PROJC00141

• Contract/PO #: C150135
• Contractor Name: Silt Water Conservancy District
• Contract Type: Loan
• Water District: 0
• County: Garfield
• Bill Number: MC3
• Loan Projects - Doc Type: Feasibility Study

ApPENDIX 1)

STAlE OF COLORADO

OIVISION OF WATER 'RESOURCES
WATER DIVISION 5
Office of the State Engineer
Department of Natural Resources
POBox 396 (50633 U S Highway 6 & 24)
GlenwQod Springs CO 81602
Phone [phone]
FAX [phone] (call first)

April 23, 2003

Bill Owens
Governor

Greg E. walcher
Executive Director

SCOTT DODERO
SILT WATER CONSERVANCY DISTRICT
PO BOX 216
SILT, CO. 81652

HalO. Simpson
State Engineer

Alan C. Martellaro
Division Engineer

RE: GRASS VALLEY AKA HARVEY GAP DAM
W. Div.5, DAMID: 390108

Dear Scott:

Enclosed are two copies of my report for the inspection of Harvey Gap Dam that was conducted on
April 11, 2003. Please note and implement my recommendations on Page 2 of the inspection report.
Also please sign, date, and return the extra copy of page 2 of the inspection report to the post office
box at the top of this letter.

We were glad to see the dye test being performed to try to locate the seepage entry area and your
engineer should submit a report of his findings. Although the submitted monitoring and readings
taken during the inspection show no significant changes in the seepage (within the accuracy of
the monitoring methods), you should continue to move forward with seepage investigations and a
plan to resolve the problems for the long term safety of this dam. In the meantime, you should
continue the monitoring program that has been established and continue to operate the reservoir
with a slow fill during the winter and spring to maximize the time the reservoir is below gage 45.

To obtain more consistent spillway seepage readings as the seepage is sometimes measured
differently depending on who is doing the measurement, you should install a gage along the side of
the weir with zero corresponding with the bottom of the V. The spillway seepage weir,
measurements should be continued and recorded along with the reservoir level during your other
monitoring visits to the dam. Eventually, a major rehabilitation of the spillway will have to be
made under the direction of an engineer because of the inevitable continued deterioration. It is a
good idea to continue the policy of not letting the reservoir spill under normal circumstances.

With the possibility that the reservoir may drain this year due to the continuing draught
conditions, you should contact us to inspect the outlet intake and check to see if gage zero is at the
intake. Also, it would also be an excellent opportunity to inspect the interior of the portion of the
outlet upstream of the valve. You should engage a company that videos outlets and have this
accomplished.