LEADING EDGE

An excavator loads a jaw crusher which feeds a screen, that produces three different sized materials,
with multiple conveyors. The materials were used to replace manufactured wall blocks, purchased
stone and engineered structural fill.
Civil & Infrastructure Group Update
By: Jim Rhodes, Civil & Infrastructure Group Manager
WBI’s Civil and Infrastructure group (WBICI) recently started a project on site where the geo-tech
report indicated the potential need for significant un-rippable rock removal. As WBICI went through
the preconstruction process, minimal available soil borings were entered into our take-off software
to determine the amount of rock on site and locations. Based on the info gathered, the engineer and
owner were able to evaluate their needs and associated design in order to mitigate the amount of rock
encountered before WBICI ever arrived on site.
Once WBICI mobilized, the first order of business was to pre-drill the entire site and confirm the quantities
that were derived from the geo-tech report. As is sometimes the case, it was found that many of
the borings missed some the below existing grade rock due to the fact that the strata had many more
peaks and valleys than would normally be seen on a similar site. This fact doubled the amount of expected
rock on site. All of the rock was mapped and entered into the GPS site model that WBICI was
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Two rock drills work in the background as an excavator loads a rock truck with overburden,
prior to digging the previously blasted shot rock
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