2003 AGN AUG 19 I17 - Laserfiche WebLink

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Item #17 CITY OF COLTON AGENDA REPORT FOR THE CITY COUNCIL MEETING OF AUGUST 19, 2003 TO: HONORABLE MAYOR AND CITY COUNCIL MEMBERS FROM: AMER JAKHER, P.E., CITY ENGINEER 0) SUBJECT: AUTHORIZATION REQUEST TO CONTRACT FOR COMPREHENSIVE STORM DRAIN PLAN NO. 3 PROJECT 3-5, PROJECT DEVELOPMENT AND PRELIMINARY ENGINEERING AND APPROVE THE AUTHORIZING RESOLUTION. DATE: AUGUST 11, 2003 BACKGROUND: In 1986 the Cities of Colton and San Bernardino and the San Bernardino County Flood Control District entered into an agreement to review alternatives, and develop a drainage plan, to remedy drainage concerns in the westerly portion of Colton. The East Rialto Channel, and the Pepper, Mill and Randall Basins, located to the north have been evaluated and found not to be adequate to contain major storm flows. In addition to this, there is no outlet Basin or drainage facilities to conduct storm water flows south, under Interstate 10 and under the Southern Pacific Railroad tracks to the Santa Ana River. The existing facilitates provide little or no mitigation from flooding that occurs on the westerly most portion of the community. In 1973 a conceptual plan was developed, identifying improvements that will provide the channeling system necessary to eliminate area flooding by providing collection systems and a conduit to the Santa Ana River. The Comprehensive Storm Drain Plan 3-5 (CSDP 3-5) encompass approximately 940 acres of tributary area within the jurisdictions San Bernardino City, Rialto, Colton and unincorporated areas within San Bernardino County. The aforementioned jurisdictions funded an engineer's report, prepared by the County Flood Control District and adopted by the County Board of Supervisors in March 1991 to evaluate alternatives for the project. The engineer's report evaluated several different alignments including retention basins, subsurface storm drains and open channels. The recommended alternative was to provide modifications to existing detention basins and to construct a concrete trapezoidal channel and pipe storm drains ranging from 42" to 120 inches in diameter.