E-CAMP - Encina Wastewater Authority

P‐1.3.007SCs 5 and 6 Mech RehabBackgroundSecondary Clarifier Nos. 5 and 6 were installed in 1992.The condition of the clarifier components was assessedduring FY 2011 and the mechanical equipment was foundto be in corroded and worn. The collection equipmentinstalled in Secondary Clarifier Nos. 5 and 6 is similar tothe equipment installed in Secondary Clarifier Nos. 1through 4. Clarifier Nos. 1 through 4 equipmentreplacement was completed during FY 2011 – FY 2012,and similar equipment replacement is anticipated forSecondary Clarifier Nos. 5 and 6.DescriptionProject work will include the following:Figure P‐1.3.007Secondary Clarifier Nos. 5 and 6CorrosionDemolish and remove existing clarifier mechanism and appurtenancesInstall new clarifier mechanism including removal and disposal of all support structures requiredfor the installation of the clarifier mechanismRemove and replace anchor bolts to install new clarifier mechanism and perform concrete repairRemove and replace the sludge and scum collectorRemove and replace the feed wellApply three‐coat epoxy coating system to all steel portions of the clarifierProtect and reuse the bridge and ancillary equipmentClean and repair the concrete wallsRepair, patch with steel plate, or replace portions of launder trough and support system asneeded.Abrasive blast clean launder trough and supports in place; Abrasive blast clean steel portions ofthe bridge. Apply epoxy coating system to all steel on the launders, supports, and bridge.Replace existing rectangular FRP weirsRemove and replace the drain gates for all clarifiersRemove and replace the influent gateRemove and replace the density bafflesJustificationThe clarifier equipment is recommended for replacement based on a condition assessment whichconcluded that it is in poor condition. Mechanical or corrosion failure would reduce secondarytreatment capacity and impact water quality.Project DeliveryTraditional Design – Bid – ConstructE FY2014 E‐CAMP Report 2012‐12Dec.docx 47 December 26, 2012