Providing limits on the liability of certain nonprofit corporations providing day training and habilitation services for adults or daytime developmental achievement services for children with mental retardation or related conditions or securing or maintaining homes for orphaned, homeless, abandoned, neglected or mistreated children for claims resulting from the care or treatment of the individuals or the activities of the individuals while in the care of the nonprofit corporation, insurance purchase requirement; excess liability insurance to constitute a waiver of the liability limits, limit (ra)