DERR-2024-007734

APPENDIX D
BASELINE GROUNDWATER CHEMISTRY AND
WATER LEVEL STUDY MONITORING REPORT
SECOND QUARTER 2002

Prepared by:
Kennecott Strategic Resources Group
November 18, 2002
ii
TABLE OF CONTENTS

EXECUTIVE SUMMARY .............................................................................................iv
1.0 INTRODUCTION....................................................................................................... 1
1.1 Purpose.......................................................................................................................... 1
2.0 DATA COLLECTION PROCEDURES................................................................... 2
2.1 Methods......................................................................................................................... 2
2.2 Data management.......................................................................................................... 2
2.3 Quality Control/Quality Assurance............................................................................... 2
3.0 MONITORING PLAN............................................................................................... 3
3.1 Water levels .................................................................................................................. 3
3.1.1 Frequency............................................................................................................ 3
3.1.2 Monitoring Locations.......................................................................................... 3
3.2 Water Chemistry......................................................................................................... 12
3.2.1 Water Chemistry Analytical Suite..................................................................... 12
3.2.2 Sampling frequency........................................................................................... 15
3.2.3 Monitoring Locations........................................................................................ 15
4.0 WATER-TABLE LEVELS AND WATER-LEVEL CHANGES........................ 23
4.1 Water Table................................................................................................................. 23
4.2 Water-Table Changes.................................................................................................. 23
4.3 Pumping Wells........................................................................................................... 23
4.4 Vertical Gradients....................................................................................................... 24
5.0 WATER CHEMISTRY............................................................................................ 25
5.1 Data Validation........................................................................................................... 25
5.2 Acid Plume.................................................................................................................. 32
5.3 Sulfate Plume..............................................................................................................33
5.4 Acid and Sulfate Plume Migration ............................................................................. 33
6.0 SUMMARY/CONCLUSIONS................................................................................. 34
7.0 REFERENCES......................................................................................................... 44

iii

List of Tables

Table 1: Baseline Groundwater Study Water Level Monitoring Data 3
Table 2: Baseline Groundwater Study Water Samples Analytical Suite 13
Table 3: Baseline Groundwater Study Monitor Wells, Sampling Rationale, Location
and Screen Interval 16
Table 4: Baseline Groundwater Study Total Metals and Field Analytical Data 36
Table 5: Baseline Groundwater Study Dissolved Metals Analytical Data 40

List of Figures

Figure 1: September 2001 Potentiometric Surface 45
Figure 2: April 2002 Potentiometric Surface 46
Figure 3: Potentiometric Change Map 5/01 to 4/02 47
Figure 4: Vertical Gradients Observed in Nested Wells September 2001 48
Figure 5: Lowest pH at Any Depth 2001 49
Figure 6: Highest Sulfate Concentration at Any Depth 2001 50
Figure 7: Cross-Section A-A’ and April 2002 Water Table 51
Figure 8: Change in pH Contours from 1996 to 2002 52
Figure 9: Change in Sulfate Contours from 1996 to 2002 53

List of Graphs

Graph 1: ECG1117B Ca 27
Graph 2: ECG1115C K 28
Graph 3: P244C Ca 29
Graph 4: ECG1145A As 30
Graph 5: ECG904 SO4 31

iv
EXECUTIVE SUMMARY

The Baseline Groundwater Study has produced sufficient water level and chemistry data
to adequately describe the present chemical and hydrological conditions of the sulfate and
acid plumes.

Spring and fall water level measurements have documented the effects of production well
pumping. Kennecott and West Jordan production wells have resulted in approximately
an overall five feet drop in the water table over a one year time period. Drops of up to 28
feet in the local vicinity of the Kennecott acid and drinking water wells have been
documented. Recent dry conditions account for 0 to 2 feet of this overall five feet drop.

There are four zones of vertical water movement defined by the water level monitoring of
nested wells: upward gradient, downward gradient, little to no vertical gradient
(horizontal), and variable gradient. These zones are located as follows:

• Downward gradient: Located to the east and south of the process water wells and
extends from 118th South to the Old Bingham Highway.
• Upward gradient: Located in the area of the acid extraction well and extends
northeast to the Kennecott production wells.
• No vertical gradient: Located north of the Old Bingham Highway and extends
from Highway 111 east approximately 10,000 feet.
• Variable gradient: Located near the intersection of Highway 111 and 118th South
and extends 10,000 feet to the east and approximately 3000 feet north.

Water analytical data quality were evaluated and were found to meet data quality
objectives for 99.7% of the analyses performed. Only thirteen of the total 4128 separate
analyses were flagged and future analyses for these sites will be monitored to confirm
data quality.

The present day acid plume is slightly larger in plan view than the 1996 acid plume. The
areas of plume expansion are located at the northeast, southeast and south-central edges
of the plume. One area on the north-central edge of the plume has contracted, based on a
slight rise in the pH of one well.

The present day sulfate plume is smaller in plan view than the 1996 sulfate plume. The
leading eastern edge of the 1500 mg/l plume has receded approximately 1000 feet to the
west. In addition, sulfate concentrations in the >20,000 mg/l core of the plume have
decreased significantly. However, although the leading eastern edge of the 1500 mg/l
sulfate contour is receding, wells in this area that are screened below the more
concentrated and shallower sulfate zone, are showing an increase in sulfate. This may be
due to a downward vertical gradient at this location.

Differences in the expansion/contraction of the sulfate and acid plumes were evaluated
and were determined to be driven by independent processes. Shrinkage of the sulfate
plume and acid plume expansion should continue. Additional pumping from a
v
strategically placed acid extraction well appears to be the only remedial alternative to
prevent further migration of the acid plume.

The existing monitoring program is considered adequate, however if future analytical
data shows unexpected results, additional sampling of selected wells may be initiated.

1
BASELINE GROUNDWATER CHEMISTRY AND
WATER LEVEL STUDY MONITORING REPORT
SECOND QUARTER 2002

1.0 INTRODUCTION

Kennecott Utah Copper (KUC) has conducted a baseline groundwater chemistry and
water level study as part of the Remedial Design for the CERCLA groundwater plume
located in the southwest Jordan Valley. The purposes of the study were to create a current
representation of the shape and size of the groundwater plume and to monitor water level
changes. Future chemistry and water level data will be compared to the baseline data to
evaluate the effectiveness of the remediation effort and its effect on water levels. This
report presents the Baseline Study data as of the second quarter 2002.

The baseline chemistry data were collected from monitoring wells between January and
November 2001. Baseline water-level measurements were taken at three separate times:
May 2001, September 2001 and April 2002. These data have been compiled and are
presented in this report.

1.1 Purpose

Data gathered in the baseline study will be used for the following purposes:

1. To create a current, pre-remediation representation of the shape and size of the
contaminated groundwater plume and to determine the status of water level changes
in the valley. This data set will be the “starting point” against which the impacts of
remedial extraction and natural attenuation will be measured.

2. To demonstrate compliance with the stipulations of the Record of Decision for
Kennecott South Zone Ground Water Plumes (ROD) (EPA and UDEQ, 2000), that
groundwater with greater than 1500 mg/L sulfate and/or metals concentrations
exceeding state and federal drinking water standards does not migrate off KUCC
property.

3. To update the historical data set of water-level and chemical trends. Some wells in the
valley currently show falling water levels, reduced head pressure or contaminant
migration. Remediation may exacerbate the head loss. It will be necessary to
distinguish trends that existed before remediation from those caused by remedial
extraction so that KUCC can mitigate as necessary.

4. To update the current groundwater flow and transport models, including use in
calibration of a new “subset model” of the Bingham Reservoir plume area as
described in Groundwater Modeling Studies Work Plan (KUCC work in progress A).
Baseline data will be used to understand where the current model deviates from field
2
conditions, thereby allowing an initial sensitivity analysis. Areas that are closely
simulated by the model can have less frequent monitoring in the long-term
monitoring plan, and areas that are poorly predicted should be monitored on a more
frequent basis.

2.0 DATA COLLECTION PROCEDURES

2.1 Methods

KUCC’s Groundwater Monitoring and Characterization Plan (GCMP) (KUCC 2000) and
associated Standard Operating Procedures (SOPs) (KUCC 1999a) were followed for all
sampling and water level measurements. The GCMP has been approved by the Division
of Water Quality and is updated on an annual basis. Procedures for documentation and
sample handling, equipment maintenance and decontamination, quality control sampling,
field measurements, and groundwater sampling are detailed in the SOPs.

2.2 Data management

The GCMP specifies how field and laboratory data are managed from the point of
collection, through sampling and laboratory handling, to reporting in quarterly and annual
reports to the State of Utah Division of Water Quality. In addition to GCMP data
management, the Data and Records Management Plan for the Remedial Design (KUCC
work in progress B) provides more detail on how data will be managed on the project
level and how it will be managed after all GCMP procedures are complete.

All water-level data were collected using GCMP water-level measurement protocol, and
these data were entered into a project database instead of the GCMP database; therefore,
they will not be included in GCMP quarterly and annual reports. The data have been
reviewed by project personnel in a similar manner to the quality control review
conducted under the GCMP program. The two data sets have been combined to generate
the necessary tables and figures for this Baseline Study report.

2.3 Quality Control/Quality Assurance

Quality-control procedures for the GCMP program were followed for all Baseline Study
data collection. These procedures are documented in the Quality Assurance Project Plan
for the Groundwater Characterization and Monitoring Plan (QAPP) (KUCC 1999b). In
addition to the extensive quality control/quality assurance performed according to
laboratory and GCMP protocol, project personnel have reviewed the baseline data by
comparison to historical data (Section 5.1)

3

3.0 MONITORING PLAN

3.1 Water levels

3.1.1 Frequency

For the Baseline Study, three sets of water levels were collected. The first set was
collected between May 23, 2001 and May 29, 2001, the second set was collected
between September 24, 2001 and October 5, 2001 and the third set was collected
between April 4, 2002 and April 11, 2002. The April/May measurements were taken
before seasonal pumping of production wells began. The September measurements show
water levels at the end of the irrigation season but while large production wells in
surrounding communities were still pumping.

3.1.2 Monitoring Locations

Water levels measured during the September 2001 were collected from 318 wells. This
includes almost every KUCC monitoring well and some private wells in Zone A. The
water level measurements taken in May 2001 and April 2002 were collected from all the
wells with shallow (first water) completions (approximately 180 wells) and from 36 wells
with deeper screen intervals. Elevations listed have been corrected for density (Section
4.4) Table 1 lists the wells, measurement dates and water elevations in feet above mean
sea level and the change in water level from May 2001 to April 2002.

Table 1: Baseline Groundwater Study Water Level Monitoring Data (elevation in
feet above mean sea level)

Well ID April/May
2001
September
2001
April 2002 Difference
April/May
2001 to April
2002
ABC01 NM 5249.85 5248.62 NA
ABC02 5157.1 5157.33 5152.70 -4.40
ABC04 NM 5148.93 NM NA
ABC04A NM 5155.78 5154.09 NA
ABC05 4713.69 4712.07 4709.72 -3.97
ABC06 5040.08 5000.19 5014.39 -25.69
ABC07 NM 5252.13 5251.51 NA
B1G1120A 4815.72 4815.65 4812.53 -3.19
B1G1120B NM 4818.19 NM NA
B1G1120C NM 4820.10 NM NA
B1G951 5177.03 5175.98 5175.77 -1.26
B2G1157A 4601.03 4593.52 4595.75 -5.28
B2G1157B NM 4588.45 NM NA
B2G1157C NM 4588.00 NM NA
4
Table 1: Baseline Groundwater Study Water Level Monitoring Data (elevation in
feet above mean sea level)

Well ID April/May
2001
September
2001
April 2002 Difference
April/May
2001 to April
2002
B2G1176A NM 4709.71 4707.40 NA
B2G1176B NM 4710.47 NM NA
B2G1176C NM 4711.34 NM NA
B2G1193 NM 4571.94 NM NA
B2G1194B NM 4596.88 NM NA
B3G1197A 4611.02 4596.12 4605.08 -5.94
B3G1197B NM 4595.91 NM NA
B3G1197C NM 4595.75 NM NA
BCG1150A 5215.99 5215.22 5214.94 -1.05
BCG1150B NM 5214.64 NM NA
BCG1150C NM 5032.44 NM NA
BCG1158A 5239.8 5239.70 5239.30 -0.50
BCG1158B NM 5229.70 NM NA
BCG1158C NM 5223.50 NM NA
BFG1136A 4710.32 4708.44 4706.21 -4.11
BFG1136B NM 4708.60 NM NA
BFG1136C NM 4709.01 NM NA
BFG1155B 4599.89 4596.97 4595.65 -4.24
BFG1155C NM 4589.97 NM NA
BFG1155D NM 4592.66 NM NA
BFG1155E NM 4593.49 NM NA
BFG1155F NM 4593.79 NM NA
BFG1156A 4603.2 4594.99 4597.52 -5.68
BFG1156B NM 4594.67 NM NA
BFG1156C NM 4595.22 NM NA
BFG1156D NM 4595.19 NM NA
BFG1156E NM 4596.07 NM NA
BFG1156F NM 4596.14 NM NA
BFG1168A 4712.37 4710.62 4708.40 -3.97
BFG1168B NM 4710.89 NM NA
BFG1168C NM 4711.24 NM NA
BFG1195A 4601.82 4593.40 4596.28 -5.54
BFG1195B NM 4593.47 NM NA
BFG1198A 4712.52 4710.47 4708.03 -4.49
BFG1198B NM 4709.54 NM NA
BFG1198C NM 4710.70 NM NA
BRG286 5576.53 5575.90 5574.29 -2.24
BRG287 5351.82 5350.28 5348.26 -3.56
5
Table 1: Baseline Groundwater Study Water Level Monitoring Data (elevation in
feet above mean sea level)

Well ID April/May
2001
September
2001
April 2002 Difference
April/May
2001 to April
2002
BRG288 5351.54 5349.53 5348.66 -2.88
BRG289 5351.17 5349.16 5348.38 -2.79
BRG290 5323.59 5320.84 5318.61 -4.98
BRG291A 5532.61 5531.61 5530.23 -2.38
BRG919 5601.82 5601.77 5601.25 -0.57
BRG920 5341.12 5335.33 5335.55 -5.57
BRG921 5334.79 5332.88 5330.02 -4.77
BRG999 5333.93 5331.07 5328.62 -5.31
BSG1119A 4631.1 4627.35 4626.40 -4.70
BSG1119B NM 4630.61 NM NA
BSG1119C NM 4728.82 NM NA
BSG1125A 4716.89 4714.99 4714.21 -2.68
BSG1125B NM 4714.63 NM NA
BSG1125C NM 4714.27 NM NA
BSG1130A 4617.22 4613.65 4612.21 -5.01
BSG1130B NM 4610.18 NM NA
BSG1130C NM 4607.99 NM NA
BSG1132A 4609.97 4603.64 4604.47 -5.50
BSG1132B NM 4602.49 NM NA
BSG1132C NM 4598.61 NM NA
BSG1133A 4615.47 4611.11 4610.51 -4.96
BSG1133B NM 4611.55 NM NA
BSG1133C NM 4599.21 NM NA
BSG1135A 4618.83 4616.34 4614.08 -4.75
BSG1135B NM 4613.14 NM NA
BSG1135C NM 4606.44 NM NA
BSG1137A 4610.61 4605.65 4605.87 -4.74
BSG1137B NM 4603.49 NM NA
BSG1137C NM 4602.52 NM NA
BSG1148A 4716.23 4714.38 4712.72 -3.51
BSG1148B NM 4714.29 NM NA
BSG1148C NM 4713.82 NM NA
BSG1153A 4772.65 4772.13 4770.99 -1.66
BSG1153B NM 4731.83 4734.17 NA
BSG1153C NM 4794.03 4786.56 NA
BSG1177A 4710.98 4709.10 4706.93 -4.05
BSG1177B NM 4704.50 NM NA
BSG1177C NM 4716.01 NM NA
6
Table 1: Baseline Groundwater Study Water Level Monitoring Data (elevation in
feet above mean sea level)

Well ID April/May
2001
September
2001
April 2002 Difference
April/May
2001 to April
2002
BSG1179A 4715.57 4712.09 4710.10 -5.47
BSG1179B NM 4709.88 NM NA
BSG1179C NM 4705.10 NM NA
BSG1180A 4712.59 4710.64 4708.30 -4.29
BSG1180B NM 4704.62 NM NA
BSG1180C NM 4711.82 NM NA
BSG1196A 4712.64 4710.63 4708.27 -4.37
BSG1196B NM 4710.07 NM NA
BSG1196C NM 4711.63 NM NA
COG1175A 4831.89 4832.58 4829.96 -1.93
COG1175B NM 4831.32 NM NA
COG1175C NM 4832.96 NM NA
COG1178A 4834.7 4835.16 4832.71 -1.99
COG1178B NM 4835.54 NM NA
COG1178C NM 4835.56 NM NA
ECG1113A 5176.63 5175.74 5174.42 -2.21
ECG1113B NM 5145.24 5146.36 NA
ECG1113C NM 5146.08 5147.50 NA
ECG1114A 5332.81 5331.79 5330.34 -2.47
ECG1114B NM 4981.46 4981.17 NA
ECG1115A 4975.54 4964.10 4952.51 -23.03
ECG1115B NM 4978.81 4965.80 NA
ECG1115C NM 4962.22 4950.47 NA
ECG1115D NM 4988.19 4975.80 NA
ECG1115E NM 4932.59 4933.02 NA
ECG1116A 4970.11 4964.13 4951.65 -18.46
ECG1116B NM 4964.90 4953.10 NA
ECG1116C NM 5116.23 5110.81 NA
ECG1117A 4972.94 4968.11 4957.19 -15.75
ECG1117B NM 4981.14 4969.38 NA
ECG1117C NM 4988.29 4976.64 NA
ECG1118A 4807.6 4805.79 4803.78 -3.82
ECG1118B NM 4813.90 NM NA
ECG1118C NM 4816.01 NM NA
ECG1121A 4810.16 4810.13 4808.21 -1.95
ECG1121B NM 4815.09 4812.54 NA
ECG1124A 4976.44 4964.05 4951.80 -24.64
ECG1124B NM 4970.66 4954.00 NA
7
Table 1: Baseline Groundwater Study Water Level Monitoring Data (elevation in
feet above mean sea level)

Well ID April/May
2001
September
2001
April 2002 Difference
April/May
2001 to April
2002
ECG1124C NM 4985.29 4973.42 NA
ECG1128A 4973.53 4957.99 4944.98 -28.55
ECG1128B NM 4956.28 4945.48 NA
ECG1128C NM 4973.53 4959.06 NA
ECG1131A 4915.07 4913.25 4910.13 -4.94
ECG1131B NM 4929.62 4922.75 NA
ECG1131C NM 4942.52 4932.99 NA
ECG1142A 4982.95 4976.23 4962.26 -20.69
ECG1142B NM 4978.34 4976.38 NA
ECG1142C NM 4965.40 4965.94 NA
ECG1143A 5055.79 5056.66 5050.37 -5.42
ECG1143B NM 5043.19 NM NA
ECG1143C NM 5078.88 NM NA
ECG1144A 4855.67 4853.82 4851.23 -4.44
ECG1144B NM 4968.23 4955.75 NA
ECG1144C NM 4976.46 4964.29 NA
ECG1145A 4975.89 4961.33 4949.23 -26.66
ECG1145B NM 4961.36 4947.29 NA
ECG1145C NM 4971.94 4957.61 NA
ECG1146 NM 4949.56 4930.68 NA
ECG1182A 5570.11 5564.89 5569.33 -0.78
ECG1182B NM 5577.48 5576.35 NA
ECG1183A 5418.86 5418.24 5419.17 0.31
ECG1183B NM 5428.84 NM NA
ECG1184 5427.76 5406.26 5411.19 -16.57
ECG1186 5332.29 5333.89 5330.18 -2.11
ECG1187 5336 5334.94 5333.51 -2.49
ECG1188 5330.86 5330.15 5328.81 -2.05
ECG1189 5156.92 5157.06 5157.00 0.08
ECG1190 5283.58 5282.99 5282.05 -1.53
ECG1199A 5332.74 5331.72 5330.30 -2.44
ECG1199B NM 5316.86 NM NA
ECG1199C NM 5331.66 NM NA
ECG1199D NM 5331.65 NM NA
ECG1199E NM 5331.64 NM NA
ECG1199F NM 5331.85 NM NA
ECG1199G NM 5331.33 NM NA
ECG293 5262.33 5261.57 5260.64 -1.69
8
Table 1: Baseline Groundwater Study Water Level Monitoring Data (elevation in
feet above mean sea level)

Well ID April/May
2001
September
2001
April 2002 Difference
April/May
2001 to April
2002
ECG294 5286.12 5283.94 5280.77 -5.35
ECG296 5295.84 5295.14 5294.23 -1.61
ECG297 5309.33 5307.05 5305.30 -4.03
ECG299 5330.95 5329.29 5326.57 -4.38
ECG900 5331.79 5330.04 5327.29 -4.50
ECG901 5331.18 5329.90 5327.16 -4.02
ECG902 NM 5353.13 NM NA
ECG903 5487.12 5484.83 5480.56 -6.56
ECG904 5357.47 5355.80 5352.79 -4.68
ECG905 5378.71 5377.65 5374.79 -3.92
ECG906 5333.38 5332.55 5331.03 -2.35
ECG907 5334.26 5333.18 5331.54 -2.72
ECG908 5578.93 5578.00 5578.03 -0.90
ECG909 5483.66 5481.66 5479.02 -4.64
ECG916 5566.18 5564.38 5563.69 -2.49
ECG917 5354.49 5352.84 5350.61 -3.88
ECG922 5334.29 5333.49 5331.62 -2.67
ECG923 5425.88 5424.10 5420.32 -5.56
ECG924 5556.75 5556.40 5556.63 -0.12
ECG925 5521.53 5518.25 5520.66 -0.87
ECG926 5512.09 5508.33 5510.71 -1.38
ECG928 5426.2 5423.88 5419.93 -6.27
ECG931 5570.63 5569.30 5569.29 -1.34
ECG932 5633.08 5632.26 5631.56 -1.52
ECG934 5580.59 5578.82 5578.94 -1.65
ECG935 5708.8 5707.75 5707.94 -0.86
ECG936 5843.46 5842.34 5840.86 -2.60
ECG937 5806.53 5804.64 5806.63 0.10
ECG938 5983.93 5982.78 5983.60 -0.33
ECG939 5984.96 5983.30 5984.55 -0.41
ECG940 6078.47 6075.50 6079.59 1.12
ECG952 5145.13 5144.86 5142.49 -2.64
EPG1165A 4615.01 4610.80 4609.60 -5.41
EPG1165B NM 4609.11 NM NA
EPG1165C NM 4606.15 NM NA
EPG1166 4590.98 4581.78 4589.42 -1.56
EPG1689 4604.73 4605.98 4604.41 -0.32
HMG1122A 4720.22 4718.25 4717.40 -2.82
9
Table 1: Baseline Groundwater Study Water Level Monitoring Data (elevation in
feet above mean sea level)

Well ID April/May
2001
September
2001
April 2002 Difference
April/May
2001 to April
2002
HMG1122B NM 4716.59 NM NA
HMG1122C NM 4716.59 NM NA
HMG1123A 4717.34 4715.44 4715.19 -2.15
HMG1123B NM 4715.20 NM NA
HMG1123C NM 4714.94 NM NA
HMG1126A 4739.67 4735.84 4735.15 -4.52
HMG1126B NM 4735.86 NM NA
HMG1126C NM 4730.60 NM NA
HMG1134A 4622.54 4620.82 4612.40 -10.14
HMG1134B NM 4614.00 4612.66 NA
HMG1134C NM 4610.03 4609.56 NA
K105 5112.5 5112.63 5111.79 -0.71
K106 4711.99 4710.80 4708.55 -3.44
K120 5139.89 5139.69 5139.39 -0.50
K201 4621.26 4619.05 4616.34 -4.92
K26 4982.26 4973.98 4965.40 -16.86
K70 5328.44 5327.45 5326.16 -2.28
K84 5175.6 5175.24 5174.97 -0.63
LRG910 5245.72 5245.34 5244.36 -1.36
LRG911 5201.56 5201.99 5203.42 1.86
LRG912 5224.75 5223.95 5223.54 -1.21
LRG914 5259.93 5259.76 5257.61 -2.32
LTG1127A 5177.96 5176.60 5175.11 -2.85
LTG1127B NM 5183.21 NM NA
LTG1127C NM 5184.63 NM NA
LTG1129A 5032.11 5033.84 5022.08 -10.03
LTG1129B NM 5021.34 NM NA
LTG1129C NM 5018.94 NM NA
LTG1138A 4707.27 4705.40 4719.50 12.23
LTG1138B NM 4693.06 NM NA
LTG1138C NM 4699.28 NM NA
LTG1138D NM 4701.84 NM NA
LTG1138E NM 4702.75 NM NA
LTG1138F NM 4711.72 NM NA
LTG1139 NM 4952.29 5013.55 NA
LTG1140A 5039.86 5025.66 5011.49 -28.37
LTG1140B NM 5014.29 5012.95 NA
LTG1140C NM 4983.70 5016.16 NA
10
Table 1: Baseline Groundwater Study Water Level Monitoring Data (elevation in
feet above mean sea level)

Well ID April/May
2001
September
2001
April 2002 Difference
April/May
2001 to April
2002
LTG1140D NM 5068.44 5052.02 NA
LTG1147 NM 4649.36 4718.86 NA
LTG1167A 4919.5 4911.97 4907.39 -12.11
LTG1167B NM 4911.90 NM NA
LTG1167C NM 4913.85 NM NA
LTG1191 5308.45 5308.12 5308.20 -0.25
LTG929A 5210.13 5210.16 5209.60 -0.53
LTG929B NM 5207.05 NM NA
P190A 4614.55 4610.81 4609.46 -5.09
P190B NM 4609.72 4607.71 NA
P191B 4606.31 4598.63 4600.63 -5.68
P192B 4610.77 4603.99 4605.96 -4.81
P193B 4609.96 4602.75 4605.35 -4.61
P194A 4614.05 4609.84 4608.86 -5.19
P194B NM 4609.75 4608.85 NA
P197B 4593.53 4584.84 4587.82 -5.71
P208A 4971.42 4960.81 4950.33 -21.09
P208B NM 4961.85 4949.08 NA
P209B 4714.19 4712.46 4710.11 -4.08
P211A 4897.04 4896.68 4895.23 -1.81
P211B NM 4897.58 NM NA
P212A 5038.35 5032.81 5012.93 -25.42
P212B NM 5014.76 NM NA
P214A 5420.73 5419.38 5420.23 -0.50
P220 5500.09 5496.21 5492.46 -7.63
P225 5461.13 5459.31 5455.55 -5.58
P228 5762.07 5759.61 5760.78 -1.29
P231 5306.45 5305.59 5306.05 -0.40
P239 5902.87 5897.95 5900.41 -2.46
P241B 4711.85 4708.94 4708.63 -3.22
P241C NM 4716.61 4715.07 NA
P242 5185.07 5184.82 5184.90 -0.17
P243 NM 5340.53 NM NA
P244A 5629.31 5629.69 5628.95 -0.36
P244B NM 5624.83 NM NA
P244C NM 5621.42 NM NA
P248A 5253.14 5252.79 5252.27 -0.87
P248B NM 5253.69 NM NA
11
Table 1: Baseline Groundwater Study Water Level Monitoring Data (elevation in
feet above mean sea level)

Well ID April/May
2001
September
2001
April 2002 Difference
April/May
2001 to April
2002
P248C NM 5258.18 NM NA
P249A NM 4838.55 4835.64 NA
P249B NM 4838.49 NM NA
P257 4629.62 4631.35 4624.32 -5.30
P260 4599.67 4600.42 4597.69 -1.98
P261 4609.17 4609.57 4609.20 0.03
P263 4592.04 4600.88 4594.09 2.05
P264 4812.53 4812.19 4809.71 -2.82
P267B 4790.67 4783.73 4788.02 -2.65
P268 4906.54 4906.08 4904.73 -1.81
P269 NM 5036.06 5036.87 NA
P270 5396.14 5383.31 5384.74 -11.40
P271 5440.31 5438.76 5439.04 -1.27
P272 5532.14 5529.87 5529.15 -2.99
P273 4918.1 4916.77 4914.37 -3.73
P274 5083.69 5084.61 5083.51 -0.18
P277 4714.93 4712.72 4710.58 -4.35
P279 4977.33 4966.27 4954.15 -23.18
SRG945 5154.1 5153.78 5151.69 -2.41
SRG946 5171.63 5169.60 5169.84 -1.79
W131A 4645.31 4643.06 4640.37 -4.94
W361 NM 4604.33 NM NA
W403 4809.82 4802.27 4808.16 -1.66
WJG1154A 4598.02 4591.38 4599.21 1.19
WJG1154B NM 4591.39 NM NA
WJG1154C NM 4591.17 NM NA
WJG1169A 4713.09 4711.44 4709.23 -3.86
WJG1169B NM 4711.44 NM NA
WJG1169C NM 4711.56 NM NA
WJG1170A 4604.34 4592.69 4598.34 -6.00
WJG1170B NM 4592.43 NM NA
WJG1170C NM 4592.44 NM NA
WJG1171A 4607.86 4585.18 4601.82 -6.04
WJG1171B NM 4582.15 NM NA
WJG1171C NM 4581.38 NM NA
WJG1980 4604.38 4589.45 4598.79 -5.59
NM: Not measured
NA: Not applicable
12
3.2 Water Chemistry

3.2.1 Water Chemistry Analytical Suite

Ninety-six wells were chosen to be sampled for this study because of their three-
dimensional relationship to the acid and sulfate plumes. These wells were analyzed for 43
analytes (Table 2). The rationale for selecting these specific parameters is also listed in
the Table 2. The suite includes major and minor analytes as well as trace metals. Major
analytes are needed for general chemistry and to calculate charge and mass balance to
check the quality of the analyses.

Some of the analytes listed in Table 2 were identified as being present in the Bingham
Reservoir plume area at concentrations above baseline concentrations in an independent
study done as part of the RI (Shepherd Miller, Inc., 1997, page 50). Sulfate, TDS,
magnesium, cadmium, nickel and zinc were identified in the Shepherd Miller, Inc. study
as indicators of elevated concentration of metals related to mining activities. Several
elements are not indicators of the plume, according to the report, and were recommended
for removal from the list of chemicals of concern. These were barium, mercury, nitrate,
and selenium; however, because each of these elements has a primary drinking water
standard, and all but mercury are listed in the final clean-up levels in the ROD, KUCC
included these analytes in this baseline study. It is anticipated that concentrations will be
low and these elements may be dropped from the list for the long-term monitoring plan.
The study also reported that silver was not an indicator of the plume and was not found at
elevated concentrations, but was included as an analyte for the same reasons.

Chemistry data from 53 additional wells, sampled as part of the GCMP and Bingham
Canyon Mine and Leach Collection System Groundwater Discharge Permit are included
in this study. These wells were not analyzed for the full suite of 43 analytes.

Table 2 also identifies the analytical method and target detection limits for each
parameter as given in the QAPP. Analytical methods are selected by laboratory personnel
to meet the target detection limits where possible. All analyses were conducted according
to test procedures specified under Utah Administrative Code R317-6-6.3.L for
groundwater. Samples were analyzed by Kennecott Environmental Laboratory, a state-
certified lab.

13

Table 2: Baseline Groundwater Study Water Sample Analytical Suite

PARAMETER T/D RATIONAL FOR
SAMPLING
ANALYTICAL
METHOD
TARGET
DETECTION
LIMIT
FIELD
pH - general chem., has drinking
water std. E 150.1 N/A
Temperature - general chemistry E 170.1 N/A
Conductance - general chemistry E 120.1, Std
2510B
10 µmho
Depth to Water - indicator of hydraulic
changes N/A 0.01 ft
LAB.
TDS - general chemistry, plume
indicator E 160.1 10 mg/l
TSS - general chemistry E 160.2 3 mg/l
Chloride (Cl - ) T general chem., indicator of
water source E 325.2 5 mg/l
Fluoride (F- ) T has drinking water std., lack
of baseline data, may occur
at elevated levels
Std 4500F- E
C/300.0
0.2 mg/l
Sulfate (SO42-) T plume indicator E 375.2, 375.3,
9036
5 mg/l
Nitrate (NO3--N) T has drinking water standard,
to document low levels E 353.2 0. 2 mg/l
Calcium (Ca) T general chemistry E 200.7 1 mg/l
Magnesium
(Mg)
T plume indicator E 200.7 1 mg/l
Potassium (K) T general chemistry E 200.7 0.1 mg/l
Sodium (Na) T general chemistry E 200.7 1 mg/l
Alkalinity
(ALK)
- general chemistry Std 2320B, E
310.1
10 mg/l
Acidity (ACD) - general chemistry Std 2310B 10 mg/L
Aluminum (Al) TD above background
concentration, needed for
mineral acidity calculation
E 200.7, 200.8
200 µg/l
Arsenic (As) TD above background
concentration
E 200.7, 200.8,
200.9, 6010B,
6020
5 µg/l
14
Table 2: Baseline Groundwater Study Water Sample Analytical Suite

PARAMETER T/D RATIONAL FOR
SAMPLING
ANALYTICAL
METHOD
TARGET
DETECTION
LIMIT
Barium (Ba) TD to document low levels, has
drinking water standard
E 200.7, 200.8,
200.9, 6010B,
6020
10 µg/l
Cadmium (Cd) TD plume indicator E 200.7, 200.8,
200.9, 6010B,
6020
2 µg/l
Chromium (Cr) TD above background
concentration
E 200.7, 200.8,
6010B, 6020
10 µg/l
Copper (Cu) TD above background
concentration
E 200.7, 200.8,
220.1, 6010B,
6020
20 µg/l
Iron (Fe) TD plume indicator, needed for
mineral acidity calculation
E 200.7, 236.1,
6010B
300 µg/l
Lead (Pb) TD above background
concentration
E 239.1, 200.8,
200.9, 200.7,
6010B, 6020
5 µg/l
Manganese (Mn) TD plume indicator E 200.7, 243.1,
243.2, 200.8,
6010B, 6020
10 µg/l
Mercury (Hg) T to document low levels, has
drinking water standard E 245.1, 200.8 0.2 µg/l
Nickel (Ni) TD plume indicator E 200.7, 200.8,
200.9, 6010B,
6020
30 µg/l
Selenium (Se) TD to document low levels, has
drinking water standard
E 200.7, 200.8,
200.9, Mod7742,
6010B, 6020
3 µg/l
Silver (Ag) TD to document low levels, has
drinking water standard
E 272.1, 272.2,
200.8, 200.9,
200.7, 6010B,
6020
1 µg/l
Zinc (Zn) TD plume indicator E 289.1, 289.2,
200.7, 200.8,
200.9, 6010B,
6020
10 µg/l

NOTES: N/A = Not Applicable; E = EPA Method Number; Std = Standard Methods,
20th edition, method number. T/D = Total or Dissolved concentrations.
15

3.2.2 Sampling frequency

At least one sample was collected from each well included in the study between January
2001 and November 2001. Many of the wells were sampled more frequently as part of
existing monitoring programs. In these cases, the sample results closest in time to the
majority of the other Baseline Study samples were included in the Baseline Study data
set. The purpose of this was to have as many samples as possible around the same date to
provide a true “snapshot” in time.

3.2.3 Monitoring Locations

As discussed in Section 3.2.1 above, ninety-six wells were selected for water quality
sampling in the Baseline Study. Wells were selected based on (a) their three-dimensional
location in relationship to the acid and sulfate plumes and (b) their historical water-
quality trends. The name, location, screen depth and rational for sampling for each site
are given Table 3. Monitoring locations are more dense in the acid plume and the sulfate
extraction areas because these are the areas that will be critical to monitor for changes
during plume extraction. The margin of the sulfate plume between the sulfate extraction
area and West Jordan’s municipal well field also have been monitored more densely.
Other monitored areas include several wells around the Lark clean water production well
(well ID LTG1139) where supplemental water for plume treatment may be obtained, and
a line of wells along the base of the Oquirrh Mountains, where recharge to the alluvial
aquifer occurs.
16
Table 3: Baseline Groundwater Study monitor wells, sampling rationale, location and screen
interval

Well ID Sampling Rationale Northing* Easting* Screen
top (ft)
Screen
Bot (ft)
B1G1120A acid plume core 16141 26693 493 532
B1G951 source area (large reservoir) 16322 21727 92 131
B2G1176A acid plume margin 16148 30121 555 575
B2G1193 SO4 extraction 15378 33485 451 881
B3G1197A SO4 extraction, West Jordan well field 17661 38129 340 360
B3G1197B SO4 extraction, West Jordan well field 17661 38129 460 480
B3G1197C SO4 extraction, West Jordan well field 17661 38129 610 630
BFG1195A SO4 extraction 16434 33104 558 578
BFG1195B SO4 extraction 16434 33104 679 699
BFG1198A 1500 mg/L SO4 contour, property boundary 17580 30793 400 420
BRG286 Leachwater Collection System Operational Well 15036 15181 153 183
BRG287 Leachwater Collection System Operational Well 14559 16105 231 261
BRG288 Leachwater Collection System Operational Well 15418 15821 284 363
BRG289 Leachwater Collection System Operational Well 15461 16261 225 265
BRG290 Leachwater Collection System Operational Well 15045 16208 275 354
BRG291A Leachwater Collection System Operational Well 14494 15463 183 223
BRG919 Leachwater Collection System Operational Well 14263 14430 116 155
BRG920 Leachwater Collection System Operational Well 13262 15108 159 198
BRG921 Leachwater Collection System Operational Well 13190 16540 303 343
BRG999 Leachwater Collection System Operational Well 14479 17043 250 290
BSG1119B acid plume, leading edge 13853 32358 538 558
BSG1125A 1500 mg/L SO4 contour, property boundary 8494 32397 280 320
BSG1130A 1500 mg/L SO4 contour 10114 34557 340 380
BSG1133A 1500 mg/L SO4 contour 12400 34000 390 410
BSG1133B 1500 mg/L SO4 contour 12400 34000 600 620
17
Table 3: Baseline Groundwater Study monitor wells, sampling rationale, location and screen
interval

Well ID Sampling Rationale Northing* Easting* Screen
top (ft)
Screen
Bot (ft)
BSG1137A 1500 mg/L SO4 contour 15300 38000 377 397
BSG1137B 1500 mg/L SO4 contour 15300 38000 637 657
BSG1148A acid plume margin 11276 28859 510 530
BSG1148B acid plume margin 11276 28859 580 600
BSG1177A acid plume margin 13826 30357 525 545
BSG1177B acid plume margin 13826 30357 680 700
BSG1179A acid plume margin 12358 29633 440 460
BSG1179B acid plume margin 12358 29633 685 705
BSG1179C acid plume margin 12358 29633 805 825
BSG1180B acid plume, leading edge 13817 31356 660 680
BSG1180C acid plume, leading edge 13817 31356 798 818
BSG1196B acid plume, leading edge 13825 31860 470 490
BSG1196C acid plume, leading edge 13825 31860 650 670
ECG1113A clean water source area 8508 21783 138 178
ECG1115A acid plume core 14603 24663 538 578
ECG1115B acid plume core, base 14603 24663 838 858
ECG1115C acid plume core, base 14601 24700 898 938
ECG1117A acid plume core 15047 25243 438 478
ECG1117B acid plume core, base 15047 25243 758 798
ECG1118A acid plume core 13882 27446 598 638
ECG1118B acid plume core, base 13882 27446 818 858
ECG1121A acid plume core 14957 26824 600 640
ECG1128A acid plume margin 12249 25795 418 458
ECG1144A acid plume core 13855 26003 440 460
ECG1145A acid plume core 13049 25373 420 440
18
Table 3: Baseline Groundwater Study monitor wells, sampling rationale, location and screen
interval

Well ID Sampling Rationale Northing* Easting* Screen
top (ft)
Screen
Bot (ft)
ECG1145B acid plume core 13049 25373 760 780
ECG1145C acid plume core, base 13049 25373 810 830
ECG1146 acid plume core 13467 25673 500 750
ECG1183A alluvial bedrock contact 579 18992 35 65
ECG1183B Sulfate monitoring 579 18992 280 300
ECG1184 Butterfield Canyon alluvial recharge to Herriman -1538 17816 60 80
ECG1186 Leachwater Collection System Compliance Well
(alluvium near recharge area)
9647 18578 36 136
ECG1187 Leachwater Collection System Compliance Well
(alluvium near recharge area)
7540 18458 54 164
ECG1188 Leachwater Collection System Compliance Well
(alluvium near recharge area)
10109 18567 38 118
ECG1189 Leachwater Collection System Compliance Well
(alluvium near recharge area)
13054 19990 205 265
ECG1190 Leachwater Collection System Compliance Well
(alluvium near recharge area)
11715 19026 118 198
ECG294 Bingham Creek 15987 17728 165 205
ECG297 Bingham Creek 15935 17370 97 136
ECG299 Leachwater Collection System Operational Well 13807 17474 161 201
ECG900 Leachwater Collection System Operational Well 13772 17557 276 316
ECG901 Leachwater Collection System Operational Well 13734 17716 178 218
ECG902 Leachwater Collection System Operational Well 12180 17214 226 265
ECG903 Leachwater Collection System Operational Well 11385 15617 158 198
ECG904 Leachwater Collection System Operational Well 10433 17076 206 246
ECG905 Leachwater Collection System Operational Well 10839 16434 254 293
19
Table 3: Baseline Groundwater Study monitor wells, sampling rationale, location and screen
interval

Well ID Sampling Rationale Northing* Easting* Screen
top (ft)
Screen
Bot (ft)
ECG906 Leachwater Collection System Operational Well 9121 17481 159 199
ECG907 Leachwater Collection System Operational Well 7087 17875 131 171
ECG908 Leachwater Collection System Operational Well 9457 15187 207 246
ECG909 Leachwater Collection System Operational Well 12745 15271 186 226
ECG915 Leachwater Collection System Operational Well 8804 15135 138 178
ECG916 Leachwater Collection System Operational Well 9692 15269 238 277
ECG917 Leachwater Collection System Compliance Well
(alluvium near recharge area)
6289 18385 150 190
ECG922 Leachwater Collection System Operational Well
(alluvium near recharge area)
7677 18058 142 181
ECG923 Leachwater Collection System Operational Well 4934 17977 119 158
ECG924 Leachwater Collection System Compliance Well 661 16870 69 109
ECG925 Leachwater Collection System Compliance Well 1343 17470 69 109
ECG926 Leachwater Collection System Operational Well 2549 17698 165 204
ECG928 Leachwater Collection System Operational Well 5126 18358 119 158
ECG931 Leachwater Collection System Operational Well -708 16395 107 147
ECG932 Leachwater Collection System Compliance Well -2325 14914 147 187
ECG934 Leachwater Collection System Compliance Well -4704 14177 187 227
ECG935 Leachwater Collection System Compliance Well -6210 13555 89 128
ECG936 Leachwater Collection System Operational Well -6303 12389 82 122
ECG937 Leachwater Collection System Compliance Well -8174 11378 276 316
ECG938 Leachwater Collection System Compliance Well -8909 9785 242 282
ECG940 Leachwater Collection System Compliance Well -10587 7385 198 237
HMG1126A Herriman water quality 2682 31045 280 320
HMG1126B Herriman water quality 2682 31045 380 420
20
Table 3: Baseline Groundwater Study monitor wells, sampling rationale, location and screen
interval

Well ID Sampling Rationale Northing* Easting* Screen
top (ft)
Screen
Bot (ft)
HMG1134A Herriman water quality 5503 41670 160 180
HMG1515 Herriman water quality -4662 27152 104 390
HMG1623 Riverton water quality 5711 48152 134 135
HMG1856 Herriman water quality 657 33611 200 280
HMG2067 Herriman water quality -5128 27923 140 147
HMG2436 Herriman water quality -5231 27797 140 155
HMG2727 Herriman water quality -3198 26981 169 170
K109 SO4 extraction 17611 34847 403 520
K26 source area (large reservoir) 16448 25287 204 224
K72 Leachwater Collection System Operational Well
(alluvium near recharge area)
13841 18189 10 240
LRG910 source area (large reservoir) 16038 18754 77 136
LRG911 source area (large reservoir) 15231 18914 77 136
LRG912 source area (large reservoir) 16539 19577 77 136
LTG1139 clean water source area 6989 24166 330 980
LTG1140A clean water source area 6984 23149 220 240
LTG1140B clean water source area 6984 23149 330 350
LTG1147 SO4 extraction well 7067 29725 400 590
LTG1167B Herriman water quality 553 28415 300 320
LTG1191 Leachwater Collection System Compliance Well 3749 20549 20 100
P190A 1500 mg/L SO4 contour, property boundary 12580 37968 286 296
P190B 1500 mg/L SO4 contour, property boundary 12570 37976 529 539
P208B acid plume margin 12512 25036 401 412
P220 Leachwater Collection System Operational Well 10999 16234 100 120
P225 Leachwater Collection System Operational Well 12000 17200 125 165
21
Table 3: Baseline Groundwater Study monitor wells, sampling rationale, location and screen
interval

Well ID Sampling Rationale Northing* Easting* Screen
top (ft)
Screen
Bot (ft)
P228 Leachwater Collection System Operational Well -1491 13963 ? 84
P239 Leachwater Collection System Operational Well 1315 14210 90 100
P241B acid plume margin 12351 29699 530 570
P241C 1500 mg/L SO4 contour, property boundary 9804 32427 385 405
P244A alluvium near recharge area 2285 16110 37 47
P244B bedrock recharge 2278 16123 63 73
P244C bedrock recharge 2266 16139 107 127
P248A alluvium near recharge area 15485 17875 80 100
P248B bedrock recharge 15491 17849 120 140
P248C bedrock recharge 15496 17828 175 195
P272 Leachwater Collection System Operational Well 3964 16571 85 105
P279 acid plume core 14156 24053 395 415
RVG1164A Riverton water quality 1840 56073 180 200
RVG1164B Riverton water quality 1840 56073 340 360
RVG1164C Riverton water quality 1840 56073 680 710
SRG946 source area (small reservoir) 16988 21598 120 179
W107 property boundary 20440 43285 215 460
W189 property boundary 18943 39481 350 637
W22 Herriman water quality -1534 23091 80 350
W361 West Jordan well field 25805 37702 225 620
W363 West Jordan well field 23509 37928 380 590
W387 West Jordan well field 23373 35197 379 690
W409 Herriman water quality -4079 27132 140 505
W412 Herriman water quality -5469 23323 105 256
W41A mouth of butterfield creek -1401 19536 45 73
22
Table 3: Baseline Groundwater Study monitor wells, sampling rationale, location and screen
interval

Well ID Sampling Rationale Northing* Easting* Screen
top (ft)
Screen
Bot (ft)
WJG1154A SO4 extraction, West Jordan well field 20510 36367 310 350
WJG1154B SO4 extraction, West Jordan well field 20510 36367 400 420
WJG1154C SO4 extraction, West Jordan well field 20510 36367 730 750
WJG1169A 1500 mg/L SO4 contour, West Jordan well field 19501 30501 400 420
WJG1169B 1500 mg/L SO4 contour, West Jordan well field 19501 30501 470 490
WJG1170A SO4 extraction, West Jordan well field 19110 35012 375 395
WJG1171A SO4 extraction, West Jordan well field 20426 37696 430 450

*Kennecott Mine Coordinate System
23
4.0 WATER-TABLE LEVELS AND WATER-LEVEL CHANGES

Water-table elevation drawings, Figures 1 and 2, have been compiled from the September
2001 and the April 2002 monitoring events. Figure 3 shows the change in water levels
between May 2001 and April 2002.

4.1 Water Table

The water-table gradient in the southwestern Jordan Valley drops steeply from the east
side mine waste-rock dumps eastwardly, to approximately 2000 feet east of Highway 111
(Figure 7). The water table shows an abrupt flattening from there to approximately 3000
feet to the east, then steepens again to the easting of the Kennecott production wells. The
gradient is again flatter from the production wells east to the Kennecott property line.
Variations in the water table due to production well pumping are observed locally.

4.2 Water-Table Changes

Almost every well that was monitored has shown a decrease in the water level from May
2001 to April 2002. The majority of the drop in water levels in most wells is due to
effects of nearby pumping wells. There are only a few wells that have not been
influenced by pumping wells, and these have shown a drop of 0 to 2 feet. However, the
zones of influence from the West Jordan well field, Kennecott’s process water, acid,
sulfate and freshwater wells cover almost the entire study area. Only wells located to the
immediate east of the east-side mine waste rock dumps and the area north of the city of
Copperton are unaffected by pumping wells.

4.3 Pumping Wells

The acid extraction well area near ECG1146 has experienced a drop in the water table of
28 feet from May 2001 to April 2002. Drops of greater than 5 feet are seen in an area
approximately 4000 east to west and 9000 feet north to south of ECG1146.

The drinking water well LTG1139 has dropped the water table up to 28 feet in the
immediate vicinity of the well. Drops of greater than 5 feet are seen in the LTG1139 area
and cover approximately 4000 feet southwest to northeast and 7000 feet northwest to
southeast.

Water levels adjacent to LTG1147 recovered slightly from May 2001 to April 2002. This
can be observed in monitoring well LTG1138A and is due to less pumping of LTG1147
during the year.

The West Jordan well field water-level has dropped more than 5 feet in an area covering
approximately 6500 feet north to south and 5500 feet east to west. Kennecott’s
production wells BFG1200 and B2G1193 has created a drop in the water-table of greater
than 5 feet in an area covering approximately 8000 feet east to west and 10000 feet north
24
to south. The area of influence of Kennecott’s production wells probably overlaps with
that of the acid extraction well ECG1146 located 8500 feet to the west.

4.4 Vertical Gradients

Vertical gradients were determined by comparing static water levels where multiple-
completion wells are located. Most of the multiple-completion wells are located near the
acid extraction, Kennecott process water and Kennecott drinking water wells. Only a few
multiple-completion wells are located along the east-side waste-rock dumps. Most of the
multiple-completion wells have at least three wells completed at the same location with
these exceptions: one location has five completions, one location has six completions and
one location has seven completions.

The water elevations were corrected for density differences in areas where plume water
with high total dissolved solids (TDS) are found. The density correction is based on an
empirical formula for plume waters determined from laboratory measurements. The
density correction was calculated by multiplying the TDS by 0.0000008 and adding 1.
This number is then multiplied by the column of water (feet) in the well (measured from
the screen bottom to the measured depth to water). Density corrections are notable in the
deeper wells with high TDS (plume core) water.

Table 1 lists the water level measurements for three separate measuring events. The
nested wells were all measured in the September 2001 monitoring event. The vertical
gradient data discussed here are based on the September 2001 data. Figure 4 shows the
multiple-completion well locations and the vertical gradients as listed in Table 1.

There are four zones of water movement defined by the data: upward gradient, downward
gradient, little to no vertical gradient, and variable gradient. The zone where most wells
show an upward gradient is located in the area of the acid extraction wells and extends
east to the Kennecott process water wells. The zone showing a downward gradient is
located east and south of the process water wells and extends from 118th South to the Old
Bingham Highway. A smaller zone of wells showing no vertical gradient, is located north
of the Old Bingham Highway and extends from Highway 111 east approximately 10,000
feet. There is a zone where the vertical gradient is variable. Generally this area has a
downward gradient from the A completion toward the B completion. The C completion
is, more often than not, confined and has a higher static water level than the A well and
less often higher than the B completion. This variable gradient zone of wells is located
near the intersection of Highway 111 and 118th South and extends 10,000 feet to the east
and approximately 3000 feet north. These variable gradient well locations are not
exclusive to this zone and are found locally in, and around, the upward gradient zone as
shown in Figure 4.

It should be noted that the vertical gradients, defined by the September 2001 monitoring
event, are likely affected by production well pumping. Water may be preferentially pulled
25
through more conductive zones and, depending on well screen placement, show gradients
that may not exists under static conditions. In addition, the alluvial geology, particularly
near the acid well, is variable, as is the depth of screen intervals. Variations include
quartzitic gravel, volcanic gravel, quartzitic gravel with clay interbeds and volcanic tuffs
interbedded with clay. Despite these variables these four zones have been defined by the
data.

5.0 WATER CHEMISTRY

5.1 Data Validation

Baseline samples collected in 2001 were compared to the pre-existing data set for each
analyte. The purpose was to determine if the baseline data properly represents the analyte
concentration at the time the sample was collected. The baseline data point was compared
to the most recent 8 to 12 data points for each analyte. The mean and the standard
deviation of the baseline data point plus the previous 8 to 12 sample points were
calculated. Not all wells have been sampled 8 times but the same calculations were made
as long as there were at least two data points for an analyte. If the baseline data point was
greater than plus or minus two times the standard deviation, the point was flagged. One
hundred three points were flagged from the 4128 separate analyses (2.50 percent).

The analytical data for each flagged point were reviewed. All the flagged data fell into
four categories. In 65 percent of the samples, the baseline data point was the first sample
in time series collected from a well after a relatively long time (often 2 to 3 years). This
data gap, in conjunction with a pre-existing increasing or decreasing trend, resulted in the
point being flagged as an outlier when in fact it was on trend (explanation 1 and graph 1
below).

In 13 percent of the samples, the baseline data point was the first sample collected in a
relatively long time and was flagged as an outlier but, no pre-existing trend was
evidenced by previous data. This could be due to a trend that may have started some time
between the baseline sample event and the most recent sample or, the baseline data point
may in fact be a non-representative outlier (explanation 2 and graph 2 below). The next
analysis for these wells will be checked to confirm if the baseline point is the first data
point indicating a trend or, is an outlier that may be a non-representative data point.

Twenty-one percent of the data shows that the concentration of an analyte has historically
varied more than two times the standard deviation (see explanation 3). This may be due
in part to the location of the well relative to the advancing groundwater plume. For
example, some wells have shown changes in concentrations of sulfate from 12,000 to
27,000 mg/l over short periods of time as the plume advances (graph 3). These data are
reasonable given the location of the well and the known water chemistry of the plume.
Wells with concentrations of an analyte that are at or slightly above the method detection
limit can also exceed two times the standard deviation without being unreasonable data
(graph 4). Some wells have data sets with more than 25 data points that clearly show that
26
an analyte concentration varies more than two times the standard deviation and that is
representative of the water at that location (graph 5). Wells that fall into one of these
categories were assigned explanation 3.
27

Graphs

Graph 1: ECG1117B Ca

[Click on above link - Tab 1]

Graphs 1-5
28
Graph 2: ECG1115C K

[Click on above link – Tab 2]

29
Graph 3: P244C Ca

[Click on above link – Tab 3]

30
Graph 4: ECG1145A As

[Click on above link – Tab 4]

31

Graph 5: ECG904 SO4

[Click on above link – Tab 5]
32

Only one baseline data point was determined to be a non-representative outlier (B2G1193
Zn). One sample was collected after the baseline sample, and the Zn concentration of the
subsequent sample is similar to concentrations prior to the baseline sampling event. This
analysis will be omitted from the data set, and the most recent sample replaced as the
baseline data point.

In summary, only one of 4128 separate analyses (0.02 percent) is considered invalid, and
that well has been re-sampled so that a valid datum is available for the baseline. Another
13 samples (0.3%) will be confirmed in subsequent sampling rounds. 99.7 percent of the
data are confirmed. The baseline analytical data are included in Tables 4 and 5.

Number Code Explanation

1. Long time between sampling events and baseline data point is much lower or higher
than the mean concentration but consistent with a pre-existing rising or falling trend.
Data are considered valid.

2. Long time between sampling events and baseline data point is much lower or higher
than the mean concentration. A rising or falling trend may have begun between
sampling events, and baseline data point may be valid. Need to monitor next
sampling event to confirm whether there is a trend occurring or point is an outlier.

3. Historically, analytical results have varied enough to exceed two standard deviations.
This may be a result of very high or very low analyte concentrations, the location of
well relative to advancing groundwater plume or for other reasons the analyte just
varies that much. Data are considered valid but future analyses will be monitored.

4. Outliers are non-representative data and should be removed from data set.

5.2 Acid Plume

The acid plume is defined as that section of the plume with the pH less than 4.5 standard
pH units. Figure 5 shows the low (<4.5) pH distribution relative to the entire plume. This
covers an area of 5500 feet (north to south) by 12,700 feet (east to west) and is located to
the immediate east and down-gradient of the source area.

The present day acid plume is slightly larger in plan view than the 1996 acid plume
(Figure 8). The areas of plume expansion are located at the northeast, southeast and
south-central edges of the plume. The plume has expanded approximately 700 feet to the
northeast and 300 feet to the southeast. The south-central edge of the plume has
expanded to the southeast approximately 500-100 feet in an irregularly shaped area. One
area of the plume, located at the north-central edge has contracted approximately 1000
feet to the southwest, based on a slight rise in the pH of one well.

33
The pH plume defined by water with pH’s between 4.5 and 6.5 has also expanded
slightly compared to the 1996 plume. Areas of expansion are located along the southeast,
east and northeast leading edge of the plume. The plume has expanded approximately
350 feet to the northeast and east and approximately 300 feet to the southeast.

5.3 Sulfate Plume

The sulfate plume is defined as that section of the plume with sulfate concentrations
greater than 1500 mg/l sulfate. Figure 6 shows the sulfate distribution within the plume.
Sulfate in excess of 1500 mg/l is found in the main core of the plume, which covers an
area of approximately 12,000 feet north to south and 17,000 feet east to west. This core
portion is located to the immediate east and down-gradient of the former source area
(Large Bingham Creek Reservoir).

The present day sulfate plume is smaller in plan view area than the 1996 sulfate plume
(Figure 9). The leading edge of the 1500 mg/l sulfate contour line has receded to the west
approximately 1000 feet. There are minor changes at the northeast leading edge of the
plume where the 1500 mg/l contour line has receded and expanded locally. The plume
core (>5000mg/l) is approximately the same size today as in 1996 with minor variations
locally, however sulfate concentrations have dropped significantly in the >20000 mg/l
core area.

Although the leading eastern edge of the 1500 mg/l sulfate contour is receding, wells in
this area that are screened below the more concentrated shallower sulfate zone are
showing an increase in sulfate. This may be due to a downward vertical gradient at this
location.

5.4 Acid and Sulfate Plume Migration

As described above, the acid and sulfate plume monitoring has shown some changes in
the spatial extent of the plumes since monitoring has begun. The sulfate plume has
decreased in size near the eastern leading edge and the acid plume has increased in size
along the northeast, east and southeast leading edges. This disparity is addressed below.

The sulfate concentration of the plume is finite and since the source has been cut-off no
new sulfate has been added to the system. As the initial mass of sulfate moves
downgradient there are only two processes that affect sulfate concentration change. These
processes are, precipitation of the sulfate bearing phases and dispersion. Both of these
processes tend to decrease SO4 concentration in the downgradient direction. Precipitation
decreases aqueous concentration by moving SO4 from the aqueous to the solid phase.
Dispersion decreases the aqueous concentration by increasing the total volume of
solution under consideration.

The effect of dispersion is clearest near the leading edge of the plume. In the area of the
1500 mg/L SO4 contour, the advancing plume has the maximum potential to release Ca
into solution, and in the same zone, the Mg concentration (which had been maintaining
34
SO4 in solution as a complex magnesium-sulfate ion) has decreased significantly. These
effects maximize the potential for gypsum precipitation.

In contrast to sulfate, which represents a unique and finite mass of specific dissolved
molecules, the pH of the acid plume is a response of the chemical system to acid-base
reactions that are occurring in solution. Ninety to ninety-five percent of the acidity in the
acid plume is derived from the hydrolysis of Al3+ and Fe3+ ions in solution. The core of
the acid plume has dissolved Al concentrations in the range of 1500 – 2000 mg/L. As the
groundwater plume migrates down-gradient into zones with near-neutral pH water, the
dissolved Al undergoes a hydrolysis reaction that produces hydrogen ions, thereby
decreasing the pH. The zone in which this kind of reaction is most likely to occur is at the
leading edge of the plume.

The remaining five to ten percent of the acidity is a result of carbon dioxide production
from the solution of calcium carbonate encountered as the plume advances through
previously unacidified sediments. In deep groundwater, the carbon dioxide cannot leave
the system to the atmosphere and so is converted to carbonic acid or bicarbonate by
reaction with water. Elevated concentrations of these compounds will depress the pH of
the groundwater. This phenomenon may contribute to the depression of pH near the
leading edge, especially in zones where the observed pH has fallen from about pH 7 to
pH 6.

Dilution of the acid plume, through dispersion, has relatively little effect on pH because
of its logarithmic definition (versus the arithmetic definition of concentration).

Additional pumping from a strategically placed acid extraction well appears to be the
only remedial alternative to prevent further migration of the acid plume.

6.0 SUMMARY/CONCLUSIONS

The Baseline Groundwater Study has produced sufficient water level and chemistry data
to adequately describe the present chemical and hydrological conditions of the sulfate and
acid plumes.

Spring and fall water level measurements have documented the effects of production well
pumping. Kennecott and West Jordan production wells have resulted in approximately
an overall five feet drop in the water table over a one year time period. Drops of up to 28
feet in the local vicinity of the Kennecott acid and drinking water wells have been
documented. Recent dry conditions account for 0 to 2 feet of this overall five feet drop.

There are four zones of vertical water movement defined by the water level monitoring of
nested wells: upward gradient, downward gradient, little to no vertical gradient
(horizontal), and variable gradient. These zones are located as follows:

35
• Downward gradient: Located to the east and south of the process water wells and
extends from 118th South to the Old Bingham Highway.
• Upward gradient: Located in the area of the acid extraction well and extends
northeast to the Kennecott production wells.
• No vertical gradient: Located north of the Old Bingham Highway and extends
from Highway 111 east approximately 10,000 feet.
• Variable gradient: Located near the intersection of Highway 111 and 118th South
and extends 10,000 feet to the east and approximately 3000 feet north.

Water analytical data quality were evaluated and were found to meet data quality
objectives for 99.7% of the analyses performed. Only thirteen of the total 4128 separate
analyses were flagged and future analyses for these sites will be monitored to confirm
data quality.

The present day acid plume is slightly larger in plan view than the 1996 acid plume. The
areas of plume expansion are located at the northeast, southeast and south-central edges
of the plume. One area on the north-central edge of the plume has contracted based on a
slight rise in the pH of one well.

The present day sulfate plume is smaller in plan view than the 1996 sulfate plume. The
leading eastern edge of the 1500 mg/l plume has receded approximately 1000 feet to the
west. In addition, sulfate concentrations in the >20,000 mg/l core of the plume have
decreased significantly. However, although the leading eastern edge of the 1500 mg/l
sulfate contour is receding, wells in this area that are screened below the more
concentrated and shallower sulfate zone are showing an increase in sulfate. This may be
due to a downward vertical gradient at this location.

Differences in the expansion/contraction of the sulfate and acid plumes were evaluated
and were determined to be driven by independent processes. Shrinkage of the sulfate
plume and acid plume expansion should continue. Additional pumping from a
strategically placed acid extraction well appears to be the only remedial alternative to
prevent further migration of the acid plume.

The existing monitoring program is considered adequate, however if future analytical
data shows unexpected results, additional sampling of selected wells may be initiated.

36

Table 4: Baseline Groundwater Study Total Metal and Field Analytical Data

SITE ID DATE DEPTH COND PH TEMP TDS TSS CA MG NA K SO4 CL F ALK ACD NO2_N NO3_N
feet Us/cm degree
C
mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l
B1G1120A 7/20/01 315.1 10980 3.61 18 15600 4 400 2021 114 12.2 11000 200 0.3 <5.0 3490 <0.05 0.2
B1G951 9/18/01 62.79 14210 3.34 16 25500 4 388 4700 103 5.1 17700 196 0.1 <5.0 7880 <0.05 <0.2
B2G1176A 8/15/01 367.11 6490 3.9 17 7840 <3.0 460 906 120 11 4610 172 6.7 <5.0 <0.05 0.5
B2G1193 9/19/01 2820 6.98 17 2930 <3.0 558 179 84 5.3 1620 168 0.1 206 <0.05 1.3
B3G1197A 9/18/01 313.33 996 7.5 16 744 <3.0 121 43 44 3.2 230 98 0.2 150 <0.05 1
B3G1197B 9/17/01 313.34 748 7.52 16 451 <3.0 82 33 35 3.4 80 110 0.2 151 <0.05 1
B3G1197C 9/17/01 313.35 588 7.57 16 396 <3.0 62 26 31 3.2 44 71 155
BFG1195A 8/17/01 419.19 2980 7.04 16 2510 <3.0 527 145 92 4.9 1340 188 0.2 220 <0.05 1.6
BFG1195B 8/15/01 418.36 2120 7.22 17 1660 <3.0 282 81 62 3.5 641 135 0.2 187 <0.05 1.9
BFG1198A 2/28/01 366.43 2150 7.16 12 1710 <3.0 312 88 95 3.5 828 272 165
BRG286 5/17/01 93.17 954 7.42 13 620 700 117 31 49 2.2 48 164 184
BRG287 5/16/01 274.53 3450 7.11 16 2800 <3.0 510 135 131 9.8 712 671 373
BRG288 4/5/01 300.05 1078 7.07 12 664 <3.0 147 33 40 4.8 64 195 191
BRG289 4/5/01 205.94 1046 7.11 11 650 <3.0 136 35 39 4 68 180 188
BRG290 7/5/01 301.88 1620 7.02 16 1090 <3.0 192 74 30 4 129 346 161
BRG291A 5/14/01 85.05 5330 6.43 14 4670 <3.0 896 217 333 5.7 1760 596 1050
BRG919 5/14/01 41.52 3360 7.33 14 2400 25 245 234 129 8.5 265 871 142
BRG920 5/14/01 91.27 2950 6.73 13 2570 <3.0 451 151 118 4.1 1210 176 608
BRG921 7/10/01 296.09 2170 6.9 14 1680 <3.0 356 87 107 5.8 656 255 259
BRG999 7/5/01 230.49 1814 7 16 1390 <3.0 268 67 67 7.3 510 210 208
BSG1119B 8/8/01 421.91 8250 5.32 16 11000 3 428 1840 116 8.2 7800 190 15.5 62 <0.05 0.6
BSG1125A 8/24/01 285.03 2140 7.05 15 1560 <3.0 336 89 73 5.8 766 215 0.2 179 <0.05 2
BSG1130A 9/12/01 328.79 1778 7.23 17 1420 <3.0 298 80 61 4.4 569 257 0.1 201 <0.05 2.3
BSG1133A 8/22/01 382.65 4530 6.47 16 4530 6 513 533 81 6 2720 219 0.1 137 <0.05 1.8
BSG1133B 8/22/01 381.95 3380 7.11 16 3150 3 612 198 75 5.8 1750 125 0.1 255 <0.05 0.4
BSG1137A 3/8/01 325.85 1556 7.39 14 1050 3 198 57 48 2.9 378 196 179
BSG1137B 3/8/01 326.44 1155 7.46 14 776 <3.0 126 52 39 3.5 336 117 148
BSG1148A 8/3/01 397.16 3940 6.88 17 3900 8 832 229 93 6.7 2484 162 0.2 322 <0.05 0.2
BSG1148B 8/7/01 396.98 1444 7.1 17 1020 <3.0 199 59 48 4.3 455 100 194
BSG1177A 8/17/01 387.68 11660 3.83 17 17700 <3.0 415 2590 73 14.9 12000 135 14.2 <5.0 <0.05 <0.2
BSG1177B 8/22/01 392.36 17710 3.34 16 32800 <3.0 390 4570 70 7.3 21300 155 49.7 <5.0 <0.05 <0.2
BSG1179A 1/4/01 384.9 10480 3.96 13 16000 5 407 2630 94 14.7 11500 147 <5.0
BSG1179B 1/5/01 387.3 10170 3.74 13.3 14400 <3.0 417 2190 71 18.6 10000 132 <5.0
BSG1179C 1/9/01 392.3 15760 3.81 14.1 29300 10 435 4040 59 11.5 18600 142 <5.0
BSG1180B 9/10/01 368.27 16480 3.54 16 32100 16 373 6320 98 17.7 21700 140 225 <5.0 7610 <0.05 <0.2
BSG1180C 9/13/01 361.62 6140 6.25 16 7490 10 502 1170 133 7 4940 129 116 264 <0.05 0.3
BSG1196B 9/7/01 351.48 7490 6.28 15 9440 3 430 1640 117 7.1 6600 140 0.2 215 <0.05 0.9
37
Table 4: Baseline Groundwater Study Total Metal and Field Analytical Data

SITE ID DATE DEPTH COND PH TEMP TDS TSS CA MG NA K SO4 CL F ALK ACD NO2_N NO3_N
feet Us/cm degree
C
mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l
BSG1196C 9/6/01 349.24 5680 6.64 14 6990 33 759 818 163 6.7 4650 163 6.6 367 <0.05 <0.2
ECG1113A 2/13/01 82.98 2250 7.17 14 2040 <3.0 446 96 64 4.8 1100 172 294
ECG1115A 7/11/01 316.13 23500 3.56 19 53200 6 366 5810 45 6.8 34400 165 10.8 <5.0 <0.05 <0.2
ECG1115B 8/29/01 305.5 4290 6.9 17 3890 <3.0 588 281 99 7.1 2300 153 0.1 640 <0.05 <0.2
ECG1115C 7/13/01 22700 4.67 19 40000 35 400 7090 130 21.2 28300 138 15 <5.0 <0.05 0.2
ECG1117A 7/19/01 18970 3.39 19 35300 3 395 4294 57 2.5 23900 157 76.1 <5.0 <0.05 <0.2
ECG1117B 7/19/01 3840 7.22 19 3690 <3.0 751 234 73 8.9 2290 127 2.5 291 <0.05 0.3
ECG1118A 8/8/01 378.49 13280 3.49 18 21800 3 436 2590 102 7.8 14949 168 32.4 <5.0 6220 <0.05 <0.2
ECG1118B 7/31/01 370.4 763 7.46 16 516 <3.0 85 27 39 6.5 166 54 0.2 141 <0.05 0.3
ECG1121A 3/20/01 397.31 13490 3.49 15 22100 <3.0 396 3460 100 8 14800 160 <5.0 5800
ECG1128A 8/15/01 235.54 22400 3.66 17 40500 3 370 6720 96 17.1 28400 144 141 <5.0 <0.05 <0.2
ECG1144A 8/30/01 376.4 13010 3.55 17 21100 3 390 2680 60 7.3 15800 143 44.8 <5.0 <0.05 <0.2
ECG1145A 3/5/01 266.66 18800 3.5 13 33600 8 428 4460 69 13.7 25100 165 <5.0 8070
ECG1145B 3/5/01 262.39 13680 4.51 14 19400 19 459 4460 117 16.5 14300 151 <5.0 1530
ECG1145C 3/6/01 252.98 3460 7.12 14 3360 9 686 218 56 8.3 2370 123 315
ECG1146 9/5/01 19900 3.31 15 43500 6 374 5390 58 10.9 28100 153 76.4 <5.0 13700 <0.05 <0.2
ECG1183A 9/19/01 44.47 3630 6.7 14 2980 22 519 134 221 8.3 846 676 0.3 305 <0.05 5.5
ECG1183B 9/19/01 33.77 2020 7.08 16 1450 19 223 79 100 9.9 130 488 177
ECG1184 8/15/01 45.5 1509 6.97 17 1170 <3.0 168 90 64 3.1 387 122 0.8 276 <0.05 0.3
ECG1186 7/13/01 36.77 2380 6.88 14 1720 12 317 76 138 4.9 599 380 0.2 203 <0.05 1.4
ECG1187 7/9/01 55.07 1785 7.11 14 980 <3.0 219 55 68 4.5 82 436 155
ECG1188 7/18/01 38.6 4030 6.86 14 3400 <3.0 700 135 239 6.4 1570 480 0.2 278 <0.05 0.6
ECG1189 8/7/01 225.06 916 7.39 15 615 6 114 34 32 4.7 17 220 0.3 139 <0.05 2
ECG1190 8/7/01 125.23 1108 7.26 15 788 <3.0 155 42 27 3.2 53 250 0.3 166 <0.05 1.4
ECG294 2/26/01 80.03 4390 6.51 15 4590 <3.0 524 460 143 9.8 2740 154 269
ECG297 9/18/01 64.9 4240 4.08 17 4260 <3.0 519 381 98 10 2790 156 <5.0 590
ECG299 7/17/01 151.42 2080 6.03 14 1510 <3.0 219 109 108 7.6 687 229 105
ECG900 7/17/01 148.83 1731 6.84 15 1150 <3.0 219 58 71 4.5 224 304 218
ECG901 7/18/01 138.28 1938 6.91 14 1330 <3.0 250 62 54 6.9 124 463 168
ECG902 8/29/01 164.32 1583 6.93 15 1090 <3.0 187 52 75 5.1 258 238 213
ECG903 7/10/01 116.23 1273 7.08 14 770 25 159 47 57 4 145 208 183
ECG904 8/29/01 151.31 2380 6.8 15 1880 <3.0 309 85 138 6.5 699 227 209
ECG905 8/29/01 206.22 2470 6.33 15 2210 <3.0 433 93 84 7.4 1120 130 175
ECG906 7/13/01 99.11 4370 7.07 14 3950 <3.0 701 173 276 11.5 1980 411 422
ECG907 8/21/01 98.18 2350 7.07 15 1430 <3.0 322 71 68 6.9 156 554 215
ECG908 8/21/01 4.95 1167 7.7 15 645 <3.0 46 39 142 6.1 80 223 159
ECG909 7/10/01 136.28 8920 4.16 21 11200 19 514 1630 315 12.7 7570 290 <5.0
ECG915 8/14/01 2600 7.28 12 1670 10 117 119 258 8.9 139 638 204
38
Table 4: Baseline Groundwater Study Total Metal and Field Analytical Data

SITE ID DATE DEPTH COND PH TEMP TDS TSS CA MG NA K SO4 CL F ALK ACD NO2_N NO3_N
feet Us/cm degree
C
mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l
ECG916 7/23/01 43.04 1171 8.25 24 700 6 53 37 144 6.2 238 139 181
ECG917 8/24/01 113.7 1800 7 14 1170 <3.0 229 56 88 5.1 123 402 0.2 187 <0.05 1.6
ECG922 7/20/01 101.72 1731 7.18 13 1010 <3.0 206 63 50 3.3 112 392 0.3 206 <0.05 0.9
ECG923 9/11/01 88.59 1620 7.4 14 1050 <3.0 133 19 188 3.8 103 368 179
ECG924 9/4/01 31.91 5100 6.46 14 4650 5 685 349 256 12.4 2210 474 468
ECG925 9/4/01 36.52 3840 6.62 14 2960 23 562 125 210 6 1050 562 384
ECG926 8/16/01 36.55 1569 6.96 17 946 3 184 54 74 4.7 133 291 228
ECG928 11/15/01 65.25 1119 7.39 13 711 <3.0 104 28 100 3.8 54 259 150
ECG931 9/4/01 50.27 7180 6.75 14 5120 <3.0 971 210 340 14.4 477 2200 211
ECG932 8/28/01 81.64 1078 7.31 16 642 27 114 49 32 3.2 126 120 241
ECG934 7/12/01 116.18 1302 6.93 14 933 <3.0 172 58 57 3.5 343 89 273
ECG935 8/31/01 3540 6.84 14 3270 <3.0 487 209 209 6.6 1700 215 421
ECG936 8/28/01 44.75 4060 6.71 13 4060 <3.0 579 312 186 5.4 2190 234 283
ECG937 8/31/01 237.98 1580 6.9 16 1080 3 211 49 84 2.9 352 166 262
ECG938 8/29/01 215.22 1241 7.08 15 778 <3.0 135 47 72 2.4 198 127 296
ECG940 8/30/01 122.13 643 7.13 12 466 <3.0 82 24 25 2 48 35 248
HMG1126A 9/4/01 274.46 1882 7.14 14 1330 <3.0 260 75 55 3.4 542 184 0.2 216 <0.05 1.3
HMG1126B 8/31/01 274.68 1352 7.17 14 800 3 172 45 47 3 211 158 0.1 239 <0.05 2.1
HMG1134A 9/12/01 166.63 1176 7.16 15 664 13 135 35 46 3.6 122 164 <0.1 194 <0.05 2.5
HMG1515 9/24/01 1750 7.12 16 1330 <3.0 212 54 87 7 109 363 224
HMG1623 11/14/00 55.96 1120 7.17 13.3 743 <3.0 137 36 64 2.9 171 81 <0.1 349 <0.05 1.4
HMG1856 4/26/01 2150 7.45 13.8 1330 12 206 52 86 6 300 321 298
HMG2067 5/16/01 1935 7.22 16.4 1240 13 211 52 94 20 110 403 217
HMG2436 5/16/01 1826 7.32 16.2 1200 <3.0 201 50 90 10.1 124 355 231
HMG2727 9/12/01 2720 6.97 17.8 1810 <3.0 346 103 76 4.8 355 545 0.2 263 <0.05 2.8
K109 9/19/01 2700 6.48 17 1980 <3.0 390 113 71 4.5 1020 153 0.1 180 <0.05 1.6
K26 3/22/01 191.12 5840 3.76 15 6960 11 432 601 103 2 4780 158 <5.0 1310
K72 6/5/01 193.86 2030 7.15 13 1200 7 189 64 96 7.3 193 378 179
LRG910 8/10/01 76.74 1965 6.9 15 1560 <3.0 323 88 85 3.9 819 155 0.1 174 <0.05 1.9
LRG911 7/26/01 127.13 2350 6.43 18 2110 4 418 117 60 9.4 1124 152 0.4 137 <0.05 1.2
LRG912 1/12/01 95.75 5840 3.59 13 6760 <3.0 466 716 195 8.1 4600 238 <5.0 1221
LTG1139 9/19/01 803 7.54 21 540 <3.0 72 27 61 16 31 148 0.3 156 <0.05 1
LTG1140A 6/12/01 166.13 1973 7.16 14 1460 <3.0 245 79 84 7.3 576 236 219
LTG1140B 6/12/01 165.82 717 7.45 14 429 16 58 25 38 6.5 32 107 164
LTG1147 9/10/01 2250 7.54 15 1630 <3.0 313 79 91 5.5 692 216 0.2 225 <0.05 2.5
LTG1167B 9/10/01 195.92 1630 7.14 13 1130 <3.0 204 62 64 3.1 453 122 0.2 269 <0.05 1.2
LTG1191 7/13/01 23.26 4970 6.43 14 4940 8 556 476 252 6.6 2790 359 2.8 303 <0.05 3.3
P190A 9/5/01 295.42 1990 7.16 16 1790 <3.0 330 100 80 <0.5 668 285 0.1 194 <0.05 2.6
39
Table 4: Baseline Groundwater Study Total Metal and Field Analytical Data

SITE ID DATE DEPTH COND PH TEMP TDS TSS CA MG NA K SO4 CL F ALK ACD NO2_N NO3_N
feet Us/cm degree
C
mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l
P190B 9/5/01 296.63 1626 7.21 15 1170 <3.0 170 65 53 3.4 214 250 0.1 179 <0.05 2.2
P208B 7/25/01 8990 4.86 16 11300 3 414 1910 97 12 8109 149 17 7 <0.05 0.9
P220 8/14/01 48.46 2100 7.1 15 1440 6 147 51 277 6.1 459 214 334
P225 6/14/01 33.91 1160 6.99 13 755 <3.0 141 38 70 4.8 110 194 201
P228 8/28/01 24.67 6860 5.94 14 7970 <3.0 432 1210 165 6.2 4910 329 103
P239 6/12/01 68.92 4170 6.61 13 3530 6 602 208 241 5.2 1870 375 493
P241B 8/24/01 391.16 8400 3.68 16 11500 <3.0 443 1600 67 9.1 6180 115 26.5 <5.0 <0.05 <0.2
P241C 8/1/01 295.47 1700 7.23 16 1300 <3.0 329 256 0.2 160 <0.05 2
P244A 3/14/01 44.66 8630 3.92 12 10100 44 509 1160 409 7.4 5250 1330 <5.0 492
P244B 8/15/01 47.94 5230 6.76 16 4630 <3.0 810 190 301 8.3 1370 921 0.2 473 <0.05 0.5
P244C 1/2/01 52.06 2440 7.21 12 2190 <3.0 450 98 136 7.4 418 689 282
P248A 7/21/01 84.77 2420 3.96 17 2000 <3.0 188 184 61 3.4 1200 182 5 <5.0 289 <0.05 1.4
P248B 7/21/01 84.45 3370 5.93 20 3520 4 471 310 65 9.7 2130 111 0.5 97 <0.05 0.8
P248C 7/21/01 79.51 1331 6.25 14 933 <3.0 165 65 35 3.1 432 117 3.2 120 <0.05 1.1
P272 8/16/01 76.08 3610 6.74 16 3070 3 564 153 190 12.4 1500 215 462
P279 3/12/01 326.47 17070 3.48 12 28800 22 372 4600 65 6.5 27300 157 <5.0 8680
RVG1164A 7/20/01 1493 7.31 15.3 906 <3.0 160 42 121 4.1 226 159 0.1 336 <0.05 3.7
RVG1164B 7/20/01 1588 7.41 17.3 974 <3.0 184 54 87 4.1 287 197 0.1 277 <0.05 2.6
RVG1164C 7/24/01 598 7.02 17 336 <3.0 40 15 62 3.2 34 86 0.2 121 <0.05 0.7
SRG946 1/11/01 118.38 15430 3.5 13 28700 69 401 3680 204 3.3 21600 165 <5.0 7390
W107 8/12/99 992 7.28 15.5 624 72 95 40 58 3.2 64 197 149
W189 3/5/01 745 7.43 17 482 <3.0 80 31 36 2.7 117 96 163
W22 7/13/01 1396 7.09 16 970 <3.0 183 53 48 4.6 258 150 0.2 268 <0.05 1.8
W361 8/29/01 1096 7.22 18 690 <3.0 104 37 51 3.2 46 210 0.2 152 <0.05 2.4
W363 9/11/01 1012 7.34 15 635 <3.0 104 37 41 3.1 164 119 0.2 156 <0.05 1.6
W387 8/29/01 1155 7.23 18 750 <3.0 113 37 56 3.2 48 228 0.2 154 <0.05 2.2
W409 9/25/01 1924 7.3 15 1540 3 248 68 78 6.4 183 393 0.2 207 <0.05 1.7
W412 7/13/01 1100 7.1 16 673 <3.0 116 32 77 2.6 105 146 0.4 222 <0.05 1.1
W41A 9/19/01 1224 6.98 20 1110 <3.0 159 61 64 3.3 285 102 282
WJG1154A 12/7/01 318.14 1490 7.24 14 1140 <3.0 235 74 59 4.2 483 138 159
WJG1154B 6/13/01 309.25 690 7.48 16 451 11 70 25 40 3 63 88 148
WJG1154C 7/14/01 312.32 821 7.22 15 538 <3.0 81 32 54 3.3 113 98 0.3 169 <0.05 0.4
WJG1169A 7/24/01 362.34 2390 7.17 15 1970 <3.0 375 92 113 4.1 903 251 3.5 201 <0.05 2.1
WJG1169B 8/16/01 362.4 2330 7.27 17 1710 <3.0 341 95 92 4.5 673 272 0.2 175 <0.05 2
WJG1170A 7/14/01 366.32 1342 7.24 16 976 <3.0 173 57 50 4 348 152 0.2 149 <0.05 1.8
WJG1171A 7/6/01 300.18 691 7.51 16 474 <3.0 75 25 34 2.3 71 80 154

40

Table 5: Baseline Groundwater Study Total and Dissolved Metals Analytical Data (mg/L)

SITE ID DATE AG T AG D AL T AL D AS T AS D BA T BA D CD T CD D CR T CR D CU T CU D FE T FE D HG T MN T MN D NI T NI D PB T PB D SE T SE D SEHY
D
SEHY
D D
ZN T ZN D
B1G1120A 7/20/01 <0.001 <0.001 486 483 0.024 0.023 <0.01 <0.01 1.06 1.01 0.01 0.01 211 21.1 2.09 2.09 3.1 296 296 9.82 9.82 <0.005 <0.005 <0.002<0.002 45.5 45.5
B1G951 9/18/01 <0.001 <0.001 1180 1100 0.034 0.031 <0.01 <0.01 0.463 0.463 0.074 0.074 65.2 65.2 259 246 <0.2 177 177 12.6 12.4 0.005 <0.005 0.008 0.005 81.3 80.1
B2G1176A 8/15/01 <0.001 <0.001 65.9 64.5 0.017 0.015 0.013 0.013 0.382 0.382 0.015 0.015 0.214 0.213 <0.3 <0.3 6.8 73.2 71.2 4.92 3.66 0.022 0.022 0.003 0.003 16.4 11.3
B2G1193 9/19/01 <0.001 <0.001 <0.1 <0.1 <0.005 <0.005 0.027 0.026 <0.001<0.001 <0.01 <0.01 <0.01 <0.01 <0.3 <0.3 <0.2 <0.01 <0.01 <0.05 <0.05 <0.005 <0.005 0.009 0.007 0.109 0.109
B3G1197A 9/18/01 <0.001 <0.001 0.215 0.045 0.006 0.006 0.092 0.092 <0.001<0.001 <0.01 <0.01 <0.01 <0.01 <0.3 <0.3 <0.2 0.013 <0.01 <0.05 <0.05 <0.005 <0.005 0.005 0.003 0.02 0.014
B3G1197B 9/17/01 <0.001 <0.001 <0.1 <0.1 0.009 0.008 0.092 0.091 <0.001<0.001 <0.01 <0.01 <0.01 <0.01 <0.3 <0.3 <0.2 <0.01 <0.01 <0.05 <0.05 <0.005 <0.005 <0.003<0.003 0.043 <0.02
B3G1197C 9/17/01 <0.001 <0.1 0.009 0.071 <0.001 <0.01 <0.01 <0.3 <0.01 <0.05 <0.005 <0.003 <0.02
BFG1195A 8/17/01 <0.001 <0.001 0.013 <0.1 0.006 0.005 0.023 0.022 <0.001<0.001 <0.01 <0.01 <0.01 <0.01 <0.3 <0.3 <0.2 <0.01 <0.01 <0.05 <0.05 <0.005 <0.005 0.01 0.006 0.012 <0.02
BFG1195B 8/15/01 <0.001 <0.001 <0.1 <0.1 0.005 <0.005 0.025 0.022 <0.001<0.001 <0.01 <0.01 <0.01 <0.01 <0.3 <0.3 <0.2 <0.01 <0.01 <0.05 <0.05 <0.005 <0.005 0.009 0.005 0.012 0.012
BFG1198A 2/28/01 <0.005 <0.001 <0.01 <0.005 0.004 <0.02
BRG286 5/17/01 <0.001 0.004 0.068 <0.001 <0.01 <0.01 <0.005 <0.002 <0.02
BRG287 5/16/01 <0.001 0.005 0.053 <0.001 <0.01 <0.01 <0.005 0.005 <0.02
BRG288 4/5/01 <0.001 <0.005 0.095 <0.001 <0.01 <0.01 <0.005 <0.002 <0.02
BRG289 4/5/01 <0.001 <0.005 0.112 <0.001 <0.01 <0.01 <0.005 <0.002 <0.02
BRG290 7/5/01 <0.001 <0.005 0.125 <0.001 <0.01 <0.01 <0.005 <0.002 <0.02
BRG291A 5/14/01 <0.001 0.006 0.031 <0.001 <0.01 <0.01 <0.005 0.008 <0.02
BRG919 5/14/01 <0.001 <0.005 0.122 <0.001 <0.01 <0.01 <0.2 <0.005 <0.002 <0.02
BRG920 5/14/01 <0.001 0.005 0.048 <0.001 <0.01 <0.01 <0.2 <0.005 <0.002 <0.02
BRG921 7/10/01 <0.001 0.01 0.049 <0.001 <0.01 <0.01 <0.2 <0.005 0.002 <0.02
BRG999 7/5/01 <0.001 <0.005 0.035 <0.001 <0.01 <0.01 <0.005 <0.002 <0.02
BSG1119B 8/8/01 <0.001 <0.001 13 9.37 0.011 0.009 0.025 0.021 0.337 0.296 <0.01 <0.01 0.032 0.029 <0.3 <0.3 0.4 181 134 5.54 4.66 <0.005 <0.005 0.005 0.004 0.223 0.208
BSG1125A 8/24/01 <0.001 <0.001 0.268 0.048 <0.005 <0.005 0.019 0.018 <0.001<0.001 <0.01 <0.01 0.022 <0.01 <0.3 <0.3 <0.2 0.115 0.016 <0.05 <0.05 <0.005 <0.005 0.045 0.014
BSG1130A 9/12/01 <0.001 <0.001 0.019 0.019 0.006 0.006 0.03 0.03 <0.001<0.001 <0.01 <0.01 <0.01 <0.01 <0.3 <0.3 <0.2 0.012 0.011 0.044 0.044 <0.005 <0.005 0.011 0.008 0.036 0.02
BSG1133A 8/22/01 <0.001 <0.001 0.075 <0.1 0.006 <0.005 0.023 0.021 0.011 0.011 <0.01 <0.01 <0.01 <0.01 <0.3 <0.3 <0.2 3.66 3.61 0.079 0.079 <0.005 <0.005 0.002 <0.002 0.033 0.03
BSG1133B 8/22/01 <0.001 <0.001 <0.1 <0.1 0.006 0.005 0.024 0.022 <0.001<0.001 0.022 0.022 <0.01 <0.01 <0.3 <0.3 <0.2 <0.01 <0.01 0.042 0.042 <0.005 <0.005 0.002 <0.002 0.017 0.015
BSG1137A 3/8/01 <0.005 <0.001 <0.01 <0.005 0.003 <0.02
BSG1137B 3/8/01 <0.005 <0.001 <0.01 <0.005 <0.002 <0.02
BSG1148A 8/3/01 <0.001 <0.001 0.02 <0.1 <0.005 <0.005 0.026 0.026 <0.001<0.001 <0.01 <0.01 <0.01 <0.01 <0.3 <0.3 <0.2 0.012 0.011 0.042 0.042 <0.005 <0.005 0.005 0.005 <0.02 <0.02
BSG1148B 8/7/01
BSG1177A 8/17/01 <0.001 <0.001 337 336 0.051 0.049 0.011 0.01 1.71 1.71 0.016 0.016 0.37 0.363 <0.3 <0.3 0.2 281 272 14.8 14.4 0.075 0.073 0.007 0.002 47.2 46.1
BSG1177B 8/22/01 <0.001 <0.001 1410 1410 0.065 0.057 <0.01 <0.01 1.29 1.28 0.016 0.016 80.7 77.8 107 98.8 2.7 424 407 22 21.6 0.035 0.034 0.104 0.007 109 106
BSG1179A 1/4/01 <0.001 0.047 0.01 1.23 0.011 7.6 0.034 0.089 71.3
BSG1179B 1/5/01 <0.001 0.043 0.012 0.982 0.011 8.029 0.082 0.085 42.32
BSG1179C 1/9/01 <0.001 0.047 <0.01 0.82 <0.01 64.2 0.017 0.055 84.382
BSG1180B 9/10/01 0.002 0.001 1050 1050 0.093 0.079 <0.01 <0.01 2.4 2.39 0.015 0.012 3.76 3.71 0.614 0.42 3.8 577 577 27.2 27.2 0.039 0.038 0.005 0.004 105 105
BSG1180C 9/13/01 <0.001 <0.001 9.64 9.64 0.005 <0.005 0.02 0.017 0.107 0.093 <0.01 <0.01 <0.01 <0.01 <0.3 <0.3 27 91.3 91.3 2.93 2.93 <0.005 <0.005 0.007 0.006 0.191 0.154
BSG1196B 9/7/01 0.004 <0.001 0.041 <0.1 0.009 0.007 0.023 0.023 0.014 0.014 0.025 0.025 0.023 0.021 <0.3 <0.3 1.3 3.08 2.89 0.137 0.122 <0.005 <0.005 0.006 0.006 0.056 0.056
41
Table 5: Baseline Groundwater Study Total and Dissolved Metals Analytical Data (mg/L)

SITE ID DATE AG T AG D AL T AL D AS T AS D BA T BA D CD T CD D CR T CR D CU T CU D FE T FE D HG T MN T MN D NI T NI D PB T PB D SE T SE D SEHY
D
SEHY
D D
ZN T ZN D
BSG1196C 9/6/01 0.003 <0.001 4.65 1.46 0.006 <0.005 0.027 0.022 0.104 0.09 <0.01 <0.01 0.02 <0.01 <0.3 <0.3 30 32.3 31.5 1.68 1.47 <0.005 <0.005 0.006 0.004 0.525 0.445
ECG1113A 2/13/01 <0.005 <0.001 <0.01 <0.005 0.002 <0.02
ECG1115A 7/11/01 <0.001 <0.001 3030 2650 <0.005 <0.005 <0.01 <0.01 0.99 0.9 0.28 0.27 160 145 629 629 0.4 368 336 27.9 25.6 <0.005 <0.005 <0.002<0.002 187 171
ECG1115B 8/29/01 <0.001 <0.1 0.006 0.024 <0.001 <0.01 <0.01 <0.3 42.3 0.024 0.052 <0.005 0.006 0.027
ECG1115C 7/13/01 <0.001 <0.001 275 275 0.056 0.054 0.015 0.015 1.01 0.975 0.016 0.016 0.668 0.621 0.522 0.497 11.6 975 975 38.8 38.8 0.007 0.007 0.006 0.006 49.2 49.2
ECG1117A 7/19/01 <0.001 <0.001 1720 1690 0.044 0.04 <0.01 <0.01 0.529 0.519 0.143 0.143 77.7 77.7 499 418 0.4 245 240 14.6 14.6 <0.005 <0.005 <0.002<0.002 117 117
ECG1117B 7/19/01 <0.001 <0.001 <0.1 <0.1 0.006 <0.005 0.027 0.024 <0.001<0.001 <0.01 <0.01 <0.01 <0.01 <0.3 <0.3 <0.2 <0.01 <0.01 <0.05 <0.05 <0.005 <0.005 0.004 0.004 0.026 0.018
ECG1118A 8/8/01 0.004 <0.001 865 823 0.068 0.046 <0.01 <0.01 0.927 0.895 0.032 0.012 50.4 47.5 137 118 1 316 291 14.4 13.6 0.016 <0.005 <0.002<0.002 77.1 71.2
ECG1118B 7/31/01 0.004 <0.001 0.068 0.065 0.005 <0.005 0.069 0.069 <0.001<0.001 0.012 0.01 <0.01 <0.01 <0.3 <0.3 <0.2 <0.01 <0.01 <0.05 <0.05 <0.005 <0.005 0.002 0.002 0.016 <0.02
ECG1121A 3/20/01 <0.001 783 0.036 <0.01 1.198 <0.01 52.323 51.5 7.8 405 <0.005 <0.002 91.452
ECG1128A 8/15/01 <0.001 <0.001 1040 1020 0.122 0.122 <0.01 <0.01 4.71 4.11 0.026 0.026 12.8 11.1 <0.3 <0.3 6.7 1160 1040 43.1 37.6 0.057 0.056 0.006 0.005 206 206
ECG1144A 8/30/01 <0.001 <0.001 855 841 0.034 0.032 <0.01 <0.01 0.57 0.558 0.015 0.013 53.1 52.7 159 <0.3 2.6 213 210 13.3 13.3 <0.005 <0.005 0.073 0.065 0.002 66.7 66.5
ECG1145A 3/5/01 <0.001 1590 0.068 0.01 2.36 0.014 69.5 43.3 526 26.9 0.193 0.004 141
ECG1145B 3/5/01 <0.001 267 0.036 0.012 0.658 <0.01 4.99 1.05 483 17.5 0.006 0.009 25.1
ECG1145C 3/6/01 <0.001 <0.1 0.007 0.031 <0.001 0.011 <0.01 <0.3 <0.01 0.059 <0.005 0.005 0.033
ECG1146 9/5/01 0.001 <0.001 2150 2050 0.085 0.07 <0.01 <0.01 1.08 0.907 0.018 0.011 133 129 549 458 7.5 405 389 24.8 24 <0.005 <0.005 0.006 0.006 134 130
ECG1183A 9/19/01 <0.001 <0.001 0.581 <0.1 0.007 0.006 0.043 0.027 <0.001<0.001 <0.01 <0.01 <0.01 <0.01 0.509 <0.3 <0.2 0.01 0.01 <0.05 <0.05 <0.005 <0.005 0.003 0.003 0.012 <0.02
ECG1183B 9/19/01 <0.001 0.036 <0.005 0.098 <0.001 <0.01 <0.01 <0.3 <0.01 <0.05 <0.005 <0.002 <0.02
ECG1184 8/15/01 <0.001 <0.001 0.039 0.009 <0.005 <0.005 0.021 0.021 <0.001<0.001 <0.01 <0.01 <0.01 <0.01 <0.3 <0.3 <0.2 <0.01 <0.01 <0.05 <0.05 <0.005 <0.005 <0.002<0.002 <0.02 <0.02
ECG1186 7/13/01 <0.001 <0.001 0.191 0.032 <0.005 <0.005 0.031 0.031 <0.001<0.001 <0.01 <0.01 <0.01 <0.01 <0.3 <0.3 <0.2 <0.01 <0.01 <0.05 <0.05 <0.005 <0.005 <0.002<0.002 0.014 <0.02
ECG1187 7/9/01 <0.001 <0.005 0.106 <0.001 <0.01 0.004 <0.005 0.002 <0.02
ECG1188 7/18/01 <0.001 <0.001 0.012 <0.1 <0.005 <0.005 0.031 0.028 <0.001<0.001 <0.01 <0.01 <0.01 <0.01 <0.3 <0.3 <0.2 <0.01 <0.01 <0.05 <0.05 <0.005 <0.005 <0.002<0.002 0.005 <0.02
ECG1189 8/7/01 <0.001 <0.001 0.151 <0.1 <0.005 <0.005 0.363 0.363 <0.001<0.001 <0.01 <0.01 <0.01 <0.01 <0.3 <0.3 <0.2 <0.01 <0.01 <0.05 <0.05 <0.005 <0.005 <0.002<0.002 <0.02 <0.02
ECG1190 8/7/01 <0.001 <0.001 0.014 <0.1 0.005 <0.005 0.164 0.161 <0.001<0.001 <0.01 <0.01 <0.01 <0.01 <0.3 <0.3 <0.2 <0.01 <0.01 <0.05 <0.05 <0.005 <0.005 <0.002<0.002 <0.02 <0.02
ECG294 2/26/01 <0.005 <0.001 <0.01 <0.005 0.003 0.178
ECG297 9/18/01 <0.005 0.087 4.01 0.052 0.004 10.2
ECG299 7/17/01 <0.001 <0.005 0.028 0.002 <0.01 0.097 <0.005 <0.002 0.15
ECG900 7/17/01 <0.001 <0.005 0.075 <0.001 <0.01 <0.01 <0.005 <0.002 <0.02
ECG901 7/18/01 <0.001 <0.005 0.153 <0.001 <0.01 <0.01 <0.005 <0.002 <0.02
ECG902 8/29/01 <0.001 0.006 0.098 <0.001 <0.01 <0.01 <0.005 <0.002 <0.02
ECG903 7/10/01 <0.001 0.006 0.161 <0.001 <0.01 <0.01 <0.005 <0.002 <0.02
ECG904 8/29/01 <0.001 0.005 0.036 <0.001 <0.01 <0.01 <0.005 <0.002 <0.02
ECG905 8/29/01 <0.001 <0.005 0.028 <0.001 <0.01 <0.01 <0.005 <0.002 <0.02
ECG906 7/13/01 <0.001 <0.005 0.031 <0.001 <0.01 <0.01 <0.005 <0.002 0.022
ECG907 8/21/01 <0.001 <0.005 0.261 <0.001 <0.01 <0.01 <0.005 0.002 <0.02
ECG908 8/21/01 <0.001 <0.005 0.036 <0.001 <0.01 <0.01 <0.005 <0.002 0.032
ECG909 7/10/01 <0.001 0.031 0.021 0.061 0.044 6.45 0.01 <0.002 8.85
ECG915 8/14/01 <0.001 <0.005 0.065 <0.001 <0.01 <0.01 <0.005 0.002 <0.02
ECG916 7/23/01 <0.001 0.006 0.018 <0.001 <0.01 <0.01 <0.005 <0.002 <0.02
42
Table 5: Baseline Groundwater Study Total and Dissolved Metals Analytical Data (mg/L)

SITE ID DATE AG T AG D AL T AL D AS T AS D BA T BA D CD T CD D CR T CR D CU T CU D FE T FE D HG T MN T MN D NI T NI D PB T PB D SE T SE D SEHY
D
SEHY
D D
ZN T ZN D
ECG917 8/24/01 <0.001 <0.001 0.028 0.017 <0.005 <0.005 0.143 0.136 <0.001<0.001 <0.01 <0.01 <0.01 <0.01 <0.3 <0.3 <0.2 <0.01 <0.01 <0.05 <0.05 <0.005 <0.005 <0.002<0.002 <0.02 <0.02
ECG922 7/20/01 <0.001 <0.001 0.012 <0.1 0.006 0.005 0.077 0.074 <0.001<0.001 <0.01 <0.01 <0.01 <0.01 <0.3 <0.3 <0.2 <0.01 <0.01 <0.05 <0.05 <0.005 <0.005 <0.002<0.002 0.025 <0.02
ECG923 9/11/01 <0.001 0.007 0.168 0.001 <0.01 <0.01 <0.005 <0.002 0.064
ECG924 9/4/01 <0.001 0.006 0.027 0.002 0.013 <0.01 <0.005 <0.002 0.075
ECG925 9/4/01 <0.001 0.006 0.03 <0.001 0.018 <0.01 <0.005 0.002 <0.02
ECG926 8/16/01 <0.001 0.008 0.127 <0.001 <0.01 <0.01 <0.005 <0.002 0.028
ECG928 11/15/01 <0.001 0.006 0.137 <0.001 <0.01 <0.01 <0.2 <0.005 <0.002 <0.02
ECG931 9/4/01 <0.001 0.007 0.106 <0.001 <0.01 <0.01 <0.005 0.009 <0.02
ECG932 8/28/01 <0.001 <0.005 0.034 <0.001 <0.01 <0.01 <0.005 <0.002 <0.02
ECG934 7/12/01 <0.001 <0.005 0.039 <0.001 <0.01 <0.01 <0.005 <0.002 <0.02
ECG935 8/31/01 <0.001 <0.005 0.022 <0.001 <0.01 0.008 <0.005 0.003 <0.02
ECG936 8/28/01 <0.001 0.023 0.012 <0.001 <0.01 <0.01 <0.005 <0.002 0.02
ECG937 8/31/01 <0.001 0.006 0.02 <0.001 <0.01 <0.01 <0.005 <0.002 0.013
ECG938 8/29/01 <0.001 0.01 0.025 <0.001 <0.01 <0.01 <0.005 <0.002 0.01
ECG940 8/30/01 <0.001 <0.005 0.044 <0.001 <0.01 <0.01 <0.005 <0.002 0.012
HMG1126A 9/4/01 <0.001 <0.001 0.017 <0.1 <0.005 <0.005 0.046 0.046 <0.001<0.001 <0.01 <0.01 <0.01 <0.01 <0.3 <0.3 <0.2 <0.01 <0.01 <0.05 <0.05 <0.005 <0.005 0.005 0.004 <0.02 <0.02
HMG1126B 8/31/01 <0.001 <0.001 0.103 <0.1 0.005 <0.005 0.082 0.063 <0.001<0.001 0.014 <0.01 <0.01 <0.01 <0.3 <0.3 0.2 <0.01 <0.01 <0.05 <0.05 <0.005 <0.005 0.007 0.004 <0.02 <0.02
HMG1134A 9/12/01 <0.001 <0.001 0.223 0.083 0.007 0.007 0.096 0.084 <0.001<0.001 0.021 <0.01 <0.01 <0.01 1.8 <0.3 <0.2 0.364 <0.01 <0.05 <0.05 0.008 <0.005 0.006 0.006 0.038 0.038
HMG1515 9/24/01 <0.001 <0.005 0.201 <0.001 <0.01 <0.01 <0.005 0.022
HMG1623 11/14/00 <0.001 <0.001 0.01 <0.1 <0.005 <0.005 0.032 0.031 <0.001<0.001 <0.01 <0.01 <0.01 <0.01 0.98 <0.3 <0.2 0.037 0.013 <0.05 <0.05 <0.005 <0.005 0.003 <0.003 0.07 0.07
HMG1856 4/26/01 <0.001 <0.001 0.008 <0.1 0.006 <0.005 0.05 0.048 <0.001<0.001 <0.01 <0.01 <0.01 <0.01 <0.3 <0.3 <0.01 <0.01 <0.05 <0.05 <0.005 <0.005 0.026 0.022
HMG2067 5/16/01 <0.001 <0.001 0.006 <0.1 0.006 <0.005 0.254 0.254 <0.001<0.001 0.012 <0.01 0.026 <0.01 1.28 <0.3 0.02 <0.01 <0.05 <0.05 0.006 <0.005 0.038 0.038
HMG2436 5/16/01 <0.001 <0.001 0.008 <0.1 <0.005 <0.005 0.23 0.22 <0.001<0.001 <0.01 <0.01 <0.01 <0.01 0.338 <0.3 0.012 0.012 <0.05 <0.05 <0.005 <0.005 0.058 0.058
HMG2727 9/12/01 <0.001 <0.001 <0.1 <0.1 <0.005 <0.005 0.062 0.058 <0.001<0.001 <0.01 <0.01 <0.01 <0.01 <0.3 <0.3 <0.2 0.029 0.026 0.072 0.041 <0.005 <0.005 0.017 0.011 2.04 1.754
K109 9/19/01 <0.001 <0.001 <0.1 <0.1 0.006 0.006 0.032 0.032 <0.001<0.001 <0.01 <0.01 <0.01 <0.01 <0.3 <0.3 <0.2 <0.01 <0.01 <0.05 <0.05 <0.005 <0.005 0.007 0.005 0.035 0.035
K26 3/22/01 185 0.011 0.15 67.8 16.8 40.7 0.007 <0.002 17.4
K72 6/5/01 <0.001 <0.005 0.064 <0.001 <0.01 <0.01 <0.005 0.002 <0.02
LRG910 8/10/01 <0.001 <0.001 0.015 <0.1 <0.005 <0.005 0.023 0.022 <0.001<0.001 <0.01 <0.01 <0.01 <0.01 <0.3 <0.3 <0.2 <0.01 <0.01 <0.05 <0.05 <0.005 <0.005 0.003 0.003 <0.02 <0.02
LRG911 7/26/01 <0.001 <0.001 0.244 0.058 <0.005 <0.005 0.024 0.024 0.004 0.004 <0.01 <0.01 0.172 0.166 <0.3 <0.3 <0.2 0.474 0.474 0.074 0.072 <0.005 <0.005 <0.002<0.002 0.473 0.473
LRG912 1/12/01 <0.001 0.013 <0.01 0.246 <0.01 33.2 <0.2 <0.005 <0.002 20.9
LTG1139 9/19/01 <0.001 <0.001 0.094 <0.1 0.005 <0.005 0.143 0.119 <0.001<0.001 <0.01 <0.01 <0.01 <0.01 <0.3 <0.3 <0.2 0.022 0.014 <0.05 <0.05 <0.005 <0.005 0.003 <0.003 0.019 <0.02
LTG1140A 6/12/01 <0.005 <0.001 <0.01 <0.005 <0.002 0.01
LTG1140B 6/12/01 <0.005 <0.001 <0.01 <0.005 <0.002 <0.02
LTG1147 9/10/01 <0.001 <0.001 0.026 <0.1 0.006 0.006 0.023 0.023 <0.001<0.001 0.012 0.012 <0.01 <0.01 <0.3 <0.3 <0.2 <0.01 <0.01 <0.05 <0.05 <0.005 <0.005 0.011 0.008 0.016 0.011
LTG1167B 9/10/01 0.002 <0.001 4.129 0.173 0.008 0.006 0.074 0.033 <0.001<0.001 0.011 0.011 <0.01 <0.01 2.7 <0.3 <0.2 0.037 0.011 0.051 <0.05 0.007 <0.005 0.011 0.008 0.021 0.01
LTG1191 7/13/01 <0.001 <0.001 0.03 <0.1 <0.005 <0.005 0.021 0.021 0.068 0.068 <0.01 <0.01 0.026 0.022 <0.3 <0.3 <0.2 0.658 0.658 0.221 0.221 <0.005 <0.005 <0.002<0.002 20.1 20.1
P190A 9/5/01 0.003 <0.001 0.497 <0.1 0.054 <0.005 0.056 0.017 0.004 <0.001 0.076 <0.01 0.054 <0.01 152 5.14 <0.2 0.112 <0.01 <0.05 <0.05 0.36 <0.005 0.018 0.009 1.57 1.13
P190B 9/5/01 <0.001 <0.001 <0.1 <0.1 0.004 <0.005 0.035 0.024 <0.001<0.001 0.012 <0.01 <0.01 <0.01 0.869 0.457 <0.2 0.014 <0.01 <0.05 <0.05 <0.005 <0.005 0.014 0.007 1.05 0.566
P208B 7/25/01 <0.001 <0.001 74.7 74 0.021 0.013 0.023 0.018 1.61 1.3 <0.01 <0.01 0.824 0.676 <0.3 <0.3 <0.2 206 204 12.6 12.4 0.031 0.026 0.004 0.003 99.5 99.5
43
Table 5: Baseline Groundwater Study Total and Dissolved Metals Analytical Data (mg/L)

SITE ID DATE AG T AG D AL T AL D AS T AS D BA T BA D CD T CD D CR T CR D CU T CU D FE T FE D HG T MN T MN D NI T NI D PB T PB D SE T SE D SEHY
D
SEHY
D D
ZN T ZN D
P220 8/14/01 <0.001 0.019 0.041 <0.001 0.011 <0.01 <0.005 <0.002 <0.02
P225 6/14/01 <0.001 0.006 0.12 <0.001 <0.01 <0.01 <0.2 0.007 <0.002 <0.02
P228 8/28/01 <0.001 <0.005 0.011 0.037 <0.01 0.248 <0.005 <0.002 3.28
P239 6/12/01 <0.001 <0.005 <0.01 <0.001 <0.01 <0.01 <0.2 <0.005 <0.002 <0.02
P241B 8/24/01 <0.001 <0.001 1650 1600 0.022 0.022 <0.01 <0.01 0.685 0.685 <0.01 <0.01 76.3 74.7 94.4 88.9 <0.2 758 743 37.7 37.2 0.014 0.014 0.002 0.002 189 185
P241C 8/1/01 0.001 <0.001 0.07 0.065 0.005 <0.005 0.034 0.034 <0.001<0.001 <0.01 <0.01 <0.01 <0.01 <0.3 <0.3 <0.2 <0.01 <0.01 <0.05 <0.05 <0.005 <0.005 0.004 0.004 0.012 0.012
P244A 3/14/01 0.004 0.008 0.013 0.192 0.012 5.26 0.036 0.004 7.32
P244B 8/15/01 <0.001 <0.001 0.009 <0.1 0.006 0.006 0.021 0.021 <0.001<0.001 0.017 0.017 <0.01 <0.01 <0.3 <0.3 <0.2 0.018 0.018 0.055 0.055 <0.005 <0.005 0.004 0.004 0.016 0.016
P244C 1/2/01 <0.001 0.007 0.098 <0.001 <0.01 <0.01 <0.005 0.002 <0.02
P248A 7/21/01 <0.001 <0.001 31.2 31.1 <0.005 <0.005 <0.01 <0.01 0.037 0.036 <0.01 <0.01 11.5 11.5 <0.3 <0.3 <0.2 8.06 7.58 0.519 0.504 0.015 0.014 <0.002<0.002 4.83 4.83
P248B 7/21/01 <0.001 <0.001 2.24 1.71 <0.005 <0.005 0.015 0.01 0.059 0.059 <0.01 <0.01 3.78 3.78 <0.3 <0.3 <0.2 13.1 12.6 0.443 0.417 <0.005 <0.005 <0.002<0.002 4.92 4.92
P248C 7/21/01 <0.001 <0.001 0.042 0.025 <0.005 <0.005 0.02 0.016 0.003 0.003 <0.01 <0.01 0.259 0.233 <0.3 <0.3 <0.2 0.16 0.134 0.04 <0.05 <0.005 <0.005 <0.002<0.002 0.31 0.239
P272 8/16/01 <0.001 0.006 0.026 <0.001 <0.01 <0.01 <0.005 <0.002 <0.02
P279 3/12/01 1440 0.045 1.1 103 2.9 403 <0.005 0.007 128
RVG1164A 7/20/01 <0.001 <0.001 0.01 0.006 0.004 0.004 0.036 0.034 <0.001<0.001 0.005 0.002 <0.01 <0.01 <0.3 <0.3 <0.2 <0.01 <0.01 <0.05 <0.05 <0.005 <0.005 0.007 0.004 0.019 <0.02
RVG1164B 7/20/01 <0.001 <0.001 0.018 <0.1 0.006 0.004 0.106 0.106 <0.001<0.001 0.013 0.005 <0.01 <0.01 <0.3 <0.3 <0.2 <0.01 <0.01 <0.05 <0.05 <0.005 <0.005 0.013 0.008 0.017 <0.02
RVG1164C 7/24/01 <0.001 <0.001 0.011 0.007 0.008 0.007 0.088 0.088 <0.001<0.001 <0.01 <0.01 <0.01 <0.01 <0.3 <0.3 <0.2 <0.01 <0.01 <0.05 <0.05 <0.005 <0.005 0.005 <0.003 0.017 <0.02
SRG946 1/11/01 0.038 0.611 70.2 <0.005 <0.002 80.6
W107 8/12/99 <0.001 <0.005 0.056 <0.001 <0.01 <0.01 <0.005 <0.002 0.022
W189 3/5/01 0.007 <0.001 <0.01 <0.005 0.002 0.02
W22 7/13/01 <0.001 <0.001 0.028 0.006 <0.005 <0.005 0.058 0.054 <0.001<0.001 <0.01 <0.01 <0.01 <0.01 <0.3 <0.3 <0.2 0.02 <0.01 <0.05 <0.05 <0.005 <0.005 0.006 <0.003 0.023 0.007
W361 8/29/01 <0.001 <0.001 <0.1 <0.1 0.01 0.01 0.176 0.167 <0.001<0.001 <0.01 <0.01 <0.01 <0.01 <0.3 <0.3 <0.2 <0.01 <0.01 <0.05 <0.05 <0.005 <0.005 0.005 0.005 0.021 0.021
W363 9/11/01 <0.001 <0.001 0.287 <0.1 0.011 0.011 0.092 0.092 <0.001<0.001 <0.01 <0.01 <0.01 <0.01 <0.3 <0.3 <0.2 0.068 <0.01 <0.05 <0.05 <0.005 <0.005 0.006 0.005 0.04 0.015
W387 8/29/01 <0.001 <0.001 <0.1 <0.1 0.009 0.009 0.179 0.179 <0.001<0.001 <0.01 <0.01 <0.01 <0.01 <0.3 <0.3 <0.2 <0.01 <0.01 <0.05 <0.05 <0.005 <0.005 0.004 0.004 <0.02 <0.02
W409 9/25/01 <0.001 <0.001 0.106 0.015 <0.005 <0.005 0.109 0.109 <0.001<0.001 0.058 0.011 0.022 <0.01 0.469 <0.3 <0.2 0.027 0.014 <0.05 <0.05 <0.005 <0.005 0.006 0.005 0.015 <0.02
W412 7/13/01 <0.001 <0.001 0.207 0.03 0.006 0.006 0.12 0.12 <0.001<0.001 <0.01 <0.01 <0.01 <0.01 <0.3 <0.3 <0.2 0.664 0.078 <0.05 <0.05 <0.005 <0.005 0.005 <0.003 0.04 0.012
W41A 9/19/01 <0.001 <0.005 0.027 <0.001 <0.01 <0.01 <0.005 <0.002 0.243
WJG1154A 12/7/01 0.01 <0.001 <0.01 <0.005 0.006 <0.02
WJG1154B 6/13/01 <0.005 <0.001 0.024 <0.005 0.005 0.014
WJG1154C 7/14/01 <0.001 <0.001 0.05 <0.1 0.01 0.009 0.042 0.042 <0.001<0.001 0.011 <0.01 <0.01 <0.01 <0.3 <0.3 <0.2 <0.01 <0.01 <0.05 <0.05 <0.005 <0.005 <0.002<0.002 0.013 <0.02
WJG1169A 7/24/01 <0.001 <0.001 0.036 <0.1 0.005 0.005 0.026 0.021 <0.001<0.001 <0.01 <0.01 <0.01 <0.01 <0.3 <0.3 <0.2 <0.01 <0.01 <0.05 <0.05 <0.005 <0.005 0.008 0.005 0.005 <0.02
WJG1169B 8/16/01 <0.001 <0.001 0.016 <0.1 0.008 0.008 0.025 0.025 <0.001<0.001 <0.01 <0.01 <0.01 <0.01 <0.3 <0.3 <0.2 <0.01 <0.01 <0.05 <0.05 <0.005 <0.005 0.01 0.008 <0.02 <0.02
WJG1170A 7/14/01 <0.001 <0.001 0.014 <0.1 0.008 <0.005 0.068 0.05 <0.001<0.001 0.007 <0.01 <0.01 <0.01 <0.3 <0.3 <0.2 <0.01 <0.01 <0.05 <0.05 <0.005 <0.005 0.004 <0.003 <0.02 <0.02
WJG1171A 7/6/01 0.007 <0.001 <0.01 <0.005 <0.002 <0.02

44
7.0 References

Environmental Protection Agency and Utah Department of Environmental Quality, 2000,
Record of Decision, Kennecott South Zone, Operable Unit 2, Southwest Jordan
River Valley Ground Water Plumes, December 13, 130 p.
Kennecott Utah Copper Corporation, 1999a, Standard Operating Procedures for Water
Sampling, Version 4, December, 309 p.
Kennecott Utah Copper Corporation, 1999b, Quality Assurance Project Plan for the
Ground Water Characterization and Monitoring Plan, Revision 5, December, 29
p.
Kennecott Utah Copper Corporation, 2000, Ground Water Characterization and
Monitoring Plan, revision 6, April, 91 p.
Kennecott Utah Copper Corporation, work in progress A, Groundwater Modeling Studies
Work Plan.
Kennecott Utah Copper Corporation, work in progress B, Data Records and Management
Plan for South Facilities Groundwater Remedial Design.
Shepherd Miller, Inc., 1997, Determination of Constituents Above Background and
Baseline Concentrations in Ground Water, Southwestern Jordan Valley, Utah.
June, 51 p. plus appendices. (Included as Appendix B to the Remedial
Investigation and Feasibility Study Report, KUCC, 1998)

45

Figure 1: September 2001 Potentiometric Surface

46
Figure 2: April 2002 Potentiometric Surface

47
Figure 3: Potentiometric Change Map 5/01 to 4/02
APPROXIMATE FLOW RATE AT PRODUCTION/EXTRACTION WELLS (gpm)
Well ID Apr-01 Sep-01 Apr-02 Comments
LTG1139 Not Pumping 850 Not Pumping
LTG1147 1050 1050 Not pumping
ECG1146 900 520 720
B2G1193 1975 1900 1800 Well was down Oct.01 to Feb.02
K109(BFG1200) 1460 1200 1800
Well was down Oct.01 to Feb.02.
Switched to BFG1200 in Feb. 2002
W363 Not Pumping 2400 Not Pumping
W361 Not Pumping 1485 Not Pumping
W387 Not Pumping 1945 Not Pumping
W420 Not Pumping 1600 Not Pumping
West Jordan Wells W363,361, 387, &420
Were pumping intermittently in 9/01, and
had been off since ~Oct.01