FW North Lake samplesI received this from Ken. I replied that we would let him know what
adjustments are made. From looking at the data, it’s clear that the
North Lake water is having an impact. I think we’ve been OK the last
couple days because of the high runoff, but flows are back down to
normal and the pumping is roughly half the flow, I would recommend that
discharges be reduced 50% to accommodate and we then discuss the
following options:
1. Ride out at half the pumping, which would take about 4 weeks to
get to 478 instead of the 2. Don’t know the impact to each party.
2. Continue at half rate until a “cost neutral” point. 2 weeks
would probably be 483. 3 weeks 481. Have to discuss where a cost neutral
point is since lease goes up and fuel goes down. This should also take
into account whether it required a second mobilization or not.
3. Just pump to about 485 or less, similar to original plan and
release the water (with proper warnings) through the structure. Not
likely to be acceptable to the Billingsleys, but a realistic negotiating
point.
For both the first two, we would want to take advantage of any higher
flows with additional rain to ramp up the pumping. We could develop an
estimate of equivalent mixing rates.
If it helps, I’ve included links to a couple of a couple USGS plots.
The Carrollton one is upstream from the release and the Spur 348 is
downstream. We can track these in real time.
http://waterdata.usgs.gov/nwisweb/graph?agency_cd=USGS&site_no=08055560
&parm_cd=00060&period=7#.U3TFG5BLdSE.email
http://waterdata.usgs.gov/nwisweb/graph?agency_cd=USGS&site_no=08055500
&parm_cd=00060&period=7#.U3TFXpknLi0.email
Link to gauges. Two above are listed in the section for the Trinity.
http://waterdata.usgs.gov/tx/nwis/current/?type=flow.
I will be out of town most of today and all of tomorrow for my son’s
graduation, but will be available sporadically on my cell and by email.
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>
From: Delregno, Kenneth [mailto:kenneth.delregno@dallascityhall.com]
Sent: Thursday, May 15, 2014 8:15 AM
To: John Rutledge
Subject: North Lake samples
Attached are recent sample results from our WQ section. The aluminum
concentration exceeds the acute criteria for the Elm Fork basin (0.991
ppm). As noted before, the chlorides exceed the stream standards. I
would suggest that the release be reduced to alleviate the downstream
impacts.
Thanks.
Ken DelRegno
Assistant Director
Water Production
Dallas Water Utilities
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