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' Population. Revised 1970 census data showed a population of San <br />Juan County, including Sivlerton, of 900 persons. The 1980 census <br />indicated a population of 825 persons, including Silverton. Of the <br />total county population, approximately 968 reside within the Town <br />' of Silverton. Population estimates used include summertim~_= <br />residents (property owners or other part-time residents) as well <br />as permanent residents. A change of only 75 persons is a good <br />' indicator that the permanent residency is relatively stable. <br />The impact of tourists can increase the summer transient or pass- <br />' through population by serveral thousand persons. However, since <br />this impact is caused by people who are normally in Town only a <br />few hours, they have not been included in the requirements of the <br />landfill. Their impact is registered through increased activity of <br />' businesses in Town, not through individual contributions of wastes. <br />Population projections for San Juan County are difficult t:o make due <br />' to the Historical decline in population up to 1970, then a gradual <br />increase to 1976, than a minor decline to 1980. At present the <br />population appears stable at between 800 and 900. we fee:L, however, <br />that an estimate of 1,025 persons in 10 years will be~•erva ive, <br />' which is slightly leBS-than was used in the 1976 Landfill Management <br />and Operation Plan. <br />Volume Re uirements. Volume requirements of a sanitary landfill are <br />a unction o the rate at which solid waste is generated and collected, <br />the degree of compaction, and the ratio of solid waste to cover material <br />The rate of solid waste generation is primarily a function of population <br />unless the site is also intended for industrial or agricultural solid <br />waste disposal. Since the only industry present in the County consists <br />of mining oriented enterprises, we do not anticipate any loading of <br />the site other than normal residential type solid wastes. <br />' According to an EPA publication*, in 1920 solid waste collected in <br />urban areas amounted to only 2.75 pounds per day per capita. In <br />1970, the collection rate was over five pounds and it was estimated <br />' that by 1980 it will reach eight pounds per day per capii.a. These <br />figures represent national averages for urban areas and :it is believed <br />that differences may exist in rural areas or in areas of different <br />' economic base. Although no data exists on which to make accurate <br />estimates of volume requirements, reasonable engineering judgement <br />suggests that from 4 to 6 pounds of solid waste per person per day <br />i ' will be collected in the service area for disposal at the proposed site. <br />Silverton/San Juan County does not have any means of weighing or <br />measuring the solid waste disposed of in the landfill. However, <br />' * Brunner an Ke er, Sanitary Lan i Design an Operation SW-65ts), <br />~ U.S. Environmental Protection Agency, 1972 <br />I <br />-8- <br />