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RE North Lake Dam -- Internal Drainage SystemThanks, Keith. We’ll coordinate with James for site access. On a separate note, can you scan a copy of your markups on the gate details sheet to me? I want to make sure we address all of your comments there, along with any others you may have on other sheets in the plans. Thanks. Patrick Miles, P.E. Water Resources Freese and Nichols, Inc. 4055 International Plaza, Suite 200 Fort Worth, Texas 76109 817-735-7236 817-735-7483 fax www.freese.com From: Keith Marvin [mailto:KMarvin@coppelltx.gov] Sent: Tuesday, October 01, 2013 12:58 PM To: Patrick Miles Cc: John Rutledge; Kenneth Griffin; Michael Garza; Howe, James (James.Howe@txu.com) Subject: RE: North Lake Dam -- Internal Drainage System Patrick, We now own the property, and James Howe is under contract with the City of Coppell to represent us on site. Please feel free to contact James directly to schedule a site visit. James can be reached at 972-834-2981. We are in favor of any modifications that will reduce our ongoing maintenance effort. Keith Marvin, P.E. City of Coppell 972-304-3681 From: Patrick Miles [mailto:jpm@freese.com] Sent: Wednesday, September 25, 2013 1:18 PM To: Kenneth Griffin; Keith Marvin Cc: John Rutledge Subject: North Lake Dam -- Internal Drainage System As part of flattening the slope of the Main Dam, the downstream toe will extend beyond the existing toe and cover a manhole associated with the internal drainage system (Manhole #1 in the attached figure). At a minimum, this manhole will be extended vertically (about 10 feet) to account for the additional height of the new slope at this location. Raising this manhole would satisfy any impacts caused by extending the downstream toe, and the drainage system would effectively remain at status quo. However, there may be additional improvements that can be made to the drainage system. Inspection reports from the last several years indicate that Luminant has had issues at Manhole #3 and needed to pump water out of it quite frequently because of backwater effects at the downstream end of the drain outlet. A possible improvement to alleviate this issue is abandoning the drain lines downstream of Manhole #2 and providing an outlet at this location. In order for this to be possible, we need to confirm a few elevations around Manhole #2. As you can tell from the figure, the 2-foot LiDAR contours indicate that there may be some issues with drain line elevations. Knowing that LiDAR data in low-lying areas can often be inaccurate and error-prone, we would like to take a few field measurements to confirm whether these improvements might be possible or not. If these additional improvements are something the City would like to consider, when can we schedule a time to make a quick visit to the site to make these measurements? Let us know what additional guidance you may have. Please feel free to give me a call with any questions you may have. Thanks. Patrick Miles, P.E. Water Resources Freese and Nichols, Inc. 4055 International Plaza, Suite 200 Fort Worth, Texas 76109 817-735-7236 817-735-7483 fax www.freese.com Please consider the environment before printing this message. ________________________________ This electronic mail message is intended exclusively for the individual or entity to which it is addressed. This message, together with any attachment, may contain the sender's organization's confidential and privileged information. The recipient is hereby notified to treat the information as confidential and privileged and to not disclose or use the information except as authorized by sender's organization. Any unauthorized review, printing, retention, copying, disclosure, distribution, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipient is prohibited. If you received this message in error, please immediately contact the sender by reply email and delete all copies of the material from any computer. Thank you for your cooperation. ther these improvements might be possible or not.<o:p></o:p><o:p> </o:p>If these additional improvements are something the City would like to consider, when can we schedule a time to make a quick visit to the site to make these measurements? Let us know what additional guidance you may have.<o:p></o:p><o:p> </o:p>Please feel free to give me a call with any questions you may have. Thanks.<o:p></o:p><o:p> </o:p>Patrick Miles, P.E.<o:p></o:p>Water Resources<o:p></o:p><o:p> </o:p>Freese and Nichols, Inc.<o:p></o:p>4055 International Plaza, Suite 200<o:p></o:p>Fort Worth, Texas  76109<o:p></o:p>817-735-7236<o:p></o:p>817-735-7483 fax<o:p></o:p><o:p> </o:p><a href="www.freese.com">www.freese.com</a><o:p></o:p><o:p>  </o:p><img border="0" width="130" height="70" id="Picture_x0020_1" src="cid:image001.gif@01CEBEAB.0E535370" alt="Description: cid:image001.gif@01CBB0E0.4E80AE10"><o:p></o:p><o:p> </o:p> Please consider the environment before printing this message.<o:p></o:p><div class="MsoNormal" align="center" style="text-align:center"><hr size="2" width="100%" align="center"></div>This electronic mail message is intended exclusively for the individual or entity to which it is addressed. This message, together with any attachment, may contain the sender's organization's confidential and privileged information. The recipient is hereby notified to treat the information as confidential and privileged and to not disclose or use the information except as authorized by sender's organization. Any unauthorized review, printing, retention, copying, disclosure, distribution, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipient is prohibited. If you received this message in error, please immediately contact the sender by reply email and delete all copies of the material from any computer. Thank you for your cooperation.<o:p></o:p></div></body></html>