20080355 Ver 1_Staff Comments_20080311

08-0324 Little Alamance Creek AND 08-0355 Brown Branch
Subjec : 08-0324 ittle Alamance Creek AND 8-0355 rown Branch
From: An ucas <Annette.Lucas@NCMai .
Date: Tue, 11 Mar 2008 14:17:45 -0400
To: Eric Kulz <[e-mail]>
CC: Sue Homewood <Sue. Homewood@ncmail. net>, Annette Lucas <[e-mail]>
Eric,
Just did a quick review of the level spreaders associated with these projects. I
agree with Sue - most of the level spreaders appear to be placed adjacent to level
spreaders that are too steep. I also agree with Sue that improperly designed level
spreaders will do more harm than good AND that it is essential to make sure these
designs will work in order for the project to be successful.
Here are some bullets I use a lot in requests for more information:
1. Please provide a Level Supplement Sheet for each proposed level
spreader that will be used on the site (including both worksheets,
Design Summary and Required Items Checklist), as well as all of
the required items. The BMP Supplement Forms are available on the
DWQ web site at: http://h2o.enr.state.nc.us/su/bmp forms.htm.
2. If any of the filter strips are too steep to allow for diffuse
flow, then pease either relocate the level spreaders to a location
where the filter strip slopes are appropriate for level spreaders
or provide a BMP or series of BMPs that removal a minimum of 85
percent TSS and 30 percent TN from the stormwater generated by
this project. For each proposed BMP, please provide a completed
BMP Supplement Form, with all the required items. The BMP
Supplement Forms are available at:
http://h2o.enr.state.nc.us/su/bmp_forms.1-itm. Please include both
the Design Summary and the Required Items Checklist
along with all the required items listed therein.
Good luck! - I left the files in your mailbox.
Annette
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