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Replacement Costs <br />The final component of the study was to estimate the construction costs to implement both turf <br />replacement scenarios. Unit costs were developed based on current bid climate prices for similar <br />work. For each site, unit costs were applied to the square footage to determine total costs for <br />conversion, whether it be to mulch or to drought-tolerant planting. For scenario A, the applicable <br />items of work included contractor bonding and mobilization, stripping sod, finish grading, mulch, <br />extension of laterals to irrigate existing trees with bubblers and a design contingency to cover <br />unknown costs. For scenario B, the applicable items of work included all the line items noted in <br />Scenario A plus soil preparation, irrigation modifications and planting to account for the added work <br />required to install drought-tolerant planting. The cost to implement converting to mulch at all sites <br />(Scenario A), totals approximately $8.6M. The cost to implement converting to drought-tolerant <br />planting at all sites (Scenario B), totals approximately $15.3M. <br />Both scenarios require the need for irrigation. Additional cost to consider include irrigation <br />modification and the ongoing cost of water. Conversion areas were defined by reviewing irrigation <br />drawings for City parks and identifying irrigation valves that could either be removed completely <br />or valves that only require minor modifications. In scenario A, the cost to implement irrigation <br />modification results in an additional $15.00 per linear foot to account for new bubblers and lateral <br />line extensions. This assumes reusing existing valves (i.e., no new control wires) and laterals. In Scenario <br />B, the cost to implement irrigation modifications results in an additional $1.00 per square foot. It also <br />assumes reusing existing valves (i.e., no new control wires) and laterals. Rotors will be replaced with <br />rotary spray or bubblers and supplementing with new laterals as needed. <br />Admittedly, the cost for water is significantly reduced in both scenarios compared to current <br />conditions. Per City staff, potable irrigation water costs $6.50 per CCF (or 748 gallons). When applied <br />to the water use required, annual water costs at 2024 rates can be calculated as follows: <br />Scenario A <br />223,423 gallons per year / 748 gallons per CCF = 300 CCF per year <br />300 CCF per year x $6.50/CCF = $1,950 per year <br />Scenario B <br />13,369,967 gallons per year / 748 gallons per CCF = 17,875 CCF per year <br />17,875 CCF per year x $6.50/CCF = $116,188 per year <br />CITYWIDE TURF REDUCTION STUDY <br />8 / 47 CITY OF PLEASANTON © Copyrighted 2024 Callander Associates <br /> Landscape Architecture, Inc. <br /> REPLACEMENT COSTS METHODOLOGY <br />Page 16 of 58