What about the Internet Archive? Sometimes books and standards are uploaded there. Let me check ia.arc. Searching for ASCE 11-99. There's an upload: asce-11-99.pdf. Let me see. The date is 2005, but the standard is from 1999. Wait, that might be the second edition. ASCE standards sometimes have superseded versions, but the user specifically asked for 11-99. The Internet Archive might have it. Let me try accessing the link. The file is there, but I need to make sure it's a legal copy. Not sure if the Archive has the rights to host it.