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Y <br /> • A rotary drum thickener to thicken the "undigested" sludge prior to hauling off- <br /> site for further treatment and land application <br /> The following scope of work is to expand the plant to 6 -MGD (AADF) and t achieve plant <br /> effluent TP and TN concentrations of 0 . 75 mg/1 and 6 mg/l , respectively on an annual <br /> average , consistent with the wetlands permit conditions . Influent design loadings need to be <br /> confirmed, but we believe that the following represents reasonable basis of design based on <br /> our review of the data : <br /> Parameter Value <br /> Influent Flow , MGD AADF 6 . 0 <br /> Influent Flow , MGD Maximum Month 7 . 8 <br /> Influent Flow , MGD Peak Hour 18 . 0 <br /> Influent BODS , Mg/1 250 <br /> Influent TSS , mg/1 200 <br /> Influent TN, m l 40 <br /> Influent TP , mg/1 8 <br /> Effluent BODS , mg/1 Annual Average(l ) 10 <br /> Effluent TSS , mg/1 Any Sample(2) 5 <br /> Effluent TN, mg/1 Annual Average( l ) < 6 <br /> Effluent TP , m l Annual Average( l ) 0 . 75 <br /> Table Notes : <br /> ( 1 ) Annual Average Wetlands Discharge <br /> (2) Any Sample Discharge to Reclaimed Water Reuse <br /> PBS &J will provide design , permitting and construction phase services for thim. expansion of <br /> the West Regional WWTP from 2 MGD to 6 MGD . The needed facilities will include <br /> construction of a new 3 . 0 MGD 5 - stage treatment train and retrofitting of the existing 2 <br /> MGD train to 3 . 0 MGD 5 -stage treatment train . The project would generally provide for <br /> new pretreatment structure , common anaerobic selector tank , common first anoxic tanks , <br /> new aeration basin , new blower building , retrofitting of existing oxidation ditch , common <br /> 2nd anoxic tanks common re-aeration tanks , two new clarifiers , three traveling bridge sand <br /> filters , chlorine contact tanks , additional rotary drum thickener and wetland <br /> recirculation/return pump station . Consulting services for this project sha 1 be provided <br /> under this Work Order and will focus on the following general objectives : <br /> A . Final design , permitting , and bidding services for the needed facilities . <br /> B . Construction administration and observation for designed facilities <br /> C . Start up , O&M manuals , operations assistance , and training (To be negotiated as a <br /> separate amendment when/if requested by County) . <br /> IRC West WWTF Scope Page 2 61312005 <br /> CADocuments and SettingAkdonlevy\Lorul SettingATemporary Internet Fi1eA0LK20sWWTPEXPNASI0N Design Scope-Rqj Revised by RRM .doc <br />