74 20,117.26 194.19 0.97 2,851.86 2,807.55 2,840.48 2,833.29 23.01 0.811-3 1,710.79 1,661.25 1,667.34 1,679.79 27.02 1.61 223.39 215.98 214.78 218.05 4.67 2.142-1 466.04 470.83 467.53 468.13 2.45 0.52 58.09 63.39 61.67 61.05 2.71 4.432-2 0.00 0.00 0.00 0.00 0.00 N/A 0.00 0.00 0.00 0.00 0.00 N/A2-3 11,357.68 11,319.44 11,410.98 11,362.70 45.97 0.40 1,445.18 1,519.72 1,523.05 1,495.98 44.03 2.94

3-12 335,805.39 324,036.31 311,020.54 323,620.75 12,397.65 3.83 41,564.15 40,221.69 38,720.17 40,168.67 1,422.74 3.54

322,933.26 325,665.56 326,693.23 325,097.35 1,943.32 0.60 40,812.61 41,373.29 41,285.16 41,157.02 301.51 0.73

-- -- -- 324,359.05 7,977.81 2.46 -- -- -- 40,662.85 1,067.28 2.62

3-23 149,597.99 145,419.20 143,381.80 -- -- -- 18,442.97 18,291.97 18,020.97 -- -- --

142,392.26 -- -- 145,197.81 3,192.68 2.20 142,392.26 -- -- 49,287.04 62,070.39 125.94

1 This sample only analyzed in duplicate.2 Six total analyses performed in order to verify the validity of the measurement. As all six injections passed QC criteria, all were used in the determination of the average.3 This analysis performed four times. All analyses passed QC criteria, all were used in the determination of the average.
CITGO

Coker Steam Vent Testing

URS EPA Method 18

Calibration Data

Initial Calibration

Injection

Volume

Injection 1

(RF)

Injection 2

(RF)

Injection 3

(RF) Average

Standard

Deviation %RSD

Methane 600 2686.70 2736.55 2764.65 2729.30 39.48 1.45

1100 2849.14 2862.74 2885.86 2865.91 18.56 0.652100 2981.80 2962.44 2969.93 2971.39 9.76 0.33

Ethane 600 1453.04 1481.74 1496.85 1477.21 22.25 1.51

1100 1546.16 1555.21 1568.02 1556.46 10.98 0.71

2100 1624.32 1614.45 1619.18 1619.32 4.94 0.31

Propane 600 977.40 998.47 1006.96 994.28 15.22 1.53

1100 1045.40 1049.20 1059.25 1051.28 7.16 0.68

2100 1105.28 1099.27 1103.12 1102.56 3.04 0.28

Calibration Verification

Date

Injection 1 

(RF)

Injection 2 

(RF)

Injection 3 

(RF) Average

Standard

Deviation %RSD

Deviation

from Initial 

(%)

Methane 2/24/2008 Initial 1010.00 1010.00 1010.00 1010.00 0.00 0.00 0.00

Final 992.21 997.01 994.99 994.74 2.41 0.00 1.51

2/26/2008 Initial 978.03 --1 --1 978.03 NA NA 3.17

Final 983.81 986.90 978.76 983.15 4.11 0.00 2.66

2/27/2008 Initial 1000.84 1004.64 1005.57 1003.69 2.51 0.00 0.63

Final 991.45 987.34 986.77 988.52 2.55 0.00 2.13

Ethane 2/24/2008 Initial 1000.00 1000.00 1000.00 1000.00 0.00 0.00 0.99

Final 977.89 983.03 980.97 980.63 2.59 0.00 2.91

2/26/2008 Initial 962.57 --1 --1 962.57 NA NA 4.70

Final 969.95 972.70 965.10 969.25 3.85 0.00 4.03

2/27/2008 Initial 994.91 999.03 999.41 997.78 2.49 0.00 1.21

Final 983.26 979.03 978.24 980.18 2.70 0.00 2.95

Propane 2/24/2008 Initial 1000.00 1000.00 1000.00 1000.00 0.00 0.00 0.99

Final 977.94 980.78 980.00 979.57 1.47 0.00 3.01

2/26/2008 Initial 960.50 --1 --1 960.50 NA NA 4.90

Final 968.93 971.54 964.82 968.43 3.39 0.00 4.12

2/27/2008 Initial --2 1001.06 1001.21 1001.14 0.11 0.00 0.88

Final 984.97 981.23 979.88 982.03 2.64 0.00 2.77

1 Only a single injection performed presampling.2 First chromatogram stopped early, before propane was integrated.
Citgo

Coker Steam Vent Testing

URS EPA Method 18

Recovery Study

Cylinder

Concentration

(ppmv propane)

Measured

Concentration

(ppmv propane)

Dilution

Factor

Actual

Concentration

(ppmv propane)

% Recovery

Injection 1 100000 845.43 111.43 94208 94.2

Injection 2 100000 839.99 111.43 93602 93.6

Average 100000 842.71 111.43 93905 93.9

Note: Recovery study/audit samples NOT per Method 18. This is also a check of the dilution system.

10% propane was introduced at the probe through the dilution system and then to the bag. The gas 

was retained in the bag the same duration as samples. Bag was only analyzed in duplicate, not 

triplicate per method. Methane and ethane were not spiked.








































APPENDIX D 

EPA Method 2/4 Raw Data 

And Calibration Information 








Calculation Summary

Location Coker A-1 Coker A-1 Coker A-1 Coker A

Parameter M2/ M4 M2/ M4 M2/ M4 M2/ M4

Run Designation Run 1 Run 2 Run 3 Run 4

Date 2/24/2008 2/26/2008 2/27/2008 2/28/2008

Time Start 05:04 05:05 19:36 17:57

Time Stop 05:24 05:47 20:08 18:05

05:04-05:24 05:05-05:47 19:36-20:08 17:57-18:05

Duct Diameter (ft) (equivalent if square duct) 1.00 1.00 1.00 1.00

Pitot Tube Correction Factor 0.84 0.84 0.84 0.84

Nozzle Diameter (inches) 0.540 0.540 0.540 0.540

DGMCF 1.051 1.037 1.031 1.028

Standard Temperature (°F) 68 68 68 68

Barometric Pressure Measured (" Hg) 30.22 30.24 30.25 30.18

Stack Elevation (ft) (relative to Barometer) 000 0

Barometric Pressure (" Hg) 30.22 30.24 30.25 30.18

Average Stack Temperature (°F) 213.0 220.1 220.3 213.0 216.6

Average DGM Temp (°F) 82.5 75.1 66.0 73.6

Average Delta H (in wc) 0.19 0.19 0.19 0.16

Condensed Water (g) 2574.8 2112.4 1770.5 1546.3 2001.0

Test Duration (minutes) 20 42 32 8

Static Pressure (in wc) -1.36 -1.36 -1.36 -1.36

Meter Volume (acf) 2.078 8.983 7.507 0.967

Average square root of delta p 3.122 1.373 1.481 3.012

Absolute Stack Pressure (in Hg) 30.12 30.14 30.15 30.08

Absolute Stack Temperature (°R) 673.0 680.1 680.3 673.0 676.6

Flue Gas Moisture (%) 98.26 91.48 91.4 98.66 95.0

Moisture at saturation N/A N/A N/A N/A

Moisture used in Calculation 98.26 91.48 91.41 98.66 95.0

Gas Molecular Weight (Wet) (g/g-mole) 18.15 18.89 20.05 18.23

Corrected Volume of Gas sampled (acf) 2.183 9.315 7.740 0.994

Volume at Meter (dscf) 2.147 9.295 7.859 0.993 5.073

Average Gas Velocity (f/sec) 249 108 113 240 177

Avg Flow Rate (acfh) 703,205 304,713 319,068 677,516 501,126

Avg Flow Rate (acfm) 11,720 5,079 5,318 11,292 8,352

Avg Flow Rate (scfh) 555,427 238,298 249,561 534,354 394,410

Avg Flow Rate (scfm) 9,257 3,972 4,159 8,906 6,573

Avg Flow Rate (dscfh) 9,639 20,311 21,441 7,166 14,639

Avg Flow Rate (dscfm) 161 339 357 119 244

Isokinetic Sampling Rate (%) 33.01 32.29 33.94 51.30

Sample Flow Rate (cfm) 0.106 0.214 0.235 0.121 0.17

Sample Flow Rate (L/min) 2.992 6.056 6.643 3.423 4.78

CITGO Coker A Testing

Averages

05:04 05:05 19:36 17:57

05:24 05:47 20:08 18:05

05:04-05:24 05:05-05:47 19:36-20:08 17:57-18:05

68 68 68 68

30.22 30.24 30.25 30.18

30.22 30.24 30.25 30.18

213.0 220.1 220.3 213.0 216.6

82.5 75.1 66.0 73.6

0.19 0.19 0.19 0.16

20 42 32 8

-1.36 -1.36 -1.36 -1.36

3.122 1.373 1.481 3.012

30.12 30.14 30.15 30.08

673.0 680.1 680.3 673.0 676.6

 REDACTED
Calculation Summary

Location Coker A-1 68

Parameter M2/ M4 30.22 mdd

24-Feb 0 dcw

1 -1.36 dcw

0.84

0.54

1.051

start 05:04 start 53.097 Final Initial

stop 05:24 stop 55.210 1 2066.5 1057.3

start start 2 1433.3 1427.0

stop stop 3 1380.2 1378.6

start start 4 947.5 946.4

stop stop 5 1040.1 1038.9

start start 6 923.8 922.0

stop stop 7 923.8 921.7

start start 8 951.1 949.2

stop stop 9 890.2 889.4

start start 16-17, SB 3553.3 2010.4

stop stop

2574.8

Duration 20 Total 2.113

Delta P Delta H Stack Temp DGM In DGM Out av sqrt dP

Averages 10.75 0.19 213.0 3.1217

Interval

Individual 29.5 0.2 212 83 82 5.43139 1

Readings 24.5 0.2 213 83 82 4.949747

24.5 0.2 213 83 82 4.949747

20.5 0.2 213 83 82 4.527693

17.0 0.2 213 83 82 4.123106

14.5 0.2 213 83 82 3.807887

11.0 0.2 213 83 82 3.316625 2

10.0 0.19 213 83 82 3.162278

8.0 0.19 213 83 82 2.828427

7.5 0.19 213 83 82 2.738613

7.0 0.12 213 83 82 2.645751

6.5 213 2.54951

6.0 213 2.44949 3

Run 1

Nozzle Diameter (in)

Std Temp (F)

Duct Diamter (ft)

Duct Depth (ft)

Duct Width (ft)

Pitot Tube Correction Factor

Bar Press ("Hg, meas)

Data Entry Area

Static Press ("wc)

DGMCF

Stk Elev (rel to Barometer)

Times Impinger Catch DGM Volumes (as read)

Date

Data Entered By (initials)

Data Checked by (initials)

Data Corrected by (initials)

Total Wt Gain

82.5

05:04

05:24

68

30.22

-1.36

10.75 0.19 213.0 3.1217

29.5 0.2 212 5.43139

24.5 0.2 213 4.949747

24.5 0.2 213 4.949747

20.5 0.2 213 4.527693

17.0 0.2 213 4.123106

14.5 0.2 213 3.807887

11.0 0.2 213 3.316625

10.0 0.19 213 3.162278

8.0 0.19 213 2.828427

7.5 0.19 213 2.738613

7.0 0.12 213 2.645751

6.5 213 2.54951

6.0 213 2.44949

20

 REDACTED
Calculation Summary

6.0 213 2.44949

6.0 213 2.44949

5.0 213 2.236068

5.0 213 2.236068

6.0 213 2.44949

5.0 213 2.236068

5.5 213 2.345208

6.0 213 2.44949

5.5 213 2.345208

0 213 2.44949

6.0 213 2.44949

5.0 213 2.236068

5.0 213 2.236068

6.0 213 2.44949

5.0 213 2.236068

5.5 213 2.345208

6.0 213 2.44949

5.5 213 2.345208

 REDACTED
Calculation Summary

Location Coker A-1 68

Parameter M2/ M4 30.24 mdd

26-Feb 0 dcw

1 -1.36 dcw

0.84

0.54

1.037

start 05:05 start 61.307 Final Initial

stop 05:47 stop 70.290 1 2248.4 1040.1

start start 2 1620.9 1433.3

stop stop 3 1192.4 1380.2

start start 4 947.9 947.5

stop stop 5 890.3 890.2

start start 6 923.1 923.8

stop stop 7 922.2 923.8

start start 8 950.0 951.1

stop stop 9 974.5 950.9

start start

stop stop

2112.4

Duration 42 Total 8.983

Delta P Delta H Stack Temp DGM In DGM Out av sqrt dP

Averages 2.44 0.19 220 1.3733

Interval

Individual 15.0 0.19 213 76 75 3.872983 1

Readings 10.0 0.19 213 76 76 3.162278

6.5 0.19 213 76 76 2.54951

3.5 0.19 213 76 76 1.870829

2.0 0.19 213 76 76 1.414214

2.0 0.19 213 76 76 1.414214

1.5 0.2 219 76 76 1.224745

1.0 0.19 222 76 76 1

1.0 0.19 222 75 76 1 2

1.0 0.2 223 75 75 1

1.0 0.19 224 75 75 1

1.0 0.2 223 75 75 1

1.0 0.2 224 75 75 1

Run 2

Std Temp (F)

Date

Static Press ("wc)

Duct Depth (ft)

Data Entry Area

Bar Press ("Hg, meas)

Duct Diamter (ft)

Duct Width (ft)

Pitot Tube Correction Factor

Nozzle Diameter (in)

DGMCF

Stk Elev (rel to Barometer)

Data Entered By (initials)

Data Checked by (initials)

Data Corrected by (initials)

Times DGM Volumes (as read) Impinger Catch

Total Wt Gain

75.1

68

30.24

-1.36

05:05 61.307

05:47 70.290

42

2.44 0.19 220 1.3733

15.0 0.19 213 3.872983

10.0 0.19 213 3.162278

6.5 0.19 213 2.54951

3.5 0.19 213 1.870829

2.0 0.19 213 1.414214

2.0 0.19 213 1.414214

1.5 0.2 219 1.224745

1.0 0.19 222 1

1.0 0.19 222 1

1.0 0.2 223 1

1.0 0.19 224

1.0 0.2 223

1

1

1.0 0.2 224 1

 REDACTED
Calculation Summary

1.0 0.19 224 75 75 1

1.0 0.2 224 75 75 1

1.0 0.2 224 75 74 1 3

1.0 0.2 224 74 75 1

1.0 0.19 223 74 74 1

1.0 0.19 223 74 74 1

1.0 0.19 223 74 74 1

1.0 0.2 222 74 74 1

1.0 0.16 223 73 74 1

1.5 219 1.224745

1.5 219 1.224745

1.0 0.19 224 1

1.0 0.2 224 1

1.0 0.2 224 1

1.0 0.2 224 1

1.0 0.19 223 1

1.0 0.19 223 1

1.0 0.19 223

1.0 0.2 222

1

1

1.0 0.16 223 1

1.5 219 1.224745

1.5 219 1.224745

 REDACTED
Calculation Summary

Location Coker A-1 68

Parameter M2/ M4 30.25 mdd

27-Feb 0 dcw

1 -1.357 dcw

0.84

0.54

1.031

start 19:36 start 76.073 Final Initial

stop 20:08 stop 83.580 1 1607.2 1053.9

start start 2 1622.6 1620.9

stop stop 3 1192.5 1192.4

start start 4 947.4 947.9

stop stop 5 890 890.3

start start 6 922.4 923.1

stop stop 7 921.7 922.2

start start 8 949.8 950.0

stop stop 9 944.8 936.4

start start

stop stop

1770.5

Duration 32 Total 7.507

Delta P Delta H Stack Temp DGM In DGM Out av sqrt dP

Averages 2.54 0.19 220 1.4813

Interval

Individual 0.5 0.20 210 66 67 0.707107 1

Readings 0.5 0.19 222 66 67 0.707107

0.5 0.19 223 65 66 0.707107

1.0 0.20 225 67 67 1

1.0 0.21 230 65 65 1

1.0 0.19 230 65 65 1

1.0 0.20 225 66 65 1

1.0 0.21 224 66 67 1

1.0 0.20 220 66 69 1 2

1.5 0.20 226 70 70 1.224745

1.0 0.20 221 64 66 1

1.5 0.20 218 64 67 1.224745

2.0 0.20 221 68 68 1.414214

Run 3 

Data Checked by (initials)

Data Corrected by (initials)

Nozzle Diameter (in)

Duct Depth (ft)

Bar Press ("Hg, meas)

Static Press ("wc)

Date Stk Elev (rel to Barometer)

Duct Diamter (ft)

Pitot Tube Correction Factor

Duct Width (ft)

Data Entry Area

Std Temp (F)

Data Entered By (initials)

Times

Total Wt Gain

DGM Volumes (as read) Impinger Catch

66.0

DGMCF

68

30.25

-1.357

19:36

20:08

32

2.54 0.19 220 1.4813

0.5 0.20 210 0.707107

0.5 0.19 222 0.707107

0.5 0.19 223 0.707107

1.0 0.20 225 1

1.0 0.21 230 1

1.0 0.19 230 1

1.0 0.20 225 1

1.0 0.21 224 1

1.0 0.20 220 1

1.5 0.20 226 1.224745

1.0 0.20 1

1.5 0.20 218

221

1.224745

2.0 0.20 221

Data Entry Area

Run 3

t y

Std Temp (F)

Bar Press ("Hg, meas) Data Entered By (initials)

Date Stk Elev (rel to Barometer) Data Checked by (initials)

Duct Diamter (ft) Static Press ("wc) Data Corrected by (initials)

Duct Depth (ft)

Duct Width (ft)

Pitot Tube Correction Factor

Nozzle Diameter (in)

DGMCF

Times DGM Volumes (as read) Impinger Catch

Total Wt Gain

1.414214

 REDACTED
Calculation Summary

2.0 0.20 223 65 65 1.414214

2.5 0.20 214 63 63 1.581139

3.0 0.20 214 64 64 1.732051 3

4.0 0.05 221 2

4.0 215 2

4.5 218 2.12132

5.0 221 2.236068

5.0 216 2.236068

5.5 216 2.345208

6.0 218 2.44949

6.0 215 2.44949

2.0 0.20 223 1.414214

2.5 0.20 214 9

3.0 0.20 214 1.732051

4.0 0.05 221 2

4.0 215 2

4.5 218 2.12132

5.0 221 2.236068

5.0 216 2.236068

5.5 216 2.345208

6.0 218 2.44949

6.0 215 2.44949

 REDACTED
Calculation Summary

Location Coker A 68

Parameter M2/ M4 30.18 mdd

28-Feb 0 dcw

1 -1.36 dcw

0.84

0.54

1.028

start 17:57 start 628.343 Final Initial

stop 18:05 stop 629.310 1 2585.3 1044.4

start start 2 1630.3 1622.6

stop stop 3 1185.9 1192.5

start start 4 947.1 947.4

stop stop 5 890.8 890

start start 6 922.3 922.4

stop stop 7 922 921.7

start start 8 949.8 949.8

stop stop 9 928.8 925.2

start start

stop stop

1546.3

Duration 8 Total 0.967

Delta P Delta H Stack Temp DGM In DGM Out av sqrt dP

Averages 9.50 0.16 213 3.0117

Interval

Individual 26.5 0.20 214 74 73 5.147815 1

Readings 19.0 0.20 215 75 74 4.358899

17.0 0.20 213 74 73 4.123106

11.0 0.20 213 73 74 3.316625

8.5 0.02 213 73 73 2.915476

8.0 213 2.828427

8.0 213 2.828427

7.5 213 2.738613

6.5 212 2.54951 2

6.5 213 2.54951

6.5 213 2.54951

6.0 213 2.44949

6.5 213 2.54951

Run 4

Duct Depth (ft)

Pitot Tube Correction Factor

Duct Width (ft)

Data Entered By (initials)

Std Temp (F)

Data Entry Area

Impinger Catch

Total Wt Gain

Data Checked by (initials)

Data Corrected by (initials)

Nozzle Diameter (in)

Times DGM Volumes (as read)

73.6

Date

Static Press ("wc)

Bar Press ("Hg, meas)

Stk Elev (rel to Barometer)

Duct Diamter (ft)

DGMCF

17:57

18:05

-1.36

30.18

68

8

9.50 0.16 213 3.0117

26.5 0.20 214 5.147815

19.0 0.20 215 4.358899

17.0 0.20 213 4.123106

11.0 0.20 213 3.316625

8.5 0.02 213 2.915476

8.0 213 2.828427

8.0 213 2.828427

7.5 213 2.738613

6.5 212 2.54951

6.5 213 2.54951

6.5 213 2.54951

6.0 213 2.44949

6.5 213 2.54951

 REDACTED
Calculation Summary

7.0 213 2.645751

7.5 212 2.738613

7.5 213 2.738613 3

8.0 213 2.828427

8.0 213 2.828427

8.0 213 2.828427

8.0 213 2.828427

8.5 213 2.915476

9.0 213 3

7.0 213 2.645751

7.5 212 2.738613

7.5 213 2.738613

8.0 213 2.828427

8.0 213 2.828427

8.0 213 2.828427

8.0 213 2.828427

8.5 213 2.915476

9.0 213 3

 REDACTED
Example Calculation, Run 1 Page 1

Pbar =

= 30.22

= 0

= 30.22

0 X 0.1

Pbar = 30.22

= 30.22

= -1.4

= 30.12

-1.4

13.6

Ps = 30.12

Vw(std) =

= 2574.8 g

= 0.0022046 lb/g

= 21.85 inHg - ft3

/degR - lbmole

= 528 degR

= 18.00 lb/lbmole

= 29.92 inHg

Vw(std) = 2574.8 x 0.002205 x 21.85 x 528

18 x 29.92

Vw(std) = 121.597

Pbar,meas - (Elev X 0.1/100)

V1c = Total weight of liquid collected 

K=conversion of grams to pounds

R = Ideal Gas Constant

Tstd = Standard absolute temperature

Volume of Water Vapor Condensed, corrected to standard conditions, ft3 - as per US EPA Method 5, Eq. 5-2

in. Hg

Ps = 30.22 + (

Pbar = Barometric pressure at the sampling site

in. Water

Ps = Absolute Stack Pressure in. Hg

)

Barometric Pressure at the Sampling Location, Corrected per EPA Method 2, Section 6.5

Barometric Pressure at the Sampling Location, Corrected per EPA Method 2, Section 6.5

Pg = Stack Static Pressure

in. Hg

feet

in. Hg

100 )

Pbar,meas = Barometric pressure as measured

Elev = elevation of sampling location relative to barometer

Pbar = Barometric pressure at the sampling site

Pbar = 30.22 - (

Mw = Molecular Weight of Water

Pstd = Standard absolute pressure

Adapted for the measurement of mass of water as opposed to the volume of water.

Mw x Pstd

V1c x K x R x Tstd

30.22

30.22

30.22

30.22

30.22

-1.4

30.12

30.22

30.12

 REDACTED
Example Calculation, Run 1 Page 2

Moisture Content, proportion, by volume - as per US EPA Method 5, Eq. 5-3

= 121.597 ft3

= 2.147 ft3

2.147 + 121.597

Bws = 0.9826

Moisture content at saturation

Bws = N/A

= 86.7

X 673.0 = -434.4

X 452867.82 = 822.1

X 304759458 = -697.4

X 2.051E+11 = 224.0

sum = 1.0190

29.92

30.12

for further calculations

Bws = 0.9826

Vw(std) = Volume of water vapor condensed

Vm(std) = Dry Gas Volume

Vw(std)

Vm(std) + Vw(std)

This calculated by polynomial fit: (86.7222826792858 + Ts*(-0.645483277572566) + 

Ts

2

*0.00181527101645074 + Ts

3

 * (-2.28823297043421E-06) + (Ts)

4

*1.09201445204276E09)*100*29.92/Ps)

x 100

1.09201445204276E-09

86.722282679285800

-0.645483277572566

Bws =

Bws =

121.597

sum x = 101.22

0.00181527101645074

-2.28823297043421E-06
Example Calculation, Run 1 Page 3

Molecular Weight of stack gas, lb/lb-mole - as per US EPA Method 2, Eq. 2-6

Ms =

= 26.73 lb/lb-mole

= 0.983 proportion

= 18.00 lb/lb-mole

Ms = 26.73 x ( 1 - 0.983 ) + ( 18.00 x 0.983 )

Ms = 18.15

Vm(actual) = Vm x Y

= 2.078 ft3

= 1.051

Vm(actual) = 2.078 x 1.051

Vm(actual) = 2.18

= 2.078 ft3

= 1.051

= 528

= 30.22 in. Hg

= 0.19 in. H2O

13.6 in. H2O/in. Hg

542.50 degR

Vm(std) = 2.078 x 1.051 x 528 x ( 30.22 + ( 0.19 / 13.6 ))

542.5 x 29.92

Vm(std) = 2.147

Vm(std) =

13.6 = Conversion factor

Tm = Absolute average DGM temperature

Vm = Volume of gas sample, dry

Y = Dry gas meter calibration factor 

Vm = Volume of gas sample, dry

Y = Dry gas meter calibration factor 

Dry Gas Volume, corrected to standard conditions, ft3 - as per US EPA Method 5, Eq. 5-1

Tm x Pstd

Md (1-Bws)+18.0(Bws)

 Vm x Y x Tstd x (Pbar + (deltaH / 13.6))

Dry Gas Volume, corrected to actual conditions, ft3

Tstd = Standard Temperature

Pbar = Barometric pressure at the sampling site

deltaH = Average pressure differential across the orifice meter 

18.0 = Molecular Weight of H2O

Md= Dry molecular weight of stack gas

Bws= Proportion of water vapor, by volume

30.22

0.19

30.22 0.19

 REDACTED
Example Calculation, Run 1 Page 4

vs = Kp x Cp x deltaPavg x sqrt(Ts/(Ps x Ms))

= 85.49 ft/sec[((lb/lb-mole)(in.Hg))/((degR)(in.H2O))]1⁄2

= 0.84

= 3.12 in.H2O

= 673.0 degR

= 30.12 in. Hg

= 18.15 lb/lb-mole

30.12 x 18.15

vs = 248.71 ft/sec

Average Stack Gas Volumetric Flow Rate - Actual Conditions

Qactual = vs X A

= 248.71 ft/sec

= 0.79 ft2

Qactual = 248.71 x 0.79

Qactual = 195 cubic feet per second

Qactual = 11720 cubic feet per minute

Qactual = 703205 cubic feet per hour

Q = 3600 x (1-Bws) x vs x A x Tstd x Ps

Ts x Pstd

= 3600 sec/hr

= 0.983 proportion

= 248.71 ft/sec

= 0.79 ft2

= 528 degR

= 30.12 in. Hg

= 673.0 degR

= 29.92 in. Hg

673.0

A = Cross sectional area of stack 

3600= Conversion factor

Bws = Proportion of water vapor, by volume

vs= Average stack gas velocity

Tstd = Standard absolute temperature

Ps = Absolute stack pressure

Ts = Absolute stack temperature

vs= Average stack gas velocity

Average Stack Gas Velocity, ft/sec - as per US EPA Method 2, Eq. 2-7

Pstd = Standard absolute pressure

Average Stack Gas Dry Volumetric Flow Rate, dscf/hr - as per US EPA Method 2, Eq. 2-8

A = Cross sectional area of stack 

Cp = S type pitot tube coefficient

deltaPavg=ave. sqrt. of the velocity head of stack gas

Ts = Absolute stack temperature 

Kp= Velocity equation constant

3.12 x (

Ps = Absolute stack pressure

Ms = Molecular Weight of stack gas

vs = 85.49 x 0.84 x )

0.5

673.0

30.12

673.0

30.12

 REDACTED
Example Calculation, Run 1 Page 5

Average Stack Gas Wet Volumetric Flow Rate, wscf/hr

Qw = Q

(1-Bws)

= 9,639 dscf/hr

= 0.983 proportion

Qw =

( 1.00 - 0.983 )

Qw = 555,427 wscf/hr

= 9,257 wscf/min

Isokinetic Variation, % - as per US EPA Method 5, Eq. 5-8

100 x Ts x Vm(std) x Pstd

60 x Tstd x Ps x vs x An x min x (1 - Bws)

= 100

= 673 degR

= 2.147 ft3

= 29.920 in. Hg

= 60 Sec/Min

= 528 degR

= 30.12 in. Hg

= 248.71 ft/sec

= 0.0015904 ft2

= 20 minutes

= 0.983 proportion

100 x 673.0 x 2.147 x 29.92

60 x 528 x 30.12 x 248.71 x 0.0015904 x 20 x ( 1 - 0.983

I = 33.01

Bws = Proportion of water vapor, by volume

Q = Average Stack Gas Dry Volumetric Flow Rate

I =

An = Cross-sectional Area of nozzle

min = Total sampling time

Bws = Proportion of water vapor, by volume

I =

60 = Sec/Min

Tstd = Standard absolute temperature

Ps = Absolute stack pressure

vs = Average stack gas velocity

100 = Conversion to Percent

Ts = Absolute stack temperature

Vm(std) = Dry Gas Volume

Pstd = Standard absolute pressure

9,639
CITGO

Coker Steam Vent Testing

URS EPA Method 2/4

Data Reduction per Interval

Run 1 Interval 1 Interval 2 Interval 3

Duration (min): 15 15 19

Barometric ("Hg): 30.22 30.22 30.22

Duct Diameter (ft): 1.00 1.00 1.00

PTCF: 0.84 0.84 0.84

Vent Temp. (deg F): 212.8 213.0 213.0

Delta H ("H2O): 0.2 0.18 n/a

Static ("H2O): -1.36 -1.36 -1.36

Delta P ("H2O): 21.8 8.3 5.6

SQRT Delta P: 4.63 2.87 2.36

Abs. Vent Pressure ("Hg): 30.12 30.12 30.12

Abs. Vent Temp. ( R): 672.8 673.0 673.0

Moisture (%): 98.26 98.26 98.26

Molecular Weight (g/mol): 18.15 18.15 18.15

Velocity (ft/sec): 369 229 188

Vent Gas Flowrate (acfh): 1,043,244 647,330 532,682

Vent Gas Flowrate (acfm): 17,387 10,789 8,878

Vent Gas Flowrate (scfh): 824,155 511,259 420,711

Vent Gas Flowrate (scfm): 13,736 8,521 7,012

Vent Gas Flowrate (dscfh): 14,302 8,872 7,301

Vent Gas Flowrate (dscfm): 238 148 122

30.22 30.22 30.22

15 15 19

212.8 213.0 213.0

-1.36 -1.36 -1.36

0.2 0.18 n/a

21.8 8.3 5.6

4.63 2.87 2.36

672.8 673.0 673.0

30.12 30.12 30.12

 REDACTED
CITGO

Coker Steam Vent Testing

URS EPA Method 2/4

Data Reduction per Interval

Run 2 Interval 1 Interval 2 Interval 3

Duration (min): 15 15 16

Barometric ("Hg): 30.24 30.24 30.24

Duct Diameter (ft): 1.00 1.00 1.00

PTCF: 0.84 0.84 0.84

Vent Temp. (deg F): 214.9 223.4 222.2

Delta H ("H2O): 0.19 0.20 0.19

Static ("H2O): -1.36 -1.36 -1.36

Delta P ("H2O): 5.19 1.00 1.11

SQRT Delta P: 2.06 1.00 1.05

Abs. Vent Pressure ("Hg): 30.14 30.14 30.14

Abs. Vent Temp. ( R): 674.9 683.4 682.2

Moisture (%): 91.48 91.48 91.48

Molecular Weight (g/mol): 18.89 18.89 18.89

Velocity (ft/sec): 161 79 83

Vent Gas Flowrate (acfh): 456,121 222,428 233,331

Vent Gas Flowrate (acfm): 7,602 3,707 3,889

Vent Gas Flowrate (scfh): 359,481 173,107 181,914

Vent Gas Flowrate (scfm): 5,991 2,885 3,032

Vent Gas Flowrate (dscfh): 30,639 14,754 15,505

Vent Gas Flowrate (dscfm): 511 246 258

30.24 30.24 30.24

15 15 16

214.9 223.4 222.2

0.19 0.20 0.19

-1.36 -1.36 -1.36

2.06 1.00 1.05

5.19 1.00 1.11

674.9 683.4 682.2

30.14 30.14 30.14

 REDACTED
CITGO

Coker Steam Vent Testing

URS EPA Method 2/4

Data Reduction per Interval

Run 3 Interval 1 Interval 2 Interval 3

Duration (min): 15 15 16

Barometric ("Hg): 30.25 30.25 30.25

Duct Diameter (ft): 1.00 1.00 1.00

PTCF: 0.84 0.84 0.84

Vent Temp. (deg F): 223.6 220.4 217.1

Delta H ("H2O): 0.20 0.20 0.13

Static ("H2O): -1.36 -1.36 -1.36

Delta P ("H2O): 0.81 1.64 4.78

SQRT Delta P: 0.89 1.27 2.17

Abs. Vent Pressure ("Hg): 30.15 30.15 30.15

Abs. Vent Temp. ( R): 683.6 680.4 677.1

Moisture (%): 91.41 91.41 91.41

Molecular Weight (g/mol): 20.05 20.05 20.05

Velocity (ft/sec): 68 96 165

Vent Gas Flowrate (acfh): 192,220 272,647 467,295

Vent Gas Flowrate (acfm): 3,204 4,544 7,788

Vent Gas Flowrate (scfh): 149,604 213,197 367,193

Vent Gas Flowrate (scfm): 2,493 3,553 6,120

Vent Gas Flowrate (dscfh): 12,853 18,317 31,548

Vent Gas Flowrate (dscfm): 214 305 526

30.25 30.25 30.25

15 15 16

223.6 220.4 217.1

6 -1.36

0.20 0.20 0.13

-1.36 -1.36

0.81 1.64 4.78

30.15 30.15 30.15

0.89 1.27 2.17

683.6 680.4 677.1

 REDACTED
CITGO

Coker Steam Vent Testing

URS EPA Method 2/4

Data Reduction per Interval

Run 4 Interval 1 Interval 2 Interval 3

Duration (min): 15 15 13

Barometric ("Hg): 30.18 30.18 30.18

Duct Diameter (ft): 1.00 1.00 1.00

PTCF: 0.84 0.84 0.84

Vent Temp. (deg F): 213.4 212.7 213.0

Delta H ("H2O): 0.16 n/a n/a

Static ("H2O): -1.36 -1.36 -1.36

Delta P ("H2O): 13.19 6.64 8.14

SQRT Delta P: 3.53 2.58 2.85

Abs. Vent Pressure ("Hg): 30.08 30.08 30.08

Abs. Vent Temp. ( R): 673.4 672.7 673.0

Moisture (%): 98.66 98.66 98.66

Molecular Weight (g/mol): 18.23 18.23 18.23

Velocity (ft/sec): 281 205 227

Vent Gas Flowrate (acfh): 794,801 579,358 641,694

Vent Gas Flowrate (acfm): 13,247 9,656 10,695

Vent Gas Flowrate (scfh): 626,549 457,161 506,134

Vent Gas Flowrate (scfm): 10,442 7,619 8,436

Vent Gas Flowrate (dscfh): 8,402 6,131 6,787

Vent Gas Flowrate (dscfm): 140 102 113

15 15 13

30.18 30.18 30.18

213.4 212.7 213.0

0.16 n/a n/a

-1.36 -1.36 -1.36

13.19 6.64 8.14

3.53 2.58 2.85

30.08 30.08 30.08

673.4 672.7 673.0

 REDACTED
CITGO

Coker Steam Vent Testing

URS EPA Method 2/4

Sampling and Leak Rate Data

Leak Correction per equation EPA Method 5-1 (a) Case I:

Run 1

meter volume (acf) 2.113

4% of average sampling rate (cfm) 0.0042

final leak rate (cfm) 0.006

final leak rate - 4% of avg. sampling rate (cfm) 0.0018

leak volume (acf) 0.035

corrected meter volume (acf) 2.078

Run 2

meter volume (acf) 8.983

4% of average sampling rate (cfm) 0.0086

final leak rate (cfm)1 0.002

final leak rate - 4% of avg. sampling rate (cfm) n/a

leak volume (acf) n/a

corrected meter volume (acf) 8.983

Run 3

meter volume (acf) 7.507

4% of average sampling rate (cfm) 0.0094

final leak rate (cfm) 0.006

final leak rate - 4% of avg. sampling rate (cfm) n/a

leak volume (acf) n/a

corrected meter volume (acf) 7.507

Run 4

meter volume (acf) 0.967

4% of average sampling rate (cfm) 0.0048

final leak rate (cfm) 0.004

final leak rate - 4% of avg. sampling rate (cfm) n/a

leak volume (acf) n/a

corrected meter volume (acf) 0.967

1

 Only initial leak rate available



Console ID Ambient Temperature (oF)

DryCal ID Barometric Pressure (in. Hg)

Initials mdd Initials

Date 3/12/2008 Date

Run 1A Run 1B Run 2A Run 2B Run 3A Run 3B Run 4A Run 4B Run 5A Run 5B

0.25 0.25

15:59 16:04

174.93 176.18

16:04 16:09

176.18 177.42

5500000000

1.245 1.239 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000

0.25199 0.254170.25228 0.25401

0.2523 0.25416

0.25252 0.254210.25273 0.254270.25284 0.254240.25318 0.254310.25337 0.254530.25359 0.254750.25361 0.254770.25376 0.254790.24972 0.254890.25396 0.255070.25394 0.254970.25414 0.255

0.253 0.255 #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0!1.265 1.273 #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0!1.016 1.027 #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0!

1 Each DryCal reading recorded is average of 10 instantaneous readings.2 Run average Yd is acceptable if the individual Yds are within 2% of the average and if the average Yd is between 0.9 and 1.1.

Dry Gas Meter Calibration (vs. DryCal)

1.021 #DIV/0! #DIV/0!

Vcon--Total Volume (ft3)

A183521

111813

68.4

29.26

Calibrated by Reviewed by

#DIV/0!

#DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0!

#DIV/0! #DIV/0!

Nominal Flowrate (ft3/min)

#DIV/0! #DIV/0! #DIV/0!

Average Flowrate (ft3/min)

Vcal--Total Volume (ft3)

Acceptable Run Average Yd 2

Yd (Vcal/Vcon)

Applicable Flowrate (ft3/min)

Time (hh:mm)

DGM Reading (ft3)

Time (hh:mm)

DGM Reading (ft3)

Run Duration

Start

Stop

Flowrate Readings 1

(ft3/min)

CDS-23s Dry Gas Meter vs DryCal

Revision Date: March 2008