CALIFORNIA AIR RESOURCES BOARD

SIP COMPLETENESS CHECKLIST

(Electronic Format)

*** TO BE COMPLETED BY DISTRICT AND RETURNED TO ARB ***

All rules submitted to the EPA as State Implementation Plan (SIP) revisions must be supported by certain information an d documentation for the rule packages to be deemed complete for review by the EPA. Rules will not be evaluated for approvability by the EPA unless the submittal packages are complete. To assist you in determining that all necessary materials are included in rules packages sent to the ARB for submittal to the EPA, please fill out the following form and include it with the rule package you send ARB. See the ARB's Guidelines on the Implementation of the 40 CFR 51, Appendix V , for a more detailed explanation than is provided here. Adopted rules and rule amendments should be checked against U.S. EPA's Guidance Document for Correcting Common VOC & Other Rule Deficiencies (Little Blue Book, August 21, 2001) to ensure that they contain no elements which will res ult in disapproval by EPA.

District: Imperial County APCD

Rule No: 800

Rule Title: General Requirments For Control of Fine Particulate Matter (PM10)

Date Adopted or Amended: November 8, 2005

A DMINISTRATIVE MATERIALS

Note: All documents should be in electronic format. Items that have signatures, initials, or stamps may be scanned.

Not Attached Attached N/A

COMPLETE COPY OF THE RULE: Provide an unmarked copy of the entire rule as adopted or amended by your District Board.

UNDERLINE AND STRIKEOUT COPY OF THE RULE : If an amended rule, provide a complete copy of the rule indicatin g in underline and strikeout format all language which has been added, deleted, or changed since the rule was last adopted or amended.

COMPLETE COPY OF THE REFERENCED RULE(S): For any rule which inc ludes language specifically referencing another rule, a copy of that other rule must also be submitted, unless it has already been submitted to EPA as part of a previous SIP submittal.

PUBLIC NOTICE EVIDENCE: Include a copy of the local newspaper clipping certification(s), stating the date of publication, which must be at least 30 days before the hearing. As an alternative, include a copy of the actual published notice of the public hearing as it ap peared in the local newspaper(s). In this case, however, enough of the newspaper page must be included to show the date of publication. The notice must specifically identify by title and number each rule adopted or amended.

RESOLUTION/MINUTE ORDER: Provide the Board Clerk certified resolution or minute order. This document must include certification that the hearing was held in accordance with the information in the public notice. It must also lis t the rules that were adopted or amended, the date of the public hearing, and a statement of compliance with California Health and Safety Code Sections
40725

- 40728 (Administrative Procedures Act).

PU BLIC COMMENTS AND RESPONSES: Submit copies of written public comments made during the notice period and at the public hearing. Also submit any written responses prepared by the District staff or presented to the District Board at the public hearing. A s ummary of the public comments and responses is adequate. If there were no comments made during the notice period or at the hearing, please indicate N/A to the left.5/1/2002 CALIFORNIA AIR RESOURCES BOARD

SIP COMPLETENESS CHECKLIST

(Electronic Format)

TECHNICA L MATERIALS

Note: All documents and forms should be in electronic format.

Not Attached Attached N/A

RULE EVALUATION FORM: See instructions for completing the Rule Evaluation Form and the accomp anying sample form.

NON

- EPA TEST METHODS: Attach all test methods that are referenced in your rule that do not appear in 40 CFR 51, 60, 61, 63, or have not been previously
submitted to EPA. EPA met hods used in other media such as SW846 for solid waste are not automatically approved for air pollution applications. Submittal of
test methods that are not EPA

- approved should include the information and follow the procedure described in Region 9’s “Test Method Review & Evaluation Process.”

MODELING SUPPORT: Provide if appropriate. In general, modeling support is not required for VOC and NOx rules to determine their impacts on ozone levels.
Model ing is required where a rule is a relaxation that affects large sources ( > 100 TPY) in an attainment area for SO2, directly emitted PM10, CO, or NOx (for NO2 purposes). In cases where EPA is concerned with the impact on air quality of rule revisions which relax limits or cause a shift in emission patterns in a nonattainment area, a reference back to the approved SIP will be sufficient provided the approved SIP accounts for the relaxation and provided the approved SIP used the current EPA modeling guideline s. If current EPA modeling guidelines were not used, then new modeling may be required.

ECONOMIC AND TECHNICAL JUSTIFICATION FOR DEVIATIONS FROM EPA POLICIES : The District staff report or other inf ormation included with the submittal should discuss all potential relaxations or deviations from RACT, RACM, BACT, BACM, enforceability, attainment, RFP, or other relevant EPA requirements. This includes, for example, demonstrating that exemptions or
emis sion limits less stringent than the presumptive RACT (e.g., a CTG) meet EPA’s 5 percent policy, and demonstrating that all source categories exempted from a RACM/BACM rule are de minimus according to EPA’s RACM/BACM policy.

ADDITIONAL MATERIALS : Provide District staff reports and any other supporting information concerning development of the rule or rule changes. This information should explain the basis for all limits and thresholds contained in

t he rule.CALIFORNIA AIR RESOURCES BOARD

APCD/AQMD RULE EVALUATION FORM

– Page 1

(Electronic Format)

I. GENERAL INFORMATION

District: Imperial County Air Pollution Control District

Rule No(s): Rule 800 Date adopted/Amended/Rescinde d: Amended November 8, 2005

Rule Title(s): General Requirements For Control of Fine Particulate Matter (PM

- 10)

Date Submitted to ARB: March 30, 2006

If an Amended Rule, Date Last Amended (or Adopted): November 25, 1996

Is the Rule Intended to be Sent to the U.S. EPA as a SIP Revision? Yes No ( If No, do not complete remainder of form)

District Contact: Reyes Romero Phone Number: (760) 482

- 4606 E

- mail Address: reyesromero@imperialcounty.net

Narrative Summary of New Rule or Rule Changes: New Rule Amended Rule

Rule 800 is the first of a series of seven rules which together form Regulation VIII, Fugitive Dust Control. On August 11, 2004 the Imperial County was redesignated as a "serious"non attainment area for PM10. This rule, as an integral part of regulation VIII, was amended to help fullfill the requireme nt of Best Available Control Measures (BACM.) Rule 800 applies at any active operation and/or man

- made condition or practice with the potential to generate fugitive dust (PM10.) This rule is the general requirements section of R egulation VIII . It include s
definitions , record implementation, compliance and test methods.

Pollutant(s) Regulated by the Rule (Check): ROG (NOx) SO2 (CO) PM TAC (name):

II. EFFECT ON EMISSIONS

Complete this section ONLY for rules that, when implemented, will result in quantifiable changes in emissions. Attach reference(s) for emission

factor(s) and other information. Attach calculation sheet showing how the emi ssion information provided below was determined

.

Net Effect on Emissions: Increase Decrease N/A

Emission Reduction Commitment in SIP for this Source Category: N/A

Inven tory Year Used to Calculate Changes in Emissions: N/A Area Affected: N/A

Future Year Control Profile Estimate (Provide information on as many years as possible) : N/ACALIFORNIA AIR RESOURCES BOARD

APCD/ AQMD RULE EVALUATION FORM

- Page 2

(Electronic Format)

Baseline Inventory in the SIP for the Control Measure: N/A

Emissions Reduction Commitment in the SIP for the Control Measure: N/A

Revised Baseline Inventory (if any): N/A

Revised Emission Reduction Estimate (if developed): N/A

Note that the district’s input to the Rule Evaluation Form will not be used as input to the ARB’s emission forecasting and planning.

III. SOURCES/ATTAINMENT STATUS

District is: Attainment Nonattainment Split

Approximate Total Number of Small (<100 TPY) Sources Affected by this Amendment: N/A

Percent in Nonattainment Area: N/A %

Num ber of Large (

> 100 TPY) Sources Controlled: N/A Percent in Nonattainment Area: N/A %

Name(s) and Location(s) (city and county) of Large ( > 100 TPY) Sources Controlled by Rule (Attach additional sheets as

necessary) : N/A

IV. EMISSION REDUCTION TECHNOLOGY

Does the Rule Include Emission Limits that are Continuous? Yes No

If Yes, Those Limits are in Section(s) of the Rule.

Other Methods in the Rule fo r Achieving Emission Reductions are:

V. OTHER REQUIREMENTS

The Rule Contains:

Emission Limits in Section(s): Work Practice Standards in Section(s): Recordkeeping Requirements in Section(s ): H Reporting Requirements in Section(s): H5/1/2002 CALIFORNIA AIR RESOURCES BOARD

APCD/AQMD RULE EVALUATION FORM

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(Electronic Format)

VI. IMPACT ON AIR QUALITY PLAN

No Impact Impact s RFP Impacts attainment

Discussion: Rule 800 is an administrative rule. This rule includes definitions, record implementation, compliance and test

methods.Imperial County Air Pollution Control District DRAFT Rule 800

October 7, 2005

1 RULE 80 0

. GENERAL FUGITIVE DUST REQUIREMENTS F

OR CONTROL OF FINE

PARTICULATE MATTER (PM

- 10) (Adopted 10/10/94; revised 11/25/96 ; r evised

------------- )

A. General Description

The purpose of this regulation is to reduce the amount of fine Particulate Ma tter (PM

- 10) entrained in the ambient air as a result of emissions generated from anthropogenic (man

- made) Fugitive Dust (PM

- 10) sources generated from within Imperial County by requiring actions to prevent, reduce, or mitigate PM

- 10 emissions. This Regul ation contains EPA required Reasonably Available Control Measures (RACM) to be included in the Imperial County Air Pollution Control District (APCD) Non

- Attainment Area Plan for attaining the National Ambient Air Quality Standards for PM

- 10. The Rules

cont ained with

in this Regulation have been developed pursuant to United States Environmental Protection Agency guidance for Serious PM10 Non Attainment Areas.

B. Applicability

The requirements of this r ule R egulation shall apply to any Active Operation, an d/or

man

- made or man

- caused condition or practice capable of generating Fugitive Dust (PM

10) as specified in this Regulation except those determined exempt as defined in Part E of

this Rule Regulation

. The definitions, exemptions, requirements, administra tive requirements recordkeeping requirements, and test methods set forth in this rule are applicable to all the rules under Regulation VIII (F ugitive Dust Requirements) of the Rules and Regulations of the Imperial County Air Pollution Control District.

C

. Definitions

For the purpose of this Regulation, the following terms are defined:

C.1 ACTIVE OPERATION: Activities capable of generating Fugitive Dust (PM

- 10) conducted for industrial, commercial, state, federal, city, county or special district

purpo ses and their contractors, including but not limited to, E arthmoving

A ctivities, C onstruction activities, U npaved R oads, T rack

- O ut/ C arry

- O ut, B ulk

M aterial storage and transport, U npaved H aul/ A ccess R oads

.

C.2 AGGREGATE MATERIALS: C onsists o

f sand, G rave l, quarried stone and/or rock fragme nts that are typically used in C onstruction. Aggregates may be natural, artificial or recycled.

C.3 ANEMOMETRS: Are devices used to measure wind speed and direction in

accordance with manufacturer’s performance stand ards, maintenance and

calibration criteria.Imperial County Air Pollution Control District DRAFT Rule 800

October 7, 2005

2 C.4 ANNUAL AVERAGE DAILY VEHICLE TRIPS: annual average 24

- hour total

of all vehicles counted on a road.

C. 2 5 APCD: The Imperial County Air Pollution Control District.

C

. 3 6 APCO: The Imperial County Air Pollu tion Control Officer.

C. 7 AVERAGE VEHICLE TRIPS PER DAY: Means the average number of vehicles that cross a given

point surface during a specific 24

- hour period as determined by the most recent Institute of Transportation Engineers trip generation manual, tube counts, or observations.

C. 8 BLM: The Bureau of Land Management.

C. 9 BP: The United States Border Patrol.

C

. 4 10 BULK MATERIAL: Earth, rock, Silt, sediment, sand, Gravel, soil, fill,

A ggregate, dirt, mud, debris, and other organic and/or inorgani c material consisting of or containing Particulate Matter with five percent or greater Silt

content. For the purpose of this Regulation , the S ilt content level is assumed to be 5 percent or greater, unless the P erson responsible for the Active Operation

co nducts the applicable laboratory tests and demonstrate that the S ilt content is less than 5 percent

. Active Operations seeking to determine if the Silt content is less than five percent are required to conduct the laboratory analysis in

accordance with AS TM method C

- 136

- a (Standard Test Method for Sieve analysis of Fine and Coarse Aggregates), or other equivalent test methods approved by EPA, ARB, and the APCD

. Attachment A is ASTM method C

- 136,

attachment B is ASTM method D

- 75 for sampling aggregate mate rial.

C

. 5 1 1 CANA

L BANK: A rise of land on either side of an irrigation canal.

C

. 6 12 CHEM ICAL STABILIZATION/SUPPRESSION: A means of Fugitive Dust (PM

- 10) control implemented to mitigate PM

- 10 emissions by applying petroleum resins, asphaltic emulsions, acrylics, adhesives, or any other materials approved for use by the California Air Resources Board (CARB), U.S. Environmental Protection Agency ( U.S. EPA) and/or the APCO.

C.1 3 CONSTRUCTION : A ny on

- site mechanical activities preparatory to or related to the building, alteration, rehabilitation, or demolition of an improvement on real property, including, but not limited to, land clearing, excavation related to construction, land leveling, grading, cut and fill grading, and the erection or

demolition of a ny structure. As used in Regulation VIII, a construction site may encompass several contiguous parcels, or may encompass only a portion of oneImperial County Air Pollution Control District DRAFT Rule 800

October 7, 2005

3

parcel, depending on the relationship of the property boundaries to the actual

construction activities.

C

. 7 1 4 DESIGNATED REPR ESENTATIVE: The agent for a Person. The Designated Representative shall be responsible for and have the full authority to implement

R B ACM on behalf of the Person.

C.1 5 EARTHMOVING ACTIVITIES : The use of any equipment for an activity tha t
may generate F ugitive D ust emissions, including, but not limited to, cutting and filling, grading, leveling, excavation, tren ching, loading or unloading of B ulk

M aterials, demolishing, d rilling, adding to or removing b ulk of materials from

open storage p iles, weed abatement through disking, and back filling.

C

. 8 1 6 FUGITIVE DUST: The Particulate Matter entrained in the ambient air which is

caused from man

- made and natural activities such as, but not limited to, movement of soil, vehicles, equipment, blas ting, and wind. This excludes Particulate Matter emitted directly in the exhaust of motor vehicles or other fuel combustion devices, from portable brazing, soldering, or welding equipment, pile drivers, and stack emissions from stationary sources.

C

. 9 1 7 GRAVEL: Gravel travelways shall have a three (3) inch minimum depth

S tabilized S urface. The travelway shall have a relative compaction of not less

than 90% 95% as determined by Test Method No. California 216 of State of California, Business and Transporta tion Agency Department of Transportation, and conforming to the following grading:

3⁄4” Maximum Sieve Designation Percent Passing

1 1⁄2" 1” 100

3/4" 3⁄4” 85

- 95 90

- 100

#4 55

- 75 35

- 60

#30 25

- 45 10

- 30

#200 15

- 25* 2

- 9 *(with <5% Silt)

Reference: County of Imperial Department of Public Works Standard S

- 1101.

California Department of Transportation Standard Specification Section 26/class II Aggregate Base

C

. 10 1 8 HAUL/ACCESS ROAD: Any on

- site road used for commercial, industrial, institutional, and/or governmental traffic , excluding Haul/Access Roads used for agricultural operations

.

C

. 11 1 9 HAUL TRUCK: Any fully or partially open

- bodied licensed motor vehicle used for transporting Bu lk Material for industrial or commercial purposes.Imperial County Air Pollution Control District DRAFT Rule 800

October 7, 2005

4 C

. 12 20 IMPLEMENT OF HUSBANDRY: An unlicensed vehicle which is used exclusively in the condu ct of A gricultural O perations. An Implement of Husbandry does not include a vehicle if its existing design is pr imarily for the transportation of persons or property on a highway, unless specifically designated as such by some other provision of the Vehicle Code of California.

C. 2 1 NON

- RESIDENTIAL AREA: Any unpaved vehicle and equipment traffic area operated at an y commercial, manufacturing or government sites

.

C.2 2 MODIFIED PAVED ROAD: Any P aved R oad that is widened or improved so as to increase traffic capacity. This term does not include road maintenance, repair, chip seal, pavement or roadbed rehabilit ation that does not affect roadway geometrics, or surface overlay work.

C. 2 3 OFF

- FIELD AGRICULTURAL SOURCE: Any Agricultural Source or activity at an Agricultural Source that falls into one or more of the following categ o ries:

C. 2 3 .a Outdoor handling, storage and transport of Bulk Material;

C. 23 .b Paved Road;

C. 23 .c Unpaved Road ; or

C. 23 .d Unpaved Traffic Area.

C

. 13 2 4 OFF

- ROAD VEHICLE: Any nonstationary device, powered by an internal combustion engine or motor, used primarily off the highways to propel, move, or draw persons or property including any device propelled, moved, or drawn exclusively by human power, and used in, but not li mited to, any of the following applications: marine vessels, construction/farm equipment, utility and lawn and garden equipment, off

- road motorcycles, and off

- highway vehicles.

C.2 5 ON

- FIELD AGRICULTURAL SOURCE: Any Agricultural Source or activity at an Agricultural Source that is not an Off

- Field Agricultural Source, including (but not limited to) the following:

C.2 5 .a Activities conducted solely for the purpose of preparing land for the growing of crops or the raising of fowl or animals, such as brush or timber clearing, grubbing, scraping, ground excavation, land leveling, grading, turning under stalks, disk ing, or tilling;

C.2 5 .b Dr y ing

or pre

- cleaning of agricultural crop material on the field where it was harvested;Imperial County Air Pollution Control District DRAFT Rule 800

October 7, 2005

5

C.2 5 .c Handling or storage of agricultural crop material that is baled, cubed,

p e lletized, or long

- stemmed, on the field where it was ha rvested, and the handling of fowl or animal feed materials at sites where animals or fowl are raised;

C.2 5 .d Disturbances o f

cultivated land as a result of fallowing, planting, fertilizing or harvesting.

C.2 6 OPEN AREA: Any of the following described in Subsection C.2 6 .a through

C.2 6 .c of this rule. For the purpose of this rule, vacant portions of residential or commercial lots and contiguous parcels that are immediately adjacent to and owned and/or operated by the same individual or entity are consid ered one open area. An open area does not include an y Unpaved Traffic Area as defined in this

rule.

C.2 6 .a An un

- subdivided or undeveloped land adjoining a developed (or partially developed) residential, industrial, institutional, governmental, or

comme rcial area.

C.2 6 .b A subdivided residential, industrial, institutional, governmental, or commercial lot, which contains no approved or permitted building or structures of a temporary or permanent nature.

C.2 6 .c A partially developed residential, industri al

, institutional, governmental, or commercial lot and contiguous lots under common ownership.

C. 14 2 7 PARTICULATE MATTER: Any material, except uncombined water, which exists in a finely divided form as a liquid or solid at 60 degrees F and one atmosphere pressure.

C

. 15 2 8 PAVED ROADS: An improved street, highway, alley, public way, that is covered by concrete, asphaltic concrete, or asphalt.

C

. 16 2 9 PERSON: Any individual, public or private corporation, partnership, association,
firm, trust, estate, munici pality, or any other legal entity whatsoever which is recognized by law as the subject of rights and duties, who is responsible for an Active Operation.

C.17 PHYSICAL STABILIZATION: A means of dust control implemented to mitigate PM

- 10 emissions by appl ying vegetation, Gravel, recrushed/recycled asphalt or any other materials or methods specified for use by U.S. EPA, CARB

and/or the APCO

.Imperial County Air Pollution Control District DRAFT Rule 800

October 7, 2005

6 C

. 18 30 PM

- 10: Particulate Matter with an aerodynamic diameter smaller than or equal to

a nominal 10 microns as me asured by the applicable State and Federal reference

test methods.

C.19

. REA

SONABLY AVAILABLE CONTROL MEASURE (RACM): A technique, practice, or procedure as identified in Section I of this Regulation that is used to prevent or minimize the generation, e mission, entrainment, suspension and/or airborne transport of Fugitive Dust (PM

- 10).

C.31 RE

CREATIONAL USE: the recreational use of public lands covered by the most recent BLM dust control plan.

C

. 20 3 2 SILT: Any A

ggregate M aterial with a particle si ze less than 75 micrometers in diameter as measured by a No. 200 sieve as defined in ASTM D

- 2487 (attachment C, subsection 3.1.4 and as tested by ASTM

- C

- 136 or other equivalent test methods approved by EPA, ARB, and the APCD

. (attachment A)

.

C. 3 3 STABILI ZED SURFACE: Any disturbed surface area or open bulk storage pile

that is resistant to wind blown F ugitive D ust emissions. A surface is considered to be stabilized if it meets at least one of the following conditions specified in this

Section and as deter mined by the test methods specified in Appendix B of this

rule:

C. 3 3 .a A visible crust; or

C.33 .b A threshold friction velocity (TFV) for disturbed surface areas corrected

for non

- erodible elements of 100 centimeters per second or greater; or

C. 33 .c A flat vegetative cover of at least 50 percent that is attached or rooted vegetation; or unattached vegetative debris lying on the surface with a predominant horizontal orientation that is not subject to movement by wind; or

C.33 .d A standing vegetat ive cover of at least 30 percent that is attached or rooted vegetation with a predominant vertical orientation; or

C.33 .e A standing vegetative cover that is attached or rooted vegetative with a predominant vertical orientation that is at least 10 perce nt and where the TFV is at least 43 centimeters per second when corrected for non

- erodible elements; or

C.33 .f A surface that is greater tha n or equal to 10 percent of non

- erodible
elements such as rocks, stones, or hard

- packed clumps of soil

.Imperial County Air Pollution Control District DRAFT Rule 800

October 7, 2005

7 C. 3 4 St abilized Unpaved Road: A ny U npaved R oad or unpaved vehicle/ e quipment

traffic area

surface which meets the definition of Stabilized S urface a s determined by the test method

in Appendix B, Section C of this rule, and where VDE is limited to 20% opacity.

C.3 5 TACTICAL TRAINING: Training conducted by the U.S. Department of Defense, the U.S. military services, or its allies for combat, combat support, combat service support, tactical or relief operations. Examples include but are not limited to

munitions train ing.

C.3 6 TEMPORARY UNPAVE D ROAD: A ny U npaved R

oad surface which is created to support a temporary or periodic activity and the use of such road surface is limited to vehicle access for a period of not more than six months during any

consecutive three

- yea r period

.

C. 3 7 THRESHOLD FRICTION VELOCITY (TFV): The corrected velocity necessary to initiate soil erosion as determined by the test method specified in A ppendix B,

Section D , of t his rule. The lower TFV, the greater the propensity for fine particles t o be lifted at relatively low wind speeds.

C

. 21 3 8 TRACK

- OUT/CARRY

- OUT: Any and all Bulk Materials that adhere to and

a gglomerate on the exterior surfaces of motor vehicles and/or equipment (including tires) and excluding Implements of Husbandr y and that m ay then fall onto the pavement.

C

. 22 3 9 TRACK

- OUT PREVENTION DEVICE: A vibrating or tire spreading device to dislodge mud, dirt and/or debris from the tires and undercarriage of motor

vehicles A G

ravel pad, grizzly, wheel wash system, or a paved area, loca ted at the point of intersection of an u npaved area and a P aved R oad that prevents or

controls T rack

- O ut

.

C

. 23 40 UNPAVED ROADS: Streets, alley ways, or roadways that are improved and

maintained and that are not covered by one of the following: concrete , asphaltic concrete, asphalt, or other similar materials specified by the U.S.EPA, CARB

and/or the APCO.

C. 4 1 UNPAVED TRAFFIC AREA: Any nonresidential area that is:

C. 4 1 .a Not covered by asphalt, recycled asphalt, asphaltic concrete, concrete, or

c oncrete pavement, and

C.41 .b Used for fueling and servicing; shipping, receiving and transfer; or parking or storing equipment, haul trucks, vehicles, and any conveyances.Imperial County Air Pollution Control District DRAFT Rule 800

October 7, 2005

8 C. 4 2 VDE: Visible dust emissions. Dust emissions that are visible to an observe r.

C

. 24 4 3 VMT: Vehicle miles traveled.

C. 4 4 WIND GUST: Is the maximum instantaneous wind speed as measured by an

anemometer.

D. Compliance Schedule

D.1 Existing sources subject to this Regulation shall comply with its requirements no later than 90 day

s after its adoption date.

D.2 New sources subject to this Regulation shall comply with its requirements prior to initiation of activity.

D.3 The BLM and BP shall each comply with the following compliance schedule:

D.3.a Submit a draft dust control pla n addressing all applicable portions of this Regulation

including section F.5 within three (3) months of the adoption date of this rule, to which the APCO shall respond within 60 days;

D.3.b Submit a final dust control plan addressing all APCO comments w ithin two (2) months after receiving APCO’s comments, which the APCO shall

transmit to CARB and U.S. EPA for 45

- day review and comment;

D.3.c Implement all final dust control plan elements within six (6) months of

submittal ; and

D.3.d Submit an update d dust control plan every two calendar years by the procedures described in D.3.a to D.3.c. The updated plans shall be transmitted to the District no later than 90 days after the end of the calendar year and, in addition to information required of the ini tial plan, shall include a summary of actions taken to prevent or mitigate PM10 emissions during the previous two years.

E. Exemptions

The following activities are exempt from provisions of this Regulation:

E.1 Actions required by the Federal or State Endangered Species Act or any order issued by a court or governmental agency.

E.2 Off

- Field Agricultural Sources necessary to minimize or respond to adverse effects on agricultural crops caused during freezing temperatures as declared byImperial County Air Pollution Control District DRAFT Rule 800

October 7, 2005

9

the National Wea ther Service. Any operation already under Air Pollution Control District per mit with requirements for PM

- 10 control, provided the control of fugitive PM

- 10 emissions is at least as stringent as required by this Regulation.

E .3 Agricultural operations inc luding the growing, harvesting, tilling, cultivating and post harvesting of crops, or the raising of animals, fowl, or bees excepting the vehicle transportation, and vehicle hauling or other movement of the crops, animals, fowl or bees resulting from such operations and ingress to and egress

from Paved Roads.

E. 4 3 Non

- routine or emergency maintenance of f lood control channels and water spreading basins.

E. 5 Paved and unpaved driveways serving single family residential dwellings.

E .6 4 Any emergency ope ration and/or law enforcement activities performed to ensure public health and safety. Emergency activities lasting more than 30 days shall be subject to this R

egulation, except where compliance would limit the effectiveness of the emergency activity perf ormed to ensure public health and safety.

E.7 Outdoor storage or handling of organic or inorganic fertilizer, grains, seed and

feed ) which would be damaged by wetting

.

E .8 5 Blasting operations permitted by the California Division of Industrial Safety. Other activities performed in conjunction with blasting are not exempt from complying with the provisions of this rule

.

E. 9 6 The Recreational U se of public lands covered by the most recent BLM d ust

c ontrol p lan

that complies with Rule 800 , including but not limited to Off

- Road
Vehicles, all

- terrain vehicles, trucks, cars, motorcycles, motorbikes or motorbuggies.

E.7 Military training activities conducted by the Department of Defense including but

not limited to : (1) m

ilitary T actical T

raining , (2) maint enance, repair, and removal of targets and munitions associated with m ilitary T actical T raining , (3) open areas on active military ranges, including but not limited to designated impact areas, landing zones, and bivouac areas. Other activities performed in conjunction with

m ilitary T actical T raining are not exempt from complying with the provisions of

this rule.

F. General Requirements

F.1 Materials used for Chemical S tabilization of soils, including petroleum resins,Imperial County Air Pollution Control District DRAFT Rule 800

October 7, 2005

10

asphaltic emulsions, acrylics, and adhes ives shall not violate State Water Quality Control Board standards for use as a soil stabilizer. Materials accepted by the
California Air Resources Board (ARB) and the United States Environmental Protection Agency (EPA), and which meet State water quality standards, shall be considered acceptable to the ICAPCD.

F.2 Any material prohibited for use as dust S uppressant by EPA, the ARB, or other applicable law, rule, or regulation is also prohibited under Regulation VIII.

F.3 Use of hygroscopic materials may be prohibited by the APCD in areas lacking sufficient atmospheric moisture of soil for such materials to effectively reduce

F ugitive D ust emissions. The atmospheric moisture of soil is considered to be sufficient if it meets the application specification s of the hygroscopic product manufacturer. Use of such materials may be approved in conjunction with

sufficient wetting of the controlled area.

F.4 Any use of dust S uppressants or gravel pads, and paving materials such as asphalt or concrete for paving, shall comply with other applicable District Rules.

F.5 Bureau of Land Management (BLM) Requirements

The BLM shall prepare a d ust c ontrol p lan to minimize PM10 emissions for

sources under the control of BLM. The d ust c ontrol p lan shall include at a

minimu m the following:

F.5.a A stipulation that all new authorizations for point and area stationary emission sources obtain all necessary permits and satisfy all applicable SIP provisions, including project

- or activity

- specific BACM;

F.5.b A summary of : the total miles of BLM roads that are paved, paved with unpaved shoulders, and unpaved roads with 50 or more average vehicle trips per day, including length and level of usage of each such road; the priority for control of road segments based on annual and ep isodic (e.g. event) usage; the plans for control of PM

- 10 emissions from these roads; the location and extent (e.g. acreage) of open areas disturbed by legal and illegal R ecreational U se; the priorit y for control of these open areas based on annual and epi sodic (e.g. event) usage; the plans for control of PM

- 10 emissions from these areas;

F.5.c BLM must demonstrate in its d ust c ontrol p lan that U npaved Roads, parking, and O

pen A reas are controlled pursuant to the applicability and requirements of Rules 80 4 and 805 except where measures are demonstrated by BLM to be prohibited by federal or state laws, regulations, or approved plans concerning wilderness preservation andImperial County Air Pollution Control District DRAFT Rule 800

October 7, 2005

11

species management and recovery.

F.5. d Where compliance with any control measure in R ules 804 and 805 is prohibited pursuant to F.5. c , the d ust c ontrol p lan must discuss and commit to implement other possible control measures , such as vehicle speed limits

.

F.5. e The d ust c ontrol p lan must describe all PM

- 10 control measures that will

be i mplemented, such as restricted use areas, stabilization of U npaved

T raffic A reas and current RAMP measures, to reduce PM10 emissions during off

- road events and/or competitions on public land and include all those measures that are feasible and not prohibit ed by the laws, regulations and plans described in F.5. c ;

F.5. f Use BLM

- standard road design and drainage specifications when maintaining existing roads or authorizing road maintenance and new road construction; and

F.5.g Include public educational infor mation on reducing PM

- 10 emissions with BLM open area literature (e.g. identification of restricted areas and/or applicable speed limits) and on related information signs in heavily used

areas.

F.6

. Border Patrol (BP) Requirements

The BP shall prepare a d ust c ontrol p lan designed to minimize PM10 emissions from sources under the control of the BP. The dust control plan shall include

those dust control measures found in Rules 804 and 805 that are not inconsistent with the BP’s authority and/or mission. T he d ust c ontrol p lan shall include the following fugitive dust control measures:

F.6.a A stipulation that all new authorizations for point and area stationary emission sources obtain all necessary permits and satisfy all applicable SIP provisions, includi

ng project

- or activity

- specific BACM;

F.6.b Implement alternatives to tire

- dragging that result in fewer PM10 emissions, when such alternatives are consistent with the monitoring of immigration across the U.S.

- Mexico border; and

F.6.c Control dust emiss ions from certain U npaved R oads and routes owned or operated by the BP as identified through general BP planning consistent

with Rule 805 unless those dust control measures are demonstrated to be inconsistent with BP authority and/or mission.Imperial County Air Pollution Control District DRAFT Rule 800

October 7, 2005

12 F. Requireme nts

F.1 Any Person who engages in any Active Operations identified in Section F of this rule shall provide for the implementation and maintenance of applicable RACM s
, unless the implementation of such RACM endangers or could endanger the health or safety of the public.

F.2 Track Out/Carry Out: Any Person who causes the deposition of Bulk Material by tracking out or carrying out onto a Paved Road surface shall apply one or more applicable RACM to prevent or mitigate such deposition.

F.3 Unpaved Haul/Acc ess Roads: No Person shall cause, suffer or allow the operation, use, or maintenance of any Unpaved Haul/Access Road of more than 1⁄2 mile in length at any work site without applying one or more appropriate so as

to affect at least 15% of the total road s urface(s) or apply one or more RACM so as to achieve a level of control that is equivalent to 100% control of emissions from 15% of the total unpaved surface(s).

F.4 Unpaved Roads: All Persons who cause, suffer or allow the operation, use or

maintenance of any Unpaved Road, greater than 3/4 mile in length, and with 20.0 or more average VMT per mile per day shall apply one or more appropriate RACM as to affect at least 15% of the total road surface(s) or apply one or more

RACM so as to achieve a level o f control that is equivalent to 100% control of emissions from 15% of the total unpaved surface(s).

F.5 Bulk Material Handling: No Person shall cause, suffer, allow or engage in any Bulk Material handling operation including, but not limited to, storage, stacking, loading, unloading, conveying and reclaiming of Bulk Material, for industrial or commercial purposes without applying one or more appropriate RACM.

F.6 Material Transport: No Person shall cause, suffer, allow or otherwise engage in the transportation of Bulk Materials for industrial or commercial purposes, without applying one or more appropriate RACM.

F.7 Haul Trucks: No Person shall cause, suffer, allow or otherwise engage in the use or operation of any Haul Truck, for industr ial or commercial purposes, of transporting or storing Bulk Material without applying one or more appropriate

RACM.

G. Administrative Requirements

G.1 Test Methods

G.1. a Determination of VDE OpacityImperial County Air Pollution Control District DRAFT Rule 800

October 7, 2005

13

Opacity observations to determine compliance with VD E standards shall be conducted in accordance with the test procedures for “Visual Determination of Opacity” as described in Appendix A of this rule. Opacity observations for sources other than unpaved traffic areas (e.g., roads, parking areas) shall be co nducted per Section B of Appendix A and shall require 12 readings at 15

- second intervals.

G.1. b Determination of Stabilized Surface

Observations to determine compliance with the conditions specified for a stabilized surface, in any inactive disturbed sur face area, whether at a work site that is under construction, at a work site that is temporarily or permanently inactive, or on an open area and vacant lot, shall be conducted in accordance with the test methods described in Appendix B of

this rule. If a disturbed surface area passes any of the specified tests, then

the surface shall be considered stabilized.

G.1. c Determination of Soil Moisture Content

Soil moisture content shall be determined by using ASTM Method D2216

- 98 (Standard Test Method for Labo ratory Determination of Water [Moisture] Content of Soil and Rock by Mass), or other equivalent test methods approved by the EPA, ARB, and the APCO.

G.1. d Determination of Silt Content for Bulk Materials

Silt content of a Bulk M aterial shall be determine d by ASTM Method C136a (Standard Test Method for Sieve Analysis of Fine and Coarse Aggregates), or other equivalent test methods approved by EPA, ARB,

and the APCD.

G.1. e Determination of Silt Content for Unpaved Roads and Unpaved Vehicle/Equipment Traffi c Areas

Silt Content for U npaved R oads and U npaved

Traffic A

reas shall be determined by using Section C of Appendix B of this Rule or other equivalent test methods approved by EPA, ARB, and the APCO.

G.1. f Determination of Threshold Friction Velocity (T FV)

TFV shall be determined by using Section D of Appendix B of this Rule or other equivalent test methods approved by EPA, ARB, and the APCO.Imperial County Air Pollution Control District DRAFT Rule 800

October 7, 2005

14 G

. Record of Control Implementation

Any Person engaged in any Active Operation subject to this Regulation VII I shall

maintain records of R ACM sufficient to establish location

, type and date of treatment. Records shall be maintained and be readily accessible for two years after the date of each entry and shall be provided to the APCD upon request and shall be ope n for inspection during unscheduled audits d uring normal business hours.

Persons who opt for the equivalency control in sections F.3 and/or F.4 must keep records to include equivalency formulas or factors with at least one sample calculation.

H

. Record

of Control Implementation

Any P erson subject to the requirements of this rule shall compile and retain records that provide evidence of control measure application and compliance with this rule (i.e., receipts and/or purchase records). Such P erson shall describe, in the records, the type of treatment or control measure, extent of coverage, and date applied. For control measures which require multiple daily applications

, recording the frequency of application will fulfill the recordkeeping requirements of this rule (i.e., water being applied three times a day and the date ) Records shall be maintained and be readily accessible for two years after the date of each entry and shall be provided to the APCD upon request.

H I

. Violations

Failure to comply with a ny of the provisions of this Regulation shall constitute a violation of this Regulation. Failure to comply with the provisions of an APCO approved d ust

c ontrol p lan shall also constitute a violation of this Regulation. Regardle ss of whether an APCO approv

ed du st c ontrol

p lan is being i mplemented or not, or whether a Person responsible for an Active Operation(s) is complying with an approved d ust c ontrol p lan, the Person is still subject to the requirements of Regulation VIII at all times.

I. Reasonably Av

ailable Control Measures for Fugitive Dust (PM

- 10)

I.1 UNPAVED HAUL AND ACCESS ROADS:

I.1.a Pave.

I.1.b Apply Physical/ Chemical Stabilization as directed by product manufacturer to control dust on Unpaved Roads.

I.1.c Apply Gravel, recrushed/rec ycled asphalt or other material of low Silt (<5%) content to a depth of three or more inches.Imperial County Air Pollution Control District DRAFT Rule 800

October 7, 2005

15

I.1.d Wetting. Apply water one or more times daily.

I.1.e Permanent road closure.

I.1.f Reduce vehicle speeds by 50%.

I.1.g Reduce vehicle trips by 50%.

I.2 UNPAVED ROADS:

I.2.a Pave.

I.2.b Apply Physical/Chemical Stabilization, as dire cted by product

manufacturer to control dust on Unpaved Roads.

I.2.c Apply Gravel, recrushed/recycled asphalt or other material of low Silt
(<5%) content to a depth of three or more inches.

I.2.d Reduce vehicle speeds by 50% .

I.2.e Reduce number of vehicle trips by 50%.

I.2.f Wetting. Apply water one or more times daily.

I.2.g Stocking of Triploid Grass Carp in canals to reduce maintenance vehicle trips along Canal Banks to mechanically remove aquatic weeds.

I.2.h Installation of remote control delivery gates to eliminate manual gate operation by maintenance personnel in vehicles along Canal Banks.

I.2.i Implement policies and training to emphasize:

I.2.i.1 regulated use of field

- side Canal Banks for agricultural equipment parking/storage and agricultural commodity storage;

I.2.i.2 reduced speed along Canal Banks;

I.2.i.3 minimal use of Canal Banks for access to canal gate str uctures;

I.2.i.4 when feasible, restrict vehicle travel along Canal Bank to one side (opposite of field

- side Canal Bank).

I.2.j Implement Silt removal program to emphasize delaying grading of spoilImperial County Air Pollution Control District DRAFT Rule 800

October 7, 2005

16

piles deposited on Canal Bank after cleaning operations until the next cleaning operation to eliminate vehicle access to Canal Bank.

I.2.k Permanent road closure

.

I.2.l Conversion of open canals to pipeline.

I.2.m Lining canals to eliminate maintenance for Silt/weed control.

I.2.n Canal Bank surface maintenance.

I.3 TRACK OUT/CARRY OUT:

I.3.a Rapidly clean up, within 48 hours of deposition, any Bulk Material

tracked out or carried out onto a Paved Road surface.

I.3.b Install one or more Track

- Out Prevention Device s or other APCO approved t

rack out control device or wash down system at access points where unpaved traffic surfaces adjoin Paved Roads.

I.3.c Pave, Chemically Stabilize, or Gravel (using Gravel or other low Silt (<5%) content material), 50 or more consecutive feet at access po ints where Unpaved Roads adjoin Paved Roads

.

I.4 BULK MATERIAL HANDLING/TRANSFER:

I.4.a Spray with water 15 minutes prior to handling and/or at points of transfer.

I.4.b Chemical/Physical Stabilization.

I.4.c Protect from wind erosion by shelte ring or enclosing the operation and

transfer line.

I.5. MATERIAL TRANSPORT/HAULING:

I.5.a Completely cover or enclose all Haul Truck loads of Bulk Material.

I.5.b Haul Trucks transporting loads of Aggregate Materials shall not be required to cove r their loads if the load, where it contacts the side, front, and back of the cargo container area remains six inches from the upper area of the container area, and if the load does not extend, at its peak, above any part of the upper edge of the cargo con tainer area (As defined in Section 23114 of the California Vehicle Code for both public and private roads)

.Imperial County Air Pollution Control District DRAFT Rule 800

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17

I.5.c The cargo compartment(s) of all Haul Trucks are to be constructed and maintained so that no spillage and loss of Bulk Material can occur f rom holes or other openings in the cargo compartment's floor, side, and/or tailgate. Seals on any openings used to empty the load including, but not
limited to, bottom

- dump release gates and tailgates to be properly maintained to prevent the loss of Bulk M aterial from those areas.

I.5.d The cargo compartment of all Haul Trucks are to be cleaned and/or washed at delivery site after removal of Bulk Material.

J. Calexico/Mexicali Cross

- Border Source Apportionment Study

A PM

- 10 monitoring program was com pleted in 1993 along the border between Imperial Valley California and the Mexicali V alley, Baja California, Mexico to determine the major contributors to PM

- 10 and to determine how much was contributed by transport across the international boundary. This study was funded by the U.S. Envir onmental Protection Agency and conducted by the University of Nevada, Desert Research Institute Energy and Environmental Engineering Center. This study is expected to be published in final form by the end of the first qu arter of 1995. The Imperial County Air Pollution Control District (ICAPCD) will conduct a workshop on the study within thirty days of the formal publication date for the purpose of receiving public input on the results and

recommendations contained therei n. The comments received at that workshop and this Regulation will be reviewed by APCD staff and recommendations forwarded to the

ICAPCD Board of Directors.

K. RACM implementation

Reasonably Available Control Measure (RACM) implemented since the date of adoption of the State Implementation Plan (SIP) for PM

- 10 in the Imperial Valley (September 28,
1993) can be i ncluded as a portion of any amount of PM

- 10 control required in this Regulation

.Imperial County Air Pollution Control District DRAFT Rule 800

October 7, 2005

18 APPENDIX A Visual Determination of Opacity

SECTION A Test Method For Unpaved Roads and Unpaved Traffic Areas

SECTION B Test Method For Time

- Averaged Regulations

SECTION A TEST METHOD FOR UNPAVED ROADS AND UNPAVED TRAFFIC

AREAS

A. Opacity Test Method. The purpose of this test method is to estimate the p ercent opacity of Fugitive D ust plumes caused by vehicle movement on U npaved R oads and U npaved

T raffic A reas. This method can only be conducted by an individual who has current certification as a qualified observer.

A.1 Step 1: Stand at least 16.5 feet f rom the fugitive dust source in order to provide a

clear view of the emissions with the sun oriented in the 140° sector to the back. Following the above requirements, make opacity observations so that the line of vision is approximately perpendicular to t he dust plume and wind direction. If multiple plumes are involved, do not include more than one plume in the line of sight at one time.

A.2 Step 2: Record the Fu gitive D ust source location, source type, method of control used, if any, observer’s name, ce rtification data and affiliation, and a sketch of the

obser ver’s position relative to the F ugitive D ust source. Also, record the t ime,

estimated distance to the F ugitive D ust source location, approximate wind direction, estimated wind speed, description o f the sky condition (presence and color of

cloud s), observer’s position to the F ugitive D ust source, and color of the plume and type of background on the visible emission observation form both when opacity readings are initiated and completed.

A.3 Step 3: Make opacity observations, to the extent possible, using a contrasting background that is perpendicular to the line of vision. Make opacity observations approximately 1 meter above the surface from which the plume is generated. Note

that the observation

is to be made at only one visual point upon generation of a plume, as opposed to visually tracking the entire length of a dust plume as it is created along a surface. Make two observations per vehicle, beginning with the first reading at zero seconds and the second reading at five seconds. The zero

second observation should begin immediately after a plume has been created above the surface involved. Do not look continuously at the plume but, instead, observe the plume briefly at zero seconds and then ag ain at five seconds.

A.4 Step 4: Record the opacity observations to the nearest 5% on an observational record sheet. Each momentary observation recorded represents the average opacityImperial County Air Pollution Control District DRAFT Rule 800

October 7, 2005

19

of emissions for a 5

- second period. While it is not required by the te st method, EPA recommends that the observer estimate the size of the vehicles which generate dust plumes for which readings are taken (e.g. mid

- size passenger car or heavy

- duty truck.) and take the approximate speeds the vehicles are traveling when the rea dings are being taken.

A.5 Step 5: Repeat Step 3 (Section A.3. of this appendix) and Step 4 (Section A.4. of this appendix) until you have recorded a total of 12 consecutive opacity readings.

This will occur once six vehicles have driven on the source in your line of observation for which you are able to take proper readings. The 12 consecutive readings must be taken within the same period of observation but must not exceed 1 hour. Observations immediately preceding and following interrupted observation s
can be considered consecutive.

A.6 Step 6: Average the 12 opacity readings together. If the average opacity reading equals 20% or lower, the source is in compliance with the opacity standard described in the applicable rule.

SECTION B TEST METHOD FOR VISUAL DETERMINATION OF OPACITY OF

EMISSIONS FROM SOURCES FOR TIME

- AVERAGED REGULATIONS

B. Applicability. This method is applicable for the determination of the opacity of emissions

from sources of visible emissions for time

- averaged regulations. A time

- av eraged regulation is any regulation that requires averaging visible emission data to determine the opacity of visible emissions over a specific time period.

B.1 Principle. The opacity of emissions from sources of visible emissions is determined visually by a qualified observer who has received certification.

B.2 Procedures. A qualified observer who has been certified shall use the following procedures for visually determining the opacity of emissions.

B.2.a Position. Stand at a position at least 5 met ers from the F ugitive D ust source n order to provide a clear view of the emissions with the sun oriented in the 140° sector to the back. Consistent as much as possible with maintaining the above requirements, make opacity observations from a position such

that the line of sight is approximately perpendicular to the plume and wind direction . The observer may follow the F ugitive D ust plume generated by mobile earthmoving equipment, as long as the sun

remains oriented in the 140° sector to the back. As much as possible, if multiple plumes are involved, do not include more than one plume in the line of sight at one time.

B.2.b Field Records. Record the name of the site, F ugitive D ust source typeImperial County Air Pollution Control District DRAFT Rule 800

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20

(i.e., pile, material handling (i.e., transfer, loading, sorti ng)), method of control used, if any, observer’s name, certification data and affiliation,

and a sketch of the obser ver’s position relative to the F ugitive D ust source. Also, record the t ime, estimated distance to the F ugitive D ust source location, approx

imate wind direction, estimated wind speed, description of the sky condition (presence and color of clouds,) observer’s position relative to the fugitive dust source, and color of the plume and type of the background on the visible emission observation for m when opacity readings are initiated and completed.

B.2.c Observations. Make opacity observations, to the extent possible, using a contrasting background that is perpendicular to the line of sight. For storage piles, make opacity observations approxima tely 1 meter above the surface from which the plume is generated. For extraction operations and the loading of haul trucks in open

- pit mines, make opacity observations approximately one meter above the rim of the pit. The initial observation should begin

immediately after a plume has been created above the surface involved. Do not look continuously at the plume, but instead observe the plume momentaril y at 15

- second intervals. For F ugitive D ust
from E arth

m oving equipment, make opacity observations appro ximately 1 meter above the mechanical equipment generating the plume.

B.2.d Recording Observations. Record the opacity observations to the nearest 5% every 15 seconds on an observational record sheet. Each momentary observation recorded represents the a verage opacity of emissions for a 15

- second period. If a multiple plume exists at the time of an observation, do not record an opacity reading. Mark an “x” for that reading. If the equipment generating the plume travels outside of the field of observati on, resulting in the inability to maintain the orientation of the sun within the 140° sector or if the equipment ceases operating, mark an “x” for the 15

– second interval reading. Readings identified as “x” shall be considered interrupted readings.

B.2. e Data Reduction For Time

- Averaged Regulations. For each set of 12 or 24 consecutive readings, calculate the appropriate average opacity. Sets must consist of consecutive observations, however, readings immediately preceding and following interrupted rea dings shall be deemed consecutive and in no case shall two sets overlap, resulting in multiple violations.Imperial County Air Pollution Control District DRAFT Rule 800

October 7, 2005

21 APPENDIX B

Determination of Stabilization

SECTION A Test Methods for Determining Stabilization

SECTION B Visible Crust Determination

SECTION C Determination of Silt Content for Unpaved Roads and Unpaved

Vehicle/Equipment Traffic Areas

SECTION D Determination of Threshold Friction Velocity

SECTION E Determination of Flat Vegetative Cover

SECTION F Determination of Standing Vegetative Cover

SECTI ON G Rock Test Method

SECTION A TEST METHODS FOR DETERMINING STABLIZATION

The test methods described in Section B through Section G of this appendix shall be used

to d etermine whether an area has a S tabilized S urface. Should a disturbed area contain

m ore than one type of disturbance, soil, vegetation, or other characteristics, which are visibly distinguishable, test each representative surface separately for stability, in an area that represents a random portion of the overall disturbed conditions of t he site, according to the appropriate test methods in Section B through Section G of this appendix, and
include or eliminate it from the total size assessment of disturbed surface area(s) depending upon test method results.

SECTION B VISIBLE CRUST DETERMI NATION

B.1 Where a visible crust exists, drop a steel ball with a diameter of 15.9 millimeters (0.625 inches) and a mass ranging from 16

- 17 grams from a distance of 30 centimeters (one foot) directly above (at a 90° angle perpendicular to ) the soil surfa ce. If blowsand is present, clear the blowsand from the surfaces on which the visible crust test method is conducted. Blowsand is defined as thin deposits of loose uncombined grains covering less than 50% of a site which have not originated from the repr esentative site surface being tested. If material covers a visible crust, which is not blowsand, apply the test method in Section D of this appendix to the loose material to determine whether the

surface is stabilized.

B.2 A sufficient crust is defined u nder the following conditions: once a ball has been dropped according to section B.1 of this appendix, the ball does not sink into the surface, so that it is partially or fully surrounded by loose grains and, upon removing the ball, the surface upon which it fell has not been pulverized, so that loose grains are visible.

B.3 Drop the ball three times within a survey area that measures 1 foot by 1 foot and that represents a random portion of the overall disturbed conditions of the site. The surveyImperial County Air Pollution Control District DRAFT Rule 800

October 7, 2005

22 area sha ll be considered to have passed the Visible Crust Determination Test if the results of at least two out of the three times that the ball was dropped, met the criteria in section B.2 of this appendix. Select at least two other survey areas that represent a random portion of the overall disturbed conditions of the site, and repeat this procedure. If the results meet the criteria of section B.2 of this appendix for all of the survey areas tested, then the site shall be considered to have passed the Visible C rust Determination Test and shall be considered sufficiently crusted.

B.4 At any given site, the existence of a sufficient crust covering one portion of the site may not represent the existence or protectiveness of a crust on another portion of the site. Repeat the visible crust test as often as necessary on each random portion of the overall

conditions of the site for an accurate assessment.

SECTION C DETERMINATION OF SILT CONTENT FOR UNPAVED ROADS AND

UNPAVED VEHICLE/EQUIPMENT TRAFFIC AREAS

The purpo se of this test method is to estimate the silt cont ent of the trafficked parts of Unpaved R

oads and U npaved vehicle/equipment T raffic A reas. The higher the S ilt content, the more fine dust particles that are re leased when vehicles travel on U npaved

R oads and U npaved vehicle/equipment T raffic A reas.

C.1 Equipment:

C.1.a. A set of sieves with the following openings: 4 millimeters (mm), 2mm, 1mm, 0.5mm and 0.25 mm, a lid, and collector pan.

C.1.b A small whisk broom or paintbrush with stiff bristles and dus tpan 1 ft. in width (the broom/brush should preferably have one, thin row of bristles no longer than 1.5 inches in length.)

C.1.c A spatula without holes.

C.1.d A small scale with half

- ounce increments (e.g., postal/package scale.)

C.1.e A shallow, lightwe ight container (e.g., plastic storage container.)

C.1.f A sturdy cardboard box or other rigid object with a level surface. C.1.g A basic calculator.

C.1.h Cloth gloves (optional for handling metal sieves on hot, sunny days.)

C.1.i Sealable plastic bags (if sending samples to a laboratory.) C.1.j A pencil/pen and paper.

C.2 Step 1: Look for a routinely traveled surface, as evidenced by tire tracks. Only collect samples from surfaces that are not damp due to precipitation or dew. This statement is

not meant to be a standard in itself for dampness where watering is being used as a control measure. It is only intended to ensure that surface testing is done in a representative manner. Use caution when taking samples to ensure personal safety with

respect to p

assing vehicles. Gently press the edge of a dustpan (1 foot in width) into the surface four times to mark an area that is 1 square foot. Collect a sample of loose surfaceImperial County Air Pollution Control District DRAFT Rule 800

October 7, 2005

23 material into the dustpan, minimizing escape of dust particles. Use a spatula to l ift heavier elements such as gravel. Only collect dirt/ G ravel to an approximate depth of 3/8 inch or 1 cm in the 1 square foot area. If you reach a hard, underlying subsurface that is <3/8 inch in depth, do not continue collecting the sample by digging i nto the hard surface. In other words, you are only collecting a surface sample of loose material down to 1 cm. In order to confirm that samples are collected to a 1cm depth, a wooden dowel or other similar narrow object at least one

- foot in length can be laid horizontally across the survey area while a metric ruler is held perpendicular to the dowel. (Optional: At this point, you can choose to place the sample collected into a plastic bag or container and take it to an independent laboratory for silt con tent analysis. A reference to the procedure the laboratory is required to follow is at the end of this section.)

C.3 Step 2: Place a scale on a level surface. Place a lightweight container on the scale. Zero the scale with the weight of the empty conta iner on it. Transfer the entire sample collected in the dustpan to the container, minimizing escape of dust particles. Weigh the sample and record its weight.

C.4 Step 3: Stack a set of sieves in order according to the size openings specified above, beg inning with the largest size opening (4mm) at the top. Place a collector pan underneath the bottom (0.25mm) sieve.

C.5 Step 4: Carefully pour the sample into the sieve stack, minimizing escape of dust particles by slowly brushing material into the stack with a whiskbroom or brush. On windy days, use the trunk or door of a vehicle as a wind barrier. Cover the stack with a lid. Lift up the sieve stack and shake it vigorously up and down and sideways for at least

1 minute.

C.6 Step 5: Remove the lid from the stack and disassemble each sieve separately, beginning with the top sieve. As you remove each sieve, examine it to make sure that all of the material has been sifted to the finest sieve through which it can pass (e.g., material in
each sieve (besides the top sieve that captures a range of larger elements) should look the same size.) If this is not the case, re

- stack the sieves and collector pan, cover the stack with the lid, and shake it again for at least 1 minute. You only need to reassemble the

s ieve(s) that contain material, which require further sifting.

C.7 Step 6: After disassembling the sieves and collector pan, slowly sweep the material from the collector pan into the empty container originally used to collect and weigh the entire sample. Take care not to minimize escape of dust particles. You do not need to do anything with material captured in the sieves

–only the collector pan. Weigh the container with the materials from the collector pan and record its weight.

C.8 Step 7: If the sou rce is an unpaved road, multiply the resulting weight by 0.38. If the

source is an U

npaved vehicle/equipment T raffic A rea, multiply the resulting weight by

0.55. The res ulting number is the estimated s ilt loading. Then, divide the total weight ofImperial County Air Pollution Control District DRAFT Rule 800

October 7, 2005

24 the sa mple you recorded earlier in Step 2 (Section C.4) and multiply by 100 to estimate the percent S ilt content.

C.9 Step 8: Select another two rout inely traveled portions of the U npaved R oad or U npaved vehicle/equipment T

raffic A rea and repeat this test metho d. Once you have calculated the silt loading and percent silt content of the 3 samples collected, average your results together.

C.10 Step 9: Examine Results. If the average silt loading is less than 0.33 oz/ft 2 , the surface is STABLE. If the average s ilt loading is greater than or equal to 0.33 oz/ft 2 , then proceed to examine the average percent S ilt content. If the source is an U npaved R oad and the

average percent S ilt content is 6% or less, the surface is STABLE. If the source is an unpaved parking

lot and the average percent S ilt content is 8% or less, the surface is STABLE. If your field test results are within 2% of th e standard (for example, 4%

- 8%

S ilt content on an U npaved R oad) it is recommended that you collect 3 additional samples from the source according to Step 1 (section C. 2 ) and take them to an independent laboratory for S ilt content analysis.

C.11 Independent Laboratory Analysis: You may choose to collect samples from the source, according to Step 1 (section C. 2 ) and send them to an independe nt laboratory for S ilt content analysis rather than conduct the sieve field procedure. If so, the test method the laboratory is required to use is: “Procedures For Laboratory Analysis for Surface/Bulk Dust Loading Samples,” (Fifth Edition, Volume 1, Appendix C.2.3 “Silt Analysis,” 1995,) AP

- 42, Office of Air Quality Planning & Standards, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina.

SECTION D DETERMINATION OF THRESHOLD FRICTION VELOCITY (TFV)

For disturbed surfac e areas that are not crusted or vegetated, determine threshold friction velocity (TFV) according to the following sieving field procedure (based on a 1952 laboratory procedure published by W.S. Chepil).

D.1 Obtain and stack a set of sieves with the follow ing openings: 4 millimeters (mm), 2 mm, 1 mm, 0.5 mm, and 0.25 mm or obtain and stack a set of standard/commonly available sieves. Place the sieves in order according to size openings, beginning with the largest size opening at the top. Place a collector pan underneath the bottom (0.25 mm) sieve. Collect a sample of loose surface material from an area at least 30 cm by 30 cm in size to a depth of approximately 1 cm using a brush and dustpan or other similar device. Only collect soil samples from dry sur faces (i.e. when the surface is not damp to the touch). Remove any rocks larger than 1 cm in diameter from the sample. Pour the sample into the top sieve (4 mm opening) and cover the sieve/collector pan unit with a lid. Minimize escape of particles into the air when transferring surface soil into the sieve/collector pan unit. Move the covered sieve/collector pan unit by hand using a broad, circular arm motion in the horizontal plane. Complete twenty circular arm movements, ten clockwiseImperial County Air Pollution Control District DRAFT Rule 800

October 7, 2005

25 and ten counter clockwise, at a speed just necessary to achieve some relative horizontal motion between the sieves and the particles. Remove the lid from the sieve/collector pan unit and disassemble each sieve separately beginning with the largest sieve. As each

sieve i s removed, examine it for loose particles. If loose particles have not been sifted to the finest sieve through which they can pass, reassemble and cover the sieve/collector pan unit and gently rotate it an additional ten times. After disassembling the si eve/collector pan unit, slightly tilt and gently tap each sieve and the collector pan so that material aligns along one side. In doing so, minimize escape of particles into the air. Line up the sieves and collector pan in a row and visibly inspect the re lative quantities of catch in order to determine which sieve (or whether the collector pan) contains the greatest volume of material. If a visual determination of relative volumes of catch among sieves is difficult, use a graduated cylinder to measure the volume. Estimate TFV for the sieve catch with the greatest volume using Table 1 of this appendix, which provides a correlation between sieve opening size and TFV.

Table 1. Determination of Threshold Friction Velocity (TFV)

Tyler Sieve No. ASTM 11

Sieve No. Opening

(mm) TFV

(cm/s)

5 5 4 135

9 10 2 100

16 18 1 76

32 35 0.5 58

60 60 0.25 43

Collector Pan

--- --- 30

D.2 Collect at least three soil samples which represent random portions of the overall conditions of the site, repeat the above TFV tes t method for each sample and average the resulting TFVs together to determine the TFV uncorrected for non erodible elements.

Non

- erodible elements are distinct elements, in the random portion of the overall conditions of the site, that are larger than 1 c m in diameter, remain firmly in place during a wind episode, and inhibit soil loss by consuming Section of the shear stress of the wind.

Non

- erodible elements include stones and bulk surface material but do not include flat or standing vegetation. For su rfaces with non

- erodible elements, determine corrections to the TFV by identifying the fraction of the survey area, as viewed from directly overhead, that is occupied by non

- erodible elements using the following procedure. Select a survey

area of 1 meter by 1 meter that represents a random portion of the overall conditions of the site. Where many non

- erodible elements lie within the survey area, separate the non

erodible elements into groups according to size. For each group, calculate the overhead

area for the non

- erodible elements according to the following equations:Imperial County Air Pollution Control District DRAFT Rule 800

October 7, 2005

26 Average Dimensions = (Average Length) x ( Average Width) Eq. 1

Overhead Area = (Average Dimensions) x (Number of Elements) Eq. 2

Total Overhead Area = Overhead Area Of Group 1 + Over head Area of Group 2 (etc) Eq. 3

Total Frontal Area =

Total Overhead Area/2 Eq. 4

Percent Cover of Non

- Erodible Elements = (Total Frontal Area/Survey Area) x 100 Eq. 5

Note: Ensure consistent units of measurements (e.g., square meters or square inc hes when calculating percent cover).

Repeat this procedure on an additional two distinct survey areas that represent a random portion of the overall conditions of the site and average the results. Use Table 2 of this appendix to identify the correction factor for the percent cover of non

- erodible elements. Multiply the TFV by the corresponding correction factor to calculate the TFV corrected

for non

- erodible elements.

Table 2. Correction Factors for Threshold Friction Velocity

Percent Cover of Non

- Er odible Elements Correction Factor Greater than or equal to 10% 5 Greater than or equal to 5% and less than 10% 3 Less than 5% and greater than or equal to 1% 2

Less than 1% None

SECTION E DETERMINATION OF FLAT VEGETATIVE COVER

Flat vegetation inclu des attached (rooted) vegetation or unattached vegetative debris lying on the surface with a predominant horizontal orientation that is not subject to movement by wind. Flat vegetation, which is dead but firmly attached, shall be considered equally protec tive as live vegetation. Stones or other aggregate larger than 1Imperial County Air Pollution Control District DRAFT Rule 800

October 7, 2005

27 centimeter in diameter shall be considered protective cover in the course of conduction the line transect test method. Where flat vegetation exists conduct the following line

transect test method.

E.1 Line Transect Test Method. Stretch a 100 foot measuring tape across a survey area that represents a random portion of the overall conditions of the site. Firmly anchor both ends of the measuring tape into the surface using a tool such as a s crewdriver, with the tape stretched taut and close to the soil surface. If vegetation exists in regular rows, place the tape diagonally (at approximately a 45° angle) away from a parallel or perpendicular position to the vegetated rows. Pinpoint an area the size of a 3/32 inch diameter brazing rod or wooden dowel centered above each 1 foot interval mark along one edge of the tape. Count the number of times that flat vegetation lies directly underneath the pinpointed area at 1 foot intervals. Consistentl y observe the underlying surface from a 90° angle directly above each pinpoint on one side of the tape. Do not count the underlying surface as vegetated if any portion of the pinpoint extends beyond the edge of the vegetation underneath in any direction. If clumps of vegetation or vegetative debris lie underneath the pinpointed area, count the surface as vegetated, unless bare soil is visible directly below the pinpointed area. When 100 observations have been made, add together the number of times a surf ace was counted as vegetated. This total represents the percent of flat vegetations cover (e.g., if 35 positive counts were made, then vegetation cover is 35%.) If the survey area that represents a random portion of the

overall conditions of the site is too small for 100 observations, make as many observations as possible. Then multiply the count of vegetated surface areas by the appropriate conversion factor to obtain percent cover. For example, if vegetation was

counted 20 times within a total of 50 o bservations, divide 20 by 50 and multiply by 100 to obtain a flat vegetation cover of 40%.

E.2 Conduct the line transect test method, as described in section E.1 of this appendix, an additional two times on areas that represent a random portion of the ove rall conditions of the site and average results.

SECTION F DETERMINATION OF STANDING VEGETATIVE COVER.

Standing vegetation includes vegetation that is attached (rooted) with a predominant vertical orientation. Standing vegetation, which is dead but fir mly rooted, shall be considered equally protective as live vegetation. Conduct the following standing vegetation test method to determine if 30% cover or more exists. If the resulting percent cover is less than 30% but equal to or greater than 10%, then conduct the test in Section D; “Determination Of Threshold Friction Velocity (TFV,) of this appendix in order to determine if the site is stabilized, such that the standing vegetation cover is equal to or greater than 10%, where threshold friction velocity , corrected for non

- erodible elements, is equal to or greater than 43cm/second.

F.1 For standing vegetation that consists of large, separate vegetative structures (e.g., shrubsImperial County Air Pollution Control District DRAFT Rule 800

October 7, 2005

28 and sagebrush,) select a survey area that represents a random portion of the o verall conditions of the site that is the shape of a square with sides equal to at least 10 times the average height of the vegetative structures. For smaller standing vegetation, select a survey area of three feet by three feet.

F.2 Count the number of standing vegetative structures within the survey area. Count vegetation, which grows in clumps as a single unit. Where different types of vegetation exist and/or vegetation of different height and width exists, separate the vegetative

structures with sim ilar dimensions into groups. Count the number of vegetative structures in each group within the survey area. Select an individual structure within each group that represents the average height and width of the vegetation in the group. If

the structure i

s dense (e.g., when looking at it vertically from base to top there is little or zero open air space within its perimeter,) calculate and record its frontal silhouette area, according to Equation 6 of this appendix. Also, use Equation 6 of this appendix t o estimate the average height and width of the vegetation if the survey area is larger than nine square feet. Otherwise, use the procedure in section F.3 of this appendix to calculate the frontal silhouette area. Then calculate the percent cover of stand ing vegetation according to Equations 7, 8, and 9 of this appendix.

Frontal Silhouette Area = (Average Height) x (Average Width) Eq. 6

Frontal Silhouette Area Of Group= (Frontal Silhouette Area Of Individual Vegetative Structure) x (Number Of Vegetation S tructures Per Group) Eq. 7

Total Frontal Silhouette Area = Frontal Silhouette Area Of Group 1 + Frontal Silhouette Area Of Group 2 (etc.) Eq. 8

Percent Cover Of Standing Vegetation = (Total Frontal Silhouette Area/Survey Area) x 100 Eq. 9

Percent Open S pace = [(Number Of Circled Gridlines Within The Outlined Area Counted That Are Not Covered By Vegetation/Total Number Of
Gridline Intersections Within The Outlined Area) x 100] Eq.10

Percent Vegetative Density =

100

–Percent Open Space Eq. 11

Vegetative Density = Percent Vegetative Density/100 Eq. 12

Frontal Silhouette Area = [Max. Height x Max. Width] x [Vegetative Density/.04]o.5 Eq. 13Imperial County Air Pollution Control District DRAFT Rule 800

October 7, 2005

29 Note: Ensure consistent units of measurement (e.g., square meters or square inches when

c alculating percent cover.)

F.3. Vegetative Density Factor. Cut a single, representative piece of vegetation (or consolidated vegetative structure) to within 1cm of surface soil. Using a white paper grid or transparent grid over white paper, lay the veg etation flat on top of the grid (but do not apply pressure to flatten the structure.) Grid boxes of 1 inch or 1⁄2 inch squares are sufficient for most vegetation when conducting this procedure. Using a marker or pencil, outline the shape of the vegetation along its outer perimeter, according to Figure B, C, or D of this appendix, as appropriate. (Note: Figure C differs from Figure D primarily in that the width of vegetation in Figure C is narrow at its base and gradually broadens to its tallest height. In

Figure D, the width of the vegetation generally becomes narrower from its midpoint to its tallest height.) Remove the vegetation, count and record the total number of gridline intersections within the outlined area, but do not count gridline

intersecti ons that connect with the outlined shape. There must be at least 10 gridline intersections within the outlined area and preferably more than 20, otherwise, use smaller grid boxes. Draw small circles (no greater than a 3/32 inch diameter) at each gridline intersection counted within the outlined area. Replace the vegetation on the grid within its outlined shape. From a distance of approximately 2 feet directly above the grid, observe each circled gridline intersection. Count and record the number of cir cled gridline intersections that are not covered by any piece of the vegetation. To calculate percent vegetative density, use Equations 10 and 11 of this appendix. If percent vegetative density is equal to or greater than 30, use an equation (one of the equations

Equations 16, 17, or 18 of this appendix) that matches the outline used to trace the vegetation (Figure B, C, or D) to calculate its frontal silhouette area. If percent vegetative density is less than 30, use Equations 12 and 13 of this appendix to calculate

the frontal silhouette area.

Figure B. Cylinder

Frontal Silhouette Area = Maximum Height x Maximum Width Eq.16Imperial County Air Pollution Control District DRAFT Rule 800

October 7, 2005

30 Figure C. Inverted Cone

Frontal Silhouette Area = Maximum Height x 1⁄2 Maximum Width Eq. 17

Figure D. U

pper Sphere

Frontal Silhouette Area = (3.14 x Maximum Height x 1⁄2 Maximum Width)/2 Eq.18

SECTION G ROCK TEST METHOD

The Rock Test Method, which is similar to Section D, Test Methods For Stabilization

Determination Of Threshold Friction Veloci ty (TFV) of this appendix, examines the

wind

- resistance effects of rocks and other non

- erodible elements on disturbed surfaces.

Non

- erodible elements are objects larger than 1 centimeter (cm) in diameter that remain firmly in place even on windy days. T y pically, non

- erodible elements include rocks, stones, glass fragments, and hardpacked clumps of soil lying on or embedded in the surface. Vegetation does not count as a non

- erodible element in this method. The purpose of this test method is to estimate t he percent cover of non

- erodible elements on a given surface to see whether such elements take up enough space to offer protection against windblown dust. For simplification, the following test method refers to all non

erodible elements as ‘rocks.”

G.1 S elect a 1 meter by 1 meter survey area that represents the general rock distribution onImperial County Air Pollution Control District DRAFT Rule 800

October 7, 2005

31 the surface. A 1 meter by 1 meter area is slightly greater than a 3 foot by 3 foot area.

Mark

- off the survey area by tracing a straight, visible line in the dirt alon g the edge of a measuring tape or by placing short ropes, yard sticks, or other straight objects in a square around the survey area.

G.2 Without moving any of the rocks or other elements, examine the survey area. Since rocks >3/8 inch (1cm) in diameter are of interest, measure the diameter of some of the smaller rocks to get a sense of which rocks need to be considered.

G.3 Mentally group the rocks >3/8 inch (1cm) diameter lying in the survey area into small, medium, and large size categories. Or, if t he rocks are all approximately the same size, simply select a rock of average size and typical shape. Without removing any of the rocks from the ground, count the number of rocks in the survey area in each group and write down the resulting number.

G.4 W ithout removing rocks, select one or two average

- size rocks in each group and measure the length and width. Use either metric units or standard units. Using a calculator, multiply the length times the width of the rocks to get the average dimensions of t he rocks in each group. Write down the results for each rock group.

G.5 For each rock group, multiply the average dimensions (length times width) by the number of rocks counted in the group. Add the results from each rock group to get the total rock

are a within the survey area.

G.6 Divide the total rock area, calculated in section G.5 of this appendix, by two (to get frontal area.) Divide the resulting number by the size of the survey area (make sure the units of measurement match,) and multiply by 100 for percent rock cover. For example, the total rock area is 1,400 square centimeters divide 1,400 by 2 to get 700. Divide 700 by 10,000 (the survey area is 1 meter by 1 meter, which is 100 centimeters by 100 centimeters or 10,000 centimeters) and multip ly by 100. The result is 7% rock cover. If rock measurements are made in inches, convert the survey area from meters to inches (1 inch = 2.54 centimeters.)

G.7 Select and mark

- off two additional survey areas and repeat the procedures described in

sectio n G.1 through section G.6 of this appendix. Make sure the additional survey areas also represent the general rock distribution on the site. Average the percent cover results from all three survey areas to estimate the average percent of rock cover.

G.8 If the average rock cover is greater than or equal to 10%, the surface is stable. If the average rock cover is less than 10%, follow the procedures in section G.9 of this appendix.

G.9 If the average rock cover is less than 10%, the surface may or may no t be stable. Follow the procedures in Section D.3 Determination Of Threshold Friction Velocity (TFV) ofImperial County Air Pollution Control District DRAFT Rule 800

October 7, 2005

32 this rule and use the results from the rock test method as a correction (i.e., multiplication) factor. If the rock cover is at least 1%, such rock cov er helps to limit windblown dust. However, depending on the soil’s ability to release fine dust particles into the air, the percent rock cover may or may not be sufficient enough to stabilize the surface. It is also possible that the soil itself has a hi gh enough TFV to be stable without even accounting

for rock cover.

G.10 After completing the procedures described in Section G.9 of this appendix, use Table 2 of this appendix to identify the appropriate correction factor to the TFV, depending on the

perc ent rock cover.Imperial County Air Pollution Control District Rule 800

800

- 1 RULE 80 0 GENERAL REQUIREMENTS F OR CONTROL OF FINE PARTICULATE MATTER (PM

- 10) (Adopted 10/10/94; revised 11/25/96 ; r evised 11/08/2005 )

A. General Description

The purpose of this regulation is to reduce the amount of fine Particulate Matter (PM

- 10)

entrai ned in the ambient air as a result of emissions generated from anthropogenic (man

- made) Fugitive Dust (PM

- 10) sources generated from within Imperial County by requiring actions to prevent, reduce, or mitigate PM

- 10 emissions. The Rules contained

with in th is Regulation have been developed pursuant to United States Environmental Protection Agency guidance for Serious PM10 Non Attainment Areas.

B. Applicability

The requirements of this r ule shall apply to any Active Operation, and/or man

- made or

man

- cause d condition or practice capable of generating Fugitive Dust (PM

- 10) as specified in this Regulation except those determined exempt as defined in Part E of this

Rule

. The definitions, exemptions, requirements, administrative requirements recordkeeping requi rements, and test methods set forth in this rule are applicable to all

the rules under Regulation VIII (F ugitive Dust Requirements) of the Rules and Regulations of the Imperial County Air Pollution Control District.

C. Definitions

For the purpose of th

is Regulation, the following terms are defined:

C.1 ACTIVE OPERATION: Activities capable of generating Fugitive Dust (PM

- 10)

, including but not limited to, E arthmoving A ctivities, C onstruction activities,

U npaved R

oads, T rack

- O ut/ C arry

- O ut, B ulk M aterial

storage and transport,

U npaved H aul/ A ccess R

oads

.

C.2 AGGREGATE MATERIALS: C onsists o

f sand, G ravel, quarried stone and/or rock fragme nts that are typically used in C onstruction. Aggregates may be natural, artificial or recycled.

C.3 ANEMOMETRS: Are devices used to measure wind speed and direction in

accordance with manufacturer’s performance standards, maintenance and

calibration criteria.

C.4 ANNUAL AVERAGE DAILY VEHICLE TRIPS: annual average 24

- hour total

of all vehicles counted on a road.

C. 5 APCD: The Imperial County Air Pollution Control District.

C

. 6 APCO: The Imperial County Air Pollution Control Officer.Imperial County Air Pollution Control District Rule 800

800

- 2 C. 7 AVERAGE VEHICLE TRIPS PER DAY: Means the average number of vehicles that cross a given point surface during a specific 24

- hour per iod as determined by the most recent Institute of Transportation Engineers trip generation manual, tube
counts, or observations.

C. 8 BLM: The Bureau of Land Management.

C. 9 BP: The United States Border Patrol.

C

. 10 BULK MATERIAL: Earth, rock, Silt, se diment, sand, Gravel, soil, fill,

A ggregate, dirt, mud, debris, and other organic and/or inorganic material consisting of or containing Particulate Matter with five percent or greater Silt

content. For the purpose of this Regulation , the S ilt content level

is assumed to be 5 percent or greater, unless the P erson responsible for the Active Operation conducts the applicable laboratory tests and demonstrate that the S ilt content is less than 5 percent

. Active Operations seeking to determine if the Silt conten t is less than five percent are required to conduct the laboratory analysis in

accordance with ASTM method C

- 136

- a (Standard Test Method for Sieve analysis of Fine and Coarse Aggregates), or other equivalent test methods approved by EPA, ARB, and the APCD

.

C

. 1 1 CANA

L BANK: A rise of land on either side of an irrigation canal.

C

. 12 CHEM ICAL STABILIZATION/SUPPRESSION: A means of Fugitive Dust (PM

- 10) control implemented to mitigate PM

- 10 emissions by applying petroleum resins, asphaltic emulsions, acryl ics, adhesives, or any other materials approved for use by the California Air Resources Board (CARB), U.S. Environmental Protection Agency ( U.S. EPA) and/or the APCO.

C.1 3 CONSTRUCTION : A ny on

- site mechanical activities preparatory to or related to

the b uilding, alteration, rehabilitation, or demolition of an improvement on real property, including, but not limited to, land clearing, excavation related to construction, land leveling, grading, cut and fill grading, and the erection or demolition of any str ucture. As used in Regulation VIII, a construction site may encompass several contiguous parcels, or may encompass only a portion of one parcel, depending on the relationship of the property boundaries to the actual

construction activities.

C

. 1 4 DESIGN ATED REPR ESENTATIVE: The agent for a Person. The Designated Representative shall be responsible for and have the full authority to implement

B ACM on behalf of the Person.

C.1 5 EARTHMOVING ACTIVITIES : The use of any equipment for an activity that

may g enerate F ugitive D ust emissions, including, but not limited to, cutting and filling, grading, leveling, excavation, tren ching, loading or unloading of B ulkImperial County Air Pollution Control District Rule 800

800

- 3 M aterials, demolishing, d rilling, adding to or removing b ulk of materials from open storage piles, w

eed abatement through disking, and back filling.

C

. 1 6 FUGITIVE DUST: The Particulate Matter entrained in the ambient air which is

caused from man

- made and natural activities such as, but not limited to, movement of soil, vehicles, equipment, blasting, an d wind. This excludes Particulate Matter emitted directly in the exhaust of motor vehicles or other fuel combustion devices, from portable brazing, soldering, or welding equipment, pile drivers, and stack emissions from stationary sources.

C

. 1 7 GRAVEL: Gravel travelways shall have a three (3) inch minimum depth

S tabilized S urface. The travelway shall have a relative compaction of not less

than 95% as determined by Test Method No. California 216 of State of California, Business and Transportation Agency D epartment of Transportation, and conforming to the following grading:

3⁄4” Maximum Sieve Designation Percent Passing

1” 100

3⁄4” 90

- 100

#4 35

- 60

#30 10

- 30

#200 2

- 9

Reference: California Department of Transportation Standard Specification Section 26/class II Aggregate Base

C

. 1 8 HAUL/ACCESS ROAD: Any on

- site road used for commercial, industrial, institutional, and/or governmental traffic.

C

. 1 9 HAUL TRUCK: Any fully or partially open

- bo died licensed motor vehicle used for transporting Bulk Material for industrial or commercial purposes.

C

. 20 IMPLEMENT OF HUSBANDRY: An unlicensed vehicle which is used exclusively in the condu ct of A gricultural O perations. An Implement of Husbandry does not include a vehicle if its existing design is primarily for the transportation of persons or property on a highway, unless specifically designated as such by some other provision of the Vehicle Code of California.

C. 2 1 NON

- RESIDENTIAL AREA: Any unpave d vehicle and equipment traffic area operated at any commercial, manufacturing or government sites

.

C.2 2 MODIFIED PAVED ROAD: Any P aved R oad that is widened or improved so as to increase traffic capacity. This term does not include road maintenanc e, repair, chip seal, pavement or roadbed rehabilitation that does not affect roadway geometrics, or surface overlay work.Imperial County Air Pollution Control District Rule 800

800

- 4 C. 2 3 OFF

- FIELD AGRICULTURAL SOURCE: Any Agricultural Source or activity at an Agricultural Source that falls into one or more of th e following categ

o ries:

C. 2 3 .a Outdoor handling, storage and transport of Bulk Material;

C. 23 .b Paved Road;

C. 23 .c Unpaved Road ; or

C. 23 .d Unpaved Traffic Area.

C

. 2 4 OFF

- ROAD VEHICLE: Any nonstationary device, powered by an internal

combustio n engine or motor, used primarily off the highways to propel, move, or draw persons or property including any device propelled, moved, or drawn exclusively by human power, and used in, but not li mited to, any of the following applications: marine vessels, construction/farm equipment, utility and lawn and garden equipment, off

- road motorcycles, and off

- highway vehicles.

C.2 5 ON

- FIELD AGRICULTURAL SOURCE: Any Agricultural Source or activity at an Agricultural Source that is not an Off

- Field Agricultural Sou

rce, including (but not limited to) the following:

C.2 5 .a Activities conducted solely for the purpose of preparing land for the growing of crops or the raising of fowl or animals, such as brush or timber clearing, grubbing, scraping, ground excavation, land leveling, grading, turning under stalks, disking, or tilling;

C.2 5 .b Dr y ing or pre

- cleaning of agricultural crop material on the field where it was harvested;

C.2 5 .c Handling or storage of agricultural crop material that is baled, cubed,

p e lleti zed, or long

- stemmed, on the field where it was harvested, and the handling of fowl or animal feed materials at sites where animals or fowl are raised;

C.2 5 .d Disturbances o f

cultivated land as a result of fallowing, planting, fertilizing or harvesting.

C.2 6 OPEN AREA: Any of the following described in Subsection C.2 6 .a through

C.2 6 .c of this rule. For the purpose of this rule, vacant portions of residential or commercial lots and contiguous parcels that are immediately adjacent to and owned and/or op erated by the same individual or entity are considered one open area. An open area does not include an y Unpaved Traffic Area as defined in this

rule.

C.2 6 .a An un

- subdivided or undeveloped land adjoining a developed (or partiallyImperial County Air Pollution Control District Rule 800

800

- 5 developed) residential, industrial, institutional, governmental, or

commercial area.

C.2 6 .b A subdivided residential, industrial, institutional, governmental, or commercial lot, which contains no approved or permitted building or structures of a temporary or permanent nature.

C.2 6 .c A partially developed residential, industrial

, institutional, governmental, or commercial lot and contiguous lots under common ownership.

C. 2 7 PARTICULATE MATTER: Any material, except uncombined water, which exists in a finely divided form as a l iquid or solid at 60 degrees F and one atmosphere pressure.

C

. 2 8 PAVED ROADS: An improved street, highway, alley, public way, that is covered by concrete, asphaltic concrete, or asphalt.

C

. 2 9 PERSON: Any individual, public or private corporation, partne rship, association, firm, trust, estate, municipality, or any other legal entity whatsoever which is recognized by law as the subject of rights and duties, who is responsible for an Active Operation.

C

. 30 PM

- 10: Particulate Matter with an aerodynamic di ameter smaller than or equal to a nominal 10 microns as measured by the applicable State and Federal reference

test methods.

C.31 RE

CREATIONAL USE: T he use of motorized vehicles on public lands

.

C.32 R URAL : Areas not

classified as urban constitute “ rural.”

C

. 3 3 SILT: Any A

ggregate M aterial with a particle size less than 75 micrometers in diameter as measured by a No. 200 sieve as defined in ASTM D

- 2487 and as tested by ASTM

- C

- 136 or other equivalent test methods approved by EPA, ARB,

and the APCD.

C. 3 4 STABILIZED SURFACE: Any disturbed surface area or open bulk storage pile

that is resistant to wind blown F ugitive D ust emissions. A surface is considered to be stabilized if it meets at least one of the following conditions specified in this

Sect ion and as determined by the test methods specified in Appendix B , Section
A, B and D

- G tests of this rule:

C. 3 4 .a A visible crust; or

C.34 .b A threshold friction velocity (TFV) for disturbed surface areas corrected

for non

- erodible elements of 100 c entimeters per second or greater; orImperial County Air Pollution Control District Rule 800

800

- 6 C. 34 .c A flat vegetative cover of at least 50 percent that is attached or rooted vegetation; or unattached vegetative debris lying on the surface with a predominant horizontal orientation that is not subject to movem ent by wind; or

C.34 .d A standing vegetative cover of at least 30 percent that is attached or rooted vegetation with a predominant vertical orientation; or

C.34 .e A standing vegetative cover that is attached or rooted vegetative with a predominant ve rtical orientation that is at least 10 percent and where the TFV is at least 43 centimeters per second when corrected for non

- erodible elements; or

C.34 .f A surface that is greater tha n or equal to 10 percent of non

- erodible
elements such as rocks, ston es, or hard

- packed clumps of soil.

C. 3 5 S TABILIZED UNPAVED ROAD : A ny U npaved R oad or unpaved

vehicle/ e quipment traffic area

surface which meets the definition of Stabilized

S urface a s determined by the test method in Appendix B, Section C of this rule,

a nd where VDE is limited to 20% opacity.

C.3 6 TACTICAL TRAINING: Training conducted by the U.S. Department of Defense, the U.S. military services, or its allies for combat, combat support, combat service support, tactical or relief operations. Examples in clude but are not limited to munitions training.

C.3 7 TEMPORARY UNPAVE D ROAD: A ny U npaved R

oad surface which is created to support a temporary or periodic activity and the use of such road surface is limited to vehicle access for a period of not more than six months during any

consecutive three

- year period.

C. 3 8 THRESHOLD FRICTION VELOCITY (TFV): The corrected velocity necessary to initiate soil erosion as determined by the test method specified in A ppendix B,

Section D , of t his rule. The lower TFV, the greater the propensity for fine particles to be lifted at relatively low wind speeds.

C

. 3 9 TRACK

- OUT/CARRY

- OUT: Any and all Bulk Materials that adhere to and

a gglomerate on the exterior surfaces of motor vehicles and/or equipment (including tires) that m

ay then fall onto the pavement.

C

. 40 TRACK

- OUT PREVENTION DEVICE: A G ravel pad, grizzly, wheel wash system, or a paved area, located at the point of intersection of an u npaved area

and a P aved R

oad that prevents or controls T rack

- O ut

.

C

. 41 UNPAVED RO ADS: Streets, alley ways, or roadways that are not covered by one of the following: concrete, asphaltic concrete, asphalt, or other similar materialsImperial County Air Pollution Control District Rule 800

800

- 7 specified by the U.S.EPA, CARB and/or the APCO.

C. 4 2 UNPAVED TRAFFIC AREA: Any nonresidential area th at is:

C. 4 2 .a Not covered by asphalt, recycled asphalt, asphaltic concrete, concrete, or concrete pavement, and

C.42 .b Used for fueling and servicing; shipping, receiving and transfer; or parking or storing equipment, haul trucks, vehicles, and any c onveyances.

C.43 URBAN AREA: An area within an incorporated city boundary or within unincorporated areas completely surrounded by an incorporated city.

C. 4 4 VDE: Visible dust emissions. Dust emissions that are visible to an observer.

C

. 4 5 VMT: Vehic le miles traveled.

C. 4 6 WIND GUST: Is the maximum instantaneous wind speed as measured by an

anemometer.

D. Compliance Schedule

D.1 Existing sources subject to this Regulation shall comply with its requirements no later than 90 days after its adoption date.

D.2 New sources subject to this Regulation shall comply with its requirements prior to initiation of activity.

D.3 The BLM and BP shall each comply with the following compliance schedule:

D.3.a Submit a draft dust control plan addressing all appl icable portions of this Regulation

including section F.5 within three (3) months of the adoption date of this rule, to which the APCO shall respond within 60 days;

D.3.b Submit a final dust control plan addressing all APCO comments within
two (2) months after receiving APCO’s comments, which the APCO shall

transmit to CARB and U.S. EPA for 45

- day review and comment;

D.3.c Implement all final dust control plan elements within six (6) months of

submittal ; and

D.3.d Submit an updated dust control plan e very two calendar years by the procedures described in D.3.a to D.3.c. The updated plans shall be transmitted to the District no later than 90 days after the end of the calendar year and, in addition to information required of the initial plan,Imperial County Air Pollution Control District Rule 800

800

- 8 shall incl ude a summary of actions taken to prevent or mitigate PM10 emissions during the previous two years.

E. Exemptions

The following activities are exempt from provisions of this Regulation:

E.1 Actions required by the Federal or State Endangered Species Ac t or any order issued by a court or governmental agency.

E.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.

E. 3 E mergency maintenance of f lood control channels and water spreading basins.

E

. 4 Any emergency operation activities performed to ensure public health and safety. Emergency activities lasting more than 30 days shall be subject to this R egulation, except wh

ere compliance would limit the effectiveness of the emergency activity performed to ensure public health and safety.

E

. 5 Blasting operations permitted by the California Division of Industrial Safety. Other activities performed in conjunction with blasti ng are not exempt from complying with the provisions of this rule

.

E. 6 The Recreational U se of public lands covered by the most recent BLM d ust

c ontrol p lan

that complies with Rule 800 , including but not limited to Off

- Road
Vehicles, all

- terrain vehicles , trucks, cars, motorcycles, motorbikes or motorbuggies.

E.7 The following m ilitary training activities conducted by the Department of

Defense : (1) m

ilitary T actical T

raining , (2) maintenance, repair, and removal of targets and munitions associated with m ilitary T actical T raining , (3) open areas on active military ranges, including but not limited to designated impact areas, landing zones, and bivouac areas. Other activities performed in conjunction with

m ilitary T actical T raining are not exempt from comp lying with the provisions of

this rule.

F. General Requirements

F.1 Materials used for Chemical S tabilization of soils, including petroleum resins, asphaltic emulsions, acrylics, and adhesives shall not violate State Water Quality

Control Board standards fo r use as a soil stabilizer. Materials accepted by the California Air Resources Board (ARB) and the United States Environmental Protection Agency (EPA), and which meet State water quality standards, shall be considered acceptable to the ICAPCD.Imperial County Air Pollution Control District Rule 800

800

- 9 F.2 Any ma terial prohibited for use as dust S uppressant by EPA, the ARB, or other applicable law, rule, or regulation is also prohibited under Regulation VIII.

F.3 Use of hygroscopic materials may be prohibited by the APCD in areas lacking sufficient atmospheric mo isture of soil for such materials to effectively reduce

F ugitive D ust emissions. The atmospheric moisture of soil is considered to be sufficient if it meets the application specifications of the hygroscopic product manufacturer. Use of such materials may be approved in conjunction with

sufficient wetting of the controlled area.

F.4 Any use of dust S uppressants or gravel pads, and paving materials such as asphalt or concrete for paving, shall comply with other applicable District Rules.

F.5 Bureau of Lan

d Management (BLM) Requirements

The BLM shall prepare a d ust c ontrol p lan to minimize PM10 emissions for

sources under the control of BLM. The d ust c ontrol p lan shall include at a minimum the following:

F.5.a A stipulation that all new authorizations for point and area stationary emission sources obtain all necessary permits and satisfy all applicable SIP provisions, including Regulation VIII specific control measures ;

F.5.b A summary of : the total miles of BLM roads that are paved, paved with unpaved sh

oulders, and unpaved roads with 50 or more average vehicle trips per day, including length and level of usage of each such road; the priority for control of road segments based on annual and episodic (e.g. event) usage; the plans for control of PM

- 10 emiss ions from these roads; the location and extent (e.g. acreage) of open areas disturbed by legal and illegal R ecreational U se; the priorit y for control of these open areas based on annual and episodic (e.g. event) usage; the plans for control of PM

- 10

emissi ons from these areas;

F.5.c BLM must demonstrate in its d ust c ontrol p lan that U npaved Roads, parking, and O

pen A reas are controlled pursuant to the applicability and requirements of Rules 804 and 805 except where measures are demonstrated by BLM to be pr ohibited by federal or state laws, regulations, or approved plans concerning wilderness preservation and species management and recovery.

F.5. d Where compliance with any control measure in Rules 804 and 805 is prohibited pursuant to F.5. c , the d ust c ontr ol p lan must discuss and commit to implement other possible control measures , such as vehicle speed limits

.Imperial County Air Pollution Control District Rule 800

800

- 10 F.5. e The d ust c ontrol p lan must describe all PM

- 10 control measures that will be implemented, such as restricted use areas, stabilization of U npav ed

T raffic A reas and current Recreation Area Management Plan ( RAMP ) measures, to reduce PM10 emissions during off

- road events and/or competitions on public land and include all those measures that are feasible and not prohibited by the laws, regulations an d plans described in

F.5. c ;

F.5. f Use BLM

- standard road design and drainage specifications when maintaining existing roads or authorizing road maintenance and new road
construction; and

F.5.g Include public educational information on reducing PM

- 10 emiss ions with BLM open area literature (e.g. identification of restricted areas and/or applicable speed limits) and on related information signs in heavily used

areas.

F.6. Border Patrol (BP) Requirements

The BP shall prepare a d ust c ontrol p lan designed to minimize PM10 emissions from sources under the control of the BP. The dust control plan shall include

those dust control measures found in Rules 804 and 805. The d ust c ontrol p lan shall include the following fugitive dust control measures:

F.6.a A stipu

lation that all new authorizations for point and area stationary emission sources obtain all necessary permits and satisfy all applicable SIP provisions, including Regulation VIII specific control measures ;

F.6.b Implement alternatives to tire

- dragging th at result in fewer PM10 emissions, unless BP demonstrates such alternatives to be inconsistent with the monitoring of immigration across the U.S.

- Mexico border; and

F.6.c Control dust emissions from certain U npaved R oads and routes owned or operated by th

e BP as identified through general BP planning consistent

with Rule 805 unless those dust control measures are demonstrated to be inconsistent with BP authority and/or mission.

G. Administrative Requirements

G.1 Test Methods

G.1. a Determination of VDE Opacity

Opacity observations to determine compliance with VDE standards shall be conducted in accordance with the test procedures for “Visual Determination of Opacity” as described in Appendix A of this rule.Imperial County Air Pollution Control District Rule 800

800

- 11 Opacity observations for sources other than u npaved traffic areas (e.g., roads, parking areas) shall be conducted per Section B of Appendix A and shall require 12 readings at 15

- second intervals.

G.1. b Determination of Stabilized Surface

Observations to determine compliance with the conditions spec ified for a stabilized surface, in any inactive disturbed surface area, whether at a work site that is under construction, at a work site that is temporarily or permanently inactive, or on an open area and vacant lot, shall be

conducted in accordance with the test methods described in Appendix B of

this rule. If a disturbed surface area passes any of the applicable Appendix

B

- Section A, B and D

- G tests , then the surface shall be considered

stabilized.

G.1. c Determination of Soil Moisture Content

Soil moi sture content shall be determined by using ASTM Method D2216

- 98 (Standard Test Method for Laboratory Determination of Water [Moisture] Content of Soil and Rock by Mass), or other equivalent test methods approved by the EPA, ARB, and the APCO.

G.1. d Determ

ination of Silt Content for Bulk Materials

Silt content of a Bulk M aterial shall be determined by ASTM Method C136a (Standard Test Method for Sieve Analysis of Fine and Coarse Aggregates), or other equivalent test methods approved by EPA, ARB,

and the APC D.

G.1. e Determination of Silt Content for Unpaved Roads and Unpaved Vehicle/Equipment Traffic Areas

Silt Content for U npaved R oads and U npaved

Traffic A

reas shall be determined by using Section C of Appendix B of this Rule or other equivalent test meth

ods approved by EPA, ARB, and the APCO.

G.1. f Determination of Threshold Friction Velocity (TFV)

TFV shall be determined by using Section D of Appendix B of this Rule or other equivalent test methods approved by EPA, ARB, and the APCO.

H

. Record of Con trol Implementation

Any P erson subject to the requirements of this rule shall compile and retain records that provide evidence of control measure application and compliance with this rule (i.e., receipts and/or purchase records). Such P erson shall descri be, in the records, the type ofImperial County Air Pollution Control District Rule 800

800

- 12 treatment or control measure, extent of coverage, and date applied. For control measures which require multiple daily applications

, recording the frequency of application will fulfill the recordkeeping requirements of this r ule (i.e., water being applied three times a day and the date ) Records shall be maintained and be readily accessible for two years after the date of each entry and shall be provided to the APCD upon request.

I

. Violations

Failure to comply with any provi sions of this rule shall constitute a violation of Regulation VIII

. Failure to comply with the provisions of an APCO approved d ust

c ontrol p lan shall also constitute a violation of this Regulation. Regardle ss of whether an APCO approved du st c ontrol p lan is being i mplemented or not, or whether a Person responsible for an Active Operation(s) is complying with an approved d ust c ontrol p lan, the Person is still subject to the requirements of Regulation VIII at all times.Imperial County Air Pollution Control District Rule 800

800

- 13 APPENDIX A

Visual Determination of O pacity

SECTION A Test Method For Unpaved Roads and Unpaved Traffic Areas

SECTION B Test Method For Time

- Averaged Regulations

SECTION A TEST METHOD FOR UNPAVED ROADS AND UNPAVED TRAFFIC

AREAS

A. Opacity Test Method. The purpose of this test method is to estimate the percent opacity of Fugitive D ust plumes caused by vehicle movement on U npaved R oads and U npaved

T raffic A reas. This method can only be conducted by an individual who has current certification as a qualified observer.

A.1 Step 1: Stand at le ast 16.5 feet from the fugitive dust source in order to provide a

clear view of the emissions with the sun oriented in the 140° sector to the back. Following the above requirements, make opacity observations so that the line of vision is approximately per pendicular to the dust plume and wind direction. If multiple plumes are involved, do not include more than one plume in the line of sight at one time.

A.2 Step 2: Record the Fu gitive D ust source location, source type, method of control used, if any, obse rver’s name, certification data and affiliation, and a sketch of the

obser ver’s position relative to the F ugitive D ust source. Also, record the t ime,

estimated distance to the F ugitive D ust source location, approximate wind direction, estimated wind speed , description of the sky condition (presence and color of

cloud s), observer’s position to the F ugitive D ust source, and color of the plume and type of background on the visible emission observation form both when opacity readings are initiated and complete d.

A.3 Step 3: Make opacity observations, to the extent possible, using a contrasting background that is perpendicular to the line of vision. Make opacity observations approximately 1 meter above the surface from which the plume is generated. Note

that the observation is to be made at only one visual point upon generation of a plume, as opposed to visually tracking the entire length of a dust plume as it is created along a surface. Make two observations per vehicle, beginning with the first reading at z

ero seconds and the second reading at five seconds. The zero

second observation should begin immediately after a plume has been created above the surface involved. Do not look continuously at the plume but, instead, observe the plume briefly at zero seco nds and then again at five seconds.

A.4 Step 4: Record the opacity observations to the nearest 5% on an observational record sheet. Each momentary observation recorded represents the average opacity

of emissions for a 5

- second period. While it is not req uired by the test method, EPA recommends that the observer estimate the size of the vehicles which generate dust plumes for which readings are taken (e.g. mid

- size passenger car or heavy

- dutyImperial County Air Pollution Control District Rule 800

800

- 14 truck.) and take the approximate speeds the vehicles are traveli ng when the readings are being taken.

A.5 Step 5: Repeat Step 3 (Section A.3. of this appendix) and Step 4 (Section A.4. of this appendix) until you have recorded a total of 12 consecutive opacity readings.

This will occur once six vehicles have driven o n the source in your line of observation for which you are able to take proper readings. The 12 consecutive readings must be taken within the same period of observation but must not exceed 1 hour. Observations immediately preceding and following interrup ted observations

can be considered consecutive.

A.6 Step 6: Average the 12 opacity readings together. If the average opacity reading equals 20% or lower, the source is in compliance with the opacity standard described in the applicable rule.

SECTION B T EST METHOD FOR VISUAL DETERMINATION OF OPACITY OF

EMISSIONS FROM SOURCES FOR TIME

- AVERAGED REGULATIONS

B. Applicability. This method is applicable for the determination of the opacity of emissions

from sources of visible emissions for time

- averaged regul ations. A time

- averaged regulation is any regulation that requires averaging visible emission data to determine the opacity of visible emissions over a specific time period.

B.1 Principle. The opacity of emissions from sources of visible emissions is de termined visually by a qualified observer who has received certification.

B.2 Procedures. A qualified observer who has been certified shall use the following procedures for visually determining the opacity of emissions.

B.2.a Position. Stand at a posit ion at least 5 meters from the F ugitive D ust source n order to provide a clear view of the emissions with the sun oriented in the 140° sector to the back. Consistent as much as possible with maintaining the above requirements, make opacity observations fr om a position such that the line of sight is approximately perpendicular to the plume and wind direction . The observer may follow the F ugitive D ust plume generated by mobile earthmoving equipment, as long as the sun

remains oriented in the 140° sector to the back. As much as possible, if multiple plumes are involved, do not include more than one plume in the line of sight at one time.

B.2.b Field Records. Record the name of the site, F ugitive D ust source type (i.e., pile, material handling (i.e., transf er, loading, sorting)), method of control used, if any, observer’s name, certification data and affiliation,

and a sketch of the obser ver’s position relative to the F ugitive D ust source. Also, record the t ime, estimated distance to the F ugitive D ust sourc e location, approximate wind direction, estimated wind speed, description ofImperial County Air Pollution Control District Rule 800

800

- 15 the sky condition (presence and color of clouds,) observer’s position relative to the fugitive dust source, and color of the plume and type of the background on the visible emissi on observation form when opacity readings are initiated and completed.

B.2.c Observations. Make opacity observations, to the extent possible, using a contrasting background that is perpendicular to the line of sight. For storage piles, make opacity obse rvations approximately 1 meter above the surface from which the plume is generated. For extraction operations and the loading of haul trucks in open

- pit mines, make opacity observations approximately one meter above the rim of the pit. The initial observ ation should begin immediately after a plume has been created above the surface involved. Do not look continuously at the plume, but instead observe the plume momentaril y at 15

- second intervals. For F ugitive D ust

from E arth

m oving equipment, make opacity observations approximately 1 meter above the mechanical equipment generating the plume.

B.2.d Recording Observations. Record the opacity observations to the nearest 5% every 15 seconds on an observational record sheet. Each momentary

observation recorde d represents the average opacity of emissions for a 15

- second period. If a multiple plume exists at the time of an observation, do not record an opacity reading. Mark an “x” for that reading. If the equipment generating the plume travels outside of the field of observation, resulting in the inability to maintain the orientation of the sun within the 140° sector or if the equipment ceases operating, mark an “x” for the 15

– second interval reading. Readings identified as “x” shall be considered interrupt ed readings.

B.2.e Data Reduction For Time

- Averaged Regulations. For each set of 12 or 24 consecutive readings, calculate the appropriate average opacity. Sets must consist of consecutive observations, however, readings immediately preceding and followi

ng interrupted readings shall be deemed consecutive and in no case shall two sets overlap, resulting in multiple violations.Imperial County Air Pollution Control District Rule 800

800

- 16 APPENDIX B

Determination of Stabilization

SECTION A Test Methods for Determining Stabilization

SECTION B Visible Crust Determina tion

SECTION C Determination of Silt Content for Unpaved Roads and Unpaved

Vehicle/Equipment Traffic Areas

SECTION D Determination of Threshold Friction Velocity

SECTION E Determination of Flat Vegetative Cover

SECTION F Determination of Standing Vegetativ e Cover

SECTION G Rock Test Method

SECTION A TEST METHODS FOR DETERMINING STABLIZATION

The test methods described in Section B through Section G of this appendix shall be used

to d etermine whether an area has a S tabilized S urface. Should a disturbed a rea contain more than one type of disturbance, soil, vegetation, or other characteristics, which are visibly distinguishable, test each representative surface separately for stability, in an area that represents a random portion of the overall disturbed co nditions of the site, according to the appropriate test methods in Section B through Section G of this appendix, and
include or eliminate it from the total size assessment of disturbed surface area(s) depending upon test method results.

SECTION B VISIBLE CRUST DETERMINATION

B.1 Where a visible crust exists, drop a steel ball with a diameter of 15.9 millimeters (0.625 inches) and a mass ranging from 16

- 17 grams from a distance of 30 centimeters (one foot) directly above (at a 90° angle perpendicular to ) t he soil surface. If blowsand is present, clear the blowsand from the surfaces on which the visible crust test method is conducted. Blowsand is defined as thin deposits of loose uncombined grains covering less than 50% of a site which have not originated from the representative site surface being tested. If material covers a visible crust, which is not blowsand, apply the test method in Section D of this appendix to the loose material to determine whether the

surface is stabilized.

B.2 A sufficient crust

is defined under the following conditions: once a ball has been dropped according to section B.1 of this appendix, the ball does not sink into the surface, so that it is partially or fully surrounded by loose grains and, upon removing the ball, the surfac e upon which it fell has not been pulverized, so that loose grains are visible.

B.3 Drop the ball three times within a survey area that measures 1 foot by 1 foot and that represents a random portion of the overall disturbed conditions of the site. The su rvey area shall be considered to have passed the Visible Crust Determination Test if the results of at least two out of the three times that the ball was dropped, met the criteria in section B.2 of this appendix. Select at least two other survey areas tha t represent a randomImperial County Air Pollution Control District Rule 800

800

- 17 portion of the overall disturbed conditions of the site, and repeat this procedure. If the results meet the criteria of section B.2 of this appendix for all of the survey areas tested, then the site shall be considered to have passed the Visible Crust Determination Test and shall be considered sufficiently crusted.

B.4 At any given site, the existence of a sufficient crust covering one portion of the site may not represent the existence or protectiveness of a crust on another portion of the site. Repeat the visible crust test as often as necessary on each random portion of the overall

conditions of the site for an accurate assessment.

SECTION C DETERMINATION OF SILT CONTENT FOR UNPAVED ROADS AND

UNPAVED VEHICLE/EQUIPMENT TRAFFIC AREA S

The purpose of this test method is to estimate the silt cont ent of the trafficked parts of Unpaved R

oads and U npaved vehicle/equipment T raffic A reas. The higher the S ilt content, the more fine dust particles that are re leased when vehicles travel on U npaved

R oads and U npaved vehicle/equipment T raffic A reas.

C.1 Equipment:

C.1.a. A set of sieves with the following openings: 4 millimeters (mm), 2mm, 1mm, 0.5mm and 0.25 mm, a lid, and collector pan.

C.1.b A small whisk broom or paintbrush with stiff bri stles and dustpan 1 ft. in width (the broom/brush should preferably have one, thin row of bristles no longer than 1.5 inches in length.)

C.1.c A spatula without holes.

C.1.d A small scale with half

- ounce increments (e.g., postal/package scale.)

C.1.e A sha llow, lightweight container (e.g., plastic storage container.)

C.1.f A sturdy cardboard box or other rigid object with a level surface. C.1.g A basic calculator.

C.1.h Cloth gloves (optional for handling metal sieves on hot, sunny days.)

C.1.i Sealable pla stic bags (if sending samples to a laboratory.) C.1.j A pencil/pen and paper.

C.2 Step 1: Look for a routinely traveled surface, as evidenced by tire tracks. Only collect samples from surfaces that are not damp due to precipitation or dew. This statement is not meant to be a standard in itself for dampness where watering is being used as a control measure. It is only intended to ensure that surface testing is done in a representative manner. Use caution when taking samples to ensure personal safety with respect to passing vehicles. Gently press the edge of a dustpan (1 foot in width) into the surface four times to mark an area that is 1 square foot. Collect a sample of loose surface material into the dustpan, minimizing escape of dust particles. Use a spatula to lift heavier elements such as gravel. Only collect dirt/ G ravel to an approximate depth of 3/8 inch or 1 cm in the 1 square foot area. If you reach a hard, underlying subsurface that is <3/8 inch in depth, do not continue collecting the sample by digging into the hard surface. In other words, you are only collecting a surface sample of loose material downImperial County Air Pollution Control District Rule 800

800

- 18 to 1 cm. In order to confirm that samples are collected to a 1cm depth, a wooden dowel or other similar narrow object at least one

- foot in length can be laid horizontally across the survey area while a metric ruler is held perpendicular to the dowel. (Optional: At this point, you can choose to place the sample collected into a plastic bag or container and take it to an independent laboratory for silt content analysis. A reference to the procedure the laboratory is required to follow is at the end of this section.)

C.3 Step 2: Place a scale on a level surface. Place a lightweight container on the scale. Zero the scale with the weight of th e empty container on it. Transfer the entire sample collected in the dustpan to the container, minimizing escape of dust particles. Weigh the sample and record its weight.

C.4 Step 3: Stack a set of sieves in order according to the size openings specifi ed above, beginning with the largest size opening (4mm) at the top. Place a collector pan
underneath the bottom (0.25mm) sieve.

C.5 Step 4: Carefully pour the sample into the sieve stack, minimizing escape of dust particles by slowly brushing material in to the stack with a whiskbroom or brush. On windy days, use the trunk or door of a vehicle as a wind barrier. Cover the stack with a lid. Lift up the sieve stack and shake it vigorously up and down and sideways for at least

1 minute.

C.6 Step 5: Remove the lid from the stack and disassemble each sieve separately, beginning with the top sieve. As you remove each sieve, examine it to make sure that all of the material has been sifted to the finest sieve through which it can pass (e.g., material in

each s ieve (besides the top sieve that captures a range of larger elements) should look the same size.) If this is not the case, re

- stack the sieves and collector pan, cover the stack with the lid, and shake it again for at least 1 minute. You only need to rea ssemble the sieve(s) that contain material, which require further sifting.

C.7 Step 6: After disassembling the sieves and collector pan, slowly sweep the material from the collector pan into the empty container originally used to collect and weigh the ent ire sample. Take care not to minimize escape of dust particles. You do not need to do anything with material captured in the sieves

–only the collector pan. Weigh the container with the materials from the collector pan and record its weight.

C.8 Step 7: If the source is an unpaved road, multiply the resulting weight by 0.38. If the

source is an U

npaved vehicle/equipment T raffic A rea, multiply the resulting weight by

0.55. The res ulting number is the estimated s ilt loading. Then, divide the total wei ght of the sample you recorded earlier in Step 2 (Section C.4) and multiply by 100 to estimate the percent S ilt content.

C.9 Step 8: Select another two rout inely traveled portions of the U npaved R oad or U npaved vehicle/equipment T

raffic A rea and repeat th

is test method. Once you have calculated the silt loading and percent silt content of the 3 samples collected, average your results together.Imperial County Air Pollution Control District Rule 800

800

- 19 C.10 Step 9: Examine Results. If the average silt loading is less than 0.33 oz/ft 2 , the surface is

STABLE. If the average silt loading is greater than or equal to 0.33 oz/ft 2 , then proceed to examine the average percent S ilt content. If the source is an U npaved R oad and the

average percent S ilt content is 6% or less, the surface is STABLE. If the source is an

un paved parking lot and the average percent S ilt content is 8% or less, the surface is STABLE. If your field test results are within 2% of th e standard (for example, 4%

- 8%

S ilt content on an U npaved R oad) it is recommended that you collect 3 additional

samp les from the source according to Step 1 (section C. 2 ) and take them to an independent laboratory for S ilt content analysis.

C.11 Independent Laboratory Analysis: You may choose to collect samples from the source, according to Step 1 (section C. 2 ) and sen d them to an independe nt laboratory for S ilt content analysis rather than conduct the sieve field procedure. If so, the test method the laboratory is required to use is: “Procedures For Laboratory Analysis for Surface/Bulk Dust Loading Samples,” (Fifth Ed ition, Volume 1, Appendix C.2.3 “Silt Analysis,” 1995,) AP

- 42, Office of Air Quality Planning & Standards, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina.

SECTION D DETERMINATION OF THRESHOLD FRICTION VELOCITY (TFV)

For dis turbed surface areas that are not crusted or vegetated, determine threshold friction velocity (TFV) according to the following sieving field procedure (based on a 1952 laboratory procedure published by W.S. Chepil).

D.1 Obtain and stack a set of sieves wi th the following openings: 4 millimeters (mm), 2 mm, 1 mm, 0.5 mm, and 0.25 mm or obtain and stack a set of standard/commonly available sieves. Place the sieves in order according to size openings, beginning with the largest size opening at the top. Plac e a collector pan underneath the bottom (0.25 mm) sieve. Collect a sample of loose surface material from an area at least 30 cm by 30 cm in size to a depth of approximately 1 cm using a brush and dustpan or other similar device. Only collect soil samples

from dry surfaces (i.e. when the surface is not damp to the touch). Remove any rocks larger than 1 cm in diameter from the sample. Pour the sample into the top sieve (4 mm opening) and cover the sieve/collector pan unit with a lid. Minimize escape of p articles into the air when transferring surface soil into the sieve/collector pan unit. Move the covered sieve/collector pan unit by hand using a broad, circular arm motion in the horizontal plane. Complete twenty circular arm movements, ten clockwise

an d ten counterclockwise, at a speed just necessary to achieve some relative horizontal motion between the sieves and the particles. Remove the lid from the sieve/collector pan unit and disassemble each sieve separately beginning with the largest sieve. As each sieve is removed, examine it for loose particles. If loose particles have not been sifted to the finest sieve through which they can pass, reassemble and cover the sieve/collector pan unit and gently rotate it an additional ten times. After disasse mbling the sieve/collector pan unit, slightly tilt and gently tap each sieve and the collector pan so that material aligns along one side. In doing so, minimize escape of particles into the air. Line up the sieves and collector pan in a row and visibly i nspect the relative quantities of catch inImperial County Air Pollution Control District Rule 800

800

- 20 order to determine which sieve (or whether the collector pan) contains the greatest volume of material. If a visual determination of relative volumes of catch among sieves is difficult, use a graduated cylinder t o measure the volume. Estimate TFV for the sieve catch with the greatest volume using Table 1 of this appendix, which provides a correlation between sieve opening size and TFV.

Table 1. Determination of Threshold Friction Velocity (TFV)

Tyler Sieve No. ASTM 11

Sieve No. Opening

(mm) TFV

(cm/s)

5 5 4 135

9 10 2 100

16 18 1 76

32 35 0.5 58

60 60 0.25 43

Collector Pan

--- --- 30

D.2 Collect at least three soil samples which represent random portions of the overall conditions of the site, repeat the above TFV test method for each sample and average the resulting TFVs together to determine the TFV uncorrected for non erodible elements.

Non

- erodible elements are distinct elements, in the random portion of the overall conditions of the site, that are la rger than 1 cm in diameter, remain firmly in place during a wind episode, and inhibit soil loss by consuming Section of the shear stress of the wind.

Non

- erodible elements include stones and bulk surface material but do not include flat or standing vegeta tion. For surfaces with non

- erodible elements, determine corrections to the TFV by identifying the fraction of the survey area, as viewed from directly overhead, that is occupied by non

- erodible elements using the following procedure. Select a survey

are a of 1 meter by 1 meter that represents a random portion of the overall conditions of the site. Where many non

- erodible elements lie within the survey area, separate the non

erodible elements into groups according to size. For each group, calculate the o verhead

area for the non

- erodible elements according to the following equations:

Average Dimensions = (Average Length) x ( Average Width) Eq. 1

Overhead Area = (Average Dimensions) x (Number of Elements) Eq. 2

Total Overhead Area =

Overhead Area Of G

roup 1 + Overhead Area of Group 2 (etc) Eq. 3Imperial County Air Pollution Control District Rule 800

800

- 21 Total Frontal Area =

Total Overhead Area/2 Eq. 4

Percent Cover of Non

- Erodible Elements = (Total Frontal Area/Survey Area) x 100 Eq. 5

Note: Ensure consistent units of measurements (e.g., square meters or square inches when calculating percent cover).

Repeat this procedure on an additional two distinct survey areas that represent a random portion of the overall conditions of the site and average the results. Use Table 2 of this appendix to identify th

e correction factor for the percent cover of non

- erodible elements. Multiply the TFV by the corresponding correction factor to calculate the TFV corrected

for non

- erodible elements.

Table 2. Correction Factors for Threshold Friction Velocity

Percent Co ver of Non

- Erodible Elements Correction Factor Greater than or equal to 10% 5 Greater than or equal to 5% and less than 10% 3 Less than 5% and greater than or equal to 1% 2

Less than 1% None

SECTION E DETERMINATION OF FLAT VEGETATIVE COVER

Flat vege tation includes attached (rooted) vegetation or unattached vegetative debris lying on the surface with a predominant horizontal orientation that is not subject to movement by wind. Flat vegetation, which is dead but firmly attached, shall be considered eq ually protective as live vegetation. Stones or other aggregate larger than 1 centimeter in diameter shall be considered protective cover in the course of conduction the line transect test method. Where flat vegetation exists conduct the following line

tr ansect test method.

E.1 Line Transect Test Method. Stretch a 100 foot measuring tape across a survey area that represents a random portion of the overall conditions of the site. Firmly anchor both ends of the measuring tape into the surface using a tool such as a screwdriver, with the tape stretched taut and close to the soil surface. If vegetation exists in regular rows, place the tape diagonally (at approximately a 45° angle) away from a parallel or perpendicular position to the vegetated rows. Pinpo int an area the size of a 3/32 inch diameter brazing rod or wooden dowel centered above each 1 foot interval mark along one edge of the tape. Count the number of times that flat vegetation lies directly underneath the pinpointed area at 1 foot intervals. Consistently observe the underlying surface from a 90° angle directly above each pinpoint on one side of the tape. Do not count theImperial County Air Pollution Control District Rule 800

800

- 22 underlying surface as vegetated if any portion of the pinpoint extends beyond the edge of the vegetation underneath in any direction. If clumps of vegetation or vegetative debris lie underneath the pinpointed area, count the surface as vegetated, unless bare soil is visible directly below the pinpointed area. When 100 observations have been made, add together the number of times a surface was counted as vegetated. This total represents the percent of flat vegetations cover (e.g., if 35 positive counts were made, then vegetation cover is 35%.) If the survey area that represents a random portion of the

overall conditions of the site is too small for 100 observations, make as many observations as possible. Then multiply the count of vegetated surface areas by the appropriate conversion factor to obtain percent cover. For example, if vegetation was

counted 20 times within a t otal of 50 observations, divide 20 by 50 and multiply by 100 to obtain a flat vegetation cover of 40%.

E.2 Conduct the line transect test method, as described in section E.1 of this appendix, an additional two times on areas that represent a random portio n of the overall conditions of the site and average results.

SECTION F DETERMINATION OF STANDING VEGETATIVE COVER.

Standing vegetation includes vegetation that is attached (rooted) with a predominant vertical orientation. Standing vegetation, which is dead but firmly rooted, shall be considered equally protective as live vegetation. Conduct the following standing vegetation test method to determine if 30% cover or more exists. If the resulting percent cover is less than 30% but equal to or greater tha n 10%, then conduct the test in Section D; “Determination Of Threshold Friction Velocity (TFV,) of this appendix in order to determine if the site is stabilized, such that the standing vegetation cover is equal to or greater than 10%, where threshold frict ion velocity, corrected for non

- erodible elements, is equal to or greater than 43cm/second.

F.1 For standing vegetation that consists of large, separate vegetative structures (e.g., shrubs and sagebrush,) select a survey area that represents a random port ion of the overall conditions of the site that is the shape of a square with sides equal to at least 10 times the average height of the vegetative structures. For smaller standing vegetation, select a survey area of three feet by three feet.

F.2 Count th

e number of standing vegetative structures within the survey area. Count vegetation, which grows in clumps as a single unit. Where different types of vegetation exist and/or vegetation of different height and width exists, separate the vegetative

structu res with similar dimensions into groups. Count the number of vegetative structures in each group within the survey area. Select an individual structure within each group that represents the average height and width of the vegetation in the group. If

the structure is dense (e.g., when looking at it vertically from base to top there is little or zero open air space within its perimeter,) calculate and record its frontal silhouette area, according to Equation 6 of this appendix. Also, use Equation 6 of thi s appendix to estimate the average height and width of the vegetation if the survey area is larger than nine square feet. Otherwise, use the procedure in section F.3 of this appendix to calculateImperial County Air Pollution Control District Rule 800

800

- 23 the frontal silhouette area. Then calculate the percent co ver of standing vegetation according to Equations 7, 8, and 9 of this appendix.

Note: Ensure consistent units of measurement (e.g., square meters or squa re inches when calculating percent cover.)

F.3. Vegetative Density Factor. Cut a single, representative piece of vegetation (or consolidated vegetative structure) to within 1cm of surface soil. Using a white paper grid or transparent grid over white pa per, lay the vegetation flat on top of the grid (but do not apply pressure to flatten the structure.) Grid boxes of 1 inch or 1⁄2 inch squares are sufficient for most vegetation when conducting this procedure. Using a marker or pencil, outline the shape of

the vegetation along its outer perimeter, according to Figure B, C, or D of this appendix, as appropriate. (Note: Figure C differs from Figure D primarily in that the width of vegetation in Figure C is narrow at its base and gradually broadens to its

tal lest height. In Figure D, the width of the vegetation generally becomes narrower from its midpoint to its tallest height.) Remove the vegetation, count and record the total number of gridline intersections within the outlined area, but do not count gri dline Frontal Silhouette Area = (Average Height) x (Average Width) Eq. 6

Frontal Silhouette Area Of Group= (Frontal Silhouette Area Of Individual Vegetative Structure) x
(Number Of

Vegetation Structures Per Group) Eq. 7

Total Frontal Silhouette Area = Frontal Silhouette Area Of Group 1 + Frontal Silhouette Area Of Group 2 (etc.) Eq. 8

Percent Cover Of Standing Vegetation = (Total Frontal Silhouette Area/Survey Area) x 100 Eq. 9

P ercent Open Space = [(Number Of Circled Gridlines Within The Outlined Area Counted That Are Not Covered By Vegetation/Total Number Of Gridline Intersections Within The Outlined Area) x 100] Eq.10

Percent Vegetative Density =

100

–Percent Open Space Eq. 1 1

Vegetative Density = Percent Vegetative Density/100 Eq. 12

Frontal Silhouette Area = [Max. Height x Max. Width] x [Vegetative Density/.04]o.5 Eq. 13Imperial County Air Pollution Control District Rule 800

800

- 24 intersections that connect with the outlined shape. There must be at least 10 gridline intersections within the outlined area and preferably more than 20, otherwise, use smaller grid boxes. Draw small circles (no greater than a 3/32 inch diameter) at each gridline intersection counted within the outlined area. Replace the vegetation on the grid within its outlined shape. From a distance of approximately 2 feet directly above the grid, observe each circled gridline intersection. Count and record t he number of circled gridline intersections that are not covered by any piece of the vegetation. To calculate percent vegetative density, use Equations 10 and 11 of this appendix. If percent vegetative density is equal to or greater than 30, use an equat ion (one of the equations

Equations 16, 17, or 18 of this appendix) that matches the outline used to trace the vegetation (Figure B, C, or D) to calculate its frontal silhouette area. If percent vegetative density is less than 30, use Equations 12 and 13 of this appendix to calculate

the frontal silhouette area.

Figure B. Cylinder

Frontal Silhouette Area = Maximum Height x Maximum Width Eq.16

Figure C. Inverted Cone

Frontal Silhouette Area = Maximum Height x 1⁄2 Maximum Width Eq. 17Imperial County Air Pollution Control District Rule 800

800

- 25 Figure D. Upper Sphere

Frontal Silhouette Area = (3.14 x Maximum Height x 1⁄2 Maximum Width)/2 Eq.18

SECTION G ROCK TEST METHOD

The Rock Test Method, which is similar to Section D, Test Methods For Stabilization

Determination Of Threshold Fr iction Velocity (TFV) of this appendix, examines the

wind

- resistance effects of rocks and other non

- erodible elements on disturbed surfaces.

Non

- erodible elements are objects larger than 1 centimeter (cm) in diameter that remain firmly in place even on wi ndy days. T

y pically, non

- erodible elements include rocks, stones, glass fragments, and hardpacked clumps of soil lying on or embedded in the surface. Vegetation does not count as a non

- erodible element in this method. The purpose of this test method is to estimate the percent cover of non

- erodible elements on a given surface to see whether such elements take up enough space to offer protection against windblown dust. For simplification, the following test method refers to all non

erodible elements as ‘r ocks.”

G.1 Select a 1 meter by 1 meter survey area that represents the general rock distribution on the surface. A 1 meter by 1 meter area is slightly greater than a 3 foot by 3 foot area.

Mark

- off the survey area by tracing a straight, visible line in the dirt along the edge of a measuring tape or by placing short ropes, yard sticks, or other straight objects in a square around the survey area.

G.2 Without moving any of the rocks or other elements, examine the survey area. Since
rocks >3/8 inch (1cm) in diameter are of interest, measure the diameter of some of the smaller rocks to get a sense of which rocks need to be considered.

G.3 Mentally group the rocks >3/8 inch (1cm) diameter lying in the survey area into small, medium, and large size categori es. Or, if the rocks are all approximately the same size, simply select a rock of average size and typical shape. Without removing any of the rocks from the ground, count the number of rocks in the survey area in each group and write down the resulting n umber.

G.4 Without removing rocks, select one or two average

- size rocks in each group and measure the length and width. Use either metric units or standard units. Using a calculator, multiply the length times the width of the rocks to get the average di mensions of theImperial County Air Pollution Control District Rule 800

800

- 26 rocks in each group. Write down the results for each rock group.

G.5 For each rock group, multiply the average dimensions (length times width) by the number of rocks counted in the group. Add the results from each rock group to get the t otal rock area within the survey area.

G.6 Divide the total rock area, calculated in section G.5 of this appendix, by two (to get frontal area.) Divide the resulting number by the size of the survey area (make sure the units of measurement match,) and mu ltiply by 100 for percent rock cover. For example, the total rock area is 1,400 square centimeters divide 1,400 by 2 to get 700. Divide 700 by 10,000 (the survey area is 1 meter by 1 meter, which is 100 centimeters by 100 centimeters or 10,000 centimeter s) and multiply by 100. The result is 7% rock cover. If rock measurements are made in inches, convert the survey area from meters to inches (1 inch = 2.54 centimeters.)

G.7 Select and mark

- off two additional survey areas and repeat the procedures descri bed in section G.1 through section G.6 of this appendix. Make sure the additional survey areas also represent the general rock distribution on the site. Average the percent cover results from all three survey areas to estimate the average percent of rock cover.

G.8 If the average rock cover is greater than or equal to 10%, the surface is stable. If the average rock cover is less than 10%, follow the procedures in section G.9 of this appendix.

G.9 If the average rock cover is less than 10%, the surface may or may not be stable. Follow the procedures in Section D.3 Determination Of Threshold Friction Velocity (TFV) of this rule and use the results from the rock test method as a correction (i.e., multiplication)
factor. If the rock cover is at least 1%, such rock cover helps to limit windblown dust. However, depending on the soil’s ability to release fine dust particles into the air, the percent rock cover may or may not be sufficient enough to stabilize the surface. It is also possible that the soil it self has a high enough TFV to be stable without even accounting

for rock cover.

G.10 After completing the procedures described in Section G.9 of this appendix, use Table 2 of this appendix to identify the appropriate correction factor to the TFV, dependin g on the percent rock cover.rule in.txt

Subject: Regulation VIII SIP Submittal
Date: Thu, 30 Mar 2006 17:15:15 -0800 From: Monica Soucier <monicasoucier@imperialcounty.net> To: David Brown <dabrown@arb.ca.gov>

Dave,

I tried earlier to e-mail the whole regulation VIII zipped and I got an undeliverable notification. So, I am sending it piecemeal. Here is a copy of the original e-mail.... Expect seven e-mails

Dave,

Good day! Attached please find the zipped file for Regulation VIII broken down into the seven individual rule packages. Rule 800, Rule 801, Rule 802, Rule 803, Rule 804, Rule 805 and Rule 806. Should you have any concerns please let me know. Thank you

Monica N. Soucier APCD Specialist

150 S 9th Street
El Centro, CA 92243 (760) 482-2074 or (760) 482-4606

Name: Rule 800 SIP Submittal.zip Type: Zip Compressed Data Rule 800 SIP Submittal.zip (application/x-zip-compressed) Encoding: base64 Download Status: Not downloaded with message

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