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HomeMy WebLinkAbout20090769 Ver 1_Email_20090728Sonia C)R 0'Z&9 ,,JI-wtScl? From: Lespinasse, Polly Sent: Tuesday, July 28, 2009 2:04 PM To: Cheely, Erin K Cc: Simon, Trish; Steven.W.Lund@usace.army.mil; Gregory, Sonia Subject: B4468 Cleveland County Hi Erin, Hope you are doing well. I have the PCN for the above referenced bridge replacement project in Cleveland County (over Sandy Run Creek) and have a couple of questions. They are: 1. It looks like the 90 feet of stream impact are associated with fill/stream relocation? Sheet No. 4 of the plans doesn't very clearly identify the reason for the impact. 2. It is not clear to me whether any bridge bents will be in the stream based on the drawing on Sheet No. 5 (water surface elevation isn't clearly depicted). 3. The stream, which will be relocated to the ditchline, currently contains bedrock throughout the reach. Based on the drawings, it appears that the proposed grade of the relocated stream will be approximately 6%. The application indicates that the ditch will be lined with PSRM. DWQ is concerned that, based on this slope, matting will not be adequate. Perhaps, based on the existing condition of the stream, a step pool system would be more appropriate? Also, establishment of the new ditchline may be difficult due to the presence of bedrock. How does NCDOT propose to address that issue or has it already been investigated? FYI -The PCN indicates that the UT to Sandy Run is intermittent. The ACOE documentation appears to indicate that the UT is perennial. Based on my field observations, DWQ would consider this stream perennial. This will only impact NCDOT if further impacts, which exceed 150 linear feet, are proposed. Please let me know your thoughts. Thanks for your help! Polly Lespinasse - Polly. Lespinasse@ncdenr.aov Environmental Specialist North Carolina Dept. of Environment & Natural Resources Div. of Water Quality 610 E. Center Ave., Suite 301 Mooresville, NC 28115 Ph: 704.663.1699 Fax: 704.663.6040 E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third parties.