07-26-2021 BPU RPT 05 - Laserfiche WebLink

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W A T E R E N E R G Y L I F E RIVERSIDE PUBLIC UTILITIES • ' Board Memorandum P U B L I C U T I L I T I E S BOARD OF PUBLIC UTILITIES DATE: JULY 26, 2021 SUBJECT: CONSTRUCTION OF THE GRATTON STREET TEMPORARY HIGHLINES AND WATER MAIN RELOCATION PROJECT — 90 FEET OF NEW POTABLE WATER PIPELINE - WORK ORDER NO. 2123552 FOR $109,000 — REIMBURSEMENT OF UP TO $54,500 FROM PUBLIC WORKS ISSUE: Consider approving the expenditure of $109,000 for Work Order No. 2123552, which includes all construction, paving and construction contingency costs for the Gratton Street Temporary Highlines and Water Main Relocation Project with a reimbursement of 50% of the total work order expenditure, up to $54,500, from Public Works for their share of the water main relocation costs. RECOMMENDATION: That the Board of Public Utilities approve the expenditure of $109,000 for Work Order No. 2123552, which includes all construction, paving and construction contingency costs for the Gratton Street Temporary Highlines and Water Main Relocation Project with a reimbursement of 50% of the total work order expenditure, up to $54,500, from Public Works for their share of the water main relocation costs. BACKGROUND: The Public Works Department (Public Works) will be constructing approximately 2.12 miles of 12 - inch to 78 -inch storm drain pipes and ancillary structures in the Arlington Greenbelt Area as part of their Monroe Master Drainage Plan Line E Stages 2 and 3, Line E-2 and Line E-5 Storm Drain Project to alleviate flooding concerns. Many of these properties are in or near agricultural zones and are surrounded by large parcels and landscaping businesses which, during rain events, may be impacted by significant water sheet flow. During heavy or prolonged rain events, the soil becomes saturated and excess water can flood homes, businesses, roadway facilities, and can undermine the existing utilities located beneath the roadbed. Storm drains are a critical component of a roadway network as they help collect, convey, remove, and dispose of surface water runoff to provide safe travel lanes and protect roadway facilities and surrounding properties. On June 8, 2021, the City Council approved the award of Bid No. 7718 to construct this project. A segment of 72 -inch storm drain pipe and its associated catch basins and system connections is proposed to be installed within Gratton Avenue which will be in conflict with an existing 8 -inch Riverside Public Utilities (RPU) water main running parallel to the proposed storm drain alignment at the intersection of Gratton Street and Dufferin Avenue. Due to the limited separation distance