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AMENDMENT NO. TWO TO CONTRACT K-1516-85: BY AND BETWEEN THE NORMAN UTILITIES AUTHORITY AND ALAN PLUMMER ASSOCIATES, INC., INCREASING THE CONTRACT AMOUNT BY $50,000 FOR A REVISED CONTRACT AMOUNT OF $305,000 TO PROVIDE WATER MODELING ASSISTANCE ON AN ON-CALL BASIS IN ASSOCIATION WITH THE FYE15 WATER WELLS AND SUPPLY LINES PROJECT.
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BACKGROUND: In March 2012, the Norman Utilities Authority (NUA) approved Contract K-1112-124 with Carollo Engineers, Inc. for preparation of the 2060 Strategic Water Supply Plan (the 2060 SWSP). The plan update was needed because the NUA was unable to supply sufficient potable water to meet peak demands during summer months and was concerned about probable regulatory changes affecting both our surface water and groundwater supplies.
The goal of the 2060 SWSP is to strengthen our knowledge of potential short and long-term water supply source(s) for our community and begin implementation of a robust, water supply solution acceptable to the customers of the Norman Water Utility. The 2060 SWSP Ad-Hoc Committee was appointed to ensure open and two-way dialogue with the community, to ensure the suggestions of the public are addressed, and to be able to communicate the objectives and conclusions of the 2060 SWSP to the public.
Eight meetings were held with the 2060 SWSP Ad-hoc Committee and six public meetings were held for public participation and input. Fourteen different portfolios were developed, investigated and evaluated at these meetings. Each portfolio was developed to provide an annual average supply of 29 million gallons per day (MGD) in 2060 and a peak daily supply of 55.4 MGD in 2060. Ultimately, Resolution R-1314-146 was approved by the NUA on June 24, 2014 recommending Portfolio 14 for implementation; this portfolio included the following recommendations:
1. Continued use of Lake Thunderbird as a raw water supply source with treatment at an improved water treatment facility at the existing site (but with the current allocation reduced from 8.4 to 6.1 MGD based on a pending Bureau of Reclamation yield study);
2. Expanded water conservation practices ultimately resulting in additional water supply of 1 MGD in 2060 through reduced water consumption;
3. Additional non-potable reuse ultimately resulting in additional potable water supply of 0.8 MGD in 2060 (and reduced peak summertime demand of about 4.6 MGD by 2060);
4. Continued use of our current groundwater supply system of 36 wells and expanding our groundwater supply system by 2 MGD in the short term for a total of 8 MGD;
5. The addition of treatment for arsenic and chromium 6 at a centralized facility increasing the groundwater capacity to 10.1 MGD by bringing 12 inactive wells back on-line; and
6. Implementation of indirect potable reuse (IPR) over time by adding additional treatment at the Water Reclamation Facility (WRF) and discharging the highly treated effluent into Lake Thunderbird; raw water conveyance and water treatment expansions would be required.
The Fiscal Year Ending 2016 (FYE16) budget included capital improvement project WA0212 known as the FYE15 Water Wells and Supply Lines. As noted in Item 4 above, this project was recommended as a part of the NUA approved 2060 SWSP and was approved by Norman voters in 2015 as an interim means to increase the City of Norman water supply. Staff distributed Request for Proposal (RFP) 1516-6 in August 2015 and proposals were received on September 14, 2015. The scope of RFP 1516-6 was generally to:
1. Study geologic conditions within the Garber Wellington aquifer, evaluate and propose the most cost effective well field development plan for Norman,
2. Recommend, permit and acquire sites and water rights for test wells and production wells,
3. Recommend test well drilling and testing procedures to maximize water quantity and enhance water quality,
4. Consider the implications of pending (and potentially new) EPA rules concerning drinking water quality and evaluate and recommend the optimum location of a future ground water treatment facility or facilities, including blending;
5. Provide design documents and construction assistance for the installation of test wells, production wells, well houses and transmission system improvements to convey potable water to customers.
In October 2015, the following consultants were selected to perform the tasks identified below:
1. Carollo Engineers, Inc. of Oklahoma City, Oklahoma: Study geologic conditions within the Garber Wellington aquifer; recommend a well field development plan considering the likely location of a future groundwater treatment facility while optimizing future water transmission and distribution lines; water right acquisition; test well and production well design with associated construction administration.
2. Cowan Group of Oklahoma City, Oklahoma: Water rights permitting through the OWRB.
3. Alan Plummer Associates, Inc. (APAI) of Oklahoma City, Oklahoma: update our city wide water distribution system model originally prepared in 2003 to include all waterlines; model calibration and recommendations for future improvements to enhance performance.
4. APAI, Garver and Cardinal were tentatively selected to perform work associated with water transmission improvements once water well locations have been finalized.
On February 9, 2016, the NUA approved Contract K-1516-85 for $222,000 authorizing APAI to perform services to update the existing water distribution model. Generally, APAI will update our existing Infoworks water distribution system model to reflect current loadings projected by the Norman 2025 Land Use and Transportation Plan (as amended); incorporate recently constructed water distribution improvements, calibrate the model based on peak summer-time water demand, and recommend future water supply and water distribution improvements to correct deficiencies in the existing water distribution system.
On February 28, 2017, the NUA approved Amendment No. 1 to the APAI Contract authorizing further work toward development and calibration of the hydraulic water model at a cost of $33,000 for a revised contract total of $255,000. The work effort associated with the original modeling scope tasks increased and the duration and work was extended when multiple data issues and anomalies were identified and remedied by APAI. The water distribution model update was complete in March 2018.
Discussion: Proposed Amendment No. 2 to the Contract K-1516-85 will encumber an additional $50,000 to APAI for a revised contract total of $305,000 and authorize additional water and wastewater modeling services on an on-call basis. Under this amendment, NUA staff could request additional modeling work and APAI could quickly respond with a detailed work scope and estimated cost. NUA staff could authorize the work if the cost was less than $25,000; work scopes greater than $25,000 would be forwarded to the NUA for approval.
At this time, the NUA has requested APAI assistance in determining the appropriate size (diameter) for the transmission lines from the new water wells. Additionally, APAI will evaluate other scenarios where water wells may need to be grouped together for chlorination or other treatment in the event State or Federal water quality regulations require such treatment.
The FYE20 budget includes $54,444 in FYE15 Water Wells and Supply Lines, Design (account 31993345-46201; project WA0212) which is adequate to fund the amendment.
RECOMMENDATION: Staff recommends approval of Amendment No. 2 to Contract K-1516-85 with Alan Plummer Associates, Inc., of Oklahoma City, Oklahoma, in the amount of $50,000.