Where do i find free dirt for landscaping?

I live in the bay area and my local boys and girls club are trying 2 re-build a base ball field. I need to find someone to deliver it to an El Sobrante school so that the club can be on their way. I looked on craigs list and people will only deliver within a close distance to their own projects. So if any one knows of any bay area no-profit companys that will deliver some free dirt please let me know......Thanks