(a) Generators who use analytical methods to classify their waste must use methods described in "Test Methods for the Evaluation of Solid Waste, Physical/Chemical Methods" (EPA SW-846), "Methods for Chemical Analysis of Water and Wastes" (EPA-600/4-79/020), "Standard Methods for the Examination of Water and Wastewater", American Society for Testing and Materials (ASTM) Standard Methods, or any other approved EPA methods or may request in writing that the executive director review and approve an alternate method. The generator must also choose representative sample(s) of their waste, as described in Chapter 9 of EPA SW-846. A generator who proposes to use an alternate method must validate the alternate method by demonstrating that the method is equal to or superior in accuracy, precision, and sensitivity to the corresponding SW-846, EPA-600, Standard Method or ASTM method identified in this subsection.     
      (b) The generator proposing an alternate method shall provide the executive director with the following information:      
        (1) a full description of the proposed method including all equipment used;       
        (2) a description of the types of wastes and waste matrices analyzed or to be analyzed;       
        (3) comparative quality assurance results of the proposed method and the corresponding SW-846 method;       
        (4) a complete assessment of any factors which may interfere with the method; and       
        (5) a description of the Quality Control procedures necessary to ensure the sensitivity, accuracy, and precision of the proposed method.       
      (c) Upon request of the executive director, the generator shall provide additional information as necessary to enable the executive director to adequately review the alternate methods proposed by the generator.     
     Source Note:        The provisions of this §335.509 adopted to be effective November 27, 1992, 17 TexReg 8010; amended to be effective February 24, 1994, 19 TexReg 1042; amended to be effective May 30, 1995, 20 TexReg 3722; amended to be effective November 15, 2001, 26 TexReg 9135