This manual contains instructional worksheets for a course in basic laboratory skills. It has been designed to meet the needs of the treatment plant technician who has little or no previous laboratory experience and is required to monitor effluent discharges. The manual is prepared on a modular basis and includes basic mathematics, weighing techniques, use of equipment, solution preparation, and basic microbiological techniques. All handout sheets, pre- and post-tests, and quizzes are contained in the Appendix. (CS)