For those interested, a plan view of the design shown in the below videos can be viewed at the following link: Deal Library Plan
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Environmental Site Design (ESD) Practices Report – South County Library
We provided site and stormwater design services for the Anne Arundel County South County Library expansion in southern Maryland a few years ago. An “in the neighborhood” site visit today found that construction was completed earlier this winter. The design accomplished all stormwater management (including retrofit of un-managed areas due to Chesapeake Bay Critical Areas requirements) with Environmental Site Design (ESD) practices. The practices focused on careful grading of both impervious and pervious areas, resulting in impervious area disconnects and wet swales. A series of videos follow that walk through the practices follow.
Charm City: 1903 | Shorpy Historic Photo Archive
From the Other Interesting Stuff Local file: Baltimore Harbor in 1903.
Go to Shorpy‘s and check out the full size version – link below. What do YOU recognize in the photo, fellow Baltimoreans?
Charm City: 1903 | Shorpy Historic Photo Archive.
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The EPA has spoken
The EPA has published “Effluent Limitations Guidelines and Standards for the Construction and Development Point Source Category; Final Rule” which will dramatically change sediment control throughout the US over the next 4 years. We are still reviewing, but most significant is the require to sample discharges from construction sites and to meet numeric effluent limits that include turbidity. Use of flocculants is pretty much mandatory on sites that are over 10 acres.
It looks like the turbidity limit is 280 (corrected from an earlier post) nephelometric turbidity units (NTUs) – which is just about crystal clear. The following photo shows 5, 50, and 500 NTUs. Construction runoff will need to be between the two right samples. This will be a complete game changer for sediment control.
A good summary article is at: http://www.erosioncontrol.com/january-february-2010/epa-effluent-guidelines.aspx
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Sustainable Stormwater Management 