2015-09-21_GENERAL DOCUMENTS - C1981014 ‎(2)‎

• Permit No: C1981014
• IBM Index Class Name: General Documents
• Doc Date: 9/21/2015
• Doc Name: Email from W.D Corley
• From: Doug Corley
• To: DRMS
• Permit Index Doc Type: Public Correspondence
• Email Name: RDZ
• Email Name: JRS
• Media Type: D
• Archive: No

9/22/2015
State.co.us Executive Branch Mad - Re: EFCI bond release objection
STATE OF
COLORADO
Re: EFCI bond release objection
1 message
Hernandez - DNR, Alysha <[e-mail]>
Zuber - DNR, Rob <[e-mail]> Mon, Sep 21, 2015 at 11:30 AM
To: Doug <[e-mail]>, Alysha Hernandez - DNR <[e-mail]>
Thank you, Sir. That gives me a better understanding of your concern.
I cannot answer the question on the soil seed bank. Let me know if you want me to consult with vegetation
specialists here at the Division.
Regards,
Rob
Rob Zuber, P.E.
Environmental Protection Specialist II
Coal Regulatory Program
COLORADO
1 Division of Reclamation,
I Mining and Safety
Department of Natwal Resoui�es
P 303.866.3567, extension 8113 1 F 303.832.8106
1313 Sherman Street, Room 215, Denver, CO 80203
[e-mail] I http://mining.state.co.us
On Mon, Sep 21, 2015 at 9:33 AM, Doug <[e-mail]> wrote:
Rob,
It is reported on noxious weed information sites that a single knappweed plant is a serious problem, but I am
unaware of additional plants being found recently. I have not seen any EFCI veg survey reports. However,
there had to be a source for the plants that were found in the portal area. Can knappweed seed survive for
extended periods in the soil seed bank? I have no ability to key out the variety.
Mullein is categorized as a class C noxious weed in Colorado, and it has increased in numbers in the portal
area and the subsidence mitigation areas in the past two years. My point is that the mullein invasion is not
static but that it is increasing. I do not recall any documentation of any control efforts in the past.
Doug
On Sep 21, 2015, at 9:06 AM, Zuber- DNR, Rob <[e-mail]> wrote:
Dr. Corley -
I would like a clarification. You write in your letter:
"Adequate knapweed control has been mentioned multiple times in DRMS inspection
reports, but the Verbasum thapsus invasion has worsened."
Are you only concerned at this time about Mullein, or, in your opinion, is there a current issue
with Knapweed at Southfield also? I think you are saying it is not a problem, but I want to be
certain.
If you do think there is an issue with Knapweed, what variety?
hUps://mail.google.com/mail/u/0/?ui=2&ik=e29129fcb5&view=pt&search=inbox&th=14ffOf4bff92651e&sim l=14ff0f4bff92651e 1/2