CITY COUNCIL MEETING AGENDA PACKET

City of Pleasanton, CA (0012108.00) 2-3 Woodard & Curran, Inc. Pleasanton Long-Term Sewer CIP October 6, 2025 Due to the limited CCTV data available (~30% of the system), assumptions were made for the long -term CIP about the total number of pipes that would require near-term R&R while the City completes its CCTV inspections. It was assumed that the same proportion of pipes identified for R&R in the 2025 condition assessment would apply to the rest of the system (e.g. if 10 pipes were identified in 2025 with an R&R decision because of defects present in the pipes, about 23 pipes would require an R&R decision in the portion of the system without CCTV data). This assumption will be revisited once the CCTV inspection of the system is completed, and the gravity condition assessment is updated based on the additional inspections. 2.2 Lift Station Condition Assessment Lift stations are regularly inspected by operators and the findings recorded on the City’s lift station inspection forms. The lift stations also underwent an engineering assessment as part of the long-term CIP process. The engineering assessment was completed in January 2025 by Woodard & Curran. The evaluation process included an initial review of record drawings and miscellaneous documents followed by onsite inspections and assessments of each station’s configuration, process condition, mechanical conditio n, observed structural condition, safety, operations and maintenance issues, electrical facilities, and overall long-term reliability. In addition, Woodard & Curran coordinated with City staff for input on which lift stations present the highest risk in terms of day-to-day operations. The assessment also incorporated the findings and recommendations of a separate generator study completed by TJC and Associates. During the inspection of each lift station, issues were highlighted that may warrant additional attention or future improvements. For each facility, these identified issues were given numerical criticality (1 = Fair/Good, 2 = Poor, 3 = Crucial) and categorized into six (6) groups: Process, Mechanical, Electrical, Structural, Site, and Health & Safety. Recommended lift station improvements based on the results of the lift station condition assessments were prioritized and have been scheduled in the City’s long-term CIP. Additional assumptions about future lift station rehabilitation were also included in the long -term CIP based on the ages and criticality of each lift station. These rehabilitation assumptions represent high level electrical, mechanical, process, health and safety, and minor site upgrades that are needed based on the age of the lift station. 2.3 Sewer Capacity Evaluation A sewer system capacity evaluation was conducted by Woodard & Curran in 2024; the analysis used a calibrated all-pipes model of the City’s sewer network to determine if any pipelines did not meet the City’s capacity criteria. The model was developed in Infoworks ICMTM and used water billing data from 2017 through 2021 (with 2020 being omitted due to its assumed irregular water usage due to COVID19 stay -at- home orders) as the basis for existing base wastewater flows. The model was calibrated to flow meters installed at several different locations across the sewer network. This calibrated data was the basis for the dry weather flow scenarios that would be used in the capacity evaluation. For wet weather, a 25 -year design storm was chosen based on City input that closely matched a large storm event that occurred during the flow monitoring period. This design storm served as the basis for the wet weather flow scenarios that would be used in the capacity evaluation. The capacity criteria used for the evaluation specified that sewers should flow no more than ¾ full under peak dry weather conditions and water level in manholes should rise no higher than to 3 feet below ground (freeboard) under a design peak wet weather flow condition. Under existing sewer flows, no sewers in the Page 222 of 323