Arizona Administrative Code › Title 18 - ENVIRONMENTAL QUALITY › Chapter 2 - DEPARTMENT OF ENVIRONMENTAL - QUALITY AIR POLLUTION CONTROL › APPENDICES › Appendix 2 - Test Methods and Protocols

Current through Register Vol. 30, No. 28, July 12, 2024
The following test methods and protocols are approved for use
				  as directed by the Department under this Chapter. These standards are
				  incorporated by reference as applicable requirements revised as of June 30,
				  2017, and no future editions or amendments. These standards are on file with
				  the Department, and are also available from the U.S. Government Printing
				  Office, Superintendent of Documents, bookstore.gpo.gov, Mail Stop: SSOP
				  IDCC-SSOM, Washington, D.C. 20402-9328.
A.
40 CFR 50;
B.
40 CFR 50, all appendices;
C.
40 CFR 51, Appendix M, Section IV of Appendix
				  S, and Appendix W;
D.
40 CFR 52, Appendices D and E;
E.
40 CFR 53;
F.
40 CFR 58;
G.
40 CFR 58, all appendices;
H.
40 CFR 60, all appendices;
I.
40 CFR 61, all appendices;
J.
40 CFR 63, all appendices;
K.
40 CFR 75, all appendices.
L.
40 CFR 51.128, Appendix A(1)(B).
M.
Silt Content Test Method. The purpose of this
				  test method is to estimate the silt content of the trafficked parts of
				  commercial farm roads, as defined in
				  R18-2-610.
				  The higher the silt content, the more fine dust particles that are released
				  when cars and trucks drive on commercial farm roads.
1. Equipment:
a. A set of sieves with the following openings: 4 millimeters
				  (mm), 2mm, 1 mm, 0.5 mm and 0.25 mm and a lid and collector pan
b. A small whisk broom or paintbrush with stiff bristles 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. A spatula without holes A small scale with half ounce
				  increments (e.g. postal/package scale)
d. A shallow, lightweight container (e.g. plastic storage
				  container)
e. A sturdy cardboard box or other rigid object with a level
				  surface
f. Basic calculator
g. Cloth gloves (optional for handling metal sieves on hot,
				  sunny days)
h. Sealable plastic bags (if sending samples to a
				  laboratory)
i. Pencil/pen and paper
2. Step 1: Look for a routinely-traveled surface, as
				  evidenced by tire tracks. [Only collect samples from surfaces that are not wet
				  or damp due to precipitation, dew or watering.] 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 using a whisk
				  broom 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 dirt/gravel 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 down to 1 cm. In order to confirm that samples are collected to 1 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 in subsection (10) below.
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
				  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.
4. 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.
Step 4: Carefully pour the sample into the sieve stack,
				  minimizing escape of dust particles by slowly brushing material into the stack
				  with a whisk broom 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.
5. 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 sieve(s) that contain material which requires further
				  sifting.)
6. 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.
7. 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
				  and multiply by 100 to estimate the percent silt content.
8. 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.
9. Step 9: Examine Results. If the average silt loading is
				  less than 0.33 oz/ft2, the surface is STABLE. If the average silt loading is
				  greater than or equal to 0.33 oz/ft2, then proceed to examine the average
				  percent silt content. If the source is an unpaved road and the average percent
				  silt content is 6% or less, the surface is STABLE. If the source is an unpaved
				  parking lot and the average percent silt content is 8% or less, the surface is
				  STABLE. If your field test results are within 2% of the standard (for example,
				  4%-8% silt content on an unpaved road), it is recommended that you collect 3
				  additional samples from the source according to Step 1 and take them to an
				  independent laboratory for silt content analysis.
10. Independent Laboratory Analysis: You may choose to
				  collect 3 samples from the source, according to Step 1, 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 comes
				  from the from the following text:
Procedures For Laboratory Analysis Of
				  Surface/Bulk Dust 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.