NY -- Standard&Poor's CreditWire 5/4/98 -- Standard&Poor's today assigned its single-'A'-plus rating to California Health Facilities Financing Authority's insurance health facility revenue bonds series 1998A issued for H.E.L.P Group. The H.E.L.P. Group is an affiliation of eight different nonprofit public benefit corporations, which provide mental health, special education, and residential programs to adolescents, adults and families in the San Fernando Valley and other portions of Los Angeles County. Proceeds will be used to refund the series 1991 bonds and relocate one of the H.E.L.P. Group's facilities. Security for this issue is based on the state of California's Health Facilities Construction Loan Insurance Program. In the event of a default, the state can continue to make regularly