Updated February 1, 2020

The Federal Aviation Administration mandated that airports lacking long runways install sections made of a material* that stops planes when necessary. The project at SFO began in 2014. The return to the full use of the affected runways was slowly implemented until the end of 2015. Perhaps the change in fences,  jet blast barriers (type and position) and "powerup" locations caused the noise issue?

North Caroline, January 2010
Iran, January 2020
*Engineered Material Arresting System - In SFO's case, possibly 4-foot square blocks of crushable concrete aggregate filled with foam
Planes used to start their powerups close to here.
Above image - date unknown
Since SFO repeatedly rejected my requests to talk with someone who was knowledgeable about the airport's runway changes, the following is conjecture.
Guess #1:  Planes on the runways that face Oakland now start their "power up" (with the brakes on) 400 feet farther away from the freeway before they start their "takeoff roll". Perhaps the barriers that diverted the "back blast" noise up until the end of 2015/beginning of 2016 were replaced with a different back blast  barrier that's no longer diverting the noise? Perhaps NO back blast barriers were re-instated since the jets are now 400 feet away from the Bayshore?
Guess #2:

side blast

Construction paralleling 
the runways facing Oakland seen below. (Date unknown.) Is it possible
the sideblast deflects off the building?

The security barrier running along Bayshore Highway now

Plane taking off to the right
Departure noise
Jets "side blast" on takeoff
Departure noise
Guess #3: Is it possible that the side blast from the jets taking off on runways 28 no longer have an effective sound barrier between us and them?
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© 2018 by Sally Meakin.