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Attachment #1 Work Order Number 19 Demonstration of 4 -log Virus Treatment of Ground Water Rule North and South RO Water Treatment Plants Project Understanding In response to the US EPA Federal Groundwater Rule, Florida's public water systems (PWS) that use groundwater will have to comply with the new rule effective December 1, 2009. Although the USEPA approved groundwater rule has not been incorporated into the Florida Administrative Code and is not expected to be approved until late 2010, any Florida PWS must still comply with the Rule. The intent of this rule is to increase protection against microbial pathogens in PWS's, which essentially requires additional microbial monitoring for all PWS's. If 4 -log (99.99%) virus treatment can be demonstrated by each of the treatment facilities, source water and finished water "triggered" and "assessment" microbial monitoring will not be necessary, which will reduce the amount and frequency of bacteriological testing. Achieving 4 -log removal requires written approval by FDEP. Indian River County Utilities staff has requested Kimley-Horn and Associates, Inc. prepare and submit a demonstration of 4 -log removal/inactivation of viruses summary for both regional water treatment facilities, the North Hobart and South Oslo Road membrane water treatment facilities. The intent is to receive written approval by FDEP of four -log virus treatment for both facilities under the current Guidelines for Four -Log Virus Treatment Treatment of Ground Water, Drinking Water Section, Florida Department of Environmental Protection, October 2009. SCOPE OF SERVICES The Scope of Services for Work Order #19 consists of the following: Task 1 — Prepare Water Plant Schematics Consultant will prepare a water plant schematic of the water plant components which are relative to demonstrating 4 -log removal/inactivation, consisting of treatment components, chlorine injection points, monitoring locations, clearwell, ground storage tank, high service pumps, etc. Consultant will prepare schematics for both the Hobart (North) and Oslo (South) water treatment plants. Owner will furnish electronic version of the Hobart water plant schematic for use in preparation of submittal to FDEP. Consultant will submit water plant schematics to FDEP as part of the information in demonstrating 4 -log virus treatment. Task 2 — Review Historical Data of Water Plants Consultant will review historical water plant operating data which can be used to calculate the appropriate "CT" (chlorine residual � C and contact time �T). The parameters needed to calculate CT consist of pH, temperature, chlorine residual, and volumes of tanks/clearwell/piping. K:AWPB Civil\Genera]\Miller\Indian River County\IRCU GWR Evaluation.docx Page I of 3