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2017-06-26_HYDROLOGY - M1980244
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2017-06-26_HYDROLOGY - M1980244
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Entry Properties
Last modified
12/27/2020 1:25:58 AM
Creation date
6/28/2017 10:03:40 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1980244
IBM Index Class Name
Hydrology
Doc Date
6/26/2017
Doc Name
Demonstration of Compliance with WQCC Regulation No 41
From
Newmont
To
DRMS
Email Name
TC1
Media Type
D
Archive
No
Tags
DRMS Re-OCR
Description:
Signifies Re-OCR Process Performed
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12 -T- ----- ------------------------.----_.---__.------ --- <br /> I <br /> I <br /> I <br /> 11 <br /> TL <br /> 9 -- ------- __---- --- <br /> 8 - <br /> 7 - - - <br /> 6 <br /> $i Si '8 8 8 8 25 8 g 2S o 0 0 0 0 0 0 0 <br /> ` %RE 0 0 0 0 <br /> -.-GVMW 228-30 -GVMW 22A.70 -t--GVMW BA-250 -GVMW 88-50 <br /> Figure 21: Field pH data for Grassy Valley monitoring wells. <br /> 6. Discussion <br /> The six drainages that are the subject of this report fall into two categories: drainages with groundwater <br /> that exceeds the domestic well standard for one or more constituents, and drainages in which the <br /> groundwater does not exceed the domestic well standards. It is unfortunate that no solid baseline <br /> groundwater chemistry data exist prior to modern surface mining in the district. In lieu of baseline data, <br /> the current groundwater chemistry data have been evaluated from the perspective of historic and modern <br /> mining/milling activity in each of the drainages. The results of this evaluation suggest that the <br /> exceedances in Arequa Gulch, Vindicator Valley, and Poverty Gulch are the result of historic mining <br /> activity. Impacted groundwater in Squaw Gulch appears to result from pre-drainage tunnel groundwater <br /> discharge from the diatreme, with additional impacts resulting from historic mining in the gulch. <br /> In addition to the historical evaluation, whole rock geochemistry data were obtained from Poverty Gulch <br /> (mainly the west side of Globe Hill), Arequa Gulch (Cresson area), and Vindicator Valley (southeast <br /> portion of the Vindicator Mine area, near the Lillie mine). Geometric means of the whole rock data were <br /> obtained after converting inclined borehole sample depths to true vertical depth, based on the drill hole <br /> deviation surveys, and only those data at depths from surface to the deepest compliance monitoring well <br /> in each drainage were used. Table 6 presents the geometric mean concentration for manganese and <br /> zinc in the compliance monitoring wells, the shallow whole rock data, and the ratio of the groundwater to <br /> whole rock concentrations. <br /> Table 6: Comparison of geometric mean whole rock and groundwater chemistry(values in mg/L). <br /> Whole Rock Groundwater Water:rock <br /> Drainage Mn Zn Mn Zn Mn Zn <br /> Poverty Gulch 495 240 13.5 1.3 0.027 0.005 <br /> Arequa Gulch 2065 139 1.4 0.07 0.001 0.001 <br /> Vindicator Valley- 1176 170 1.2 0.08 0.001 0.0005 <br /> Even though Poverty Gulch groundwater has the highest zinc and second highest manganese <br /> concentrations of the six drainages, whole rock manganese is anomalously low, while whole rock zinc is <br />
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