Page 1 of 8

Subpart X—Standards of Performance for the Phosphate Fertilizer 

Industry: Granular Triple Superphosphate Storage Facilities

Contents

§60.240 Applicability and designation of affected facility.

§60.241 Definitions.

§60.242 Standard for fluorides.

§60.243 Monitoring of operations.

§60.244 Test methods and procedures.

§60.240 Applicability and designation of affected facility.

(a) The affected facility to which the provisions of this 

subpart apply is each granular triple superphosphate storage 

facility For the purpose of this subpart, the affected facility 

includes any combination of: Storage or curing piles, conveyors, 

elevators, screens and mills. 

(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.

§60.241 Definitions.

As used in this subpart, all terms not defined herein shall 

have the meaning given them in the Act and in subpart A of this 

part. 

(a) Granular triple superphosphate storage facility means 

any facility curing or storing fresh granular triple 

superphosphate. 
Page 2 of 8

(b) Total fluorides means elemental fluorine and all 

fluoride compounds as measured by reference methods specified in 

§60.244, or equivalent or alternative methods. 

(c) Equivalent P2O5 stored means the quantity of phosphorus, 

expressed as phosphorus pentoxide, being cured or stored in the 

affected facility. 

(d) Fresh granular triple superphosphate means granular 

triple superphosphate produced within the preceding 72 hours.

§60.242 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 which contain total fluorides in excess of 0.25 

g/hr/megagram (Mg) of equivalent P2O5 stored (5.0 × 10−4 lb/hr/ton 

of equivalent P2O5 stored).

(b) No owner or operator subject to the provisions of this 

subpart shall ship fresh granular triple superphosphate from an 

affected facility.

§60.243 Monitoring of operations.

(a) The owner or operator of any granular triple 

superphosphate storage facility subject to the provisions of 

this subpart shall maintain an accurate account of triple 
Page 3 of 8

superphosphate in storage to permit the determination of the 

amount of equivalent P2O5 stored. 

(b) The owner or operator of any granular triple 

superphosphate storage facility subject to the provisions of 

this subpart shall maintain a daily record of total equivalent 

P2O5 stored by multiplying the percentage P2O5 content, as 

determined by §60.244(c)(3), times the total mass of granular 

triple superphosphate stored. 

(c) Except as specified in paragraph (e) of this section,

tThe owner or operator of any granular triple superphosphate 

storage facility subject to the provisions of this subpart shall 

install, calibrate, maintain, and operate a monitoring device 

which continuously measures and permanently records the total 

pressure drop across any process scrubbing system absorber. The 

monitoring device shall have an accuracy of ±5 percent over its

operating range. 

(d) The owner or operator of any granular triple 

superphosphate storage facility subject to the provisions of 

this subpart shall develop for approval by the Administrator a 

site-specific methodology including sufficient recordkeeping for

the purposes of demonstrating compliance with §60.242 (b). 

(e) Any facility under § 60.240(a) that commences 

construction, modification, or reconstruction after [date of 

publication of the final rule in the Federal Register] is
Page 4 of 8

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 § 60.232, then the owner or operator shall 

continuously monitor pressure drop through the absorber and meet 

the requirements specified in paragraphs (e)(1) through (e)(4) 

of this section.

(1) The owner or operator shall install, 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. The pressure at 

the gas stream inlet of the absorber may be measured using 

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), whichever 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 performance test results indicate that a 

source's level of emissions is near the value of an applicable 
Page 5 of 8

emissions standard. However, the adjustment must not be reduced 

to less than ±10 percent under any instance.

(4) The owner or operator shall demonstrate continuous 

compliance by maintaining the daily average pressure drop 

through the absorber to within the allowable range established 

in paragraph (e)(3) of this section. The daily average pressure 

drop through the absorber for each operating day shall be 

calculated 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 of 

control device 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.

§60.244 Test methods and procedures.

(a) The owner or operator shall conduct performance tests 

required in §60.8 only when the following quantities of product 

are being cured or stored in the facility.

(1) Total granular triple superphosphate is at least 10 

percent of the building capacity, and 

(2) Fresh granular triple superphosphate is at least 6

percent of the total amount of triple superphosphate, or

(3) If the provision in paragraph (a)(2) of this section 

exceeds production capabilities for fresh granular triple 
Page 6 of 8

superphosphate, fresh granular triple superphosphate is equal to 

at least 5 days maximum production.

(b) In conducting the performance tests required in §60.8, 

the 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).

(c) The owner or operator shall determine compliance with 

the total fluorides standard in §60.242 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/hr/Mg 

(lb/hr/ton) of equivalent P2O5 stored.

Csi = concentration of total fluorides from emission point 

“i,” mg/dscm (gr/dscf).

Qsdi = volumetric flow rate of effluent gas from emission 

point “i,” dscm/hr (dscf/hr).

N = number of emission points in the affected facility.

P = equivalent P2O5 stored, metric tons (tons).

K = conversion factor, 1000 mg/g (7,000 gr/lb).

(2) Method 13A or 13B shall be used to determine the total 

fluorides concentration (Csi) and volumetric flow rate (Qsdi) of 

the effluent gas from each of the emission points. The sampling 
Page 7 of 8

time and sample volume for each run shall be at least 60 minutes 

and 0.85 dscm (30 dscf).

(3) The equivalent P2O5 feed rate (P) shall be computed for 

each run using the following equation:

P=Mp Rp

where:

Mp = amount of product in storage, Mg (ton). 

Rp = P2O5 content of product in storage, weight fraction.

(i) The accountability system of §60.243(a) shall be used 

to determine the amount of product (Mp) in storage. 

(ii) The Association of Official Analytical Chemists (AOAC) 

Method 9 (incorporated by reference—see §60.17) shall be used to 

determine the P2O5 content (Rp) of the product in storage. 

EDITORIAL NOTE: At 65 FR 61757, Oct. 17, 2000, §60.244 (c)(1) 

was amended. However, the instruction, which read in part, 

“revising the words “metric ton” the words “(453,600 mg/lb)” in 

the definition of the term “K” to read “(7,000 gr/lb).” . . . ” 

could not be incorporated because of inaccurate amendatory 

language.

§ 60.245 Recordkeeping.

Any facility under § 60.240(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 
Page 8 of 8

identified as specified in § 60.7(f) and in paragraphs (a) and 

(b) of this section. All records required by this subpart must 

be maintained onsite 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 drop established in § 

60.243(e)(3).

(2) A deviation occurs when the monitoring data are not 

available for at least 75 percent of the operating hours in a 

day.