TABLE 51 continued

Guide To Creating Spa Products

Guide To Creating Spa Products

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Core

Homogenizing Artificial aging Cleaning or etching

Subcategory 3: Extrusion Extrusion die cleaning Extrusion dummy block cooling Degassing Stationary casting Artificial aging Annealing Degreasing Cleaning or etching

Subcategory 4: Forging Artificial aging Annealing Degreasing Cleaning or etching Sawing

Subcategory 5: Drawing with Neat Oils Drawing with neat oils Continuous rod casting Stationary casting Artificial aging Annealing Degreasing Cleaning or etching Sawing Stamping Swaging

Subcategory 6: Drawing with Emulsions or Soaps Drawing with emulsions or soaps Continuous sheet casting Stationary casting Artificial aging Annealing Degreasing Cleaning or etching

Source: U.S. EPA, Development Document for Effluent Limitations Guidelines and Standards for the Aluminum Forming Point Source Category, Vols. 1 & 2, U.S. EPA, Washington, DC, 1984; U.S. EPA, Aluminum Forming Point Source Category, available at http:// www.access.gpo.gov/nara/cfr/waisidx_03/40cfr467_03.html, 2008.

Direct chill or continuous rod casting Press and solution heat treatment Cleaning or etching Extrusion die cleaning Annealing

Forging

Solution heat treatment Cleaning or etching

Continuous rod casting Solution heat treatment Cleaning or etching

Continuous rod casting Solution heat treatment Cleaning or etching

5.2.1 Rolling with Neat Oils

This subcategory is applicable to all wastewater discharges resulting from or associated with aluminum rolling operations in which neat oils are used as a lubricant. The rolling with neat oils subcategory consists of approximately 45 plants, 22 of which use only this process. Half of the plants (23 of 45) associated with this subcategory were also associated with one or more additional subcategories.

5.2.2 Rolling with Emulsions

This subcategory is applicable to all wastewater discharges resulting from or associated with aluminum rolling operations in which oil-in-water emulsions are used as lubricants. The rolling with emulsions subcategory consists of approximately 23 plants, of which only one uses this process exclusively. Thus, 96% of the plants in this subcategory were also included in one or more other subcategories.

5.2.3 Extrusion

All wastewater discharges resulting from or associated with extrusion are applicable to this sub-category. The extrusion subcategory consists of approximately 157 plants, more than in any other subcategory. Of these plants, 140 use the extrusion process exclusively. Although most of the plants in this subcategory (89%) are not associated with any other subcategories, some overlap does occur.

5.2.4 Forging

This subcategory is applicable to all wastewater discharges resulting from or associated with forging of aluminum or aluminum alloy products. The forging subcategory consists of approximately 15 plants, 12 of which use only this process. Thus, only 20% of the plants have operations that overlap with one or more other subcategories.

5.2.5 Drawing with Neat Oils

All wastewater discharges resulting from or associated with drawing operations that use neat oil lubricants are applicable to this subcategory. Fifty of the sixty-two plants that comprise the drawing with neat oils subcategory use this process exclusively. The remaining 12 plants in this subcategory were also associated with one or more additional subcategories.

5.2.6 Drawing with Emulsions or Soaps

This subcategory is applicable to all wastewater discharges resulting from or associated with the drawing of aluminum products using oil-in-water emulsion or soap solution lubricants. Eight of the eleven plants that comprise this subcategory use the drawing with emulsions or soaps process exclusively. Overlap with other subcategories occurs at the remaining three plants.

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