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Table 7. Estimated Replacement Value of Regional Wastewater System <br />Estimated <br />Replacement <br />Facility Quantity Value ($ Millions) <br />Pipelines <br />600 miles 3,000 <br />Joint Interceptor <br />10 miles 400 <br />Lift Stations <br />60 300 <br />Meter Stations <br />200 100 <br />Metropolitan Plant <br />1 1,200 <br />Regional Plants <br />7 1,000 <br />Total System 6,000 <br />Environmental Sustainability <br />Sustainability of the regional wastewater system includes: (1) water sustainability; (2) energy <br />conservation and generation; (3) air emissions reduction; and (4) solid waste reuse and <br />reduction. <br />Water Sustainability. The Council has two interrelated objectives: (1) sustaining the region's <br />water resources to provide water supply and water quality that supports the region's economic <br />growth and quality of life; and (2) investing the region's financial and technical resources to <br />maximize benefits. Water supply, stormwater treatment and reuse, and wastewater treatment <br />and reuse should be part of an integrated system that is optimized to meet these regional <br />objectives. <br />Wastewater reuse has the potential to meet part of the region's water supply needs. Investing <br />strategically to further the region's nonpoint source pollution prevention and control program's <br />effectiveness also may have more benefits than investing to meet more stringent wastewater <br />discharge limits. <br />The Council's program for mitigating infiltration and inflow in public and private wastewater <br />collection systems also contributes to water sustainability by avoiding water quality risks, and <br />limiting the amount of clear water entering the system, which is then lost to the region when <br />treated and discharged to rivers. Reducing infiltration and inflow also recovers system capacity, <br />which improves efficiency. <br />Solid Waste. The wastewater system plan continues to support the use of wastewater <br />treatment biosolids for energy generation for in -plant uses. The Metropolitan Plant uses thermal <br />processing that reduces the biosolids to a small volume of inert ash, while recovering energy <br />that is converted to electricity and steam for in -plant uses. The beneficial use of ash for its value <br />as a phosphorus fertilizer is also being pursued. The Blue Lake and Empire plants use <br />41 <br />