Laserfiche WebLink
4. Alternatives <br />All projections are based on the measurement and pricing of quantities where possible. <br />Where measurement was not possible, reasonable allowances have been made to cover the <br />probable scope of work. It is recommended that the City examine any allowances in order <br />to confirm that the assumed scope is appropriate. Items with a lump sum (LS) are generally <br />allowances. <br />While the information contained herein is based on professional judgment made by team <br />members familiar with the construction industry working closely with the staff of the City <br />of San Leandro, a myriad of outside factors may affect any construction cost projections. <br />These include, but are not limited to: fluctuating materials costs; the status of the economy; <br />number of bidders; and permitting and monitoring complexities. Should the City pursue <br />any of these alternatives in while or in part, there is no guarantee that the amounts <br />indicated, should the City pursue any of the alternatives in whole or in part, will not vary <br />from that specified in this opinion of probable costs. <br />Dredging Costs Applicable to the Marina Park Alternative <br />Table 4-6 presents approximate costs for dredging the Harbor Basin and the Channel from the <br />Wes McClure Boat Launch to the 1 -mile point from the harbor. <br />Dredging costs shown are, typically, given on a per cycle basis including initial costs and <br />recurring costs are every 4 years. <br />TABLE 4-6 <br />DREDGING ALTERNATIVES AND COSTS <br />Notes and Assumptions <br />a Close-out DMMS site and restore to marsh at end of Year 0 <br />b Close-out both refugia islands at end of Year 8 <br />c The Marina berthing area has not been dredged since 1997, this area will require additional dredging over that which would be required <br />in future 8 -year cycles, for a total of 125,000 CY. <br />d <br />So Basin and No Basin costs include an allowance for containment dikes to make the basin capable of holding dredged material. <br />San Leandro Marina Harbor Basin 4-19 ESA / 210461 <br />Alternatives Study March 2011 <br />Disposal Location & Quantity (CY) <br />Other <br />Volume <br />Costs Per <br />Year <br />(CY) <br />DMMS <br />So Basin° <br />No Basind <br />In -Bay <br />Episode <br />0a,o <br />125,000 <br />60,000 <br />65,000 <br />$ 3,764,640 <br />4 <br />105,000 <br />105,000 <br />$ 3,373,425 <br />8b <br />115,000 <br />91,000 <br />24,000 <br />$ 2,249,170 <br />12 <br />105,000 <br />105,000 <br />$ 2,985,675 <br />16 <br />115,000 <br />115,000 <br />$ 3,270,025 <br />20 <br />105,000 <br />105,000 <br />$ 2,985,675 <br />Annualized Dredging Costs Over 20 Years <br />$ 931,431 <br />Notes and Assumptions <br />a Close-out DMMS site and restore to marsh at end of Year 0 <br />b Close-out both refugia islands at end of Year 8 <br />c The Marina berthing area has not been dredged since 1997, this area will require additional dredging over that which would be required <br />in future 8 -year cycles, for a total of 125,000 CY. <br />d <br />So Basin and No Basin costs include an allowance for containment dikes to make the basin capable of holding dredged material. <br />San Leandro Marina Harbor Basin 4-19 ESA / 210461 <br />Alternatives Study March 2011 <br />