the impact of that massive dewatering is very large outside in terms of a footprint it can impact the water outside, we have seen in the data from the t.j.p.a. own consultant, they dropped it outside t.j.p.a.'s own excavation by something like 20 feet which is very significant. that's one element. the second one, also the salesforce tower project, which is a very large footprint project that went on for a number of years and had dewatering associated with that project as well. so between the t.j.p.a. project and the salesforce project with really on long duration and dewatering and pretty massive amount of footprint to dewater, those two have had, in my opinion, quite a bit of impact in terms of sediment in the tower. >> but absent that, the millennium sunk twice as much as predicted, neither one of the other projects just referenced had even turned their first shovel-full of dirt. >> true. see the thing is, when you dewater something, the water will take time to come back to its natural level. millennium tower desettling stopped sometime in 2008, it impacted the tower. so by the time

so they are separate from each other, but the dewatering for the midrise was much more extensive and much longer than was anticipated, and that, in my opinion, was the ramain rean why the settlements were exceeded -- at least estimates were exceeded. >> supervisor peskin: okay. and you actually in the report even speak to the potential need for groundwater recharging. do you know if any of that happened? >> no, there was no recharge. >> supervisor peskin: there was no recharging. and on page 15 of the report, speaking to the midrise structure, the podium structure, where the estimate in 2005 was settlement ranging from about one to 3 inches, it says that these settlements were calculated using foundation pressures provided by disimone dated 17 june 2004. do you believe today that those foundation pressures provided by disimone were correct? >> i have no way of -- of questioning a structural engineer's estimate of pressures which comes from the weight of the structure. that is their design, and they know how heavy the structure is, and they know their structural elements. so you know,

see the thing is, when you dewater something, the water will take time to come back to its natural level. millennium tower desettling stopped sometime in 2008, it impacted the tower. so by the time they turned off the dewatering and let the water kind of come up, as you can imagine, water, when it comes up, it lightens the load so that's the beneficial effect of water getting back to static level. another 2-4 inches was remaining and based on the data, i'm convinced we were reaching the lower bound of that additional settlement before activities with t.j.p.a. started that kind of started the acceleration, the second acceleration of the settlement. >> is it true where ground water levels are at lower elevations on one side of the building than the other, the side with the lowest ground water level would be where differential settlement would be the greatest? >> you mean, i'm not following you. >> supervisor peskin: are ground water levels uniform or can they be higher or lower? >> if you let it come up, it will come to its natural level everywhere. if you have deexcavation, you have a hyd