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HomeMy WebLinkAbout19.a. Committee Minutes-Engineering & Operations 03-30-21 Page 1 of 6 Item 19.a. CENTRALSAN SANITARYjdf A- hom CENTRAL CONTRA COSTA , . April 15, 2021 TO: HONORABLE BOARD OF DIRECTORS FROM: KATIE YOUNG, SECRETARY OF THE DISTRICT SUBJECT: MARCH 30, 2021 - ENGINEERING & OPERATIONS COMMITTEE - CHAIR WILLIAMS AND MEMBER LAURITZEN Attached are minutes of the above Committee meeting. ATTACHMENTS: 1. Minutes of 03-30-21 meeting April 15, 2021 Regular Board Meeting Agenda Packet- Page 160 of 185 Page 2 of 6 CENTRAL SAN CONTRACENTRAL • DISTRICT 5019 • BOARD OF DIRECTORS: SPECIAL MEETING OF THE TAD J.PILECKI President CENTRAL CONTRA COSTA SANITARY DISTRICT DAPIDR. WILLIA President Pro Tem ENGINEERING & OPERATIONS BARBARA D.HOCKETT COMMITTEE MARIAH N.LR.MCG EMCGILLL MICHAEL R. MINUTES PHONE: (925)228-9500 FAX. (925)372-0192 www.central.yan.org Tuesday, March 30, 2021 11:00 a.m. (All attendees participated via videoconference) Committee: Chair David Williams Member Mariah Lauritzen Staff. Roger S. Bailey, General Manager (joined during Item 4.a.) Katie Young, Secretary of the District Jean-Marc Petit, Director of Engineering and Technical Services Melody LaBella, Resource Recovery Program Manager Nitin Goel, Senior Engineer Stephanie Gronlund, Associate Engineer (left after Item 4.a.) Russ Leavitt, Engineering Assistant III (left after Item 4.a.) Amelia Berumen, Senior Administrative Technician 1. Notice This meeting was held in accordance with the Brown Act as in effect under the State Emergency Services Act, the Governor's Emergency Declaration related to COVID-19, and the Governor's Executive Order N-29-20 issued on March 17, 2020 that allowed attendance by Board Members, District staff, and the public to participate and conduct the meeting by teleconference, videoconference, or both. The agenda included instructions for options in which the public could participate in the meeting. April 15, 2021 Regular Board Meeting Agenda Packet- Page 161 of 185 Page 3 of 6 Engineering & Operations Committee Minutes March 30, 2021 Page 2 2. Call Meeting to Order Chair Williams called the meeting to order at 11:00 a.m. 3. Public Comments No public comments. 4. Agenda Items a. Review draft Position Paper to adopt (1) Resolution of Intention No. 2021- to initiate the formation of the Cordell Drive West Contractual Assessment District (CAD) No. 2021-1 for the purpose of installing sewer improvements on Cordell Drive in Danville; and (2) Resolution No. 2021- approving the boundary for the proposed CAD Mr. Leavitt provided an overview of this agenda item stating that this CAD request is an extension of another Cordell Drive CAD that was completed a few years ago. The Board approved a similar west side Danville CAD that failed to launch and had been idle for over a year. Of late, circumstances changed with a motivated, new property owner that has taken a leadership role in this area and organized neighborhood support of the project. In response to an inquiry by Chair Williams, Mr. Leavitt stated that staff time is not lost from the prior CAD formation in the area and that the 18- month time period associated with CADs is meant for the design of the private sewers. Mr. Leavitt continued with an explanation that staff is requesting the Board approve the proposed resolution and boundary map to begin the process (e.g. engineering report, estimates, funding, etc.). He anticipates returning to the Board in June with the engineering report, after which construction could commence in July. Furthermore, Mr. Leavitt anticipates good support in the area, especially with the involvement of the new property owner that would like to move this summer and, therefore, sync this work with their home construction. Chair Williams stated that in having a dynamic private property leader involved, staff should try to move this along, to the extent possible, to accommodate getting the sewer installed and to avoid added cost, if feasible. A lengthy discussion then followed regarding the CAD process, other properties adjacent to the proposed CAD boundary, and the proportionate April 15, 2021 Regular Board Meeting Agenda Packet- Page 162 of 185 Page 4 of 6 Engineering & Operations Committee Minutes March 30, 2021 Page 3 share of costs for those that participate (connect) and those that do not participate. Participants are aware that they are expected to pay upfront costs for those parcels that do not connect and would be later reimbursed when additional participants do connect. Sometimes this creates a stall in the process as some do not want to pay the upfront share for others. Mr. Leavitt stated that some owners are more eager to connect than others and are willing to pay more initially and wait for reimbursement as more connections occur. For instance, the property owner leading the efforts of this CAD is willing to cover the cost of three other properties to ensure the project is fully subscribed. Mr. Bailey added that, in the long run, as parcel owners connect, they will all pay their proportionate share. Mr. Leavitt offered that the funding agreement spells out who pays the minimum and who is paying additional fees, clearly defining fund allocation. Additionally, Mr. Leavitt said that there is a 20-year limit in which the reimbursement is to be paid. There has been a tremendous number of CADs in the past that were fully subscribed and very few participants advantaged from waiting to connect. The rules associated with septic systems was reformed when the location of such systems within 200 feet of a home changed. There is some value to having a ready sewer available so that a property owner can do what is needed with their system when they want- or able-to connect. Mr. Bailey added that there is some liability involved with a septic tank failure, to the extent that the parcel is within minimum distance and needing to connect. Chair Williams opined that a voluntary aspect of connecting goes away upon septic failure and is something that should be addressed. Mr. Bailey said that time value of money is critical and that important points were raised today. He stated that further internal discussion is warranted to review the current process and participant reimbursements. Chair Williams stated that if a revision is needed, it should be brought before the Administration Committee. COMMITTEE ACTION: Recommended Board approval. b. Review draft Position Paper to authorize the General Manager to execute a professional engineering services agreement with Carollo Engineers, Inc. in an amount not to exceed $900,000 for planning and pre-design services for the Ultraviolet (UV) Disinfection Replacement, District Project (DP) 100012 and UV Hydraulic Improvements, DP 100013 April 15, 2021 Regular Board Meeting Agenda Packet- Page 163 of 185 Page 5 of 6 Engineering & Operations Committee Minutes March 30, 2021 Page 4 Mr. Petit reviewed the presentation included with the agenda material, beginning with a historical background of the current system. Many electrical components are involved as well as a high maintenance of lamps, which staff must rely on a small supplier in order to keep a critical system moving forward. The current UV system creates limitations since the system is very hydraulic dependent. Thus, the modeling graph on slide 6 shows some hydraulic deficiency. During explanation of the roadmap for the UV projects on slide 9, he highlighted that should the UV alternatives option be decided upon, pre-procurement of the equipment would be necessary. That decision and pre-procurement approval would be brought before the Committee ahead of time. Upon discussion of the rigorous consultant selection process for this type of project, Mr. Petit responded to questions raised by Member Lauritzen of whether any of the alternatives were provided in the Request for Proposal (RFP) or if it was strictly for proposal team and cost. He stated that the proposals and interviews were all high quality and very informative, some of which included 3-D modeling. Mr. Petit stated that most consultants focused on UV, while others focused on hypochlorite disinfection for sequencing. He stated that staff is concurrently working on aeration basins improvements under a separate project, of which, one aspect of that project correlates to a UV system within the treatment plant. He stated that more information needs to first be evaluated; however, a lot of ideas were provided during the interview sessions. Overall, the best qualified team was sought to look at improving the existing system and to design the most optimal option, whether it be disinfection by UV, ozone, hypochlorite, or a combination therein. Many evaluations will be conducted for the final design of the improvements, including alternatives. Chair Williams requested clarification on the million gallons per day (MGD) capacity of the current UV system. The draft Position Paper describes 127 MGD and the presentation discussed 123 MGD. Mr. Petit replied that the range is not just about hydraulic capacity, but includes other criteria, stating that the range is between the two figures. The discussion became more technically weighted on various aspects of the project, including UV transmittance (water clarity) and testing, source water, disinfection options, potential trihalomethane (THM) concerns, nutrients, biofouling maintenance, and recycled water interface. April 15, 2021 Regular Board Meeting Agenda Packet- Page 164 of 185 Page 6 of 6 Engineering & Operations Committee Minutes March 30, 2021 Page 5 Mr. Goel responded to a question by Chair Williams of whether there was an issue with source water and if a pilot study was anticipated. He stated that similar questions were posed to the leading firms that understood the current system and its deficiency. It was gleaned from those discussions that a pilot test may not be required, but some water quality testing would be conducted, and that UV dose is another factor to be evaluated. Seasonal testing will occur to determine how much of a dose is required to meet the required level of disinfection. As it pertains to recycled water, Chair Williams asked whether this project had any interconnectedness with the Recycled Water Project regarding residuals. Mr. Petit stated that the Recycled Water Project is downstream from the UV for disinfection. Discussions have occurred with the consultant about optimal connection and the impact of water quality for the tertiary filters. However, this project only pertains to plant effluent disinfection. In conclusion, for the purpose of this agenda item, Chair Williams inquired about the estimated consultant threshold potentially reaching $3.5- $4.0 million as stated in the draft Position Paper, asking whether all consultants were aware of this anticipation upfront, to which Mr. Petit replied yes. The Committee had no further questions and recommended approval. COMMITTEE ACTION: Recommended Board approval. 5. Announcements None. 6. Suggestions for Future Agenda Items None. 7. Future Scheduled Meetings Wednesday, April 7, 2021 at 11:30 a.m. (Special meeting) Tuesday, April 20, 2021 at 11:00 a.m. Tuesday, May 11, 2021 at 11:00 a.m. 8. Adjournment— at 12:04 p.m. April 15, 2021 Regular Board Meeting Agenda Packet- Page 165 of 185