2011-02-23_PERMIT FILE - P2010026

• Permit No: P2010026
• IBM Index Class Name: PERMIT FILE
• Doc Date: 2/23/2011
• Doc Name: NOI-notice of deeficiency
• From: DRMS
• To: Shell Exploration & Production Company
• Email Name: THM
• Media Type: D
• Archive: No

STATE OF COLORADO
DIVISION OF RECLAMATION, MINING AND SAFETY
Department of Natural Resources
1313 Sherman St., Room 215
Denver, Colorado 80203 C O L O R A D O

Phone: [phone] D I V I S I O N O F
RECLAMATION
FAX: [phone] MINING

SAFETY
John W Hickenlooper
DATE: 22 February 2011 Governor
Mike King
Executive Director
TO: Travis Marshall
Loretta E. PiAeda
FROM: David Bird Director
RE: Geochemistry Review. Shell Frontier Oil and Gas Multi-Mineral RDD Lease Notice of Intent,
P-2010-026
The following comments are provided in response to the Applicant's NOI received by DRMS on 30
December 2010.
1) Section 5.2.1 pg 17: Regarding the statement that major surface water divides coincide generally with
ground water divides, please provide hydrologic data to support this statement.
2) Section 5.3.1 pg 18: Regarding the statement, "Ground water flow is not influenced by topography...",
This statement seems to conflict with the statement above from page 17. Please clarify.
3) Section 5.3.2. pg 19: Please provide explanation of the temperature and density corrections that are
applied to the potentiometric ground water levels of Figures 17 through 22.
4) Section 5.4.1 discusses iron sulfide dissolution in shallow Uinta ground water and shallow Parachute
Creek Member ground water. Is there knowledge of the redox potential in all units of interest, and of redox
potential gradients and how did this knowledge affect the prediction of sulfide dissolution?
5) I am unable to locate on any map the well cluster 138-4-298. Please indicate where in the application
package this information may be found; otherwise, please show the location of this well cluster on a map so
that we can verify its position as a satisfactory compliance point.
6) Alternate Numeric Protection Levels are proposed without a rationale, other than the "2 standard
deviations" presented in the lower half of Table 5.2. Please provide the rationale behind the Alternate
Numeric Protection Levels, and also please add a column to Table 5.2 showing the number of samples (n)
upon which the statistical analyses are based.
7) Section 6.2.2 pg 30: What is the temperature of the hot water delivered versus the ambient ground water
temperature?
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Mined Land Reclamation Denver • Grand Junction • Durango Active and Inactive mines