After our resubmittal meeting, I had a few things to change – the site drainage features and the limits of grading on the property.  The grading limits were simple to take care of – just remove some proposed contour lines on the property.

The County reviewers wanted us to move the drainage dispersion trench out of the wetland buffer.  This really doesn’t make sense to me since all of the water naturally drains to the area I located it in, but apparently it had to go in order to get our permit approval.  If I was going to relocate the drainage feature, I was going to change the type too.  I really didn’t want to have a soggy backyard, so I changed it to being a drywell.  In order to use a drywell system, you have to calculate the amount of roof runoff would be directed towards the drywell, and using the soil type you can appropriately size the drywell.  Here’s my calcs:

Drywell Sizing Calculations

With the drywell sizes for both the driveway and for the roof runoff I was able to place them on the property in an area that’s outside of the wetland buffer and that was it!

Final Site Plan – Sheet 1

Final Site Plan – Sheet 2

Final Site Plan – Sheet 3

With the new site plan, I got a call from the reviewer and we passed – he was ready to approve our plans!  The last step to getting his final approval is to get our drainage BMP’s recorded with the county.  With that recording number he’ll sign off and we’ll be done with the Civil Review.