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' COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT WATER QUALITY CONTROL COMMISSION ' REGULATION NO. 31 ' THE BASIC STANDARDS AND METHODOLOGIES ' FOR SURFACE WATER (5 CCR 1002-31) 1 1 ADOPTED: May 22, 1979 ' AMENDED: December 12, 1983 AMENDED: June 2, 1987 ' AMENDED: AMENDED: June 6, 1988 August 1, 1988 AMENDED: August 7, 1989 AMENDED: October 8, 1991 ' AMENDED: May 4, 1993 AMENDED: August 2, 1993 AMENDED: October 4, 1993 ' AMENDED: December 6, 1993 AMENDED: January 10, 1995 AMENDED: January 8, 1996 AMENDED: January 13, 1997 ' AMENDED: July 14, 1997 AMENDED: January 12, 1998 AMENDED: January 11, 1999 ' AMENDED: August 15, 2000 AMENDED: November 7, 2000 ' EMERGENCY AMENDMENT: November 8, 2000 AMENDED: Februa 13 2001 ry , Received MAR 21 2001 DrysDn nM el ~S 8 Gep o9Y FFECTIVE: July 10, 1979 FFECTIVE: January 30, 1984 EFFECTIVE: July 31, 1988 EFFECTIVE: July 31, 1988 EFFECTIVE: September 30, 1988 EFFECTIVE: September 30, 1989 EFFECTIVE: November 30, 1991 EFFECTIVE: June 30, 1993 EFFECTIVE: September 30, 1993 EFFECTIVE: November 30, 1993 EFFECTIVE: January 31, 1994 EFFECTIVE: March 2, 1995 EFFECTIVE: March 1, 1996 EFFECTIVE: March 3, 1997 EFFECTIVE: August 30, 1997 EFFECTIVE: March 2, 1998 EFFECTIVE: March 2, 1999 EFFECTIVE: December 22, 2000 EFFECTIVE: March 20, 2001 EFFECTIVE: November 8, 2001 EFFECTIVE: March 30, 2001