DRC-2010-001906 - 0901a06880361a2e

,.''v iiLi^f*:--
State of Utah
GARY R. HERBERT
Govemor
GREG BELL
Lieutenant Governor
Department of <
Environmental Quality
Amanda Smith
Executive Director
Drv ISION OF RADIATION CONTROL
Dane L. Finerfrock
Director
RC-201U-00190
MEMORANDUM
TO:
FROM:
DATE:
SUBJECT:
Loren Morton
Dean Henderson
Febmary 16, 2010
2|i4//^
M n,lr? /"
Review of the 3'^'' Quarter 2009 Chloroform Monitoring Report for the Chloroform
Contamination Investigation
Dennison Mines (USA) Corp. (hereafter "DUSA")
White Mesa Uranium Mill, near Blanding, Utah
On December 2, 2009 the Division of Radiation Control (hereafter "DRC") received 3"* Quarter
2009 Chloroform Monitoring Report (hereafter "Report"). For the review of this Report the
following regulatory enforcement documents will be used:
• DUSA was issued Ground Water Quality Discharge Permit No. UGW370004 (hereafter
"Permit") on March 8, 2005; last revised on March 17, 2008.
• The DUSA Quality Assurance Plan (hereafter "QAP") was originally dated November 17,
2006, (Revision 1.0); and was approved by the DRC Executive Secretary on December 1,
2006. The DUSA QAP was last revised by DUSA on November 18, 2008 (Revision. 4.0)
and approved on March 30, 2009 by the Executive Secretary.
The review for the Report will be: 1) summary of violations, 2) summary of parameters
exceeding groundwater quality standards, 3) carbon tetrachloride and Methylene chloride
exceeding groundwater quality standards (hereafter "GWQS"), 4) elevated chloride concentrations
and, 5) status and condition of the chlorofoim plume.
SUMMARY OF VIOLATIONS
There are three violations and one recommendation identified for the 3'^'' quarter 2009 chlorofonn
monitoring event. The first three violations listed below are repeat violations of the same
problems identified in the November 10, 2009 Notice of Violation and Compliance Order, Docket
No. UGW09-05 (hereafter "NOV"), Violation No. 1, 2 and 3. This November 2009 NOV was for
168 North 1950 West • Salt Lake City, UT
Mailing Address: P.O. Box 144850 • Salt Uke City, UT 84114-4850
Telephone [phone] • Fax [phone] • T.D.D. [phone]
www.deq.ittnh.^ov
Printed on 100% recycled paper
Page 2
the 3^'' and 4"^ quarter 2008 and 1^' quarter 2009 chloroform monitoring reports. On December 14,
2009 DUSA responded on how they would resolve the violations listed in the November 2009
NOV. In a letter dated January 6, 2010 DRC accepted DUSA response to resolve all violations
listed in the NOV. Since, DUSA response and to the November NOV occurred after the 3"*
quarter 2009 sampling event (September 2009) DUSA did not have the opportunity to resolve the
repeat violations identified in the 3'^'' quarter monitoring event. Therefore, DRC feels it is
reasonable to except DUSA December 14, 2009 response to resolve Violations No. 1, 2, and 3 of
the November 2009 NOV for the corresponding first three repeat violations listed below and
therefore no enforcement is recommended.
I. (Repeat violation identified in the November 2009 NOV, Violation No. 1)
Decontamination procedures reported did not follow decontamination procedures required
in Appendix A and section 6.2.5 of the QAP. Decontamination procedures in Appendix A
item 1) state:
"Decontamination of All sampling equipment will follow the decontamination procedure
outlined is section 6.2.5 ofthe QAP. "
Requirements in section 6.2.5 ofthe QAP are:
6.2.5 Decontamination Procedure
Ifa portable (non-dedicated) pump is to be used, prior to each sampling event, at the
beginning ofeach day during the sampling event, and between each sampling location
(well), decontaminate the portable (non-dedicated) sampling pump prior to its use for
purging or sampling using the following procedure:
"a) wash the pump probe, probe sheath and other pump equipment that may come in
contact with the sampling well inner casing or well water (the "Sampling Equipment")
with a nonphosphate detergent;
b) rinse the Sampling Equipment with de-ionized water;
c) rinse the Sampling Equipment with dilute (.IN) hydrochloric or nitric acid; and
d) rinse the Sampling Equipment with de-ionized water. "
According to part of section 2.2.1(b) of the Report: "Before leaving the Mill office, the
pump and hose are rinsed with de-ionized ("Dl") water. Mill personnel then proceed to
thefirst well which is the well indicating the lowest concentration of chloroform based on
the previous quarters sampling results". Also, according to part of section 2.2.2(a) of the
Report: "The dedicated portable pump is appropriately decontaminated prior to each
purging event and a QA rinsate sample is collected after said decontamination but prior to
the commencement ofthe sampling event. In response to discussions held with UDEQ on
October 29 2009 relative to purging and decontamination of sampling equipment mill
sampling personne! have been re-instructed as to decontamination procedures in
accordance with Section 6.2.5 ofthe QAP cmd purging practices. "
In this comment [2.2.2(a)] the DUSA recognized their failure to follow decontamination
procedures and committed follow decontamination procedures as required in section 6.2.5
of the QAP in the future. In addition, in section 3.3.3(b) of the Report DUSA followed the
procedure for corrective action as outlined in section 10.2 of the QAP to resolve this
violation. As stated above, this is a repeat violation of the same problem identified in the
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November 2009 NOV, Violation No. 1. Stated below is DUSA response on how they will
resolve this violation in their December 14, 2009 letter. DRC feels it is reasonable to
accept DUSA response in the Report [section 3.3.3(b)] and their response for Violation
No. 1 (stated below) for this repeat violation and no enforcement is recommended.
DUSA December 14, 2009 response to resolve violation 1 identifled in the November
2009 NOV
"a)Root Cause ofthe Noncorhpliance
The root cause ofthe noncompliance was a failure to fully understand the
decontamination process outlined in the QAP as it relates to chloroform sampling with
non-dedicated pumping equipment. The sampling technicians and QA Manager
believed that the process outlined in Section 1) ofthe Chloroform Investigation
Monitoring Quality Assurance Program (Appendix A to the QAP), whereby samples
are collected in sequential order from the least affected to most affected well, allowed
for decontamination priory to the sampling event but did not require decontamination
betwee?! individual sampling locations. As this was the past practice for many years
and because the sequential sampling was still described in the QAP, the technicians
and QA Manager failed tq understand that the reference to Section 6.2.5 ofthe QAP
required decontamination between individucd sampling locations, in addition to
decontamination prior to the sampling event.
b) Steps That Have Been Taken to Correct the Violation
The QA Manager and sampling technicians have reviewed the matter and the QAP
language and now are fully aware that the reference to Section 6.2.5 ofthe QAP at
Section I) ofthe Chloroform Investigation Monitoring Quality Assurance Program
applies not only to decontamination prior to chloroform sampling events but between
sampling locations as well.
c) Date When Compliance Was or Will be Regained
Samples collected for the ]4'' Quarter, 2009 will be collected with the appropriate
understanding ofthe QAP, and in accordance with Section 6.2.5. Equipment
decontamination will occur prior to the sampling event and between individual sample
locations.
d) Steps Taken to Prevent Reoccurrence ofthe Noncompliance
i. The steps outlined in I .b) above have been taken.
ii. DUSA is evaluating the installation of dedicated pumping ecjuipment for all
chloroform monitoring wells.
2. (Repeat violation identified in the November 2009 NOV, Violation No. 2) In the 3""
quarter 2009 sampling event monitoring well TW4-14 did not follow purge procedures as
required in section 6.2.7(e) of the QAP. Section 6.2.7(e) requires:
"e) Purging, Where Use of Pump is Not Effective
For wells where a pump is not effective for purging and/or sampling (wells with
shallow water columns, i:e. where the water column is less than five feet above the
bottom ofthe well casingior the wells over two days to recover from purging), a
Page 4
disposable bailer, made of inert materials, may be used. Ifa bailer is used, the
following procedure will be followed:
(i) Use the sound level instrument to determine the water column and figure the
amount of water that must be evacuated;
(ii) Attach a 3" disposable bailer to a rope and reel;
(iii)Lower the bailer into the well and listen for contact with the solution. Once
contact is made, allow the bailer to gradually sink in the well, being careful not to
allow the bailer to come in contact with the bottom sediment;
(iv) After the bailer is full, retrieve the bailer and discharge the water from the bailer
into 5 gallon buckets. By doing this, on can record the number of gallons purged;
(v) After the bailer is emptied, lower the bailer back into the well and gain another
sample as before. This process will continue until the two casing volumes have
been collected of until no more water can be retrieved. Wlien the process is
finished for the well, the bailer will be disposed of; and
(vi) Take field measurements referred to in paragraph 6.2.7(v) above from the water in
the buckets;"
In the second paragraph in the first page of Appendix A of the QAP it states:
"Specifically, the mill will use the same sampling regimen for the Chloroform
Investigation that is utilized for groundwater sampling under its groundwater discharge
permit, as set forth in the attached groundwater discharge permit Quality Assurance Plan
(QAP), except as set forth below:" subsequent language in Appendix A has no exceptions
to the well purging requirements outlined in section 6.2.7(e) of the QAP.
According to the comments recorded in field data work sheet for TW4-14 (found in under
Tab B of the Report), it appears purging was attempted but a field note states, 'Wor enough
water to purge. " No additional explanation for not purging this well was written in the
Report. According to the water level measurement below land surface (hereafter "bis) for
TW4-14 recorded under Tab G in the Report, groundwater on this date was measured at
87.34 feet bis. And according to the well completion details for TW4-14 the well depth is
92.5 feet bis (HGC 2002). Therefore, there was approximately 5.1 feet of water in the well
column which qualifies TW4-14 to follow the purging procedures outlined in section
6.2.7(e) of the QAP.
As stated above, this is a repeat violation of the same problem identified in the November
2009 NOV, Violation No. 2. Stated below is DUSA response on how they would resolve
this violation in their December 14, 2009 letter. For the reasons stated above, DRC staff
feels it is also reasonable to accept DUSA response for Violation No. 2 for this repeat
violation and no enforcement is recommended.
DUSA December 14, 2009 response to resolve violation 2 identifled in the November
2009 NOV
"a) Root Cause ofthe Noncompliance
Well TW4-14 produces very little water and has been difficult to sample as a result.
Due to the difficulty in obtaining samples (and evacuating 2 casing volumes) the
sampling technicians believed that obtaining a sample without evacuating two casing
Page 5
volumes was acceptable given that water evacuation and recovery in this well has been
difficult at best. While this well may be difficult to obtain a sample from, the QAP
accommodates such situations at Section 6.2.7.d)(vii) whereby the well must be
evacuated to dryness, the number of gallons evacuated must be recorded, and prior to
sampling (but after evacuation) the depth to groundwater must be recorded on the field
data worksheet. The sampling technicians failed to recognize these requirements for
wells with poor recovery and failed to conduct any purging and to record the
information required by Section 6.2.7.d)(vii) ofthe QAP. The root cause was failure to
recognize the requirements of Section 6.2.7.d)(vii) ofthe QAP.
b) Steps That Have Been Taken to Correct the Violation
The following steps have been taken to correct the violation:
i. Sampling technicians have been re-apprised ofthe requirements of Section
6.2.7.d)(vii) ofthe QAP.
ii. All technicians are required to read the QAP at least annually and as necessary in
order to follow the QAP requirements.
c) Date WJien Compliance Was or Will be Regained
Well TW4-14 will be sampled in accordance with Section 6.2.7.d)(vii) ofthe QAP for
the 4" Quarter, 2009 Chloroform sampling event.
d) Steps Taken to Prevent Reoccurrence ofthe Noncompliance
The steps described under item 2.b) above have been taken. "
3. (Repeat violation identified in the November 2009 NOV, Violation No. 3) Contrary to
Section 6.2.7(d)(v) of the DUSA QAP, DUSA failed to make and record multiple field
measurements to demonstrate parameter stability (+/- 10%) before water quality sample
collection in 21 monitoring wells for the 2"'' quarter 2009 chloroform monitoring event.
While the approved field worksheet included space for four (4) individual field parameter
measurements, in one case (TW4-14) none were recorded and in all others only one (1)
measurement was recorded. These wells along with the reported purge volume at the time
field parameters where measured are summarized in the table below.
Well
TW4-1
TW4-2
TW4-3
TW4-4
TW4-5
TW4-6
j TW4-7
TW4-8
TW4-9
TW4-10
Volume Purged (gallons)
60
66
66
66
84
36
66
76
84
72
Volume When Field
Parameters Where
Measured (gallons)
48
54
48
54
66
24
54
48
60
60
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TW4-11
TW4-12
TW4-13
TW4-14
TW4-16
TW4-18
TW4-21
TW4-22
TW4-23
TW4-24
TW4-25
48
78
72
Not Purged
96
102
84
78
73
86
127
36
54
54
72
90
72
60
60
72
96
Section 6.2.7(d)(v) requires in part that:
"Take measurements of field parameters (pH, specific conductance, temperature, redox
potential and turbidity) during well purging, using the Field Parameter Meter and
turbidity measuring instrument. These measurements will be recorded on the Field Data
Worksheet. Purging is completed after two casing volumes have been removed and the
field parameters pH, temperature, specific coriductance, redox potential (Eh) and turbidity
have stabilized to within 10% over at least two consecutive measurements. "
In the second paragraph in the first page of Appendix A of the QAP it states:
"Specifically, the mill will use the same sampling regimen for the Chloroform
Investigation that is utilized for groundwater sampling under its groundwater discharge
permit, as set forth in the attached groundwater discharge permit Quality Assurance Plan
(QAP), except as set forth below:" subsequent language in Appendix A has no exceptions
to the well purging requirements outlined in section 6.2.7(d)(v) of the QAP.
According to DUSA field data work sheets (found under Tab B) of the Report, with the
exception of TW4-14, although 2 casing volumes of water were purged from each well,
only one set of field parameter measurements were measured and recorded. The field
parameters were measured prior to completion of purging the required two casing volumes
(see Table 4 for the inspection form in Attachment 1). Therefore, because DUSA only
made one set of measurements or in the case of TW4-14 no measurements, they are unable
to demonstrate that the field parameters stabilized to within 10% over at least two
consecutive measurements.
In section 3.3.3(b) of the Report DUSA followed the procedure for corrective action as
outlined in section 10.2 ofthe QAP to resolve this violation. As stated above, this is a
repeat violation of the same problem identified in the November 10, 2009 NOV, Violation
No. 3. Stated below is DUSA response on how they will resolve this violation in their
December 14, 2009 letter. DRC feels it is also reasonable to accept DUSA response in the
Report [section 3.3.3(b)] and their response for Violation No. 3 (stated below) for this
repeat violation and no enforcement is recommended.
Page 7
DUSA December 14,2009 response to resolve violation 3 identifled in the November
2009 NOV
"a) Root Cause ofthe Noncompliance
The sampling technicians failed to fully understand the QAP requirement at Section
6.2.7.(d)(v) ofthe QAP. The technicians incorrectly believed that ifthe well yields 2
casing volumes (Section 6.2.7.(d)(vi) ofthe QAP) or if stable parameters are obtained
in accordance with Section 6.2.7.(d)(v) then a sample can be collected. The technicians
did not understand that regardless of the fact that 2 casing volumes have been
evacuated. Section 6.2.7.(d)(v) requires that field parameters must fall within 10%
prior to the collection of samples. As a result, the technicians evacuated 2 casing
volumes and only recorded one set of field parameters.
b) Steps That Have Been Taken to Correct the Violation
The following steps have been taken to correct the violation:
i. Sample technicians have been re-apprised ofthe requirements at Sections
.2.7.(d)(v) and 6.2.7.(d)(vi) ofthe QAP and advised as to the duel requirement that
2 casing volumes must be evacuated and that stable field parameters must be
observed prior to sampling.
ii. The QA Manager has initiated an early review process for field data worksheets
relative to well evacuation volumes and field parameters. This review step will
occur as soon as possible after sampling has occurred, and in time for re-sampling
should purging steps fail to comply with QAP requirements.
iii. As an element of quarterly reporting, the QA Manager has initiated a documented
review of quarterly samples for evacuation volume and field parameter stability,
which has been included in the 3 Quarter, 2009 Chloroform Monitoring Report,
iv. All technicians are required to read the QAP at least annually and as necessary in
order to follow the QAP requirements.
c) Date When Compliance Was or Will be Regained
Samples will be collected in accordance with Sections 6.2.7.(d)(v) and 6.2.7.(d)(vi) of
the QAP during the 4''' Quarter, 2009 event.
d) Steps Taken to Prevent Reoccurrence ofthe Noncompliance
The steps described under 3.b) above have been taken."
RECOMMEDATION
The chloride analytical result comparison between the DUSA sample for TW4-8 and its duplicate
sample TW4-70 had a relative percent difference (hereafter "RPD") > 20% in the 3"" Quarter 2009
monitoring event (see the table below and Table 2 in Attachment 1) and therefore is in non-
conformance with Section 9.1.4(a) of the QAP.
Parameter
Chloride (mg/L)
TW4-8
44
TW4-70 (Duplicate
sample of TW4-8)
26
RPD
51.4%
Section 9.1.4(a) of the QAP requires:
"a) Relative Percent Difference
RPDs will be calculated in comparisons of duplicate and original field sample results.
Non-conformance will exist when the RPD > 20%, unless the measured activities are
Page 8
less than 5 times the required detection limit (Standard Methods, 1998) (EPA Contract
Laboratory Program National Functional Guidelines for Inorganic Data Review,
February 1994, 9240.1-05-01,p.25).
No other information stated in the Report on how DUSA would comply with corrective action as
required in section 10.1(a) and 10.2 of the QAP. There is a discrepancy between the DRC
calculated RPD value of 51.4% (see table above and Table 2 of Attachment 1) and DUSA
reported RPD value 31.58% [see section 3.3.3(b) ofthe Report]. The DRC staff stands by their
calculation and is of the judgment that DUSA is error. Regardless, both RPD values > 20%.
Therefore, two problems are apparent: 1) DUSA error in the RPD calculation, and 2) excessively
high RPD value.
The DRC policy when dealing with RPD is as followed (see 1/10/08 DRC Letter, p.2 and 4):
1) When DUSA submits an original and duplicate sample to the DRC for reporting
purposes, the DRC will use the sample with the highest concentration submitted to
determine comphance.
2) Starting with the submittal of the 4"" Quarter, 2007 Groundwater Report, DUSA will
be required to provide documentation for each RPD calculation used during its review
of analytical reports in a spreadsheet to be included in each groundwater report
submitted to the DRC.
At this time there is no ground water quality standard for chloride. Also, the 44 mg/L value
reported appears to be within the range of chloride concentrations found in other DUSA wells that
are not effected by the chloroform contamination, e.g. MW-5 and MW-12 (see Attachment 4
below). Therefore, no enforcement action is recommended for the chloride analytical result
comparison between the sample for TW4-8 and its duplicate sample TW4-70 for an RPD > 20%
in the 3*^ Quarter 2009 monitoring event. Instead, a recommendation should be issued to
encourage improvement attention and corrective action to this type of quality assurance matter.
SUMMARY OF PARAMETERS EXCEEDING GROUNDWATER QUALITY
STANDARDS
Compliance monitoring parameters nitrate, nitrate + nitrite, chloroform, and methylene chloride
exceeded their respective GWQS in the 3'^'' quarter 2009 monitoring event. These parameters are
summarized in the table below (also see Table 1 of the inspection forms in Attachment 1).
,rd 3*^° Quarter 2009
Monitoring Parameter
(GWQS)
Nitrate -I- Nitrite (10 mg/L)
1 Chloroform (no 70 |ag/L)
Wells Exceeding GWQS
TW4-22 and TW4-25
MW-4, MW-26, TW4-1, TW4-2,
TW4-4, TW4-6, TW4-7, TW4-10,
'1W4-11, TW4-19, TW4-20, TW4-21,
Page 9
Methylene Chloride
(5 tag/L)
Carbon Tetrachloride (5 pg/L)
andTW4-22.
MW-26 and TW4-16
TW4-19 and TW4-20
Note: Wells in bold type MW-4, MW-26, TW4-19, and TW4-20 are pumping wells.
Nitrate + Nitrite (hereafter "Nitrate") - On January 4, 2010 DUSA submit a contamination
investigation report (hereafter "CI") for Nitrate exceeding GWQS at the mill site. This CI
is currentiy under review. Therefore, at this time, no additional action is recommended.
Chloroform - There is already a notice of violation and groundwater corrective action
order in place (Docket No. UGQ-20-01) for the DUSA wells exceeding the GWQS for
chloroform. Therefore, other than addition corrective action described below for the
location at well TW4-6, no additional corrective action is recommended.
Carbon Tetrachloride and Methvlene Chloride - the presence of both of these groundwater
contaminants on the DUSA site has been long known. Recent concentrations trends for
both are discussed below.
CARBON TETRACHLORIDE AND METHYLENE CHLORIDE EXCEEDING GWQS
Carbon Tetrachloride (hereafter "CTC") - In the S^'' quarter 2009 chloroform monitoring event
CTC exceeded its GWQS (5 pg/L) in TW4-19 (15 pg/L) and TW4-20 (8.4 pg/L) [see Table 1 for
the inspection forms in Attachment 1].
In TW4-I9 CTC first exceeded the GWQS in the 3"* quarter 2008 monitoring event. The
following three quarterly monitoring events (4'*" quarter 2008, l" and 2"^* quarter 2009) CTC
appeared to show a decreasing trend with the last two events below the GWQS. However, in the
in the 3'^'' quarter 2009 monitoring event CTC increased to a historic high for TW-19 with a
concentration of 15 pg/L. It appears that the CTC concentrations show an over all slightly
increasing trend (see Figure 1 below). In TW4-20 beginning with the 4"^ quarter 2006 monitoring
event 7 out of 11 monitoring events (4'^ quarter 2006 to 3^'' quarter 2009) CTC exceeded the
GWQS. The CTC concentrations ranged from 2.2 to 15 pg/L and may show an increase trend
(see Figure 2 below).
DRC staff believes at this time no further corrective action is needed for this problem, since: 1)
CTC is a common co-contaminant of chloroform, and 2) CTC, at this time, has only exceeded the
GWQS in pumping wells TW4-19 and TW4-20 where it is currently being remediated by
hydraulic capture by the pumping system. However, when the corrective action plan (hereafter
"CAP") for the chloroform contamination investigation is approved, CTC cleanup standards in
TW4-19 and TW4-20 will also need to be established at levels equal to or below their respective
GWQS.
Methvlene Chloride (hereafter "MC") - in the 3"^ Quarter, 2009 MC exceeded the GWQS (5
pg/L) in well pumping well MW-26 (30 pg/L). Historically exceedences have been seen in
monitoring well TW4-16 (see Table 1 for the inspection forms in Attachment 1).
Page 10
Beginning with the 1^' quarter 2007 monitoring event MC in MW-26 has exceeded the GWQS in
the last 11 consecutive monitoring events and may show an apparent increasing trend (see Figure
3, below). No additional corrective action is needed for well MW-26 since it is a pumping well
used for hydraulic capture of the chlorofonn contamination.
Beginning with the 3^'' quarter 2005 monitoring event MC in TW4-16 has exceeded the GWQS in
eight of the last seventeen monitoring events and may show a decreasing trend (see Figure 4,
below). This decreasing trend may indicate that pumping at well MW-26 is effective at MC
source removal. Its also important to note that: 1) downgradient well MW-32 has a historic non-
detectable (<1.0 pg/1) concentrations of MC, and 2) in 7 of the last 13 monitoring events MC
concentrations have been below the GWQS (5 pg/L) in TW4-16 with the last three monitoring
events below the detection limit (1.0 pg/1), at this time no corrective action for MC at this well
location is recommended.
ELEVATED CHLORIDE CONCENTRATIONS
Although there is no GWQS for chloride it appears that chloride concentrations highs appear to be
in concert with wells that have exceeded the GWQS for nitrate. In Attachment 4 there is a
chloride and nitrate isoconcentration map prepared by DRC staff. Chloride and nitrate data came
from the 1^' and 2"^* quarter 2009 monitoring events for both the chloroform contamination
investigation and Permit groundwater monitoring. The map shows one chloride 100 mg/L
isoconcentration line and one nitrate 10 mg/L (10 mg/L is the GWQS for nitrate). Outside the 100
mg/L chloride isoconcentration line chloride concentrations range between 7-68 mg/L. Inside
this isoconcentration line chloride concentrations are the highest at the facility ranging between
100 - 618 mg/L. Both the chloride and nitrate isoconcentration lines appear to represent plumes
that are in concert with each other. On December 1, 2009 a letter was sent to DUSA
recommending they address and explain the chloride high concentration in conjunction with the
nitrate contamination investigation (hereafter "CI") report that was due to be submitted to DRC on
January 4, 2010. This CI report was submitted by DUSA and is currently under review.
STATUS AND CONDITION OF THE CHLOROFORM PLUME
The Plume No Longer Bound to the South
Based on the chlorofonn concentration data in the monitor wells and DUSA chloroform
isoconcentration map (see Attachment 3), it appears that the chloroform plume is bound with
wells around the perimeter of the plume showing less than a 70 pg/L (GWQS) concentrations with
the exception to the south end of the plume at TW4-6. Since the 2"*^ quarter 2005 monitoring
event chloroform concentrations show an increasing trend in TW4-6 (see Figure 5 below).
Staring in the 1^' quarter 2009 monitoring event chloroform concentrations exceeded the GWQS
with a reported chloroform concentrations of 81pg/L. In the following 2"'' and 3'^'' 2009 quarter
monitoring events chloroform concentrations have continued to increase with concentrations of
120 and 280 pg/L respectively, (see Table 1 or the inspection forms in Attachment 1 and Figure 5
below). Based on DUSA chloroform isoconcentration map (see Attachment 3), and the 3'^'* quarter
2009 water levels and estimated capture zones white mesa site map (see Attachment 5) it appears
that the chloroform plume is being captured by the pumping system with the exception ofthe area
in the vicinity of wells TW4-4 and TW4-6. TW4-4 and TW4-6 are located approximately 400
Page 11
and 700 feet respectively down-gradient of pumping well MW-4 and in the 3"^ quarter 2009
monitoring even have reported chloroform concentrations of 2,000 and 280 pg/L respectively.
Therefore, corrective action is recommended at TW4-6 with the following:
1. To hydraulically capture the elevated chloroform concentration in the vicinity of wells
TW4-4 and TW4-6 by pumping TW4-6 and;
2. To bound the chloroform plume south of TW4-6 by installing a least one monitor well
down gradient of TW4-6 that will have a chloroform concentration below 70 pg/L.
3. Aquifer testing at TW4-4, TW4-6, and any new wells, and
4. Expand chloroform capture maps to include head data from all wells north and including
well MW-17 and piezometers P-5.
During a DRC / DUSA conference call on October 29, 2009, DUSA agreed that the recent
chloroform concentrations in well TW4-6 exceeded the 70 pg/1 GWQS, and that adjustment to the
hydraulic containment program was in order. Two options to improve hydraulic control and
containment were discussed: 1) increased pumping from the existing four (4) chloroform
pumping wells, and / or 2) addition of one or more pumping wells in or near well TW4-6.
On January 4, 2010 DUSA submit a plan of action and work schedule (hereafter "Plan") for DRC
review and approval. This Plan is currently under review.
Highest Chloroform Concentrations in the Plume
The highest chloroform concentrations within the plume appear to exist in the vicinity of two
locations (see DUSA chloroform isoconcentration map in Attachment 3): 1) at pumping wells
TW4-19 and TW4-20, and 2) pumping well MW-4. The chloroform concentration at TW4-19 and
TW4-20 is 6,600 and 13,000 pg/L, respectively. Chloroform concentrations for wells in the
vicinity of MW-4 range from 1,500 to 3,000 pg/L. At both these locations the pumping wells
appear to be capturing these high chlorofonn concentrations with the exception of possibility the
area, as described above, in the vicinity of TW4-4 (located approximately 400 feet down-gradient
of MW-4) that has a chloroform concentration of 2,000 pg/L. The distance between these two
locations is approximately 1,300 feet with wells that have chloroform concentrations ranging
between 910 to 1,000 pgA.. MW-4 appears to be, according to the 3"" quarter 2009 groundwater
contour map, cross-gradient to the southeast of TW4-19 and TW4-20 (see DUSA groundwater
contour map in Attachment 2) due to: 1) the hydraulic stress on the aquifer from pumping wells
MW-4, MW-26, TW4-19, and TW4-20 and, 2) the hydraulic groundwater mounding effect or
recharge on the aquifer from the leakage of the wild life ponds. Prior to these man-caused
influences, the aquifer near well MW-4 may have been more down-gradient of the MW-26, TW4-
19, and TW4-20 well locations, as seen the 1993 groundwater contour map provided by the report
by Peel Environmental Services (Peel 1993) [see Attachment 2].
Chloroform Contamination Source
Based on the 3"* quarter 2009 chloroform isoconcentration map (see Attachment 3) the chloroform
contamination source continues to appear to be the abandoned scale house leach field and former
office leach field.
Page 12
Based on the last 19 quarterly sampling events (since 1*' quarter 2005 to 3"* quarter 2009) the
chloroform isoconcentration maps show that it appears the basic shape and extent ofthe
chloroform plume has not changed and may be in a static condition with the exception ofthe
recent migration of the plume extending south beyond TW4-6.
Pase 12 •*&
References
Denison Mines (USA) Corp., June 2008, White Mesa Uranium Mill, Ground Water Monitoring
Quality Assurance Plan.
Denison Mines (USA) Corp., August 2009, White Mesa Uranium Mill Chloroform Monitoring
Report 2"'' Quarter (April through June 2009)
Denison Mines (USA) Corp., December 2009, White Mesa Uranium Mill Supplemental
Chloroform Monitoring Report Addendum 2"^* Quarter (April through June 2009)
Denison Mines (USA) Corp., December 14, 2009, Letter: DUSA 3"* Quarter, 2008, 4'" Quarter
2008 and 1^' Quarter 2009, Chloroform Monitoring Reports: Notice of Violation and Compliance,
Docket No. UGW09-04
Hydro Geo Chem, INC (HGC) August 29, 2002, Well Installation Report.
State of Utah Division of Water Quality Department of Environmental Quality, March 8, 2005,
Ground Water Discharge Permit for Denison Mines (USA) Corp. at the White Mesa Mill Facility
Near Blanding, Utah.
Utah Division of Radiation Control, August 23, 1999, White Mesa Uranium Mill: Notice of
Violation and Groundwater Corrective Action Order, Docket No. UGW20-01.
Utah Division of Radiation Control, January 28, 2009, White Mesa Uranium Mill: Stipulated
Consent Agreement, Docket No. UGW09-03.
Utah Division of Radiation Control, November 10, 2009, DUSA 3"* Quarter, 2008 (dated
November 2008), 4"" Quarter, 2008 (dated Febmary 2009), and 1'' Quarter, 2009 (dated May
2009) White Mesa Uranium Mill Chloroform Monitoring Reports: Notice of Violation and
Compliance Order, Docket No. UGW09-05.
Utah Division of Radiation Control, November 9, 2009, Editorial Corrections for Future
Chloroform Monitoring Reports for the Chloroform Contamination Investigation, Dennison Mines
(USA) Corp., White Mesa Uranium Mill, near Blanding, Utah
Utah Division of Radiation Control, December 1, 2009, Apparent Chloride Plume Coincident with
the Nitrate Plume at the White Mesa Uranium Mill Facility near Blanding Utah:
Recommendation.
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Attachment 1
Inspection Forms For
3"^" Quarter 2009
Utah Radiation Control Inspection Form
Chloroform Contamination Investigation
3'^'' Quarter 2009 Ground Water Monitoring Report
Denison Mines (USA) Corp.
White Mesa Uranium Mill, near Blanding, Utah
Regulatory Enforcement Documents:
• White Mesa Uranium Mill Ground Water Quality Assurance Plan (hereafter "QAP").
The QAP was originally dated November 17, 2006, (Revision 1.0); and was approved
by the DRC Executive Secretary on December 1, 2006. The DUSA QAP was revised
by DUSA on June 18, 2008 (Revision. 3.0) and was approved on June 20, 2008 by
the Executive Secretary. Later, the QAP was revised by DUSA in a submittal of
November 18, 2008 (Revision 4.0), and subsequentiy approved on March 30, 2009.
Changes in DUSA QAP Revision 4.0 were minor and do not alter any findings set out
below.
• Groundwater Discharge Permit No. UGW370004 (hereafter "Permit"). DUSA was
issued the Permit on March 8, 2005, last modified on March 17, 2008.
Date of Inspection/Report Review:
DRC Inspection Staff: Dean Henderson
Were Violations Recommended:
GROUNDWATER MONITORING REPORT
1. Was the 3'^'' quarter 2009 Groundwater Monitoring Report (hereafter "Report") received
by DRC on or before December 1, 2009 as required Part I.F.I of the Permit and section
11 of the QAP? No. The Report was received by DRC on December 2, 2009
Violation: No
2. Was the decontamination procedure for all sampling equipment follow the requirements
in section 6.2.5 of the QAP? No. According to section 2.2.1(b) of the report: "Before
leaving the Mill office, the pump and hose are rinsed with de-ionized ("DI") water. Mill
personnel then proceed to the first well which is the well indicating the lowest
concentration of chloroform based on the previous quarters sampling results. ". Based
on this statement it appears the pump used to purge the wells was only rinsed with de-
ionized water prior to purging activities and not decontaminated according to Part
I.E. 1(a) ofthe Permit and section 6.2.5 ofthe QAP. Also, in the last sentence in section
2.2.2(a) of the report states: "The dedicated portable pump is appropriately
decontaminated prior to each purging sampling event and the QA rinsate sample is
collected after said decontamination but prior to the commencement ofthe sampling
event. ". Based on this statement it is not clear weather the portable pump was
decontaminated by rinsing it with de-ionized water as described in section 2.2.1(b) ofthe
report or appropriately decontaminated prior to each purging sampling event following
decontamination procedures outiined in Part I.E. 1(a) ofthe Permit and section 6.2.5 of
the QAP.
Violation: Yes. Part I.E. 1(a) of the Permit and section 6.2.5 of the QAP
3. Were groundwater levels measured at the locations required in the section 6.1 of the
QAP? Yes
Violation: No.
Well
MW-1
MW-2
MW-3
MW-4
MW-5
MW-11
MW-12
MW-13
MW-14
MW-15
MW-17
MW-18
MW-20
MW-22
MW-23
MW-24
MW-25
MW-26
MW-27
MW-28
MW-29
MW-30
MW-31
MW-32
TW4-1
TW4-2
TW4-3
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No Well
TW4-4
TW4-5
TW4-6
TW4-7
TW4-8
TW4-9
TW4-10
TW4-11
TW4-12
TW4-13
TW4-14
TW4-16
TW4-18
TW4-19
TW4-20
TW4-21
TW4-22
TW4-23
TW4-24
TW4-25
P-4
P-5
P-3
P-4
P-5
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
4. Were there Field Data Work Sheets for each Monitoring Well have the information listed
Part I.F. 1(a) and in section 7.1 of the QAP? Yes (see table 5)
Violation: No
5. Where purging procedures followed as required in section 6.2.7 of the QAP (see table 4)?
No. Violation: Yes.
There where one set of field parameters recorded and parameters were measured prior
to purging the required'two casing volumes (see Table 4) in the following wells:
TW4-1, TW4-2, TW4-3, TW4-4, TW4-5, TW4-6, TW4-7, TW4-8, TW4-9, TW4-10,
TW4-11, TW4-12, TW4-13, TW4-14, TW4-16, TW4-18, TW4-21, TW4-22, TW4-
23, TW4-24, and TW4-25. Therefore, there was a failure to show that the field
parameters were not within 10% to two consecutive measurement prior to sampling
as outlined in section 6.2.7(d)(v) of the QAP.
TW4-14 was sampled but according to the field data work sheet the well was not
purged. According to the field data work sheet stated ''there was not enough water to
purge ". Tab G of the Report records that the water level below ground surface is
87.45 feet. And according to the well completion details for TW4-14 the well depth
is 92.S feet bis (HGC 2002). Therefore, there was approximately 5 feet of water in
the well column which qualifies TW4-14 to follow the purging procedures with a
bailer as out lined in section 6.2.7(e) of the QAP.
Were water quality QC samples collected as required in section 4.3 ofthe QAP (see the
table below and Table 2)? Yes. Violation: No
Sample
Duplicate for each batch
of 20 samples.
Trip Blank for each
cooler shipped with VOC
samples.
Equipment Blank for
sampling equipment in
contact with the
groundwater (Pumps,
bailers etc).
Yes/ No
yes
yes
yes
Violation
no
no
no
Comments
TW4-65 a duplicate of MW-32
(fonner TW4-17)
TW4-70 a duplicate of TW4-8
One equipment blank identified as
TW4-63
Were all the required compliance monitoring parameters analyzed for
monitor well as required in section 4 of the Appendix A of the QAP?
Violation: No.
each compliance
Yes.
Sample ED
MW-4
MW-26
MW-32
TW4-1
TW4-2
TW4-3
TW4-4
TW4-5
TW4-6
TW4-7
TW4-8
TW4-9
TW4-10
TW4-11
TW4-12
TW4-13
TW4-14
TW4-16
TW4-18
TW4-19
TW4-20
Parameters with their GWQS
"^Nitrate
10 mg/L
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
Chloroform
70 Mg/L
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
Carbon
tetrachloride
5 pg/L
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
Chloromethane
30|igA.
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
Methylene
chloride
5 pg/L
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
Chloride
No
GWQS
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
TW4-21
TW4-22
TW4-23
TW4-24
TW4-25
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
1. Nitrate -i- Nitrite as N
8. Were all groundwater quality analyses performed with a minimum detection limit or
reporting limit less then its respective GWQS (See Table 1)?: Yes
Violation: No
9. Did samples arrive at the contracted laboratory below 6^0 as required in section 6.2.12(e)
of the QAP? Yes. According to the chain of custody document provided in Energy
Laboratories analytical summary report that is provided in Attachment H the Report,
samples arrived at a 3°C. Violation: Nq
10. Were the compliance monitoring parameters analyzed by excepted EPA analytical
methods as required in Table 1 in section 8.2 of the QAP? Yes (see table below).
Violation: No
Sample ID
MW-4
MW-26
MW-32
TW4-1
TW4-2
TW4-3
TW4-4
TW4-5
TW4-6
TW4-7
TW4-8
TW4-9
TW4-10
TW4-11
TW4-12
TW4-13
TW4-14
TW4-16
TW4-18
TW4-19
TW4-20
TW4-21
TW4-22
TW4-23
Parameters with their Analytical Methods
^''Nitrate
E353.2
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Chloroform
SW8260B
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Carbon
tetrachloride
SW8260B
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Chloromethane
SW8260B
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Methylene
chloride
SW8260B
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Chloride
A4500-
CL
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
TW4-24
TW4-25
TW4-60
TW4-63
TW4-65
TW4-70
TW4-73
*Trip Blank
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
* VOC only
11. Were the compliance monitoring parameters within maximum holding times as required
in Table 1 in section 8.2 of the QAP? Yes. Violation: No
Sample ID
MW-4
MW-26
MW-32
TW4-1
TW4-2
TW4-3
TW4-4
TW4-5
TW4-6
TW4-7
TW4-8
TW4-9
TW4-10
TW4-11
TW4-12
TW4-13
TW4-14
TW4-16
TW4-18
TW4-19
TW4-20
TW4-21
TW4-22
TW4-23
TW4-24
TW4-25
TW4-60
TW4-63
TW4-65
TW4-70
*Trip Blank
Parameters with their holding times
^'^Nitrate
28 days
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Chloroform
14 days
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Carbon
tetrachloride
14 days
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Chloromethane
14 days
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Methylene
chloride
14 days
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Chloride
14 days
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
12. Did any of the compliance monitoring parameters exceed groundwater quality standards
(GWQS) [See Table 1]? Yes.
Nitrate. Nitrate + Nitrite: TW4-22, TW4-24, and TW4-25
Chlorofonn: MW-4, MW-26, TW4-1, TW4-2, TW4-4, TW4-6, TW4-7, TW4-10, TW4-
11, TW4-19, TW4-20, TW4-21, andTW4-22.
Methvlene Chloride: MW-26
Violation: Yes
13. Were QA/QC objectives meet precision, accuracy, representativeness, completeness, and
comparability requirements in section 3 and 9 [for relative percent difference (hereafter
"RPD")] for ofthe QAP? No. See Details below.
Violation: Yes.
Fails precision, representativeness, completeness requirements in section 3.0 ofthe
QAP.
Precision (see Table 2): Duplicate sample for MW-32 (TW4-65) was within the 20%
RPD (12.9 %). The duplicate sample for TW4-8 (TW4-70) was outside the RPD
(51.4%). Therefore the data set fails the precision guidelines.
Representativeness (see Table 2): Duplicate sample for MW-32 (TW4-65) was
within the 20% relative percent difference (12.9 %) [hereafter "RPD"]. The duplicate
sample for TW4-8 (TW4-70) was outside the RPD (51.4%). Therefore the data set
fails the representative guidelines.
Completeness: Is based on precision (see comment above), accuracy (see comment
below), and holding time evaluation. Based on these criteria the data set fails
precision, and passes accuracy and the holding time for the data set is in compliance.
Because the data set fails the precision guide lines, completeness fails the 100%
criteria.
Accuracv: Based on the QA/QC laboratory report the percent recovery for analyte
samples are within expectable recovery ranges for accuracy.
Comparability: Is based on sampling conditions, collection techniques, measurement,
procedures, methods, and reporting units. After review of the data and report it
appears that the comparability requirements were meet.
The DRC policy when dealing with RPD is as followed (see 1/10/08 DRC Letter, p.2
and 4):
1) When DUSA submits an original and duplicate sample to the DRC for reporting
purposes, the DRC will use the sample with the highest concentration submitted
to determine compliance.
2) Starting with the submittal of the 4'^ Quarter, 2007 Groundwater Report, DUSA
will be required to provide documentation for each RPD calculation used during
its review of analytical reports in a spreadsheet to be included in each
groundwater report submitted to the DRC.
At this time there is no ground water quality standard for chloride. Therefore, no
enforcement action is recommended for the chloride analytical result comparison
between the sample for TW4-8 and its duplicate sample TW4-70 for an RPD > 20%
in the 3'^'' Quarter 2009 monitoring event.
14. Were the samples collected starting from least contaminated to most contaminated as
required in section 1 of Appendix A of the QAP (see Table 3)? Yes
Violation: No.
15. Was analyses preformed by a State of Utah Certified Heath Laboratory as required in
section 2.5 ofthe QAP? Yes. Laboratory: Energy Laboratories, Certificate
N0.WYOOOO2.
Violation: No
16. Did the Report include all reporting requirements as required in section 6 of Appendix A
of the QAP? Yes.
Violation: No
References
Denison Mines (USA) Corp., June 2008, White Mesa Uranium Mill, Ground Water
Monitoring Quality Assurance Plan.
Denison Mines (USA) Corp., August 2009, White Mesa Uranium Mill Chloroform
Monitoring Report 2nd Quarter (April through June 2009)
Denison Mines (USA) Corp., December 2009, White Mesa Uranium Mill Supplemental
Chloroform Monitoring Report Addendum (April through June 2009)
State of Utah Division of Water Quahty Department of Environmental Quality, March 8,
2005, Ground Water Discharge Permit for Denison Mines (USA) Corp. at the White Mesa
Mill Facility Near Blanding, Utah.
TABLE 1
HISTORIC SUMMARY OF MONITORING PARAMETERS UP TO THE 3rd QUARTER 2009
CHLOROFORM CONTAMINATION INVESTIGATION
DUSA WHITE MESA MILL
NA = not analyzed
NS = not sampled
Shaded indicates concentrations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
1st Qtr = January - March
2nd QU = April - June
3rd Qtr = July - September
4th Qtr = October - Decemtrer
Well
Sampling Event
MW-4
1st Otr 3/16/05
2nd Qtr 6/25/05
3rd Qtr 8/31/05
4m Qtr 12/7/05
1st Qtr 3^9/06
2nd Qtr 6/14/06
3rd Otr 7/20/06
4lhQtr1i;e/06
1st Qtr 2/28/07
2nd Qtr 6/27/07
3rd Qtr 8/15/07
4th Qtr 10/10/07
1st Otr 3/28/08
2nd Qtr 6/25/08
3rd Qtr 9/1 a08
4th Qtr 10/15/08
1st Otr 3/4/09
2nd Qtr 6/23/09
3rd Otr 9/14/09
MW-4A(TW4-A)
1st Qtr 3/16/05
2nd Qtr 5/25/05
3rd Qtr 8/31/05
4th Qtr 12/7/05
1st Qtr 3/9/06
2nd Qtr 6/14/06
3rd Qtr 7/20/05
4th Qtr 11/8/05
1st Qtr 2/28/07
Carbon Tetraclilorlde
(5 (ig/U)
NA
NA
<10
<50
<S0
<S0
<S0
NA
NA
<10
<so
<50
<S0
<S0
MW-26 (former TW4-15)
1st Qtr 3/16/05
2nd Qtr 5/25/05
3rd Qtr 8/31/05
4th Qtr 12/7/05
1st Qtr 3/9/06
2nd Qtr 6/14/06
3rd Qtr 7/20/06
4th Qtr 11/8/06
1st Qtr 2/28/07
2ndQlr6B7/07
3rd Qtr a/15/07
4th Qtr 10/10/07
1st Qtr 3/28/08
2nd Qtr 5/25/08
3rd Qtr 9/10/08
4th Qtr 10/15/08
4th Qtr 11/18/09
1slOtr3'4/09
2nd Qtr 6/23/09
3rd Qtr 9/14/09
NA
NA
<5.0
<S0
<50
<S0
<S0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1 0
NA
<2.0
<1.0
<1.0
<1.0
MW-32 (former TW4-17)
1st Qtr 3/16/05
2nd Qtr 5/25/05
3rd Qtr 8/31/05
41h Qtr 12/7/05
1st Qtr 3/9/06
2nd Qtr 6/14/06
3rd Qtr 7/20/05
4th Qtr 11/8/06
lsl Otr 2/28/07
2nd Qtr 6/27/07
3rd Qtr 8/15/07
4lh Qtr 10/10/07
1st Otr 3/28/08
2nd Qtr 6/25/08
3rd Qtr 9/10/08
4thQtr10/1V08
1st Qtr 3/4/09
2nd Qtr 5/23/09
3rd Qtr 9/14/09
NA
NA
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
2.1
1.6
1.8
19
1.7
1.7
1.8
1.8
1 7
15
1.3
1.4
2.4
1.9
Parameter
GWOS
Chloride
(m q/L)
^4oGWQS
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
53
49
49
48
50
47
45
47
45
42
42
35
45
37
34
43
55
53
54
54
54
60
Cfiloroform
(70 pg/L)
: 2.900
• 3,170
.:-. 3,500
3,000
K- 3,100
. 3.000
2,820
. 2,830
: 2.300
wV 2,000
2.600
•• 2,300
.-• .2,400
2,500
. 1;800
2,100
-- =2,200
,,..1,800
2,000
3,700
*-'3,740
,3,800
• 3,000
.: 3,700
3,300
•V. 3,190
3,370
• " 2,500
Cfiloromethane
(30 pg/L)
NA
NA
<10
<so <so <so <so
1.4
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
NA
NA
<10
<so
<so <so <so
<i.b
<1.0
Metiiylene Chloride
NA
NA
<J0
<so <so <so
<50
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
NA
NA
<ro
<so
<so <so <50
<1.0
<1.0
Well abandonded
55
52
52
65
54
56
49
57
57
49
57
44
64
49
48
46
33
32
30
32
31
32
32
31
32
31
29
30
26
M
31
33
;4i •'SIO
. 442
-- ?g6b
, 1,000
1,100
i. •:• 830
2,170
' •!'282
; 570
300
J-.. 41,400
2,000
•-.. * 930
. .1,300
' "' 630
NA
1,700
f -. 950
,410
' ""850
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1 0
<1.0
<1.0
<1.0
<1.Q
<1.0
<1.0
<1.0
<1.0
NA
NA
5.4
<so
<so <so <so
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
<1.0
NA
^2.0
<1.0
<1.0
<i6
NA
NA
3.2
<1 0
<1.0
3.5
1.8
1.5
^1.0
<1.0
ii.o
.:1.0
<1.0
il.O
<1.0
ii.o
ii.o
<1.0
<1.0
NA
NA
<5.0
<so
<so <so
<rSO
^•
;•,
•*.:
'^.' NA
*•
•!'
NA
NA
i1.0
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ito
ii.o
ii.o
ii.o
ii.o
(5 pg/L)
Nitrate, Nitrate +
(10 mg/L)
2.6
...... -5.5
•••13
r. +1. - 36
14
»• -? ;»:• 40
, 63
24
100
•-.•. ' • 51
. ; 12
<- r, -=: 30
NA
iOI
i0.1
iO.1
iOI
iOI
iOI
ii.o
i.l
ii.o
ii.o
ii.o
i1.0
i 1
ii.o
<1.0
i0.05
i.l
iOI
iOI
Nitrite
6.3
7.1
7.0
7.0
6.0
6.0
1.2
6.d
6.3
7.0
62
62
5.8
6.1
5.4
5.9
5.7
5.2
5.3
7.1
7.8
6.9
6.7
5.8
7.3
1.2
7.1
7 1
03
0.2
02
03
02
0.2
1.4
03
05
0.4
1
0.6
Ol
05
02
01
04
02
01
TABLE 1
HISTORIC SUMMARY OF MONITORING PARAMETERS UP TO THE 3rd QUARTER 2009
CHLOROFORM CONTAMINATION INVESTIGATION
DUSA WHITE MESA MILL
NA = not analyzed
NS = not sampled
Shaded indicates concentrations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
1 sl Qtr = January - March
2nd Otr = April - June
3rd Qtr = July - September
4th Qtr = October - December
Well
Sannpling Event
rw4-i
1st otr 3/16/05
2nd Qtr 5/25/05
3rd Qtr 8/31/05
4th Otr 12/7/05
1st Otr 3/9/05
2nd Qtr 6/14/06
3rd Qtr 7/20/05
4th Qtr 11/8/06
1st Otr 2/28/07
2nd Qtr 6/27/07
3rd Qtr a/15/07
4th Otr 10/10/07
1st Otr 3/28/08
2nd Qtr 5/25/08
3rd Qtr 9/10/08
4th Qir 10/15/08
1st Qtr 3/11/09
2nd Qtr 6/23/09
3rd Qtr 9/14/09
TW4-2
1st Qtr 3/16/05
2nd Otr 5/25/05
3rd Qtr 8/31/05
4th Qtr 12/7/05
1st Otr 3/9/06
2nd Qtr 6/14/06
3rd Qtr 7/20/06
4th Otr 11/8/06
1st Qtr 2/28/07
2nd Qtr 5/27/07
3rd Qtr a/15/07
4th Qtr 10/10/07
1st Qir 3/28/08
2nd Qtr 6/25/08
3rd Qtr 9/10/08
4th Qtr 10/15/08
4th Qtr 11/18/09
1st Qtr 3/11/09
2nd Otr 6/23/09
3rd Otr 9/14/09
TW4-3
lsl Qtr 3/16/05
2nd Otr 5/25/05
3rd Otr a/31/05
4th Qtr 12/7/05
1st Qtr 3/9/06
2nd Otr 6/14/06
3rd Otr 7/20/06
4th Qtr 11/8/06
1st Qtr 2/28/07
2nd Otr 6/27/07
3rd Otr 8/15/07
4th Otr 10/10/07
1st Qtr 3/28/08
2nd Qtr 6/25/08
3rd Qtr 9/10/08
4th Otr 10/15/08
1st Otr 3/4/09
2nd Qtr 5/23/09
3rd Qtr 9/14/09
TW4-4
1st Otr 3/16/05
2nd Qir 5/25/05
3rd Qtr 8/31/05
4th Qtr •12/7/05
1st Otr 3/9/06
2nd Qtr 6/14/06
3rd Qtr 7/20/06
4th Qtr 11/8/06
1st Qtr 2/28/07
2nd Otr 6/27/07
3rd Otr a/15/07
4th Qtr 10/10/07
1st Qtr 3/28/08
2nd Otr 5/25/08
3rd Qtr 9/10/08
4th Otr 10/15/08
4th Otr 11/18/09
1st Otr 3/4/09
2nd Qtr 6/23/09
3rd Qtr 9/14/09
Parameter
GWQS
Carbon Tetrachloride
(5 pg/L)
NA
NA
<10
<so
<so
<so
<so
ii.o
NA
NA
<10
<so
<so
<so
<so
NA
NA
NA
ii.o
il 0
ii.o
ilO
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
NA
NA
<10
<sb
<so <so <so
NA
<2.0
1.4
1 2
1 4
1.3
1.3
1.3
1.1
1.3
1.3
1.1
1
2.3
1.8
2.5
2.2
2.1
2.3
2.2
2.4
2.4
2.2
2
2
1.7
1.5
1.7
1.5
1.5
1.6
1 5
1.4
1.2
1.2
1.1
Chloride
(mg/L)
No GWQS
NA
NA
NA
52
49
48
51
47
47
45
43
43
39
39
35
41
37
37
36
NA
NA
NA
56
56
56
54
55
54
50
49
51
48
46
42
47
NA
46
44
43
NA
NA
NA
25
26
25
25
23
22
23
24
27
21
19
19
22
21
20
21
NA
NA
NA
54
51
48
50
49
49
47
45
47
43
42
39
44
NA
37
34
39
Chloroform
(70 pg/L)
2,700
3.080
,.;-:-, 2,900
••-^•2,400
2,700
.: 2,200
i.::2.840
*i*12,266
i;900
1,900
•:.'-. -2,300
% 2.000
2,000
••:• 1,900
• v. ,1,700
••'.fc'fi-,7b6
•••. 1,700
1,500
.:.!•;• 1,700
3.700
3,750
,..1-, 3,900
^;# 3,500
. . 3,800
, 3,200
4,120
*S£;' 3,420
2,300
3,000
340
'^-:. 3,200
3,300
3,100
. 2,800
NA
3.200
3,100
2,800
?i: 3,000
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
<1.0
ii.o
ii.o
ii.o
ii.o
ii.o
i1 0
3.100
2.400
*:, 3,200
••'. -2,800
2,900
2,600
.^.:.. 2,860
•-?.••: 2,670
2,200
2,400
ijf. 2,700
-s 2,500
2.800
2,500
iii. 2,200
NA
2,500
2,200
-.•., 1,800
'•• 2,000
Chloromethane
(30 pg/L)
NA
NA
ilO
<50
<S0
<50
<S0
ii.o
i1.0
i1.0
ii.o
ii.o
ii.o
i1.0
ii.o
ii.o
ii.o
i1.0
ii.o
NA
NA
iio
<so
<so
<so
<so
ii.o
ii.o
ii.o
ii.o
ii.o
ii.6
i1.0
ii.o
NA
i2.0
ii.o
ii.o
ii.o
NA
NA
64
ii.o
2.3
1.6
2.2
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
il 0
ii.o
ii.o
ii.o
NA
NA
iio
<so <so
<50
<50
ii.o
ii.o
ii.o
ii.o
ii.o
il 0
ii.o
ii.o
NA
i2 0
ii.o
ii.o
ii.o
Methylene Chloride
(5 pg/L)
NA
NA
<W
<50
<S0
<S0
<S0
ii.o
i1.0
i1.0
i1.0
ii.o
ii.o
ii.o
ii.o
ii.b
ii.o
ii.o
ii.o
NA
NA
<10
<so
<so
<50
<S0
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
NA
i2.0
i1.0
ii.o
ii.o
NA
NA
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
iio
ii.o
NA
NA
<70
<s6
<50
<S0
<S0
ii.o
ii.o
ii.o
ii.o
ii.o
i1.0
il 0
ii.o
NA
i2.0
ii.o
ii.o
ii.o
Nitrate, Nitrate -i. Nitrite
(10 mg/L)
91
106
98
97
94
96
9.2
89
9
84
7.8
75
8.68
8.15
9.3
7.5
6.9
7;
77
8.5
8.0
7.8
7.5
71
74
7.5
73
7.8
7.3
69
6.9
74
7.1
80
NA
55
6.4
66
35
37
3.5
33
33
7.1
29
1.5
31
33
31
2.8
2.8
29
2.7
2.6
2.5
2.9
2.8
IOO
11.3
9.9
.«•«• -.- • '~%..-' 10:2
9.5
86
9.7
V-- r, .SieV 10:1
9.0
94
95
9.5
9.2
108
88
'•!!•: -:r- -io-.i
NA
102
82
8.4
TABLE 1
HISTORIC SUMMARY OF MONITORING PARAMETERS UP TO THE 3rd QUARTER 2009
CHLOROFORM CONTAMINATION INVESTIGATION
DUSA WHITE MESA MILL
Well
Sampling Event
TW4-5
1st Qtr 3/16/05
2nd Qtr 5/25/05
3rd Qtr 8/31/05
UthOlr 12i/7/05
Isi Qir 3/9/05
2nd Qtr 6/14/06
3rd Qtr 7/20/06
4th Qtr 11/8/05
1st Qtr 2/28/07
2nd Qtr 6/27/07
3rd Qir B/15/07
4th Qtr 10/10/07
1st Qtr 3/28/08
2nd Qtr 6/25/08
3rdQtr9/1Q/08
4th Qtr 16/15/08
1st Qtr 3/4/09
2nd Qtr 6/23/09
3rd Qtr 9/14/09
TW4-6
1st Qtr 3/16/05
2nd Qtr 5/25/05
3rd Qtr 8/31/05
4ihQlr12r//05
1st Qtr 3/9/06
2nd Qtr 6/14/06
3rd Qtr 7/20/06
Ulh Qtr 11/8/05
1st Qtr 2/28/07
2nd Qtr 6/27/07
3rd Qtr 8/15/07
4lh Qtr 10/10/07
1st Qtr 3/28/08
2nd Qtr 6/25/08
3rd Qtr 9/10/08
4lh Qtr 10/15/08
•isi Otr 3/11/09
2nd Qtr 6/23/09
3rd Qtr 9/14/09
ffW4-7
lsl Qtr 3/16/05
2nd Qtr 5/25/05
3rd Qtr 8/31/05
4th Otr 12/7/05
Isi Qtr 3/9/06
2nd Qtr 6/14/06
3rd Qtr 7/20/05
4th Qtr 11/8/06
1st Otr 2/28/07
2nd Qtr 6/27/07
3rd Qtr 8/15/07
4th Qtr 10/10/07
isi Qtr 3/28/08
2nd Otr 6/25/08
3rd Otr 9/10/08
4th Qtr 10/15/08
4th Qtr 11/18/09
isl Qtr i3/l 1/09
2nd Otr 6/23/09
3rd Qtr 9/14/(39
TW4-8
1st Qtr 3/16/05
2nd Qtr 5/25/05
3rd Qtr 8/31/05
4th Otr 12/7/05
1st Otr 3/9/06
2nd Qtr 6/14/06
3rd Qtr 7/20/06
4th Otr 11/8/06
1st Qtr 2/28/07
2nd Qtr 6/27/07
3rd Qtr 8/15/07
4th Qtr 10/10/07
1st Qtr 3/28/08
2nd oir 6/25/08
3rd Qtr 9/10/08
4lh Qtr io/15/08
1st Qtr 3/4/09
2nd Otr 6/23/09
|3rd Qtr 9/14/09
Carbon Tetrachloride
(5 pg/L)
NA
NA
i2.5
i2.5
i2:5
i2.5
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii:o
ii.o
ii.o
iib
ii.b
i1.0
ii.b
NA •
NA
ii.o
ivb
ii.o
i1.0
ii.o
ii.o
i1.0
ii.o
i1.0
ii.o
i1.0
ii.o
ii.b
i1.0
ii:b
ii.o
ii.b
NA
NA
<io
<sb
<50
<so
<so
1.5
1.1
1.5
1.4
i.2
i.3
1.3
1.4
NA
i2.b
1.2
ii.o
1
NA
NA
ii.o
i1.0
ii.o
ii.b
ii.o
ii.b
ii.o
ii.o
ii.o
ii.o
ii.b
il .0
ii.o
ii.b
ii.o
ii.o
il 0
Chloride
(mg/L)
No GWOS
NA
NA
NA
55
52
51
54
55
57
45
38
39
35
37
34
37
34
37
48
NA
NA
NA
32
31
30
37
55
32
38
36
35
33
35
35
33
35
37
37
NA
NA
NA
52
48
47
51
49
47
45
44
45
43
43
35
40
NA
35
37
37
NA
NA
NA
41
39
37
39
40
39
42
42
43
45
45
39
44
42
44
44
GWQS
Chloroform
(70 pg/L)
' •.-.•
ii.b
-.•
iV
•^'''
..':'
•:•••.•
N/^
• •^
ii.o
ii.b
ii.o
il 0
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
"/120
113
82
63
55
51
53.7
47 1
35
25
9.2
9.4
11
93
11
10
12
13
12
2.5
10
17
31
19
11
42.8
46
11
18
18
52
24
39
37
• 81
fcl 20
280
.3,100
2,700
3,100
2:500
i.bbb
2,200
2,140
'2,166
1,830
2,500
2,300
1:900
2.260
1,800
1.500
2,500
1,806
1,400
1,500
10
1.1
1.3
1 8
25
2.5
1.5
3.5
Chloromethane
(30 pg/L)
SlA
NA
5.8
2.5
3.1
31
ii.o
il.6
ii.b
il 0
ii.o
ii.o
ilO
ii.o
il 0
ii.o
il.6
ii.o
ii.o
NA
NA
2.8
1.3
ii.o
ii.o
ii.o
ii.o
il.6
ii.o
ii.o
ii.o
ii.o
ii.o
ii.b
ii.o
ii.b' "
ii.o
ii.o
NA
NA
iio
<so
<sd
<so
<so
iio
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
iio
NA
i2.0
ii.o
ii.o
ii.o
NA
NA
1.7
ii.o
2.1
1.0
ii.o
ii.o
ii.b
ii.o
ii.o
i1.0
ii.o •
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
Methylene Chloride
(5 pg/L)
r^A
NA
i2.5
i2.5
i2.5
i2.5
ii.o
ii.o
ii.o
il .0
il.6
ii.o
ii.b
ii.o
ii.o
ii:o
ii.o
ii.o
ii.o
NA
NA
ii.o
i1.0
ii.b
ii.o
ii.o
ii.b
ii.'b
ii.o
ii.o
il.6
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
NA
NA
<to
<so
<5d
<so
<so
iV.o
i1.0
ii.o
ii.o
ii.o
ii.b
ii.o
ii.o
NA
i2.0
ii.o
ii.o
ii.o
NA
N/^
NA
ii.o
ii.o
ii.o
ii.o
il .0
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
iio
il 0
ii.o
1 1 Nitrate, Nitrate -f Nitrite |
NA
iOI
ii.o
ilO
il 0
i.l
ii.o
ii.o
iboe
iO.05
iOI
iOI
iOl
(10 mg/L)
4.9
3.7
6.0
6.0
6.0
59
57
2.9
78
70
7.7
82
7.4
8.7
7.9
9:3
7.9
75
8.3
0.2
04
08
0.9
1.2
1.0
06
i'.4
1.8
06
0:7
od 1.1
09
1.1
i:o
2.2
2.7
5.0
5.2
5.4
5.2
5.3
1
4.5
4.7
4.6
6
5.1
4.7
4.7
4.2
4.8
4.16
• 4.01
3.7
3.8
4.1
02
03
01
07
02
05
01
NA = not analyzed
NS = not sampled
Shaded indicates cont:enirations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
1 st Qtr = January - March
2nd Qtr = April - June
3rd Qtr = July - September
4th Qir = October - December
TABLE 1
HISTORIC SUMMARY OF MONITORING PARAMETERS UP TO THE 3rd QUARTER 2009
CHLOROFORM CONTAMINATION INVESTIGATION
DUSA WHITE MESA MILL
Well
Sampling Event
TW4-9
1st Otr 3/16/05
2nd Otr 5/25/05
3rd Otr 8/31/05
4th Qtr 12/7/05
1st Qtr 3/9/05
2ndQtr6/14/b6
3rd Otr 7/20/06
4th Qtr 11/8/05
lsl Qtr 2/28/07
2nd Qtr 6/27/07
3rd oir 8/15/07
4th Qtr 10/10/07
1st Qtr 3/28/08
2nd Qtr 6/25/08
3rd Qtr 9/10/08
4th Qtr 10/15/08
1st Otr 3/4/09
2nd Qtr 5/23/09
3rd Qtr 9/14/69
TW4-10
1st oir 3/16/05
2nd Qtr 5/25/05
3rd Qtr 8/31/05
4th Qtr 12/7/05
1st Qtr 3/9/06
2nd Qtr 5/14/06
3rd Qtr 7/20/06
4thQtr11/a/b6
ist Qtr 2/28/07
2nd Otr 6/27/07
3rd Qtr 8/15/07
4th Qtr 10/10/07
1st Qtr 3/28/08
2nd Qtr 6/25/08
3rd Qtr 9/10/08
4th Qtr 10/15/08
4th Otr 11/18/09
Isi Qtr 3/11/69
2nd Qtr 6/23/09
3rd Qtr 9/14/09
TW4-11
ist Qtr 3/16/05
2nd Qtr 5/25/05
3rd Qtr 8/31/05
4th Qtr 12/7/05
1st Qtr 3/9/06
2nd Qtr 5/14/05
3rd Qtr 7/20/06
4th Otr 11/8/06
1st Qtr 2/28/07
2nd Qtr 5/27/07
3rd Qtr 8/i 5/67
4th Qtr 10/16/07
1st Qtr 3/28/08
2nd Qtr 5/25/08
3rd Qtr 9/10/08
4th Qtr 10/15/08
4th Qtr 11/18/09
lsl Qtr 3/11/09
2nd Qtr 5/23/09
3rd Otr 9/14/09
TW4-12
1stQtr3/ia'05
2nd Qtr 5/25/05
3rd Qtr 8/31/05
ilh Qtr 12/7/05
1st Qtr 3/9/06
2nd Qtr 5/14/06
3rd Qir 7/20/66
4th Qtr 11/8/06
IstCltr 2/28/07
2nd Qtr 6/27/07
3rd Otr 8/15/07
4th Qtr 10/10/07
1st Qtr 3/28/08
2nd Otr 6/25/08
3rdOlr9/lb/08
4th Qtr 10/15/08
1st Otr 3/11/09
2nd Qtr 6/23/09
3rd Qtr 9/14/09
Carbon Tetrachloride
(5 pg/L)
NA •
NA
ii.o
il 0
ii.o
il.6
ilO
ii.o
ii.6
il.6
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.b
ii.o
ii.o
NA
NA
i2.5
i2.5
iS.b
i5.b
iS.O
ii.o
ii.b
ii.o
ii.o
ii.o
ii.b
il 0
il'O
NA
i2.0
ii.o
il.6
il 0
NA
NA
<J0
<ioo
<so <so
<50
1.7
1.3
1.6
1.7
1.6
i1.0
ii.o
ii.o
NA
i2.0
ii.o .
ii.o
ii.b
NA
NA
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
il.0 • • • •
ii.o
ii.o
i1.0
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
Parameter
GWQS
Chloride
(mg/L)
No GWQS
NA
NA
NA
42
38
39
41
44
44
42
38
40
35
35
28
58
30
3b
X
NA
NA
NA
52
5b
54
61
58
2
54
59
59
55
58
51
61
i^A
54
52
51
N A
NA
NA
58
56
56
55
55
54
53
53
53
63
46
42
47
NA
49
44
49
NA
NA
NA
19
19
16
16
16
16
18
29
16
16
19
ia
22
23
22
22
Chloroform
(70 pg/L)
38
1.2
i1.0
ii.o
ii.b
19
il 0
ii.o
ii.o
21
9.5
87
1.3
1
ii.o
ii.o
il .0
ii.o
ii.o
140
62.4
h -,. 110
• 300
' ' '•' 190
«. ~, 300
, .. 504
• • 452
'"'.' -•:' 500
.. .. 350
. 560
•*' •' 470
:.. .=. =620
,, - -.720
' ' -^650
NA
. 1,200
. 1,100
•V *--i;2bo
£ .*. ,910
''' 4:400
* » 3,590
, :, 4:400
•. "• 4,400
s- •' 4,400
. .. 4,300
. 4,680
' ••3:660
; , ^ -3,600
. . . 3,800
•-• •" 4;500
*: !--4;400
:... ,. :340
•540
' -900
NA
. 1,000
•' 1.000
>i !k» -980
L : 1,000
ii.o
ii.o -.
ii.o
iib
ii.o
ii.o
il 0
ii.o
ii.o
ii:6
ii.o
ii.o
ii.o
iio
ii.o
il 0
ii.b
il 0
il.6
Chloromethane
(30 pg/L)
NA
NA
2.9
ii.o
2.5
2.7
ii.o
ii.o
ii.o
il.6
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.b
ii.o
NA
NA
52
i2.5
i5.b
i5.0
iS.b
1.6
ii.b
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
NA
i2.0
ii.o
ii.o
ii.o
NA
NA
iib
<100
<so <so <so
2.7
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.b
NA
i2.0
ii.o
ii.o
ii.o
NA
NA
•5.8
" 1
2.5
14
1.4
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o ii.o
ii.o
ii.o
ii.o
Methylene Chloride
(5 pg/L)
i^A
NA
ii.o
ii.o
il 0
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
iib
ii.o
iio
il 0
ii.o
ii.o"
ii.o
ii.o
NA
NA
i2.5
i2.5
i5.0
i5.0
iS.O
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
NA
i2.0
ii.b
il 0
ii.o
NA
NA
<to
<100
<so
<50
<S0
i3
1.5
il 0
il 0
1.2
ii.o
ii.b
ii.o
NA
i2 0
ii.o
il.6
il 0
NA
NA
ii.b
ilO
ii.o
il 0
il 0
il.6
ii.o
ii.o
ii.o
ii.o
ii6
ii.o
iio
ii.o
iio
iio
ii.o
Nitrate, Nitrate + Nitrite
(10 mg/L)
1.3
1.3
1.3
1.3
1.5
1.5
09
07
05
.1.3
1.8
.2
2.1
2.3
2.79
1.99
2.5
23
2.5
1.6
08
1.1
3.3
2.4
3.5
6.8
5.7
73
5.1
73
6.7
7.3
9.9
9.23
, :. . •!. „: . 10.5
NA
••^•••^ '- '• • -•11:6
9.8
8.i
8.7
•j, -.= , ... . .. 103
9.4
94
9.2
100
100
160
'•-. •: ..^r.;/ip;i
' 106
.? V .. .. -r ... .|02
98
77
73
7.9
95
hJA
73
88
7.0
1.4
15
i.5
1 4
1.3
1.4
14
1.4
1.5
15
i.4
• • • 1.4
• 1.6
2.7
2.7
2.5
2.4
38
5.1
NA = nol analyzed
NS = not sampled
Shaded indicates concenlrations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
1st Qtr = January - March
2nd Qtr = April - June
3rd Qtr = July - September
4th Qtr = Ociober - December
TABLE 1
HISTORIC SUMMARY OF MONITORING PARAMETERS UP TO THE 3rd QUARTER 2009
CHLOROFORM CONTAMINATION INVESTIGATION
DUSA WHITE MESA MILL
IWell
Sampling Event
•TW4-13
1st Otr a'l 5/05
2nd otr 5/25/05
3rd Oir 8/31/05
4th Qtr 12/7/05
Isi Qtr 3/9/05
2nd otr 6/14/06
3rd Otr 7/20/06
4th Qtr 11/8/05
1st Otr 2/28/07
2nd Qtr 6/27/07
3rd Qir 8/15/07
4th Otr 10/10/07
1st Otr 3/28/08
2nd Qtr 5/25/08
3rd Qtr 9/10/08
4th Otr. 10/i 5/08
1 st Qtr 3/4/09
2nd Qtr 5/23/09
3rd Qtr 9/14/09
TW4-14
1st Otr 3/16/05
2nd Qtr 5/25/05
3rd Qtr 8/31/05
4th Otr 12/7/05
1st oir 3/9/06
2nd Qtr 6/14/06
3rd Qtr 7/20/06
4ttlOtrli/8/06
lsl Qtr 2/28/07
2nd Qir 6/27/07
3rd Otr a/15/07
4th Qtr 10/10/07
ist Qtr 3/28/08
2nd Otr 5/25/08
3rd Qtr 9/10/08
4th Qtr 10/15/08
ist Qtr 3/4/09
2nd Qtr 6/23/09
3rd Otr 9/14/09
TW4-16
1st Qtr 3/16/05
2nd Qtr 5/25/05
3rd Qir a/31/05
4th Otr 12/7/05
ist Qtr 3/9/06
2nd Qtr 6/14/06
3rd Qtr 7/20/05
4th Qtr 11/8/06
1st Qtr 2/28/07
2nd Otr 5/27/07
3rd Qtr a/15/07
4th Qtr 10/10/07
ist Qir 3/2a'08
2nd Qtr 6/25/08
3rd Otr 9/10/08
4thQtrlb/15/b8
lsl Qtr 3/4/09
2nd Qtr 6/23/09
3rd Qtr 9/14/09
TW4-18
lsl Qtr 3/16/05
2nd Qtr 5/25/05
3rd Qtr a/31/05
4th(3trl2/7/b5
1st Qtr 3/9/06
2nd Qtr 6/14/06
3rd Otr 7/20/05
4th Qtr li/a/66
1st Otr 2/28/07
2nd Otr 6/27/07
3rd blr 8/15/07
4ih Qtr lb/10/07
ist Qtr 3/28/08
2nd Qtr 6/25/b8
3rd Qtr 9/10/08
4th Qtr 10/15/08
ist Qtr 3/4/09
2nd Qtr 6/23/09
l3rd Otr 9/14/09
Carbon Tetrachloride
(5 pg/L)
NA
NA
ii.o
ii.o
ii.o
ii.o
il.6
ii.o
ii.o
il.6
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
iio
NS
NS
NS
NS
NS
NS
NS
ii.o
ii.b
ii.o
ii.o
il .0
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
il.6
NA
NA
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.6
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
NA
NA
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
il 0
ii.o
il.6
ii.o
ii.o
ii.b
ii.o
ii.o
ii.b
ii.o
<'i^0
Parameter
GWQS
Chloride
(mg/L)
No GWQS
NA
NA
N/\
59
67
66
65
33
59
59
58
58
54
58
50
58
58
57
53
NS
NS
NS
NS
NS
NS
NS
37
38
38
36
38
57
35
34
40
35
36
38
NA
NA
NA
64
60
55
60
62
79
75
65
59
52
58
71
89
73
75
79
NA
NA
NA
41
36
35
35
34
30
28
32
27
23
23
26
36
29
30
26
Chloroform
(70 pg/L)
ii.o
i1.0
ii.o
ii.o
ii:6
ii.o
ii.o
ii.b
ii.o
ii.o
ii.b
ii.b
il 0
ii.b
ii.o
ii.o
ii.b
ii.o
ii.o
NS
NS
NS
NS
NS
NS
NS
NS
ii.o
i1.0
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
'• 240
*. 212
85
14
39
13
5.2
136
8.7
2.6
7.1
1.4
'11
ii.o
10
3.9
ii.o
ii.o
ii.o
38
29.8
39
14
12
12
10.8
i2.5
9.2
8
89
74
54
5.7
8
94
11
16
13
Chloromethane
(30 pg/L)
NA
rJA
3.1
ii.o
1.7
1.4
ii.o
ii.o
i1.0
ii.o
ii.o
ii.o
ii.o
ii.o
i1.0
ii.o
ii.o
ii.o
ii.o
NS
NS
NS
NS
NS
NS
NS
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
il 0
NA
NA
3.2
2.5
1.1
2.4
ii.o
ii.o
i1.0
ii.o
ii.o
ii.o
il.6
ii.o
il .0
il.6
ii.o
ii.o
iio
NA
NA
2.8
I.i
1.6
2.7
ii.b •
ii.o
ii.b
ii.o
ii.o
ii.o
ii.o
ii.o
iio
ii.b
ii.o
ii.o
iio
Methylene Chloride
(5 pg/L)
NA
i^A
il 0
ii.o
ii.o
ii.o
ii.o
ii.b
ii.o
iio
ii.b
ii.o
ii.b
il .b
ii.o
ii.o
ii.o
ii.o
ii.b
NS
NS
NS
NS
NS
NS
NS
ii.o
ii.b
ii.o
ii.o
ii.o
i1.0
ii.o
ii.b
ii.o
ii.b
ii.o
ii.o
NA
NA
•:> .V r t;
i i >a --, .*
i ti, „ 4,
•- ^ '^ :!.-.
"• r' 'I-i
i1.0 '
.(• -..•• i,. 'i .
ii.o
ii.o
iio
NA
NA
ii.o
ii.o
iib
ii.o
ii.o"
ii.o
ii.o •
ii.o
ii.o
i1.0
ii.o
ii.o
ii.o
iib
ii.o
ii.o
il 0
43
5.9
21
8.9
2.7
9.2
6.6
1.8
.5-1
"1
.'25
14
•6.6
Nitrate, Nitrate -f Nitrite
(10 mg/L)
•4.2
4.3
4.6
4.3
4.2
49
4.3
08
4.0
46
44
41
38
4.2
4.3
4.6
37
1.2
•••4.7
NS
NS
NS
NS
NS
NS
NS
2.4
23
1.4
1.1
08
04
i.6
1.38
0.76
1.6
1.4
1.5
ibi
iOI
iO 1
1.4
3
1.9
27
5.5
123
99
5.4
44
iOi
1.5
' 105
9.82
9.6
89
88
,,. ,, ..^^.^ -• - .r.- 7V .{-. ,;.• «12.9
. ... '-' .. 13.3
7.3
5.9
4.7
61
5.7
51
49
5
4.4
07
46
4.86
5.15
5.2
52
5.9
NA = not analyzed
NS = not sampled
Shaded indicates concenlrations exceeding GWQS
Bold and italics indicates the MDL exceeded the GWQS.
1 st Qtr = January - March
2nd Qtr = April - June
3rd Qtr = July - September
4th Qtr = October - December
TABLE 1
HISTORIC SUMMARY OF MONITORING PARAMETERS UP TO THE 3rd QUARTER 2009
CHLOROFORM CONTAMINATION INVESTIGATION
DUSA WHITE MESA MILL
IWell
Sampling Event
TW4-19
ist Qtr 3/16/05
2nd Otr 5/25/05
3rd Qir 8/31/05
4th Otr 12/7/05
1srOlr3/9/b6
2nd Qtr 6/14/06
3rd Otr 7/20/06
4th Otr 11/8/06
1st Qtr 2/28/07
2nd Qtr 6/27/07
3rd Qir 8/15/07
4th Otr 10/10/07
1st Otr 3/28/08
2nd Qir 6/25/08
3rd Otr 9/10/08
4th Otr 10/15/08
1st Otr 3/4/09
2nd Qtr 5/23/09
3rd Otr 9/14/09
|TW4-20
1st Otr 3/15/05
2nd Qtr'5/25/05
3rd Otr 8/31/05
4th Otr 12/7/05
ist Qtr 3/9/06
2nd Otr 5/14/06
3rd Qtr 7/20/06
4th Otr 11/8/06
1st Otr 2/28/07
2nd Qtr 6/27/07
3rd Qtr 8/15/07
Uih Otr 10/10/07
lsl Otr 3/28/08
2nd Otr 5/25/08
3rd Qtr 9/10/08
4th Otr 10/15/08
1st Otr 3/4/09
2nd Qtr 5/23/09
3rd Otr 9/14/09
TW4-21
1stOtr3/1S/05
2nd Qtr 5/25/05
3rd Qir 8/31/05
4th Otr 12/7/05
1statr3/9/b6
2nd Qtr 6/14/06
3rd Otr 7/20/06
4th Otr 11/8/06
1st Otr 2/28/07
2nd Otr 5/27/07
brd Otr a/15/07
!4th Otr 10/10/07
1st Otr 3/28/08
2nd Qtr 6/25/08
brd Otr 9/16/08
4th Otr 10/15/08
4th Otr 11/18/09
1st Otr 3/11/09
2nd Qtr 6/23/09
3rd Otr 9/14/09
TW4-22
Isi Otr 3/15/05
2nd Qtr 5/25/05
3rd Otr 8/31/05
Util Otr 12/7/05
Isi Qtr 3/9/06
2nd Qtr 6/14/06
3rd Otr 7/20/06
4th Otr 11/a/06
1st Otr 2/28/07
2nd Qtr 6127107
3rd Otr 8/15/07
4thatrlb/10/b7
lsl Qtr 3/28/08
2nd Ott 5/25/08
3rd oir 9/10/08
4th Otr 10/15/08
4th Otr 11/18/09
1stOtr3/il/09
2nd Otr 6/23/09
Isrd Otr 9/14/09
Carbon Tetrachloride
(5 pg/L)
NA
NA
i5.0
<so
<so
<50
<S0
ii.o
8.5 . .;
12 •'
1.2
1.2
15- •••
NA
iJO
i250
<S<W
<S00
<1000
^- .. ......
. .- .:'
:~ ... .f." »
NA
-J; ^ ^\ V
• i - -* -
NA
i5.0
ii.b
i2.5
i2.5
<.2-5
ii.o
ii.o
N/s:
il.6
ii.o
il.6
NA
i5.0
i5 0
iJO
<to
<to
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
il 0
NA
i2.0
ii.o
ii.o
ii.6
1.6
1-3
Parameter
GWOS
Chloride
(mg/L)
No GWQS
NA
NA
NA
81
86
116
123
134
133
1.9
1.9
2.9
v.--
129
132
i3i
128
113
i24
i27
132
43
••7.1
31
2.2
3.5
..-: 6.8
9
-.i. 13
• .15
i-5.7
4.9
•' 8.4
NA
Nh
2
1.8
. 5.8
7
1.7
.'. .1.-6
2
NA
NA
NA
;i.3
NA
NA
NA
Chloroform
(70 pg/L)
2:200
'^•'•"'- 1,200
•: .: 1,400
2,800
" »' r,200
i- . 1,100
i:^i20
"' --'1,050
S ..:, 1,200
Chloromethane
(30 pg/L)
NA
NA
i5 0
<sd
<so
<50
<50
25
il 0
Methylene Chloride
(5 pg/L)
NA
NA
i5.0
<S0
<so
<so
<50
ii.o
ii.o
Did not sample
i * 1,100
1,100
1,800
: -fr, 1',000
3,600
4,200
: 1,100
990
r -• 6,600
iio
ii.o
ii.b
ii.o
ii.o
ii.b
ii.o
ii.o
ii.b
ii.o
ii.o
ii.o
ii.o
i1.0
ii.o
ii.o
iib
ii.b
Monitor well was not installed
131
120
235
134
124
124
112
117
i70
132
191
155
168
164
164
153
* -39,000
/ i 3,800
19,000
•• * 9;200
: ,j. 61,000
5,300
- ii-;oob
. 4,400
1,800
•if -5£00
. 9,000
•• 13,000
•:• -% 30,000
21,000
NA
y i, 8,200
6,860
•'•* 13,000
NA
iib
<2S0
<s6o
<500
<1D00
1.9
<1-0 ...
ii.o
ii.o
ii.b
ii.b
ii.o
ii.o
NA
ii.o
ii.o
ii.o
NA
<I0
i250
<S00
<S00
<1000
2.2
1.1
ii.o
1.8
1.9
1.5
1.2
3.7
NA
= ,.> . li i5.2
4.2
4.4
Mqriitor well was not installed
353
347
318
357
295
305
327
300
288
i33i
271
244
284
279
291
281
' ''192
: ;• <-.78
86
• * •12b
: r- f12Q
- 108
.<-:^ >•• 139
. 160
300
•y >•• -.'. 140
.126
•* ^390
. k : :' 180
: 120
NA
;• t-_ . 170
180
• • • • • f 200
.-; .••< 200
NA
i5.0
ii.o
i2.5
i2.5
i2.5
ii.o
ii.o
ii.o
ii.o
ii.b
ii.o
ii.o
iio
NA
i2 0
ii.o
ii.o
i1.0
NA
i5.0
ii.o
i2.5
i2.5
i2.5
ii.o
i1.0
iio
ii.o
ii.o
ii.o
ii.o
iio
NA
i2.0
ii.o
i1.0
ii.o
Monitor well was not installed
253
235
221
221
236
347
273
259
238
519
271
524
539
177
177
391
-.340
290
> '320
. 39b
280
• -'-'; i 864
., :. 350
440
- <- -ti 740
•: 53b
44b
U :140b
1200
^ •'5300
N/\
630
' '" 390
s • 730
2.300
NA
i5.0
i5.0
ilO
iio
iio
1.5
ii.o
ii.o
ii.b
iio
ii.o
i1.0
ii.o
NA
i2.0
ii.o
ii.o
iio
NA
i5.0
iS.O
iTO
ilO
iTO
ii.o
ii.o
ii.o
ii.o
ii.o"
ii.o
il .0
ii.o
NA
i2.0
ii.o
il 0
iib
Nitrate, Nitrate -f Nitrite 1
(10 mg/L)
5.3
5.7
•4.5
iOi
4
5.2
4.3
4.6
4
41
4
2.2
2.8
36.2
' .•/. -^ - s -; ,„g
• • • 3.2'
2'.4
iOl
2.9
1.8
38
94
2.9
35
• 42
2.3
2.1
5.6
09
6
4.44
5.51
5.1
2.9
33
••• -'- •!•-• " i ---U.O
, • 101
95
85
; 102
89
87
8.7
86
8.5
83
- •'- ^^ -•' U'i:3
88
7.57
8
NA
83
81
9.2
. - 182
15:7
I. .-.- ; .1 ... 15.1
15.3
143
-.• .---•-• -,.. -:•- -- -,.14.5
15.9
• " • ••' ''20:9
.,i •; .- .=-. .••, 19.3
19.3
• •;:--•• •-•.-• • • •-• 18'.8
• j. iV. ., .•. .;.'39'.i
• 41.9
• V •'•;,•• ? • ••;.-• •i-3a7
: '^'. ', . .:.: :.. .^.36.3
NA
- -.^ '•*-'- -• •-' • r 20.7
"- 2bb
40.3
NA = not analyzed
NS = not sampled
Shaded indicates concentrations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
1st Qtr ^ January - March
2nd Qtr = April - June
3rd Otr - July - September
4th Otr = October - December
TABLE 1
HISTORIC SUMMARY OF MONITORING PARAMETERS UP TO THE 3rd QUARTER 2009
CHLOROFORM CONTAMINATION INVESTIGATION
DUSA WHITE MESA MILL
Well
Sampling Event
TW4-23
2nd Qtr 5/27/07
3rd Qtr a/15/07
4th Qtr 10/10/07
1st Otr 3/28/08
2nd Qtr 6/25/08
3rd Qtr 9/10/08
4th Qtr 10/15/08
4th Otr 11/18/09
1st Otr 3/4/09
2nd Qir 6/23/b9
3rd Qtr 9/14/09
TW4.24
2nd Qtr 6/27/07
3rdOir8/15/b7
4th Qtr 10/10/07
1st Qtr 3/28/08
2nd Qir 6/25/b8
3rd Qtr 9/10/08
4th Qtr 10/15/08
4th Qtr 11/18/09
1st Qtr 3/4/09
2nd Qtr 6/23/09
3rd Qtr 9/14/09
TW4-25
2nd Otr 5/27/07
3rd Otr a/15/07
4th Qtr 10/10/07
1st Qtr 3/28/08
2nd Qtr 6/25/08
3rd Otr 9/10/08
4th Qtr 10/15/08
4th Qtr 11/18/09
1st Qtr 3/4/09
2nd Otr 5/23/09
3rd Qtr 9/14/09
Carbon Tetrachloride
(5 pg/L)
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
NA
i2.0
ii.o
i1.0
i1.0
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
NA
i2.0
il 0
ii.o
ii.o
ii.o
il 0
ii.o
iio
ii.o
ii.o
NA
i2.0
ii.o
ii.o
ii.o
TW4-60 (Dl Blank)
1st Otr 3/16/05
2nd Qtr 5/25/05
3rd Qtr 8/31/05
4th Qtr 12/7/05
1st Qtr 3/9/06
2nd Qtr 6/14/06
4lh Qtr 11/8/05
1st Qtr 2/28/07
2nd Qtr 6/27/07
13rd Qtr 8/15/07
4th Qtr 10/10/07
1st Otr 3/28/08
2nd oir 5/25/08
3rd Qtr 9/8/08
1st Qtr 3/3/09
2nd Qtr 5/23/09
|3rd Qtr 9/14/09
NA
NA
ii.o
ii.o
i1.0
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
Parameter
GWQS
Chloride
(mg/L)
No GWQS
47
46
43
41
41
35
51
NA
41
43
43
770
791
592
740
834
1180
1130
NA
1010
759
618
396
382
358
374
344
333
366
NA
332
328
328
NA
NA
NA
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
il 0
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
Chloroform
(70 pg/L)
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
NA
i2.0
ii.o
ii.o
ii.o
2.6
2.2
1.5
1.5
1.4
2.9
NA
i2.0
1.4
1 5
1.4
il 0
22
iio
ii.o
il 0
ii.o
NA
i2.0
ii.o
ii.o
ii.o
ii.o
37.6
2.7
ii.o
ii.o
ii.o
ii.o
26
190
ii.o
5.7
1.1
13
3
33
3.5
32
Chloromethane
(30 pg/L)
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
NA
i2.0
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
i1.0
ii.o
ii.o
NA
i2.0
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
NA
i2.0
ii.o
ii.o
ii.o
NA
NA
2.4
ii.o
1.5
1.1
1.3
ii.o
i1.0
ii.o
i1.0
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
Methylene Chloride
(5 pg/L)
ii.o
i1.0
ii.o
ii.o
ii.o
ii.o
NA
i2.0
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
NA
i2.0
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
NA
i2.0
ii.o
ii.o
ii.o
NA
NA
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
1 4
i1.0
1 ' Nitrate, Nitrate + Nitrite |
(10 mg/L)
iOl
iO.1
iOl
ib.i
iOl
iO05
i0.05
NA
iO.1
iOI
iOI
,,.; i'.i.
; --. ---J- 'i •'.
:• *!.u -;>- .-,.-
NA
••^ .' ..«'.-,....=•'.
K.- t ,~;- ••*
;. -. ..*. :.&
. -.
NA
«.*,,--.*.. .^,
iOI
iOl
iO 1
iOI
iOI
iOI
i 1
iOl
iOl
iOl
iOI
iOl
i0.05
iO05
i0.05
iOl
iOI
26.1
;:..29
24:7
Z4.4
45.;
38.4
44.(
30.5
X.'4
30.7
171
^2S
17
,18.7
2Z1
18.f
21;;
15:3
15.;
3.3
TABLE 1
HISTORIC SUMMARY OF MONITORING PARAMETERS UP TO THE 3rd QUARTER 2009
CHLOROFORM CONTAMINATION INVESTIGATION
DUSA WHITE MESA MILL
NA = not analyzed
NS = not sampled
Shaded indicates concentrations exceeding GWQS.
Bold and italics indicates the MDL exceeded the GWQS.
1 st Qtr = January - March
2nd Qtr = April - June
3rd Qtr = July - September
4th Qtr = October - December
Well
Sampling Event
TW4-62
1st Otr 3/3/09
2nd Qtr 5/25/05
3rd Otr 8/31/05
4th Otr 12/7/05
1 st Otr 3/9/06
3rd Otr 7/20/05
1st Otr 2/28/07
2nd Otr 5«7/07
3rd Otr 8/15/07
'4th Otr 10/10/07
1 st Qtr 3/28/08
2nd Qtr 5/25/08
3rd Otr 9/8/08
list Otr 3/3/09
Parameter
GWQS
Carbon Tetrachloride
(5 pg/L)
Chloride
(mg/L)
No GWQS
Chloroform
(70 pg/L)
Cant lind reason lor TW4-62 in texted
ii.o
NA
i2S
iTOO
<S0
<50
ii.o
il 0
il 0
ii.o
iio
ii.o
ii.o
ii.o
TW4-63 (Rinsate)
2nd Otr 6/23/09 Ul.O
3rd Otr 9/14/09 Ul.O
TW4-65 (dup of TW4-3)
3rd Otr 9/10/08 lil.O
TW4-65 (dup of TW4-5)
41h Otr 11/8/06 |ilb
TW4'65 (dup of TW4-20)
4th dtr 11/8/05
ist Qtr 2/28/07
2nd Qtr 6/27/07
3rd Otr 8/15/07
4th Otr 10/10/07
1st Qtr 3/28/08
9.7
- •-• •* :-•- -?, .8.3
1.9
r. 5* .:..-i ?* 19
3.2
•••-: -.. •• - ••:• 8.2
TW4-65 (dup of MW.32 former TW4-17)
2nd Otr 5/25/08
1st Qtr 3/4/09
2nd Otr 6/24/09
3rd Otr 9/14/09
ii.o
ii.o .
ii.o
ii.o
TW4-70 (dup ot TW4-2)
lsl oir 3/4/09 |2.l
TW4-70 (dup of TW4-8)
2nd Qtr 5/25/08
2nd Otr &24/09
3rd oir 9/14/09
ii.o
ii.o
il 0
TW4-70 (dup of MW-26 former TW4-15)
ist otr 2/28/07
2nd CJtr 6/27/07
3rd Otr 8/15/07
kthOtr i0/lb/07
ii.o
ii.o
ii.o
ii.o
TW4-70 (dup of MW-32 former TW4-17)
1si Qtr 3/28/08
3rd Otr 9/10/08
TW4-73
3rd Otr 9/9/08
TW4-73
[lsl Qtr 3/10/09
ii.o
ii.o
il 0
NA
NA
51
52
48
i1.0
il 0
i1.0
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
1
18
56
126
139
125
137
176
137
29
31
26
29
44
45
41
26
55
53
51
58
31
31
34
3,500
3,100
-<-.. 3,200
3,3bb
- -L >t2,800
20
60
ii.o
1
1.6
ii.o
3
10
47
18
ii.o
5i3
13,700
> #16,000
1,700
:-*•' 27,000
3,600
- 12,000
i1.0
ii.o
ii.o
ii.o
3100
il 0
ii.o
ii.o
41
i *« 400
440
.* - 1,700
i1.0
ii.o
Cant lind reason for TW4-73 in texted
iio lil |il
Cant lind reason lor TW4-73 in texted
il 0 |i1 |19
Chloromethane
(30 pg/L)
ii.o
NA
i25
iioo
<so <50
ii.o
ii.o
ii.o
ii.o
ii.o
1.4
ii.o
il 0
iio
ii.o
ii.o
ii.o
18
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
Methylene Chloride
(5 pg/L)
ii.o
NA
<2S
<100
<S0
<S0
iio
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
2.2
1
ii.o
ii.o
2.2
1.2
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
il 0
18
ii.o
ii.o
ii.o
ii.o
ii.o
ii.o
Nitrate, Nitrate +
(10 mg/L)
iO05
iOI
iOl
iOI
iOl
i0.05
iO05
iO.1
iOl
iOI
iO05
iOl
iOl
iOl
7
ii.o
iOI
iOI
iOl
i0.05
i0.05
i0.05
Nitrite
102
58
66
62
5.4
01
2.72
5.7
1.5
43
1.9
4
5.3
46
81
06
03
06
CT
-5
7r
3
3
0
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c
tn Q.
5'
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0 > Tl
ni
CD
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Table 6
DRC Verification of Total Choroform Mass Retnoved as of 1st Quarter 2007
Well ID
'"Ave. Chloroform (ug/L)
Chloroform (g/L)
Chloroform (Ibs/L)
Chloroform (Ibs/gal)
'^'Total gallons pumped
lbs of chloroform removed
Gallons of chloroform removed
total lbs of chloroform removed
MW4
3,370
3.37E-03
7.45E-06
2.82E-05
1,307,110
36.8
3.00
total gallons of chloroform removed
rvlW4-19
2,660
2.66E-03
5.88E-06
2.22E-05
6,768,986
150.6
12.25
TW4-20
16240
1.62E-02
3.59E-05
1.36E-04
642,290
87.2
7.10
MW-26
1660
1.66E-03
3.67E-06
1.39E-05
930,510
12.9
1.05
287.56
23.40
(1) Average based on reported chloroform concentrations since pumping for each well was initiated.
(2) Total gallons since pumping started (April 2003) to the end ofthe 1st quarter 2007 sampling event (Marth 2007)
DRC Verification of Choroform IVlass Retnoved For tlie 2nd Quarter 2007
Well ID
Chloroform (ug/L)
Chloroform (g/L)
Chloroform (Ibs/L)
Chloroform (Ibs/gal)
(1) gallons pumped
lbs of chloroform removed
Gallons of chloroform removed
total lbs of chloroform removed
total qallons of chloroform remove
MW4
2,000
2.00E-03
4.42E-06
1.67E-05
81,230
1.4
0.11
d
TW4-19
0
O.OOE+00
O.OOE+00
O.OOE-i-00
605,400
0.0
0.00
TW4-20
1,800
1.80E-03
3.98E-06
1.51 E-05
163,520
2.5
0.20
MW-26
300
3.00E-04
6.63E-07
2.51 E-06
54,400
0.1
0.01
3.96
0.32
DRC Verification of Clioroform IVlass Retnoved For the 3rd Quarter 2007
IWell ID
Chloroform (ug/L)
Chloroform (g/L)
Chloroform (Ibs/L)
Chloroform (Ibs/gal)
(1) gallons pumped
lbs of chloroform removed
Gallons of chloroform removed
total lbs of chloroform removed
total gallons of chloroform remove
MW4
2,600
2.60E-03
5.74E-06
2.17E-05
90,830
2.0
0.16
d
TW4-19
1,100
1.1 OE-03
2.43E-06
9.20E-06
334,350
3.1
0.25
TW4-20
5,200
5.20E-03
1.15E-05
4.35E-05
63,630
2.8
0.23
MW-26
1,400
1.40E-03
3.09E-06
1.17E-05
61,750
0.7
0.06
8.54
0.69
DRC Verification of Choroform Mass Removed For the 4th Quarter 2007
Well ID
Chloroform (ug/L)
Chloroform (g/L)
Chloroform (Ibs/L)
Chloroform (Ibs/gal)
gallons pumped
lbs of chloroform removed
Gallons of chloroform removed
total lbs of chloroform removed
total qallons of chloroform remove
MW4
2,300
2.30E-03
5.08E-06
1.92E-05
90,830
1.7
0.14
d
TW4-19
1,100
1.1 OE-03
2.43E-06
9.20E-06
334,350
3.1
0.25
TW4-20
9.000
9.00E-03
1.99E-05
7.53E-05
63,630
4.8
0.39
MW-26
2,000
2.00E-03
4.42E-06
1.67E-05
61,750
1.0
0.08
10.64
0.87
DRC Verification of Choroform Mass Removed For the 1st Quarter 2008
Well ID
Chloroform (ug/L)
Chloroform (g/L)
Chloroform (Ibs/L)
Chloroform (Ibs/gal)
gallons pumped
lbs of chloroform removed
Gallons of chloroform removed
total lbs of chloroform removed
total gallons of chloroform remove
MW4
2,300
2.30E-03
5.08E-06
1.92E-05
83,950
1.6
0.13
id
TW4-19
• 1,800
1.80E-03
3.98E-06
1.51 E-05
304,784
4.6
0.37
TW4-20
13,000
1.30E-02
2.87E-05
1.09E-04
66,520
7.2
0.59
MW-26
930
9.30E-04
2.05E-06
7.78E-06
47,780
0.4
0.03
13.81
1.12
DRC Verification of Choroform Mass Removed For the 2nd Quarter 2008
Well ID
Chloroform (ug/L)
Chloroform (g/L)
Chloroform (Ibs/L)
Chloroform (Ibs/gal)
gallons pumped
lbs of chloroform removed
Gallons of chloroform removed
total lbs of chloroform removed
total gallons of chloroform remove
MW4
2,500
2.50E-03
5.52E-06
2.09E-05
62,780
1.3
0.11
d
TW4-19
1,000
1.00E-03
2.21 E-06
8.36E-06
380,310
3.2
0.26
TW4-20
30,000
3.00E-02
6.63E-05
2.51E-04
39,360
9.9
0.80
MW-26
1,300
1.30E-03
2.87E-06
1.09E-05
44,840
0.5
0.04
14.86
1.21
DRC Verification of Choroform Mass Removed For the 3rd Quarter 2008
Well ID
Chloroform (ug/L)
Chloroform (g/L)
Chloroform (Ibs/L)
Chloroform (Ibs/gal)
gallons pumped
lbs of chloroform removed
Gallons of chloroform removed
total lbs of chloroform removed
MW4
1,800
1.80E-03
3.98E-06
1.51 E-05
81,400
1.2
0.10
total qallons of chloroform removed
TW4-19
3,600
3.60E-03
7.95E-06
3.01 E-05
529,020
15.9
1.30
TW4-20
21,000
2.10E-02
4.64E-05
1.76E-04
53,260
9.4
0.76
MW-26
630
6.30E-04
1.39E-06
5.27E-06
61,280
0.3
0.03
26.83
2.18
DRC Verification of Choroform Mass Removed For the 4th Quarter 2008
Well ID
Chloroform (ug/L)
Chloroform (g/L)
Chloroform (Ibs/L)
Chloroform (Ibs/gal)
gallons pumped
lbs of chloroform removed
Gallons of chloroform removed
total lbs of chloroform removed
total qallons of chloroform remove
MW4
2,100
2.10E-03
4.64E-06
1.76E-05
91,320
1.6
0.13
id
TW4-19
4,200
4.20E-03
9.28E-06
3.51 E-05
589,620
20.7
1.69
TW4-20
6,800
6.80E-03
1.50E-05
5.69E-05
52,050
3.0
0.24
MW-26
1,700
1.70E-03
3.76E-06
1.42E-05
55,700
0.8
0.06
26.07
2.12
DRC Verification of Choroform Mass Removed For the 1st Quarter 2009
Well ID
Chloroform (ug/L)
Chloroform (g/L)
Chloroform (Ibs/L)
Chloroform (Ibs/gal)
gallons pumped
lbs of chloroform removed
Gallons of chloroform removed
total lbs of chloroform removed
total gallons of chloroform remove
MW4
2,200
2.20E-03
4.86E-06
1.84E-05
90,710
1.7
0.14
d
TW4-19
1,100
1.10E-03
2.43E-06
9.20E-06
469,100
4.3
0.35
TW4-20
8,200
8.20E-03
1.81 E-05
6.86E-05
52,050
3.6
0.29
MW-26
950
9.50E-04
2.10E-06
7.94E-06
52,970
0.4
0.03
9.97
0.81
DRC Verification of Choroform Mass Removed For the 2nd Quarter 2009
Well ID
Chloroform (ug/L)
Chloroform (g/L)
Chloroform (Ibs/L)
Chloroform (Ibs/gal)
gallons pumped
lbs of chloroform removed
Gallons of chloroform removed
total lbs of chloroform removed
total qallons of chloroform remove
MW4
1,800
1.80E-03
3.98E-06
1.51 E-05
83,090
1.3
0.10
d
TW4-19
990
9.90E-04
2.19E-06
8.28E-06
450,040
3.7
0.30
TW4-20
6,800
6.80E-03
1.50E-05
5.69E-05
49,270
2.8
0.23
MW-26
410
4.1 OE-04
9.06E-07
3.43E-06
58,050
0.2
0.02
7.98
0.65
DRC Verification of Choroform Mass Removed For the 3rd Quarter 2009
Well ID
Chloroform (ug/L)
Chloroform (g/L)
Chloroform (Ibs/L)
Chloroform (Ibs/gal)
gallons pumped
lbs of chloroform removed
Gallons of chloroform removed
total lbs of chloroform removed
total qallons of chloroform remove
MW4
2,000
2.00E-03
4.42E-06
1.67E-05
90,420
1.5
0.12
}d
TW4-19
3,300
3.30E-03
7.29E-06
2.76E-05
444,280
12.3
1.00
TW4-20
13,000
1.30E-02
2.87E-05
1.09E-04
51,030
5.5
0.45
MW-26
850
8.50E-04
1.88E-06
7.1 IE-06
57,610
0.4
0.03
19.73
1.61
1. Gallons pumped approximated
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Attachment 2
DUSA 3"* Quarter 2009 Groundwater Contour Map
Peel 1993 Groundwater Contour Map
DUSA y' Quarter 2009 Groundwater Contour Map
' 'I
0
0
p
fl
B
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n
-'i
Peel 1993 Groundwater Contour Map
R22E
Phreatic Surface of the Ground Water in the Burro Canyon Formation
Beneath the White Mesa Mill Site.
Figure 5.2 .2 -1
Attachnient 3
DUSA Chloroform Isoconcentration Map for the 3'^'' Quarter 2009 Monitoring Event.
y
i
lo
^XPLANATIQN
/'','' ,/'',''estimated caplure zone NOTES: MW-4, MW-26, TW4-19, and TW4-20 are pumping wells
/ ,' / / boundary stream tubes Locations and elevations ol TW4-23, TW4-24 and TW4-25 are approicimale
' ri^Hiiittinn frnm niimninn I ZZZ • . .
SCALE IN FEET
resulting from pumping
r)TW4-4
5550 temporary perched monitonng well
showing elevation in leet amsl
% ^i^^ perched monitoring well showing
5548 elevation in feet ansi
HYDRO
GEO
CHEM, INC.
KRI6E0 3rd QUARTER, 2009 WATER LEVELS
AND ESniUAtEO CAPTURE ZONES
WHITE MESA SfTE
(deiall map)
SJS
REFinENCC
H:/718000/nov09^l0909cz srf