From the 1930's through the 1960's the U.S. Army disposed of building debris and waste soil on the tops of the bluffs and over the cliffs at the south side of the Golden Gate above north Baker Beach. Now, decades later, it has been decided that something has to be done with this area in order to save the environment.

Challenging project

The waste material covers sensitive ecological habitat and obscures parts of the historical coastal artillery batteries. The site and the project requirements presented a number of interesting challenges. One of the challenges was the need to excavate class 1 hazardous materials from the cliff face and transport them by conveyors up 40-degree slopes over a distance of 1200 lineal feet. The use of the spider climbing excavators and the ALLU SM 2-12 Screener Crusher allowed the excavated material to be preclassified before transporting it. This increased remarkably the efficiency of the conveyor system. Because the oversized debris was screened and crushed, the conveyors were able to carry more consistent loads. The ALLU Screener Crusher allowed the material to classify at the point of excavation, thus eliminating the unnecessary removal of uncontaminated, native rock. This process equated to a significant savings to the customer.

After the work is done

Once the removal work is complete, improved recreational trails will be constructed military fortifications will be restored and natural area restoration and volunteer stewardship will begin as a part of the Trails Forever initiative.

Background of Screener Crusher

In the year 1991 ALLU Finland Oy invented a new attachment for excavators and wheel loaders. ALLU Screener Crusher is now used world wide. During these past 17 years ALLU Screener Crusher has been used in hundreds of different applications, including back filling the pipe line trenches, soil stabilisation, contaminated soil handling, cleaning up the infantry mines, processing of numerous different kind of materials, like: top soil, clay, peat, sand, sludge, compost, lime, bark, glass, wind shields, asphalt, bricks, demolition rubble, etc. In its main product sector, the screener-crushers, ALLU Finland Oy is the market leader in the whole world.