San Pedro Fashion Mall in downtown Los Angeles expands with presold stores over a subterranean PARKING STRUCTURE. Photos courtesy of Ace Egineering

Underpinning a brick building directly adjoining the 30 foot deep parking structure. 

Typical auger drilling using bullet teeth in sand and cobble strata.

A Parking structure topped by Retail stores adjoins the existing San Pedro Fashion Mall in Downtown Los Angeles.  Ace Engineering and August Construction worked together to shore two story subterranean pit that would come to house the parking structure.  The shoring engineer was Burnett & Young.  All the fashion stores were presold by the owner during the construction, attesting to the success of stores with parking in the downtown area.

Completing the excavation 30 feet below street level with two rows of tiebacks

Drilling with a Klemm double head using casing in caving sands and cobbles.