_REVISION - M1988112 ‎(4)‎

• Permit No: M1988112
• IBM Index Class Name: Revision
• Doc Name: MEMO-REVIEW OF BATTLE MOUNTAINS PROTOCOL DOCUMENT
• From: POSEY
• To: HUMPHRIES OEHLER PENDLETON STEVENS
• Type & Sequence: TR6
• Media Type: D
• Archive: No

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"(5) Surface water monitoring systems (RS-1, RS-2, and RS-3) should continue to
be monitored quarterly. Surface water monitoring stations (RS-4, RS-5, RS-6,
and a new station on the Rito Seco, west of the tailings area, and in the flow
path of any potential leak from the tailings area) should be sampled bi-
weekly.
"Ground water monitoring stations (D87-24, M-1, and M-11) should continue
to be monitored quarterly. Groundwater monitoring stations (M-2, M-4, M-6,
M-7, M-8, M-9 and M-10) should be examined bi-weekly, and sampled if
sufficient sample is available.
"New ground water monitoring stations down gradient of th@ tailings pond
area, as required and approved by the MLRD, shall be sampled bi-weekly."
Items (1) through (4) in this section should be amended to account lot this amended
language.
5+ Section 2 (inclusive). BMG should reconsider the proposal to rinse all sampling
equipment with tap water and provide the Division evidence that the tap water at
San Luis, which is essentially groundwater, has a chemical composition similar
enough to that of the process water and to local surface water that concentrations of
evaporated salts on the sampling equipment will not affect any of the analyses
significantly.
7 Second full paragraph. It is well known that agitation of samples containing CN", in
the presence of CO,, will cause CN" to volatalize.
Therefore, if samples are to be filtered after they have been transporUed to a lab for
analysis, a study should be conducted showing that agitation duringtrar[sportationnas
a negligible effect on cyanide concentrations. If the lab receives a Container with
sample to be analyzed for CN" that is not completely full (or nearly so), or which
bears indications of leakage during shipment, that sample shall be noted by the ]ab.
If sufficient material remains to be sampled, that particular shall be re-sampled.
8 Section 2.1.7. I believe the EPA method requires that bottles be stored "below" 4
degrees C rather than at "approximately" 4 degrees. BMG should check this figure
and respond accordingly.
13 Section 2.2.6. BMG or third-party samplers should make provisions for storing the
bailers, depth measuring devices, and other sampling equipment out mf the paths of
materials that could potentially contaminate the sampling materials.
14 Section 2.2.7. For those wells with a history of low to nil fluid production, the
presence of any fluid at all may be more important than the actual content of the
fluid or of the quality of the analysis, said quality having been affected by natural or