Site K Construction (2009)
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Modification of Existing Stormwater Drop Inlets: Weir walls with a compound weir plate were installed within two drop inlets at the intersection of Atlantic and K Avenues. These weirs diverted stormwater out of the stormpipes and away from the outfalls and into the DIS. The stormwater was diverted into distribution pipes installed beneath the road and sand dunes |
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Installation of DIS distribution pipes: Two pipes, one 6 inches and the other 12 inches, were routed from the modified drop inlets, beneath the roads and dunes, to the DIS. The 6 inch pipe entered the southern end of the first bank chambers, while the 12 inch pipe was split and entered both banks of chambers. |
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Distribution pipe input into the DIS: The 12 inch distribution pipe was split between the two banks of chambers. |
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DIS chamber bank: The DIS consisted of two independent banks of open-bottomed, HDPE chambers. A 1 ft layer of gravel was placed in the trench, then a nylon mesh was placed on top of the gravel and the chambers on top of the mesh. The chambers were secured to one another using screws and a 2 ft thick gravel layer was placed around the bank of chambers. A geotextile fabric was then wrapped around the sides and top of the chambers. |
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Monitoring well installation: Groundwater and water table monitoring wells were placed in the dune surrounding the DIS. The wells were made of PVC pipe and jetted into the dunes. The groundwater wells were used to collect groundwater samples and the water table wells were used to continously monitor the elevation of the water table. |
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Dune revegetation (2009): Installtion of the DIS required digging trenches with heavy equipment, resulting in the loss of natural vegetation, therefore, native dune plants were planted post-construction, during the growing season. |
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Site K, one year later (2010): Just over one year from installation, the Site K DIS is performing well. Dune vegetation has been well reestablished and continues to grow and fill-out the dune area. |