40 CFR 421.292: Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.

Except as provided in 40 CFR 125.30 through 125.32, any existing point source subject to this subpart shall achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable technology currently available:

(a) Tin smelter SO2 scrubber.

BPT Limitations for the Secondary Tin Subcategory

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/kg (pounds per million pounds) of crude tapped tin metal produced

Arsenic 19.220 8.554

Lead 3.863 1.840

Iron 11.040 5.611

Tin 3.495 2.024

Total suspended solids 377.100 179.400

pH (1) (1)

1 Within the range of 7.5 to 10.0 at all times.

(b) Dealuminizing rinse.

BPT Limitations for the Secondary Tin Subcategory

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/kg (pounds per million pounds) of dealuminized scrap produced

Lead 0.015 0.007

Cyanide (total) 0.010 0.004

Fluoride 1.225 0.700

Tin 0.013 0.008

Total suspended solids 1.435 0.683

pH (1) (1)

1 Within the range of 7.5 to 10.0 at all times.

(c) Tin mud acid neutralization filtrate.

BPT Limitations for the Secondary Tin Subcategory

Pollutant or pollutant property Minimum for any 1 day Maximum for monthly average

mg/kg (pounds per million pounds) of neutralized, dewatered tin mud produced

Lead 2.120 1.009

Cyanide (total) 1.464 0.606

Fluoride 176.600 100.400

Tin 1.918 1.110

Total suspended solids 206.900 98.420

pH (1) (1)

1 Within the range of 7.5 to 10.0 at all times.

(d) Tin hydroxide wash.

BPT Limitations for the Secondary Tin Subcategory

Pollutant or pollutant property Minimum for any 1 day Maximum for monthly average

mg/kg (pounds per million pounds) of tin hydroxide washed

Lead 5.020 2.391

Cyanide (total) 3.466 1.434

Fluoride 418.400 237.900

Tin 4.542 2.630

Total suspended solids 490.100 233.100

pH (1) (1)

1 Within the range of 7.5 to 10.0 at all times.

(e) Spent electrowinning solution from new scrap.

BPT Limitations for the Secondary Tin Subcategory

Pollutant or pollutant property Minimum for any 1 day Maximum for monthly average

mg/kg (pounds per million pounds) of cathode tin produced

Lead 7.056 3.360

Cyanide (total) 4.872 2.016

Fluoride 588.000 334.300

Tin 6.384 3.696

Total suspended solids 688.800 327.600

pH (1) (1)

1 Within the range of 7.5 to 10.0 at all times.

(f) Spent electrowinning solution from municipal solid waste.

BPT Limitations for the Secondary Tin Subcategory

Pollutant or pollutant property Minimum for any 1 day Maximum for monthly average

mg/kg (pounds per million pounds) of MSW scrap used as raw material

Lead 0.050 0.024

Cyanide (total) 0.035 0.014

Fluoride 4.165 2.368

Tin 0.045 0.026

Total suspended solids 4.879 2.321

pH (1) (1)

1 Within the range of 7.5 to 10.0 at all times.

(g) Tin hydroxide supernatant from scrap.

BPT Limitations for the Secondary Tin Subcategory

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/kg (pounds per million pounds) of tin metal recovered from scrap

Lead 23.370 11.130

Cyanide (total) 16.140 6.677

Fluoride 1,947.000 1,107.000

Tin 21.140 12.240

Total suspended solids 2,281.000 1,085.000

pH (1) (1)

1 Within the range of 7.5 to 10.0 at all times.

(h) Tin hydroxide supernatant from plating solutions and sludges.

BPT Limitations for the Secondary Tin Subcategory

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/kg (pounds per million pounds) of tin metal recovered from plating solutions and sludges

Lead 48.30 23.00

Cyanide (total) 33.35 13.80

Fluoride 4,025.00 2,289.00

Tin 43.70 25.30

Total suspended solids 4,715.00 2,243.00

pH (1) (1)

1 Within the range of 7.5 to 10.0 at all times.

(i) Tin hydroxide filtrate.

BPT Limitations for the Secondary Tin Subcategory

Pollutant or pollutant property Maximum for any 1 day Maximum for monthly average

mg/kg (pounds per million pounds) of tin metal produced

Lead 10.520 5.009

Cyanide (total) 7.263 3.005

Fluoride 876.500 498.400

Tin 9.517 5.510

Total suspended solids 1,027.000 488.400

pH (1) (1)

1 Within the range of 7.5 to 10.0 at all times.