Laserfiche WebLink
REGIONAL GROUNDWATER FACILITIES PROJECT <br />FEASIBILITY STUDY <br /> <br /> 21 Zone 7 Water Agency <br />December, 2025 <br /> <br />a Blue points represent annual O&M costs ($/AF) at each alternative’s maximum feasible production (≤7,000 AFY during drought <br />conditions) under Zone 7’s 75% reliability limit (18 hr/day); capital (annualized) costs are excluded. <br />b Green points represent total annualized costs ($/AF), including both O&M and capital (annualized) costs, at each alternative’s <br />maximum feasible production (≤7,000 AFY during drought conditions) under Zone 7’s 75% reliability limit (18 hr/day). <br />c Capital recovery factor was calculated assuming a 50-year facility life and 3% discount rate. <br />d O&M cost categories include staffing, chemicals, power, well rehabilitation, pump repair/replacement, and <br />electrical/instrumentation maintenance. See Appendix I for details and unit cost / quantity assumptions. <br />e Costs are presented in 2025 dollars. Refined cost for Alternative 2 is provided with the BODR in Appendix J and will be further <br />refined as the project advances to Phase II design if agreement is reached between Zone 7 and the City <br />f Costs for Alternatives 1 and 3 are presented for informational purposes only, as these alternatives cannot meet Zone 7’s <br />drought year production target under the agency’s maximum allowable 75% runtime and have accordingly been eliminated <br />from consideration. <br /> <br />As shown in Figure 9, O&M-only costs (blue) range from approximately $403/AF to $440/AF, while <br />annualized costs that incorporate capital recovery (green) range from $559/AF to $724/AF, depending on <br />the project alternative. <br />3.4.3. Cost Summary <br />A summary of estimated capital costs, annual O&M costs, and total annualized costs for each project <br />alternative is provided in Table 5. <br />Table 5. Project Alternative Cost Estimates (Class 5) <br />Cost Category <br />Project <br />Alternative #1 <br />(Tennis Park)d <br />Project <br />Alternative #2 <br />(Tennis and <br />Hansen Parks) <br />Project <br />Alternative #3 <br />(Tennis and Del <br />Prado Parks)d <br />Project <br />Alternative #4 <br />(Tennis, Hansen <br />and Del Prado <br />Parks) <br />Capital Costsa $16.6M <br />($8.9M - $19.1M) <br />$33.9M <br />($18.3M - $39.2M) <br />$33.2M <br />($17.9M - $38.3M) <br />$51.1M <br />($27.5M - $58.9M) <br />Annual O&M Costs <br />($/AF)b $403 $418 $416 $440 <br />Annualized Capital <br />Costs ($/AF)c $157 $188 $227 $283 <br />Total Annual Costs <br />($/AF) $559 $607 $643 $724 <br />Total Annual Costs <br />($/yr) $2,300,583 $4,246,178 $3,656,449 $5,065,094 <br />a Discrete capital cost totals for each project alternative are AACE Class 5 order-of-magnitude estimates with an accuracy range <br />of −30% to +50% on construction costs and includes estimated 30% soft costs. <br />b Annual O&M costs ($/AF) at each alternative’s maximum feasible production (≤7,000 AFY during drought conditions) under <br />Zone 7’s 75% reliability limit (18 hr/day). <br />c EUAC of estimated project capital costs assuming a 50-year facility life and 3% discount rate. <br />d Costs for Alternatives 1 and 3 are presented for informational purposes only, as these alternatives cannot meet Zone 7’s <br />drought year production target under the agency’s maximum allowable 75% runtime and have accordingly been eliminated <br />from consideration. <br />