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Guidelines for an alternative method as equivalent to EPA 8040 - Phemis by OC 1 . The laboratory must document that the detection limit using the alternative methods is equivalent to or better than the instrumentation specified in SW-846, Method 8040. The laboratory can demonstrate that the alternative method is equivalent by running all compounds listed in Method 8040 an both instruments in both soil and water matrices. 2. The laboratory must state any observed interferences or any interferences anticipated based on using the proposed procedure. 3. List operating parameters of instruments as well as Chromatography columns. 4. Describe, in detail, the step-by-step procedure for preparing instrument calibration standards to include proper storage and shelf life. Indicate concentrations of calibration standards. 5. Describe, in detail, the step-by-step procedure for preparing spiked samples. 6. Laboratory must document the accuracy and precision of the alternative method are equivalent to instrumentation specified in SW-846, Method 8040. The laboratory must run three levels, one each at a low, mid-range, and high concentration, in duplicate for four days, for three different compounds chosen to give early, medium, and late retention times, in two different matrices, i.e., water and soil. The laboratory must submit all raw data including standard calibration for both instruments. 7. The laboratory must tabulate the data and determine the relative percent difference between the daily duplicates for each matrix, compound, and each target concentration for both the alternative method and the equivalent instrumentation specified in SW-846, Method 8040 using the format on Table is and ib. Next, the laboratory must tabulate the average found concentration and % recovery for each concentration, for each matrix and for each instrument using the format on Table 2. Finally, the laboratory must tabulate the overall precision - the average found value, standard deviation (SD) and coefficient of variation (CV) for each compound, at each concentration, for each matrix, and for each instrument using the format on Table 3.