Marjol Battery Site
Spring site maintenance activities to begin end of week of April 29, 2013.
 
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Summary of Corrective Measures Implementation (CMI) Process

Post-Construction  Maintenance and Monitoring

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Final (100%) Remedial Design

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Stormwater Management System

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Stormwater Management Structures

In order to control stormwater at the Site both during construction and after construction activities have ended, and to keep sediment (small soil particles that are carried along in water) on the Site and out of the Lackawanna River, a basin and other drainage features such as check dams and swales were constructed as outlined in the USEPA/PADEP-approved 100% Design Plan for the Site (Click here for more information on the Final 100% Remedial Design Plan). The stormwater management system consists of several items as described below.  (Click on the name of the structure to view a picture of the structure):

1) Swales - to direct the flow of water on the Site to the sedimentation basin.

2) Check Dams (elevated rows of rocks in the swales) – constructed to slow the water down as it flows through the swales.

3) Sedimentation basindesigned to discharge water from up to a 100-year storm without overflowing through the emergency spillway; rainwater that falls on the Site is directed to the basin.  The sedimentation basin is designed to enable sediments to settle out prior to the water discharging through the skimmer since water from areas without established vegetation that drain to the basin may carry sediment. In the summer of 2012, the sedimentation basin was converted to a stormwater management basin.  (Click here to read about the basin conversion.)

4) Baffle - a fence with fabric on it to slow down the water in the basin after it comes down from the swales and allow additional sediment settling.  (Removed in summer 2012 as part of basin conversion.) 

5) Skimmer - when water is released from the basin, it is released through a skimmer which is a 4-inch plastic tube that skims the water off the top of the basin and into a discharge pipe. The water then flows out through the discharge channel and into Sulphur Creek.  (Removed in summer 2012 as part of basin conversion.)

6) Outlet structure – water from the basin flows through the skimmer and into the outlet structure which discharges the water into the discharge channel via a pipe to the opposite side of the basin berm.  The top of the outlet structure also has an open grate that allows water to discharge at a much higher rate than the skimmer if it is a heavy enough rainfall that the skimmer can’t keep up with the water coming into the basin.  (Click here to view a picture of water discharging from the outlet structure.)  (Note: In the summer of 2012, the skimmer was removed as part of basin conversion.)

7) Emergency Spillway - a rock reinforced discharge channel for the basin that would carry flow only if the outlet structure is blocked and can’t discharge water or if it is more rain that what is expected in a 100-year storm.

(Click here to go back to the Stormwater Management System page.)

 

Page Last Modified Tuesday September 18, 2012 12:47:26 PM

 

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