From: Brad Hartjes [mailto:BHartjes@cmlavoie.com]
Sent: Thursday, August 10, 2006 11:53 AM
To: jhall@downers.us; magz520@comcast.net
Subject: Nelson Court grading along Carpenter

Jon, attached is a pdf file of our grading along Carpenter, between the catch basins, the small berm just east of the catch basins, sidewalk and retaining wall.  As you can see I have slightly revised the grades between the berm and the retaining wall to show that the sidewalk slope will not exceed 2%.

 I did not need to revise any of the locations of the berm, catch basin, sidewalk or retaining wall, I simply provided a more detailed grading of the area, showing that the slopes will not be greater than the allowable.  I then raised the wall up 0.5 ft. at this location to revise the grading between the walk and the wall from 3:1 (allowable) to 4:1 (preferred).  The slope in the grass area will not exceed 4:1. 

 This should show that we can provide the necessary berm to contain the HGL, while still grading the sidewalk at a 2% cross slope.  We also will not exceed the 4:1 in the grass areas.

 Hopefully this will allow for the Public Works department to grant final approval of our engineering plans.

 As we discussed in your office, I will be forwarding to your office the permits I have received from IEPA etc...

 Please let me know if you have any questions.

Brad Hartjes, P. E.
Project Manager
C. M. Lavoie & Associates
1050 W. Route 126
Plainfield, Illinois 60544
T 815.254.0505
F 815.436.5158

Grading Detail for Carpenter St. Catch Basin SB3