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Sampling and testing procedures utilized by the Orange County Pollution Control Department in collecting and analyzing water and sediment samples during the baseline data collection period of the Large-Scale Operations Management Test at Lake Conway, Fla., are documented in this report. Water quality data obtainaed during the baseline period, January 1976 - August 1977, are compiled for each of the 12 sampling stations. Mean values and standard deviations are included for all of the relevant parameters. An analysis of water quality data showed little variability within each lake pool but indicated variations between the pools. Several water quality indicators were consistently lower in the South and Middle pools of Lake Conway. An increase in biochemical oxygen demand, chemical oxygen demand, solids, and nutrients occurred in the East and West pools of the system and a further increase in nutrients, solids, and chlorophyll concentrations was noted in Lake Gatlin. In general, phytoplankton productivity levels were low throughout the Lake Conway system. Nutrient levels were also low, correlating well with the low plankton productivity. Future comparisons should give particular attention to assessing any changes in nutrient and productivity levels and community succession.