Source: http://regulations.delaware.gov/register/november2002/proposed/6%20DE%20Reg%20609%2011-01-02.htm
Timestamp: 2018-06-23 06:26:08
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6 DE Reg 60 11-01-02
Air Quality Management Section
Statutory Authority:7 Delaware Code,Section 6010 (7 Del.C. §6010)
SAN # 2002-15
Reg. No 3, Sec. 11, Ambient Air Quality Standards
1. Title Of The Regulation
Regulation No. 3, Section 11 (PM10 and PM2.5 Particulates), “Ambient Air Quality Standards”
The Department proposes to revert Delaware’s Regulation 3, Section 11 Particulate Matter (PM10 ) air quality standards back to their pre-November, 1999 form. This action is necessary in response to the March 26, 2002 Court of Appeals decision that vacated EPA’s standards that were set forth in the 62 FR 38711, dated July 18, 1997. That decision resulted in the standard contained in DNREC’S November 3, 1999 State Implementation Plan (SIP) submittal being less restrictive than the current PM10 National Ambient Air Quality Standards(NAAQS). As a result, EPA cannot approve Delaware’s SIP revision containing a less restrictive PM10 NAAQS standard than the 1987 standard.
The impacts of proposed amendments are minimal. The proposed changes will not change the annual and 24-hour average concentration standards of 50 ug/m3 and 150 ug/m3, respectively. The changes are primarily a technical, procedural change in the Department’s methodology of determining concentrations from monitored data.
7 Delaware Code, Chapter 60
The public comment period for this proposed regulation will extend through December 1, 2001. Interested parties may submit comments in writing to: John Sipple, Air Quality Management Section, 156 South State Street, Dover, DE 19901, and/or statements and testimony may be presented either orally or in writing at the public hearing to be held Tuesday, November 26, 2002 beginning at 6:00 pm in the DNREC R & R Auditorium, 89 Kings Highway, Dover DE.
7) Prepared By: John Sipple (302) 739-4791
Regulation No. 3
1.1 Air Quality Standards are required to assure that ambient air quality shall be consistent with established criteria and shall serve to effectively and reasonably manage the air resources of the State of Delaware.
1.2 At such time as additional pertinent information becomes available with respect to applicable air quality criteria, recommendations shall be incorporated and the air quality standards shall be subject to revisions.
1.3 The absence of a specific ambient air quality standard shall not preclude actions by the Department to control contaminants to assure protection, safety, welfare, and comfort of the people of the State of Delaware.
1.4 Air Quality Standards are defined by frequency distribution presentations and arithmetic averages. The characteristic parameters describing the frequency distribution are the geometric mean and 99th percentile.
a. The geometric mean is defined as the Nth root of the product of N numbers. Assuming a log-normal cumulative frequency distribution, the 50th percentile value will be equal to the geometric mean.
b. The arithmetic average (mean is defined as the sum of a set of values divided by the number of values.
c. The 99th percentile for a group of numbers is defined as that value which is exceeded by one percent of the numbers.
1.5 The ambient air quality values stated herein shall apply to all areas outside a source property line.
1.6 The sampling and analytical procedures and techniques employed to determine ambient air concentrations of contaminants shall be consistent with methods which result in a representative evaluation of the prevailing conditions. The following methods shall be used directly or employed as reference standards against which other methods may be calibrated;
a. Ambient concentrations of total suspended particulates shall be determined by the reference high volume method in accordance with 40 CFR, Part 50, Appendix B, June 29, 1979.
b. Ambient concentrations of sulfur dioxide shall be determined by the reference or equivalent method in accordance with 40 CFR, Part 50, Appendix A, June 29, 1979.
c. Ambient concentrations of carbon monoxide shall be determined by the reference method in accordance with 40 CFR, Part 50, Appendix C, June 29, 1979.
d. Ambient concentrations of ozone corrected for interferences due to nitrogen oxides and sulfur dioxide shall be determined by the reference method in accordance with 40 CFR, Part 50, Appendix D, June 29, 1979.
e. Ambient concentrations of methane and non-methane hydrocarbons shall be determined by the reference method in accordance with 40 CFR, Part 50, Appendix E, June 29, 1979.
f. Ambient concentrations of nitrogen dioxide shall be determined by the reference method in accordance with 40 CFR, Part 50, Appendix F, June 29, 1979.
g. Ambient concentrations of hydrogen sulfide shall be determined by gas chromatographic separation - flame photometric detection.
h. Ambient concentrations of lead shall be determined by the reference method in accordance with 40 CFR, Part 50, Appendix G, June 29, 1979.
i. Ambient concentrations of PM10 particulate shall be determined by a reference method in accordance with 40 CFR, Part 50, Appendix J, or an equivalent method.
j. Ambient concentrations of PM2.5 particulate shall be determined by the reference method based on 40 CFR, Part 50, Appendix L, as found in the Federal Register dated July 18, 1997, on page 38714 – 38752.
1.7 Air quality standards are expressed in metric units with the approximate equivalent volumetric units in parentheses. The standard conditions for air ambient monitoring is 760 mm. Hg and 25oC. The formula to convert metric units to parts per million (ppm) is:
ppm (vol) = Fg/m3 X .024465 or mg/m3 X 24.465 X 10-6
----------------- ---------------------
MW MW
MW is molecular weight of the contaminant being measured.
02/01/81
Section 2 - General Restrictions
2.1 No person shall cause the Air Quality Standards specified in this Regulation to be exceeded.
Section 3 - Suspended Particulates
3.1 The Primary Ambient Air Quality Standards for Particulate Matter are:
a. An annual geometric mean of 75 micrograms per cubic meter not to be exceeded, based upon twenty-four hour average concentrations.
b. A value of 260 micrograms per cubic meter not to be exceeded more than once per year, based upon twenty-four hour average concentrations.
3.2 The Secondary Ambient Air Quality Standards for Particulate Matter are:
a. An annual geometric mean of 60 micrograms per cubic meter as a guideline for achieving the secondary standard based upon twenty- four hour average concentrations.
b. A value of 150 micrograms per cubic meter not to be exceeded more than once per year, based upon twenty-four hour average concentrations.
Section 4 - Sulfur Dioxide
4.1 The Primary Ambient Air Quality Standards for Sulfur Oxides measured as Sulfur Dioxide are as follows:
a. An annual arithmetic average value of 80 Fg/m3, (0.03 ppm) not to be exceeded, based upon twenty-four hour average concentrations.
b. A twenty-four average value of 365 Fg/m3 (0.14 ppm) not to be exceeded more than once per year based upon twenty-four hour average concentrations.
4.2 The Secondary Ambient Air Quality Standards for Sulfur Oxides measured as Sulfur Dioxide are as follows:
a. A three-hour average value of 1300 micrograms per cubic meter (0.5 ppm), not to be exceeded more than once per year.
Section 5 - Carbon Monoxide
5.1 The average concentration of carbon monoxide taken over any consecutive eight (8) hours shall not exceed a value of 10 milligrams per cubic meter (9 ppm) more than once per year.
5.2 The average concentration of carbon monoxide taken over any one (1) hour period shall not exceed 40 milligrams per cubic meter (35 ppm) more than once per year.
Section 6 - Ozone
6.1 1-hour primary and secondary ambient air quality standards for ozone
The average number of days per calendar year with a maximum one hour average value exceeding 235 Fg/m3 (0.12 ppm) shall be equal to or less than one, averaged over three consecutive years. This standard shall be applicable to New Castle and Kent Counties.
6.2 8-hour primary and secondary ambient air quality standards for ozone
The average of the fourth highest daily maximum 8-hour average ozone concentration is less than or equal to 0.08 ppm, averaged over three consecutive years. This standard applies to all Counties in Delaware.
Section 7 - Hydrocarbons
7.1 The hydrocarbons standard in subsection 7.2 is for use as a guide in devising implementation plans to achieve the ozone standard.
7.2 The average concentration of hydrocarbons, exclusive of methane, taken over a three (3) hour period from 6:00 to 9:00 a.m., local time, shall not exceed 160 micrograms per cubic meter (0.24 ppm) more than once per year.
Section 8 - Nitrogen Dioxide
8.1 The annual arithmetic mean concentration of nitrogen dioxide shall not exceed 100 micrograms per cubic meter (0.05 ppm).
Section 9 - Hydrogen Sulfide
9.1 The average concentration of hydrogen sulfide taken over any consecutive three (3) minutes shall not exceed 0.06 ppm.
9.2 The average concentration of hydrogen sulfide taken over any consecutive 60 minutes shall not exceed 0.03 ppm.
Section 10 - Lead
10.1 The 24 hour concentration of lead averaged over a calendar quarter shall not exceed 1.5 micrograms per cubic meter.
09/11/99 __/__/03
Section 11 - PM10 and PM2.5 Particulates
11.1 The Primary and Secondary Ambient Air Quality Standards for Particulate Matter, measured as PM10 are:
a. 150 micrograms per cubic meter (Fg/m3), 24 hour average concentration. The standards are attained when the 99th percentile 24-hour concentration, as determined in accordance with 40 CFR, Part 50, Appendix N, as found in the Federal Register dated July 18, 1997, on page 38759, is less than or equal to 150 micrograms per cubic meter (Fg/m3) expected number of days per calendar year with a 24-hour average concentration above 150 Fg/m3, as determined in accordance with 40 CFR, Part 50, Appendix K, is equal to or less than one.
b. 50 micrograms per cubic meter (Fg/m3), annual arithmetic mean. The standards are attained when the expected annual arithmetic mean concentration, as determined in accordance with 40 CFR, Part 50, Appendix KN, as found in the Federal Register dated July 18, 1997, on page 38759, is less than or equal to 50 Fg/m3.
11.2 The Primary and Secondary Ambient Air Quality Standards for Particulate Matter, measured as PM2.5 are:
a. 65 micrograms per cubic meter (Fg/m3) 24-hour average concentration. The 24-hour primary and secondary PM2.5 standards are met when the 98th percentile 24-hour concentration, as determined in accordance with 40 CFR, Part 50, Appendix N, as found in the Federal Register dated July 18, 1997, on page 38757 - 38758, is less than or equal to 65 Fg/m3
b. 15.0 micrograms per cubic meter (Fg/m3) annual arithmetic mean concentration. The annual primary and secondary PM2.5 standards are met when the annual arithmetic mean concentration, as determined in accordance with 40 CFR, Part 50, Appendix N, as found in the Federal Register dated July 18, 1997, on page 38756 - 38757, is less than or equal to 15.0 Fg/m3
6 DE Reg. 609 (11/01/02) (Prop.)