C.68 APPROVE and AUTHORIZE the Chair, Board of Supervisors, to execute a contract amendment with Contra Costa Transportation Authority (CCTA), effective June 20, 2007, to increase the payment limit to the County by $55,500 to a new payment limit of $3,251,000 and amend the scope of work for right-of-way and other technical services provided by the County to CCTA for State Route 4 West Gap project,