(Adopted May 7, 1976) (Amended November 6, 1992) (Amended July 9, 1993) (Amended February 14, 1997) (Amended December 11, 1998)(Amended April 2, 2004) (Amended June 3, 2005)

RULE 403. FUGITIVE DUST

(a) Purpose The purpose of this Rule is to reduce the amount of particulate matter entrained in the ambient air as a result of anthropogenic (man-made) fugitive dust sources by requiring actions to prevent, reduce or mitigate fugitive dust emissions.

(b) Applicability The provisions of this Rule shall appl y to any activity or man-made condition capable of generating fugitive dust.

(c) Definitions (1) ACTIVE OPERATIONS means any s ource capable of generating fugitive dust, including, but not limite d to, earth-moving activities, construction/demolition activities, disturbed surface area, or heavy- and light-duty vehicular movement. (2) AGGREGATE-RELATED PLANTS are de fined as facilities that produce and / or mix sand and gravel and crushed stone. (3) AGRICULTURAL HANDBOOK means the region-specific guidance document that has been approved by the Governing Board or hereafter approved by the Executive Officer and the U.S. EPA. For the South Coast Air Basin, the Board-approved region-specific guidance document is the Rule 403 Agricultural Handbook dated December 1998. For the Coachella Valley, the Board-approved region-specific guidance document is the Rule 403 Coachella Valley Agricultural Handbook dated April 2,

2004. (4) ANEMOMETERS are devices used to measure wind speed and direction in accordance with the performance standards, and maintenance and

calibration criteria as containe d in the most recent Rule 403 Implementation Handbook. (5) BEST AVAILABLE CONTROL ME ASURES means fugitive dust

control actions that are set fort h in Table 1 of this Rule.

403 - 1Rule 403 (cont.) (Amended June 3, 2005)

(6) BULK MATERIAL is sand, gravel, soil, aggregate material less than two inches in length or diameter, and ot her organic or inorganic particulate

matter. (7) CEMENT MANUFACTURING FACILITY is any facility that has a cement kiln at the facility. (8) CHEMICAL STABILIZERS are any non-toxic chemical dust suppressant which must not be used if prohibited for use by the Regional Water Quality Control Boards, the California Air Resources Board, the U.S. Environmental Protection Agency (U.S. EPA), or any applicable law, rule or regulation. The chemical stabi lizers shall meet any specifications, criteria, or tests required by any federa l, state, or local water agency. Unless otherwise indicated, the use of a non-toxic chemical stabilizer shall

be of sufficient concentration and a pplication frequency to maintain a

stabilized surface. (9) COMMERCIAL POULTRY RANCH me ans any building, structure, enclosure, or premises where more th an 100 fowl are kept or maintained for the primary purpose of producing e ggs or meat for sale or other

distribution. (10) CONFINED ANIMAL FACILITY mean s a source or group of sources of air pollution at an agricultural source fo r the raising of 3,360 or more fowl or 50 or more animals, including but not limited to, any structure, building, installation, farm, corral, coop, feed storage area, milking parlor, or system for the collection, storage, or distribution of solid and liquid manure; if domesticated animals, in cluding horses, sheep, goats, swine, beef cattle, rabbits, chic kens, turkeys, or ducks are corralled, penned, or

otherwise caused to remain in restri cted areas for commercial agricultural purposes and feeding is by means other than grazing. (11) CONSTRUCTION/DEMOLITION ACTIVITIES means any on-site mechanical activities conducted in preparation of, or related to, the building, alteration, rehabilitation, de molition or improvement of property, including, but not limited to the following activities: grading, excavation, loading, crushing, cutting, planing, shaping or ground breaking. (12) CONTRACTOR means any person w ho has a contractual arrangement to conduct an active operation for another person. (13) DAIRY FARM is an operation on a prope rty, or set of properties that are contiguous or separated only by a public right-of-way, that raises cows or

403 - 2Rule 403 (cont.) (Amended June 3, 2005)

produces milk from cows for the purpose of making a profit or for a livelihood. Heifer and calf farms are dairy farms. (14) DISTURBED SURFACE AREA means a portion of the earth's surface which has been physically moved, un covered, destabilized, or otherwise

modified from its undisturbed natura l soil condition, thereby increasing the potential for emission of fugitive dust. This definition excludes those

areas which have: (A) been restored to a natural state, such that the vegetative ground cover and soil characteristics are similar to adjacent or nearby natural conditions; (B) been paved or otherwise cove red by a permanent structure; or (C) sustained a vegetative ground cove r of at least 70 percent of the native cover for a particular area for at least 30 days. (15) DUST SUPPRESSANTS are water, hygroscopic materials, or non-toxic chemical stabilizers used as a treatment material to reduce fugitive dust

emissions. (16) EARTH-MOVING ACTIVITIES means the use of any equipment for any activity where soil is being moved or uncovered, and shall include, but not be limited to the following: grading, earth cutting and filling operations, loading or unloading of dirt or bulk materials, adding to or removing from open storage piles of bulk materials, landfill operations, weed abatement through disking, and soil mulching. (17) DUST CONTROL SUPERVISOR mean s a person with the authority to expeditiously employ sufficient dust mitigation measures to ensure compliance with all Rule 403 requirements at an active operation. (18) FUGITIVE DUST means any solid particulate matter that becomes airborne, other than that emitted from an exhaust stack, directly or indirectly as a result of the activities of any person. (19) HIGH WIND CONDITIONS means that instantaneous wind speeds exceed 25 miles per hour. (20) INACTIVE DISTURBED SURFACE AREA means any disturbed surface area upon which active operations have not occurred or are not expected to occur for a period of 20 consecutive days. (21) LARGE OPERATIONS means any active operations on property which

contains 50 or more acres of distur bed surface area; or any earth-moving operation with a daily earth-moving or throughput volume of 3,850 cubic

403 - 3Rule 403 (cont.) (Amended June 3, 2005)

meters (5,000 cubic yards) or more three times during the most recent 365-day period. (22) OPEN STORAGE PILE is any accu mulation of bulk material, which is not fully enclosed, covered or chemically stabilized, and which attains a height of three feet or more and a total surface area of 150 or more square

feet. (23) PARTICULATE MATTER means any material, except uncombined water, which exists in a finely divided form as a liquid or solid at standard

conditions. (24) PAVED ROAD means a public or priv ate improved street, highway, alley, public way, or easement that is covere d by typical roadway materials, but excluding access roadways that conn ect a facility with a public paved roadway and are not open to through tr affic. Public paved roads are those open to public access and that are ow ned by any federal, state, county, municipal or any other governmental or quasi-governmental agencies. Private paved roads are any pave d roads not defined as public. (25) PM 10 means particulate matter with an aerodynamic diameter smaller than or equal to 10 microns as measured by the applicable State and

Federal reference test methods. (26) PROPERTY LINE means the boundari es of an area in which either a person causing the emission or a pe rson allowing the emission has the legal use or possession of the propert y. Where such property is divided into one or more sub-tenancies, th e property line(s) shall refer to the boundaries dividing the areas of all sub-tenancies. (27) RULE 403 IMPLEMENTATI ON HANDBOOK means a guidance document that has been approved by the Governing Board on April 2, 2004 or hereafter approved by the Ex ecutive Officer and the U.S. EPA. (28) SERVICE ROADS are paved or unpa ved roads that are used by one or more public agencies for inspection or maintenance of infrastructure and which are not typically used for construction-related activity. (29) SIMULTANEOUS SAMPLING means the operation of two PM 10 samplers in such a manner that one sampler is started within five minutes of the other, and each sampler is operated for a consecutive period which

must be not less than 290 minutes and not more than 310 minutes. (30) SOUTH COAST AIR BASIN means the non-desert portions of Los Angeles, Riverside, and San Bern ardino counties and all of Orange

403 - 4Rule 403 (cont.) (Amended June 3, 2005)

County as defined in California Code of Regulations, Title 17, Section 60104. The area is bounded on the west by the Pacific Ocean, on the north and east by the San Gabriel, San Bernardino, and San Jacinto Mountains, and on the south by the San Diego county line. (31) STABILIZED SURFACE means any pr eviously disturbed surface area or open storage pile which, through the application of dust suppressants,

shows visual or other evidence of surface crusting and is resistant to winddriven fugitive dust and is demonstrated to be stabilized. Stabilization can be demonstrated by one or more of th e applicable test methods contained in the Rule 403 Implementation Handbook. (32) TRACK-OUT means any bulk material that adheres to and agglomerates

on the exterior surface of motor vehicles, haul trucks, and equipment (including tires) that have been re leased onto a paved road and can be removed by a vacuum sweeper or a broom sweeper under normal operating conditions. (33) TYPICAL ROADWAY MATERIAL S means concrete, asphaltic concrete, recycled asphalt, asphalt, or any other material of equivalent performance as determined by the Ex ecutive Officer, and the U.S. EPA. (34) UNPAVED ROADS means any unseal ed or unpaved roads, equipment paths, or travel ways that are not covered by typical ro adway materials. Public unpaved roads are any unpaved roadway owned by federal, state, county, municipal or other governmental or quasi-governmental agencies. Private unpaved roads are all other unpaved roadways not defined as public. (35) VISIBLE ROADWAY DUS T means any sand, soil, dirt, or other solid particulate matter which is visible upon paved road surfaces and which can be removed by a vacuum sweeper or a broom sweeper under normal operating conditions. (36) WIND-DRIVEN FUGITIVE DUST m eans visible emissions from any disturbed surface area which is generated by wind action alone. (37) WIND GUST is the maximum inst antaneous wind speed as measured by

an anemometer. (d) Requirements (1) No person shall cause or allow the emissions of fugitive dust from any active operation, open storage pile, or disturbed surface area such that:

403 - 5Rule 403 (cont.) (Amended June 3, 2005)

(A) the dust remains visible in the atmosphere beyond the property line of the emission source; or (B) the dust emission exceeds 20 percent opacity (as determined by the appropriate test method included in the Rule 403 Implementation Handbook), if the dust emission is the result of movement of a

motorized vehicle. (2) No person shall conduct active operati ons without utilizing the applicable

best available control measures incl uded in Table 1 of this Rule to minimize fugitive dust emissions from each fugitive dust source type within the active operation. (3) No person shall cause or allow PM 10 levels to exceed 50 micrograms per cubic meter when determined, by simu ltaneous sampling, as the difference between upwind and downwind samp les collected on high-volume particulate matter samplers or ot her U.S. EPA-approved equivalent

method for PM 10 monitoring. If sampling is conducted, samplers shall

be: (A) Operated, maintained, and calibrated in accordance with 40 Code of Federal Regulations (CFR), Pa rt 50, Appendix J, or appropriate U.S. EPA-published documents fo r U.S. EPA-approved equivalent method(s) for PM 10

. (B) Reasonably placed upwind and dow nwind of key activity areas and as close to the property line as feas ible, such that other sources of fugitive dust between the sampler and the property line are

minimized. (4) No person shall allow track-out to extend 25 feet or more in cumulative length from the point of origin from an active operation. Notwithstanding the preceding, all track-out from an active operation shall be removed at

the conclusion of each wor kday or evening shift. (5) No person shall conduct an active op eration with a disturbed surface area of five or more acres, or with a da ily import or export of 100 cubic yards

or more of bulk material without util izing at least one of the measures listed in subparagraphs (d)(5)(A) through (d)(5)(E) at each vehicle egress from the site to a paved public road. (A) Install a pad consisting of washed gravel (minimum-size: one inch) maintained in a clean condition to a depth of at least six inches and extending at least 30 feet wide and at least 50 feet long.

403 - 6Rule 403 (cont.) (Amended June 3, 2005)

(B) Pave the surface extending at l east 100 feet and at least 20 feet

wide. (C) Utilize a wheel shaker/wheel spreading device consisting of raised dividers (rails, pipe, or grates) at least 24 feet long and 10 feet

wide to remove bulk material from tires and vehicle undercarriages

before vehicles exit the site. (D) Install and utilize a wheel washi ng system to remove bulk material

from tires and vehicle undercarriages before vehicles exit the site. (E) Any other control measures approved by the Executive Officer and the U.S. EPA as equivalent to the actions specified in subparagraphs (d)(5)(A) through (d)(5)(D). (6) Beginning January 1, 2006, any pers on who operates or authorizes the operation of a confined animal facility subject to this Rule shall implement the applicable conservation management practices specified in Table 4 of

this Rule.

(e) Additional Requirements for Large Operations (1) Any person who conducts or aut horizes the conducting of a large operation subject to this Rule shall implement the applicable actions specified in Table 2 of this Rule at all times and shall implement the applicable actions specified in Table 3 of this Rule when the applicable performance standards can not be me t through use of Table 2 actions; and

shall: (A) submit a fully executed Large Operation Notification (Form 403 N) to the Executive Officer within 7 days of qualif ying as a large operation; (B) include, as part of the notifica tion, the name(s), address(es), and phone number(s) of the person(s) responsible for the submittal, and a description of the operation(s) , including a map depicting the location of the site; (C) maintain daily records to document the specific dust control actions taken, maintain such reco rds for a period of not less than three years; and make such records available to the Executive Officer upon request;

403 - 7Rule 403 (cont.) (Amended June 3, 2005)

(D) install and maintain project si gnage with project contact signage that meets the minimum standards of the Rule 403 Implementation Handbook, prior to initiating a ny earthmoving activities; (E) identify a dust control supervisor that: (i) is employed by or contracted with the property owner or developer; (ii) is on the site or availabl e on-site within 30 minutes during working hours; (iii) has the authority to expe ditiously employ sufficient dust mitigation measures to ensure compliance with all Rule requirements; (iv) has completed the AQMD Fugitive Dust Control Class and has been issued a valid Certificate of Completion for the class; and (F) notify the Executive Officer in writing within 30 days after the site no longer qualifies as a large operation as defined by paragraph (c)(18). (2) Any Large Operation Notification su bmitted to the Executive Officer or AQMD-approved dust control plan shall be valid for a period of one year from the date of written acceptance by the Executive Officer. Any Large Operation Notification accepted pursuant to paragraph (e)(1), excluding those submitted by aggregate-related plants and cement manufacturing facilities must be resubmitted annually by the person who conducts or authorizes the conducting of a large ope ration, at least 30 days prior to the expiration date, or the submittal shall no longer be valid as of the expiration date. If all fugitive dust sources and corresponding control measures or special circumstances rema in identical to those identified in the previously accepted submittal or in an AQMD-approved dust control plan, the resubmittal may be a simple statement of no-change (Form 403NC).

(f) Compliance Schedule The newly amended provisions of this Ru le shall become effective upon adoption. Pursuant to subdivision (e), any existing si te that qualifies as a large operation will have 60 days from the date of Rule adoption to comply with the notification and recordkeeping requirements for la rge operations. Any Large Operation

403 - 8Rule 403 (cont.) (Amended June 3, 2005)

Notification or AQMD-approved dust control plan which has been accepted prior to the date of adoption of these amendments shall remain in effect and the Large Operation Notification or AQMD-approved dust control plan annual resubmittal date shall be one year from adop tion of this Rule amendment.

(g) Exemptions (1) The provisions of this Rule shall not apply to: (A) Dairy farms. (B) Confined animal facilities provi ded that the combined disturbed surface area within one continuous pr operty line is one acre or less. (C) Agricultural vegetative crop opera tions provided that the combined disturbed surface area within one continuous property line and not separated by a paved public ro ad is 10 acres or less. (D) Agricultural vegetative crop ope rations within the South Coast Air Basin, whose combined disturbed surface area includes more than 10 acres provided that the person responsible for such operations: (i) voluntarily implements th e conservation management practices contained in the Ru le 403 Agricultural Handbook; (ii) completes and maintains the self-monitoring form documenting sufficient conservation management practices, as described in the Rule 403 Agricultural Handbook; and (iii) makes the completed self-monitoring form available to the Executive Officer upon request. (E) Agricultural vegetative crop ope rations outside the South Coast Air

Basin whose combined disturbed surface area includes more than 10 acres provided that the person responsible for such operations: (i) voluntarily implements th e conservation management practices contained in th e Rule 403 Coachella Valley Agricultural Handbook; and (ii) completes and maintains the self-monitoring form documenting sufficient conservation management practices, as described in th e Rule 403 Coachella Valley Agricultural Handbook; and (iii) makes the completed self-monitoring form available to the Executive Officer upon request.

403 - 9Rule 403 (cont.) (Amended June 3, 2005)

(F) Active operations conducted dur ing emergency life-threatening situations, or in conjunction with any officially declared disaster or state of emergency. (G) Active operations conducted by essential service utilities to provide electricity, natural gas, telephone, water and sewer during periods of service outages and emergency disruptions. (H) Any contractor subsequent to th e time the contract ends, provided that such contractor implemented the required c ontrol measures during the contractual period. (I) Any grading contractor, fo r a phase of active operations, subsequent to the contractual co mpletion of that phase of earthmoving activities, provided that th e required control measures have been implemented during the entire phase of earth-moving activities, through and including five days after the final grading inspection. (J) Weed abatement operations ordered by a county agricultural commissioner or any state, county, or municipal fire department, provided that: (i) mowing, cutting or other similar process is used which

maintains weed stubble at least three inches above the soil;

and (ii) any discing or similar operation which cuts into and disturbs the soil, where wateri ng is used prior to initiation of these activities, and a de termination is made by the agency issuing the weed abatem ent order that, due to fire hazard conditions, rocks, or other physical obstructions, it is not practical to meet the conditions specified in clause (g)(1)(H)(i). The provisions this clause shall not exempt the owner of any property from stabilizing, in accordance with paragraph (d)(2), distur bed surface areas which have

been created as a result of the weed abatement actions. (K) sandblasting operations. (2) The provisions of paragraphs (d )(1) and (d)(3) shall not apply: (A) When wind gusts exceed 25 miles per hour, provided that:

403 - 10Rule 403 (cont.) (Amended June 3, 2005)

(i) The required Table 3 contingency measures in this Rule are implemented for each applicable fugitive dust source type, and; (ii) records are maintained in accordance with subparagraph (e)(1)(C). (B) To unpaved roads, provided such roads: (i) are used solely for the maintenance of wind-generating equipment; or (ii) are unpaved public alleys as defined in Rule 1186; or (iii) are service roads that meet all of the following criteria: (a) are less than 50 feet in width at all points along the road; (b) are within 25 feet of the property line; and (c) have a traffic volume less than 20 vehicle-trips per day. (C) To any active operation, open storage pile, or disturbed surface area for which necessary fugitive dust preventive or mitigative actions are in conflict with the federal Endangered Species Act, as determined in writing by the State or federal agency responsible for making such determinations. (3) The provisions of (d)(2) shall not a pply to any aggregat e-related plant or cement manufacturing facility that im plements the applicable actions specified in Table 2 of this Rule at all times and shall implement the applicable actions specified in Table 3 of this Rule when the applicable performance standards of paragraphs (d)(1) and (d)(3) can not be met through use of Table 2 actions. (4) The provisions of paragraphs (d)(1) , (d)(2), and (d)(3) shall not apply to: (A) Blasting operations which have been permitted by the California Division of Industrial Safety; and (B) Motion picture, television, a nd video production activities when dust emissions are required for visual effects. In order to obtain this exemption, the Executive Offi cer must receive notification in writing at least 72 hours in adva nce of any such activity and no nuisance results from such activity. (5) The provisions of paragraph (d)(3) shall not apply if the dust control actions, as specified in Table 2, ar e implemented on a routine basis for

403 - 11Rule 403 (cont.) (Amended June 3, 2005)

403 - 12 each applicable fugitive dust source t ype. To qualify for this exemption, a person must maintain records in ac cordance with subpa ragraph (e)(1)(C). (6) The provisions of paragraph (d)(4) sh all not apply to earth coverings of public paved roadways where such coverings are approved by a local government agency for the protection of the roadway, and where such coverings are used as roadway crossi ngs for haul vehicles provided that such roadway is closed to through traffic and visible roadway dust is removed within one day followi ng the cessation of activities. (7) The provisions of subdivi sion (e) shall not apply to: (A) officially-designated public park s and recreational areas, including national parks, national monuments, national forests, state parks, state recreational areas, a nd county regional parks. (B) any large operation which is required to s ubmit a dust control plan to any city or county governme nt which has adopted a Districtapproved dust control ordinance. (C) any large operation subject to Rule 1158, which has an approved dust control plan pursuant to Rule 1158, provided that all sources of fugitive dust are included in the Rule 1158 plan. (8) The provisions of subparagraph (e)(1 )(A) through (e)(1)(C ) shall not apply to any large operation with an AQMD- approved fugitive dust control plan provided that there is no change to the sources and controls as identified in the AQMD-approved fugitive dust control plan.

(h) Fees Any person conducting active operations for which the Executive Officer conducts upwind/downwind monitoring for PM 10 pursuant to paragraph (d)(3) shall be assessed applicable Am bient Air Analysis Fees pursuant to Rule 304.1. Applicable fees shall be waived for any facility which is exempted from paragraph (d)(3) or meets the requirements of paragraph (d)(3).Rule 403 (cont.)(Amended June 3, 2005)TABLE 1BEST AVAILABLE CONTROL MEASURES(Applicable to All Construction Activity Sources)Source CategoryControl Measure GuidanceBackfilling01-101-201-3Stabilize backfill material when not activelyhandling; andStabilize backfill material during handling; andStabilize soil at completion of activity.9Mix backfill soil with water prior to moving9Dedicate water truck orhigh capacity hose tobackfilling equipment9Empty loader bucket slowly so that no dustplumes are generated9Minimize drop height from loader bucketClearing andgrubbing02-102-202-3Maintain stability of soil through pre-watering ofsite prior to clearing and grubbing; andStabilize soil duringclearing and grubbingactivities; andStabilize soil immediately after clearing andgrubbing activities.9Maintain live perennial vegetation wherepossible9Apply water in sufficient quantity to preventgeneration of dust plumesClearing forms03-103-203-3Use water spray to clear forms; orUse sweeping and water spray to clear forms; orUse vacuum system to clear forms.9Use of high pressure air to clear forms may causeexceedance of Rule requirementsCrushing04-104-2Stabilize surface soils prior to operation ofsupport equipment; andStabilize material after crushing.9Follow permit conditions for crushing equipment9Pre-water material prior to loading into crusher9Monitor crusher emissions opacity9Apply water to crushed material to prevent dustplumes403 - 13Rule 403 (cont.)(Amended June 3, 2005)TABLE 1BEST AVAILABLE CONTROL MEASURES(Applicable to All Construction Activity Sources)Source Category Control Measure GuidanceCut and fill05-105-2Pre-water soils prior to cut and fill activities; andStabilize soil during and after cut and fill activities.9For large sites, pre-water with sprinklers orwater trucks and allow time for penetration9Use water trucks/pulls to water soils to depthof cut prior to subsequent cutsDemolition –mechanical/manual06-106-206-306-4Stabilize wind erodible surfaces to reduce dust; andStabilize surface soil where support equipment andvehicles will operate; andStabilize loose soil and demolition debris; andComply with AQMD Rule 1403.9Apply water in sufficient quantities toprevent the generation ofvisible dust plumesDisturbed soil07-107-2Stabilize disturbed soilthroughout the constructionsite; andStabilize disturbed soil between structures9Limit vehicular traffic and disturbances onsoils where possible9If interior block walls are planned, install asearly as possible9Apply water or a stabilizing agent insufficient quantities to prevent thegeneration of visible dust plumesEarth-movingactivities08-108-208-3Pre-apply water to depth of proposed cuts; andRe-apply water as necessary to maintain soils in adamp condition and to ensure that visible emissionsdo not exceed 100 feet in any direction; andStabilize soils once earth-moving activities arecomplete.9Grade each project phase separately, timedto coincide with construction phase9Upwind fencing can prevent materialmovement on site9Apply water or a stabilizing agent insufficient quantities to prevent thegeneration of visible dust plumes403 - 14Rule 403 (cont.)(Amended June 3, 2005)TABLE 1BEST AVAILABLE CONTROL MEASURES(Applicable to All Construction Activity Sources)Source Category Control Measure GuidanceImporting/exportingof bulk materials09-109-209-309-409-5Stabilize material while loading to reduce fugitivedust emissions; andMaintain at least six inches of freeboard on haulvehicles; andStabilize material while transporting to reducefugitive dust emissions; andStabilize material while unloading to reduce fugitivedust emissions; andComply with Vehicle Code Section 23114.9Use tarps or other suitable enclosures onhaul trucks9Check belly-dump truck seals regularly andremove any trapped rocks to prevent spillage9Comply with track-outprevention/mitigation requirements9Provide water while loading and unloadingto reduce visible dust plumesLandscaping10-1Stabilize soils, materials, slopes9Apply water to materials to stabilize9Maintain materials in a crusted condition9Maintain effective cover over materials9Stabilize sloping surfaces using soil bindersuntil vegetation or ground cover caneffectively stabilize the slopes9Hydroseed prior to rain seasonRoad shouldermaintenance11-111-2Apply water to unpaved shoulders prior to clearing;andApply chemical dust suppressants and/or washedgravel to maintain a stabilized surface aftercompleting road shoulder maintenance.9Installation of curbing and/or paving of roadshoulders can reduce recurring maintenancecosts9Use of chemical dust suppressants caninhibit vegetation growth and reduce futureroad shoulder maintenance costs403 - 15Rule 403 (cont.)(Amended June 3, 2005)TABLE 1BEST AVAILABLE CONTROL MEASURES(Applicable to All Construction Activity Sources)Source Category Control Measure GuidanceScreening12-112-212-3Pre-water material prior to screening; andLimit fugitive dust emissions to opacity and plumelength standards; andStabilize material immediately after screening.9Dedicate water truck orhigh capacity hoseto screening operation9Drop material through the screen slowly andminimize drop height9Install wind barrier with a porosity of nomore than 50% upwind of screen to theheight of the drop pointStaging areas13-113-2Stabilize staging areas during use; andStabilize staging area soils at project completion.9Limit size of staging area9Limit vehicle speeds to 15 miles per hour9Limit number and size of staging areaentrances/existsStockpiles/Bulk MaterialHandling14-114-2Stabilize stockpiled materials.Stockpiles within 100 yards of off-site occupiedbuildings must not be greater than eight feet inheight; or must have a roadbladed to the top to allowwater truck access or must have an operational waterirrigation system that is capable of complete stockpilecoverage.9Add or remove material from the downwindportion of the storage pile9Maintain storage piles to avoid steep sidesor faces403 - 16Rule 403 (cont.)(Amended June 3, 2005)TABLE 1BEST AVAILABLE CONTROL MEASURES(Applicable to All Construction Activity Sources)Source Category Control Measure GuidanceTraffic areas forconstructionactivities15-115-215-3Stabilize all off-road traffic and parking areas; andStabilize all haul routes; andDirect construction traffic over established haulroutes.9Apply gravel/paving to all haul routes assoon as possible to all future roadway areas9Barriers can be used to ensure vehicles areonly used on established parking areas/haulroutesTrenching16-116-2Stabilize surface soils where trencher or excavatorand support equipment will operate; andStabilize soils at the completion of trenchingactivities.9Pre-watering of soils prior to trenching is aneffective preventive measure. For deeptrenching activities, pre-trench to 18 inchessoak soils via the pre-trench and resumingtrenching9Washing mud and soils from equipment atthe conclusion of trenching activities canprevent crusting and drying of soil onequipmentTruck loading17-117-2Pre-water material prior to loading; andEnsure that freeboard exceeds six inches (CVC23114)9Empty loader bucket such that no visibledust plumes are created9Ensure that the loader bucket is close to thetruck to minimize drop height while loadingTurf Overseeding18-118-2Apply sufficient water immediately prior toconducting turf vacuuming activities to meet opacityand plume length standards; andCover haul vehicles prior to exiting the site.9Haul waste material immediately off-site403 - 17(Amended June 3, 2005)TABLE 1BEST AVAILABLE CONTROL MEASURES(Applicable to All Construction Activity Sources)403 - 18Source Category Control Measure GuidanceUnpavedroads/parking lots19-119-2Stabilize soils to meet the applicable performancestandards; andLimit vehicular travel toestablished unpaved roads(haul routes) and unpaved parking lots.9Restricting vehicular access to establishedunpaved travel paths and parking lots canreduce stabilization requirementsVacant land20-1In instances where vacant lots are 0.10 acre or largerand have a cumulative area of 500 square feet ormore that are driven over and/or used by motorvehicles and/or off-road vehicles, prevent motorvehicle and/or off-roadvehicle trespassing, parkingand/or access by installing barriers, curbs, fences,gates, posts, signs, shrubs, trees or other effectivecontrol measures.Rule 403 (cont.)Rule 403 (cont.) (Amended June 3, 2005)



### Table 2 DUST CONTROL MEASURES FOR LARGE OPERATIONS

FUGITIVE DUST SOURCE CATEGORY CONTROL ACTIONS

Earth-moving (except construction cutting and filling areas, and mining operations) (1a) Maintain soil moisture content at a minimum of12 percent, as determined by ASTM method D2216, or other equivale nt method approved by the Executive Officer, the California Air Resources Board, and the U.S. EPA. Two soil moisture evaluations must be conducted during the first three hours of active operations during a calendar day, and two su ch evaluations each subsequent four-hour period of active operations; OR (1a-1) For any earth-moving which is more than 100 feet from all property lin es, conduct watering as necessary to prevent visible dust emissions from exceeding 100 feet in length in any direction. Earth-moving: Construction fill areas: (1b) Maintain soil moisture content at a minimum of12 percent, as determined by ASTM method D2216, or other equivale nt method approved by the Executive Officer, the California Air Resources Board, and the U.S. EPA. For areas which have an optimum moisture content for compaction of less than 12 percent, as determined by ASTM Method 1557 or other equivalent method approved by the Executive Officer and the California Air Resources Board and the U.S. EPA, complete the compaction process as expeditiously as possible after achieving at least 70 percent of the optimum soil moisture content. Two soil moisture evaluations must be conducted during the first three hours of active operations during a calendar day, and twosuch evaluations during each subsequent fourhour period of active operations.

403 - 19Rule 403 (cont.) (Amended June 3, 2005)

Table 2 (Continued) FUGITIVE DUST SOURCE CATEGORY CONTROL ACTIONS

Earth-moving: Construction cut areas and mining operations: (1c) Conduct watering as necessary to prevent visible emissions from extending more than 100 feet beyond the active cut or mi ning area unless the area is inaccessible to watering vehicles due to slope conditions or other safety factors. Disturbed surface areas (except completed grading areas) (2a/b) Apply dust suppression in sufficient quantity and frequency to maintain a stabilized surface. Any areas which cannot be stabilized, as evidenced by wind driven fugitive dust must have an application of water at least twice per day to at least 80 percent of the unstabilized area. Disturbed surface areas: Completed grading areas (2c) Apply chemical stabilizers within five working days of grading completion; OR

(2d) Take actions (3a) or (3c) specified for inactive disturbed surface areas. Inactive disturbed surface areas (3a) Apply water to at least 80 percent of all inactive disturbed surface areas on a daily basis when there is evidence of wind driven fugitive dust, excluding any areas which are inaccessible to watering vehicles due to excessive slope or ot her safety conditions; OR (3b) Apply dust suppressant s in sufficient quantity and frequency to maintain a stabilized surface; OR (3c) Establish a vegetative ground cover within 21 days after active operations have ceased. Ground cover must be of sufficient density to expose less than 30 percent of unstabilized ground within 90 days of planting, and at all times thereafter; OR (3d) Utilize any combination of control actions (3a), (3b), and (3c) such that, in total, these actions apply to all inactive disturbed surface areas.

403-20Rule 403 (cont.) (Amended June 3, 2005)

Table 2 (Continued) FUGITIVE DUST SOURCE CATEGORY CONTROL ACTIONS

Unpaved Roads (4a) Water all roads used for any vehicular traffic at least once per every two hours of active operations [3 times per normal 8 hour work day]; OR (4b) Water all roads used for any vehicular traffic once daily and restrict vehicle speeds to 15 miles per hour; OR (4c) Apply a chemical stabilizer to all unpaved road surfaces in sufficient quantity and frequency to maintain a stabilized surface. Open storage piles (5a) Apply chemical stabilizers; OR (5b) Apply water to at leas t 80 percent of the surface area of all open storage piles on a daily basis when there is evidence of wind driven fugitive dust; OR (5c) Install temporary coverings; OR (5d) Install a three-sided enclosure with walls with no more than 50 percent porosity which extend, at a minimum, to the top of the pile. This option may only be used at aggregat e-related plants or at cement manufacturing facilities. All Categories (6a) Any other control measures approved by the Executive Officer and the U.S. EPA as equivalent to the methods specified in Table 2 may be used.

403-21Rule 403 (cont.) (Amended June 3, 2005)

TABLE 3 CONTINGENCY CONTROL MEASUR ES FOR LARGE OPERATIONS

FUGITIVE DUST SOURCE CATEGORY CONTROL MEASURES

Earth-moving (1A) Cease all active operations; OR (2A) Apply water to soil not more than 15 minutes prior to moving such soil. Disturbed surface

areas (0B) On the last day of active operations prior to a weekend, holiday, or any other period when active operations will not occur for not more than four consecutive days: apply water with a mixture of chemical stabilizer diluted to not less than 1/20 of the concentration required to maintain a stabilized surface for a period of six months; OR (1B) Apply chemical stabilizers prior to wind event; OR (2B) Apply water to all unstabilized disturbed areas 3 times per day. If there is any evidence of wind driven fugitive dust, watering frequency is increased to a minimum of four times per day; OR (3B) Take the actions specified in Table 2, Item (3c); OR (4B) Utilize any combination of control actions (1B), (2B), and (3B) such that, in total, these actions apply to all disturbed surface areas. Unpaved roads (1C) Apply chemical stabilizers prior to wind event; OR (2C) Apply water twice per h our during active operation; OR (3C) Stop all vehicular traffic. Open storage piles (1D) Apply water twice per hour; OR (2D) Install temporary coverings. Paved road track-out (1E) Cover all haul vehicles; OR (2E) Comply with the vehicle freeboard requirements of Section 23114 of the Calif ornia Vehicle Code for both public and private roads. All Categories (1F) Any other control measures approved by the Executive Officer and the U.S. EPA as equivalent to the methods specified in Table 3 may be used.

403-22Rule 403 (cont.) (Amended June 3, 2005)



### Table 4 (Conservation Management Practices for Confined Animal Facilities)

SOURCE CATEGORY CONSERVATION MANAGEMENT PRACTICES

Manure Handling (1a) (1b) Cover manure prior to rem oving material off-site; AND Spread the manure before 11:00 AM and when wind conditions are less than 25 miles per hour; AND (Only applicable to Commercial Poultry Ranches) (1c)

(1d) Utilize coning and drying manur e management by removing manure at laying hen houses at l east twice per year and maintain a base of no less than 6 inches of dry manure afte r clean out; or in lieu of complying with c onservation management practice (1c), comply with conservation management practice (1d). Utilize frequent manure removal by removing the manure from laying hen houses at least ever y seven days and immediately thin bed dry the material. Feedstock Handling (2a) Utilize a sock or boot on the f eed truck auger when filling feed storage bins. Disturbed Surfaces (3a)

(3b)

(3c) Maintain at least 70 percent ve getative cover on vacant portions of the facility; OR Utilize conservation tillage prac tices to manage the amount, orientation and distribution of crop and other plant residues on the soil surface year-round, while growing crops (if applicable) in narrow slots or tilled strips; OR Apply dust suppressants in suff icient concentrations and frequencies to maintain a stabilized surface. Unpaved Roads (4a)

(4b)

(4c) Restrict access to pr ivate unpaved roads either through signage or physical access restrictions a nd control vehicular speeds to no more than 15 miles per hour through worker notifications, signage, or any other necessary means; OR Cover frequently traveled unpave d roads with low silt content material (i.e., asphalt, concrete, re cycled road base, or gravel to a minimum depth of four inches); OR Treat unpaved roads with wa ter, mulch, chemical dust suppressants or other cover to maintain a stabilized surface. Equipment Parking Areas (5a)

(5b) Apply dust suppressants in suffici ent quantity and frequency to maintain a stabilized surface; OR Apply material with low silt content (i.e., asphalt, concrete, recycled road base, or gravel to a depth of four inches).

403-23