Laserfiche WebLink
Hostetler: Two representatives from Public Works are here. <br />Klusczinski: Would you gentlemen like to make a presentation? <br />Durr: Catherine did an excellent job describing the project, but sure. My name is Jason Durr; <br />I'm the Assistant City Engineer. Rob Nichols, also an engineer for the City is here. I recently <br />received a copy of an updated schedule from our consultants; I'd like to pass that out. Turns out <br />when we met last that the schedule was a little ambitious and now we're looking to be the end of <br />Decemberfor construction to be complete. As Catherine mentioned, this is a new sewer that's <br />going underneath the river, just off the Angela bridge near our current existing river crossing. <br />You guys have probably all passed this intersection and Northshore and Angela and seen this <br />concrete structure at the corner here. The new structure will actually go just to the south of it. <br />The existing structures head works can not be utilized nor the tail works due to the size of it and <br />the structural integrity. If we were to start drilling more holes into it, there'd be some concern <br />with that. We're actually intercepting the flow just south of both of those structures providing the <br />ability to also utilize either one of the runs at any time. So they're both going to have the <br />capacity to take on the entire flow, so we can basically put into service the new line and finally do <br />an inspection of the existing line. Right now, it's the only line that crosses the river at this point, <br />and as Catherine mentioned its got 60-70% of the city'sflow low so if this were to fait we'd be in <br />pretty big trouble. We'd have to bypass pump and all kinds of stuff until we could get this fixed. <br />We are using a newer technology with micro -tunneling. The circles that you see here are only the <br />shafts that are going to be 20 ft diameter and about 40 ft deep. These will not be the manhole <br />sizes that you'll see out there, we won't have 20ft manholes, and it will be a standard manhole lid <br />that you'll see. This one actually will probably kicked out a little further so this one might <br />actually be out in the roadway so that we can get a better angle coming into here. We've been <br />talking about that a little more and how to keep it off the bank. Brent Thompson, the forester, we <br />decided, we put in a $10,000 landscaping allowance to replace anything that we might damage, <br />and he seemed to think that amount would be plenty to restore any trees or grass area that we <br />might disturb. One unique situation and one that we have to be very careful of is that there is an <br />aquifer under the river and it is under pressure. We actually have to dewater that aquifer in <br />order to do our micro -tunneling. If we weren't able to dewater it and relieve the pressure, <br />there's a chance that we could blow the aquifer and allow a larger river of water to come up to <br />the surface, so its kind of unique for this situation. You don't think of another river underneath <br />the river but it's there. <br />Chase: Does it go inline with the river? <br />Durr: Pretty close. It's about the same route. It's an artesian aquifer. <br />Ujdak: What's the size of the pipe that you're putting in? <br />Durr: 48 inch. <br />Ujdak: 48? <br />Durr: Yes, and that will be in a casing. <br />Ujdak: Concrete? <br />Durr: Steel probably. Steel casing with either a plastic HDPE piping or something to that effect <br />that would go inside the casing. <br />Ujdak: And the sewer that comes in that it will be connected to, how big is that? <br />Durr: This ends up being a 96... or a 90 and it ends up being a 96 just a little bit further up the <br />road. <br />Ujdak: And the flow is to your right? <br />Durr: No, itflows this direction. <br />Hostetler: To the sewage plant. <br />Durr: It ends up catching the interceptor and then it runs straight up Riverside Drive to the <br />plant. <br />Ujdak: How much of South Bend goes through there? <br />Durr: Well a good portion. Because 60-70% of the flow so, just at Leeper Park there's a <br />crossing'there and that takes a good section of the city comes across and actually comes to <br />7 <br />