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Subpart U

— Standards of Performance for the Phosphate Fertilizer Industry: Superphosphoric Acid Plants § 60.210 Applicability and designation of affected facility. (a) The affected facility to which the provisions of this subpart apply is each superphosphoric acid plant having a design capacity of more than 15 tons of equivalent P 2 O 5 feed per calendar day. For the purpose of this subpart, the affected facility includes any combination of: eva porators, hot wells, acid sumps, and cooling tanks. (b) Any facility under paragraph (a) of this section that commences construction or modification after October 22, 1974, is subject to the requirements of this subpart. § 60.211 Definitions. As used in th is subpart, all terms not defined herein shall have the meaning given them in the Act and in subpart A of this part. (a) Superphosphoric acid plant means any facility which
concentrates wet

- process phosphoric acid to 66 percent or greater P 2 O 5 content by weight for eventual consumption as a fertilizer. A s uperphosphoric acid plant includes, but is not limited to: evaporators, hot wells, acid sumps, oxidation reactors, and cooling tanks
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(b) Total fluorides means elemental fluorine and all fluoride compound s as measured by reference methods specified in § 60.214, or equivalent or alternative methods. (c) Equivalent P 2 O 5 feed means the quantity of phosphorus, expressed as phosphorus pentoxide, fed to the process. § 60.212 Standard for fluorides. (a) On and after the date on which the performance test required to be conducted by § 60.8 is completed, no owner or operator subject to the provisions of this subpart shall cause to be discharged into the atmosphere from any affected facility any gases wh ich contain total fluorides in excess of 5.0 g/megagram (Mg) of equivalent P 2 O 5 feed (0.010 lb/ton). § 60.213 Monitoring of operations. (a) The owner or operator of any superphosphoric acid plant subject to the provisions of this subpart shall install, cal ibrate, maintain, and operate a flow monitoring device which can be used to determine the mass flow of phosphorus

- bearing feed material to the process. The flow monitoring device shall have an accuracy of ±5 percent over its operating range. (b) The owner or operator of any superphosphoric acid plant shall maintain a daily record of equivalent P 2 O 5 feed by first determining the total mass rate in Mg/hr of phosphorus

- bearing feed using a flow monitoring device meeting the requirements ofP age 3 of 7

paragraph (a) of th is section and then by proceeding according
to § 60.214(b)(3). (c) Except as specified in paragraph (d) of this section,
t T he owner or operator of any superphosphoric acid plant subject to the provisions of this part shall install, calibrate, maintain, an d operate a monitoring device which continuously measures and permanently records the total pressure drop across the process scrubbing system absorber . The monitoring device shall have an accuracy of ±5 percent over its operating range. (d) An y affected fa cility as defined in § 60.2 10 ( a ) that commences construction, modification or reconstruction after [ d ate of p ublication of the final rule in the Federal Register ] is subject to the requirements of this paragraph instead of the requirements in paragraph (c) of this section
. If an absorber is used to comply with § 6 0
. 212, then the owner or operator shall continuously monitor pressure drop through the absorber and meet the requirements specified in paragraphs (d) ( 1 ) through (d) ( 4 ) of this section. (1) The owne r or operator shall i nstall, calibrate, maintain, and operate a continuous monitoring system (CMS) that continuously measures and permanently records the pressure at the gas stream inlet and outlet of the absorber. T he pressure at the gas stream inlet of t he absorber may be measured usingP age 4 of 7

amperage on the blower if a correlation between pressure and amperage is established
. (2) The CMS must have an accuracy of ± 5 percent over the normal range measured or 0.12 kilopascals (0.5 inches of water column), whiche ver is greater. (3) The owner or operator shall establish an allowable range for the pressure drop through the absorber. The allowable range is ±20 percent of the arithmetic average of the three test runs conducted during the performance test required in § 60.8. The Administrator retains the right to reduce the ±20 percent adjustment to the baseline average values of operating ranges in those instances where per formance test results indicate that a source's level of emissions is near the value of an applicable emissions standard
. However, the adjustment must not be reduced to less than ±10 percent under any instance. (4) The owner or operator shall demonstrate co ntinuous compliance by maintaining the daily average pressure drop through the absorber to within the allowable range established in paragraph (d)(3) of this section. The daily average pressure drop through the absorber for each operating day shall be calc ulated using the data recorded by the monitoring system. If the emissions unit operation is continuous, the operating day is a 24

- hour period. If the emissions unit operation is not continuous, the operating day is the total number of hours ofP age 5 of 7

control devi ce operation per 24

- hour period. Valid data points must be available for 75 percent of the operating hours in an operating day to compute the daily average. § 60.214 Test methods and procedures. (a) In conducting the performance tests required in § 60.8,
t he owner or operator shall use as reference methods and procedures the test methods in appendix A of this part or other methods and procedures as specified in this section, except as provided in § 60.8(b). (b) The owner or operator shall determine complian ce with the total fluorides standard in § 60.212 as follows: (1) The emission rate (E) of total fluorides shall be computed for each run using the following equation:

where:

E = emission rate of total fluorides, g/Mg (lb/ton) of

equivalent P 2 O 5 feed. C si = concentration of total fluorides from emission point

“i,” mg/dscm (gr/dscf). Q sdi = volumetric flow rate of effluent gas from emission

point “i,” dscm/hr (dscf/hr). N = n umber of emission points associated with the

affected facility. P = equivalent P 2 O 5 feed rate, Mg/hr (ton/hr). K = conversion factor, 1000 mg/g (7,000 gr/lb).P age 6 of 7

(2) Method 13A or 13B shall be used to determine the total fluorides concentration (C si ) and volumetric flow rate (Q sdi ) of the effluent gas from each of the emission points. T he sampling time and sample volume for each run shall be at least 60 minutes and 0.85 dscm (30 dscf). (3) The equivalent P 2 O 5 feed rate (P) shall be computed for each run using the following equation:
P=M p R p where:

M p = total mass flow rate of phosphoru s - bearing feed,

Mg/hr (ton/hr). R p = P 2 O 5 content, decimal fraction. (i) The accountability system of § 60.213(a) shall be used to determine the mass flow rate (M p ) of the phosphorus

- bearing feed. (ii) The Association of Official Analytical Chemists (AOAC ) Method 9 (incorporated by reference

— see § 60.17) shall be used to determine the P 2 O 5 content (R p ) of the feed. § 60.215 Recordkeeping. An affected facility as defined in § 60.210(a) that commences construction, modification, or reconstruction after [ date of publication of the final rule in the Federal Register ] is subject to the requirements of this section. You must maintain the records identified as specified in § 60.7(f) and inP age 7 of 7

paragraphs (a) and (b) of this section. All records required by this subpar t must be maintained on site for at least 5 years. (a) Records of the daily average pressure drop through the absorber. (b) Records of deviations. A deviation is determined to have occurred when the monitoring data or lack of monitoring data result in any one of the criteria specified in paragraphs (b)(1) and (b)(2) of this section being met. (1) A deviation occurs when the daily average value of a monitored operating parameter is less than the minimum pressure drop, or greater than the maximum pressure dro p established in § 60.213(d)(3). (2) A deviation occurs when the monitoring data are not available for at least 75 percent of the operating hours in a day.