92.1 FuGITIvE DUST From UNPAVED PARKINGLOTS 92.1.1 Purpose: To 

### limit the EMissioN ofPARTIcuLATE MA1-rER into the AMBIENT AIR from UNPAVED PARKING LOTS; material handling and storage yards; and vehicle and equipment storageyards. Applicability: The provisions of this Regulation shall apply to UNPAVED PARKING LOTS; material handling and storage yards; and vehicle and equipment storage yards which are located 

### in the PM10 N0N-ATrAINMENT AREA (HYDR0GRAPHIc BASIN 212), in the Apex Valley (HYDR0GRAPHIc BASINS 216 and 217), and which are not regulated by Section 94 ofthis Regulation. For the purposes ofthis Regulation, UNPAVED PARKING LOT means any area of5,000 square feet or largerthat is not PAVED and that is used forparking, maneuvering, or storing MOTORVEHIcLEs, equipment, or materials. UNPAvED PARKING LOT includes automobile impound yards, wrecking yards, automobile dismantling yards, salvage yards, material handling yards, and storage yards. For the purposes of this regulation, maneuvering shall not include military maneuvers or exercises conducted on federal facilities. Nothing in Subsections 92.1 through 92.4 ofthese Regulations shall be construed to prevent enforcement of Section 40 (Prohibition ofNuISANcE Conditions) ofthese Regulations. The provisions ofthis Regulation shall not apply to STATIONARY SOURCES as defined in Section 0, exceptthatthese control measures shall be considered as part ofa BACTdetermination. 92.1.3 Effective Date OfThis Regulation: 92.1.3.1 Regulations 92.1 through 92.4 shall be effective in HYDROGRAPHIC BASIN 212 on their adoption by the District Board of Health of Clark County on June22, 2000, exceptas otherwiseprovided herein. 92.1.3.2 Regulations 92.1 through 92.4 shall be effective in HYDR0GRAPHIc BASINS 216 and 217 onApril 1, 2002, exceptas otherwiseprovided herein. 92.2 Requirements:
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Ifr3/i3 SECTION 92- FUGITIVEDUSTFROM UNPAVED PARKING LOTS; MATERAILHANDLINGAND STORAGEYARDS; AND VEHICLEAND EQUIPMENT STORAGEYARDS

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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 ofthis Regulation by April 1, 2003. For UNPAVED PARKING LOTS that are utilized intermittently, for a 

### period of 35 days or less during the calendaryear, the OWNERAND/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 ofthis 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) Ifthe UNPAVED PARKING LOT is used primarily for storage ofnon-rubber tired vehicles or equipment, the OwNER/OPERAToR shall implement one ofthe CONTROLMEAsuREsdescribed in Subsection 92.2.1.2 ofthis Regulation subject to the approval ofthe CONTROL OFFICER, provided however, all access, parking and loading areas primarily used by rubbertired vehicles shall be paved.



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92.2.1.2 CONTROLMEASURES: (a) PAvE, or (b) Apply DUST PALLIATIvES, in compliance with the stabilization standards setforth in Subsection 92.2.1.3 ofthis 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 CoNTRoLOFFIcER and the Region IX Administratorof the Environmental Protection Agency (EPA). 92.2.1.3 Stabilization Standards: For the purpose ofthis rule, CONTROL MEAsuREs shall be considered effectively implemented when stabilization observations for FuGrnvE DUST EMissioNs from UNPAVED PARKINGLOTS 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 exceptfor areas on which gravel has been applied underthe 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 plumefrom that UNPAVED PARKINGLOTto 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 oftreatment 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 ofa written request. 

### 92.3.2 Records Retention: Copies oftherecords required bySLibsection 92.3.1 (Record Keeping Requirements) ofthis Regulation shall be retained forat least oneyear. 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 TestMethods
92.4.1 StabilizationTestMethods For UNPAVED PARKING LOTS:
92.4.1.1 OPACITY Test Method: The purpose ofthis 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 orderto provide a clearview ofthe EMISSIONS with the sun oriented in the 140-degree sector to the back. Following the above requirements, make OPAcrrv observations so that the line ofvision is approximately perpendicular to the dust plume and wind direction. Ifmultiple plumes are involved, do not include more than one plume in the line ofsight atone time. (b) Step 2: Record the FuGITIvE DUST source location, source type, method ofcontrol used, if any, evaluator’s name, certification data and affiliation, and a sketch ofthe observer’s position relativeto 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 OPACITYreadings 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 pervehicle, beginning with the firstreading atzero 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 atfive 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 ofEMISSIONS for a 5-second period.’ While it is not required by the test method, EPA recommends that
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the observer estimate the size of vehicles which generate dust plumes forwhich readings are taken (e.g., mid-size passenger car or heavy-duty truck) and the approximate speeds the vehicles are traveling when readings aretaken. (e) Step 5: Repeat Step 3 (Subsection 92.4.1.1(c) ofthis Regulation) and Step 4 (Subsection 92.4.1.1(d) of this Regulation) until you have recorded a total of 12 consecutive OPAcrrv readings. This will occur once six vehicles have driven on the source in your line of observation forwhichyou are abletotake properreadings. The 12 consecutive readings must be taken within the same period of observation butmustnotexceed 1 hour. Observations immediately preceding and following interrupted observations can be considered consecutive. (f) Step 6: Average the 12 OPAcrrY readings together. Ifthe average OPAcrrY reading equals 20% or lower, the source is in compliance with the OPAcrrv standard described in Section 92 of these Regulations. 92.4.1.2 Silt Content Test Method: The purpose ofthis test method is to estimate the silt content of the trafficked parts of UNPAVED PARKING LOTS. 

### The higher the silt content, the greater the amount offine dust particles that areentrained into the atmospherewhen cars and trucks drive on UNPAvED PARKING 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 collectorpan (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 spatulawithoutholes (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) Abasic calculator (8) Cloth gloves (optional for handling metal sieves on hot, sunnydays) (9) Sealableplasticbags 

### (ifsending samplesto a laboratory) (10) Apencil/pen and paper (b) Step 1: Look for a routinely traveled surface, as evidenced by tire tracks (only collectsamplesfrom surfacesthatarenotdamp dueto precipitation ordew). This statementis notmeantto be a standard in itselffor 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 collectdirtlgravel to an approximate depth of3/8 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, awooden dowel orother similarnarrow object at least one foot in length can be laid horizontally across the survey area while a metricruleris held perpendiculartothedowel.

• At this point, you can choose to place the sample collected into a plastic bag or container and take itto an independent laboratory for silt content analysis. A reference to the procedure the laboratory is requiredtofollow is atthe end of this section. (c) Step 2: Place a scale on a level surface. Plade a lightweight containeron the scale. Zero the scale with the weight ofthe empty container on it. Transferthe 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 ofdust particles by slowly brushing material into the stack with a whiskbroom or brush (on windy days, use the trunk or door ofa car as a wind barricade). Coverthe stackwith a lid. Liftupthe 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 thefinest sieve through which itcan pass; e.g., material in each sieve (besides the top sieve that captures a range oflarger elements) should lookthe same size. Ifthis is notthe case, restack the sieves and collectorpan, coverthe stackwiththe lid, and shake it again for at least 1 minute (you only need to reassemble the sieve(s) thatcontain material, which requires furthersifting). (g) Step 6: After disassembling the sieves and collector pan, slowly sweep the material from the collectorpan into the empty container originally.used to collect and weigh the entire sample. Takecareto minimize escape ofdust particles. You do not need to do anything with material captured in the sieves; only the collectorpan. Weigh the containerwith the materialfromthe collectorpan and record

### its weight. (h) Step 7: If the source is an unpaved road, multiply the resulting weight by 0.38. Ifthe source is an UNPAvED PARKING LoT, multiply 

### the resulting weightby 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 multiplyby 100to estimatethe percentsiltcontent. (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 contentofthe 3 samples collected, average yourresults 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. Ifthe source is an UNPAVED PARKING 

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LOT 

### arid the average percent sift content is 8% or less, the surface is stable. Ifyourfield test results are within 2% ofthe standard (for example, 

### 6%-I0% 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 contentanalysis. (k) Independent Laboratory Analysis: You may choose to collect 3 samples from the source, according to Step I (Subsection 92.4.1.2(b) ofthis Regulation), and send them to an independent laboratory for silt content analysis rather than conduct the sieve field procedure. Ifso, the test method the laboratory is required to use is:“Procedures ForLaboratoryAnalysis OfSurface/Bulk Loading Samples”, (Fifth Edition, Volume I, Appendix C.2.3 “SiltAnalysis”, 1995), AP-42, Office ofAir Quality Planning & Standards, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina

History: Initial adoptIon: June 22, 2000 Amended: November20, 2001; December 17, 2002



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