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Pleasanton is now served by two sewage treatment plants - the Sunol Sewage Treatment Plant, serving what is known as the Sunol service area, and the Dublin-San, Ramon Services District (DSRSD) Sewage Treatment Plant, serving an area both within and outside of Pleasanton known as the DSRSD service area. The Sunol Sewage Treatment Plant is planned to be phased out of operation, with an expanded DSRSD Sewage Treatment Plant treating the effluent from both service areas. Although the DSRSD Sewage Treatment Plant is planned to treat all the city's effluent, the total capacity of that plant will be appor- tioned into "reserves," with a certain amount of capacity roughly reserved for the DSRSD service area north of I-580 (outside Pleasanton), for the DSRSD service area south of I-580 (largely within Pleasanton), and for the Sunol service area. The two reserves available for Pleasanton's future development ensure that growth - residential, commercial, and industrial - can take place in all sectors of the city for the next 20-year period, with growth in neither sector coming at the expense of growth in the other. Policy 6: To maintain a reserve of sewage treatment and disposal capacity for both the Sunol and DSRSD service areas within the consolidated DSRSD Sewage Treatment Plant. - Residential Growth Rate - In order to attempt to meet the federal air quality standards, residential growth must be limited (see Environmental Element). The 76,000 population holding capacity at ultimate development will be reached slowly, allowing technological progress to reduce vehicular emissions and those of stationary sources while at the same time limiting the number of persons located in the polluted air basin. Sewerage facilities, necessary to accom- modate new urban growth, are anticipated to be expanded in two ten- year phases: first to accommodate roughly 43,300 persons by 1986, then to accommodate 48,700 persons by 1996. Growth beyond 1996 is too speculative and distant to be of concern. The projected popu- lations are based on a "E-Zero" growth rate, roughly two percent per year. Policy 7: To recognize as benchmarks the populations of approximately 43,300 for 1986 and 48,700 for 1996 and to acknowledge a holding capacity of approximately 76,000 persons in the planning area at ultimate development. -6 -