Ok here is a quick overview. Bought a 80 yard load of Pine mulch. (supplier states it is 75% pine and 25% hemlock). It was delivered on a walking floor trailer. I then peaked it with my 724. It was delivered on thursday of last week, and peaked immediatly. Friday night i went to preload 2 trucks for Saturday morning. I took a ten yard bucket full, and noticed the outside 16 " was grey. It almost looked like ash , or it burned. I called supplier and of course he said, "he has had no complaints". They ship around 1500 yards a day of this material, so it is freshly ground every day. I wont use this on any customers yard, in fear it will kill the plants. I think he got some bad loads. Maybe his supplier snuck in some loads of maple or oak bark. Which from what i gather has, a ton of acid in it. I am thinking way to high of acid content. Any thoughts?????