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Home My WebLink About04.b. Update on District's Response to Wet Weather Events from December 2022 to January 2023Page 1 of 13 Item 4.b. F.1_448�411C_S 0 March 13, 2023 TO: ENGINEERING AND OPERATIONS COMMITTEE FROM: PAUL SEITZ, PROVISIONAL DIRECTOR OF OPERATIONS REVIEWED BY: ROGER S. BAILEY, GENERAL MANAGER SUBJECT: RECEIVE UPDATE FOR THE DISTRICT'S RESPONSE TO THE WET - WEATHER EVENTS FROM DECEMBER 2022 TO JANUARY2023 This presentation will provide the Committee with additional information regarding the response activities related to the storm events from late December 2022 to mid -January 2023. Strategic Plan re -In GOAL ONE: Customer and Community Strategy 1— Deliver high -quality customer service GOAL TWO: Environmental Stewardship Strategy 1 - Achieve compliance in all regulations GOAL SIX: Infrastructure Reliability Strategy 1 - Manage assets optimally ATTACHMENTS: 1. Presentation March 13, 2023 EOPS Regular Committee Meeting Agenda Packet - Page 29 of 43 Page 2 of 13 Introductionft 'ii: f;r Six storms brought hazardous conditions I r to the Bay Area from December 26, i271;� f 2022, to January 17, 2023 y 5ona.ma �• � a � f,=r fir• eonrr G sr ,� -;y=• ' _ Total Precipitation &"r""" r �� Al r 5ph.m River $w- +• Afarneda - Aw ftrj--y,?Y0 2j �nrrrsr�.�,.yr�� waw ce�cu.nv ror.T.wrxwra wr.•-. �~..� — 5a Mateo an C a March 13, 2023 EOPS Regular Committee Meeting Agenda Packet - Page 30 of 43 1 Page 3 of 13 Introduction (continued) Central San's service area experienced 10-20 inches of rain during the late December to early January storm events Storm events were referred to as "Bomb Cyclones" and "Atmospheric Rivers" Three weeks were the wettest in the Bay Area since 1862, 161 years In California, these events caused 700 landslides, approximately 30 billion dollars in damages, and 20 deaths In general: There were no Sanitary Sewer Overflows (SSOs) in the collection system or at the pumping stations Central San's treatment plant experienced high flows and bypassed the basins while not violating any permit conditions This presentation will provide the committee with additional details concerning Central San's response to the storm events Collection System Ward 1— Pleasant Hill and Martinez No SSO in Ward 1 Active site list: F Street, Martinez —to Engineering (ENG) Foot bridge and storm drain failure Hawthorne Road, Pleasant Hill Pipe exposed in creek channel Assisted at Subdivision 6, Stonehurst Waste Treatment Plant, Martinez High flows from storm water .. j . t p 4 i. git ,"",tW r.� March 13, 2023 EOPS Regular Committee Meeting Agenda Packet - Page 31 of 43 2 Page 4 of 13 Collection System Ward 2 — Lafayette, Moraga, and Orinda No SSO in Ward 2 Active site list: Poppy Lane, Orinda —to ENG Creekbank failure Hall Drive, Orinda — to ENG Storm drain failure St. Mary's Culvert, Moraga Continued maintenance for storm events Tappan Terrace, Orinda — to ENG Continued monitoring of existing slide Cricket Hill, Orinda Pipe exposed in creek channel Green Hills Road, Lafayette Storm drain failure Cedar Lane, Orinda —to ENG Slide that caused structure damage March 13, 2023 EOPS Regular Committee Meeting Agenda Packet - Page 32 of 43 3 Page 5 of 13 Collection System Ward 3 — Walnut Creek No SSO in Ward 3 Active site list: Citrus Creek Crossing, Walnut Creek Erosion at creek crossing Quandt Drive, Walnut Creek Slide covering manhole Holly Hill, Walnut Creek Slide near rodding inlet Blade Court, Walnut Creek Slide near sewer main Tice Creek Culvert, Walnut Creek Sewer through culvert om 7— March 13, 2023 EOPS Regular Committee Meeting Agenda Packet - Page 33 of 43 4 Page 6 of 13 Collection System Ward 5 - San Ramon No SSO in Ward 5 _ There are no active sites in San Ramon that p are being monitored by Collection System Operations (CSO) Plant Operations Rain and Elevated Flows December 26 -January 17 Ground saturated Large single day totals Multi -day events Each storm/event building on top of the prior rain Danville Library Cirinda FS 43 Ygnacio Valley FS DATE PPT INCHES PPT INCHES PPT INCHES 12/26/22 0.19 0 0.20 12/27/22 2.15 2.02 1.27 12/28/22 0 0.01 0 12/29/22 0A7 0.32 0.32 12/30/22 1.59 1.75 0.56 12/131/22 5.14 4.49 3.23 1/1/23 0 0.01 0 1 /2/23 0.48 0.48 0.34 1/3/23 0.05 0.05 0 1 /4/23 0.95 0 1.20 1/5/23 1.00 0 0.56 1 /6/23 0.01 0 0.01 1 /7/23 0.09 0.20 0.11 1/8/23 0.74 0.29 0.56 1/9/23 1.66 2.22 1.13 1/10123 1.15 1.07 0.67 1/11123 0A7 0.39 0.22 1/12/23 0 0 0 1/13/23 0 0 0 1/14/23 1.77 2.08 1.39 1/15/23 0.97 1.25 0.68 1/16/23 0.86 0.83 0.59 1/17/23 0 0 0 Flow Scatlon (FS) P-.p.1-- (PPT) March 13, 2023 EOPS Regular Committee Meeting Agenda Packet - Page 34 of 43 5 Page 7 of 13 Plant Operations On December 31: Very high influent flows Already received 4-5" of rain since December 26 Received additional 3.5-6" on December 31 across the service area Influent Pump #4 (75 million gallons per day (MGD)) was out of service/offsite Influent flow peaked at 239 MGD at 3pm Plant Operations Wet Weather Basins Very near basin capacity Basin A North — 18.6 million gallons (MG) Basin A South — 18.1 MG Basin B — 93.5 MG Basin C-33.9 MG Basin D — 7.8 MG 172 MG total capacity with 6" freeboard �s 1000 i 0.0 ■ o.o . March 13, 2023 EOPS Regular Committee Meeting Agenda Packet - Page 35 of 43 6 Page 8 of 13 Plant Operations , January 15 into January 16: Near or at capacity in Basin B, Basin C, and Basin A North Pumping from Basin C into Basin D CSO staff cut trench across gravel road to allow water to gravity from Basin C into Basin D Filling Basin A South from 5pm to 11:30pm on January 16 Plant influent flow dropped under 110 MGD at 11:30pm on January 16 Pacheco Creek looking Southeast Plant Operations January 15 at 5pm-6pm 14 March 13, 2023 EOPS Regular Committee Meeting Agenda Packet - Page 36 of 43 Page 9 of 13 Plant Operations January 16 at 4:30pm & 6:00pm Plant Operations January 18 March 13, 2023 EOPS Regular Committee Meeting Agenda Packet - Page 37 of 43 $ Page 10 of 13 Plant Maintenance r Pumping Stations Operations Pumping Stations Normal Flows vs Wet Weather Flows Normal Flow WetWeather Operation Operation 0 Martinez 1.0 6.0 3 WW pumps 2 WW pumps San Ramon 2.5-3.0 10.8 3 WW pumps I WW pump Moraga 1.0 14.4 I WW, I DW 3 DW pumps Crossroads 8.0 14.4 1 WW pump 3 DW pumps Wet Weather (WW) Dry Weather (DW) Plant Maintenance Before Wet Weather y� Preventative Maintenance (PM) Program Wet Weather Preparation Sandbagged electrical substations r "� Cleaned out storm drains, area drains, and gutters �oA Tree trimming throughout plant site by Expert Tree Checked operation of basin sump pumps 4 Standby Coverage `�r Standby Equipment Checked Pumping Stations Equipment Fuel Portable generators, bypass pumping, and fuel trailer March 13, 2023 EOPS Regular Committee Meeting Agenda Packet - Page 38 of 43 9 Page 11 of 13 Plant Maintenance During Wet Weather Expanded Standby Coverage Pumping Stations had all available crew members on standby Doubled the amount of plant maintenance on call staff Call outs — LJJ Hours Total Buildings & Grounds — 6 Call outs Mechanical — 5 Call outs Electric — 3 Call outs Instrument-6 Call outs Treatment Plant and Pumping Stations Status Maintenance monitored influent grit level Pumping Stations monitored flows Acid wash frequency increase Plant Maintenance Between Wet Weather CSO Vacuum Truck - Grit Removal PM/Corrective Work Replaced and rebuilt rake teeth Removed packed grit in washer compactor and sluice troughs March 13, 2023 EOPS Regular Committee Meeting Agenda Packet - Page 39 of 43 10 Page 12 of 13 Engineering — Capital Projects Collection System: Worked with CSO on several sites through the service area. Monitored ongoing construction projects in Walnut Creek and Danville. Pumping Station Phase 1 completed, Orinda Crossroads and Flushkleen performed as designed and still had capacity. However, Moraga Pumping Station was at 100% capacity and handled high flows. Station is being evaluated. Engineering — Capital Projects Treatment Plant: Expedited repair on motor for Pump No. 4 at Headworks. Installed motor on January 4 and in service January S. Improvements on Influent Pump Electrical Project were fully tested and performed as designed! Monitored ongoing construction projects, especially Filter Plant Improvements. Assisted Operations with bar screen failure at Headworks. March 13, 2023 EOPS Regular Committee Meeting Agenda Packet - Page 40 of 43 11 Page 13 of 13 Engineering - Capital Projects LESSONS LEARNED Re-evaluate and develop new strategies with Operations to handle the intensity of the rain events experienced. "= Develop and implement wet weather basin and collection system management system for Operations. •t WHAT'S NEXT: Incorporate information to projects such as the Wet Weather Basin Improvements, Ultraviolet (UV) Disinfection Replacement, Filter Plant & Clearwell Improvements, etc. Include staff's input and potential new scope for projects at Headworks, Supervisory control and data acquisition (SCADA), and other locations at the treatment plant for the ... - next Capital Improvements Budget 2024. March 13, 2023 EOPS Regular Committee Meeting Agenda Packet - Page 41 of 43 12