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Published March 12, 2018
Expiration date: 4/1/2018



   City of Mandeville c/o Principal Engineering, Inc. at 1011 North Causeway Boulevard, Suite 19, Mandeville, Louisiana  70471.


LOCATION OF WORK:  On Lake Pontchartrain, east of Sunset Point Park, on Massena Street, Mandeville, in Saint Tammany Parish, Louisiana, as shown on the attached drawings.


Hydrologic Unit Code:  08090202 - Lake Pontchartrain

Latitude:  30.36110, Longitude: -90.08419


CHARACTER OF WORK:  Dredge, fill, and grade to construct a marsh habitat within a proposed storm water retention and treatment system.  Upon completion of construction, the designed storm water retention/treatment system would receive storm water runoff from the City of Mandeville via the Galvez and Massena outfalls and attenuate the runoff to remove/reduce sediments and other pollutants prior to discharging into Lake Pontchartrain.  The proposal consists of two redesigned outfalls discharging from an existing forested wetland area into the impoundment, a berm to attenuate the runoff for treatment, a weir for controlled release into the lake, a pedestrian-bicycle path over the berm, constructed marsh platforms, an intertidal lagoon, an outfall channel to the weir, and shoreline erosion protection features.  The applicant proposes to dredge 9,930 cubic yards of material from 2.87 acres of non-vegetated tidal bottoms, to create a temporary five foot deep access channel and work area for deployment of work barges and other construction equipment to the construction site.  The dredged materials would be side cast into 3.14 acres of non-vegetated tidal bottoms adjacent to the channel and placed back into the channel after completion of the project.  The applicant also proposes to dredge 8,560 cubic yards from 3.53 acres of non-vegetated tidal bottoms to construct the storm water retention impoundment, associated wetland terraces, and other associated impoundment structures.  The project will also require installation of 1,300 square feet of steel sheet piling, 1,120 cubic yards of concrete, 3,860 cubic yards of bedding and armoring stone, and 260 cubic yards of riprap, and 10,120 cubic yards of other fill material to construct the impoundment berm and appurtenant structures.  The completed impoundment structure would impact approximately 10.27 acres of non-vegetated tidal bottoms by conversion to marsh habitats, open water features, and permanent fill.  This project was previously advertised under the same number on 18 February 2014.  No permanent adverse impacts to special aquatic sites are proposed; no compensatory mitigation is anticipated at this time.