|
Response: Requested data:
<br />'Feed statistics do not precisely match combined sump statistics due to differences in active pumping periods, variabi ity in
<br />pumping rates, differences in sampling methodology, and propegated uncertainty in totalizer measurements
<br />' As of 9/18/11
<br />3 AS of 9/16/11
<br />5) Request: Timeline of events related to Sump #10, including the date of pond backfill, the
<br />date that the elevated levels of uranium were discovered, the date that Sump #10 was
<br />installed, and all subsequent monitoring dates and data for Sump #10.
<br />Response: The pond was backfilled on June 16 -18, 2011. A spare 48 -inch diameter
<br />corrugated HDPE pipe was concurrently placed at the east end of the pond in order to
<br />continue monitoring of groundwater levels and water quality in this area of the site. The first
<br />indication of unexpectedly elevated uranium levels at this location was from a uranium
<br />screening analysis for a sample collected on June 22, 2011. After this result became
<br />available (on June 28, 2011), a confirmation uranium screening sample was collected on June
<br />28, 2011. Analytical results were received on June 30, 2011. The first official "full
<br />analytical suite" sampling of groundwater from this new monitoring location was collected
<br />and sent to Energy Laboratories on June 29, 2011. Analytical results were received from
<br />Energy Laboratories on August 4, 2011.
<br />Based on initial screening results for uranium concentrations at this new monitoring location
<br />(on the order of 13 mg/L), a spare pump was installed in the well, spare 2 -inch HDPE piping
<br />was constructed on the ground surface to convey pumped groundwater to the water treatment
<br />plant, and electrical infrastructure was concurrently constructed above ground to the nearest
<br />electrical junction box (near the haul road). This temporary pumping system became
<br />operational late in the day on July 1, 2011. Since pumping was initiated at this location,
<br />routine screening for uranium has been conducted on nearly a daily basis. Sump 10 will be
<br />converted into an official, permanently winterized sump in October 2011. Bonding for this
<br />winterization will be posted with DRMS prior to construction.
<br />6) Request: A teclmical assessment as to the probable source of the elevated uranium in the
<br />area of Sump 10.
<br />Response: See the attached report "Technical Assessment as to the Probable Source of
<br />Uranium in Sump No. 10, Schwartzwalder Mine, Jefferson County, Colorado", October 10,
<br />5
<br />Sump 1
<br />Sump 4
<br />Sump 5
<br />Sump 8
<br />Sump 9
<br />MW 9
<br />Sump 10
<br />Treatment
<br />System
<br />Feed
<br />Date Consistent Pumping Initiated
<br />7/2/10
<br />8/16/10
<br />11/11/10
<br />9/28/11
<br />11/17/10
<br />8/19/10
<br />7/2/11
<br />7/2/10
<br />Average Pumping Rate (gpm)
<br />16.5
<br />55.4
<br />31.6
<br />1.6
<br />70.1
<br />28.8
<br />22.0
<br />130.9
<br />Current Pumping Rate (gpm)
<br />11.8
<br />52.8
<br />17.4
<br />-
<br />63.2
<br />12.5
<br />14.6
<br />172.2
<br />Average Uranium Concentration (mg/14
<br />3.1
<br />2.4
<br />2.1
<br />1.1
<br />0.3
<br />2.8
<br />11.2
<br />2.5
<br />Average Uranium Removed (lbs/day)
<br />0.61
<br />1.26
<br />0.88
<br />0.02
<br />0.25
<br />0.90
<br />2.78
<br />3.49
<br />Total Uranium Removed (Ibs)
<br />230
<br />288
<br />224
<br />0.4
<br />49
<br />324
<br />200
<br />1440
<br />Response: Requested data:
<br />'Feed statistics do not precisely match combined sump statistics due to differences in active pumping periods, variabi ity in
<br />pumping rates, differences in sampling methodology, and propegated uncertainty in totalizer measurements
<br />' As of 9/18/11
<br />3 AS of 9/16/11
<br />5) Request: Timeline of events related to Sump #10, including the date of pond backfill, the
<br />date that the elevated levels of uranium were discovered, the date that Sump #10 was
<br />installed, and all subsequent monitoring dates and data for Sump #10.
<br />Response: The pond was backfilled on June 16 -18, 2011. A spare 48 -inch diameter
<br />corrugated HDPE pipe was concurrently placed at the east end of the pond in order to
<br />continue monitoring of groundwater levels and water quality in this area of the site. The first
<br />indication of unexpectedly elevated uranium levels at this location was from a uranium
<br />screening analysis for a sample collected on June 22, 2011. After this result became
<br />available (on June 28, 2011), a confirmation uranium screening sample was collected on June
<br />28, 2011. Analytical results were received on June 30, 2011. The first official "full
<br />analytical suite" sampling of groundwater from this new monitoring location was collected
<br />and sent to Energy Laboratories on June 29, 2011. Analytical results were received from
<br />Energy Laboratories on August 4, 2011.
<br />Based on initial screening results for uranium concentrations at this new monitoring location
<br />(on the order of 13 mg/L), a spare pump was installed in the well, spare 2 -inch HDPE piping
<br />was constructed on the ground surface to convey pumped groundwater to the water treatment
<br />plant, and electrical infrastructure was concurrently constructed above ground to the nearest
<br />electrical junction box (near the haul road). This temporary pumping system became
<br />operational late in the day on July 1, 2011. Since pumping was initiated at this location,
<br />routine screening for uranium has been conducted on nearly a daily basis. Sump 10 will be
<br />converted into an official, permanently winterized sump in October 2011. Bonding for this
<br />winterization will be posted with DRMS prior to construction.
<br />6) Request: A teclmical assessment as to the probable source of the elevated uranium in the
<br />area of Sump 10.
<br />Response: See the attached report "Technical Assessment as to the Probable Source of
<br />Uranium in Sump No. 10, Schwartzwalder Mine, Jefferson County, Colorado", October 10,
<br />5
<br />
|