2005-10-19_REVISION - M2003016

• Permit No: M2003016
• IBM Index Class Name: Revision
• Doc Date: 10/19/2005
• Doc Name: TR application ground water monitoring and mitigation plan
• From: Wright Water Engineers
• To: DMG
• Type & Sequence: TR2
• Media Type: D
• Archive: No

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WWE /
Wright Water Engineers, Inc.

2490 West 26th Ave., Suite I OOA
Denver, Colorado 8021 I
~303~ 480-1700 TEL
(303J 480-1020 FAX
Via 13rst Class Mail
September 14, 2005
Mr. Carl Mount
Colorado Division ofMinerals and Geology
1313 Sherman Street, Room 215
Denver, CO 80203
Re: Request for Technical Revision for Mine Permit #M-2003-016
SW Chambers, LLC
Dear Mr. Mount:
www.wrightwateecom
e-mail:wwe®wrightwater com
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This letter is being submitted on behalf of SW Chambers, LLC to request a technical revision (TR)
to the above-referenced mine permit for the Heit Pit. Condition 2) of the Order approving the
permit required the applicant to monitor groundwater levels for a minimum of sixteen months and
to submit a TR with a specific groundwater level "trigger" and information on measures which will
be used in the event of adverse impacts to groundwater from the operation.
The scope of this TR is based on the Order, and the conversation between Ms. Ginny Duncan of
SW Chambers, LLC and you on July 8, 2005 to clarify the scope. It is also based on the
Groundwater Evaluation for the Proposed Heit Aggregate Operation (WWE March 2003) and the
Groundwater Monitoring and Mitigation Plan for Heit Aggregate Resource Operation... (WWE
July 2003). These reports were provided to Colorado Division of Minerals and Geology (DMG)
during the mine permitting process.
INFORMATION FOR TR
Piezometer location map. Ten piezometers were installed in March 2004. See attached Figure 1
for their locations.
Piezometer monitoring data. The piezometers have been monitored from Mazch 2004 to August
2005 (18 months). The data are shown in Table 1 and summarized in Table 2.
Piezometric surface maps. Figure 2A shows the average piezometec surface during the growing
season (May through October). Figure 2B shows the non-irrigation season (1Vovember through
April) average piezometric surface. A comparison of the two fgures shows that the piezometec
surfaces are similar, but approximately 1-foot lower during the non-growing season.
Table 3 shows the monthly precipitation received over the monitoring period as compared with
average precipitation. The Greeley precipitation gage was used since this is the closest gage to the
Heit Pit. Data from this station are similar to the long-term average of other weather stations in the
area (Table 4). As shown in Table 3, precipitation was close to the long-term average for the
monitoring period (96 percent of the long-term average).
GLENWOOD SPRINGS DUWWGO
(970J 945-7755 TEL [phone] FAX (970J 259-741 I TEL ~970~ 259-8758 FAX