Section 336.1621. Emission of volatile organic compounds from existing metallic surface coating lines.

(1) A person shall not cause or allow the emission of volatile organic compounds from the coating of metallic surfaces from any existing coating line in excess of the applicable emission rates as follows:

(a)     Four and three-tenths pounds of volatile organic compounds emitted per gallon of coating, minus water, as applied for clear coatings.

(b)   Three and one-half pounds of volatile organic compounds emitted per gallon of coating, minus water, as applied for air-dried coatings.

(c)   Three and one-half pounds of volatile organic compounds emitted per gallon of coating, minus water, as applied for extreme performance coatings.

(d)    Four and eight-tenths pounds of volatile organic compounds emitted per gallon of coating, minus water, as applied for truck final repair coatings.

(e)     Four and nine-tenths pounds of volatile organic compounds emitted per gallon of coating, minus water, as applied for glass adhesion body primer. For the purpose of this subdivision, "glass adhesion body primer" means the prime coating that is applied to automobile or truck bodies as part of the glass bonding system.

(f)    Four and three-tenths pounds of volatile organic compounds emitted per gallon of coating, minus water, as applied for steel pail and drum interior coatings.

(g)   Three pounds of volatile organic compounds emitted per gallon of coating, minus water, as applied for all other coatings.

(2)   If the provisions of more than 1 subdivision of subrule (1) of this rule are applicable for a specific coating, then the least stringent provision shall apply.

(3)   To take credit for improved transfer efficiency, upon written request and approval by the department, a person may achieve the emission limits specified in subrule (1) of this rule by an equivalent emission limit expressed in pounds of volatile organic compounds emitted per gallon of applied coating solids. The equivalent emission limit shall be established by the following equation:

Where:

A =         E

(TE)

S         b

100

A = Allowable equivalent emission limit, pounds of volatile organic compounds per gallon of applied coating solids.

E = Applicable emission limit as specified in subrule (1) of this rule, pounds of volatile organic compounds per gallon of coating, minus water, as applied.

S = Solids volume fraction representative of a compliance coating, gallon of solids per gallon of coating, minus water, as applied.

The value of "S" shall be determined by using the following equation:

S = 1 -

E

7.36

(TE)b = Overall baseline transfer efficiency of the coating line as specified in subrule (4) of this rule, percent. Where multiple application methods are used on the coating line, the overall baseline transfer efficiency shall be determined using the method described in R 336.2040 (9). Department approval of the transfer efficiency test method is required.

(4)    For the purpose of establishing an equivalent emission limit under subrule (3) of this rule, the value of (TE)b, the overall baseline transfer efficiency of the coating line, shall be 60%. Notwithstanding this provision, a person may request, in writing to the department, and the department may approve, a value for (TE)b that is less than 60%, but not less than 40%. A request for a value for (TE)b of less than 60% shall include a demonstration that the lower requested value is representative of the overall transfer efficiency achieved by similar coating lines which use the most efficient type of application equipment that is reasonably available for the similar coating lines.

(5)   A person who is responsible for the operation of a coating line that is subject to this rule shall obtain current information, and keep daily records necessary, for the determination of compliance with the provisions of this rule, as required in R 336.2041.

(6)   For each coating line, compliance with the emission limits specified in this rule shall be based upon all of the following:

(a)   The volume-weighted average of all coatings which belong to the same coating category and which are used during each calendar day averaging period. The department may specifically authorize compliance to be based upon a longer averaging period, which shall not be more than 1 calendar month.

(b)   If coatings that belong to more than 1 coating category are used on the same coating line during the specified averaging period, then compliance shall be determined separately for each coating category.

(c)   The information and records required by subrule (5) of this rule.

(7)   Compliance with the emission limits specified in this rule shall be determined using the applicable method described in the following subdivisions:

(a)    For coating lines that are subject to the emission limits specified in subrule (1) of this rule, the method described in either R 336.2040(12)(a) if the coating line has no add-on emissions control device or R 336.2040(12)(b) if the coating line has 1 or more add-on emissions control devices.

(b)   For coating lines subject to the equivalent emission limits specified in subrule (3) of this rule, the method described in either R 336.2040(12)(e) if the coating line has no add-on emissions control device or R 336.2040(12)(f) if the coating line has 1 or more add-on emissions control device.

(8)     This rule  does   not  apply  to   the  coating  of  metallic  surfaces  that  are   subject  to R 336.1610.

(9)   This rule does not apply to any of the following:

(a)   Automobile refinishing.

(b)   Customized topcoating of less than 35 automobiles or trucks, or both, per day.

(c)     Coating of the exterior of airplanes when the part to be coated has already been assembled on the airplane.

(d)   Coating of the exterior of marine vessels when the part to be coated has already been assembled on the marine vessel.

(e)      Coating of a part consisting of both metallic and nonmetallic components if a demonstration is made, to the satisfaction of the department, that the limits of this rule cannot be met due to the presence of the nonmetallic component. In this case, and if the nonmetallic component of the part is plastic and used as an automobile, truck, or business machine plastic part, R 336.1632 shall apply to the coating of the part.

(10)   This rule, except for subrule (5) of this rule, does not apply to a metallic surface coating line that complies with both of the following provisions:

(a)   The coating line has an actual emission rate of volatile organic compounds equal to or less than 2,000 pounds per month and 10.0 tons per year as of the effective date of this amendatory rule. If the actual rate of emissions from an exempted metallic surface coating line exceeds 2,000 pounds per month for a subsequent month or 10.0 tons per year for a subsequent year, then the provisions of this rule shall thereafter permanently apply to the metallic surface coating line.

(b)    Volatile organic compound emissions from the coating line, when combined with the total emissions of volatile organic compounds from all other metallic surface coating lines at the stationary source that are exempted by this subrule, do not exceed 30.0 tons per year.

(11)     A person may exclude low-use coatings that total 55 gallons or less per rolling 12-month period at a stationary source from the provisions of this rule, except for subrule (5) of this rule.

(12)   A person may discontinue the operation of a natural gas-fired afterburner, which is used to achieve compliance with the emission limits in this rule,  between  November  1  and March 31 unless the afterburner is used to achieve compliance with, or is required by, any of the following:

(a)   Any other provisions of these rules.

(b)   A permit to install.

(c)   A permit to operate.

(d)  A voluntary agreement.

(e)   A performance contract.

(f)  A stipulation.

(g)   An order of the department.

(13)   If the operation of a natural gas-fired afterburner is discontinued between November 1 and March 31 under subrule (12) of this rule, then both of the following provisions shall apply between November 1 and March 31:

(a)   All other provisions of this rule, except the emission limits, shall remain in effect.

(b)   All other measures that are used to comply with the emission limits in this rule between April 1 and October 31 shall continue to be used.

History: 1981 AACS; 1993 AACS; 1998-2000 AACS.