Site Imbalance

Thank you both for responding and I'm seeing that there is a lot to improve in the model.

My excavator is saying that I need approximately 1,000 cu yd of fill to get to the final grading.  I attempted to eliminate the garage and porches from the calculation by setting those areas to the grade since I will need to fill with gravel and I'm just trying to figure out what the backfill and grading imbalance is going to be.    I had modeled a feature (new grading around house), and 4 platforms (basement, 2 porches, and garage).  With this model, which I provided via the link, I came up with approximately -200 cu yds. 

I'll watch the video and attempt to rework the model.  I'm just not understanding how the creation of the features and platforms are interacting with each other to get the final imbalance.

Mike