# PES A MACTEC COMPANY ,.s.-.-----­ -/-­ ~~­ _­
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To: Organic Liquids Distribution NESHAP Docket From: Ken Meardon, Pacific Environmental Services Date: August 5,2003 Subject: MACT Floor Analysis for Storage Tanks Pacific Environmental Services, Inc. 5001 South Miami Boulevard, Suite 300 P.O. BOX 12077 ResearchTriangle Park, NC 27709 Office: 919/941-0333 Fax: 919/941-0234 Home Page: www.mactec.com

The purpose of this memorandum is to present the MACT floor analysis for storage tanks. The tanks used in the floor analysis are presented in Attachment 

### 1. The tanks used in this analysis are only those tanks identified in the “Baseline Emissions and Emissioi?Reductions” memorandum that have the necessary information (e.g., capacity, HAP vapor pressure) to be included in the floor analysis. There are 855 tanks in the promulgation dahbase and 659 tanks in the floor analysis. The top performing 12% 

### of tanks is represented by the top 103 tanks for the entire database or the top 79 tanks based on the tanks for which sufficient information is available to analyze the controls applied to the tanks. In either case, the top performing 

### 79 and 

### 103 tanks are represented by fixed roof tanks with add-on controls, fixed roof tanks with internal floating roofs, and tanks with external floating roofs achieving at least 95 percent emission reduction. There are at least 227 of these tanks in the database. In analyzing the MACT floors for storage tanks, we arrayed the informationbased on tank size and HAP vapor pressure of the liquid(s) being stored. This is a well-documented approach for analyzing storage tanks. Tanks with smaller capacities storing liquids with lower vapor pressures have lower emissions than tanks with larger capacities storing liquids with higher vapor pressures. Table 1 presents the data for the best controlled tanks (those achieving at least 

### 95% control with add-on controls and those tanks with the best internal and floating roofs) and the total number of tanks for five tank capacity ranges and up to six vapor pressure ranges within each capacity range. Table 2 presents the data in three broad capacity ranges: less than 5,000 gallons, 5,000 to 50,000 gallons, and 50,000 gallons or more. For the two larger capacity ranges, the vapor pressure ranges are divided into 4 ranges: <0. 1, 0.1 to 4.9, 1.9to C4.0, and 24.0.MACT Floor Analysis for Storage 

### Tanks page 2 TABLE 1. PROMULGATION ANALYSIS 

## - STORAGE TANKS (NonCrude 

### 2 5% HAP and Crude Oil; 95+% Control Efficiency) 

# 1 Capacity 

# I vapor Comments on ControlledTank Counts (gallons) Pressme Range Total <5,000 

### <o. 1 0 

# I 12 0.1 to <4.0 0, 18



### - >4 .Q 0 0 5,000 to 

### <o.B 0 9 0.1 to 4.9 

# I 0 7 

## 1 1.9 to <4.0 0 12 

# I
- >4.0 1 2 195%fixed roof 10,000 to 

### <o. I 0 5 <20,000 0.1 to <0.5 0.5 to <0.75 0.75 to -4.9

1.9to <4.0
20,000 to 

### <o. 1 

# I <50,000 

# 1 0.1 to <0.5 0 1 0 3

~ ~~ 0 7 

# I 24.0 1 3 compliant IFR 250,000 

### <o. 1 9 1 fixed roof tank at 295%; rest compliant 132 floating rooftanlts 

# 1 5 fixed roof tanks at 295% reduction; rest 0.1 t0<0.5 

# I 64 

# I 159 

# 1 compliant floatina

1

roof tanks I I 1 0.5 to c0.75 

## I 14 

## i 33 

# I compliant floatingroof tanks 

# 1I
0.75 to<I.9 

# I 34 

# I 76 

# 1 4 fixed roof tanks at 295% reduction; rest compliant floatingroof tanks 1 1.9 to c4.0 91 115 compliant floating roof tanks



### - >4.0 9 17 compliant floating roof tanks

~ ~ 

# I a11 

# 1 227 

# I 659



### 2MACT Floor Analysis for Storage Tanks Page 3 TABLE 

### 2. FLOOR ANALYSIS FOR STORAGE TANKS

HAP Vapor Cumulative Counts Is there a floor for Capacity Pressure Range (gallons) (psia) Controlled high vapor pressure) Existing 0 30 5,000 to <50,000 0.1 to 4.9 1.9to <4.0
250,000 0.1 to C1.9 112 268 121 1400 YES YES 1.9 to <4.0 91 115 212 I515 YES YES 24.0 9 17 221 I532 YES YES As seen in Table 2, none of the storage tanks with capacities of less than 

### 5,000 gallons are controlled. Similarly, none of the storage tanks with capacities of less than 50,000 gallons are controlling liquids whose HAP vapor pressure is less than 0.1. Thus, for these tanks, there are no additional emission reduction floors for existing or new tanks identified. About 40% of all tanks with capacity of 50,000 gallons or more are controlled by at least 95% by add-on control devices or they are equipped with the best internal or external floating roofs. Floors for both existing and new tanks are identified for these tanks at all vapor pressure ranges. For the tanks in the 5,000 to <50,000 gallon capacity ranges, we looked at the ratio of cumulativenumber of the best controlled tanks to total tanks as the HAP vapor pressure increased. For existing tanks, only when the HAP vapor pressure reached at least 4.0 psia were there sufficient tanks being controlled to identify a 

### MACT floor. Below 4.0 psia, the floor for existing tanks is identified as no additional emission reduction. For new tanks, control 

### is identified for tanks storing liquids with 

### a HAP vapor pressure as low as 0.1 psia. This sets the floor for new tanks in this capacity range. For new tanks with capacities between 5,000 and 50,000 gallons, no additional emission reduction floor was identified for tanks storing liquids with a 

### HAP vapor pressure of less than 0.1 pia. For existing storage tanks in the 

### 5,000 to <50,000 gallons capacity range, the sixth facility represents the median facility. This facility is achieving a 95% reduction. For existing storage tanks with capacities of 50,000 gallons or greater, the median facilities for all of the vapor pressure ranges is represented by the best performing internal or external floating roof tank. The performance 

### of these tanks varies based on the liquid being stored, but generally achieves at least 95% reduction. 

### 3ATTACHMENT 1

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