2019-03-28_REPORT - C1981019

• Permit No: C1981019
• IBM Index Class Name: Report
• Doc Date: 3/28/2019
• Doc Name: Quarterly Fill Inspection Report
• From: Tri State Generation and Transmission Association, Inc
• To: DRMS
• Annual Report Year: 2019
• Report Quarter_Month: 1
• Permit Index Doc Type: Waste Pile/Fill Report
• Email Name: ZTT
• Media Type: D
• Archive: No

South Tavlor Fill Inspection Certification
On March 261, 2019 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 30°F and sunny, with 12"-24"
of snow on the ground.
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 ceased on the 8100' level
of the temporary out of pit stockpile.
The current water level reading of the piezometer well was 217.0' from the ground surface, a
decrease in water level of 8.4' from the previous quarter. The West Taylor Fill underdrain was
freely flowing at the time of inspection.
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
have taken place within the East Taylor fill during this quarter.
No structural weakness, signs of instability, or other hazards were noted at the time of
inspection.
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.
1 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.