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(Adopted November 4, 2005)(Amended March 6, 2009)

RULE 1156. FURTHER REDUCTIONS OF PARTICULATE EMISSIONS FROM 

CEMENT MANUFACTURING FACILITIES

(a) Purpose

The purpose of this rule is to further reduce particulate matter (PM) emissions from cement 

manufacturing facilities.

(b) Applicability

This rule applies to all operations, materials handling, and transport at a cement manufacturing 

facility, including, but not limited to, kiln and clinker cooler, materialstorage, crushing, drying, 

screening, milling, conveying, bulk loading and unloading systems, internal roadways, material 

transport, and track-out. 

(c) Definitions

(1) BAG LEAK DETECTION SYSTEM (BLDS) means a system that meets the minimum 

requirements specified under U.S. EPA 40 CFR Part 63, Subpart LLL, Section 1350 

(m) to continuously monitor bag leakage and failure.

(2) CEMENT MANUFACTURING FACILITY means any facility that engages in, or has 

been engaged in prior to November 4, 2005, producing portland cement or associated 

products, as defined in the Standard Industrial Classification Manual as Industry No. 

3241, Portland Cement Manufacturing.

(3) CHEMICAL DUST SUPPRESSANT means any non-toxic chemical stabilizer which is 

used as a treatment material to reduce fugitive dust emissions and its use is not 

prohibited by any other applicable law and meets all applicable specifications required 

by any federal, state, or local water agency.

(4) CLINKER means a product from the kiln which is used as a feedstock to make 

cement.

(5) CLINKER COOLER means equipment into which clinker product leaving the kiln is 

placed to be cooled by air supplied by a forced draft or natural draft supply system.

(6) CONVEYING SYSTEM means a device for transporting materials from one piece of 

equipment or location to another piece of equipment or location within a facility. 

Conveying systems include, but are not limited to, the following: feeders, belt conveyors, 

bucket elevators and pneumatic systems.

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(7) CONTINUOUS OPACITY MONITORING SYSTEM (COMS) means a system 

that meets minimum requirements specified under U.S. EPA 40 CFR Part 60, 

Appendix B, to continuously monitor opacity.

(8) CONVEYING SYSTEM TRANSFER POINT means a point where any material 

including, but not limited to, feed material, fuel, clinker or product, is transferred to or 

from a conveying system, or between separate parts of a conveying system.

(9) COVERED CONVEYOR is a conveyor where the top and side portion of the 

conveyor are covered by a removable cover to allow routine inspection and

maintenance.

(10) DUST SUPPRESSANTS are water, hygroscopic materials, or chemical stabilizers 

used as a treatment material to reduce fugitive dust emissions.

(11) ENCLOSED CONVEYOR is any conveyor where the top, side and bottom portion of 

the conveyor system is enclosed except for points of loading and discharge and except 

for a removable cover to allow routine inspection and maintenance. 

(12) ENCLOSED SCREENING EQUIPMENT means screening equipment where the top 

portion of the equipment is enclosed, except for the area where the materials are loaded 

to the screening equipment.

(13) ENCLOSED STORAGE PILE means any storage pile that is completely enclosed in a 

building or structure consisting of a solid roof and walls.

(14) END OF WORK DAY means the end of a working period that may include one or 

more work shifts, but no later than 8 p.m.

(15) EXISTING EQUIPMENT means any equipment, process or operation having an 

existing valid AQMD permit that was issued prior to November 4, 2005.

(16) FACILITY means any source or group of sources or other air contaminant-emitting 

activities which are subject to this rule and are located on one or more contiguous 

properties within the AQMD, in actual physical contact or separated solely by a public 

roadway or other public right-of-way, and are owned or operated by the same person 

(or by persons under common control), or an outer continental shelf (OCS) source as 

determined in 40 CFR Section 55.2. Such above -described groups, if noncontiguous, 

but connected only by land carrying a pipeline, shall not be considered one facility. 

Sources or installations involved in crude oil and gas production in Southern California 

Coastal or OCS Waters and transport of such crude oil and gas in Southern California 

Coastal or OCS Waters shall be included in the same fa cility which is under the same 

ownership or use entitlement as the crude oil and gas production facility on-shore.

(17) FINISH MILL means a roll crusher, ball and tube mill or other size reduction

equipment used to grind clinker to a fine powder. Gypsum and other materials may be 
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added to and blended with clinker in a finish mill. The finish mill also includes the air 

separator associated with the finish mill.

(18) HAUL TRUCK means a diesel heavy-duty truck that has a loading capacity equal to or 

greater than 50 tons.

(19) INACTIVE CLINKER PILE is a pile of clinker material that has not been disturbed, 

removed, and/or added to as a result of loading, unloading, and/or transferring activities 

for 30 (thirty) consecutive days.

(20) KILN means a device, including any associated preheater or precalciner devices that 

produce clinker by heating limestone and other materials for subsequent production of 

portland cement.

(21) OPEN STORAGE PILE is any accumulation of materials which attains a height of three 

(3) feet or more or a total surface area of one hundred fifty (150) square feet or more. 

The open pile is defined as inactive when loading and unloading has not occurred in the 

previous 30 consecutive days.

(22) OPERATOR means the operator of the cement manufacturing facility subject to this 

rule unless otherwise specified.

(23) PAVED ROAD means a road improved by covering with concrete, asphaltic concrete, 

recycled asphalt, or asphalt.

(24) RAW MILL means a ball, tube, or vertical roller mill or other size reduction equipment 

used to grind materials to the appropriate size. Moisture may be added or removed 

from the materials during the grinding operation. A raw mill may also include a raw 

material dryer and/or air separator.

(25) ROAD means any route with evidence of repeated prior travel by vehicles.

(26) STABILIZED SURFACE means any previously disturbed surface area or open

storage pile which, through the application of dust suppressants, shows visual or other 

evidence of surface crusting, is resistant to being the source of wind-driven fugitive dust, 

and is demonstrated to be stabilized by the applicable test methods contained in the 

Rule 403 Implementation Handbook.

(27) STREET SWEEPER is a PM10 efficient street sweeper approved pursuant to Rule 

1186 – PM10 Emissions from Paved and Unpaved Roads & Livestock Operations.

(28) TOP PROCESS PARTICULATE EMITTERS means:

(A) process equipment, including but not limited to the kiln, clinker cooler, raw mill, 

and finish mill, vented to air pollution control equipment, except open-top 

baghouses, that account for 60% of the total process particulate emissions at 

Deleted: (19)

Deleted: (20)

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Deleted: (21)

Deleted: (22)

Deleted: (23)

Deleted: (24)

Deleted: (25)

Deleted: (26)

Deleted: (27)
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the facility, for the requirement of using BLDS or COMS under paragraph 

(e)(2); or

(B) process equipment, including but not limited to the kiln, clinker cooler, raw mill, 

and finish mill, vented to air pollution control equipment, that account for 80% 

of the total process particulate emissions at the facility for the monitoring, source 

testing and recordkeeping requirements under paragraph (e)(3), (e)(8) and 

subparagraph (f)(2)(D).

(29) TRACK-OUT means any material that adheres to and agglomerates on the exterior 

surface of motor vehicles, haul trucks, and equipment (including tires) that has been 

released onto a paved road and can be removed by a vacuum sweeper or a broom 

sweeper under normal operating conditions.

(30) VERIFIED FILTRATION PRODUCT means filtration products that are verified under 

the U.S. EPA Environmental Technology Verification program (ETV).

(31) WET SUPPRESSION SYSTEM means a system that supplies ultra-fine droplets of 

water or chemical dust suppressant by atomization through means of using compressed 

air or applying high pressure as specified by manufacturers to minimize dust.

(32) WIND-DRIVEN FUGITIVE DUST means particulate matter emissions from any 

disturbed surface area which is generated by wind action alone.

(33) WIND FENCE means a system consisting of a stand alone structure supporting a wind 

fence fabric. The wind fence fabric shall have maximum porosity of 20%. 

(d) Requirements

The operator shall comply with the following requirements unless otherwise stated.

(1) Visible Emissions

(A) The operator of a facility shall not cause or allow the discharge into the 

atmosphere of visible emissions exceeding 10 percent opacity based on an 

average of 12 consecutive readings from any operation at the facility, except 

open piles, roadways and unpaved areas, using EPA Opacity Test Method 9.

(B) For open piles, roadways and other unpaved areas, the operator of a facility 

shall not cause or allow the discharge into the atmosphere of visible emissions 

exceeding 20 percent opacity based on an average of 12 consecutive readings; 

or 50 percent opacity based on 5 individual consecutive readings using 

SCAQMD Opacity Test Method 9B.

(C) The operator of a facility shall not cause or allow any visible dust plume from 

exceeding 100 feet in any direction from any operations at the facility.

(2) Loading, Unloading, and Transferring

Deleted: (28)

Deleted: (29)

Deleted: (30)

Deleted: generated from a primary

crusher

Deleted: (31)

Deleted: visible 

Deleted: (32)

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(A) The operator shall conduct material loading and unloading to and from trucks, 

railcars, or other modes of material transportation through an enclosed system

that is vented to SCAQMD permitted air pollution control equipment thatmeets

the requirements in paragraph (d)(6) and subparagraph (d)(1)(A) and is 

operated during loading and unloading activities. In the event the system

consists of a building, the enclosed building shall have openings with overlapping 

flaps, sliding doors or other equally effective devices, as approved by the

Executive Officer to meet the requirement in subparagraph (d)(1)(A), which 

shall remain closed, except to allow trucks and railcars to enter and leave.

(B) The operator shall cover or enclose all conveying systems and enclose all 

transfer points. During all conveying activities, the enclosed transfer points and 

enclosed conveying systems shall be vented to a permitted air pollution control 

device that meets the requirements in subparagraph (d)(1)(A) and paragraph 

(d)(6) and is operated during all conveying activities. The enclosure shall have 

access doors to allow routine inspection and maintenance.

(C) The operator shall apply dust suppressants as necessary during material loading, 

unloading, and transferring activities, and at conveying system transfer points to 

dampen and stabilize the materials transported and prevent visible dust

emissions generated to meet the requirement in subparagraph (d)(1)(A).

(D) The operator shall install and maintain as necessary dust curtains, shrouds, belt 

scrapers, and gaskets along the belt conveying system to contain dust, prevent 

spillage and carryback in order to minimize visible emissions.

(E) The operator shall use appropriate equipment including, but not limited to,

stackers or chutes, as necessary, to minimize the height from which materials fall 

into storage bins, silos, hoppers or open stock pile s and reduce the amount of 

dust generated to meet the requirements in paragraphs (d)(1) and (d)(6).

(3) Crushing, Screening, Milling, Grinding, Blending, Drying, Heating, Mixing, Sacking, 

Palletizing, Packaging, and Other Related Operations

(A) The operator shall enclose crushing, screening, milling, grinding, blending, 

drying, heating, mixing, sacking, palletizing, packaging and other related 

operations. The enclosed system shall be vented to permitted control

equipment that meets the requirements in paragraph (d)(6) and subparagraph 

(d)(1)(A). The control equipment shall be operated during these operations.

(B) In lieu of the configuration described in subparagraph (d)(3)(A), the operator of 

a primary crusher installed and operated prior to November 4, 2005 may use 

wind fences on at least two sides of the primary crusher with one side facing the 

Deleted: T he covered or enclosed 

system

Deleted: equipment 

Deleted: ; and

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prevailing winds. The structure shall be equipped and operated with a wet

suppression system. To implement this, the operator shall submit a permit 

modification application by May 4, 2006 for a primary crusher to enable the 

Executive Officer to develop permit conditions to ensure that this air pollution 

control system is designed and operated to minimize particulate emissions. 

(C) The operator shall apply dust suppressants, as necessary, during all operations 

to dampen and stabilize the materials processed and prevent visible emissions 

generated to meet the requirements in subparagraph (d)(1)(A).

(4) Kilns and Clinker Coolers

The operator shall not operate the kilns and clinker coolers unless the kilns and clinker 

coolers are vented to air pollution control equipment that meets the requirements in 

paragraph (d)(6) and subparagraph (d)(1)(A).

(5) Material Storage

(A) An operator that stores raw materials and products in a silo, bin or hopper shall

vent the silo, bin or hopper to an air pollution control device that meets the 

requirements in subparagraph (d)(1)(A) and paragraph (d)(6).

(B) No later than September 8, 2009, the operator shall conduct all clinker

material storage and handling in an enclosed storage area that meets the 

requirements in subparagraph (d)(1)(A) and paragraph (d)(6). The enclosed 

storage area shall have opening(s) covered with overlapping flaps, and sliding

door(s) or other equivalent device(s) approved by the Executive Officer, which 

shall remain closed at all times, except to allow vehicles to enter or exit. Prior 

to the completion and operation of the enclosure, all clinker materials shall be 

stored and handled in the same manner as non-clinker materials as set forth in 

subparagraph (d)(5)(D).

(C) If clinker material storage and handling activities occur more than 1,000 feet

from, and inside, the facility property-line, the operator may comply with all of 

the following in lieu of the requirements of subparagraph (d)(5)(B) no later than 

September 8, 2009: 

(i) Utilize a three-sided barrier with roof, provided the open side is

covered with a wind fence material of a maximum 20% porosity, 

allowing a removable opening for vehicle access. The removable wind 

fence for vehicle access may be removed only during minor or routine 

maintenance activities, the creation or reclamation of outside storage 

piles, the importation of clinker from outside the facility, and reclamation 

of plant clean-up materials. The removable opening shall be less than 

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18 pt, Numbered+ Level:3 +

NumberingStyle:A ,B, C , ... + Start

at: 3 + Alignment:Left + Alignedat:

1.38" + Tab after: 1.63" + Indent at:

1.63",Tabs:Not at 1.63"

Deleted: , as necessary,

Deleted: (six months from date of 

adoption)

Deleted: December 31, 2006, or no 

later than one (1) calendar year from 

the date the following thresholds are 

exceeded,

Deleted: store clinker 

Deleted: By

Deleted: if the

Deleted: total area for open clinker 

storage at the facility is more than 

four

Deleted: (4) acres, or if t he facility 

cumulative 12-month rolling average

Deleted: loading/unloading rate of 

clinker (or processing rate of clinker) 

is

Deleted: more than 80,000 tons per 

month.

Deleted: or

Deleted: ,

Deleted: date

Deleted: enclos ed storage area

Deleted: storage area

Deleted: , the operator shall comply 

with the requirements

Deleted: C

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adoption):
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50% of the total surface area of the wind fence and the amount of time 

shall be minimized to the extent feasible;

(ii) Storage and handling of material that is immediately adjacent to the 

three-sided barrier due to space limitations inside the structure shall be

contained within an area next to the structure with a wind fence on at 

least two sides, with at least a 5 foot freeboard above the top of the 

storage pile to provide wind sheltering, and shall be completely covered 

with an impervious tarp, revealing only the active disturbed portion 

during material loading and unloading activities;

(iii) Storage and handling of other active clinker material shall be conducted 

within an area surrounded on three sides by a barrier or wind fences

with one side of the wind fence facing the prevailing wind and at least a 

5-foot freeboard above the top of the storage pile to provide wind 

sheltering. The clinker shall remain completely covered at all times with 

an impervious tarp, revealing only the active disturbed portion during

material loading and unloading activities. The barrier or wind fence shall 

extend at least 20 feet beyond the active portion of the material at all 

times; and

(iv) Inactive clinker material may be alternatively stored using a continuous 

and impervious tarp, covered at all times, provided records are kept

demonstrating the inactive status of such stored material.

(D) For active open non-clinker material storage and handling, the operator shall 

comply with one of the following to meet the requirements of subparagraphs 

(d)(1)(B) and (d)(1)(C):

(i) Apply chemical dust suppressants to stabilize the entire surface area of 

the pile, except for areas of the pile that are actively disturbed during 

loading and unloading activities; or

(ii) Install and maintain a three-sided barrier or wind fences with one side 

facing the prevailing winds and with at least two feet of visible freeboard 

from the top of the storage pile to provide wind sheltering, maintain 

surface stabilization of the entire pile in a manner that meets the

performance standards of subparagraphs (d)(1)(B) and (d)(1)(C), and 

store the materials completely inside the three-sided structure at all 

times; or

(iii) Install and maintain a three-sided barrier with roof, or wind fences with 

roof, to provide wind sheltering; maintain the open-side of the storage 

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Deleted: (C)

Deleted: piles that do don’t meet the 

criteria in subparagraph (d)(5)(B)

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pile stabilized in a manner that meets the performance standards of 

subparagraphs (d)(1)(B) and (d)(1)(C), and store the materials

completely inside the three-sided structure at all times; or

(iv) Install and maintain a tarp over the entire surface area of the storage 

pile, in a manner that meets the performance standards of

subparagraphs (d)(1)(B) and (d)(1)(C), except for areas of the pile that 

are actively disturbed during loading and unloading activities. The tarp 

shall remain in place and provide cover at all times. 

(E) All inactive non-clinker piles shall be stored and handled in the same manner as 

non-clinker materials, as set forth in subparagraph (d)(5)(D). The operator 

shall keep records demonstrating the inactive status of the non-clinker piles.(F)

For open storage piles subject to subparagraph (d)(5)(D), the operator 

shall apply chemical dust suppressants or dust suppressants during any material 

loading and unloading to/from the open piles; and re-apply chemical dust 

suppressants or dust suppressants to stabilize the disturbed surface areas of the 

open piles at the end of each work day in which loading and unloading activities 

were performed to meet the performance standards of subparagraphs (d)(1)(B) 

and (d)(1)(C) .

(6) Air Pollution Control Device

(A) The operator shall install and maintain an air pollution control system referred to 

in paragraphs (d)(2), (d)(3), (d)(4) and (d)(5) to meet the following

performance standards measured with the approved source test in subdivision 

(g):

(i) an outlet concentration of 0.01 grain PM per dry standard cubic feet 

for equipment installed prior to November 4, 2005; and

(ii) a BACT outlet concentration not to exceed 0.005 grain PM per dry 

standard cubic feet for equipment installed on and after November 4, 

2005.

(B) The operator shall install and maintain a baghouse ventilation and hood system 

that meets a minimum capture velocity requirement specified in the applicable 

standards of the U.S. Industrial Ventilation Handbook, American Conference of 

Governmental Industrial Hygienists, at the time of installation. If modification to 

the baghouse ventilation and hood system is required to meet the applicable 

standard, the operator shall be granted additional time up to December 31, 

2006 to complete this process.

Deleted: (D)

Deleted: By February 2, 2006, the 

operator shall comply with one of the 

requirement in subparagraph (d)(5)(C)

for all inactive open storage piles. 

The operator shall keep records to 

demonstrate status of inactivity.¶

(E)

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(C) The operator shall meet the requirements in paragraph (d)(6) by December 31, 

2006 for pulse-jet baghouses, and by December 31, 2010 for non-pulse-jet

baghouses.

(D) To show incremental progress towards the December 31, 2010 compliance 

date for non-pulse-jet baghouses, the operator shall submit to the Executive 

Officer a list of baghouse candidates for future modification or replacement by 

December 31, 2006. In addition, the operator shall submit a notification letter 

by December 31 of each year thereafter, starting in 2006, to demonstrate that 

the operator has completed at least 20% of the modification or replacement by 

2006; 40% by 2007; 60% by 2008, 80% by 2009; and 100% by 2010. 

(7) Internal Roadways and Areas

(A) Unpaved Roadways and Areas

(i) For haul roads used by haul trucks to carry materials from the quarry to 

different locations within the facility, the operator shall apply chemical 

dust suppressants in sufficient quantity and at least twice a year to 

stabilize the entire unpaved haul road surface; post signs at the two ends 

stating that haul trucks shall use these roads unless traveling to the 

maintenance areas; and enforce the speed limit of 35 miles per hour or 

less to comply with the opacity limits in paragraph (d)(1).

(ii) For other unpaved roadways and areas, the operator shall apply

chemical dust suppressants in sufficient quantity and at least twice a year 

to stabilize the surface, or apply gravel pad containing 1-inch or larger 

washed gravel to a depth of six inches; and enforce a speed limit of 15

miles per hour or less to comply with the opacity limits in paragraph 

(d)(1).

(B) Paved Roads

The operator shall sweep all internal paved roads at least once each regular 

work day or more frequently if necessary to comply with the opacity limits in 

paragraph (d)(1). Sweeping frequency may be reduced on weekends, 

holidays, or days of measurable precipitation provided that the operator 

complies with the opacity limits in paragraph (d)(1) at all times. Sweepers 

purchased or leased after November 4, 2005 shall be Rule 1186-certified 

sweepers.

(8) Track-Out

(A) The operator shall pave the closest 0.25 miles of internal roads leading to the 

public roadways and ensure that all trucks use these roads exclusively when 

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leaving the facility to prevent track-out of dust to the public roadways and to 

comply with the opacity limits in paragraph (d)(1).

(B) If necessary to comply with the opacity limits in paragraph (d)(1), the operator 

shall install a rumble grate, truck washer, or wheel washer; and ensure that all 

trucks go through the rumble grate, truck washer or wheel washer such that the 

entire circumference of each wheel or truck is cleaned before leaving the facility.

(C) To prevent material spillage from trucks to public roadways and fugitive dust 

emissions during transport, a truck driver on the facility shall ensure that the 

cement truck hatches are closed and there is no track-out, and the operator 

shall provide truck cleaning facilities on-site.

(D) The operator shall provide, at least once each calendar year, the “Fugitive Dust 

Advisory” flyers prepared by the District to any company doing business with 

the facility and which is subject to the requirements in subparagraph (d)(8)(C).

(9) No Backsliding

To prevent any backsliding from the current level of control, the operator shall operate 

and maintain all existing equipment according to permit conditions stated in the permits 

approved by the Executive Officer prior to November 4, 2005 at all times.

(10) Compliance Monitoring Plan

(A) No later than June 8, 2009, , the operator shall submit to the Executive Officer 

a complete compliance plan for wind monitoring and the monitoring, sampling, 

and analysis of hexavalent chromium, and pay a plan evaluation fee pursuant to 

Rule 306 – Plan Fees. The submitted plan will be disapproved if it does not 

meet the provisions of subparagraph (d)(10)(B). The operator shall resubmit an 

approvable plan within 30 days from date of disapproval; otherwise, the 

operator shall be deemed in violation of this provision.

(B) The monitoring plan submitted shall contain, at a minimum, the following:

(i) Siting and monitoring protocols that comply with EPA’s and CARB’s 

guidance and/or protocols for measurement of hexavalent chromium, 

wind direction, and wind speed. A minimum of three fence-line 

monitoring stations are required for hexavalent chromium: one upwind 

and one downwind of the facility under the common prevailing wind 

directions, and one subject to approval by the Executive Officer to 

ensure maximum effectiveness of the monitoring to the most potentially 

affected receptor, such as nearest residential or business receptors 

relative to clinker storage areas or potential hexavalent chromium

emitting sources. 

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(ii) Breakdown provisions which include: (1) a statement that the operator 

will notify the Executive Officer in writing of the breakdown within 24 

hours of its occurrence. If the breakdown occurs on a Friday, over a 

weekend, or on a national or state holiday observed by the facility, the 

facility shall report such breakdown on the following work day; (2) a 

repair schedule; and (3) an action plan with detailed measures to be 

taken by the operator to ensure that there will be at least 70% data 

capture at each site by each monitoring system;

(iii) Consent from the operator that allows the Executive Officer to conduct 

any co-located or audit sampling at any time; 

(iv) Sampling analysis protocols that comply with EPA and CARB’s 

appropriate guidance and/or protocols for hexavalent chromium. All 

samples shall be analyzed at a District-approved laboratory, which can 

be audited at any time; and

(v) Any other relevant data and information required by the Executive 

Officer.

(C) The Executive Officer shall approve or disapprove the complete plan within 60 

days from the submittal date.

(D) The operator may file for a compliance monitoring plan amendment in the future 

relative to monitor siting or other elements of the plan as more site-specific data 

becomes available.

(11) Hexavalent Chrome Monitoring and Other Requirements

No later than six months from compliance plan approval or March 1, 2010, whichever 

occurs first, the operator of a cement manufacturing facility shall conduct hexavalent 

chromium ambient air monitoring as follows:

(A) The operator shall conduct ambient air monitoring for hexavalent chromium in 

accordance with the approved monitoring plan set forth in subparagraph

(d)(10)(B) or (d)(10)(D), as applicable . The hexavalent chromium

concentration from a 30-day rolling average at each monitoring station shall not 

exceed 0.70 nanograms per cubic meter (ng/m3), excluding background. 24-

hour sampling shall be conducted once every third day according to the EPA 1-

in-3-day sampling calendar. For monitoring sample retrieval in which collection 

occurs on a weekend or facility observed national or state holiday, the sample 

may be collected the following business day. 

(B) The operator may conduct 24-hour sampling once every six days for hexavalent 

chromium if there is no single exceedance of the 0.70 ng/m3level during 12

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continuous months of monitoring. On this sampling schedule, the hexavalent 

chromium concentration from a 90-day rolling average at each monitoring 

station shall not exceed 0.70 ng/m3, excluding background. If there is an 

exceedance while on this sampling schedule, sampling shall immediately revert 

back to once every three days. For monitoring sample retrieval in which 

collection occurs on a weekend or facility observed national or state holiday, 

the sample may be collected the following business day.

(C) For facilities that elect to comply with (d)(5)(C), any exceedance of the 

concentrations listed in clauses (d)(11)(A) or (d)(11)(B) will require enclosure 

of all clinker materials storage and handling if the Executive Officer confirms,

through wind event monitoring data, that the cement manufacturing facility is the 

source of violation. The facility operator may select one of the following 

enclosure schedule: 25% of the facility’s five-year annual average clinker 

material stored and handled, by weight, no later than 12 months from the date 

of the exceedance; and an incremental 25% per subsequent year until

completion; or complete the total enclosure within 24 months from the date of 

exceedance.

(12) Particulate Matter (PM10) Monitoring and Other Requirements

The operator of the cement manufacturing facility who accrues three or more approved

notices of violation for an exceedance of the upwind/downwind level specified in Rule 

403 within a 36-month period shall conduct PM10 ambient air monitoring. An 

amendment to the compliance monitoring plan to include PM10 monitoring protocols 

and procedures shall be filed within 90 days of the date of the third approved notice of 

violation. The monitoring equipment shall be installed and operated within 6 months 

from the date of modified plan approval and no later than one year from the date of the 

third approved notice of violation.

(A) The operator shall conduct continuous and real-time ambient air monitoring for 

PM10, using a continuous monitoring system, in accordance with a monitoring 

plan approved by the Executive Officer in a manner as set forth in 

subparagraphs (d)(10)(B) or (d)(10)(D), as applicable. The differences of 

PM10 concentrations from any two monitoring sites which represent upwind 

and downwind concentrations shall not exceed the amount and averaging time 

period specified in Rule 403.

(B) The operator shall apply dust suppressants on all openly stored non-clinker 

materials, unpaved roads, and unpaved areas within the facility, as well as take 

steps to decrease clinker dust, if the PM10 difference(s) set forth in Rule 403

are exceeded at any time.

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(13) Wind Monitoring

(A) No later than September 8, 2009, the operator shall install and operate wind 

monitoring equipment to conduct hourly wind monitoring according to a

protocol approved by the Executive Officer.

(B) On and after the date of operation of the wind monitoring equipment pursuant to subparagraph 

(d)(13)(A), the operator shall cease all open handling of clinker material for a two-hour period 

in the event that instantaneous wind speeds exceed 25 miles per hour (mph), and if such wind 

speeds subsequently exceed 25 mph, a new two-hour period shall begin. During the

aforementioned two-hour period, the facility would be exempt from the requirement of

subparagraph (d)(1)(C) if the open handling of clinker material is ceased, provided that dust 

controls as required by District rules are applied; and unpaved roads are stabilized upon register

of the high wind event via the wind monitoring equipment. (e) Monitoring and Source Testing 

(1) For the kilns and clinker coolers, the operator shall continuously monitor and record 

operating parameters including, but not limited to, flue gas flow rates and pressure drops 

across the baghouses to monitor baghouse performance and ensure compliance with the 

opacity limit in subparagraph (d)(1)(A).

(2) For all new baghouses greater than or equal to 10,000 actual cubic feet per minute, and 

for all existing bahouses of the top process particulate emitters as defined under 

subparagraph (c)(28)(A), the operator shall install, operate, calibrate and maintain a 

COMS or BLDS to monitor baghouse performance and ensure compliance with the 

opacity limit in subparagraph (d)(1)(A).

(3) The operator shall conduct visible emission observations with EPA Method 22 for 

process equipment equipped with air pollution control equipment at the following 

frequency:

(i) Weekly for top process particulate emitters defined under subparagraph

(c)(28)(B) that are not equipped with BLDS or COMS;

(ii) Monthly for top process particulate emitters defined under subparagraph

(c)(28)(B) that are equipped with BLDS or COMS; and

(iii) Monthly for other process equipment. 

(4) The operator shall monitor and record pertinent operating parameters, such as pressure 

drops, according to the Operation and Maintenance Procedure in paragraph (e)(12) to 

monitor the performance of air pollution control equipment and ensure compliance with 

the opacity limit in subparagraph (d)(1)(A).

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(5) If the operator receives an alarm from the BLDS, or COMS, the operator shall 

immediately conduct an EPA Method 22 test and implement all necessary corrective 

actions to minimize emissions. 

(6) If the operator observes visible emissions during any EPA Method 22 test, the operator 

shall immediately implement all necessary corrective actions to minimize emissions, and 

conduct EPA Method 9 test within one hour of any observation of visible emissions.

(7) For the kilns and clinker coolers, the operator shall conduct an annual compliance 

source test in accordance with the test methods in subdivision (g) to demonstrate 

compliance with the emission limit(s) in subdivision (d). The first annual compliance 

source test in accordance with an approved source test protocol shall be conducted 

within ninety (90) calendar days after the compliance date specified in subdivision (d). 

The operator shall submit a source test protocol to the Executive Officer no later than 

sixty (60) calendar days prior to the proposed test date for the Executive Officer's 

approval for the first compliance source test. The testing frequency may be reduced to 

once every 24 calendar months if the two most recent consecutive annual source tests 

demonstrate compliance with the limits. Upon notification by the Executive Officer, the 

testing frequency shall be reverted back to annual testing if any subsequent source test 

fails to demonstrate compliance with the limits. In lieu of annual testing, any operator 

who elects to use all verified filtration products in its baghouses shall conduct a 

compliance test every five years.

(8) By February 4, 2006, the operator shall provide the Executive Officer a list of the top 

process particulate emitters as defined under subparagraph (c)(28)(B), and the

proposed testing schedule for these equipment. The operator shall conduct compliance 

source tests on representative baghouses within each process system and submit test 

results for these processes every 5 years, with at least two source tests conducted in 

any calendar year. If there are any changes to the list of equipment to be tested or the 

testing schedule, the operator shall notify the Executive Officer 60 calendar days before 

the test date. 

(9) The operator shall not be required to test non-operational equipment, which is not in 

operation for at least 6 consecutive months prior to scheduled testing, as indicated in 

paragraph (e)(8) provided that the operator shall conduct such test within one month 

after resuming operation.

(10) During any compliance source test, the operator shall monitor and record, at a

minimum, all operating data for the selected operating parameters of the control 

equipment and the process equipment and submit this data with the test report.

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(11) The operator shall submit a complete test report for any compliance source test to the 

Executive Officer no later than sixty (60) calendar days of completion of the source test.

(12) Operation and Maintenance Procedures

(A) The operator shall develop and implement an Operation and Maintenance 

Procedure to ensure that the performance of the air pollution control equipment 

is continuously maintained and operated. The Operation and Maintenance 

Procedure shall include, at a minimum, information on monitoring and 

recordkeeping procedures, routine maintenance procedures, corrective and 

preventive actions for the air pollution control equipment, and training related to 

EPA Method 22, EPA Opacity Test Method 9 and SCAQMD Opacity Test 

Method 9B, and other applicable information to demonstrate compliance with 

this rule. 

(B) The operator shall develop and implement an Operation and Maintenance 

Procedure that would require sufficient maintenance of internal roadways and 

areas, prompt cleanup of any pile of material spillage or carry-back, and 

application of chemical dust suppressant or other dust control methods to 

maintain surface stabilization of the open piles, spillage and carry-back to ensure 

compliance with the opacity standards in paragraph (d)(1) at all times. 

(C) The operator shall develop and maintain the Operation and Maintenance

Procedures described under subparagraphs (e)(12)(A) and (e)(12)(B) within 6 

months after November 4, 2005, and shall make the Operation and

Maintenance Procedures available to the Executive Officer upon request.

(f) Reporting and Recordkeeping

(1) The operator shall maintain all records and information required to demonstrate

compliance with the provisions of this rule in a manner approved by the Executive 

Officer for a period of at least five years which shall be made available to the Executive 

Officer upon request.

(2) The operator of a facility shall keep, at a minimum, the following records to demonstrate 

compliance:

(A) Daily records of applying chemical dust suppressants, watering, sweeping and 

cleaning activities;

(B) Appropriate records, on at least a monthly basis, for primary crushers, kilns, 

raw mills, and finish mills, production records of clinkers and cements and 

records of raw materials delivered to the facility in order to determine emissions;

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(C) Test reports to demonstrate compliance with the emission standards in

subdivision (d) including, but not limited to, PM emission rates, and opacity 

readings; 

(D) Records of equipment malfunction and repair for the air pollution control 

equipment of the top process particulate emitters specified under subparagraph 

(c)(28)(B);

(E) Daily records of all material handling, including loading and unloading, and 

storage pursuant to paragraphs (d)(2) and (d)(5);

(F) Monitoring data pursuant to subparagraphs (d)(11), and (d)(12) as applicable, 

and supporting documentation, including, but not limited to chains of custody

and laboratory results;

(G) Hourly records of wind speed and direction pursuant to subparagraph (d)(13);

(H) Records of all maintenance activities pursuant to clause (d)(5)(C)(i) and 

paragraph (h)(7), including any equipment testing after the repairs and duration 

of wind fence removal;

(I) Records of clinker pile reclamation, importation, and transport pursuant to 

clause (d)(5)(C)(i), including duration of wind fence removal; and

(J) Records of all vehicle traffic and monthly average road trips pursuant to 

paragraph (h)(4).

(3) Monitoring data shall be reported monthly to, and in an electronic format specified by,

the Executive Officer. In the event the facility operator finds that an exceedance of the 

levels specified in subparagraphs (d)(11)(A), (d)(11)(B), or (d)(12)(A) as applicable

has occurred, the operator shall report in writing such finding to the Executive Officer, 

and follow up with a phone call the next business day aftersuch finding.

(g) Test Methods and Calculation

(1) The operator shall use the following source test methods, as applicable, to determine the 

PM emission rates. All source test methods referenced below shall be the most recent 

version issued by the respective organization. All test results in units of grains/dscf shall 

be determined as before the addition of any dilution or air, if present, that was not a part 

of the stream(s) processed by the device that was tested. 

(A) SCAQMD Source Test Method 1.1 or 1.2 – Velocity and Sample Traverse 

Points;

(B) SCAQMD Source Test Method 2.1 or 2.3 – Stack Gas Flow Rate;

(C) SCAQMD Source Test Method 3.1 – Stack Gas Density;

(D) SCAQMD Source Test Method 4.1 – Stack Gas Moisture;

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(E) SCAQMD Source Test Method 5.2 or 5.3 - Determination of Particulate 

Matter Emissions in which reagent grade acetone shall be used to recover 

samples from the components of the sampling train located before the

particulate filter;

(F) EPA Source Test Method 5 with the impinger analysis may be used in lieu of 

SCAQMD Source Test Method 5.2 or 5.3.

(G) EPA Source Test Method 5D with the impinger analysis may be used to 

measure PM emissions from positive pressure fabric filters.

(2) Measurement of particulate matter emissions from the cement kiln shall provide for a 

correction of sulfur dioxide emissions collected in the particulate matter samples. 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 as specified in SCAQMD Source Test Methods 5.2 or 

5.3.

(3) Source tests for PM shall be taken and the average of the samples shall be used to 

determine the applicable emission rate in accordance with the following requirements:

(A) Simultaneous duplicate samples shall be obtained unless the operator

demonstrates to the satisfaction of the Executive Officer that it is not physically 

feasible to do so, in which case the operator shall take sequential triplicate 

samples;

(B) All samples must have minimum sampling volume of 120 cubic feet or a 

minimum PM catch of 6 milligrams per sample shall be collected;

(C) For duplicate samples, the source test shall be deemed invalid if the difference 

between the two samples is greater than 35% of the average of the two samples 

in the applicable units specified in subdivision (d) and if the difference between 

the sample catches normalized to the average sampling volume is greater than 

3.5 milligrams. If the source test is deemed invalid, the test shall be repeated; 

and

(D) For triplicate samples, upon approval of the Executive Officer or designee, if the 

operator can demonstrate that the process conditions including, but not limited 

to, the throughput, quantity, type, and quality of all feedstock to the equipment 

process, and the emission control equipment conditions have not changed 

throughout the sequential test period, then the operator may apply the Dixon 

outlier test at the 95% significance level to check for and discard one outlier, 
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and shall use the average of the two remaining samples to determine PM 

emissions.

(4) The operator may use alternative or equivalent source test methods, as defined in U.S. 

EPA 40 CFR 60.2, if they are approved in writing by the Executive Officer, the 

California Air Resources Board, and the U.S. Environmental Protection Agency.

(5) The operator shall use a test laboratory approved under the SCAQMD Laboratory 

Approval Program for the source test methods cited in this subdivision if such approved 

lab exists. If there is no approved laboratory, then approval of the testing procedures 

used by the laboratory shall be granted by the Executive Officer on a case-by-case 

basis based on appropriate SCAQMD protocols and procedures.

(6) The operator shall use the methods specified in the SCAQMD Rule 403

Implementation Handbook to determine threshold friction velocity and stabilized

surface; and EPA Opacity Test Method 9 and Method 22, or SCAQMD Opacity Test 

Method 9B to determine opacity.

(7) When more than one source test method or set of source test methods are specified for 

any testing, the application of these source test methods to a specific set of test 

conditions is subject to approval by the Executive Officer. In addition, a violation 

established by any one of the specified source test methods or set of source test 

methods shall constitute a violation of the rule.

(h) Exemptions

(1) The operator is exempt from installing a three-sided barrier or enclosure, or using the 

test methods in the SCAQMD Rule 403 Implementation Handbook for the

demonstration of surface stabilization for open storage piles if 90% of the pile’s mass

consists of materials that are larger than 1⁄2 inch. Applicability of this exemption shall be 

determined through the measurement of any composite sample of at least 10 pounds 

taken from a minimum depth of 12 inches below the pile surface, and from various 

locations in the pile, but not from within 12 inches from the base of the pile. This 

exemption is limited to open storage piles that contain only materials other than clinker, 

providing that such piles meet the performance standards in subparagraphs (d)(1)(B) 

and (d)(1)(C).

(2) The operator is exempt from the use of chemical dust suppressants for internal unpaved 

roads if the use of applicable chemical dust suppressants on that specific unpaved road 

violates the rules and/or regulations of the local Water Quality Control Board or other 

government agency provided the operator uses water in sufficient quantity and

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frequency to stabilize the road surface and the operator notifies the Executive Officer in 

writing 30 days prior to the use of water. 

(3) Haul trucks are not required to use designated roads for haul trucks if they travel on 

unpaved roads complying with the requirements in clause (d)(7)(A)(ii).

(4) The operator is exempt from the use of chemical dust suppressants in clause

(d)(7)(A)(ii) where a road is used less than a monthly average of twice a day by a 

designated vehicle at a speed limit less than 15 miles per hour.

(5) The operator is exempt from the use of chemical dust suppressants on unpaved areas 

specified in clause (d)(7)(A)(ii) during a period for demolition activities of no longer than 

six (6) calendar months provided that the operator uses water in sufficient quantity and 

frequency to stabilize the unpaved areas, meets the opacity requirements in

subparagraphs (d)(1)(B) and (C) at all times, and keeps sufficient records to 

demonstrate compliance. 

(6) With the exception of primary crushing, open material storage piles, and covers and 

existing enclosures for conveying systems, the provisions of this rule shall not apply to 

equipment or operations that are subject to Rule 1157 or Rule 1158 located at the 

cement manufacturing facilities, provided that there is no backsliding from the current 

level of control as stated in the permits approved by the Executive Officer prior to 

November 4, 2005 or as required under Rule 1157 and Rule 1158, whichever is more 

stringent.

(7) The operator is exempt from the requirements in clause (d)(5)(C)(i) in the event the 

wind fence material needs to be removed to perform periodic maintenance of the clinker 

crane or building. During the time the wind fence material is removed, the clinker crane 

shall not actively transport clinker material in the building, except for post maintenance 

equipment testing.

(8) During day(s) in which the instantaneous wind speeds exceed 25 mph using the on-site 

wind monitoring equipment pursuant to (d)(13)(A), the operator is exempt from the 

hexavalent chromium and PM10 averaging provisions of subparagraphs (d)(11)(A) and

(d)(11)(B), and (d)(12)(A) as applicable, provided all open handling of clinker material 

is ceased and dust controls are applied pursuant to subparagraph (d)(13)(B). If the 

Executive Officer determines a significant potential of re-entrained hexavalent chromium 

containing dust from the facility exists during such high wind events, the operator shall 

implement an approved Mitigation Monitoring Plan to minimize exposure to the

surrounding area and to ensure implementation of all applicable dust control measures to 

meet the requirements of subparagraphs (d)(11)(A) and (d)(11)(B), and (d)(12)(A), as 
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applicable. The Mitigation Monitoring Plan is due 90 days, inclusive of appropriate plan 

fees pursuant to Rule 306, after notification by the Executive Officer.