Town Council approved Resolution No. 2018-091 on Tuesday, September 25 authorizing the creation of the Picture Rocks water treatment campus capital project and the Airline/Lambert water treatment campus capital projects. View the proposed project timeline here.
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The 90% plan submittal was received by Marana Water in the last week of August and review began immediately by all team members. This includes the careful review (see June/July update) of every detail included on over 330 drawings and over 1600 pages of specifications. Because the water treatment campuses will be constructed at existing facilities that must remain operational during construction, the design also incorporates additional components such as additional piping and valves to minimize service interruptions while connecting the new treatment systems to the existing facilities. In fact, most tie-ins on projects like these will take place at night so most customers won’t notice any change in service. These tie-ins, as well as start-up and commissioning, will follow plans called MOPOs (Maintenance of Plant Operations), to ensure that tie-ins and start-up goes smoothly. MOPOs are comprehensive plans developed in well advance of a specific task that focus on preparedness, safety, and proper execution when construction interfaces with an operational facility.
Because we are at a 90% completion of design, many of the treatment components and larger pieces of equipment have been identified based on performance requirements. This includes the ultraviolet treatment/advanced oxidation equipment (UV/AOP) for destruction of 1,4-dioxane, the vessels and media for treatment of PFAS, and electrical and control equipment. Because these are not typically “off-the-shelf” items and often take weeks or months to procure and manufacture, GMP 1is being issued solely to procure these long-lead items (see previous updates for discussion on GMPs). A second GMP will be issued for the balance of the project, including all other equipment, materials and the onsite construction. The construction schedule will be built to accommodate delivery and placement of these items upon arrival.
During the past two months, the Marana Water team has been detailing out the conceptual designs presented in the preliminary design report we received in April/May. The team is working toward a 60% design completion, and this is where the majority of the design takes place. This process addresses every aspect of the design and operation of the water campuses.
What gets reviewed? Well, each part of the construction and design. Each requirement from the type of fill (dirt) needed, to electrical control panels and nuts and bolts used on the construction site. These items can be explicitly stated on the plans or are outlined in the technical specifications to be used on the project. Equipment manufacturers are included in these discussions to make sure equipment will meet the design requirements. Area is measured and verified to ensure delivery vehicles have appropriate room to enter and leave the site for operational needs. Structural engineering calculations and designs are done for pads that will support equipment and the walls on the site. There is a review of the impact the new sites will have on the surrounding area and confirmation that all safety requirements are met. Other aspects are verified like the hydraulic calculations, that they site layouts will allow for staff to access equipment for maintenance purposes, and the contractor provides a constructability review stating that it can be built as it is designed. The team even selects the paint colors.
Marana Water has reviewed the 60% design in late June and provided comments back to Carollo. Our contractor, Archer Western, has begun to put cost estimates together based on the 60% design. They will discuss with vendors to secure bids for equipment and labor, while Carollo incorporates the comments and continues work toward a 90% design. Both sites are scheduled to begin construction in Fall 2019 with start-up testing in late July/early August 2020. We anticipate both sites to be fully operational in September 2020. We have updated the schedule found at the link at the top of the page as well as below.
During the past two months, our engineering consultant, Carollo Engineering, completed a draft preliminary design report (PDR). This report includes proposed site layouts, preliminary equipment sizing, and treatment process selection. The Marana Water team has reviewed the PDR and the overall project is moving toward 60% completed design. Additionally, as planned, in April interviews were conducted to select the construction manager for the project. After the competitive process, Archer Western Construction was selected as the most responsive and capable firm. Archer Western is a large construction firm with offices located throughout North America, and our team will be working out of the Phoenix office. They have completed several water treatment projects in the Tucson and Phoenix areas, and have experience working with Carollo Engineering. Finally, the contract for preconstruction services, which includes constructability review, value engineering, and cost modeling, is nearing completion. Constructability reviews allow the contractor to evaluate step-by-step construction methods necessary to build a facility alongside the design engineer, providing the opportunity for reduced costs. Value engineering is a term used to improve a product’s value, or the ratio of its function to its cost. Some examples would be a substitution of materials that meet the specific requirements, but are available at a reduced cost, or the use of a different type of pump that operates at a higher efficiency, which could in turn generate operational savings over its lifetime. Archer Western has begun working with Carollo and Marana Water to keep the project on schedule. Once the cost model is complete, it will be used to create the Guaranteed Maximum Price (GMP) process to get equipment that could take a long time to order and be delivered, ensuring these items are available for installation.
To the right is an example of the recommended treatment process that we will use at the water treatment campuses. You can click on the image to enlarge it. First, water is pumped from wells through a series of filtration units to remove sediment or solids that are sometimes found in groundwater. Next, the unregulated compounds treatment process begins with an ultraviolet advanced oxidation process using hydrogen peroxide (UV AOP - H2O2). This means that hydrogen peroxide goes into the water ahead of a UV light. Once this water mixed with hydrogen peroxide passes through the UV light, hydroxyl radicals are generated. These radicals react with and break down the 1,4-dioxane to create harmless molecules of carbon dioxide and hydrogen. After the UV AOP process, the water moves to vessels filled with granular activated carbon (GAC). These GAC filters will absorb the PFAs and any remaining hydrogen peroxide from the UA AOP process. Finally, the water will be disinfected using chlorine and pumped into the reservoir and then the main distribution system for our customers. These two processes together are the most common and proven technologies of treating for1,4-dioxane and PFAs.
The project is moving along during the February and March periods. Our engineering team, Carollo Engineering, continued with the preliminary design of the sites. While this continues, in mid-February, the Town began a two-step selection process to hire a Construction Manager who will work with the Town and Carollo to deliver the project. We are going to be using a Construction Manager at Risk method for the construction of the sites. The first step is for statements of qualifications to be submitted and reviewed by a selection committee made up of industry professionals. This was completed in early March. Upon review, we moved to the second step where the selection team will interview the highest ranking firms in mid-April.
The Construction Manager at Risk (CMAR) process is a collaborative project delivery method where the Owner (Marana Water) contracts a designer and a construction manager separately and they then work as a team to complete the project. Both the engineering designer and the contractor need to be engaged with a contract. We retained Carollo Engineering in January of 2019, and are in the middle of the process to secure a contractor. Typically, the Owner will select a Construction Manager when the engineering design is at approximately 30% completion to perform pre-construction services. These services include working directly with the Owner and the designer to perform constructability reviews, cost modeling, and value engineering during the design process.
There are many advantages to using a CMAR process for complex projects like this one. First, during the pre-construction phase, the Construction Manager, along with the Owner and the designer, can collectively identify potential opportunities to accelerate the project schedule. Some examples of this are identifying items that have a long lead time, or putting portions of the projects out to bid that are earliy in the project timeline. Secondly, the Construction manager will also be performing careful cost modelling of the project by obtaining bids and cost estimates for the project. The Construction Manager is required to deliver the project with a Guaranteed Maximum Price (GMP). Typically, when the project is at the 90% design completion phase, the Construction Manager will provide this GMP, which includes predetermined Owner allowances and contingencies. This is where the “at-risk” comes into play. Each bid packages has a GMP based on the efforts and due diligence of the Construction Manager during pre-construction. The Construction Manager is financially liable, or “at-risk,” should there be any necessary costs to complete construction above and beyond the GMP. This is another advantage, by providing cost security to the Owner.
On February 14, the EPA released their much anticipated “PFAS Action Plan.” According to the EPA, the PFAS Action Plan:
Demonstrates the agency’s critical national leadership by providing both short-term solutions and long-term strategies to address this important issue
Provides a multi-media, multi-program, national research, and risk communication plan to address this emerging environmental challenge
Responds to the extensive public input the agency has received over the past year during the PFAS National Leadership Summit, multiple communication engagements, and through the public docket.
To read a summary of the EPA’s Action Plan for PFAS, click here.
On January 22nd, the Water Infrastructure Finance Authority (AZWIFA) approved a loan to the Town of Marana for $15 million for the design and construction of two advanced water treatment facilities. Upon closure of the loan documents, the Marana Council approved the design engineering services contract for Carollo Engineering. Carollo will be working with the Town throughout the duration of the project, which includes final design, construction oversight, treatment plant start up, and post-construction activities. A design kick-off meeting took place the week of January 22nd with Marana Water staff. Carollo is a national engineering firm that specializes in water and wastewater infrastructure projects. The team working with the Town is from the local Tucson office.
AZWIFA is a governmental organization dedicated to protecting public health and promoting environmental quality through financial assistance for water and wastewater infrastructure. AZWIFA offers funding for drinkign water, wastewater, and stormwater projects designed to ensure safe, reliable drinking water and proper wastewater treatment. Over the last 25 years, AZWIFA as invested over $2 billion in Arizona communities. For more information, visit the AZWIFA website here.
On December 12th, the Water Infrastructure Finance Authority of Arizona (AZWIFA) approved the offer of a $15 million loan to the Town of Marana to address the issue of unregulated compounds. The final loan agreement documents with AZWIFA will be brought to the Marana Town council most likely in January 2019 for final acceptance.
Marana Water has selected and is currently negotiating a contract with a design engineering firm to begin the process of design for the two advanced water treatment plants. Each water system (Picture Rocks and Airline/Lambert) will have a treatment plant designed and constructed to significantly reduce or remove the discovered unregulated compounds (PFAs and 1,4-Dioxane).
Town of Marana has joined City of Tucson in a lawsuit filed Nov 8 in Pima County Superior Court as part of their ongoing effort to protect the public from any potential adverse health effects that could be caused by per- and polyfluoroalkyl substances (PFAs) that are present in portions of the groundwater supply.
Marana Town Manager Jamsheed Mehta wrote a letter to Town Council responding to questions about interim water consumption as the Town prepares to build two operational treatment plants for the Airline/Lambert and Picture Rocks water systems.
Additionally, Arizona Department of Environmental Quality wrote a letter supporting Town of Marana’s efforts to address unregulated compounds in drinking water.
Town Council approved Resolution No. 2018-091 on Tuesday, September 25 authorizing the creation of the Picture Rocks water treatment campus capital project and the Airline/Lambert water treatment campus capital projects. The resolution also authorizes the transfer of up to two million dollars in budgeted expenditure authority, and authorizes the application for a clean water state revolving fund loan from the Water Infrastructure Finance Authority of Arizona (WIFA) to fund the construction.
The Town of Marana Council made a unanimous decision on Tuesday, August 14, 2018 to pursue design and construction of a water treatment facility for each of the two impacted systems in Marana Water found to contain unregulated compounds. Additional information can be found at the links below.