(a) Identification of sources. The plan includes the following sulfuric acid production plants:

(1) Diamond-Shamrock Corporation in Sunray, Texas.

(2) Amoco Oil Company in Texas City, Texas.

(3) E.I. duPont de Nemours & Company, Inc. in La Porte, Texas.

(4) Mobil Mining and Minerals in Pasadena, Texas.

(5) Rohm and Haas, Texas Inc. in Deer Park, Texas.

(6) Stauffer Chemical Company in Baytown, Texas.

(7) Stauffer Chemical Company in Houston, Texas.

(8) Olin Corporation in Beaumont, Texas.

(9) Stauffer Chemical Company in Pasadena, Texas.

(10) Stauffer Chemical Company in Fort Worth, Texas.