The quality assurance / quality control work plan for the Strawbridge Lake phase I diagnostic-feasibility study. The primary objectives of the study are:1. To evaluate existing water quality conditions in Strawbridge Lake and to determine their impacts on recreational uses of the lake and its surrounding area,2. To identify the sources and magnitude of pollutants entering Strawbridge Lake,3. To evaluate feasible control alternatives and restoration methods, and 4. To develop and recommend a conceptual lake and watershed management plan that is cost-effective, environmentally sound, acceptable to the public, and can be used as the basis for a Phase II Implementation Grant Application for submission to the EPA.