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RULE 8081 AGRICULTURAL SOURCES (Adopted November 15, 2001; Amended 

September 16, 2004)

1.0 Purpose 

The purpose of this rule is to limit fugitive dust emissions from agricultural sources. 

2.0 Applicability 

This rule applies to off-field agricultural sources. The provisions of this rule adopted 

on November 15, 2001 shall remain in effect until October 1, 2004 at which time the 

amendments adopted on August 19, 2004 shall take effect. 

3.0 Definitions 

The definitions of terms established in Rule 8011 (General Requirements) shall apply to 

this rule. 

4.0 Exemptions 

In addition to the exemptions established in Rule 8011, the following exemptions are 

established for this rule: 

4.1 On-field agricultural sources. 

4.2 Off-field agricultural sources necessary to minimize or respond to adverse 

effects on agricultural crops caused during freezing temperatures as declared by 

the National Weather Service. 

4.3 Any outdoor storage, handling, or transport of bulk materials which would be 

damaged by wetting with water or by the application of chemical/organic dust 

suppressants, provided owners/operators demonstrates to the satisfaction of the 

APCO and USEPA, that none of the control measures specified in Table 8081-1 

of this rule can be implemented to limit visible dust emissions (VDE) to 20% 

opacity or provide a stabilized surface as defined in Rule 8011. 

4.4 Any unpaved road segment with less than 75 vehicle trips for that day. If 75 

vehicle trips for that day will be exceeded, an owner/operator shall comply with 

the requirements of this Rule. This threshold does not apply to unpaved road 

segments subject to the requirements of Rule 4550 (Conservation Management 

Practices). Equipment with loading forks employed in the act of loading or 

unloading harvested commodities in the harvest location and traveling at 3 miles 

per hour or less are not included in the trip counts. 
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4.5 The felling and removal of trees from forest stands. However, the rules of 

Regulation VIII will apply to other timber harvest activities such as site 

preparation of log storage and staging areas. 

4.6 Outdoor storage of any bulk material at a single site where no material is actively 

being added or removed and where the total material stored is less than 100 cubic 

yards. 

4.7 Any unpaved vehicle and equipment parking and traffic area less than 1.0 acre 

and more than one mile from an urban area, or with less than 50 Average 

Annual Daily Trips (AADT) or less than 150 VDT that are utilized 

intermittently for a period of 30 days or less during the calendar year. 

4.8 Transport of a bulk material in an outdoor area for a distance of twelve feet or 

less with the use of a chute or conveyor device. 

5.0 Requirements 

An owner/operator shall comply with Sections 5.1 through 5.3 and sufficiently 

implement at least one of the control measures indicated in each section of Table 8081-

1 to limit VDE to 20% opacity or to comply with the conditions for a stabilized surface 

as defined in Rule 8011. In addition to the requirements of this rule, a person shall 

comply with all other applicable requirements of Regulation VIII. 

5.1 Requirements for Bulk Materials 

No person shall undertake any outdoor handling, storage, and transport of bulk 

materials unless the appropriate requirements in Table 8081-1 of this rule are 

sufficiently implemented to limit VDE to 20% opacity or to comply with the 

conditions for a stabilized surface as defined in Rule 8011. 

 5.2 Requirements for Paved Roads and Unpaved Road Segments 

5.2.1 Paved Road Segment 

An owner/operator shall comply with the requirements of Rule 8061 

(Paved and Unpaved Roads) regarding the construction standards for 

shoulder width and medians when constructing new paved roads or 

modifying existing paved roads. 
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TABLE 8081-1 

CONTROL MEASURES FOR BULK MATERIALS 

A. HANDLING OF BULK MATERIALS: 

A1 When handling bulk materials, apply water or suitable chemical/organic 

stabilizers/suppressants sufficient to limit VDE to 20% opacity or; 

A2 Construct and maintain wind barriers sufficient to limit VDE to 20% opacity and 

with less than 50% porosity. If utilizing fences or wind barriers, control measure 

A1 shall also be implemented. 

B. STORAGE OF BULK MATERIALS: 

B1 When storing bulk materials, comply with the conditions for a stabilized surface as 

defined in Rule 8011; or 

B2 Cover bulk materials stored outdoors with tarps, plastic, or other suitable material 

and anchor in such a manner that prevents the cover from being removed by wind 

action; or 

B3 Construct and maintain fences or wind barriers sufficient to limit VDE to 20% 

opacity and with less than 50% porosity. If utilizing fences or wind barriers, apply 

water or suitable chemical/organic stabilizers/suppressants sufficient to limit VDE 

to 20% opacity or; 

B4 Utilize a 3-sided structure with a height at least equal to the height of the storage 

pile and with less than 50% porosity. 

C. ON-SITE TRANSPORTING OF BULK MATERIALS: 

C1 Limit vehicular speed while traveling on the work site sufficient to limit VDE to 

20% opacity; or 

C2 Load all haul trucks such that the freeboard is not less than six (6) inches when 

material is transported across any paved public access road; or 

C3 Apply water to the top of the load sufficient to limit VDE to 20% opacity; or 

C4 Cover haul trucks with a tarp or other suitable cover. 

D. OFF-SITE TRANSPORTING OF BULK MATERIALS: 

D1 Clean the interior of the cargo compartment or cover the cargo compartment before 

the empty truck leaves the site; and 

D2 Prevent spillage or loss of bulk material from holes or other openings in the cargo 

compartment’s floor, sides, and/or tailgate; and 

D3 Load all haul trucks such that the freeboard is not less than six (6) inches when 

material is transported on any paved public access road and apply water to the top 

of the load sufficient to limit VDE to 20% opacity; or cover haul trucks with a tarp 

or other suitable closure. 

E. OUTDOOR TRANSPORT OF BULK MATERIALS WITH A CHUTE OR 

CONVEYOR: 

E1 Fully enclose the chute or conveyor; or 

E2 Operate water spray equipment that sufficiently wets materials to limit VDE to 

20% opacity; or 

E3 Wash separated or screened materials to remove conveyed materials having an 

aerodynamic diameter of 10 microns or less sufficient to limit VDE to 20% 

opacity. 
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5.2.2 Unpaved Road Segments 

5.2.2.1 On each day that 75 or more vehicle daily trips (VDT), or 25 or 

more VDT with 3 or more axles, will occur on an unpaved road 

segment, the owner/operator shall limit VDE to 20% opacity 

and comply with the requirements of a stabilized unpaved road 

by application and/or re-application/maintenance of at least one 

of the following control measures, or shall implement an 

approved Fugitive PM10 Management Plan as specified in 

section 7.0. 

5.2.2.1.1 Watering; 

5.2.2.1.2 Uniform layer of washed gravel; 

5.2.2.1.3 Chemical/organic dust suppressants; 

5.2.2.1.4 Vegetative materials; 

5.2.2.1.5 Paving; 

5.2.2.1.6 Roadmix; 

5.2.2.1.7 Any other method(s) that can be demonstrated to 

the satisfaction of the APCO that effectively limits 

VDE to 20% opacity and meets the conditions of a 

stabilized unpaved road. 

5.3 Requirements for Unpaved Vehicle/Equipment Parking and Traffic Areas 

The control measures specified in Sections 5.3.1 through 5.3.5 shall be 

implemented on unpaved surface areas dedicated to any vehicle and equipment 

parking and traffic activity in order to limit VDE to 20% opacity and comply 

with the requirements of a stabilized unpaved road as specified in Rule 8011. If 

vehicle activity remains exclusively within an unpaved vehicle/equipment traffic 

area, section 5.3 may be implemented to limit VDE to 20% opacity. 

5.3.1 Where 50 or more AADT will occur on an unpaved vehicle/equipment 

traffic area, the owner/operator shall limit VDE to 20% opacity and 

comply with the requirements of a stabilized unpaved road by the 

application and/or reapplication/maintenance of at least one of the 

following control measures, or shall implement an approved Fugitive 

PM10 Management Plan as specified in section 7.0: 

5.3.1.1 Watering 

5.3.1.2 Uniform layer of washed gravel; 

5.3.1.3 Chemical/organic dust stabilizers/suppressants in accordance 

with the manufacturer’s specifications; 

5.3.1.4 Roadmix; 
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5.3.1.5 Paving; 

5.3.1.6 Any other method(s) that can be demonstrated to the 

satisfaction of the APCO that effectively limits VDE to 20% 

opacity and meets the conditions of a stabilized unpaved road. 

5.3.2 For unpaved vehicle/equipment traffic areas with 150 or more VDT, or 

150 or more VDT that are utilized intermittently for a period of 30 days 

or less during the calendar year, the owner/operator shall implement the 

control options specified in 5.3.1.1 through 5.3.1.6.

5.3.3 On each day that 25 or more VDT with 3 or more axles will occur on an 

unpaved vehicle/equipment traffic area, the owner/operator shall limit 

VDE to 20% opacity and comply with the requirements of a stabilized 

unpaved road by the application and/or re-application/maintenance of at 

least one of the control measures specified section 5.3.1.1 through 

5.3.1.6. 

5.3.4 On each day that 75 or more VDT, or 26 or more VDT with 3 or more 

axles originates from within and remains exclusively within an unpaved 

vehicle/equipment traffic area, the owner/operator may apply/re-apply 

water to limit VDE to 20% opacity. 

5.3.5 An owner/operator shall restrict access and periodically stabilize a 

disturbed surface area whenever a site becomes inactive at the end of the 

workday to comply with the conditions for a stabilized unpaved road as 

defined in Rule 8011. 

5.4 Requirements for Carryout/Trackout 

The District hereby incorporates by reference California Vehicle Code section 

23112-23113. This section requires material, including dirt deposited on any 

public highway or street to be cleaned up as specified in California Vehicle 

Code 23112-23113. 

6.0 Administrative Requirements 

6.1 Test Methods 

The applicable test methods specified in Rule 8011 shall be used to determine 

compliance with this rule. 
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6.2 Recordkeeping 

An owner/operator shall comply with the recordkeeping requirements specified 

in Rule 8011. 

7.0 Fugitive PM10 Management Plan for Unpaved Roads and Unpaved Vehicle/Equipment 

Traffic Areas 

As a compliance alternative for sections 5.2.2, 5.3.1, and 5.3.2 of this rule, an 

operator may implement a Fugitive PM10 Management Plan (FPMP) that is designed to 

achieve 50% control efficiency and has been approved by the Fresno Regional office of 

the United States Department of Agriculture Natural Resource Conservation Service 

based on guidance and criteria established by the APCO. The FPMP shall be 

implemented on all days that traffic exceeds, or is expected to exceed, the number of 

annual average daily vehicle trips or vehicle trips per day as specified in sections 5.2.2, 

5.3.1, and 5.3.2 of this rule. The owner/operator remains subject to all requirements 

of the applicable rules of Regulation VIII that are not addressed by the FPMP. It should 

be noted that the FPMP is not a compliance option for any requirement for a stabilized 

surface as defined in Rule 8011. 

7.1 An owner/operator shall provide the proposed FPMP to the local office of the 

USDA Resource Conservation District (RCD) via fax, mail, or in person. The 

RCD shall submit the proposed FPMP to the Fresno Regional Office of the 

NRCS, who in turn shall evaluate and approve, disapprove, or conditionally 

approve each proposed FPMP based on guidance and criteria established by the 

APCO. An FPMP shall not be considered approved until the operator has 

received written approval from the NRCS. The NRCS and local RCDs shall 

make all approved FPMPs available to the APCO and the public. 

7.2 An owner/operator may submit one FPMP covering multiple unpaved roads and 

unpaved vehicle/equipment traffic areas. 

7.3 An owner/operator shall retain a copy of an approved FPMP at the operators 

place of business and make it available for inspection by the APCO or his 

designee during normal business hours. The approved FPMP shall remain valid 

until the APCO notifies the owner/operator or the NRCS that it needs to be 

revised, or until the owner/operator notifies the NRCS that the owner/operator 

has permanently discontinued implementing the FPMP. The NRCS shall notify 

the APCO as soon as possible in the event an operator notifies the NRCS the 

owner/operator has permanently discontinued implementing the FPMP. 

7.4 Failure to comply with the provisions of an approved FPMP is deemed to be a 

violation of this rule. 

7.5 A FPMP shall contain all of the following information: 
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7.5.1 Name(s), address(es), and phone number(s) of person(s) responsible for 

the preparation, submittal, and implementation of the FPMP, and of 

person(s) responsible for the unpaved road or traffic area. 

7.5.2 A plot plan or map which shows the location of each unpaved road or 

traffic area to be covered by the FPMP, and the total length (miles) of 

unpaved roads, and the total area (acres) of the unpaved traffic areas. 

7.5.3 The months (and weeks, if known) of the year that vehicle traffic is 

expected to exceed 75 vehicle trips per day, and the types of vehicles 

(e.g., passenger vehicles, trucks, mobile equipment) expected on each 

road or traffic area. As stated above, the FPMP shall be implemented 

on all days that traffic exceeds, or is expected to exceed, the number of 

annual average daily vehicle trips or vehicle trips per day as specified in 

sections 5.2.2, 5.3.1, and 5.3.2 of this rule. 

7.5.4 Dust suppressants, gravel, and/or vegetative materials to be applied, 

including: product specifications; manufacturer’s usage instructions 

(method, frequency, and intensity of application); type, number, and 

capacity of application equipment; and information on environmental 

impacts and approvals or certifications related to appropriate and safe use 

for ground application. 

7.5.5 A description of the condition of the treated surfaces to be achieved as a 

result of the use of the suppressant or other dust control material. 
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