(Adopted February 7, 1986)(Amended December 4, 2009)

RULE 1112.1. EMISSIONS OF PARTICULATE MATTER AND CARBON 

MONOXIDE FROM CEMENT KILNS 

(a) Definitions 

 For the purpose of this rule, the following definitions shall apply: 

(1) Kiln Feed means all materials except fuels entering the kiln, including raw 

feed and recycle dust, measured on a dry basis. 

(2) Cement Kiln is a device for the calcining and clinkering of limestone, 

clay, other raw materials and recycle dust in the dry-process manufacture 

of gray cement. 

(3) Clinker is a mass of fused material produced in a cement kiln from which 

the finished cement is manufactured by milling and grinding. 

(4) Clinker Cooler is a device for the air-cooling of clinker, into which the 

clinker is discharged from the cement kiln. 

(b) Requirements 

(1) No person shall operate a cement kiln and clinker cooler capable of 

discharging particulate matter into the atmosphere unless such discharge 

of particulate matter into the atmosphere from such cement kiln and 

clinker cooler when combined is limited to no more than: 

(A) 0.40 pound per ton of kiln feed for kiln feed rates less than 75 tons 

per hour. 

(B) 30 pounds per hour for kiln feed rates of 75 tons per hour or 

greater. 

(2) No person shall operate a cement kiln capable of emitting carbon 

monoxide (CO) into the atmosphere unless the CO concentration is 

limited to no more than: 

(A) the limit of Rule 407(a)(1); or 

(B) 1,900 ppm averaged over eight (8) consecutive hours and 6,000 

ppm averaged over fifteen (15) consecutive minutes, both 

corrected to 3% oxygen (O2) by volume, and measured on a dry 

basis. 

1112.1 - 1 
Rule 1112.1 (Cont) (Amended December 4. 2009) 

(c) Compliance Determination 

(1) For the purposes of this rule, particulate matter emissions from the cement 

kiln and clinker cooler shall be measured concurrently and shall be 

averaged over one hour. 

(2) Measurement of particulate matter emissions from the clinker cooler shall 

provide for the evaporation and heating of any impinger solutions at a 

temperature of at least 800oC for at least 30 minutes prior to weighing. 

(3) Measurement of particulate matter emissions from the cement kiln shall 

provide for concurrent measurement of particulate matter emissions and 

sulfur dioxide emissions. Any measured gaseous sulfur dioxide emissions 

shall be excluded from the measurement of particulate matter emissions 

by subtracting from the mass of material collected in any impingers a 

mass equivalent to the amount of measured sulfur dioxide emissions based 

upon sulfuric acid dihydrate. 

(4) Measurement, monitoring and recordkeeping of carbon monoxide (CO) 

emissions from the cement kiln shall be conducted according to the 

provisions of District Rule 218 – Continuous Emission Monitoring. 

(5) A District approved Continuous Emissions Monitoring System (CEMS) 

for carbon monoxide (CO) and oxygen (O2) must be installed no later than 

December 31, 2009, or prior to commencement of operation for sources 

beginning operation after December 4, 2009, and operated according to 

the provisions of District Rule 218 – Continuous Emission Monitoring. 

(6) The CEMS certification tests and other sampling, analysis, and reporting 

shall be conducted by a laboratory that has been approved under the 

District Laboratory Approval Program (LAP) for the cited District 

reference test methods, where LAP approval is available. For District 

reference test methods for which no LAP program is available, the LAP 

approval requirement shall become effective one year after the date that 

the LAP program becomes available 

(d) Test Methods 

(1) Carbon Monoxide emission concentration shall be determined according 

to the procedures in District Source Test Method 100.1 – Instrumental 

Analyzer Procedures for Continuous Gaseous Emission Sampling. 

1112.1 - 2 
Rule 1112.1 (Cont) (Amended December 4. 2009) 

1112.1 - 3 

(2) Particulate matter emissions shall be determined according to the 

procedures in District Source Test Method 5.3 – Determination of 

Particulate Matter from Stationary Sources Using an In-Stack Filter. 

(3) Other test methods may be used as determined to be equivalent and 

approved before the test in writing by the Executive Officer, the California 

Air Resources Board, and the United States Environmental Protection 

Agency. 

(e) Exemptions 

Cement kilns and clinker coolers subject to the provisions of this rule shall be 

exempt from the provisions of Rule 404 and Rule 405.