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Dea On A Push-Pull
Dea On A Push-Pull
A Push-Pull is a particular type of scrapper that works in tandem with another one of the same model. Here, I am operating a CAT model 637 for FERMA of Union City, CA. The project is contaminated soils containment problem. The property belongs to Chevron Oil Company and was the original site of their tank farms. The Problem: For over 80 years, petroleum products and other chemical contaminants had been allowed to leak into the ground, leeching into the water where it returned to ruin the ecosystem of San Francisco Bay Area. The Solution: After the soil was identified as contaminated, it was then removed and stock piled by the scrappers. An opened earth remained and the was bottom lined with clay to a depth of ten feet. Subsequently, the sides were lined to a thickness of about eight feet as teh contaminated soils were returned to the pit. Since clay is impervious to water, the contaminated soil could be safely returned in these pits by the same scrappers. They were finally covered with clay caps. In the end, it looks as if we make pimples in the earth. Epilogue: I suppose there may have been better ways to sterilize years of polluting the ground water. One idea was to burn the soil in natural gas ovens until all contaminates were released into the atmosphere. At that time, no one thought they would be counting their carbon foot prints either. Fortunately today, the area is in a natural state were draught resistant plants grow that are also native to these parts of the country. This at least brings the ecosystem bback to the way it was before the tank fram. I hope it remains that way.
YouTube | June 21, 2008
