92.1 FuGITIvE DUST From UNPAVED PARKING LOTS

92.1.1

AIR

Purpose:

from

To limit the EMissioN of PARTIcuLATE MA1-rER into the AMBIENT

and vehicle

UNPAVED PARKING LOTS; material handling and storage yards;

and equipment storage yards.

Applicability:

PARKING

The provisions of this Regulation shall apply to UNPAVED

equipment

LOTS; material handling and storage yards; and vehicle and

storage yards which are located in the PM 10 N0N-ATrAINMENT

AREA (HYDR0GRAPHIc BASIN 212), in the Apex Valley (HYDR0GRAPHIc

Regulation.

BASINS 216 and 217), and which are not regulated by Section 94 of this

means any

For the purposes of this Regulation, UNPAVED PARKING LOT

area of 5,000 square feet or larger that is not PAVED and that

or

is used

materials.

for parking, maneuvering, or storing MOTOR VEHIcLEs, equipment,

wrecking

UNPAvED PARKING LOT includes automobile impound yards,

handling

yards, automobile dismantling yards, salvage yards, material

maneuvering

yards, and storage yards. For the purposes of this regulation,

on

shall not include military maneuvers or exercises conducted

Regulations

federal facilities. Nothing in Subsections 92.1 through 92.4 of these

(Prohibition

shall be construed to prevent enforcement of Section 40

of

of NuISANcE Conditions) of these Regulations. The provisions

Section

this Regulation

0,

shall not apply to STATIONARY SOURCES as defined in

of a BACT

except that these control measures shall be considered as part

determination.

92.1.3 Effective Date Of This Regulation:

92.1.3.1

212

Regulations

on their

92.1 through 92.4 shall be effective in HYDROGRAPHIC BASIN

June 22, 2000,

adoption by the District Board of Health of Clark County on

except as otherwise provided herein.

92.1.3.2

216

Regulations

and

92.1 through 92.4 shall be effective in HYDR0GRAPHIc BASINS

217 on April 1, 2002, except as otherwise provided herein.

92.2 Requirements:

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I

Ifr3/i3

SECTION 92-

MATERAIL

FUGITIVE DUST FROM UNPAVED PARKING LOTS;

HANDLING AND STORAGE YARDS; AND

VEHICLE AND EQUIPMENT STORAGE YARDS

92.1.2
L3/t3

92.2.1 UNPAVED PARKING LOTS, including Material Handling and Storage

Yards and Equipment and Vehicle Storage Yards: The OWNER

AND/OR OPERAToR of an existing UNPAVED PARKING LOT in HYDR0GRAPHIc

BASIN 212 shall implement one of the CONTROL MEAsuREs described in

Subsection 92.2.1.2 of this Regulation by July 1, 2001. The OWNER

AND/OR OPERATOR of an existing UNPAVED PARKING LOT in HYDR0GRAPHIC

BASINS 216 andlor 217 shall implement one of the CoNTRoL MEAsuREs

described in Subsection 92.2.1.2 of this Regulation by April 1, 2003. For

UNPAVED PARKING LOTS that are utilized intermittently, for a period of 35

days or less during the calendar year, the OWNER AND/OR OPERATOR shall

implement one of the CONTROL MEAsuREs described in Subsection

92.2.1.2 during the period that the UNPAVED PARKING LOT is utilized for

vehicle parking. For the purpose of this Regulation, the CONTROL

MEASUREs set forth in Subsection 92.2.1.2 shall be considered effectively

implemented when the UNPAvED PARKING LOT meets the stabilization

requirements described in Subsection 92.2.1.3 of this Regulation.

92.2.1.1 No UNPAVED PARKING LOTS may be constructed in HYDR0GRAPHIc BASIN

212 or in HYDROGRAPHIc BASINS 216 and 217 after adoption of this

Subsection except as provided in Subsection 92.1.1.1 (a), (b), or (c)

below:

(a) The requirements of Subsection 92.2.1.1 shall not be applicable to

parking lots for rural public facilities such as trailheads, campgrounds,

and similar facilities where paved parking lots would conflict with the

rural nature of these facilities provided such UNPAVED PARKING LOT is

stabilized in accordance with Subsection 92.2.1.2(b) through (d) prior

to being used. For the purposes of this Subsection, a rural public

facility shall not include any facility located within the BLM Disposal

Boundary.

(b) If the UNPAVED PARKING LOT is used for storing and handling of

landscaping, aggregate, and other similar bulk materials, the

OwNER/OPERAToR shall implement one of the CONTROL MEAsuREs

described in Subsection 92.2.1.2 of this Regulation subject to the

approval of the CoNTRoL OFFICER, provided however, all access,

parking and loading areas used by on-road vehicles shall be paved.

(c) If the UNPAVED PARKING LOT is used primarily for storage of non-rubber

tired vehicles or equipment, the OwNER/OPERAToR shall implement

one of the CONTROL MEAsuREs described in Subsection 92.2.1.2 of this

Regulation subject to the approval of the CONTROL OFFICER, provided

however, all access, parking and loading areas primarily used by

rubber tired vehicles shall be paved.

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92.2.1.2 CONTROL MEASURES:

(a) PAvE, or

(b) Apply DUST PALLIATIvES, in compliance with the stabilization

standards set forth in Subsection 92.2.1.3 of this Regulation, or

(c) Apply DUST PALLIATIvEs to vehicle travel lanes within the parking lot

in compliance with the stabilization standards set forth in

Subsection 92.2.1.3 of this Regulation and uniformly apply and

maintain surface gravel to a depth of two (2) inches on the vehicle

parking areas, or

(d) Apply and maintain an alternative CONTROL MEASURE approved in

writing by the CoNTRoL OFFIcER and the Region IX Administrator of

the Environmental Protection Agency (EPA).

92.2.1.3 Stabilization Standards: For the purpose of this rule, CONTROL MEAsuREs

shall be considered effectively implemented when stabilization

observations for FuGrnvE DUST EMissioNs from UNPAVED PARKING LOTS do

not exceed 20% OPAcrrY and do not equal or exceed 0.33 oz/ft 2 silt

loading, or do not exceed 8% silt content, as determined by Subsection

92.4.1 (Test Methods-UNPAVED PARKING LOTS) of these Regulations

except for areas on which gravel has been applied under the provisions of

Subsection 92.2.1.2(c).

92.2.1.4 Prohibition of Dust Over Property Line: Where Best Available Control

Measures provided for in this Regulation have not been applied, No

OWNER AND/OR OPERATOR of an UNPAVED PARKING LOT shall permit a dust

plume from that UNPAVED PARKING LOT to cross a property line.

92.3 Record Keeping Requirements

92.3.1 Record Keeping: Any PERSON subject to the requirements of this

Regulation shall compile and retain records that provide evidence of

CONTROL MEASURE application, by indicating type of treatment or CONTROL

MEASURE, extent of coverage, and date applied. The records and

supporting documentation shall be made available to the CONTROL

OFFICER within 24 hours of a written request.

92.3.2 Records Retention: Copies of the records required by SLibsection 92.3.1

(Record Keeping Requirements) of this Regulation shall be retained for at

least one year. Facilities subject to Section 19 (PART 70 OPERATING

PERMITS) shall maintain records in accordance with Part 70 record

keeping requirements.

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92.4 Test Methods

92.4.1 Stabilization Test Methods For UNPAVED PARKING LOTS:

92.4.1.1 OPACITY Test Method: The purpose of this test method is to estimate the

percent OPACITY of FuGrrIvE DUST plumes caused by vehicle movement

on UNPAVED PARKING Lots. This method can only be conducted by an

individual who has received certification as a qualified Visible EMISSIONS

Evaluator.

(a) Step 1: Stand at least 16.5 feet from th FuGITIVE DUST source in

order to provide a clear view of the EMISSIONS with the sun oriented

in the 140-degree sector to the back. Following the above

requirements, make OPAcrrv observations so that the line of vision

is approximately perpendicular 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.

(b) Step 2: Record the FuGITIvE DUST source location, source type,

method of control used, if any, evaluator’s name, certification data

and affiliation, and a sketch of the observer’s position relative to the

FuGITIvE DusT source. Also, record the time, estimated distance to

the FUGITIvE DUST source location, approximate wind direction,

estimated wind speed, description of the sky condition (presence

and color of clouds), and color of the plume and type of

background on the visible EMISSION observation form both when

OPACITY readings are initiated and completed.

(c) 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 again

at five seconds.

(d) 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 required by the test method, EPA recommends that

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the

plumes

observer estimate the size of vehicles which generate dust

or heavy-duty

for which readings are taken (e.g., mid-size passenger car

traveling when

truck) and the approximate speeds the vehicles are

readings are taken.

(e) Step 5: Repeat Step 3 (Subsection 92.4.1.1(c) of this Regulation)

have

and Step 4 (Subsection 92.4.1.1(d) of this Regulation) until you

occur

recorded a total of 12 consecutive OPAcrrv readings. This will

observation

once six vehicles have driven on the source in your line of

consecutive

for which you are able to take proper readings. The 12

observation

readings must be taken within the same period of

but must not exceed 1 hour. Observations immediately

considered

preceding and following interrupted observations can be

consecutive.

(f) Step 6: Average the 12 OPAcrrY readings together.

OPAcrrY If the average

reading equals 20% or lower, the source is in compliance

with

Regulations.

the OPAcrrv standard described in Section 92 of these

92.4.1.2

the

Silt Content Test Method: The purpose of this test method is to estimate

higher

silt content of the trafficked parts of UNPAVED PARKING LOTS. The

are entrained

the silt content, the greater the amount of fine dust particles that

PARKING

into the atmosphere when cars and trucks drive on UNPAvED

LOTS.

(a) Equipment:

(1) A set of sieves with the following openings: 4 millimeters

(mm), 2 mm, 1 mm, 0.5 mm and 0.25 mm, a lid, and

collector pan

(2) A small whiskbroom or paintbrush with stiff bristles and

dustpan 1 foot in width (the broom/brush should preferably

have one, thin rOw of bristles no longer than 1.5 inches in

length).

(3) A spatula without holes

(4) A. small scale with half ounce increments (e.g. postal!

package scale)

(5) A shallow, lightweight container (e.g. plastic storage

container)

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(6) A sturdy cardboard box or other rigid object with a level surface

(7) A basic calculator

(8) Cloth gloves (optional for handling metal sieves on hot,

sunny days)

(9) Sealable plastic bags (if sending samples to a laboratory)

(10) A pencil/pen and paper

(b) 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 I square foot. Collect a sample of

loose surface material using a whiskbroom or brush and slowly

sweep the material into the dustpan, minimizing escape of dust particles. Use a spatula to lift heavier elements such as gravel.

Only collect dirtlgravel 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 greater than 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 down to 1 cm. In order to confirm that samples are collected to I

cm in 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.

• 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) Step 2: Place a scale on a level surface. Plade a lightweight

container on the scale. Zero the scale with the weight of the 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.

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(d) Step 3: Stack a set of sieves in order according to the size

openings specified above, beginning with the largest size opening

(4 mm) at the top. Place a collector pan underneath the bottom

(0.25 mm) sieve.

(e) 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 car as a wind barricade). Cover the stack with a lid. Lift up the

sieve stack and shake it vigorously up, down and sideways for at

least 1 minute.

(f) 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, restack

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

sieve(s) that contain material, which requires further sifting).

(g) 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 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 material from the collector pan and record its

weight.

(h) Step 7: If the source is an unpaved road, multiply the resulting

weight by 0.38. If the source is an UNPAvED PARKING LoT, multiply

the resulting weight by 0.55. The resulting number is the estimated

silt loading. Then, divide by the total weight of the sample you

recorded earlier in Step 2 (Subsection 92.4.1.2(c) of this

Regulation) and multiply by 100 to estimate the percent silt content.

(1) Step 8: Select another two routinely traveled portions of the

unpaved road or UNPAvED PARKING LOT and repeat this test

method. Once you have calculated the silt loading and percent silt

content of the 3 samples collected, average your results together.

(j) Step 9: Examine Results. If the average silt loading is less than

0.33 ozlft 2,the surface is stable. If the average silt loading is

greater than or equal to 0.33 ozlft 2,then proceed to examine the

average percent silt content. If the source is an UNPAVED PARKING

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LOT arid the average percent sift content is 8% or less, the surface

is stable. If your field test results are within 2% of the standard (for

example, 6%-I 0% silt content on an UNPAVED PARKING LOT), it is

recommended that you collect 3 additional samples from the

source according to Step I (Subsection 92.4.1.2(b) of this

Regulation) and take them to an independent laboratory for silt

content analysis.

(k) Independent Laboratory Analysis: You may choose to collect 3

samples from the source, according to Step I (Subsection

92.4.1.2(b) of this Regulation), and send them to an independent

laboratory for silt 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 Of Surface/Bulk

Loading Samples”, (Fifth Edition, Volume I,

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

History: Initial adoptIon: June 22, 2000

Amended: November 20, 2001; December 17, 2002

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