Like the maestro of a Wagnerian opera, Michael Marchesano conducted a chorus of 400 workers, 19 concrete pumps, 208 mixers and eight batch plants to perform a 19.5-hour continuous concrete placement for the Wilshire Grand Center's foundation. A congested jobsite in the middle of downtown Los Angeles added to the drama, as did hundreds of onlookers, dignitaries and even a full marching band. But the entire operation went off without a hitch, thanks to a year of intricate pre-planning spearheaded by Marchesano, a general superintendent with Turner Construction.