I recommend talking with a remediation company, preferably one that tackles projects (such as landfill caps, slurry cut-off walls, excavations) requiring heavy equipment. If you're familiar with heavy equipment and their production rates you may be able to find a position as an estimator. From...
Another resource that may be helpful is the Site Planning and Design Technical Manual (TM 5-803-14)that can be found on the US Army Corps of Engineers website. It discusses the design process, site analysis, and gives design guidelines. I don't recall the exact web address, but if you reach...