2005 AGN MAR 15 I21 - Laserfiche WebLink

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City of Colton 3-5 Storm Drain Project Outline Project Description: The City has designed an innovative plan that realigns the 3-5 storm drain system. Phase I includes construction of parallel 108 -inch reinforced concrete pipe (RCP) across major transportation facilities, including the Union Pacific Railroad and Interstate 10. Upon completion, these flood control facilities will be bulkheaded and connect other facilities in later phases of the project. The City of Colton has awarded the design of Phases I — III to Engineering Resources of Southern California and construction for Phase I is scheduled to begin January 2006. The new alignment reduces the total cost of the project, avoids environmentally sensitive habitat, and provides for five (5) construction phases. Completion of phases I and II will make the storm drain system operational and will provide protection against flooding associated with a 25 -year event. Construction of Phase III will maintain the 25 -year level of flood protection achieved by construction of Phases I and II, while removing additional storm flows along Valley Boulevard and around Arrowhead. Finally, completion of Phases IV and V will bring the system to ultimate capacity, providing an outlet for 100 -year storm flows generated in San Bernardino County Project Areas 3-5 and 3-8 of Comprehensive Storm Drain Plan No. 3. The five phases of the proposed storm drain are: Phase I Construction Cost: $2,725,130 Phase I includes construction of a parallel 108 -inch reinforced concrete pipe (RCP) across major transportation facilities, including the Union Pacific Railroad and Interstate 10. Upon completion, these food control facilities will be bulkheaded and connect other facilities in later phases of the project. Phase II Construction Costs: $3,979,175 Phase II includes the construction of a 9 -foot by 8 -foot pre -cast reinforced concrete box between the parallel 108 -inch RCP under Interstate 10 and the Union Pacific Railroad and the existing 78 -inch RCP in Rancho Avenue at Agua Mansa Road. With completion of Phases I and II, the storm drain system becomes operational, and will provide protection against flooding associated with a 25 -year event. Phase III Construction Costs: $1,309,850 Phase III includes the extension of 108 -RCP west along Valley Boulevard between Cypress Avenue and Meridian Avenue. Construction of Phase III will maintain the 25 -year level of flood protection achieved by construction of Phases I and II, while removing additional storm flows along Valley Boulevard.