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**Date:** December 14, 2011 **Subject:** Calculation of Representative Detection Levels for Metals , Particulate Matter, and

Hydrochloric Acid Emissions; Electric Utility Steam Generating Units MATS **From:** Roy

Neulicht (RTI International) **To:** Bill Maxwell

OAQPS/SPPD/ESG (D243 - 01) U.S. Environmental Protection Agency Research Triangle Park, NC 27711 **Introduction** This memorandum documents the calculation of representative detection levels (RDL) as emission rates, pound per million Btu (lb/MMBtu) for metal s , filterable particulate matter (PM), and hydrochloric acid (HCl) emissions. A December 13 , 2011 , memorandum from Peter Westlin and Ray Merrill , US EPA, Office of Air Quality Planning and Standards entitled “Data and procedure for handling below detection level data in analyzing various pollutant emissions databases for MACT and RTR emissions limits ,” provides guidance for the handling of below detection level (BDL) data and for developing RDL data. The referenced memorandum provides several tables that present RDLs for various pollutants in units of mass and concentration for representative sampling times. For the EGU MATS rule, RDLs expressed in terms of emissions rate, lb/MMBtu are needed. The purpose of this memorandum is to document the calculations used to convert the RDLs for PM, HCl, and metal emissions presented in the referenced memorandum in terms of concentration, microgram per dry standard cubic meters ( μ g/dscm) to an emission rate, lb/MMBtu . **Calculations** Except for IGCC units, t

he following equation was used to convert RDLs expressed as μ g/dscm to units of lb/MMB tu : E = C d 

### * F d 

### * (20.9 / (20.9 - % O 2

### )) Where: E = Emissions rate, lb/MMB tu C d 

### = concentration (lb/dscf) F d 

### = F Factor, dscf/MMBtu % O 2 

### = percent oxygen in flue gas Conversion: 1 lb/scf = 1.6 x 10 10 

### μ g/dscm

### 2

An oxygen content of six percent (6 %) was used for the calculations. For IGCC units, the information available was the F c 

### and flue gas carbon dioxide concentrations. Therefore, for IGCC units, the following equation was used to convert RDLs expressed as μ g/dscm to units of lb/MMB tu : E = C d 

### * F c 

### * ( 100 / % CO 2

### ) Where: E = Emissions rate, lb/MMB tu C d 

### = concentration (lb/dscf) F c 

### = F Factor, scf/MMBtu % C O 2 

### = percent carbon dioxide in flue gas Conversion: 1 lb/scf = 1.6 x 10 10 

### μ g/dscm An F c 

### value of 2 , 313 scf/MMBtu was used for the calculations. This F c 

### value is the average of the F c 

### values available from the two IGCC units in the MATS project database . A carbon dioxide content of nine percent (9 %) was used for the calculations. **Results** The results are calculated and reported as three times (3x) the RDLbecause EPA’s guidance i s to compare the calculated MACT floor to three times the RDL value , and to use the higher of the two values . T able s 1 , 2, and 3 present the results for Method 29 metals, filterable PM, and HCl, respectively. Note, to convert the calculated RDL values from units of lb/MMBtu to units of lb/MWh, we derived a conversion factor of 10 MMBtu/MW from the 2010 EU MACT ICR data. This is an average factor derived from data and was needed so the minimum RDLs calculated in accordance with Method 19 could be compared to the output based UPLs in units of lb/MWh. For all coal, oil and pet coke, we used a 3 x RDLvalue of 6.4E -4 for PM and 4.0E - 5 for HCl.

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**Table 1. Calculation of Three Times the Representative Detection Level for Metals for Method 29 Method 29 Metals**  **3 x Representative Detection Level (RDL), 4 dscm sample volume μg/dscm**  **lb/dscf lb/MMBtu at 6% O2**  **lb/MMBtu at 9% CO 2**  **All Coal Oil**  **Pet coke IGCC**  Fd, Fc = 9 , 780 9

, 190 9

, 830 2 , 313 Antimony 8.3E - 01 5.1E - 11 7.1E -07 6.6E -07 7.1E -07 1.3E -06 Arsenic 3.0E - 01 1.9E - 11 2.6E -07 2.4E -07 2.6E -07 4.8E -07 Beryllium 6.0E - 02 3.7E - 12 5.1E -08 4.8E -08 5.2E -08 9.6E -08 Cadmium 2.3E - 02 1.4E - 12 1.9E -08 1.8E -08 1.9E -08 3.6E -08 Chromium 2.3E - 01 1.4E - 11 1.9E -07 1.8E -07 1.9E -07 3.6E -07 Cobalt 2.3E - 01 1.4E - 11 1.9E -07 1.8E -07 1.9E -07 3.6E -07 Lead 2.3E - 01 1.4E - 11 1.9E -07 1.8E -07 1.9E -07 3.6E -07 Manganese 2.3E - 01 1.4E - 11 1.9E -07 1.8E -07 1.9E -07 3.6E -07 Nickel 4.1E+00 2.5E - 10 3.5E -06 3.3E -06 3.5E -06 6.5E -06 Selenium 6.0E - 01 3.7E - 11 5.1E -07 4.8E -07 5.2E -07 9.6E -07 total 5.8E -06 5.4E -06 5.8E -06 1.1E -05

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**Table 2. Calculation of Three Times the Representative Detection Level for Filterable Particulate Matter Sample Volume**  **3 x Representative Detection Level (RDL), 4 dscm sample dscm**  **μg/dscm lb/** **dscf lb/MMBtu at 6% O2**  **lb/MMBtu at 9% CO 2**  **All Coal Oil**  **Pet coke IGCC**  Fd, Fc = 9 , 780 9

, 190 9

, 830 2

, 313 1 3000 1.9E -07 2.6E -03 2.4E -03 2.6E - 03 4.8E -03 2 1500 9.4E -08 1.3E -03 1.2E -03 1.3E - 03 2.4E -03 3 1000 6.2E -08 8.6E -04 8.0E -04 8.6E - 04 1.6E -03 4 750 4.7E -08 6.4E -04 6.0E -04 6.5E - 04 1.2E -03 **Table 3. Calculation of Three Times the Representative Detection Level for HC l**  **Sample Volume 3 x Representative Detection Level (RDL), 4 dscm sample**  **dscm μg/dscm**  **lb/dscf lb/MMbtu at 6% O**  **2 lb/MMBtu at 9% CO**  **2 All Coal**  **Oil Pet coke**  **IGCC** Fd, Fc = 9 , 780 9

, 190 9

, 830 2

, 313 1 1.8E+02 1.1E -08 1.5E - 04 1.4E -04 1.5E -04 2.9E -04 2 9.0E+01 5.6E -09 7.7E - 05 7.2E -05 7.7E -05 1.4E -04 3 6.0E+01 3.7E -09 5.1E - 05 4.8E -05 5.2E -05 9.6E -05 4 4.5E+01 2.8E -09 3.9E - 05 3.6E -05 3.9E -05 7.2E -05