10-28-2019 BPU RPT 11 - Laserfiche WebLink

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W A T E R E N E R G Y T I F F RIVERSIDE PUBLIC UTILITIES id& Board Memorandum P U B L I C U T I L I T I E S BOARD OF PUBLIC UTILITIES DATE: OCTOBER 28, 2019 ITEM NO: 11 SUBJECT: GAGE 46-1 WATER TREATMENT PLANT MODIFICATION PROJECT AND DEVLOPMENT OF LONG TERM WATER TREATMENT APPROACHES — WORK ORDER NO. 2008392 IN THE TOTAL AMOUNT $850,000 ISSUES: Approve Work Order No. 2008392 in the total amount of $850,000 for design, construction, and construction contingency costs for the Gage 46-1 Water Treatment Plant Modification Project; and authorize staff to use the Consultant's Panel to seek a progessional services agreement to investigate and develop long-term water treatment and operational approaches to reduce concentrations of chemical substances known as perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS) for a not to exceed amount of $150,000. RECOMMENDATIONS: That the Board of Public Utilities: 1. Approve Work Order No. 2008392 in the total amount of $850,000 for design, construction, and construction contingency costs for the Gage 46-1 Water Treatment Plant Modification Project; and 2. Authorize staff to utilize the Consultant's Panel to seek a professional services agreement to investigate and develop a long-term water treatment and operational approach to reduce concentrations of chemical substances known as perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS) for a not to exceed amount of $150,000. BACKGROUND: Riverside Public Utilities (RPU) currently gets 100% of its water supply from local groundwater basins which are fed by precipitation from the San Bernardino Mountains and local foothills. As runoff percolates into the groundwater basin it gets filtered through the underlying gravels, sands and silts, acquiring beneficial minerals. Percolating water, however, can pick up contaminants as well. Natural trace contaminants include radionuclides, arsenic, and hexavalent chromium. Anthropogenic contaminants include industrial solvents such as perch loroethylene (PCE) and trichloroethylene (TCE); agriculturally related chemicals such as 1,2,3-trichloropropane (1,2,3 -TCP), dibromochloropropane (DBCP), and nitrates; and emerging contaminants, which are a class of chemicals that have not been commonly monitored in the environment but have the potential to cause adverse human and/or ecological health effects and include perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS). RPU is required to regularly sample its water to monitor the levels of these trace natural and anthropogenic contaminants to ensure that they do not exceed U.S. Environmental Protection Agency and California State Water Resources Control Board Division of Drinking Water (DDW)'s regulatory limits. To ensure