Fort Walton Beach Council agenda — 04-29-03 workshop agenda — reading text

existing system Upgrade existing RBC process Replace with MLE Oxidation I 2, 650, 000) Ditch process ($ 4, 262, 500) II! Disinfection I Inadequate chlorine storage & Improve liquid chlorine Improve liquid chlorine metering storage/ metering & building storage/ metering & building 75, 000) 75, 000) III lit Deteriorating baffle walls Seal perimeter walls with Seal perimeter walls with epoxy & reconstruct interior epoxy & reconstruct interior E walls ($ 125, 000) walls ($ 125, 000) Effluent Filtration I Additional denitrification filtration needed Construct additional denitrification filtration Expand existing filters 187, 500) facilities ($ 812, 000) I 4, 118, 750* 4, 793, 750* TOTAL* I Does not include operation and maintenance costs, replacement costs, or residual values over a 30- year operational life. I F:\2001 \ 01.0387. HAI#01.0387. 000 000\Report\ R-4\ 041403 FINAL\TABLE ES. doc ES- 14 04/ 15/ 03 I Ii' II r: 111 A present value analysis was performed for both treatment alternatives. This analysis includes the estimated construction cost and the present worth of O& M for the entire iii process associated with each of the two ( 2) secondary processes. Construction costs were estimated based upon vendor' s quotations, estimated installation costs, cost data for I similar projects. The O& M costs utilized for this analysis included the cost of labor, power, and normal replacement parts. Inflated component replacement costs are added to the present value analysis at the end of each components average service life ( ASL). A I residual value was added back to the present value for components with a useful life remaining after the 30- year analysis. These residual values were based on an assumed I ASL and straight- line depreciation over the ASL for each component. I Based on the cost information researched for the improvements, modifications, and/or upgrades that are required for the existing wastewater facilities, a 30- year present value I analysis was performed for each of the two ( 2) secondary processes and other associated improvements and are summarized below in Table ES- 3. I Table ES- 3 Summary of Present Value Analysis for the Two Secondary Processes I MLE Oxidation I Existing RBC' s Ditch Present Value $ 8, 606, 866. 00 $ 7, 892, 747. 00 I Residual Value $ 1, 512, 500. 00 $ 1, 093, 750. 00 Total Value $ 7, 094,366. 00 $ 6, 798, 997.00 I...~. I ES. 7 CLASSIFICATION AND STAFFING I The current WWTP utilizes the RBC process to treat 4. 5 MGD on an AADF basis of I domestic wastewater. As defined by Chapter 62- 699, FAC, the City' s WWTP meets Category IV and Class B wastewater treatment facility design criteria. The FDEP rules I defined in Chapter 62- 699.310, FAC classify a Category IV WWTP as a facility utilizing trickling filter or RBC process. This chapter also states that a WWTP designed for an I ADF of 3. 0 to 10. 0 MGD is classified as a Class B facility. meets FDEP defined rules for a Category IV, Class B Wastewater Treatment Facility. The City' s WWTP also I F:\2001\ Ol.0387. 000\Report\ R-4\041403 FINAL\ Excecutive Summary 041503. doc HAI# 01.0387. 000 ES- 15 04/ 14/ 03 I  J t;;, lit FDEP rules mandate that a Category IV, Class B WWTP must include staffing as follows: 1. Class C or higher operator: 16 hours/ day for 7 days/ week. I.' 2. The lead/chief operator must be Class B or higher. I The WWTP' s " Class B" designation will not be affected utilizing the MLE oxidation I ditch alternative if treating the current ADF of 4. 5 MOD. As defined by FDEP rules, the MLE oxidation ditch system meets Category III and Class B wastewater treatment facility design criteria. In summary, the selection of the MLE oxidation ditch process maintains the existing Class B designation and will not impact the City' s operational I requirements of the facility. I......" A1 ES. 8 LOCAL RECLAIMED WATER USE ALTERNATIVES This report evaluates the VarIOUS sites available for the development of a public I access/ urban reuse system in the City of Fort Walton Beach near the City' s Municipal Golf Course. The areas considered include expanding the existing irrigation area at the I Fort Walton Beach Municipal Golf Course and expanding the reuse system to include the County Fairgrounds, Municipal Softball Complex, and medians and roadside areas along r Lewis Turner Boulevard. iii The primary consideration for the City with regard to the operation of the system is to decide whether or not the reclaimed water system will be I interruptible. considered. For the initial assessment of this program, Further analysis regarding the operations of the City' s reuse system shall an interruptible source was address the design requirements. hi The analysis shows an estimate of the disposing capability of the each site based on 1. 0 I inch/week ( minimum) and 2. 0 inch/week (maximum) loading rates. The total amount of the reuse disposal ranges from 1.183 MGD to 2.366 MGD based on these assumptions. I Currently, 200 acres of the Municipal Golf Course is presently being used for public access irrigation reuse disposal, which equates to 0. 776 MGD to 1. 552 MGD. I Subtracting this from the total, it is estimated that the increase in reuse disposal would range from 0.407 MGD to 0. 814 MGD. I I F:\2001\ Ol.0387. 000\Report\ R-4\ 041403 FINAL\ Excecutive Summary 041503. doc HAI# 01.0387. 000 ES- 16 04/14/ 03 I III' SECTION 1 INTRODUCTION ill 1. 1 PURPOSE I The purpose of this report is to provide the City of Fort Walton Beach ( City) with proper guidance necessary to plan and upgrade their existing wastewater treatment plant ( WWTP) to I continually meet the effluent levels required by existing and future state and federal regulations. This WWTP Facilities Plan will not only provide the City with a plan of action for the WWTP' s I secondary treatment upgrades, but will also address other necessary improvements outside of the secondary treatment process. These improvements include filtration, disinfection, residuals I management, reuse alternatives, plant process pump station rehabilitation, and pretreatment system upgrades. I 1. 2 BACKGROUND I The City WWTP was constructed ITom 1979 to 1980 and was upgraded in 1992, with the addition of tertiary filtration, high level disinfection, and modifications to the existing sprayfield f! II to reduce ponding during periods of wet weather. The existing facility is a 4. 5 million gallon per r' day ( MGD) maximum monthly average daily flow secondary wastewater treatment facility. However, a portion of the effluent that is pumped to the City' s golf course irrigation system is filtered and additionally disinfected to meet the state requirements for public access effluent disposal. The WWTP is located off Lewis Turner Boulevard on Percy L. Coleman Road and III currently operates under FDEP Permit No. FLA 101923- 002- DWlRlNR that expires on April 1, 2004. Figure 1- 1 illustrates the location of the City' s WWTP. The plant discharges the majority of the effluent to an adjacent 400- acre restricted access reuse, I land application sprayfield ( code ROOl), and lesser reuse volume to the City' s 200- acre 36- hole municipal golf course ( code R002) (public access reuse system). The City owns and operates the I treatment facility and provides wastewater collection for residential, commercial, and industrial customers. The service area includes two sections of the southern part of Okaloosa County I encompassing approximately and Township of Cinco Bayou (population 7.4 square miles. The area includes the City of