The PRC SITE Team conducted sampling and analysis for the SITE demonstration of the Chemical Waste Management, Inc. (CWM) PO*WW*ER process at the Lake Charles Treatment Center in Carlyss, Louisiana. Samples were collected on September 24, 25, 26, 28, 29, and 30, 1992. During the first three days of sampling, the PO*WW*ER process operated with natural (unspiked) feed waste. For the last three days of sampling, the feed waste was spiked with sulfate salts of cadmium, copper, nickel, iron and mercury, and with phenol, toluene, tetrachloroethene, and methylene chloride. This report presents results and quality assurance/quality control (QA/QC) data for samples analyzed by Engineering-Science, Inc., along with vent gas emission rate and volumetric concentration results calculated from Ross analytical data. Analytical results are presented in Section 2.0. QA/QC results are presented in Section 3.0. Re-extraction and reanalysis results for brine samples are presented and discussed in Section 4.0. Appendix A contains chain of custody forms associated with the samples, and Appendix B contains a key to sample identification.