HYDRO25324

• Permit No: M1988112
• IBM Index Class Name: Hydrology
• Doc Date: 12/22/2000
• Doc Name: MEMO NOTICE OF ISSUANCE OF THE PERMIT FOR BATTLE MTN GOLD CO-0045675
• From: CDPHE
• To: ATTENDEES AT THE PUBLIC MEETING ON THE BATTLE MTN PERMIT CO-0045675
• Media Type: D
• Archive: No

Pape 2
COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division
Rationale -Page 28 Permit No. CO-0045675
in the vicinity ojthe Rest Pi( in the area of the hismric seeps.
CJ Groundwater table elevations shall be measured and determined on a daily basis from dte West Pit, from bacdfil(
groundwater monitoring wells BF-4 and BF-S and jrom the Rito Seco alluvia! groundwater monitoring wells
M-l6 and M-10, beginning within 14 hours ajer the initial determination of e%vated groundwater levels in the
West Pit backfil! or a determination from fhe quarterly groundwater polentiometric surface map of
groundwater flow.
DJ If the second round of groundwater table measurements, and/or associated groundwater potentiomelr~c surface
map, confirms rtes! the direction ojgroundwater flow is toward fhe Rita Seto alluvium jrom the West Pit, fhe
permittee is required to increase the rate ojgroundwater pumping from the West Pit up to a maximum pumping
rate of 400 gpm within 14 hours of the determirtatian of groundwater flon• direction. The increased rate of
bac~ll groundwater pumping will continue for a period oj7 calendar days.
mpliance Schedules. (Cont.)
EJ Ij the hydraulic gradient u reversed within the 7-day period, as determined by development oja graurrdwater
potentiometric surface map using groundwater level data collected at the end of the 7-day period jrom the
groundwater monitoring wells identified in Section A.S(!J, the normal water level monitoring program, as set
forth in Paragraph (!J above, will resume. lJrhe hydraulic gradient has not been reversed within the 7-day
penod, the permittee shall submit to the WQCD, within 30 days ojthe end ojthis 7-0ay period, a response plan
that sets forth the measures to be taken to reestablish the reversal ojthe groundwater flow toward the West Pit
and a schedulejor its implementation.
FJ iYithin 3 calendar days of completing the groundwater level measurements described in Paragraph (3J(aJ above,
the permittee steal! also: (iJ conduct a visual seep inspection in the area ojhistorica! surface seepage, as shown
in Figure 1, (iiJ confirm that the steady-state groundwater table elevation in the downgradient Rito Seco
alluvial extraction wells (M-32 and M-33J is equal to or below 8540 jr amsl, and (iii) collect a water quality
sample jrom RS-1 to confirm that wafer quality standards are being met in the Rito Seco. The results of these
measurements or observations shall be transmitted in a report to N'QCD within l4 days ojcampleting al! ojtlte
measurements and observations. A separate compliance schedule activity, may be required under Sections
A.S(SJ, A.S(bJ, and A.S(]J if any of these inspections or measurements indicate conditions of the groundwater
system that are not consistent with the terms and limitations set forth in this permit.
/mplementation of the response plan mast be performed in accordance with a schedule approved by the WQCD.
Additionally, the WQCD may reopen the COPS permit to consider additional pit or alluvial groundwater
measurement requirements, based upon the results obtained jrom implementation of the response plan, if
necessary Io assure maintenance ojthe hydraulic gradient reversal.
2) Compliance Schedule for Historic Seep Area:
The historical seeps were caused by the seepage front flow and mav, in the future, also be caused by natural variation
in the Jlaw ojgroundwater in the vicinity of the histonca! seeps. The permittee steal! conduct a monthly visual
inspection oJthe histonca! seeps, and the permittee shall report any seepage flow that is associated with the area of
Historic seepage expression, as u identified in figure 1 ojthe permit.
If these inspections ident~ the occurrence of seeps, the permittee will be required to communicate verbal/y to the
WQCD within 14 Fours of the seepage observation, followed by written notification within 7 calendar days of the
seepage observation. Verbs! updates will then be provided to the WQCD every second day thereafter until a
determination has been made regarding the status aj the West Pit groundwater contra! rystem through the
implementation of the following compliance schedule.
AJ fn the event surface flow at the seep(s) is observed, groundwater level measurements will be taken, by the end ajthe
following calendar day jrom the date of the first observation ojseepage, jrom groundwater monitoring wells:
BF-3, BF-4, BF-S, BF-6, M-llR. M-!6, M-l7, M-!R. M-/9, M-10. M-1 /, M-11, M-13, M-14. M-15, M-26, M-