Architect’s proposed rendering of the Danville WTP renovation and expansion
September 2012 – As design nears 100% completion, the final touches are added to the water plant design. The last steps of design are finalizing some architectural pieces, such as a nice looking security fence, to serve a dual purpose of providing extra protection and giving a nice aesthetic appearance. The black steel fence provides helps to provide an ambience that fits with the original 1920’s architectural features on the existing plant.
August 2012 – Process and structural engineers have reviewed the original design concept to protect the raw water intake line from potential rock falls. Due to possible structural issues with backfilling against the existing intake building, the rockfall protection concept was reconsidered, and a new approach is being taken. Using a passive rockfall system, steel mesh is draped over the most susceptible areas to prevent large boulders from falling and rolling into the raw water intake building or pipeline. See the Project Photos section for additional information.
July 2012 – A full set of plans and specifications have been submitted to the Kentucky Division of Water (DOW) for approval. DOW will review the plans to ensure the design is in compliance with the applicable standards (most notably, Ten States’ Standards) and check the specifications are consistent with the funding requirements.
June 6th 2012 – Website updated. Project Photos have been added of the recent elevated water tank demolition.
May 9th 2012 – Website updated. Project Photos have been added to show 3D views of various sections of the plant.
May 8th 2012 – The Kentucky-Tennessee American Water Works Association has selected the Danville WTP as a project to highlight during the annual Water Professional Conference held in Memphis. HDR project managers Brent Tippey and Rich Smith will present along with city engineer Earl Coffey and chief WTP operator Andy Tompkins. These four will present the various investigations leading to the selection of GAC contactors for Stage 2 D/DBPR Compliance. The abstract can be viewed here.
April 18th 2012 – Disinfection is at the heart of every water treatment plant. Using just salt, water, and electricity, the Danville WTP currently produces sodium-hypochlorite (mixed with other lesser oxidants) with existing MIOX generators. The design team has been working with MIOX representatives to upgrade and expand the existing MIOX system to the newest self-cleaning MIOX system. Self-cleaning is a major innovation in the oxidant generation market. Maintenance is important to extending the life of the MIOX equipment and the self-cleaning ensures that important, routine maintenance is performed on schedule. The new design will likely utilize three 300 pound per day self-cleaning units. Additional information on MIOX is available here. The current design for the chemical building layout is available here.
April 2nd 2012 – The design team has completed an updated Hydraulic Profile for the new WTP. The view shows the various water elevations in the plant as it travels through different treatment processes. The full profile is available under Project Photos.
March 12th 2012 – Final design reached a milestone with the presentation of the 60% drawings for review. The drawings were another milestone in the final design of the WTP. Using previous comments, the design team was able to reach consensus on major design decisions and move from large conceptual drawings to more detailed drawings. On many large water projects the 60% milestone is a point where sub-disciplines (such as HVAC, plumbing, electrical, etc) increase their involvement on the project and begin large-scale production of their discipline’s construction drawings.
February 12th 2012 – The Advocate-Messenger reports on the WTP expansion project. Full article is seen here.
February 2nd 2012 – Engineers and architects from the design team met with citizens of Danville that comprise the Architectural Review Board for the WTP project. The review board is tasked with ensuring the design team continues to uphold the look and feel of the original WTP. Throughout the duration of the project, communication between the review board and the design team will ensure the architectural goals of the project are met.
January 16th 2012 – Final design reached a milestone with the presentation of the 30% drawings for review. The drawings were the first submittal of drawings from HDR to the City of Danville. Comments from the city will help the design team as we head towards the next milestone, the 60% review.
September 26th 2011 – The HDR Project team delivered the Preliminary Engineering Report to the City of Danville. Project manager Brent Tippey (HDR) spent time with the mayor and city commissioners reviewing the report and highlighting the findings and recommendations. As part of the preliminary phase, updated construction and project estimates were established (more information available here). To download a copy of the “Executive Summary” of the report, click here. Updated renderings of the project are also available in the Project Photos section.
September 9, 2011 – City of Danville staff Earl Coffey (city engineer) and Andy Tompkins (WTP chief operator), along with HDR engineer Rich Smith, visited the Toyota-Georgetown Wastewater Treatment Plant. The purpose of the trip was to get a first-hand look at pressure granular activated carbon (GAC) contactors. Pictures taken can be seen here.
GAC is a technology the city of Danville is currently considering. Although the GAC contactors are installed at a wastewater plant, the operation and maintenance of the GAC pressure vessels is very similar to a water treatment plant operation. Going forward, the valuable lessons learned from this trip and similar trips will help the project team choose the technology that is best suited for Danville.
August 9, 2011 – HDR design team members, City of Danville staff Earl Coffey (city engineer), Andy Tompkins (WTP chief operator), and Commissioner Gail Louis, along with representatives from the Kentucky cities of Williamstown and Cynthiana made the trip to Indianapolis to the state-of-the-art T.W. Moses Water Treatment Plant to evaluate the new water treatment technologies that had been installed.
The primary goal of the trip was to review the process known as Actiflo™ Carb which is being considered for implementation at the Danville WTP for clarification and organics control. This process is an adaptation of the patented Actiflo™ process known for its high settling rate to small footprint required. In addition to the benefits of Actiflo, PAC (powder activated carbon) is added to the process to aide in the absorption of organic matter in the water. (Brochure available here)
The trip was worthwhile and exposed the attendees to many of the design and operations aspects of the Actiflo Carb. The Actiflo technology is well established in Kentucky for clarification but the addition of the organics control element is a new feature that offers significant promise. The Moses plant in Indianapolis is the first installation of this technology in the United States and has been operational for approximately 9 months. The process does have approximately 10 installations in Europe where it was developed. As the preliminary engineering phase nears an end, the information learned from this trip and similar trips will help the team choose the best treatment technology for the City of Danville WTP when considering cost, performance, durability, operational requirements and regulatory security.
July 29, 2011 – The city of Danville’s City Engineer, Earl Coffey, and chief water plant operator, Andy Tompkins, made the trip with HDR design team members to the Greater Cincinnati Water Works Miller Water Treatment Plant. The Miller Plant serves most customers in the GCWW service area and has been nationally recognized for water quality. The main purpose for this site visit is to observe the facilities and operations of one of the largest granular activated carbon (GAC) plants in the country. The Miller plant is a 240 million gallons per day (MGD) facility and was one of the first municipal facilities in the country to utilize GAC in the treatment process. The GAC process has been successfully in operation in Cincinnati since 1985. More detail on this facility is available at the following link.
The Miller facility has a track record of excellent reduction in total organic carbon (TOC) levels through their treatment facility. Typical reduction levels average around 60% with approximately half of that occurring across the GAC contactors. This level of reduction is comparable with the treatment goals for Danville’s water plant. One unique feature of the Miller plant that is regenerates its carbon material on-site in a multi-hearth furnace that is owned and operated by Cincinnati employees.
Danville is currently considering GAC as an enhancement to their current treatment processes when expanding the plant. GAC will help ensure long-term compliance with Stage 2 DBP Rules implemented by the EPA.
This was a beneficial trip for the design team as they were able to speak with Miller WTP staff and learn about their experience with GAC. Some specific information that was gained include:
- Methods of GAC material handling and transfer
- GAC regeneration operational cost and permitting requirements
- Monitoring parameters to assure efficient operations of the process
- Annual costs of operations for this facility
- Lessons learned about shortcomings of their facility and recommendations for other facilities
This experience and knowledge will help guide decision making process when ultimately determining the final design technologies. Pictures with additional information have also been updated here.
July 12, 2011 – Website Launched. Slide show from the public meeting can be downloaded here.
June 1, 2011 – Preliminary Design Phase Begins
May 23, 2011 – HDR Selected as Design Engineers