Exhibit E Water Elevation Profile Figure.pdf
PDF 114 KB Posted
- Attached to
- Captain Jack Mill Superfund Site O & M
- Solicitation number
- RFP FAAA 2026000184 4
- Issued by
- Denver County, Denver City, Colorado
About this file
Exhibit E Water Elevation Profile Figure
This document is a technical exhibit submitted to the State of Colorado for the Captain Jack Mill Superfund Site Operations and Maintenance contract in Ward, Colorado. The exhibit presents a water elevation profile figure dated January 3, 2025, prepared by EJL, depicting water levels recorded in October 2024 across the mine complex and surrounding infrastructure. The figure illustrates the spatial and vertical relationships between 21 monitoring locations distributed across the site, including groundwater monitoring wells (MW1-MW3), mine portals (Dew Drop Portal at 9,246 feet and Big Five Adit Portal at 8,940 feet), mine workings (Niwot #1-#3, Midway #1-#2), treatment infrastructure (PB #1 and PB #2 vaults, recirculation controls, settling ponds), and surface features (Left Hand Creek, Peak to Peak Highway, tailings pile, and limestone stockpile). Water elevation measurements from October 2024 and September 2024 are documented at specific locations, ranging from 9,099 feet to 9,113 feet above mean sea level, with particular emphasis on the recirculation system between PB #1 and DD #3 operating at 0.5 percent gradient and a 7.5 HP submersible pump. The figure includes notational references indicating hydraulic connections between Dew Drop #3, CDOT Row #2, and the New California Raise, and identifies unknown mine workings intersected by several monitoring wells.
The water elevation profile serves as a foundational technical reference for the site's hydrological baseline and treatment system design. The data provided enables contractors performing O&M services to understand existing water levels, system capacity, and the distribution of mine water throughout the site's complex geology, which ranges in elevation from approximately 8,900 feet to 9,500 feet above mean sea level. The distance measurements from portal reference points and specific water elevation data at monitored locations establish baseline conditions necessary for ongoing sampling, analysis, and optimization of the permanent and temporary water treatment operations specified in the contract statement of work.
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Text version
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WATER LEVELS – October 2024
CAPTAIN JACK MILL SUPERFUND SITE
WARD, COLORADO
Figure 2
By: EJL Date: 01/03/2025
9500'
9450'
9400'
9350'
9300'
9250'
9200'
9150'
9100'
9050'
9000'
8950'
8900'
8850'
0' 0'
EL
EV
AT
IO
N (F
EE
T
AB
O
VE
M
EA
N
S
EA
L
EV
EL
)UNKNOWN VOID(S)
NIWOT #3
NIWOT #1
NIWOT #2
MIDWAY #2
MIDWAY #1
(NOT ON
CENTER-LINE)
DEW DROP
PORTAL
9,246'
DEW DROP #2
(NOT IN
WORKINGS)
DEW DROP #3
DEW DROP #1
(NOT IN
WORKINGS)
TO NIWOT CROSSCUT
AND COLUMBIA VEIN
RECIRCULATION
PIPELINE
PEAK TO PEAK HWY
(HWY 72)
CDOT ROW #1
(NOT IN
WORKINGS)
CDOT ROW #2
NEW CALIFORNIA RAISE
MW #3
(NOT IN WORKINGS)
PB #1 VAULT
RECIRC CONTROLS
PB #2 VAULT
ERT & POWER
MW #2
(NOT IN WORKINGS)
MW #1
(NOT IN WORKINGS)
BIG FIVE ADIT PORTAL
8940'
UPPER SETTLING POND
LOWER
SETTLING POND
LEFT HAND CREEK
DISTANCE FROM PORTAL (FEET)
TAILINGS PILE
BULKHEAD (3" & 12" PIPELINES)
APPROXIMATE
LIMESTONE STOCKPILE
(~221')
EXISTING ORE PILE
UPWELLING LOCATION
976' TO ORE PILE TOE
NO DATA
AVAILABLE
NOTE:
1.) DEW DROP #3, CDOT ROW #2, AND THE NEW CALIFORNIA RAISE (NCR)
ARE HYDRAULICALLY CONNECTED.
2.) MIDWAY #2, NIWOT #1 - #3 INTERSECT UNKNOWN MINE WORKINGS.
3.) TUNNEL WIDTH IS TYPICALLY 9' - 10'.
ROW#1
9,113.23'
(mm/dd/yy)
ROW#1
9,080.66'
(mm/dd/yy)
EXAMPLE:
- LOCATION
- ELEVATION OF MINE WATER amsl
- (DATE SAMPLED)
ROW2
9,070.8'
(10/25/24)
PB1
Water Elevation
9,069.0' (10/25/2024)
BULKHEAD FLOOR @ 8,944.4'
0.5%
PB #1 7.5 HP
SUBMERSIBLE PUMP
MID2
9,070.7' (9/20/24)
RECIRCULATION SYSTEM
BETWEEN PB1 AND DD3
Total Depth 9,251.3'
Total Depth 8,966.7'
Total Depth 9,021.0'
NIW1
9,071.2'
(9/20/24)
NIW2
9,072.6' (9/20/24)
MW3
9,103.4' (9/20/24)
NIW3
DRY
(9/20/24)
DD3
9,070.8'
(10/25/24)
MID1
9,099.4'
(9/20/24)
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