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07-22-2008 EAGLE RIVER WATER & SANITATION DISTRICT WASTE HEAT RECOVERY PROJECT• Memo To: The Honorable Mayor and Town Council Through: Larry Brooks, Town Manager From: Jennifer Strehler, P. E., Director of Public Works Date: July 22, 2008 Re: Waste Heat Recovery Project Summary: Staff at the Town and the Eagle River Water and Sanitation District (ERWSD) have been working with consultant CDM, Inc. on the project referred to as the "Waste Heat Recovery Project". The attached written document summarizes the project, entitled Proposal to Design • and Construct a Community Heat Recovery System which has been updated from the previous March draft. This revised version, although still a draft, acts as the core document for grant request submittal from the Town and the ERWSD. ERWSD has also been provided with a copy of this document and had been invited to attend this work session. This work session provides an update on how this project is proceeding. Jenny Strehler will frame this conversation and discuss grant funding requests. Scott Vandenburgh (CDM, Bellevue) will present details of the project, including some recommended technical improvements over the original proposal and an updated capital cost estimate. [Later in the evening meeting, Justin Hildreth will ask the Council for confirmation of design direction on the Main Street design project with respect to the snow melt question.] Previous Council Actions: January 22, 2008 - Work session to present Snowmelt Feasibility Study. At that time, Council expressed concerns about the energy consumption and carbon footprint of conventional snow melt systems. Council directed staff to assume 8-foot wide snow-melted sidewalks along the future Main Street and to pursue environmentally-friendly options to deliver the required energy to the snow melted areas at Avon Station and future Main Street. March 11, 2008 - Work session to present Wastewater Treatment Plant Waste Energy to Snow Melt System Proposal (February draft). This proposal was favorably received by Council and staffs request for $90,000 to conduct engineering predesign was granted as a joint project with ERWSD. Council further suggested that we evaluate means to include pool water heating and/or building space heating into the proposed heat loop from the wastewater treatment plant. • March 27, 2008 (Presentation to ERWSD Board) - Work session to present Proposal to Design and Construct a Community Demonstration Facility Wastewater Heat Recovery System (March Page 1 of 5 draft). This proposal was favorably received by the Water and Sanitation District Board; $90,000 was allocated for engineering predesign as a joint project with the Town of Avon. • March 25, 2008 - Award of Main Street design contract to Britina which did not authorize the bid-alternative of $13,800 to incorporate design of snow melt piping. July 22, 2008 - CIP Budget Amendment to assign $90,000 to preliminary design of this project. Discussion: Staff at the Town and the Eagle River Water and Sanitation District (District) are working with consultant CDM, Inc. on the project referred to as the "Waste Heat Recovery Project". The initial goal of this project was to extract heat from the Avon Wastewater Treatment Plant (Avon WWTP), convey the heat via a glycol loop into Town-owned property, and to use the heat to melt snow at Avon Station (about 16,000 so and along approximately 8-foot wide sidewalks planned for Main Street (about 48,000 so. Engineering evaluation of the original concept identified some additional beneficial uses for heat from this heat loop, including Recreation Center pool water.heating, building space heating, and heating of process flows at the Avon WWTP. CDM was tasked with feasibility analysis and preliminary engineering of this heat recovery system. The attached document (referred to as a project "pro-forma") provides detailed information about the project and will be used for grant applications. Several technical options were initially evaluated by CDM to optimize the cost-benefit and carbon footprint of the heat recovery system and associated heat loop. Note that some of these uses are intermittent while others are reasonably continuous. It was determined that a secondary heat source such as solar thermal and/or natural gas boilers should be located on the loop in order to boost system temperatures during snow events and to better balance heat generation with peak demands and reduce long-term operating costs. CDM has also taken into • consideration how to control this system, to reconcile the accounting for the two agency-users and to phase certain construction elements. The presentation will discuss the technical analysis and the recommended system. A brief summary of the results of the feasibility analysis is provided herein. Table 1 lists the resulting three best options for heat generation of equivalent capacity (12.06 BBTU total annual consumption, 8.0 MBTU/hr peak delivery). For purposes of considering heat sources for snowmelt, Table 1 includes Options 1 and 4. The recommended heat recovery system is Option 3, referred to as the "hybrid system". This system is described in more detail in the attached document. Table 1 lists the estimated capital and operating costs of each alternative. Table 2 provides an estimate of the carbon footprint of each alternative. In Table 2, the third column lists the estimated carbon footprint of the snow melted areas only, while the fourth column lists the combined carbon footprint of the Recreation Center (about 605 tons C02/yr in 2007) plus the areas to be snow melted. The difference between these two columns shows the environmental benefit received by the Recreation Center by the heat loop. The core benefits received from this project with selection of the hybrid option are: • Reduced carbon footprint for the Town's snowmelt system as compared to the conventional approach (100% natural gas boilers) by about 135 tons/yr CO2 (a decrease of about 47%!) • Reduced carbon footprint for the Avon Recreation Center as compared to current emissions by about 568 tons/yr CO2 (a decrease of about 94%). • Reduced Town's annual operations cost as compared to the "do nothing" alternative by about $18,000/yr. • Page 2 of 5 • Increased treatment efficiency and capacity at Avon WWTF without expansion in • tankage or treatment works (e.g., by increasing solids handling throughput). • Adds direct control of wastewater effluent temperature discharged from the Avon WWTF to the Eagle River. • Two-agency project provides access to grant funds which would not be available to either agency alone (e.g., DOLA New Energy Communities Fund with awards available up to $2M). • Demonstrates environmental stewardship, alternative energy leadership, and success through collaboration by the Town and the District. Schedule - The schedule for work in this project and how it relates to other related projects and key grant deadlines is provided in Table 3. CDM is currently conducting preliminary engineering of the recommended hybrid system and assisting with preparation of grant applications. Additional information is needed from the District regarding siting options within the plant property, to identify some potential additional uses for the heat from this system, and to quantify other benefits which they would receive from such a facility. Once this information is obtained, it will be able to determine the approximate share of the capital and operating costs which should be assigned pro-rata to each agency. Assuming the schedule listed in Table 3 is held, such a facility may not be fully in place until the summer of 2010. Public Works will need to manually remove snow at Avon Station and on Main St. until this time. Implications to Main Street Design - Later this evening, the Council will be asked to provide staff with clear direction on whether to add snow melt into the Main Street design, irrespective of the source of heating. This decision is necessary because the whole street design truly hinges on this question. If Council wishes to add this in, Engineering will execute the bid-alternate with • Britina and the construction cost for Main Street can be expected to increase by $825,000 for 48,000 sf of snowmelt piping. Additional engineering and construction costs will be incurred to design and build some type of heat generation system to deliver energy to this piping (cost estimate as shown above). Financial Implications: If the heat recovery project is fully constructed, the resulting facility as described in the attached document is estimated to cost about $3.68M to construct and about $192,000 per year to operate. Although the exact cost-benefit split has not yet been determined, it is anticipated that the Town will use a significantly greater proportion of the energy from the heat loop as compared to the District. The Town's pro-rate share of the capital cost of the hybrid heat recovery system is expected to be approximately 20-50% higher ($600,000-$1,00,000) than a 100% natural gas boiler system, however, there is a reasonable potential for grant monies to offset this cost differential. In addition, the long-term operating costs are expected to be lower. Finally, the hybrid system would provide additional non-economic benefits to the Town and to the District, including a significant reduction in the Town's carbon footprint compared to other options. Recommendation: Staff recommends continued pursuit of grants to assist with final design and construction of the "hybrid system" as described in the attached document. The resulting infrastructure would create a robust and cost-effective heating system, available for multiple public users within the West Town Center. If Council agrees, staff will prepare and submit several grant applications and include costs for this project in the 2009-2013 CIP. • Town Manager Comments: Page 3 of 5 Table 1. Summary of Alternatives: Estimates of Probable Cost(a) • Comments / Additional Option Name Capital Cost O&M Cost Benefits 1 100% NG Boilers for (a) $2.40M $185,000 /yr Town of Avon pays 100% in this "base case" option; no benefit Snowmelt (TOA only) to Recreation Center or District Maximum temperature of glycol loop for snow melt is limited to 100% Heat Pump (a) (two 120 F. This will reduce flexibility 2 medium sized heat pumps plus $3.91 M(b) $250,000 /yr and make controls more solar thermal) difficult. System can be used to reduce energy costs for Avon WWTF, Recreation Center and future Town Hall Readily available components; able to produce glycol water temperatures in excess of 140 F Hybrid System(s) (medium-sized under all conditions, excellent 3 heat pump, solar thermal, natural $3.68M(b) $192,000 /yr control and turndown capability; gas boiler for peak) System can be used to reduce energy costs for Avon WWTF, Recreation Center and future Town Hall Town of Avon pays 100% in this 4 Manual Snow removal $0.25M TOA $209,000 /yr "do nothing" option; no benefit to Recreation Center or District (a) Heat generation of equivalent capacity (12.06 BBTU total annual consumption, 8.0 MBTU/hr peak delivery (b) Costs will be prorated to each agency in proportion to the benefits received. Table 2. Summary of Alternatives: Carbon Footprint Snowmelt + Snowmelt Recreation Areas only Center Option Name (tons C02/ r) (tons C02/yr) 1 100% NG Boilers for Snowmelt 288 893 2 100% Heat Pump 0 37 3 Hybrid System 153 190 4 Manual Snow removal 65 670 .7 • Page 4 of 5 Table 3. Proposed Project Schedule 0 J • Heat Recovery System Engineering Preliminary Design Main Street Project Design Submit grant request to Colorado Department of Local Affairs (CDOLA) for New Energy Communities Initiative Grant (e.g., $2,000,000) Submit grant request to Water Environment Research Fund (WERF) (e.g., $200,000) Submit grant request to Colorado Governors Energy Office (GEO) (e.g., $200,000) Learn results of grant requests Heat Recovery System Final Design Main Street Project Construction Construction Heat Recovery System Date In progress In progress Letter of Intent submitted 7/18 Application due 9/19 Due July 29, 2008 Pro Forma due 7/24 Application due mid-September October - December, 2008 December 2008 - May 2009 April - November 2009 June 2009 - September 2010 Page 5 of 5 PROPOSAL TO DESIGN AND CONSTRUCT A COMMUNITY HEAT RECOVERY SYSTEM r ;A TOWN OF AVON and EAGLE RIVER WATER AND COLORADO SANITATION DISTRICT milml C_ ry_.1_. 0 R~1 t3 0 A COOPEfIVE VENTURE AND JOINT APPLICATION BY: I. Summary Two local entities are working cooperatively to conduct urban renewal, replace aging and inefficient infrastructure, and to build a better community in Avon, Colorado. The Town of Avon (Town) is the local government authority who provides services including public works, transit, building permitting, public safety, recreational services engineering, and general government and engineering services. Eagle River Water and Sanitation District (District) provides potable water and collection, treatment, and disposal of wastewater in Avon. The Town Council and the District Board have complementary goals of conserving energy and ' providing long-term operational sustainability to the loc population as it grows and develops. This proposal represents a joint application by thc"My_Na 'I N the District to design and construct a waste heat recoveyy system that will capture solar heat and extract heat from processes for beneficial use in the Avon ~unity. The biosolids processing at the WWTP, provi e; the cc snow in high traffic pedestrian areas in ord tM-' e p heat recovery system would be provided by nd-g Cross Energy. The use of wind power and a t ve District to provide Znec structure i v compared to currenons. .u her, the pro' t effluent temneratur is curr Iv discharse Eagle River in Autumn x treatment plant (WWTP) be utilized to optimize wt mg pool, and to melt s`ty. Power for the waste Oily purchased from Holy will enable the Town and ement aXreduce the carbon footprint will achieve a reduction in the wastewater _t~e Eagle River during fish-sensitive periods. The Town and stri t o expect to e tax and rate payers money as a result of F status quo because it results in a more this project as c ared to tive spr sustainabl ratio is excites roject will be the first of its kind - to use plant waste hgWfor a snow %erNvste~N the United States. Prelimin gineering an y s wasrformed by Town engineering staff who determined that the propose Q'. to heat re co " project is technically feasible and appears to be cost effective. The proximity f ` e Avon TP to the targeted core pedestrian area and the ability of the Town and Distric''"`; _ are r urces have provided the basis for a successful public works project. The Distric eed to locate mechanical and electrical equipment required for this project on the WWTP and to share in the construction and operations cost of the system. The Town has agreed o limit the surface area for snow melt in the urban renewal area to that which can be served by this waste heat recovery system, focusing on only the busiest pedestrian areas. The pool will retain its existing natural gas boiler system for back-up. Both agencies have made a commitment to share in the construction and operational costs of the project in proportion to the benefits achieved. This document provides a description of the proposed project which can be used to communicate with project stakeholders and the public. This document includes the necessary elements of a Page 1 of 15 7/16/2008 grant application, including introductory information, project benefits, technical details, financial considerations, and project management plan and schedule. This project shows how local agencies can work cooperatively for mutual benefit to provide infrastructure which accommodates growth and urban renewal and simultaneously demonstrate strong environmental leadership. II. Introduction Avon, Colorado, located in the heart of the Rocky Mountains, is a gr _ community which is strongly dependant on a quality environment and recreation-based nomy. The town is located at 7,420 feet MSL and has four distinct seasons, including sno inters lasting from mid- November until mid-April. Currently, the population of Av „ era out 7,500 (swelling to about 12,000 during the winter months). The population r cted to to a year-round average of about 20,000 by 2020. Avon is undergoin a newal and i ization in the downtown core to eliminate blight and improve eco is conditions, provide jobs and attainable housing, and to offer transportation co s to th egional area. agle River Kay er The Eagle River is a sparkling clear river supplied from'.` several of Colorado's highest peaks; thi river runs from Tennessee Pass through Avon and disc- at an average daily rate of about 565 cfs into the Colora bout 50 miles downstream in Gypsum. 1 Avon resi is, visitors alike depend on the Eagle River in n ero This river is a designated f eational Use any recreational activities u IT iI abundant t t fishing, white water rafting, d, ayakin( is river is b the source of potable to there dent of treate wastewater for the Town o Tfit le Riv Y continues to essure o a gr lation. The State o or artm - Public Health and Environment has expressed concerns "I R~Ix about iver's abilit}ceive a \yjj jstewater discharges in the fall and early winter. The Dist erates the A nJWastXater Treatment Plant (WWTP). This plant has an average flow of 2.2 d discharge to the Eagle River in Avon at a point when the average daily river flow rate ut 316 c During September and October, minimum river flows at this. location have beede y U.S.G.S. at about 102 cfs.3 Avon WWTP staff has observed effluent temperatures u_ g these months that are in the range of WC to 1 For this reason, the District ERWSD Loading Dock and Driveway is considering extracting and dissipating heat from plant effluent. The District is also looking at means to pre-heat the wastewater solids prior to stabilizing them in an auto- thremal thermophilic aerobic digestion (ATAD) process. The ATAD process operates at increasing efficiencies and gains capacity with each incremental temperature increase above 50°C. Pre-heating will enable the WWTP to achieve temperatures of 55°C in the first stage of the Page 2of15 7/16/2008 ATAD (currently the process can only manage 40°C in the first stage). Post cooling the ATAD effluent not only provides an opportunity for heat recovery, but also reduces final solids processing costs by reducing the chemical demands. Post-cooling the biosolids to 25°C increases the efficiency of the biosolids dewatering centrifuges and reduces the polymer demands, increases, centrifuge throughput, and allows for a drier final biosolids product. Thus, not only are chemical requirements reduced, but operational processing times are reduced, and product hauling costs are lowered. If fully recovered, about 1 MW of thermal energy is available between the wastewater effluent and the ATAD effluent. Section IV describes a method that economically maximizes the waste heat recovery. Beyond the need for heat recovery in the solids processing s, heat for space heating and for snowmelt of the driveway and would allow the plant areas currently set aside for stockpilin available for other uses, and the District would likely re plowing. The Districts waste heat demands are unlik o captured from wastewater effluent and the ATAD ess, t any surplus heat recovered from the WWTP ava the The Avon WWTP is located adjacent to the Town's url owned land by a Union Pacific Railroad right-of-way. The Town of Avon is undergoing a majo ur1 renewal effort to eliminate blight and stim economy. One important objective of this e the creation of vibrant streetscapes and multi transportation connectio expected to increase t live-work arrangem, tourism. Winter tounsn visitors come to Avon's lodges and at nearb eas me] the d wn core r renewal is ~e ' bs and loc fate ith recreatio peci strong, as and sn ding an4" ver Creek. In von, _fin traffic is District could use waste Lock. This improvement Nrge pi - snow to be made o r costs iated with 11, , fu utilize all t " ' . ilable waste hu the District ha e to make To of Avon, a nea eighbor. e ea, separate rom town- Lea to be improved by project Ars IM al higli~ the winter, mlpedesns wear ski boots and carry sports equipment. Snowy and icy su create slippi~i and lling hazards, increase the Town's insurance claims, and work against own's goal. f creating a vibrant streetscape. For this reason, a snow melt system for the st sidew s, and paths was incorporated into the urban renewal project over a relatively large ar 0 sf). The Town considered either natural gas fired boilers or ground loop pumping atives that would have consumed approximately 348,000 therms of natural gas or 3,620,0 " kW-hrs of electricity, respectfully. The least cost option (natural gas boilers) was estimated to cost approximately $4.45 million to construct and about $650,000 per year to operate and would have emitted more than 2,100 tons of carbon dioxide into the atmosphere. After recently taking bold actions to reduce the Town's carbon footprint via purchase of 100% wind-generated electrical power as wind power in January 2008, the Avon Town Council voted against pursuing the large snow melt streetscape and sought other options to fulfill urban renewal goals in a more sustainable manner.4 Page 3 of 15 7/16/2008 QiML r: Current and Proposed Future look of Streetscape in Avon's Ur a Area (note snow melt system in use on right) District and Town staff met informally in January 2008 a progres rban renewal efforts. Staff identified this sustainability initiative win-win for the Tow District, the Eagle River, and local residents. This project will result in economic benefits to III. Project Statement and Benefits both agencies. An after-project operational savings of about $20,000 per year has been This project proposes to use a combinati~Pnf~ estimated for the District and the Town will save waste heat from the wastewater plant and s about 577.000 ner vear for the Town. thermal water heating as the prime energy s'", rce ste heat r ' very system that provides snow melt in core pedestrian and high-risk a s in the community recreational center, and within the WW~P, cesses. Dune nter sto or at night when solar energy is insufficient for the sno e n d or canno eet requir d snow melt system temperatures, backup natural gas b would "e tarted. The ste heat in the effluent would be transferred using a heat-pump yst over y renewable `R -generated electricity. Between the solar thermal and the heat-pum e n foo mt of the system is significantly reduced compared to techn o 'es. o melt demands are by nature seasonal and wastewa rocess ands ess than the available heat, surplus heat could for most of the ye e used to supp`1 t to t , hot tubs, and showers in the recreational center. This wo r scantly reduce „h. town's ent carbon footprint. ty to showcase how common process technologies and This project V mechanical co pplied in a unique way to solve several problems facing communities todany facilities in the U.S. that shed waste heat without obtaining any benefit from ry systems such as the one proposed here have a wide application. This monstrate the degree of energy efficiency available with current heat recovery technology. It would be the first of its kind in the United States with respect to the use of waste heat from a wastewater plant for the creation of a snow melt system. The project demonstrates the range of options available to local governments and agencies that are willing to work together and apply creative engineering solutions to address difficult issues including climate change, urban renewal and limited resources. At the local level, this project has very direct and exciting benefits, including: Page 4 of 15 7/16/2008 • The Town is able to improve the safety and vitality of core pedestrian areas with a limited impact on the Town's current total carbon footprint. • The Town could reduce natural gas purchases for the recreational center from 10,800 decatherms per year to approximately 3,200 decatherms per year. This translates into a savings of $77,000 annually in natural gas costs and a reduction in carbon footprint of over 600 tons per year. • The Eagle River benefits when the effluent temperature is reduced prior to river discharge, improving river temperatures for fish spawning. • The District will increase the cost-effectiveness of solids treat rocessing by reducing expensive polymer consumption and increasing bi ids ke dryness. Assuming a 50% reduction in polymer usage results, the ct could realize an annual savings of about $20,000.5 • The District benefits by reducing their plant site ar a ently t snow storage and reducing the risk of back-up of the plant drain a - ater sep systems. As compared to other projects competitively this project includes: • Multi-agency cooperation • Environmental leadership • Reduced carbon footprint operatio • Improved river water temperatures fi • Reduced risk for liability claims (fro • Installation of the em of its typ • Urban renewal blig e rea • Tangible ne' b ood be 'e it provided r grant Ii support, U.S. wastewater treatment plant IV. TechnicaL etail s J Figure ers a dra of posed heat recovery syste cess flow scha Fig. ows the project a psi l site and cal locat>ons.t i e para train of „ l mechanica ment consi g of one plant effluent T pump, one he p compres or, and one glycol pump is anticipated to ca waste ` at from the plant and. J~ transfer it to glycol 11 ping. Only a portion of the ~r plant's final effluent a maximum of 1,040 gpm (1.5 mgd), would be pum d through the heat recovery system and none of this effluent would ever leave the plant . s-. 1 property, eliminating concerns about water rights. The portion of the effluent which is cooled through the heat recovery system would be blended back with the remainder of the effluent in the final effluent discharge piping, and would flow to the river outfall. Heat would also be recovered from the wastewater treatment plant's ATAD system by pumping the hot sludge through a glycol to sludge heat exchanger. Page 5 of 15 7/16/2008 ATAD process stream piping river outfall. Heat would also be recovered from the wastewater treatment plant's ATAD system by pumping the hot sludge through a glycol to sludge heat exchanger. Due to severe winter weather and existing space limitations, the waste heat recovery system must be housed indoors in a new building. Most of the year and during the daylight hours, the system's heat would be provided by a solar thermal hot water system. Under peak heating demands, a natural gas boiler could be operated to provide supplemental heating to the system. The solar thermal system and the supplemental boiler building could be located on the Town property and potentially on or in the recreational center. The glycol supply (GLY-S) and return (GLY-R) piping operates in a closed-loop configuration. This piping would be located within the plant site to deliver heat to the District's on-site snow melt system and would extend off site into Town-owned right-of-way and connected to the snow melt system in public pedestrian areas. A pair of 8-inch diameter pipes would be installed and located approximately as shown in Figure 2. The piping would be insulated and buried at least 4 feet deep to be below the frost zone and to minimize heat losses. The distance between the plant and the Town's pool and snow melt connection is approximately 1,700 LF; most of this distance is in the grassy area along the south side of Benchmark Road. The pipe alignment includes one crossing under a Union Pacific Railroad. The Town does not expect difficulty in obtaining a utility easement for this crossing. Once fully completed, the heat recovery system would reduce the effluent temperature for the processed effluent flow of 1,040 gpm by approximately 4°C (e.g., from 15'C to 11 °C). The temperature in the final stage of the ATAD system could be reduced from 54°C in the previous stage to about 40°C. The closed glycol loop would have a flow of about 750 gpm and would operate at a temperature differential of approximately 12°C between the GLY-S and GLY-R (e.g., from 55°C to 43°C). Page 6 of 15 7/17/2008 The system control would be analogous to similar systems. Moisture and temperature sensors at the pavement surfaces would call for increased pumping rates when snow begins to accumulate. The temperature of the glycol loop would be monitored against pre-selected temperature set points and would be used as a trimming signal to ensure a smooth operation. The thermostat on the heat pump and backup boiler would be connected to the glycol temperature measurement system. The District would add this system to its existing supervisory control and data acquisition system (SCADA), allowing for display on the operator's terminal. Back-up power would not be necessary for this system. In the event of a power outage, the system could be manually re-set when grid power is restored to the plant. Itk The system in its entirety is sized to provide a maximum of 2,300 -thermal of energy. This does not include the solar thermal system that has a capacity o thermal, under typical 11 clear sky daylight conditions. Approximately, 1100 kW-the 101 f en ` is provided from the heat pump to the GLY loop and the backup boilers woul vi an ad 1 1200 kW- thermal as needed. A minor amount of heat would als deli ered from th D system to the GLY loop. The heat from this system would provide up to 30 W/s sf) of snowirelt energy for approximately 75,000 s£ At present, the expected uses u include about 10,000 sf located at the District's plant and about 65,000 sf ted in the Town estrian areas. An additional 146 kW of energy is provided for peak A n. A dge pre-heats ads. The solar output of 316 kW-thermal would meet the daytime p' ` demands fora t 9 to 10 months of the year. The total electrical d( equipment on this sy the new pump static system will consume this electrical draw. a A-V %AV This project allows the Town to meet both its tlon for the sustainability goals and achieve urban renewal with a safer and more vibrant streetscape. (e.g, 1' ins housed )n 'TIP) is estimat to e about 500 kW.6 Operation of the ate 160,000 kW of wind-generated electricity annually. Of a of this electricity will be for running the heat n mainta ' of demands and provide pre-heating to the will `6 proximately 3,170 decatherms of natural gas per year and year ° on emissions. In comparison, the Town of Avon f0„ 0 dec erms of natural gas for the recreational center from 7 an released approximately, 567 tons of carbon emissions over sed hybrid heat pump, solar thermal heating, and supplemental d eliminate natural gas purchases for the recreational center except ow events. pump o2cess. ~The' l at ATAD pr od " otal of 190 totlt~l purc as a roximately 1 January thr November, the same time d. The p natural gas boile in wt under times of siami ` V. Financial Considerations Capital Costs The planning level estimate of probable cost for this system is approximately $3.68million to plan, design, and construct (July 2008 dollars). This estimate does not include costs for the Town's street revitalization projects on Lake Street and Main Street or the District's cost to reconstruct their driveway and loading dock to install snow melt piping. These excluded costs Page 8 of 15 7/16/2008 would be born directly by the respective agencies. A breakdown of cost components is shown in Table 1. The Town and the District have agreed to split the design and project administration costs (i.e., "soft costs") equally, with each agency paying 50%. The agencies have allocated a maximum of $90,000 each ($180,000 total) to complete engineering design to a 30% level in 2008. Additional funds will be needed in 2008 and 2009 to complete the design. The agencies are applying for grant funds to be used for the construction phase. Assuming that a significant portion of the target grant funding is obtained, the two agencies have a ed to pro-rate the achieved. An even remaining costs (i.e., all non-grant funded costs) in proportion to Xor project cost split for construction costs has been assumed in Tabl dis cussion purposes. Grant Eligibility The agencies are seeking grant funding up to 80% of the ec with `ng provided as a local match. The following potential funding partner d gra t sources ha n identified thus far: • Water Environment Research Federation • State of Colorado - Governor's Energy Office • Federal Government o Department of Agriculture ble Energy S t s d Energy Efficiency Improvements o Department of Agriculture C ervat vatio rants o Department o nergy State E U ogre} ial Projects • Holy Cross Ener American Pu orkss ciation • StEPP Fou a trateg nvironment ject Pipeline) r, • Turner Foundatio Page 9 of 15 7/16/2008 Table. 1. Estimate of Probable Capital Cost Component Capital Cost Engineering and Fees A/E Fees (10%) $327,337 CM fees (2%) $65,467 Surveys and Tests (0.5%) $16,367 Permits and Fees (0%) 0 Subtotal 1 Construction Cost Heat Pum Buildin 00 Boiler Building $9 Glycol Pumps 2 700 m $120, Wastewater Effluent Pumps 1 350 m $50,000 " ATAD Preheating Pumps 2 $40,000 Heat Pumps 1 $103,000 Heat Exchanger 2 $60,000 Boiler $60,000 Solar Thermal Heating System $200,000 GLY Pie 3400 LF 8" sch80 PVC, double-wall e long no.w. " , 8,000 Jackets, Insulation, pipe supports $61,200 Electrical 500 kW service, transformer, motors, swi ear $400,000 Instrumentation and Controls ltO~v $100,000 Equipment ads and misc. u $40,000 Site Civil t" $50,000 Miscellaneous Piping n ctions $100,000 Subtotal $2,017,200 Contingency $504,300 ubtot stuction Cos with Contingency $2,521,500 N IN Ge s tractor's Overhea `3n Genera 4' itions 18% IN $453,870 General Actor's Profit 11. o. $298,000 Total Construction Cost $3,273,370 nd Total $3,682,541 Operating and Maint nance Cost The cost estimate to operate the heat recovery system at the Avon WWTP is approximately $192,000 per year (July 2008 dollars). A cost-sharing agreement has been developed between the authorizing agencies as follows: • The Town pays for operation of the heat recovery system throughout the year; the electric meter would be assigned to the Town. This allows the agencies to use wind-generated electricity that the Town purchases from Holy Cross Energy to power the system. Page 10 of 15 7/16/2008 • The District contributes funding annually to the Town's general fund to compensate for electric power to run the system during months when snow melting is not necessary but when the District elects to shed waste heat. (Snow melting is generally necessary only from November 15`h through March 31"). • The District provides the land, indoor building space, utilities and control system connections (excluding electricity), and plant inter-ties for mechanical and electrical system components at the Avon Wastewater Treatment Plant. Maintenance of the system is conducted by District staff and bi , to the Town of Avon at cost. VI. Project Management Plan and Schedule This is a two-agency project to be conducted by the To a he District. e, fer Strehler, Contact information for the agencies and th ng>onsultan as follows: Director of Public Works for the Town, and Chris es, Wastewater Opera Manger for the District, will execute this project cooperative fifer an Chris are wor y` ether to develop the final project plans, communicate with int en g staff and c sultants, report to the District board and local Avon leaders on pr and manage the project's overall scope, schedule, budget and quality. C is under a dual ct by the Town and District to provide engineering predesign and desig *ces for this pro}I''c, able 2. Co ,,~w' 4004 Town of Avon F~agle River ter and nitation Dist : Consultant Jennifer Strehler P.E. Scott Vandenburgh Director of o Wastew ivision Manager Project Manager 500 Sw' ulch Rod Forest Road 11811 NE 1S` Street, Suite P.O. 75 81657 201 Avo 20 Te 970) 477-5494 Bellevue, WA 98005 Tel: 970 100 F X: 970 477-5434 Tel: 425 519-8399 FAX: (970) = 58 cmaines&erwsd.org FAX: (425) 646-9523 Strehler avon.o vandenbur hg sr&cdm.com _ The construction phases will be competitively bid, with award to the responsive and responsible general contractor who offers the lowest monetary bid. The Town would take the lead on awarding the contracts for construction and managing project financing and payments to contractors, with the District acting in a repayment capacity for shared-cost items and providing on-site inspection of the mechanical and electrical work conducted within the Avon WWTP property. A project schedule is shown in Table 3. A Site Plan of the Facilities is shown in Figure 2. The physical layout of the construction is shown in Figure 3. The total project would consist of Page 11 of 15 7/16/2008 construction of the heat pump facilities at the WWTP, construction of the glycol loop between the new heat pump building and the Avon Station, installation of the supplemental natural gas boiler and the solar thermal system, and connections between the glycol loop and the existing recreational center. The Avon Station is a multi-modal hub which connects car, transit, pedestrian, bicycle, gondola and a future light-rail link. A snow melt system (about 25,000 sf in area) is already in place under brick pavers at Avon Station. Additional pavers will be added down Lettuce Shed Lane by the Town in the near future. Expansion of the snow melt system from Lettuce Shed Lane to a Aeast and west to plaza areas and sidewalks located along the Avon's new Main Street wou kip made in this project. Since Main Street will be built in 2009, the Town inten&a1 nually remove snow for the first winter season untithe new heat recovery system is in Table 3. Proposed Project S Activity Date Heat Recovery System Engineering Prelimina In progress Main Street Project Design progress Submit grant request to Colorado De ment of Local Letter of Intent submitted 7/18 (CDOLA) for New Energy Communiri iative Grant (e pplication due 9/19 $2,000,000) Submit grant request to Water Environme Rese d ;Due July 29, 2008 (WERF) (e.g., $200,000) . Submit grant request t Governors ergy Offic Pro Forma due 7/24 (GEO) (e.g., $200, _ Application due mid-September Learn results of grant sts October - December, 2008 Heat Recove stem F> s December 2008 - May 2009 Main S ro C. struc 'n April - November 2009 Con ction Heat R } Sy June 2009 -September 2010 VII. Empl nt and tracting Compliance Policy Statements . Both the Town and ct have employment and human relati ons policies which are consistent with state ederal requirements. These include the following policies: • Equal Opportunity and Minority Contractor • Drug free workplace • Employment of Illegal Aliens Both agencies require that the policy be received, read, and understood by all employees, as evidenced by their signature on a copy of the policy which is maintained in personnel records. A copy of each agency's policies on these important items is available upon request. Page 12 of 15 7/16/2008 a, N L 7 bA F6, Vl O c~ N bA kr) w 0 a~ bn END OF DOCUMENT END NOTES: ' U.S. Geological Survey records for past 61 years. Obtained online on February 29, 2008 a1 http://waterdata.usgs.gov/nwis/uv?09070000 ' U.S. Geological Survey records for past 8 years. Obtained online on February 29, 2008 at httl2:Hwaterdata.usgs.gov/nwi s/uv?09067020 3 U.S. Geological Survey records for months of September and October over past 8 ye m percentile values of daily flow rate data. Obtained online on February 29, 2008 at http://waterdata. usgs. jzov/nwi s/uv?09067020 a The Town of Avon began purchasing wind-generated electricity (not credits) from January 2008, reducing their carbon footprint to less than 50% of 2007 leve an n cai consumption is a key goal of the Town of Avon. See Avon's Climate Actio " Ian, S This assumption will be tested during the engineering design phase. 6 Assumes a coefficient of power of approximately 3.0. Page 15 of 15 inimum here is listed at 10`n Holy Cross Energy in bon footprint and energy 7/16/2008 PROPOSAL TO DESIGN AND CONSTRUCT A COMMUNITY HEAT RECOVERY SYSTEM ter- i l: { r~ n t.. ' °,,,w,r;r.~ny ywt~~~•r~ ~ ~,f"rilA>& Py.1" IWO' 9JL \ 1 tt ~r .r.~ t.. .r r T "2- 7-7 3 A COOPEIVE VENTURE AND JOINT APPLICATION BY: TOWN OF AVON and EAGLE RIVER WATER AND COLORADO SANITATION DISTRICT O 1. Summary Eagle River in Autumn Two local entities are working cooperatively to conduct urban renewal, replace aging and inefficient infrastructure, .f, .t and to build a better community in Avon, Colorado. The Town of Avon (Town) is the local government authority who provides services including public works, transit, building permitting, public safety, recreational services engineering, and general government and engineering services. Eagle River Water and Sanitation District (District) provides potable water and collection, treatment, and disposal of wastewater in Avon. The Town Council and the District Board have complementary goals of conserving energy and ' providing long-term operational sustainability to the lpopulation as it grows and develops. This proposal represents a joint application by t] the District to design and construct a waste heat system that will capture solar heat and extract heat from processes for beneficial use in the Avon unity. The biosolids processing at the WWTP, provi e r' the co snow in high traffic pedestrian areas in Ord e pi heat recovery system would be provided by nd-g Cross Energy. The use of wind power and a t ve ter treatment plant (WWTP) 1 be utilized to optimize F w' ing pool, and to melt I p`s ty. Power for the waste r. . purchased from Holy ~twill enable the Town and District to provide a nece . structure i vement al'reduce the carbon footprint compared to current o ations. U her, the pro' t will achieve a reduction in the wastewater effluent temperatur i is curr ly discharge t e Eagle River during fish-sensitive periods. The Town and stri o expect to " e tax and rate payers money as a result of this project as c ared to "7 status quo because it results in a more sustamabl ratio ,r;, is exc' roject will be the first of its kind - to use plant waste the United States. Prelim in gineering an s wasrformed by Town engineering staff who determined that the propose to heat reco project is technically feasible and appears to be cost effective. The proximity e Avon TP to the targeted core pedestrian area and the ability of the Town and Districare r urces have provided the basis for a successful public works project. The Distric eed to locate mechanical and electrical equipment required for this project on the WWTP and to share in the construction and operations cost of the system. The Town has agreed o limit the surface area for snow melt in the urban renewal area to that which can be served by this waste heat recovery system, focusing on only the busiest pedestrian areas. The pool will retain its existing natural gas boiler system for back-up. Both agencies have made a commitment to share in the construction and operational costs of the project in proportion to the benefits achieved. This document provides a description of the proposed project which can be used to communicate with project stakeholders and the public. This document includes the necessary elements of a Page 1 of 15 7/16/2008 grant application, including introductory information, project benefits, technical details, financial considerations, and project management plan and schedule. This project shows how local agencies can work cooperatively for mutual benefit to provide infrastructure which accommodates growth and urban renewal and simultaneously demonstrate strong environmental leadership. II. Introduction Avon, Colorado, located in the heart of the Rocky Mountains, is a strongly dependant on a quality environment and recreation-based at 7,420 feet MSL and has four distinct seasons, including sno November until mid-April. Currently, the population of Av c about 12,000 during the winter months). The population &'r c' average of about 20,000 by 2020. Avon is undergoin a ne, downtown core to eliminate blight and improve eco is conditic attainable housing, and to offer transportation co s to OV The Eagle River is a sparkling clear river supplied from several of Colorado's highest peaks; thi river runs from Tennessee Pass through Avon and disch t an average daily rate of about 565 cfs into the Colora bout 50 miles downstream in Gypsum. i Avon resi is visitors alike depend on the Eagle River in n ero 11.16 ; This river is a designated f eational Use many recreational activities u n " abundant t fishing, white water rafting, d, ayakin g)LJJhis river is b the source of potable v.Ste the re Tent of treat( wastewater for the Town o le Ri continues to essure o a gr The State o ors artm Public Hea about ver's abih ror ceive a Nuastewceive a Nuastew ;r community which is nomy. The town is located inters lasting from mid- i out 7,500 (swelling to d to to a year-round al and i, . ization in the is, provide jobs and ;ional area. Fade River Kav er 757 " r~►~~' AL-P, AMC and Environment has expressed concerns r discharges in the fall and early winter. The Dist erates the A niWasteCater Treatment Plant (WWTP). This plant has an average flow of 2.2 nwpiLn d dischar to the Eagle River in Avon at a point when the average daily river flow rate 1 r ut 316 c During September and October, minimum river flows at this location have been''' de y U.S.G.S. at about 102 cfs.3 Avon WWTP staff has observed effluent temperatures ` a these months that are in the range of 14°C to 1000. For this reason, the District is considering extracting and dissipating heat from plant effluent. The District is also looking at means to pre-heat the wastewater solids prior to stabilizing them in an auto- thremal thermophilic aerobic digestion (ATAD) process. The ATAD process operates at increasing efficiencies and gains capacity with each incremental temperature increase above 50°C. Pre-heating will enable the WWTP to achieve temperatures of 55°C in the first stage of the Page 2 of 15 ERWSD Loading Dock and Driveway 7/16/2008 ATAD (currently the process can only manage 40°C in the first stage). Post cooling the ATAD effluent not only provides an opportunity for heat recovery, but also reduces final solids processing costs by reducing the chemical demands. Post-cooling the biosolids to 25°C increases the efficiency of the biosolids dewatering centrifuges and reduces the polymer demands, increases, centrifuge throughput, and allows for a drier final biosolids product. Thus, not only are chemical requirements reduced, but operational processing times are reduced, and product hauling costs are lowered. If fully recovered, about 1 MW of thermal energy is available between the wastewater effluent and the ATAD effluent. Section IV describes a method that economically maximizes the waste heat recovery. Beyond the need for heat recovery in the solids processing syste e District could use waste heat for space heating and for snowmelt of the driveway and r v ock. This improvement Y would allow the plant areas currently set aside for stockpilin rge pi snow to be made available for other uses, and the District would likely rea o r costs _ iated with plowing. The Districts waste heat demands are unlik o fu utilize all t ilable waste captured from wastewater effluent and the ATAD ess, thu5,;the District ha ed make any surplus heat recovered from the WWTP ava the To of Avon, a nea eighbo: The Avon WWTP is located adjacent to the Town's ur e ~ ea, separate rom town- . . owned land by a Union Pacific Railroad right-of-way. The Town of Avon is undergoing a majo `'ur. Blig ea to be improved by project renewal effort to eliminate blight and stim e economy. One important objective of this e rt is the creation of vibrant streetscapes and multi- od transportation connection -CJr renewal is _ expected to increase t mbe bs and loc - ' live-work arrangem s, sociate ith recreatio - tourism. Winter touns h eci strong, as ` visitors come to Avon's a lodges and hile s and sn ding at nearb eas inclu ail an ' ver Creek. In the d wn core area von t n traffic is big the winter, m pedest 'Y ns wear ski boots and carry sports equipment. Snowy Page 3 of 15 and icy su c create slippi and lling hazards, increase the Town's insurance claims, and work against oven's goa s f creating a vibrant streetscape. For this reason, a snow melt system for the st sidew s, and paths was incorporated into the urban renewal project over a relatively large ar , 0 sf). The Town considered either natural gas fired boilers or ground loop pumping atives that would have consumed approximately 348,000 therms of natural gas or 3,620,0 kW-hrs of electricity, respectfully. The least cost option (natural gas boilers) was estimated to cost approximately $4.45 million to construct and about $650,000 per year to operate and would have emitted more than 2,100 tons of carbon dioxide into the atmosphere. After recently taking bold actions to reduce the Town's carbon footprint via purchase of 100% wind-generated electrical power as wind power in January 2008, the Avon Town Council voted against pursuing the large snow melt streetscape and sought other options to fulfill urban renewal goals in a more sustainable manner.4 7/16/2008 Mr- Current and Proposed Future look of Streetscape in Avon's Ur ell~j Area (note snow melt system in use on right) District and Town staff met informally in January 2008 u pro\TowDistrict, an renewal efforts. Staff identified this sustainability initiative win-win for tthe Eagle River, and local residents. This project will result in economic benefits to III. Project Statement and Benefits both agencies. An after-project operational savings of about $20,000 per year has been This project proposes to use a combinati estimated for the District and the Town will save waste heat from the wastewater plant and about $77.000 ner year for the Town. thermal water heating as the prime energy s rce ste heat r.., , very system that provides snow melt in core pedestrian and high-risk a s in G the community recreational center, and within the WW ino cesses. Dun nter sto or at night when solar energy is insufficient for the sno e d or canno eet requir d snow melt system temperatures, backup natural gas b would e tarted. The ste heat in the effluent would be transferred using a heat-pump yst ower y renewable -generated electricity. Between the solar thermal and the heat-pum e n foo nt of the system is significantly reduced compared to techn o 'es. o melt demands are by nature seasonal and wastewa rocess ands Y ess than the available heat, surplus heat could for most of the ye e used to supp ' ry t tot , hot tubs, and showers in the recreational center. This wo icantly reduce town's ent carbon footprint. This project the opport, ity to showcase how common process technologies and mechanical co nts can applied in a unique way to solve several problems facing communities toda er e many facilities in the U.S. that shed waste heat without obtaining any benefit from it. a ecovery systems such as the one proposed here have a wide application. This pro' t will demonstrate the degree of energy efficiency available with current heat recovery technology. It would be the first of its kind in the United States with respect to the use of waste heat from a wastewater plant for the creation of a snow melt system. The project demonstrates the range of options available to local governments and agencies that are willing to work together and apply creative engineering solutions to address difficult issues including climate change, urban renewal and limited resources. At the local level, this project has very direct and exciting benefits, including: Page 4 of 15 7/16/2008 • The Town is able to improve the safety and vitality of core pedestrian areas with a limited impact on the Town's current total carbon footprint. • The Town could reduce natural gas purchases for the recreational center from 10,800 decatherms per year to approximately 3,200 decatherms per year. This translates into a savings of $77,000 annually in natural gas costs and a reduction in carbon footprint of over 600 tons per year. • The Eagle River benefits when the effluent temperature is reduced prior to river discharge, improving river temperatures for fish spawning. • The District will increase the cost-effectiveness of solids treat rocessing by reducing expensive polymer consumption and increasing bi ids ke dryness. Assuming a 50% reduction in polymer usage results, the ct could realize an annual savings of about $20,000.5 • The District benefits by reducing their plant site ar a ently 't., snow storage and reducing the risk of back-up of the plant drain a - ater sep '`°'t systems. As compared to other projects competitively this project includes: grant %p r support, • Multi-agency cooperation • Environmental leadership • Reduced carbon footprint operatio • Improved river water temperatures fis • Reduced risk for liability claims (fro p • Installation of the ftsgt em of its typ • Urban renewal blig e rea • Tangible ne' b ood bee it provided b IV. T L", U.S. wastewater treatment plant Figure 06ers a dra e of t ` - posed heat recovery syste cess flow scheAi4 Fig 4' ows the project site and cal locations. a para train of mechanica ment consi g of one plant effluent pump, one he p compr sf or, and one glycol pump is VMJ anticipated to ca waste at from the plant and transfer it to glycol ping. Only a portion of the plant's final effluent a maximum of 1,040 gpm (1.5 mgd), would be pum d through the heat recovery system and none of this effluent would ever leave the plant property, eliminating concerns about water rights. The portion of the effluent which is cooled through the heat recovery system would be blended back with the remainder of the effluent in the final effluent discharge piping, and would flow to the river outfall. Heat would also be recovered from the wastewater treatment plant's ATAD system by pumping the hot sludge through a glycol to sludge heat exchanger. Page 5 of 15 7/16/2008 ATAD process stream piping river outfall. Heat would also be recovered from the wastewater treatment plant's ATAD system by pumping the hot sludge through a glycol to sludge heat exchanger. Due to severe winter weather and existing space limitations, the waste heat recovery system must be housed indoors in a new building. Most of the year and during the daylight hours, the system's heat would be provided by a solar thermal hot water system. Under peak heating demands, a natural gas boiler could be operated to provide supplemental heating to the system. The solar thermal system and the supplemental boiler building could be located on the Town property and potentially on or in the recreational center. The glycol supply (GLY-S) and return (GLY-R) piping operates in a closed-loop configuration. This piping would be located within the plant site to deliver heat to the District's on-site snow melt system and would extend off site into Town-owned right-of-way and connected to the snow melt system in public pedestrian areas. A pair of 8-inch diameter pipes would be installed and located approximately as shown in Figure 2. The piping would be insulated and buried at least 4 feet deep to be below the frost zone and to minimize heat losses. The distance between the plant and the Town's pool and snow melt connection is approximately 1,700 LF; most of this distance is in the grassy area along the south side of Benchmark Road. The pipe alignment includes one crossing under a Union Pacific Railroad. The Town does not expect difficulty in obtaining a utility easement for this crossing. Once fully completed, the heat recovery system would reduce the effluent temperature for the processed effluent flow of 1,040 gpm by approximately 4°C (e.g., from 15'C to 11°C). The temperature in the final stage of the ATAD system could be reduced from 54°C in the previous stage to about 40°C. The closed glycol loop would have a flow of about 750 gpm and would operate at a temperature differential of approximately 12'C between the GLY-S and GLY-R (e.g., from 55°C to 43°C). Page 6 of 15 7/17/2008 ~r I LM .i~ tr l 33wti {k6 2 s. GP .:1ffi'a 174 dr s s t Cs i i LLJ © ~ t9 0 O~ u. LIJ Z w U 'S d U. N co w 0 We Q» x N r n at:ta. `W;e'9'±: SO i uJavtJ~-, i~?^b`;3Sk^:1;5 Cam. 0 41 cC a - z v ~ O U ~w Cf! hQ =W UZ 2a w U Cn J LL. to cn w U 0 w o. cc 0 0 N r r- [l tf) v by RS CL. The system control would be analogous to similar systems. Moisture and temperature sensors at the pavement surfaces would call for increased pumping rates when snow begins to accumulate. The temperature of the glycol loop would be monitored against pre-selected temperature set points and would be used as a trimming signal to ensure a smooth operation. The thermostat on the heat pump and backup boiler would be connected to the glycol temperature measurement system. The District would add this system to its existing supervisory control and data acquisition system (SCADA), allowing for display on the operator's terminal. Back-up power would not be necessary for this system. In the event of a power outage, the system could be manually re-set when grid power is restored to the plant. 'Itk The system in its entirety is sized to provide a maximum of 2, does not include the solar thermal system that has a capacity c clear sky daylight conditions. Approximately, 1100 kW-thetl heat pump to the GLY loop and the backup boilers woulAR thermal as needed. A minor amount of heat would the GLY loop. The heat from this system would provide up to 30 W/s approximately 75,000 sf. At present, the expected uses 'x the District's plant and about 65,000 sf ted in the Town 146 kW of energy is provided for peak A ":A dge pre-h 316 kW-thermal would meet the daytime p demo year. ^-thermal of energy. This thermal, under typical of ens" is provided from the an ad 1 1200 kW- ed from th8V,%END system to f) of snow4e'lt energy for about 10,000 sf located at n areas. An additional k ds. The solar output of t 9 to 10 months of the This project allows the Town to meet both its sustainability goals and achieve urban renewal The total electrical dema tion for the equipment on this sys (e.g., ins housed with a safer and more vibrant streetscape. ' the new pump stati on ) is estimat to e about 500 kW.6 Operation of the system will consume ap ate 160,000 kW of wind-generated electricity annually. Of this electrical approx a - of this electricity will be for running the heat pump on c at mainta " of demands and provide pre-heating to the ATAD cess. The to will 'e;_ proximately 3,170 decatherms of natural gas per year and prod otal of 190 to ` p year on emissions. In comparison, the Town of Avon pure as a roximately 10r, 0 dec erms of natural gas for the recreational center from January thr November, 1 Ob7 and released approximately, 567 tons of carbon emissions over the same time d. The prsed hybrid heat pump, solar thermal heating, and supplemental natural as boile in w d eliminate natural gas purchases for the recreational center except under times of sigm . ow events. V. Financial Considerations Capital Costs The planning level estimate of probable cost for this system is approximately $3.68million to plan, design, and construct (July 2008 dollars). This estimate does not include costs for the Town's street revitalization projects on Lake Street and Main Street or the District's cost to reconstruct their driveway and loading dock to install snow melt piping. These excluded costs Page 8 of 15 7/16/2008 would be born directly by the respective agencies. A breakdown of cost components is shown in Table 1. The Town and the District have agreed to split the design and project administration costs (i.e., "soft costs") equally, with each agency paying 50%. The agencies have allocated a maximum of $90,000 each ($180,000 total) to complete engineering design to a 30% level in 2008. Additional funds will be needed in 2008 and 2009 to complete the design. The agencies are applying for grant funds to be used for the construction phase. Assuming that a significant portion of the target grant funding is obtained, the two agencies have a ed to pro-rate the remaining costs (i.e., all non-grant funded costs) in proportion to the , achieved. An even project cost split for construction costs has been assumed in Tabl or discussion purposes. Grant Eligibility The agencies are seeking grant funding up to 80% of local match. The following potential funding partner thus far: ,0 • Water Environment Research Federation' • State of Colorado - Governor's Energy Office • Federal Government o Department of Agriculture ble Energy Improvements • T• ,14 Department of Agriculture C ervat o Department o . nergy State E g • Holy Cross Ener • American Pu orks s ciation • StEPP Fou a r,. trate nvironment g • Turner Foundatio with 20 `iprovided as a sources ha n identified Energy Efficiency Projects ect Pipeline) 7/16/2008 Table 1. Estimate of Probable Ca ital Cost Component Capital Cost Engineering and Fees A/E Fees (10%) $327,337 CM fees (2%) $65,467 Surveys and Tests (0.5%) $16,367 Permits and Fees (0%) 0 Subtotal 1 Construction Cost Heat Pump Building 00 Boiler Building sg,%N, Glycol Pumps 2 700 m $120, Wastewater Effluent Pumps 1 350 m $50,000 ATAD Preheating Pumps 2 $40,000 Heat Pumps 1 $103,000 Heat Exchanger 2 $60,000 Boiler ` $60,000 Solar Thermal Heating System $200,000 GLY Pie 3400 LF 8" sch80 PVC, double-walle long r.o.w. N 8,000 Jackets, Insulation, pipe supports I;r$61,200 Electrical 500 kW service, transformer, motors, swi $400,000 Instrumentation and Controls $100,000 Equipment ads and misc. $40,000 I'll Site Civil r`_ $50,000 Miscellaneous Piping n ctions r` $100,000 N 21S, Subtotal $2,017,200 Contingency . ? $504,300 ubtot stuction Cos with Contingency N $2,521,500 I*r Ge tractor's Overhea "an Genera itions A N 18% $453,870 General N-Nctor's Profit 11. $298,000 Total Construction Cost $3,273,370 nd Total $3,682,541 Y Operating and Maint nance Cost The cost estimate to operate the heat recovery system at the Avon WWTP is approximately $192,000 per year (July 2008 dollars). A cost-sharing agreement has been developed between the authorizing agencies as follows: The Town pays for operation of the heat recovery system throughout the year; the electric meter would be assigned to the Town. This allows the agencies to use wind-generated electricity that the Town purchases from Holy Cross Energy to power the system. Page 10 of 15 7/16/2008 • The District contributes funding annually to the Town's general fund to compensate for electric power to run the system during months when snow melting is not necessary but when the District elects to shed waste heat. (Snow melting is generally necessary only from November 15`h through March 31 S') • The District provides the land, indoor building space, utilities and control system connections (excluding electricity), and plant inter-ties for mechanical and electrical system components at the Avon Wastewater Treatment Plant. • Maintenance of the system is conducted by District staff and bi to the Town of Avon at cost. VI. Project Management Plan and Schedule This is a two-agency project to be conducted by the To a he District. e, fifer Strehler, Director of Public Works for the Town, and Chris es, Wastewater Opera Manger for the District, will execute this project cooperative ifer an4 Chris are works ether to develop the final project plans, communicate with int " en Ai~g staff and c . sultants, report to the District board and local Avon leaders on proi V and manage the project's overall scope, schedule, budget and quality. C is under a dual F' ct by the Town and District to provide engineering predesign and desig ces for this pro e, , Contact information for the agencies and thbkngonsultan as follows: . able 2. Co Town of Avon z~ *le River ter and nitation Dist Consultant Jennifer Strehler P.E. Scott Vandenburgh Director of , ;o Wastew ' ivision Manager Project Manager 500 Sw' ulch Roa r, Forest Road 11811 NE 15t Street, Suite P.O. 75 ` 81657 201 Avo 20 ) 477-54 94 Y Bellevue, WA 98005 Tel: (90) 100 70) 477-5434 FX: Tel: (425) 519-8399 FAX: (970) <z 58 cmaines(&erwsd.org FAX: (425) 646-9523 htrehler aVon. vandenburghsrgcdm.com The construction pha/s will be competitively bid, with award to the responsive and responsible general contractor who offers the lowest monetary bid. The Town would take the lead on awarding the contracts for construction and managing project financing and payments to contractors, with the District acting in a repayment capacity for shared-cost items and providing on-site inspection of the mechanical and electrical work conducted within the Avon WWTP property. A project schedule is shown in Table 3. A Site Plan of the Facilities is shown in Figure 2. The physical layout of the construction is shown in Figure 3. The total project would consist of Page 11 of 15 7/16/2008 construction of the heat pump facilities at the WWTP, construction of the glycol loop between the new heat pump building and the Avon Station, installation of the supplemental natural gas boiler and the solar thermal system, and connections between the glycol loop and the existing recreational center. The Avon Station is a multi-modal hub which connects car, transit, pedestrian, bicycle, gondola and a future light-rail link. A snow melt system (about 25,000 sf in area) is already in place under brick pavers at Avon Station. Additional pavers will be added down Lettuce Shed Lane by the Town in the near future. Expansion of the snow melt system from Lettuce Shed Lane toza east and west to plaza areas and sidewalks located along the Avon's new Main Street wou , made in this project. Since Main Street will be built in 2009, the Town intend anually remove snow for the first winter season until the new heat recovery system is in c Table 3. Proposed Project Sch Activity Date Heat Recovery System Engineering Prelimina ' ~ In progress Main Street Project Design ~ progress Submit grant request to Colorado De ent of Local A€f Letter of Intent submitted 7/18 (CDOLA) for New Energy Communit iative Grant (e pplication due 9/19 $2,000,000) , Submit grant request to Water Environme Rese h-_ d ue July 29, 2008 b (WERF) (e.g., $200,000) Submit grant request t "Governors ergy Offic Pro Forma due 7/24 (GEO) (e.g., $200, Application due mid-September Learn results of grant sts " October - December, 2008 Heat Recove stem Fi s December 2008 - May 2009 Main S ro C struc h, ' April - November 2009 Conction Heat N Sy June 2009 - September 2010 VII. Empl nt and tracting Compliance Policy Statements Both the Town and ct have employment and human relati ons policies which are consistent with state aVKederal requirements. These include the following policies: • Equal Opportunity and Minority Contractor • Drug free workplace • Employment of Illegal Aliens Both agencies require that the policy be received, read, and understood by all employees, as evidenced by their signature on a copy of the policy which is maintained in personnel records. A copy of each agency's policies on these important items is available upon request. Page 12 of 15 7/16/2008 C CC N L bA Fes, V'1 4. O c~ N bq c~ a 00 0 0 N 1-0 i:z kf) 0 U to a END OF DOCUMENT END NOTES: U.S. Geological Survey records for past 61 years. Obtained online on February 29, 2008 at http://waterdata.u sgs. y-ov/nwi s/uv?09070000 ' U.S. Geological Survey records for past 8 years. Obtained online on February 29, 2008 at http://waterdata.usgs.gov/nwis/uv?09067020 3 U.S. Geological Survey records for months of September and October over past 8 ye m percentile values of daily flow rate data. Obtained online on February 29, 2008 at http://waterdata. usgs. Qov/nwis/uv?09067020 4 The Town of Avon began purchasing wind-generated electricity (not credits) from January 2008, reducing their carbon footprint to less than 50% of 2007 leve an " n at consumption is a key goal of the Town of Avon. See Avon's Climate Acti an, S t. This assumption will be tested during the engineering design phase. e Assumes a coefficient of power of approximately 3.0. Page 15 of 15 inimum here is listed at 10`h Holy Cross Energy in bon footprint and energy 7/16/2008