2016-06-28_REPORT - C1981019 ‎(2)‎

• Permit No: C1981019
• IBM Index Class Name: Report
• Doc Date: 6/28/2016
• Doc Name: Quarterly Fill Inspection Report
• From: Tri-State Generation and Transmission Association, Inc
• To: DRMS
• Annual Report Year: 2016
• Permit Index Doc Type: Waste Pile/Fill Report
• Email Name: JRS
• Email Name: ZTT
• Media Type: D
• Archive: No

South Tavlor Fill Inspection Certification
On June 14, 2016, 1 inspected the South Taylor Fill areas, which includes the East Taylor Fill
and the West Taylor Fill, identified on Map 23A and Map 45 of the approved permit. The
purpose of this inspection was to observe the status of the fill placement. This inspection is
necessary to satisfy the requirements of CDRMS Rule 4.09.1(1)(c) and Rule 4.09.1(11).
Weather conditions at the time of inspection were approximately 62°F and Partially Cloudy.
West Taylor Fill with A -A' and B -B' Underdrain Area No new activity has occurred within the
permanent West Taylor Fill since last inspection. The East Tributary of the West Taylor fill has
been rip -rapped up to the 7850' elevation (approximately). The West Tributary of the West
Taylor fill has been rip -rapped up to the 7820' elevation. Dumping has concluded on the 8100'
level of this stockpile.
The current water level reading of the piezometer well was 221.2 feet from the ground surface,
an increase of 3.3 feet from the previous quarter.
No structural weakness, signs of instability, or other hazards were noted at the time of
inspection.
East Taylor Fill with C -C' Underdrain Area: No activity other than rock crusher operations
has taken place within the East Taylor fill during this quarter.
Design requirements for the spoil pile are addressed in Volume 13, Exhibit 21, Item 1,
Introductory Letter. Inspection requirements during construction are further detailed in Volume
12, Section 4.09.
No structural weakness, signs of instability, or other hazards were noted at the time of
inspection.
I am a Registered Professional Engineer in the State of Colorado. Being familiar with the
Colowyo operation, and relying on the information provided to me by Colowyo Personnel, the
construction activities related to the West and East Taylor Fill are in conformance, to the best of
my knowledge and experience, as specified in the Introductory pages and the associated report
found in Volume 13, Exhibit 21, Item 1, and other applicable requirements of the approved
permit documents, a portion of CDRMS Permit C-1981-019.