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7 months ago

West Lake CAG NRRB Submission REVISED ADDENDUM January 4 2018

This is concerning when

This is concerning when one looks at the aerial images of just how close the communities next to and around this Superfund site came to catastrophe! We will never know the impact this flood would have had on the Earth City Levee had the Monarch Levee upstream not collapsed or if the abandoned railway embankment on the St. Charles side of the river had not also collapsed. The Norfolk and Western Railway Embankment was built circa 1932 as that is when the bridge across the Missouri River to St. Charles was completed. The image below shows the levee system around the Superfund site. Page 34

On the other side of the railway embankment is an area that is part of the Missouri Bottoms Levee District (Agricultural Levee build for smaller than 100-year flood events) which has consistently flooded with heavy rain events. When looking at the Railway Embankment and the MO Bottom Levee area, no flood gates exist to keep flood waters out of the Earth City Levee District if water over tops the roads in the area. No inspection reports could be found for the Railway Embankment. Also note that Cowmire Creek lies just East of this Embankment on both the North and South side of the Embankment. Per a flood insurance report, “The excess amount of waterflow leaves Cowmire Creek by flowing southwest across Route 115 (St. Charles Rock Rd) and the High Stages which produce this overflow are created by the undersized culvert through the Norfolk and Western Railroad Embankment”. http://environmentalarchives.com/doc/STL/1982-08%20- %20City%20of%20Bridgeton,%20Missouri%20-%20Flood%20Insurance%20Study.pdf We call your attention to studies done by the Army Corp of Engineers focused on downstream flooding that neglected to take into consideration localized flood impact due to heavy rains, such as the 9.18 inches which fell on the St. Louis Region Dec 26-28, 2015: 4.87 in. (Dec 26), 1.72 in (Dec Page 35