Evaluation of Groundwater Supply Alternatives Within Bernal Subbasin

EVALUATION OF GROUNDWATER SUPPLY ALTERNATIVES WITHIN BERNAL SUBBASIN APRIL 2026 / FINAL / CAROLLO CITY OF PLEASANTON 18 Table 7 Evaluation Criteria Scoring Definitions Score Water Supply Reliability Water Quality Reliability Ease of Expansion for Treatment Community and Environmental Impacts Implementation Schedule 5  The alternative can deliver greater than 3,500 AFY and can exceed the max day supply of 4,400 gpm for both existing and future conditions. Exceeding these goals provides additional benefits to the City.  Greatly improves system reliability during drought conditions, redundancy for short-term facility outages (planned and unplanned), ability to mitigate impacts of emergency outages occurring at the regional supply level and reduces risk of low supply pressures at turnouts.  The alternative can deliver water quality at or below current regulatory requirements.  The alternative allows maximum flexibility in source blending and locational delivery to aid in the City's management of water quality within the distribution season based on seasonal changes.  Future treatment occurs at a regional level.  Minimal risk to availability of space, ease to permit, ability to operate and cost.  The alternative has minimal impacts to community and environment during construction.  The alternative has minimal long-term impacts to parks / City property use, nearby residents, and the environment.  The implementation schedule for this alternative is minimal (2 years or less).   Minimal potential for schedule delays with low impacts to City. 3  The alternative delivers 3,500 AFY and a maximum day supply of 4,400 gpm for both existing and future conditions.  Moderately improves system reliability during drought conditions, redundancy for short-term facility outages (planned and unplanned), ability to mitigate impacts of emergency outages occurring at the regional supply level and reduces risk of low supply pressures at turnouts.  The alternative allows moderate flexibility in source blending and locational delivery to aid in the City's management of water quality within the distribution season based on seasonal changes.  Future treatment occurs at project site(s).  Moderate risk to availability of space, ease to permit, ability to operate and cost.  The alternative has moderate impacts to community and environment during construction.  The alternative has moderate long-term impacts to parks / City property use, nearby residents, and the environment.  The implementation schedule for this alternative is moderate (3 years).  Moderate potential for schedule delays with moderate impacts to City. 1  The alternative cannot guarantee to deliver 3.500 AFY and the maximum day supply of 4,400 gpm for both existing and future conditions.  Does not improve reliability during drought conditions, redundancy for short-term facility outages (planned and unplanned), ability to mitigate impacts of emergency outages occurring at the regional supply level and reduces risk of low supply pressures at turnouts.  The alternative allows minimal flexibility in source blending and locational delivery to aid in the City's management of water quality within the distribution season based on seasonal changes.  Future treatment occurs off project site(s).  High risk to availability of space, ease to permit, ability to operate and cost.  The alternative has significant impacts to community and environment during construction.  The alternative has significant long-term impacts to parks / City property use, nearby residents, and the environment.  The implementation schedule for this alternative is lengthy (4 years and greater).  High potential for schedule delays with high impacts to City.