Glad to see this extend a classic quest (in the same vein as Mirra's Sleepless Nights to The Enemy Within, or Protect Baudry's Interests to Hiding in Plain Sight). The bridge platform area is interesting, but seems a bit overdone in the sense of "who would build ramps this convoluted to a lever in a sewer system". Not saying it has to be entirely logical given we have them in places like Waterworks or The Pit, but those either felt more organic, or had enough variance to be more appealing and interesting. Maybe this is on my mind because there are redundant and symmetrical pieces to that area in The Covered Culvert?
As a Minimum Level 4 quest, the EXP for time has the potential to be insane (better than The Stones Run Red, which is pretty much the top-dog EXP for time quest in the level 1-6 range). Coupled with Heroic solar/lunar augments and a set of Acid gloves that are solid, I can see this being a quest to run every life (for Heroic/Racial stuff).
As a Minimum Level 35 quest, I did this as an overpowered character and breezed through, so I may have to try this as a lesser powered character to form a better opinion. Still one of the shortest quests for Legendary solar/lunar augments.