Remember how we've been monitoring for both dust and silica since the project started, and posting the reports every week here for you? Well, at this point in the project, all of our demolition activities are completed. This was the work that could have potentially produced silica. Great news, for sure. (Note: if you haven't had time to go through all of our reports, the summary is that there have been no exceedances of the public health standards at any point in the project.)We're going to keep monitoring and testing for any dust, using the fixed monitors throughout the job site, and reporting the data online weekly. This also means that we'll still get automatic alerts if the levels reach a certain point so we can take real-time action. Going forward, we're going to pause our silica monitoring.Making this change also aligns with our construction policies under COVID-19. The silica testing requires staff to go on-site several times during construction shifts, and as we mentioned last week, we're limiting staff on the job site to only essential personnel.If anything changes about our work and we have to do some kind of demolition activity, we can and will reinstate the silica testing. In the meantime, you can continue to get those weekly environmental monitoring reports from us. Click the button below.
Want to impress dad on your next video chat? Need fresh material for your transit trivia Houseparty? For those of you who’ve been reading this newsletter from the beginning, you know we've covered a lot of wonky ground already. So we turned to the people who love the technical details more than anyone we know—our engineers and designers. Here are three fresh facts about the structural fiber-reinforced polymer (FRP) we're using in the tunnel to create the new walls between the tube and the tracks:
We got a lot of positive feedback on last week's FRP fresh facts. Keeping with the resiliency theme and doing a deeper dive into some elements as we approach the tunnel completion, here are three new tidbits about our cable racking system:
Yes, you read that right. The fourth rail. We now have one in the L tunnel. Let's back up and review how we got here:Subways run on two rails. The energized third rail supplies power to the train. When Superstorm Sandy happened and we made our plan for repairs, we originally were going to completely replace the existing third rail with a new low resistance composite rail, AND replace the negative return cables. Expensive? Time-consuming? Yes and yes. So we reevaluated our plan, and found a solution that had never been tried before. Reuse the existing third rail to supplement the negative return power system. Or in other words, create a fourth rail.Here are some additional facts about this fourth rail innovation and how it works:
As you know, having a truly resilient L tunnel means both installing new infrastructure AND ways to proactively monitor it.We've talked about how this monitoring system—specifically, "fiber optic monitoring system"—works. Here are more facts about what goes into it (yes, including rodent prevention):
September 12, 2020MTA Installs New Escalator for L Customers at Union SquareEscalator Will Enable Faster and Easier Transfers and StationDepartures From Station For Thousands Of Customers Leaving the LPlatformWork Was Associated With Broader L Train Project That RehabilitatedTunnel Damaged During SandySee Photos and Video of the EscalatorMTA officials today announced the completion of work to install aplatform-to-mezzanine escalator on the L platform at Union Square.Part of the broader L Project, the the addition of the new escalatoris expected to reduce crowding and improve circulation at the UnionSquare Station once ridership levels return to pre-COVID levels.“This new escalator is another achievement for the larger L projectteam that, delivered that huge project early and below budget," saidMTA Chief Development Officer Janno Lieber. "Even in the midst of theCOVID-19 pandemic we're using innovative strategies to delivercustomer improvements faster and at lower cost than ever before."When ridership is at normal, pre-pandemic levels, the L platform atUnion Square is among the most congested in the system. Nearly 20,000customers use the platform hourly during the morning peak hour. Aplatform-to-mezzanine escalator helps expedite egress times, clearingthe platform of customers more quickly so that the next train canenter the station safely and more quickly as well. Those upgrades,along with improvements that were made to the transfer stairs betweenthe L platform and the N, Q and R lines, will ensure customers canseamlessly transfer or exit from the station. Previous station designsincluded the space and structural elements for the escalator, but ittook the L Project to actually get it built.There are now 231 escalators in the subway system.
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