40 CFR 61.207 - Radium-226 sampling and measurement procedures.

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§ 61.207 Radium-226 sampling and measurement procedures.
(a) Before removing phosphogypsum from a stack for distribution in commerce pursuant to § 61.204, or § 61.206, the owner or operator of a phosphogypsum stack shall measure the average radium-226 concentration at the location in the stack from which phosphogypsum will be removed. Measurements shall be performed for each such location prior to the initial distribution in commerce of phosphogypsum removed from that location and at least once during each calendar year while distribution of phosphogypsum removed from the location continues.
(1) A minimum of 30 phosphogypsum samples shall be taken at regularly spaced intervals across the surface of the location on the stack from which the phosphogypsum will be removed. Let n 1 represent the number of samples taken.
(2) Measure the radium-226 concentration of each of the n 1 samples in accordance with the analytical procedures described in 40 CFR part 61, appendix B, Method 114.
(3) Calculate the mean, x 1, and the standard deviation, s 1, of the n 1 radium-226 concentrations:
Where x 1 and s 1 are expressed in pCi/g.
(4) Calculate the 95th percentile for the distribution, x*, using the following equation:
Where x* is expressed in pCi/g.
(5) If the purpose for removing phosphogypsum from a stack is for distribution to commerce pursuant to § 61.206, the owner or operator of a phosphogypsum stack shall report the mean, standard deviation, 95th percentile and sample size. If the purpose for removing phosphogypsum from a stack is for distribution to commerce pursuant to § 61.204, the additional sampling procedures set forth in paragraphs (b) and (c) of this section shall apply.
(b) Based on the values for x 1 and x* calculated in paragraphs paragraphs (a)(3) and (4) of this section, determine which of the following conditions will be met:
(1) If x 1 < 10 pCi/g and x* ≤ 10 pCi/g; phosphogypsum may be removed from this area of the stack for distribution in commerce pursuant to § 61.204.
(2) If x 1, < 10 pCi/g and x* > 10 pCi/g, the owner or operator may elect to follow the procedures for further sampling set forth in paragraph (c) of this section:
(3) If x 1 ≥ 10 pCi/g; phosphogypsum shall not be removed from this area of the stack for distribution in commerce pursuant to § 61.204.
(c) If the owner or operator elects to conduct further sampling to determine if phosphogypsum can be removed from this area of the stack, the following procedure shall apply. The objective of the following procedure is to demonstrate, with a 95% probability, that the phosphogypsum from this area of the stack has a radium-226 concentration no greater than 10 pCi/g. The procedure is iterative, the sample size may have to be increased more than one time; otherwise the phosphogypsum cannot be removed from this area of the stack for distribution to commerce pursuant to § 61.204.
(1)
(i) Solve the following equation for the total number of samples required:
(ii) The sample size n 2 shall be rounded upwards to the next whole number. The number of additional samples needed is n A = n 2n 1.
(2) Obtain the necessary number of additional samples, n A, which shall also be taken at regularly spaced intervals across the surface of the location on the stack from which phosphogypsum will be removed.
(3) Measure the radium-226 concentration of each of the n A additional samples in accordance with the analytical procedures described in 40 CFR part 61, appendix B, Method 114.
(4) Recalculate the mean and standard deviation of the entire set of n 2 radium-226 concentrations by joining this set of n A concentrations with the n 1 concentrations previously measured. Use the formulas in paragraph (a)(3) of this section, substituting the entire set of n 2 samples in place of the n 1 samples called for in paragraph (a)(3) of this section, thereby determining the mean, x 2, and standard deviation, s 2, for the entire set of n 2 concentrations.
(5) Repeat the procedure described in paragraph (a)(4) of this section, substituting the recalculated mean, x 2, for x 1, the recalculated standard deviation, s 2, for s 1, and total sample size, n 2, for n 1.
(6) Repeat the procedure described in paragraph (b) of this section, substituting the recalculated mean, x 2 for x 1.
[64 FR 5579, Feb. 3, 1999]

Title 40 published on 2013-07-01

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  • 2014-02-27; vol. 79 # 39 - Thursday, February 27, 2014
    1. 79 FR 11228 - Revisions to Test Methods and Testing Regulations
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      Final rule.
      This final rule is effective on February 27, 2014. The incorporation by reference materials listed in the rule are approved by the Director of the Federal Register as of February 27, 2014.
      40 CFR Parts 51, 60, 61, and 63

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Title 40 published on 2013-07-01

The following are ALL rules, proposed rules, and notices (chronologically) published in the Federal Register relating to 40 CFR 61 after this date.

  • 2014-05-02; vol. 79 # 85 - Friday, May 2, 2014
    1. 79 FR 25388 - Revisions to National Emission Standards for Radon Emissions From Operating Mill Tailings
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      ENVIRONMENTAL PROTECTION AGENCY
      Proposed rule.
      Comments must be received on or before July 31, 2014.
      40 CFR Part 61