December 2020 status reports for Purple Line. Section 1: 66.9% (+0.7%), contractor forecasts they will be 230 days late ?(about 7.5 months) in completing the project. Section 2: 40.8% (+0.65%). Contractor forecasts finishing 41 days early. Section 3: 17.6% (+0.7%)
It was ahead of schedule of the schedule provided in the January 2021 status report, but the other TBM seems to still require anomaly mitigation before it can start up again (based on the January status report not putting it on the schedule for the next 6 months):
January 2021 status reports for Purple Line. Section 1: 67.8% (+0.9%), Contractor now forecasts they will be 257 days late in completing the project (26 days additional delay from December forecast). Section 2: 41.7% (+0.9%). Contractor continues to forecast finishing 41 days early. Section 3: 18.15% (+0.55%). One tunneling machine has started tunneling. Second tunneling machine expected to launch in April (previously expected to launch in March).
March 2021 Construction Committee updates on the Purple Line.
Purple Line 1: Second tunnel machine expected to reach La Cienega and complete tunneling next week. Purple Line 2: Both tunnel machines are stopped under Beverly Hills High. One is undergoing scheduled maintenance, but the other has unplanned repairs/maintenance required. Purple Line 3: Not much to report. Tunneling has started.
An independent monitoring/oversight report says the San Vicente anomalies will likely delay start of service on Purple Line Section 1 to late 2024, and isn’t optimistic that they can find ways to recover the lost time.
Purple Line 1 budget needs to be increased again by $150 million due to the San Vicente anomaly that ate up almost a year of time. And they say the contractor has additional change order claims that Metro is currently disputing so it is currently not part of the budget increase ask.
Purple Line 1 - based on reports, it should be done with tail track mining, so the TBMs should be done. Purple Line 2 - they report that the damaged cutterhead was repaired on May 1, so it looks like that was a 1-2 month delay. Purple Line 3 - they report that both TBMs have launched. Since tunneling on Purple Line 2 was delayed so much, there really could be a situation where tunneling for both 2 and 3 end around the same time. Then again, who knows if they encounter even more anomalies...
The Phase 1 anomaly caused tunnelling delay by 3 months if I recall. Why is opening now a full year behind schedule?
And looks like Phase 2 tunneling anomaly didn't cause any delays.
The Phase 1 anomaly was discovered sometime in Spring/Summer of last year, and they didn't get it mitigated until around February or March of this year.
Yeah, the Phase 2 anomalies took nearly as long, but it didn't cause a delay in schedule or a large budget increase. They never explained why that was. Maybe because the Beverly Hills school district was responsible for mitigating the anomaly on their school grounds instead of the contractor, they accelerated the Rodeo station excavation by a couple of months, they waited until the anomalies were mitigated before they started tunneling (so fewer tunneling crews sitting around doing nothing), and maybe Tutor Perini is being strategic about this project, as it is their first project since an informal two-decade ban by Metro--they don't want to hurt their chances on winning the next $10 billion in projects (ESFV and WSAB) by having a delay or budget overrun on this $1.4 billion job.
Post by culvercitylocke on May 17, 2021 11:34:25 GMT -8
phase 1 they mention the anomaly and also the Crescent Heights gas and methane issues and I think unknown abandoned wells too there... I think the combination of the anomaly and the intense gas/well issues west of Fairfax delayed teh entire reach three tunneling.
for Phase 2, they were insanely behind building just the TBM pit, it took them like a year to excavate, then a year delay in the tunneling. so that is especially strange.
however, they did gain a year of time with the Rodeo-Covid acceleration last spring, so maybe it balances out?
Additionally, if excavation of Century City station is already 17% complete, then it should be completely excavated with HDPE and invert slab by the time the phase 3 TBMs garrive, so they may not have to do the expensive and extremely long, in-tunnel TBM disassembly they had planned to do.
Section 1: 70.3%. chedule/progress forecast has been updated to account for a 1 year delay. Section 2: 43.7%. Both tunnels are now moving and made about 3-5% progress in the month. Section 3: 23.3%. Tunnel machines still in startup phase. UCLA station piling was expected to start next week.
Purple Line Section 2 has slower than expected progress—they apparently have issues with the conveyor belt systems for tunneling and have decided to replace it with system with another type of system, a crane and muck box system, which requires pausing tunneling.
July 2021 status reports for Purple Line: Section 1: 71% done, +0.4% since June. Contractor added another month to the estimated completion date (now July 23, 2024). Section 2: 44.9% done, +0.6% since June. Contractor added 11 days to forecast completion, expects to be 71 days late. They paused to replace their conveyor belt mucking system recently with a different system (the system that removes excavated dirt from the tunnels) and say things will move faster now. Section 3: 26.9% done, +1.2% since June, but 5.9% behind planned progress.