The objective of this report is to evaluate the use of Coarse Gold Creek as a back-up source for a domestic water supply for the Yosemite Lakes Park Subdivision.  Secondary objectives are to evaluate means by which water can be conserved so that withdrawal from the aquifer will be a minimum, and to provide preliminary design information on the proposed water treatment facilities for review by the Public Health Department before detail design is completed.  The report includes an evaluation of the water quality of Coarse Gold Creek watershed.