REP06848

• Permit No: C1980005
• IBM Index Class Name: Report
• Doc Date: 6/1/1994
• Doc Name: ANNUAL HYDROLOGY REPORT REVIEW SENECA II MINE C-80-005
• From: DMG
• To: SUSAN BURGMAIER
• Permit Index Doc Type: HYDROLOGY REPORT
• Media Type: D
• Archive: No

~ III IIIIIIIIIIIIIIII •
STATE OF COLORADO
DIVISION OF MINERALS AND GEOLOGY
Deparimenl of Natural Resources
I J I J Sherman 51 , Room 21 5
Denver. Gdorado 80203
I'hunc 1)071866)567
fn%: ({OA Hl2-H 106
To: Susan Burgmaier
From: Barbara Pavlik
Date:
Re:
June 1, 1994
Annual Hydrology Report Review
Seneca II Mine (C-80-005)
~~~
DEPARTMENT OI
NATURAL
RESOURCE`
Ruy Rumor
Governor
%en Sala aar
Cacc W rve Di« ~r iw
Michael B Lung
Dnision Direrlw
I have reviewed the 1993 Annual Hydrology Report for the Seneca II
Mine. In general, the report was very well organized, clear and
concise. The following questions/concerns should, however be
addressed.
Calculated Values for Parameters
i) Page 2: The discussion on how pressure readings (in psi)
are converted to obtain hydraulic head (in feet) neglects
to explain the significance of the multiplier 2.31.
Please clarify.
2) Page 17: The third paragraph references a method for
converting sulfide values to hydrogen sulfide values in
terms of un-ionized sulfide. Please provide a copy of
the page referenced (p. 477, "Standard Methods for the
Evaluation of Water and Wastewater", APHA, 1985) or
summarize the method referenced, explaining the
significance of the multiplier, 1.06.
Groundwater puality
3) Table 12 shows that four parameters have exceeded CDOH
Agricultural Standards at various locations.
Specifically, manganese exceeded the standard in a total
of 19 samples in 11 wells; iron exceeded the standard in
four samples from three different wells; fluoride
exceeded the standard in five samples from four different
wells, and pH exceeded the standard in one sample.
Manganese exceedences were observed primarily in alluvial
wells and spoils wells. A review of baseline data for
the alluvial aquifer revealed that baseline