NEW YORK (Standard&Poor's CreditWire) Sept. 13, 1999--Standard&Poor's today assigned its double-'A'-plus rating to New Jersey Educational Facilities Authority's $4.32 million college capital projects fund issue bonds series 1999E dated Sept. 1, 1999, due Sept. 1, 2014, issued for Middlesex County, N.J. The bonds are scheduled to sell Sept. 14, 1999. The rating is based on the underlying creditworthiness of the county and reflects: -- A diverse and growing economic base, -- Above-average wealth and income levels, -- Strong financial performance and position, and -- Manageable debt burden. The bonds are secured by revenues received by the authority from loan repayments made by the county pursuant to a bond purchase agreement. Under that agreement, the authority will