Table 1 Industry Summary

Industry: Rubber processing Total number of subcategories: 11 Number of subcategories studied: 3a Number of dischargers in industry:

aWet digestion, although not a paragraph 8 exclusion, was not studied because of the lack of plant-specific data. Emulsion and solution crumb rubber, although candidates for exclusion, were studied, because data were available Source: USEPA.

The rubber processing industry is divided into 11 subcategories based on raw waste loads as a function of production levels, presence of the same or similar toxic pollutants resulting from similar manufacturing operations, the nature of the wastewater discharges, frequency and volume of discharges, and whether the discharge is composed of contact or noncontact wastewater. Other primary considerations are treatment facilities and plant size, age, and location. The 11 subcategories are listed below. A brief description of each subcategory follows.

• Subcategory 1: Tire and Inner Tube Manufacturing;

• Subcategory 2: Emulsion Crumb Rubber Production;

• Subcategory 3: Solution Crumb Rubber Production;

• Subcategory 4: Latex Rubber Production;

• Subcategory 5: Small-Sized General Molding, Extruding, and Fabricating Rubber

Plants;

• Subcategory 6: Medium-Sized General Molding, Extruding, and Fabricating Rubber

Plants;

• Subcategory 7: Large-Sized General Molding, Extruding, and Fabricating Rubber

Plants;

• Subcategory 8: Wet Digestion Reclaimed Rubber;

• Subcategory 9: Pan, Dry Digestion, and Mechanical Reclaimed Rubber;

• Subcategory 10: Latex-Dipped, Latex-Extruded, and Latex Molded Goods;

• Subcategory 11: Latex Foam.

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