Exhibit E Water Elevation Profile Figure.pdf

114 KB Posted

Attached to
Captain Jack Mill Superfund Site O & M
Solicitation number
RFP FAAA 2026000184 3
Issued by
Boulder County, Denver City, Colorado

About this file

Written by GovTribe AI ·

This file is a Water Elevation Profile Figure for the Captain Jack Mill Superfund Site located in Ward, Colorado, prepared by EJL on January 3, 2025, based on water level data collected in October 2024. The document presents a cross-sectional diagram illustrating water elevations across multiple mine workings and related infrastructure at the site. Key features depicted include the Dew Drop Portal at 9,246 feet elevation, the Big Five Adit Portal at 8,940 feet elevation, and various monitoring wells (MW #1, MW #2, MW #3) and boreholes (NIWOT #1, #2, #3; Midway #1, #2; DEW DROP #1, #2, #3) positioned along a centerline extending 2,500 feet. The diagram documents water elevation measurements at specific locations, with recorded elevations ranging from 9,070 to 9,103 feet above mean sea level, collected between September 20 and October 25, 2024. The profile also identifies critical infrastructure including a recirculation pipeline system, a 7.5 HP submersible pump located at PB #1, settling ponds (upper and lower), a tailings pile, limestone stockpile, and existing ore pile, with hydraulic connections noted between certain mine workings.

The figure includes technical specifications such as tunnel widths typically measuring 9 to 10 feet, a bulkhead floor elevation of 8,944.4 feet, and a 0.5 percent gradient for the recirculation system. Notably, the diagram indicates that DEW DROP #3, CDOT ROW #2, and the New California Raise are hydraulically connected, and that MIDWAY #2 and NIWOT #1 through #3 intersect unknown mine workings. Several monitoring wells and boreholes are marked as not in active workings or not in the centerline. An upwelling location is identified 976 feet from the ore pile toe with no data available for that measurement point. Peak to Peak Highway (Highway 72) and the Colorado Department of Transportation (CDOT) right-of-way are noted as surface references, with Left Hand Creek depicted as a surface water feature adjacent to the site.

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Addendum 1 Questions and Answers.pdf PDF
Exhibit F Environmental Monitoring Locations Figure.pdf PDF
Revised RFP 2026000184 Captain Jack Superfund O & M.pdf PDF
Exhibit H ContractFederalProvisions.pdf PDF
Exhibit A Submission Instructions 3.2025.pdf PDF
Revised Exhibit C Draft Statement of Work Captain Jack 4-23-2026.pdf PDF
Exhibit D Discharge Goals.pdf PDF
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Exhibit G Monitoring Locations and SeepCoordinates.pdf PDF
Exhibit B Sample Personal-Services-Contract_v 08.2025.pdf PDF
Attachment 1 Vendor Information-Confirmation of Offer Form.docx DOCX document
Attachment 2 Cost Sheets.docx DOCX document
CJM Data_Aug 2025.xlsx XLSX spreadsheet
RFP 2026000184 Captain Jack Superfund O & M.pdf PDF
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8 7 6 5 4 3 2 1

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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)

File details come from the government source that posted it. Updated .