Feasibility and Reliability Criteria

Communities across the U.S. expect their local governments to provide reliable public services including wastewater collection and treatment continuously and cost efficiently. Continued high value wastewater collection service in Lake Oswego depends on having a well-maintained, reliable and adequately-sized wastewater collection system. Increasing service demands and aging infrastructure require increasing vigilance and sustained effort to keep your wastewater collection system functioning properly to protect public health and water quality. To ensure the best possible service in the decades to come for your public dollars, the City established criteria and selected the in-lake gravity, buoyant system because it best achieved the feasibility criteria.

Feasibility:

• Technical - A new LOIS system must correct the capacity and structural problems and be constructible;
• Cost - A new LOIS system must be constructible at a reasonable price with a minimum of risk for changes, delays and claims;
• Regulatory permits - A new LOIS system must be permitable by regulatory agencies;
• Public acceptance - A new LOIS system must have public support and acceptance.

Reliability Criteria:

• Longevity - A new LOIS system must have at least a 75-year expected service life;
• Dependability, Operations and Maintenance - A new LOIS system must have enough capacity to carry wet weather flows from the ultimate service area. It must be able to withstand a moderate earthquake with no damage and be repairable after a major earthquake. A new LOIS system must be dependable in both routine and extreme conditions and be safely and economically operated and maintained.