./ flatiron west, inc./sukut construction, inc., joint venture, in the amount of $79,781,662 and an increase in the contract duration of up to 371 consecutive calendar days; and authorize the general manager to approve future modifications to the contract for a total revised contract amount up to $529,225,308, and for a total revised contract duration up to 2661 consecutive calendar days. city clerk: item 12: 12. approve an increase in the construction cost contingency for contract no. wd-2551, calaveras dam replacement project, with dragados-usa, inc./ flatiron west, inc./sukut construction, inc., joint venture, in the amount of $79,781,662 and an increase in the contract duration of up to 371 consecutive calendar days; and authorize the general manager to approve future modifications to the contract for a total revised contract amount up to $529,225,308, and for a total revised contract duration up to 2661 consecutive calendar city clerk: item 12: 12. approve an increase in the construction cost contingen