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Ashland Wastewater Treatment Plant Effluent Outfall Relocation Project

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Ashland Wastewater Treatment Plant Effluent Outfall Relocation Project PROPOSAL Ashland Wastewater Treatment Plant Effluent Outfall Relocation Project Project Number: 2013-21 Prepared for City of Ashland AOregon Prepared by February 2014 Ashland Wastewater Treatment Plant Effluent Outfall Relocation Project 1. Project Understanding & Approach meet spawning temperature restrictions at the new outfall site. CH2M HILL will work with the City of Ashland to deliver a cost‐effective integrated thermal solution to meet For Ashland’s outfall project, an implementable solution temperature compliance requirements for the will need to achieve the following benefits: permit wastewater treatment plant (WWTP). CH2M HILL and its compliance on the stipulated schedule; low capital and team understand the public context associated with O&M costs; minimal disturbance to adjacent open space important public space and waterways around the resources; and support by the community and WWTP and will develop an approach that will facilitate regulatory agencies. Our team’s understanding of key streamlined permitting and community support. resources and community issues around the WWTP (Figure 1‐1) will help Ashland achieve these project Project Understanding benefits. The current National Pollution Discharge Elimination CH2M HILL project teams have a long history delivering System (NPDES) permit for the Ashland WWTP expired implementable solutions with excellent results in the in 2008 and the Oregon Department of Environmental Pacific Northwest. Our previous successes with outfall, Quality (DEQ) is planning to initiate the NPDES permit effluent temperature, and constructed wetland projects renew process in fall 2014. The renewed NPDES permit across Oregon demonstrate our track record. We will will include requirements for effluent thermal load and exceed Ashland’s expectations for its outfall project copper limits at the point of discharge, considering using our team’s knowledge and experience gained from mixing zone dilution. Compliance with the new limits will similar projects. Our team, including Keller Associates be required within five years of permit issuance. and The Freshwater Trust, will manage all phases of the The new requirements create several challenges for the project from planning through permitting, design, Ashland Creek outfall, which has limited dilution during construction, and operation. Our site‐specific knowledge low flow periods. Relocating the outfall from Ashland of the Ashland WWTP, Ashland and Bear Creeks, and Creek to the higher‐ flow Bear Creek would eliminate the surrounding resources, as well as our relationships with current temperature impacts to Ashland Creek, while local agencies and community leaders, will help us reducing the need for effluent cooling to address navigate towards a cost‐effective solution that agencies migration blockage, thermal shock, and spawning readily approve and the community embraces. impairments. A Bear Creek outfall location would also Project Approach provide greater dilution and a better mixing zone This section includes key factors to help achieve project environment to meet restrictions on copper and other success through Phase 1 of the outfall project. effluent constituents. However, even with an outfall relocation to Bear Creek, effluent cooling (by up 1.5 to Integrated Thermal Solution: Our approach will include 2 degrees Celsius in September) would be required to project alternatives that address both near‐ and far‐field avoid a migration blockage condition. In addition, during thermal load and temperature mitigation requirements. low flow portions of the spawning period (October 15 We will begin by developing solutions that meet the through May 15), effluent cooling may be necessary to near‐field temperature limitations (i.e. migration FIGURE 1‐1. Key Considerations Natural resource and community constraints and opportunities around the WWTP will be clearly identified to develop project solutions and to navigate towards a streamlined permitting approach. Our involvement with other projects such as the Bear Creek BiOp will also be valuable in building an understanding of future flow regimes and dilution. WBG021414202951PDX 1 Ashland Wastewater Treatment Plant Effluent Outfall Relocation Project blockage). In parallel, we will quantify the temperature Task 1.2. Preliminary Flow, Temperature, and Dilution benefits that can be applied to reducing far‐field thermal Analysis: Flow and temperature data from Bear and load obligations. Our approach will ensure that the far‐ Ashland Creeks and Ashland WWTP will be analyzed. field temperature mitigation (planned through riparian Heat Source Wetlands (HSW) models of Glendower restoration) accounts for benefits already delivered from Pond (open water pond) and densely vegetated the outfall relocation and wetland cooling projects. constructed wetlands will be developed using Ashland Streamlined Permitting: Our team will approach key climatic data. Temperature results will be used to guide permitting agencies early in the project, to streamline initial sizing of pond/wetland areas needed to meet the process of creating implementable solutions. Early temperature standards. The DEQ analysis of dilutions to engagement will provide a short list of project avoid migration blockage and spawning impairment will alternatives that the agencies are more likely to support, be updated. that will avoid significant permitting challenges or Task 1.3. Project Alternatives Definition: Using the mitigation requirements, and will decrease project information from Task 1.2, a range of options will be compliance costs and schedule risk. Challenges such as identified that can technically meet the water quality construction disturbance and mitigation for impacts to criteria for near field temperature impacts. jurisdictional wetlands or waterways, floodplain impacts, Task 1 Deliverable: Technical memorandum summarizing and opportunities for developing artificial wetlands and modeling and list of identified alternatives. ponds that are exempt from the requirements, will be addressed early in the project definition phase. This Task 2. Natural Resources and NPDES Permitting approach was applied successfully for the Albany, RUSA, and Woodburn projects described in Section 3. Task 2.1. Preliminary Environmental and Permitting Supported by the Community: Our team joined the Analysis: Using the results of Task 1.3, a preliminary community in preliminary discussions on outfall environmental permitting analysis will be conducted to relocation options, where we gained a keen identify potential environmental constraints and understanding of the community’s sentiments and approvals/permits needed from local, state, and federal values for certain open space assets. We recognize that agencies (DEQ, Jackson County, USACE, USFWS, NMFS, Ashland’s success through this project depends on DSL, SHPO) during Phase 2. Available information will be developing temperature and outfall solutions that utilized; all required approvals, permits, and Phase 2 enhance the aesthetics, recreational, and educational studies will be clearly summarized; and a permitting opportunities surrounding the WWTP, without strategy will identify opportunities for impact avoidance restricting current public uses of Glendower Pond and and potential mitigation. other open space assets. We will work with the City to Task 2.2. Preliminary Wetland Delineation: Delineate deliver a project that provides not only short term regulatory wetlands and waters within the defined support but long term value. We will build this support boundaries of the study area. The task will include the through meetings with the Ashland Parks Commission, background research, field work, and preliminary neighborhood associations, and an on‐line web wetland mapping to inform the preliminary design presence. process. Completion of the wetland delineation report Preliminary Statement of Work and submittal to agencies will occur in Phase 2. Our team has developed a preliminary statement of Task 2.3. Agency Pre‐Application Meeting: Following work that accomplishes the requested tasks through the the completion of1 Task 1, 3. and a draft level completion of Phase 1. A Gantt chart with major work completion of Task 2.1, 3.2, and 3.3, we will hold a pre‐ tasks, milestones, and durations through Phase 1, for application meeting with key agency staff to solicit input completion by October 1, 2014, is presented in on the planned project elements. Results of this meeting Figure 1‐2 at the end of this section. will inform the completion of Task 2.1 and the identification of conveyance routes and wetland Task 1. Project Definition and Preliminary Analysis locations to be incorporated in Task 3. Task 1.1. Project Initiation: Attend kick‐off meeting with Task 2 Deliverables: Technical memorandum and the City to confirm project goals and success factors, meeting notes for incorporation into the predesign communication protocols, and key project stakeholders. report. Additionally, we will discuss priority issues that have been raised by permitting agencies, the parks commission, stakeholders, and the public. 2 WBG021414202951PDX Ashland Wastewater Treatment Plant Effluent Outfall Relocation Project Task 3. Preliminary Design members will present project proposals for discussion and will document public comments. Presentations are Task 3.1. Field Data Collection: Obtain data required to planned for at least one Ashland Parks Commission and support the outfall mixing zone dilution study and one City Council meeting. preliminary
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