2014-12-22_PERMIT FILE - M2014071

• Permit No: M2014071
• IBM Index Class Name: Permit File
• Doc Date: 12/22/2014
• Doc Name: Is It Mining
• From: Denver Water
• To: DRMS
• Email Name: MAC
• Media Type: D
• Archive: No

Michael Cunningham
December 21,2014
Page 2
existing curvature of the dam is planned.The raise will require about 850,000 cubic yards of concrete,
and the aggregate for the concrete is expected to be obtained from an onsite quarry.A potential quarry
has been identified about%mile south of the dam and is comprised of South Boulder Creek Granite, a
fine to medium grained granite which is particularly hard and resistant to erosion.The quarry is located
on both Denver Water and United States Forest Service(USFS)property within the FERC Project
Boundary,and the dam is located on Denver Water property,also within the FERC Project Boundary. All
material removed from the quarry will be used onsite and within the FERC Project Boundary for the sole
purpose of constructing the dam raise. Material will not be exported from the site.
Answers to"Is It Mining" Form
1. Legal Description—Gross Dam Raise Borrow Quarry:Section 19;Township 15, Range 71; Boulder
County; Located about 5 miles east of Pinecliff,Colorado.
2. The extraction area is located on both Denver Water and USFS property within the FERC license
boundary. Extracted material will be used to make concrete for the dam raise. The dam is
located on Denver Water property also located within the FERC license boundary.
3. The operations will primarily extract granodirite and quartz monzonite material from rock
outcroppings and/or excavated areas.
4. The material will be extracted with common drilling and blasting techniques supported by
typical construction equipment such as drilling rigs,excavators,front end loaders,and haul
trucks.
5. Extracted material will be processed into aggregate, batched into concrete and used onsite for
the dam raise construction approximately%of a mile from the extraction site. The extraction
site is located on both Denver Water and USFS property and the dam construction site is located
on Denver Water property, however, both the extraction and the dam raise construction sites
are located onsite within the FERC Project Boundary.
6. The extracted material will be processed into concrete aggregate and batched into concrete
which will be used for the dam raise construction.
7. The material will remain onsite within the FERC license boundary.
8. The proposed extraction area is approximately 20 acres.
9. The extraction excavation could reach depths of up to 400 feet.
10. The dam raise requires approximately 850,000 cubic yards of concrete. Denver Water
anticipates extracting up to 2,000,000 cubic yards(including overburden waste)to create the
required quantity of aggregate.
11. The material extraction will require the use of explosives.
12. Based on available data,the extraction excavation will not expose tributary groundwater.
13. The sole purpose of the borrow quarry is to create concrete aggregate for the onsite Gross Dam
Raise project. No compensation will be received by Denver Water in relationship to the
development of the borrow quarry.