PINERY WASTEWATER TREATMENT PLANT UPGRADE
REQUEST FOR PROPOSAL PINERY WASTEWATER TREATMENT PLANT UPGRADEOverviewThe Pinery Waste water Treatme
REQUEST FOR PROPOSAL PINERY WASTEWATER TREATMENT PLANT UPGRADE I. OverviewThe Pinery Waste water Treatment Plant is commissioning an engineering study of alternatives for the upgrade of the plant to meet needs through the year 2020. The study will include areview of the current treatment plant, estimation of future flow and effluent standards, analysis of several alternatives to meet future needs, recommendation of the best course of action, and a preliminary design of recommended processes and cost estimate. This information will be included as part of a210 Utility Plan as required for approval by the Denver Regional Council of Governments (DRCOG). II. BackgroundThe current Pinery Waste water Treatment Plant was built in 1990 and was designed and permitted to treat amaximum month flow of 1MGD. The wastewater (reatment involves primary removal of large solids and grit; biological processes to remove organics, nitrogen, and phosphorus; and tertiary (advanced) treatment via filtration for polishing. Effluent water is currently used to recharge kx:al groundwater (which is withdrawn as adrinking water source). The groundwater eventually flows into the Cherry Creek Reservoir, and from there to the South Platte River. Therefore, (he plant is under the oversight of the Cherry Creek Basin Water Quality Authority (CCBWQA). Biosolids produced from (he process arc treated to Class Aproduct (hat is sold or distributed to (he public. Continued growth in the area and increasingly stringent effluent standards require expansion of the existing facility. The Pinery subdivision is still underdevelopment, and will be serviced by the plant. In addition, surrounding communities are in the process of approving interagency agreements to send wastewater to the Pinery. These areas include Castle Rock, Franktown. Reata, and The Canyons. Additional treatment capacity will be needed to treat these flows. Future changes to the effluent discharge permit may change the level of treatment needed. Receiving waters will implement Total Maximum Daily Loads (TMDLs) for both (he Cherry Creek Reservoir (phosphorus in particular) and the South Platte. Recharge of drinking water also places restrictions on effluent quality. The scope of this study is to recommend optimal process additions to meet future flow and effluent quality. This information is part of the requirements tor a210 Utility Plan as required by DRCOG. III. Proposed Scope of Work A. Summarize Current StatusTrcatincnt Processes a. 一 Effluent StandardsCurrent Flow and Quality inlet, effluent, through processes B. Evaluate Future NeedsFlow -quantity over time a. Effluent LimitsInclude projections of population, How, influent wastewater characteristics Looking at cunent and proposed regulations, summarize likely permit requirements. In particular, evaluate differences in permit as aresult of groundwater recharge versus direct discharge to Cherry Creek. C. Develop Alternatives to Meet Future Needs (through 2020)Evaluate cunent treatment processes to determine if the design capacity of any of the processes could be re-rated; use mcxleling software as appropriate and cuiTent performance a. Evaluate various options for new facilities (hat are needed (minimum of 3alternatives per process)Compare processes for the Pinery on (he basis of criteria including (but not limited (o) cost (capital and operating), compatibility with existing processes, effluent quality (exceeding minimum standards), reliability, operational flexibility. D. Consultant RecommendationsRecommend one best set of processes to upgrade the plant. Summarize why this plan is optimal. E. Preliminary Design of Selected AlternativeProduce drawings showing the layout of proposed facilities. a. Run detailed sizing calculations and produce preliminary plan and profile views of the processes. b. Show the new hydraulic grade through the plant, sizing piping and pumps accordingly. c. Propose aconstruction staging schedule. b. Produce arefined cost estimate (including capital and opcralion/inaintcnancc)
