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. from communities outside the Denver metro area. These "water quality limited" segment designations are based principally on discharges from point sources such as municipal and industrial discharges. Many of these streams also have problems with high levels of dissolved solids which are primarily caused by nonpoint sources such as irrigation return flows. A complete analysis of the water quality problems that are not addressed in existing or ongoing planning activities is included in Appendix C. Information contained in that appendix serves as support data for the water quality elements defined for this study in a later section. The following section presents recently com- pleted or ongoing water quality planning activities that have a direct effect on this study. STATUS OF PLANNING ACTIVITIES The majority of comprehensive water quality planning activities are the result of Federal legislation requiring that certain planning activities be undertaken in order that communities may receive Federal grants for the construction of wastewater treatment facilities. Prior to the passage of the Water Pollution Control Act Amendments of 1972, known as PL 92-500, the 3-C plan was the most common areawide plan. It was authorized under section 3-C of the 1970 Water Pollution Control Plan. Communities voluntarily applied for funds to prepare 3-C plans. Once authorized, grant applications had to be in agree- ment with the approved 3-C plan to receive approval. With the pass- age of PL 92-500, a series of plans were authorized which varied according to the size and type of the study area. The plans are as follows: . 17