Follow up work on North lakeKeith,
Sorry this took a while to reply, but my thoughts on what will come up
over the Next few years at North Lake:
Dam:
* First inspection less than a year after completion of
construction, about $10k. Would suggest using as a warranty inspection.
Likely need biannual inspections after that though Luminant did annual
due to history of slides. That should not be an issue due to flatter
slopes. This, of course, assumes all things go smoothly and unexpected
issues could change it.
* Instrumentation monitoring. About $5k per year if you do the
measurements. $20k if we do for first year, then reducing as frequency
of reading drops.
* Update the EAP, about $20k. Apparently Luminant received a
letter from TCEQ that which they were to forward to me. I’ll have to
remind them because I have not seen it. Before that, I would have said
within a year or so, but TCEQ may want it sooner.
* Produce or update O&M plan. 5k for update if we can did
Luminant’s. I don’t recall. 10k for new. Without gates, those are
relatively standard and you’ll want one soon after completion of
construction.
* May need to regrade the downstream channel. This depends on
the Billingsleys and I would suggest waiting until we see what their
channel looks like. You have no requirement to do anything since it will
drain OK, but may want to grade to match up with theirs. Only reason to
accelerate is if AW gives you a good price and we see their plans any
time soon.
Water Line:
* Water line is a big unknown that depends on the details of
your agreement and how closely “full” is watched. Would likely need an
assessment and evaluation of alternatives. Hopefully, the lake will just
stay full since it’s stayed above 485 for many years.
* There had been discussion about a drop structure on the
upstream end that the City and the B’s seemed to each think was the
other’s responsibility. I haven’t heard anything on it since, but once
the water is down, that issue will be visible and will need to be
addressed by someone. Won’t threaten the lake or dam, but erosion is
likely and their property and/or the culvert under Belt Line will be at
risk.
That’s all I can think of. The $ values are off the top of my head and
should be conservative, budgetary type numbers. Let me know if this
helps or generates other questions.
Thanks,
John
John Rutledge
Freese and Nichols, Inc.
4055 International plaza, St 200
Fort Worth, TX 76109
(817) 735-7284
jlr@freese.com <mailto:jlr@freese.com>
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