Section 20-768. SOLVENT CLEANING – ALTERNATIVE COMPLIANCE

 

768.1 As an alternative to complying with the provisions of §§ 764 through 767, the operator of a solvent cleaning machine may demonstrate compliance with § 768.3 and 768.4. 

 

768.2 The operator shall maintain records sufficient to demonstrate compliance. The records, which shall be maintained for not less than two (2) years, shall include, at a minimum, the quantity of solvent added to and removed from the solvent cleaning machine, and the dates of the addition and removal.

 

768.3 If the cleaning machine has a solvent/air interface, the owner or operator shall:

 

(a) Maintain a log of solvent additions and deletions for each solvent cleaning machine; and

 

(b) Ensure that emissions from each solvent cleaning machine are equal to or less than the applicable emission limit presented in Table II of this section.

 

Table II.  Emission limits for Batch Vapor and In-Line Solvent Cleaning Machines with a Solvent/Air Interface

 

Solvent Cleaning Machine	Three (3) Month Rolling Average (kg./m.2/month)	Monthly Emission Limit: (lb./ft.2/month)
Solvent cleaning machines batch vapor	150	30.7
Existing in-line solvent cleaning machines	153	31.3
New in-line solvent cleaning machines	99	20.2

 

768.4  If the cleaning machine is a batch vapor cleaning machine and does not have a solvent/air interface, the owner or operator shall:

 

(a)  Maintain a log of solvent additions and deletions for each solvent cleaning machine; and

 

(b) Ensure that the emissions from each solvent cleaning machine are equal to or less than the appropriate limits as described in § 768.5 and 768.6. Each owner or operator of a batch vapor or in-line cleaning machine shall demonstrate compliance with the applicable three (3) month rolling average monthly emission limit on a monthly basis.

 

768.5 For cleaning machines with a cleaning capacity that is less than or equal to two and ninety-five one hundredths cubic meters (2.95 m.3), the emission limit shall be determined using Table I in § 767.3 or the equation in § 768.6. If the table is used, and the cleaning capacity of the cleaning machine falls between two cleaning capacity sizes, then the lower of the two (2) emission limits applies; 

 

768.6  For cleaning machines with a cleaning capacity that is greater than two and ninety-five one hundredths cubic meters (2.95 m.3), the emission limit shall be determined using the following equation:

 

EL = 330 (vol)0.6

 

where:

 

EL=  the three (3) month rolling average monthly emission limit (kilograms/month);

 

vol = the cleaning capacity of machine (cubic meters);

 

768.7 Each owner or operator of a batch vapor or in-line solvent cleaning machine shall demonstrate compliance with the applicable three (3) month rolling average monthly emission limit on a monthly basis. If the applicable three (3) month rolling average emission limit is not met, an exceedance has occurred. All exceedances shall be reported to the District within thirty (30) days of the determination of the exceedance.

 

768.8 The owner or operator of a batch vapor or in-line solvent cleaning machine shall maintain records and determine compliance in accordance with the following:

(a) On the first operating day of every month ensure that the solvent cleaning machine system contains only clean liquid solvent;

 

(1) This includes, but is not limited to, fresh unused solvent, recycled solvent, and used solvent that has been cleaned of soils;

 

(2) A fill line must be indicated during the first month the measurements are made;

 

(3) The solvent level within the machine must be returned to the same fill-line each month, immediately before calculating monthly emissions; and

 

(4) The solvent cleaning machine does not have to be emptied and filled with fresh unused solvent before the calculations.

 

(b) Using the records of all solvent additions and deletions for the previous monthly reporting period, determine solvent emissions using one (1) of the following equations:

 

(1) For cleaning machines with a solvent/air interface:

 

 

where:

 

E = the total halogenated HAP solvent emissions

from the solvent cleaning machine during the

most recent monthly reporting period

(kilograms of solvent per square meter of

solvent/air interface area per month); 

 

SA = the total amount of halogenated HAP liquid solvent added to the solvent cleaning machine during the most recent monthly reporting period (kilograms of solvent per month);

 

LSR = the total amount of halogenated HAP liquid solvent removed from the solvent cleaning machine during the most recent monthly reporting period (kilograms of solvent per month); 

 

SSR = the total amount of halogenated HAP solvent removed from the solvent cleaning machine in solid waste during the most recent monthly reporting period (kilograms of solvent per month) determined from tests conducted using EPA reference method 25d or by engineering calculations included in the compliance report; 

 

Area = the solvent/air interface area of the solvent cleaning machine (square meters); or

 

(2) For cleaning machines without a solvent/air interface:

 

E = SA-LSR-SSR

where:

E = the total halogenated HAP solvent emissions from the solvent cleaning machine during the most recent monthly reporting period (kilograms of solvent per month);

 

SA = the total amount of halogenated HAP liquid solvent added to the solvent cleaning machine during the most recent monthly reporting period (kilograms of solvent per month); 

 

LSR = the total amount of halogenated HAP liquid solvent removed from the solvent cleaning machine during the most recent monthly reporting period (kilograms of solvent per month); 

 

SSR = the total amount of halogenated HAP solvent removed from the solvent cleaning machine in solid waste during the most recent monthly reporting period (kilograms of solvent per month) determined from tests conducted using EPA reference method 25d (40 C.F.R. § 60) or by engineering calculations included in the compliance report; and

 

(c) Determine the monthly rolling average, EA, for the three (3) month period ending with the most recent reporting period using one (1) of the following equations:

 

(1) For cleaning machines with a solvent/air interface:

 

 

where:

 

EA = the average halogenated HAP solvent emissions

over the preceding three (3) monthly reporting

periods, (kilograms of solvent per square meter

of solvent/air interface area per month);

 

E = halogenated HAP solvent emissions for each month (j) for the most recent three (3) monthly reporting periods (kilograms of solvent per square meter of solvent/air interface area); 

 

j=1 = the most recent monthly reporting       period;

 

j=2 = the monthly reporting period immediately before j=1;

 

j=3 = the monthly reporting period immediately before j=2; or

 

(2) For cleaning machines without a solvent/air interface:

 

 

where:

 

EA = the average halogenated HAP solvent emissions over the preceding three (3) monthly reporting periods (kilograms of solvent per month); 

 

E = halogenated HAP solvent emissions for each month (j) for the most recent three (3) monthly reporting periods (kilograms of solvent per month);

 

j=1 = the most recent monthly reporting period;

 

j=2 = the monthly reporting period immediately before j=1; 

 

j=3 = the monthly reporting period immediately before j=2.

 

authority

The Director of the District Department of the Environment (DDOE or Department), pursuant to the authority set forth in sections 5 and 6(b) of the District of Columbia Air Pollution Control Act of 1984, as amended, effective March 15, 1985 (D.C. Law 5-165 (DCAPC); D.C. Official Code §§ 8-101.05 and 8-101.06(b)(2008 Repl.)), section 107(4) of the District Department of the Environment Establishment Act of 2005, effective February 15, 2006 (D.C. Law 16-51; D.C. Official Code § 8-151.07(4)(2008 Repl.)), Mayor's Order 98-44, dated April 10, 1998, and Mayor’s Order 2006-61, dated June 14, 2006.

source

Notice of Final Rulemaking published at 58 DCR 11286, 11384 (December 30, 2011).