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I I I I I I I I I I I I I I I I I I I 1.3.4 Population Several recreation-oriented developments for both winter and summer surround Pagosa Springs. The largest being Fairfield/Pagosa, which lies to the west and includes a lodge, golf course, condominiums, and other amenities. The pristine nature of the Pagosa Springs area draws this type of development. The 1980 U.S. census reported a resident population of 1,331 people for Pagosa Springs. The area immediately adj acent to Pagosa Springs, including areas served by the Archuleta Water Company, increased the estimated total population of the service area to 2,110 (Davis Engineering Service, Inc., August 1982). The population for all of Archuleta County was 3,664 in 1980. County officials estimate the population of the county in 1984 at 5,900 people (Pagosa Springs Chamber of Commerce, 1984). 1.3.5 Existing Water Supply Currently the Town of Pagosa Springs receives water from the west fork of the San Juan River. The intake structure is located approximately 2 miles upstream of the Turkey Creek reservoir site. Existing treatment facilities include a water treatment plant, containing a gravity sand filter, a raw water reservoir, a storage tank, and an 11 mile water transmission line. The pipeline from the intake structure to the treatment plant was installed in 1971, using 16-inch transite, with some sections containing ductile iron pipe. Portions are above ground with the majority being underground. The transmission pipeline above the treatment plant has a design capacity of 2.5 millions gallons per day (mgd), but due to soil stability problems the capacity has been reduced to between 1.3 to 2.0 mgd. The transmission pipeline below the treatment plant has a design capacity of 4 mgd. The storage tank and raw water reservoir, located near the treatment plant, have capacities of 250,000 gallons and 8 million gallons, respectively. 1-3