Two years ago I bought a 175hp tractor and scraper to pull behind it. I bought the tractor at auction for 18000 and then paid another 3000 in repairs. The scraper would move about ten yards of dirt every ten minutes behind the dam. I did this for about a year and a half on the weekends spending about 2000 in diesal. I could not complete the entire project with the scraper and had to call mike Otto to help me finish the parts that had to be done with a dozer. After the project was finished I sold the tractor for 18000. The cost was my time and the diesal along with the repairs to the tractor. I think that this was probably the cheapest way to complete the job if you have lots of extra time.