Stage I Vapor Control Requirements
Instructions for Form S2
Form S2 contains specific equipment / process-related information on the facility being permitted. One Form S2 is
to be completed for each permit application when new equipment is to be installed or existing, permitted equipment
is to be modified.
LOCATION, OPERATION and PROJECTED GASOLINE THROUGHPUT
FACILITY NAME: List the gasoline dispensing facility name.
LOCATION: List the address of the facility.
GASOLINE DISPENSING START DATE: List the potential start date for a new, modified or reconstructed facility.
OTHER PERMITTED FACILITIES IN MECKLENBURG COUNTY: If the Owner and\or Operator has any other Air
Quality Permits issued by Mecklenburg County, list the Permit Numbers.
Monthly Throughput: Total volume of gasoline loaded into or dispensed from all storage tanks at the GDF during a
month.
Calculation of Monthly Throughput:
Summing the volume of gasoline loaded into, or dispensed from (i.e., not both) all storage tanks during the current
day, plus the total volume of gasoline loaded or dispensed from storage tanks during the previous 364 days, then
divide that sum by 12.
NOTE: This applies to any sequential 365 day time period, not just a calendar year.
PROJECTED ACTUAL ANNUAL LOADING OF GASOLINE INTO STORAGE TANKS (in gallons): List the
projected actual annual loading of gasoline into storage tanks for the facility. Previously unpermitted facilities must
provide a projected annual gasoline loading figure. Previously permitted Stage I gasoline dispensing facilities that
will be modified or reconstructed must provide a projected annual gasoline loading figure. Per MCAPCO
Regulation 2.0928 – “Gasoline Service Stations Stage I”, gasoline dispensing facilities exceeding 50,000 gallons
combined annual throughput of gasoline at a facility is not exempt and must have an air quality permit. This is
applicable to facilities making gasoline product transfers from truck tanks to storage tanks or gasoline product
transfers from tank to tank.
EMISSION SOURCES
TANK TYPE: List if the tank is an above ground storage tank (AST) or an underground storage tank (UST).
TANK CAPACITY: List the tank capacity (in gallons) for the non-exempt gasoline storage tank(s).
PRODUCT STORED: List the type of product to be stored in the tank [i.e., regular, mid-grade, premium, racing, or
ethanol (E-85)].
ORIGINAL INSTALLATION DATE OF TANK: List the initial installation date of the storage tank.
STAGE I VAPOR CONTROL/VAPOR BALANCE SYSTEM INSTALLATION DATE: List the initial installation date
of the Stage I vapor control/vapor balance equipment.
GASOLINE STORAGE TANK AND/OR PRESSURE/VACUUM VALVE REPLACEMENT DATE:
If gasoline storage tank(s), submerged fill pipes or pressure/vacuum valve(s) were replaced, list the dates.
INSIGNIFICANT ACTIVITY SOURCE(S)
INSIGNIFICANT ACTIVITY DESCRIPTION - List exempted insignificant activity sources, per MCAPCO Regulation
1.5211 (g)((1), MCAPCO Regulation 2.0928 and 40 CFR 63, Subpart CCCCCC. Contact MCAQ regarding
emergency generators.
(MCAPCO Regulation 1.5211)
(g) The following activities do not need a permit or permit modification under this Article; however the Director may
require the owner or operator of these activities to register them under MCAPCO Regulation 2.0202 - "Registration
of Air Pollution Sources":
(D) storage tanks:
(i)
storage tanks used solely to store fuel oils, kerosene, diesel, crude oil, used motor oil, lubricants,
cooling oils, natural gas or liquefied petroleum gas;
(ii)
storage tanks used to store gasoline for which there are no applicable requirements except Stage I
Mecklenburg County Air Quality – Permit Application
S2 Form Instruction, Rev. 06/11
controls under MCAPCO Regulation 2.0928 - "Gasoline Service Stations Stage I";
storage tanks used solely to store inorganic liquids; or
storage tanks or vessels used for the temporary containment of materials resulting from an
emergency response to an unanticipated release of hazardous materials;
(2) activities exempted because of size and production rate (These activities shall not be included in the
permit. If the facility is subject to the permitting procedures under MCAPCO Section 1.5500 - "Title V
Procedures", these activities shall be listed on the permit applications; otherwise, these activities shall not be
listed on the permit applications.):
(A) storage tanks:
(i)
above-ground storage tanks with a storage capacity of no more than 1100 gallons storing organic
liquids with a true vapor pressure of no more than 10.8 psi absolute at 70oF; or
(ii)
underground storage tanks with a storage capacity of no more than 2500 gallons storing organic
liquids with a true vapor pressure of no more than 10.8 psi absolute at 70oF;
(iii)
(iv)
STAGE I VAPOR CONTROL/VAPOR BALANCE SYSTEM COMPONENTS
Stage I Vapor Control/Vapor Balance System Components:
Coaxial Poppeted Vapor Control/Balance Adaptor - Delivery of product and the recovery of vapors occurs
through a single coaxial fitting on the storage tank. To accommodate this tube within a tube arrangement, the two
hoses from the tanker hook onto a coaxial coupling (adapter) or delivery elbow. The fill tube is usually spring
loaded (moveable) which allows for it to be pushed down approximately 1"when securing the coupling. In its
resting position it maintains a vapor seal, against the fitting, similar to the dry break seal with dual system. Product
is delivered through the inner drop tube while vapor is recovered in the space between the walls of the inner and
outer tubes at the top of the tank. NOTE: Coaxial vapor controls cannot be installed at new, modified or
reconstructed facilities.
Diameter - All vent pipe shall be a minimum of two (2) inches in diameter or meet the local fire Codes.
Dual Poppeted Vapor Control/Balance Adaptor - Delivery of product to the facility’s stationary storage tank and
recovery of displaced vapor occurs through two separate openings in the tank. Product is dropped through the
submerged fill pipe while the vapor is forced up a riser pipe. Vapor control/balance riser pipe openings are fitted
with a spring loaded poppet valve that maintains a tight seal when a vapor control / balance hose is not connected.
Height - Individual or manifolded vent lines equipped with pressure relief valves must be installed at a height of 12
feet above the driveway surface used for Stage I tank truck filling operations and in accordance with the applicable
fire and safety codes. The outlets shall vent upward and be located to eliminate the possibility of vapor
accumulating or traveling to a source of ignition or entering adjacent buildings.
Manifold - The gasoline storage tanks are connected by a common header from which a single pipe leads to a
pressure/vacuum vent.
Poppeted Vapor Control/Balance Adaptor - A vapor control/balance adaptor that automatically and immediately
closes itself maintaining a tight seal when the vapor control/vapor balance system line is not connected.
Pressure/Vacuum Release Valve Performance Specifications- The release valve shall be installed on all vent
pipe for Stage I Vapor recovery to prevent the tanks from venting vapors between loading and to protect the tanks
from physical damage or permanent deformation caused by routine increases in internal pressure or vacuum
The 40 CFR 63, Subpart CCCCCC federal rule was adopted on January 10, 2008 and amended on March 7,
2008, June 25, 2008 and January 24, 2011. With the exception of a Stage I gasoline dispensing facility that is
new, reconstructed, or has replaced a gasoline storage tank and averages ≥ 100,000 gallons per month, all other
facilities may continue to use their existing pressure/vacuum valve(s) that is/are capable of 3” ± 0.5” of H 2O
pressure and 8" + 2.0" vacuum).
Since January 10, 2008, if a Stage I gasoline dispensing facility that is new, reconstructed, or has replaced a
gasoline storage tank and averages ≥ 100,000 gallons per month, the facility must install the pressure/vacuum
valve described in 40 CFR 63, Subpart CCCCCC, Table 1, which requires:
- a positive pressure setting of 2.5 to 6.0 inches of water;
- a negative pressure setting of 6.0 to 10.0 inches of water;
- a total leak rate of all PV vent valves at an affected facility, including connections, that shall not exceed
0.17 cubic foot per hour at a pressure of 2.0 inches of water and 0.63 inches cubic foot per hour at a
Mecklenburg County Air Quality – Permit Application
S2 Form Instruction, Rev. 06/11
vacuum of 4 inches of water.
Slope - All vapor return lines and vent pipes shall slope a minimum of 1/8 inch per foot. A slope of 1/4 inch or more
per foot is recommended wherever feasible.
Submerged Fill Pipes:
While gasoline is transferred from one storage tank to another, agitation or splashing will cause aeration of the
liquid and thereby increase the formation of vapor. This is minimized by using a submerged fill pipe to deliver
product under the surface of liquid in the tank. The fill pipe is usually an aluminum sleeve fitted inside the drop
tube.
MCAQ requires all storage tank submerged fill pipes installed after November 9, 2006 to be ≤ 6 inches from
the bottom of the storage tank.
If the opening of the submerged fill pipe is cut at a slant, the distance is measured from the top of the slanted cut to
the bottom of the tank.
Vapor Lines and Gasoline Product Loading Rates:
No more than one (1) tank shall be loaded at a time if the manifold vapor lines are size 2 ½ inches (i.e., internal
diameter) and smaller. If the manifold vapor lines are 3 inches (i.e., internal diameter) and larger, then a maximum
of two (2) tanks at a time may be loaded.
STAGE I VAPOR CONTROL/VAPOR BALANCE SYSTEM REQUIREMENTS
MANAGEMENT PRACTICES FOR ALL STAGE I GASOLINE DISPENSING FACILITIES
Mark the block if the following management practice will be implemented or exists:
- Minimization of gasoline spills;
- Cleaning up of gasoline spills as expeditiously as possible;
- Covering all open gasoline containers and all gasoline storage tank fill-pipes with a gasketed seal when not
in use;
- Minimization of gasoline being sent to open waste collection systems, such as oil/water separators
MALFUNCTIONS
Record the number, duration, description of malfunctions and the actions taken to minimize emissions due
to the vapor balance system during the calendar year. File a report with MCAQ by March 15 of the
following year if malfunctions occurred.
TANK CAPACITIES WITH NO VAPOR CONTROL/VAPOR BALANCE REQUIREMENTS
Mark the block if the following gasoline storage tanks are on the premises.
- gasoline storage tanks with a capacity of < 250 gallons that are constructed after January 10, 2008;
- gasoline storage tanks with a capacity of < 2,000 gallons that are constructed before January 10, 2008;
- gasoline storage tanks equipped with floating roofs, or the equivalent
MANIFOLDED VAPOR CONTROL/VAPOR BALANCE LINE SIZE AND GASOLINE LOADING
List the manifolded gasoline storage tanks required to have poppeted vapor control adaptor valves.
Mark the block indicating the internal diameter of the vapor control lines. Lines which are ≤ 2.5 inches in diameter
may only load one (1) gasoline storage tank at a time. Lines which are ≥ 3.0 inches in diameter may load two (2)
gasoline storage tanks at a time.
SUBMERGED FILL PIPE DISTANCE REQUIREMENTS
Mark the block for the submerged fill pipe distances above the bottom of the gasoline storage tank.
- ≤ 12 inches from the bottom of the gasoline storage tank, if installed on or before November 9, 2006;
- ≤ 6 inches from the bottom of the gasoline storage tank, if installed after November 9, 2006
If cut on a slant, measure the submerged fill pipe distance from the bottom of the gasoline storage tank to the top of
the slant cut.
NOTE: All new installations of submerged fill pipes on gasoline storage tanks at existing, permitted facilities must
be ≤ 6 inches from the bottom of the the tank by January 10, 2011.
Submerged fill pipe compliance option. Submerged fill pipes not meeting the above distance requirements
are allowed if the owner or operator can demonstrate that the liquid level in the tank is always above the
entire opening of the fill pipe. MCAQ will review the facility documentation to determine compliance via
this alternative method.
Mecklenburg County Air Quality – Permit Application
S2 Form Instruction, Rev. 06/11
STAGE I VAPOR CONTROL/VAPOR BALANCE SYSTEM ADAPTOR VALVES
Mark the block indicating the type of vapor control/vapor balance system adaptor valve(s) that will be/are installed.
- Dual point/poppeted vapor control/vapor balance adaptor;
Where manifolded vapor lines are used, poppeted vapor control adaptors shall be used.
NOTE: Existing installed coaxial vapor adaptor(s) may continue to be used until they are required to be replaced
by the rule; however, coaxial vapor adaptor(s) may not be installed as new equipment.
VENT PIPES
Mark the block indicating the how the vent pipe(s) will be configured on the premises. List the correlating tanks
associated with the vent pipes.
- Vent pipe shall be a minimum of two (2) inches in diameter or meet the local fire codes;
- Individual vent pipe for each gasoline storage tank, ≥ 12 feet above the lot surface;
- Manifolded vent pipe ≥ 12 feet above the lot surface;
- Vent pipes on gasoline storage tanks with vapor controls have pressure release valves or restrictors;
- Projected/known average monthly gasoline dispensing total for the facility < 100,000 gallons;
- Projected/known average monthly gasoline dispensing total for the facility ≥ 100,000 gallons. The pressure
release valve will meet 40 CFR 63, Subpart CCCCCC, 63.11118, Table 1 performance specifications.
PERFORMANCE TEST REQUIREMENTS FOR VAPOR CONTROL/VAPOR BALANCE SYSTEM
All new, reconstructed or facilities which replace existing, permitted gasoline storage tanks that also have
a projected/known average monthly gasoline dispensing throughput ≥ 100,000 gallons must conduct an
initial performance test on the vapor control/vapor balance system when the affected source becomes
subject (i.e., prior to commencing gasoline dispensing operations) to the performance testing requirements
contained within 40 CFR 63, Subpart CCCCCC, 63.11120.
Equipment To Be Tested (Pressure Vacuum Vent Valve and Vapor Balance System) and Test Procedure
Pressure Vacuum Vent Valve
Owner must demonstrate compliance of the vapor control/vapor balance system pressure-vacuum vent
valves installed on the gasoline storage tanks with the leak rate and cracking pressure requirements of
California Air Resources Board (CARB) Vapor Recovery Test Procedure TP-201.1E, - “Leak Rate and
Cracking Pressure of Pressure/Vacuum Vent Valves”, adopted October 8, 2003 (incorporated by reference
see 63.14)
Vapor Balance System (Choose one of the following tests)
Owner must demonstrate compliance of the vapor control/vapor balance system with the static pressure
performance requirements of California Air Resources Board (CARB) Vapor Recovery Test Procedure TP
TP 201.3 – “Determination of 2-Inch WC Static Pressure Performance of Vapor Recovery Systems of
Dispensing Facilities, adopted April 12, 1996 and amended March 17, 1999 (incorporated by reference see
63.14) OR
Owner must demonstrate compliance of the vapor control/vapor balance system with the static pressure
performance requirements of California Air Resources Board (CARB)(Bay Area Air Quality Management
District) Vapor Recovery Test Procedure ST-30 – “Static Pressure Integrity Test Underground Storage
Tanks”, adopted November 30, 1983 and amended December 21, 1994.
Contact MCAQ if an alternative vapor control/vapor balance system is proposed.
Performance Test Timeline Overview
-
Initial test of the vapor control/vapor balance system must be conducted within 180 days of the
facility becoming an affected source;
A written Performance Test Notification form must be submitted to MCAQ 60 days prior to the test;
Test must be conducted prior to the facility commencing gasoline dispensing operations;
Test results must be submitted to MCAQ within 60 days of the completed test;
The facility must conduct the same tests again every three (3) years thereafter
Mecklenburg County Air Quality – Permit Application
S2 Form Instruction, Rev. 06/11
SECTION S
S2
STAGE I GASOLINE DISPENSING FACILITY
Facility Name:
Location:
When did/will the gasoline dispensing operation start? (Enter date):
Does the Owner and/or Operator have any other Air Quality Permits issued by Mecklenburg County?
If Yes, list the Permit Numbers:
Projected Monthly Gasoline Throughput (in gallons):
Yes
No
Projected Annual Gasoline Throughput (in gallons):
EMISSION SOURCE(s)
Indicate Type of
Storage Tank:
Above ground (AST)
Underground (UST)
Tank Capacity
(in gallons)
Product
Stored
Original Installation
Date of Tank
Stage I Vapor
Control/Vapor Balance
System Installation
Date
Storage Tank,
Submerged Fill Pipe
and/or Pressure Vacuum
Valve Replacement Date
(if applicable)
INSIGNIFICANT ACTIVITY SOURCE(s)
Insignificant Activity Description
Insignificant Activity Applicable Regulation
[i.e., diesel fuel or kerosene storage tanks, (if present)]
MCAPCO 1.5211(g)(1)(D)(i) – diesel fuel storage tank (i.e., automobiles)
MCAPCO 1.5211(g)(1)(D)(i) – diesel fuel storage tank (i.e., trucks)
MCAPCO 1.5211(g)(1)(D)(i) – kerosene fuel storage tank
STAGE I REQUIREMENTS
MANAGEMENT PRACTICES FOR ALL STAGE I GASOLINE DISPENSING FACILITIES. MARK IF COMPLIANCE PROCEDURES EXIST.
Minimize gasoline spills
Clean up spills as expeditiously as practicable
Cover all open gasoline containers and all gasoline storage tank fill-pipes with a gasketed seal when not in use
Minimize gasoline sent to open waste collection systems, such as oil/water separators
TANK CAPACITIES WITH NO VAPOR CONTROL / VAPOR BALANCE CONTROL REQUIREMENTS. MARK AND LIST IF PRESENT.
gasoline storage tanks with a capacity of < 250 gallons that are constructed after January 10, 2008
gasoline storage tanks with a capacity of < 2,000 gallons that are constructed before January 10, 2008
gasoline storage tanks equipped with floating roofs, or the equivalent
MANIFOLDED VAPOR CONTROL / VAPOR BALANCE LINE SIZE AND GASOLINE LOADING
Gasoline storage tanks with manifolded vapor control shall have poppeted vapor control adaptor valves. Mark the appropriate block indicating the
internal diameter o f the vapor control lines:
≤ 2.5 inches [.e., no more than one(1) gasoline storage tank may be loaded at a time]
≥ 3.0 inches [.e., two(2) gasoline storage tanks may be loaded at a time]
SUBMERGED FILL PIPE DISTANCE REQUIREMENTS FROM THE BOTTOM OF THE TANK
(If cut on a slant, measure distance from the top of the slant.)(Excluding tanks with capacities of < 250 gallons)
NOTE: All new installations of submerged fill pipes on gasoline storage tanks at existing, permitted facilities must be ≤ 6 inches from the bottom of
the tank by 1/10/11.
≤ 12 inches from the bottom of the gasoline storage tank, if installed on or before November 9, 2006
≤ 6 inches from the bottom of the gasoline storage tank, if installed after November 9, 2006
Submerged fill pipes are not the proper distance above the bottom of the UST. Facility will ensure and demonstrate that the liquid level in the
tank will always be above the entire opening of the fill pipe.
Mecklenburg County Air Quality – Permit Application
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S2 Form, Rev. 06/11
Vapor Control/Vapor
Balance System
Adaptor Valve
Dual Point / Poppeted Vapor Control / Vapor Balance Adaptor
NOTE: Existing installed coaxial vapor adaptor(s) may continue to be used until they are required to be replaced
by the rule; however, coaxial vapor adaptor(s) may not be installed as new equipment.
Vent pipes on tanks with Stage I controls (gasoline tanks) shall have pressure release valves or restrictors.
Mark the blocks indicating the vent pipe configuration and type of pressure release valve / restrictor or pressure / vacuum valve present:
Individual Vent Pipe(s)
List affected gasoline storage tank(s):
Manifolded Vent Pipe(s)
List affected gasoline storage tanks:
Pressure Release Valve
or Restrictor:
Projected average monthly gasoline loading total for the facility < 100,000 gallons
Pressure / Vacuum
Valve (P/V Valve):
Projected average monthly gasoline loading total for the facility ≥ 100,000 gallons. The pressure release valve
will meet 40 CFR 63, Subpart CCCCCC, 63.11118, Table 1, (g) performance specifications.
PERFORMANCE TEST REQUIREMENTS FOR PV VENT VALVE AND VAPOR BALANCE SYSTEM
All new, reconstructed or facilities which replace existing, permitted gasoline storage tanks that also have a projected average monthly
gasoline loading ≥ 100,000 gallons must conduct an initial performance test on the vapor control/vapor balance system when the affected
source becomes subject (i.e., prior to commencing gasoline dispensing operations) to the performance testing requirements contained
within 40 CFR 63, Subpart CCCCCC, 63.11120.
Equipment To Be Tested
Pressure Vacuum Vent Valve
-
Owner must demonstrate compliance of the vapor control / vapor balance system pressure-vacuum vent valves installed on the gasoline
storage tanks with the leak rate and cracking pressure requirements of California Air Resources Board (CARB) Vapor Recovery Test
Procedure TP-201.1E, - “Leak Rate and Cracking Pressure of Pressure/Vacuum Vent Valves”, adopted October 8, 2003 (incorporated by
reference see 63.14). [Per the requirements of 40 CFR 63, Subpart CCCCCC, Table 1,(g)]
Vapor Balance System (Choose one of the following tests)
-
Owner must demonstrate compliance of the vapor control/vapor balance system with the static pressure performance requirements of
California Air Resources Board (CARB) Vapor Recovery Test Procedure TP-201.3, - “Determination of 2-Inch WC Static Pressure
Performance of Vapor Recovery Systems of Dispensing Facilities”, adopted April 12, 1996, and amended March 17, 1999 (incorporated
by reference see 63.14).
. OR
Owner must demonstrate compliance of the vapor control/vapor balance system with the static pressure performance
requirements of California Air Resources Board (CARB) (Bay Area Air Quality Management District) ST-30 – “Static Pressure
Integrity Test Underground Storage Tanks”, adopted November 30, 1983, amended December 21, 1994.
Contact MCAQ if an alternative vapor control/vapor balance system exists
Performance Test Timeline Overview
-
Initial test of the vapor control/vapor balance system must be conducted within 180 days of the facility becoming an affected
source;
A written Performance Test Notification form must be submitted to MCAQ 60 days prior to the test;
Test must be conducted prior to the facility commencing gasoline dispensing operations;
Test results must be submitted to MCAQ within 60 days of the completed test;
The facility must conduct the same tests again every three (3) years thereafter
Mecklenburg County Air Quality – Permit Application
Page 2
S2 Form, Rev. 06/11