##### QADATA Summary -- May 2004

The Inorganic Blind Sample Project (IBSP) reviews 108 inorganic
analytical lines at the National Water Quality Laboratory (NWQL) and 79
inorganic analytical lines at the Ocala Water Quality and Research
Laboratory (OWQRL) using double-blind, quality-control samples. The
QADATA Summary is a short summary of only those analytical lines for
which the quality-control charts indicate or have indicated a bias
and/or higher than expected variability. Overall, the vast majority of
the analyses at the NWQL and OWQRL demonstrate acceptable variability
and little or no bias.

The data reviewed is for the time period 10/01/03 through 05/17/04;
however, longer-range charts are used when they add clarity to the
problem. The attached quality-control charts contain data from samples
that have been subject to the same laboratory handling procedures as the
samples that are submitted by the USGS district offices, and the data
have the same level of quality-control review as the data released to
the districts. Therefore, any factors that affect the districts' data
should also affect the data displayed in the IBSP quality-control
charts. Samples for which the results are outside of control limits\
(+/-2 f-pseudosigma) are reanalyzed, but the values are not updated.
Data from samples that are known to have been affected by a problem
independent of the laboratory are not displayed on the charts.

In this report, the "Problem" is determined and written by IBSP. The
"Problem" is then sent to the laboratories that then get two weeks to
respond to the issue by writing a "Lab Comment" and a "Corrective
Action." The labs' comments are incorporated into the QADATA Summary as
received. Comments from previous QADATA Summaries are included in this
report to help provide a clearer perspective of the overall concern.

Current charts (updated twice weekly) may be accessed at
<http://bqs.usgs.gov/bsp/FY04charts.htm>. Laboratory and district
personnel can also make their own QADATA retrieval to parallel their
project's sampling period by using the QADATA Application online at
[http://bqs.usgs.gov/bsp](http://bqs.usgs.gov/bsp/mainpage.html) (select
QADATA Application button). Charts pertaining specifically to this
report can be accessed electronically by following the underlined
hyperlinks embedded within the report and associated with each analysis
discussed.

*Tedmund M. Struzeski*

<struzesk@usgs.gov>

Table of Contents

Note: All analytes are hyperlinked to their respective positions within
the report.

NWQL

Analyte Page

Arsenic, Filtered, GFAA, Labcode 2160, Parmcode 1000C . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . 3

Cadmium, Filtered, ICP-MS, Labcode 1788, Parmcode 1025G . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . 3

Cadmium, Whole-Water Recoverable, GFAA, Labcode 1555, Parmcode 1027F . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . 4

Chromium, Filtered, GFAA, Labcode 1936, Parmcode 1030I . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . 4

Strontium, Filtered, ICP-MS, Labcode 2507, Parmcode 1080I . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . 5

Uranium, Filtered, ICP-MS, Labcode 1797, Parmcode 22703G. . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . 5

Calcium, Filtered, ICP, Labcode 0659, Parmcode 0915D . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . 6

Magnesium, Filtered, ICP, Labcode 0663, Parmcode 0925C . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . 6

Sodium, Filtered, ICP, Labcode 0675, Parmcode 0930C . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . 6

Silica, Filtered, Colorimetric, Labcode 0056, Parmcode 0955C . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . 8

Residue on Evaporation, Filtered, Gravimetric, Labcode 0027, Parmcode
70300A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . 8

**OWQRL**

Analyte

**Arsenic, Whole-Water Recoverable,** GFAA, Labcode 3119, Parmcode
1002(1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . 9

**Thallium, Whole-Water Recoverable,** GFAA, Labcode 3131, Parmcode
1059(0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . 10

Table 1

NWQL PERFORMANCE ON IBSP SAMPLES

######### **Note: Click the blue, underlined text in the left column to access the control chart for the associated parameter.**

+---------+---+------------------+-------------------+-------------------+
| **Trace | * |                  | **NWQL**          | **Corrective**    |
| Metal   | * |                  |                   |                   |
| De      | P |                  | **Lab Comment**   | **Action**        |
| termina | r |                  |                   |                   |
| tions** | o |                  |                   |                   |
|         | b |                  |                   |                   |
|         | l |                  |                   |                   |
|         | e |                  |                   |                   |
|         | m |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+=========+===+==================+===================+===================+
| [**A    | * |                  |                   | **NWQL continues  |
| rsenic, | * |                  |                   | to closely        |
| Filt    | R |                  |                   | monitor           |
| ered**] | e |                  |                   | analysis.**       |
| (http:/ | s |                  |                   |                   |
| /bqs.us | u |                  |                   |                   |
| gs.gov/ | l |                  |                   |                   |
| bsp/QAD | t |                  |                   |                   |
| ATA_all | s |                  |                   |                   |
| /MAY04N | f |                  |                   |                   |
| WQL0100 | o |                  |                   |                   |
| 0C.gif) | r |                  |                   |                   |
| *       | s |                  |                   |                   |
| *GFAA** | a |                  |                   |                   |
|         | m |                  |                   |                   |
| **      | p |                  |                   |                   |
| labcode | l |                  |                   |                   |
| 2160**  | e |                  |                   |                   |
|         | s |                  |                   |                   |
| **p     | a |                  |                   |                   |
| armcode | n |                  |                   |                   |
| 1000C** | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | y |                  |                   |                   |
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|         | * |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| *P      |   |                  |                   |                   |
| revious |   |                  |                   |                   |
| c       |   |                  |                   |                   |
| omments |   |                  |                   |                   |
| for     |   |                  |                   |                   |
| a       |   |                  |                   |                   |
| rsenic, |   |                  |                   |                   |
| fi      |   |                  |                   |                   |
| ltered, |   |                  |                   |                   |
| GFAA,   |   |                  |                   |                   |
| labcode |   |                  |                   |                   |
| 2160,   |   |                  |                   |                   |
| p       |   |                  |                   |                   |
| armcode |   |                  |                   |                   |
| 1000C*  |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | T |                  | The slight        | After making new  |
|         | h |                  | positive bias is  | standards and     |
| >       | i |                  | also evident on   | performing        |
|  QADATA | s |                  | QC charts for     | maintenance, the  |
| >       | a |                  | third-party check | positive bias is  |
| Summary | n |                  | samples (TPC).    | no longer         |
| > March | a |                  | New standards     | evident. This     |
| > 2004  | l |                  | were made and     | line will         |
|         | y |                  | maintenance was   | continue to be    |
|         | t |                  | performed during  | monitored for     |
|         | i |                  | the week of March | bias.             |
|         | c |                  | 8^th^, 2004.      |                   |
|         | a |                  |                   |                   |
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+---------+---+------------------+-------------------+-------------------+
| From    | D |                  | New standards     | New calibration   |
|         | a |                  | were made in      | standards will be |
| >       | t |                  | November of 2003  | remade and        |
|  QADATA | a |                  | including         | verified as of    |
| >       | s |                  | Continuing        | February 6^th^,   |
| Summary | i |                  | Calibration       | 2004. The element |
| >       | n |                  | Verifications     | will continue to  |
| January | c |                  | (CCV) and         | be monitored      |
| > 2004  | e |                  | Third-Party Check | closely for a     |
|         | O |                  | standards (TPC).  | bias.             |
|         | c |                  | Both the CCV's    |                   |
|         | t |                  | and TPC's for     |                   |
|         | o |                  | arsenic are       |                   |
|         | b |                  | showing a         |                   |
|         | e |                  | positive bias on  |                   |
|         | r |                  | QC charts.        |                   |
|         | 2 |                  |                   |                   |
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+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [**C    | * |                  |                   | **NWQL continues  |
| admium, | * |                  |                   | to closely        |
| Filt    | A |                  |                   | monitor           |
| ered**] | s |                  |                   | analysis.**       |
| (http:/ | o |                  |                   |                   |
| /bqs.us | f |                  |                   |                   |
| gs.gov/ | M |                  |                   |                   |
| bsp/QAD | a |                  |                   |                   |
| ATA_all | r |                  |                   |                   |
| /MAY04N | c |                  |                   |                   |
| WQL0102 | h |                  |                   |                   |
| 5G.gif) | 2 |                  |                   |                   |
| *       | 0 |                  |                   |                   |
| *ICP-MS | 0 |                  |                   |                   |
| labcode | 4 |                  |                   |                   |
| 1788    | , |                  |                   |                   |
| p       | r |                  |                   |                   |
| armcode | e |                  |                   |                   |
| 1025G** | s |                  |                   |                   |
|         | u |                  |                   |                   |
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|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
|         | A |                  |                   |                   |
|         | n |                  |                   |                   |
|         | a |                  |                   |                   |
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|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | h |                  |                   |                   |
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|         | d |                  |                   |                   |
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|         | c |                  |                   |                   |
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|         | y |                  |                   |                   |
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|         | o |                  |                   |                   |
|         | n |                  |                   |                   |
|         | i |                  |                   |                   |
|         | t |                  |                   |                   |
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|         | d |                  |                   |                   |
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|         | A |                  |                   |                   |
|         | D |                  |                   |                   |
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|         | a |                  |                   |                   |
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|         | y |                  |                   |                   |
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|         | s |                  |                   |                   |
|         | d |                  |                   |                   |
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|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | r |                  |                   |                   |
|         | i |                  |                   |                   |
|         | b |                  |                   |                   |
|         | u |                  |                   |                   |
|         | t |                  |                   |                   |
|         | e |                  |                   |                   |
|         | d |                  |                   |                   |
|         | . |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| *P      |   |                  |                   |                   |
| revious |   |                  |                   |                   |
| c       |   |                  |                   |                   |
| omments |   |                  |                   |                   |
| for     |   |                  |                   |                   |
| c       |   |                  |                   |                   |
| admium, |   |                  |                   |                   |
| fi      |   |                  |                   |                   |
| ltered, |   |                  |                   |                   |
| ICP-MS, |   |                  |                   |                   |
| labcode |   |                  |                   |                   |
| 1788,   |   |                  |                   |                   |
| p       |   |                  |                   |                   |
| armcode |   |                  |                   |                   |
| 1025G*  |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | D |                  | Due to the        | The issue of      |
|         | a |                  | on-going          | possible          |
| >       | t |                  | monitoring of     | interferences     |
|  QADATA | a |                  | internal QC, a    | that could affect |
| >       | f |                  | positive bias is  | cadmium is being  |
| Summary | r |                  | still not evident | discussed with    |
| > March | o |                  | on NWQL QC        | the NWQL's Method |
| > 2004  | m |                  | charts. To verify | Research and      |
|         | J |                  | this, an          | Development       |
|         | a |                  | additional TPC    | Program. More     |
|         | n |                  | from a different  | research needs to |
|         | u |                  | source than is    | be done. Also,    |
|         | a |                  | routinely used by | internal QC and   |
|         | r |                  | ICP-MS was run    | IBSP charts will  |
|         | y |                  | during the week   | continue to be    |
|         | 2 |                  | of March 8^th^,   | monitored for     |
|         | 0 |                  | 2004, to verify   | bias and          |
|         | 0 |                  | the ICP-MS        | variability.      |
|         | 4 |                  | calibration       |                   |
|         | t |                  | curve.            |                   |
|         | h |                  | Calibration and   |                   |
|         | r |                  | QC are            |                   |
|         | o |                  | acceptable.       |                   |
|         | u |                  |                   |                   |
|         | g |                  |                   |                   |
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|         | P |                  |                   |                   |
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|         | 2 |                  |                   |                   |
|         | 3 |                  |                   |                   |
|         | 7 |                  |                   |                   |
|         | 6 |                  |                   |                   |
|         | ) |                  |                   |                   |
|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | D |                  | The bias is not   | New calibration   |
|         | a |                  | evident on NWQL   | standards were    |
| >       | t |                  | QC charts.        | made and verified |
|  QADATA | a |                  |                   | for use at the    |
| >       | f |                  |                   | end of December   |
| Summary | o |                  |                   | 2003. We will     |
| >       | r |                  |                   | continue to       |
| January | t |                  |                   | monitor internal  |
| > 2004  | h |                  |                   | QC and IBSP       |
|         | e |                  |                   | charts for bias   |
|         | l |                  |                   | and variability.  |
|         | a |                  |                   | If the TPC        |
|         | s |                  |                   | standards         |
|         | t |                  |                   | indicate a bias,  |
|         | s |                  |                   | calibration       |
|         | i |                  |                   | standards will be |
|         | x |                  |                   | remade and        |
|         | m |                  |                   | verified.         |
|         | o |                  |                   |                   |
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+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [**C    | * |                  | **The bias is not | **NWQL continues  |
| admium, | * |                  | evident on NWQL   | to closely        |
| Whol    | D |                  | QC charts.        | monitor analysis  |
| e-Water | a |                  | Calibration       | for bias and      |
| Recover | t |                  | standards have    | evaluate the need |
| able**] | a |                  | been checked for  | for instrument    |
| (http:/ | r |                  | accuracy and have | modifications.**  |
| /bqs.us | e |                  | been verified.    |                   |
| gs.gov/ | c |                  | Study is being    |                   |
| bsp/QAD | e |                  | conducted to      |                   |
| ATA_all | i |                  | establish if any  |                   |
| /MAY04N | v |                  | instrument        |                   |
| WQL0102 | e |                  | modifications     |                   |
| 7F.gif) | d |                  | should be         |                   |
| **GFAA  | a |                  | performed.**      |                   |
| labcode | s |                  |                   |                   |
| 1555    | o |                  |                   |                   |
| p       | f |                  |                   |                   |
| armcode | M |                  |                   |                   |
| 1027F** | a |                  |                   |                   |
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+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [**Ch   | * |                  |                   | **NWQL continues  |
| romium, | * |                  |                   | to closely        |
| Filt    | D |                  |                   | monitor           |
| ered**] | a |                  |                   | analysis.**       |
| (http:/ | t |                  |                   |                   |
| /bqs.us | a |                  |                   |                   |
| gs.gov/ | r |                  |                   |                   |
| bsp/QAD | e |                  |                   |                   |
| ATA_all | c |                  |                   |                   |
| /MAY04N | e |                  |                   |                   |
| WQL0103 | i |                  |                   |                   |
| 0I.gif) | v |                  |                   |                   |
| **GFAA  | e |                  |                   |                   |
| labcode | d |                  |                   |                   |
| 1936    | s |                  |                   |                   |
| p       | i |                  |                   |                   |
| armcode | n |                  |                   |                   |
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|         | l |                  |                   |                   |
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|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | w |                  |                   |                   |
|         | i |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | + |                  |                   |                   |
|         | / |                  |                   |                   |
|         | - |                  |                   |                   |
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|         | f |                  |                   |                   |
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|         | s |                  |                   |                   |
|         | e |                  |                   |                   |
|         | u |                  |                   |                   |
|         | d |                  |                   |                   |
|         | o |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | g |                  |                   |                   |
|         | m |                  |                   |                   |
|         | a |                  |                   |                   |
|         | . |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
|         |   |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
|         | N |                  |                   |                   |
|         | o |                  |                   |                   |
|         | c |                  |                   |                   |
|         | o |                  |                   |                   |
|         | r |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | c |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | a |                  |                   |                   |
|         | c |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | o |                  |                   |                   |
|         | n |                  |                   |                   |
|         | n |                  |                   |                   |
|         | e |                  |                   |                   |
|         | c |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | y |                  |                   |                   |
|         | . |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| *P      |   |                  |                   |                   |
| revious |   |                  |                   |                   |
| c       |   |                  |                   |                   |
| omments |   |                  |                   |                   |
| for     |   |                  |                   |                   |
| ch      |   |                  |                   |                   |
| romium, |   |                  |                   |                   |
| fi      |   |                  |                   |                   |
| ltered, |   |                  |                   |                   |
| GFAA,   |   |                  |                   |                   |
| labcode |   |                  |                   |                   |
| 1936,   |   |                  |                   |                   |
| p       |   |                  |                   |                   |
| armcode |   |                  |                   |                   |
| 1030I*  |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | S |                  | This line had     | Maintenance was   |
|         | i |                  | three samples     | performed on the  |
| >       | n |                  | that fell outside | instrument during |
|  QADATA | c |                  | (low) of the +/-2 | the week of March |
| >       | e |                  | f-pseudosigma     | 8, 2004, and      |
| Summary | l |                  | which contributed | early evidence    |
| > March | a |                  | to the large      | suggests that the |
| > 2004  | t |                  | negative bias.    | positive bias has |
|         | e |                  | One, with a       | decreased. Also,  |
|         | - |                  | target value of   | the three samples |
|         | J |                  | 6.12, was         | mentioned in the  |
|         | a |                  | reported at 1.45. | comments section  |
|         | n |                  | The other two     | were rerun and    |
|         | u |                  | values were       | were within       |
|         | a |                  | between 2 and 3\  | acceptable        |
|         | r |                  | f-pseudosigma.    | limits. The       |
|         | y |                  |                   | recalculated bias |
|         | 2 |                  | The negative bias | is 4.5%. Analyst  |
|         | 0 |                  | on BQS control    | will continue to  |
|         | 0 |                  | charts is not     | monitor bias and  |
|         | 4 |                  | evident on NWQL   | variability and   |
|         | , |                  | QC charts. In     | perform           |
|         | v |                  | fact, a slightly  | maintenance as    |
|         | a |                  | high bias was     | needed to         |
|         | r |                  | evident on NWQL   | alleviate both of |
|         | i |                  | QC charts at the  | these problems.   |
|         | a |                  | end of February.  |                   |
|         | b |                  |                   | NOTE: Three       |
|         | i |                  |                   | environmental     |
|         | l |                  |                   | samples           |
|         | i |                  |                   | associated with   |
|         | t |                  |                   | the set that had  |
|         | y |                  |                   | the low value of  |
|         | h |                  |                   | 1.45 were updated |
|         | a |                  |                   | in LIMS and       |
|         | s |                  |                   | released to the   |
|         | i |                  |                   | customer.         |
|         | n |                  |                   |                   |
|         | c |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
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|         | d |                  |                   |                   |
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|         | n |                  |                   |                   |
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|         | e |                  |                   |                   |
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|         | e |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | h |                  |                   |                   |
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|         | s |                  |                   |                   |
|         | \ |                  |                   |                   |
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|         | 1 |                  |                   |                   |
|         | 3 |                  |                   |                   |
|         | . |                  |                   |                   |
|         | 5 |                  |                   |                   |
|         | % |                  |                   |                   |
|         | ) |                  |                   |                   |
|         | d |                  |                   |                   |
|         | e |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | l |                  |                   |                   |
|         | o |                  |                   |                   |
|         | p |                  |                   |                   |
|         | e |                  |                   |                   |
|         | d |                  |                   |                   |
|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [**Str  | * |                  |                   | **NWQL continues  |
| ontium, | * |                  |                   | to closely        |
| Filt    | A |                  |                   | monitor           |
| ered**] | s |                  |                   | analysis.**       |
| (http:/ | o |                  |                   |                   |
| /bqs.us | f |                  |                   |                   |
| gs.gov/ | M |                  |                   |                   |
| bsp/QAD | a |                  |                   |                   |
| ATA_all | r |                  |                   |                   |
| /MAY04N | c |                  |                   |                   |
| WQL0108 | h |                  |                   |                   |
| 0I.gif) | 2 |                  |                   |                   |
| *       | 0 |                  |                   |                   |
| *ICP-MS | 0 |                  |                   |                   |
| labcode | 4 |                  |                   |                   |
| 2507    | v |                  |                   |                   |
| p       | a |                  |                   |                   |
| armcode | r |                  |                   |                   |
| 1080I** | i |                  |                   |                   |
|         | a |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | l |                  |                   |                   |
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|         | y |                  |                   |                   |
|         | h |                  |                   |                   |
|         | a |                  |                   |                   |
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|         | i |                  |                   |                   |
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|         | c |                  |                   |                   |
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|         | a |                  |                   |                   |
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|         | d |                  |                   |                   |
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|         | v |                  |                   |                   |
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|         | l |                  |                   |                   |
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|         | f |                  |                   |                   |
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|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
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|         | l |                  |                   |                   |
|         | l |                  |                   |                   |
|         | i |                  |                   |                   |
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|         | \ |                  |                   |                   |
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|         | / |                  |                   |                   |
|         | - |                  |                   |                   |
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|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
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|         | 0 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 4 |                  |                   |                   |
|         | . |                  |                   |                   |
|         | D |                  |                   |                   |
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|         | - |                  |                   |                   |
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|         | l |                  |                   |                   |
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|         | m |                  |                   |                   |
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|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | b |                  |                   |                   |
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|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
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|         | r |                  |                   |                   |
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|         | c |                  |                   |                   |
|         | t |                  |                   |                   |
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|         | d |                  |                   |                   |
|         | . |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
|         |   |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
|         | N |                  |                   |                   |
|         | o |                  |                   |                   |
|         | c |                  |                   |                   |
|         | o |                  |                   |                   |
|         | r |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | c |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | a |                  |                   |                   |
|         | c |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | o |                  |                   |                   |
|         | n |                  |                   |                   |
|         | n |                  |                   |                   |
|         | e |                  |                   |                   |
|         | c |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | y |                  |                   |                   |
|         | . |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [**U    | * |                  | **NWQL QC charts  | **New uranium     |
| ranium, | * |                  | show increased    | standards were    |
| Filt    | A |                  | variability.**    | purchased,        |
| ered**] | s |                  |                   | prepared, and     |
| (http:/ | o |                  |                   | verified by April |
| /bqs.us | f |                  |                   | 19^th^. Since     |
| gs.gov/ | M |                  |                   | then, NWQL QC     |
| bsp/QAD | a |                  |                   | Charts show       |
| ATA_all | r |                  |                   | reduced           |
| /MAY04N | c |                  |                   | variability. The  |
| WQL2270 | h |                  |                   | NWQL will         |
| 3G.gif) | 2 |                  |                   | continue to       |
| *       | 0 |                  |                   | closely monitor   |
| *ICP-MS | 0 |                  |                   | the analysis for  |
| labcode | 4 |                  |                   | variability.**    |
| 1797    | v |                  |                   |                   |
| p       | a |                  |                   |                   |
| armcode | r |                  |                   |                   |
| 2       | i |                  |                   |                   |
| 2703G** | a |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | l |                  |                   |                   |
|         | i |                  |                   |                   |
|         | t |                  |                   |                   |
|         | y |                  |                   |                   |
|         | h |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | c |                  |                   |                   |
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|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | e |                  |                   |                   |
|         | d |                  |                   |                   |
|         | . |                  |                   |                   |
|         | F |                  |                   |                   |
|         | o |                  |                   |                   |
|         | u |                  |                   |                   |
|         | r |                  |                   |                   |
|         | o |                  |                   |                   |
|         | u |                  |                   |                   |
|         | t |                  |                   |                   |
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|         | f |                  |                   |                   |
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|         | 5 |                  |                   |                   |
|         | v |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
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|         | s |                  |                   |                   |
|         | ( |                  |                   |                   |
|         | 2 |                  |                   |                   |
|         | 7 |                  |                   |                   |
|         | % |                  |                   |                   |
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|         | d |                  |                   |                   |
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|         | f |                  |                   |                   |
|         | c |                  |                   |                   |
|         | o |                  |                   |                   |
|         | n |                  |                   |                   |
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|         | o |                  |                   |                   |
|         | l |                  |                   |                   |
|         | l |                  |                   |                   |
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|         | m |                  |                   |                   |
|         | i |                  |                   |                   |
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|         | s |                  |                   |                   |
|         | \ |                  |                   |                   |
|         | ( |                  |                   |                   |
|         | + |                  |                   |                   |
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|         | - |                  |                   |                   |
|         | 2 |                  |                   |                   |
|         | f |                  |                   |                   |
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|         | s |                  |                   |                   |
|         | e |                  |                   |                   |
|         | u |                  |                   |                   |
|         | d |                  |                   |                   |
|         | o |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | g |                  |                   |                   |
|         | m |                  |                   |                   |
|         | a |                  |                   |                   |
|         | ) |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | o |                  |                   |                   |
|         | f |                  |                   |                   |
|         | M |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | c |                  |                   |                   |
|         | h |                  |                   |                   |
|         | 2 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 4 |                  |                   |                   |
|         | . |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+

+---------+---+--------------------+--------------------+-----------------+
| **Major | * |                    | **NWQL**           | **Corrective**  |
| De      | * |                    |                    |                 |
| termina | P |                    | **Lab Comment**    | **Action**      |
| tions** | r |                    |                    |                 |
|         | o |                    |                    |                 |
|         | b |                    |                    |                 |
|         | l |                    |                    |                 |
|         | e |                    |                    |                 |
|         | m |                    |                    |                 |
|         | * |                    |                    |                 |
|         | * |                    |                    |                 |
+=========+===+====================+====================+=================+
| [**C    | * |                    | The increase in    | **NWQL          |
| alcium, | * |                    | variability is due | continues to    |
| Filt    | D |                    | in part to several | investigate the |
| ered**] | a |                    | outliers, some of  | cause of the    |
| (http:/ | t |                    | which have been    | outliers on     |
| /bqs.us | a |                    | due to human       | runs with       |
| gs.gov/ | r |                    | error. Since the   | acceptable QC   |
| bsp/QAD | e |                    | last QADATA        | by running      |
| ATA_all | c |                    | Summary (March     | tests on the    |
| /MAY04N | e |                    | 2004), however,    | instrument and  |
| WQL0091 | i |                    | all outliers have  | determining     |
| 5D.gif) | v |                    | been on runs with  | whether         |
| **ICP   | e |                    | acceptable QC.     | contamination   |
| labcode | d |                    | Their cause is not | and carry-over  |
| 0659    | s |                    | known at this      | is present.**   |
| p       | i |                    | time. Tests have   |                 |
| armcode | n |                    | been performed     | **New standards |
| 0915D** | c |                    | that rule out      | for calcium,    |
|         | e |                    | non-instrument     | magnesium, and  |
| [**Mag  | t |                    | related            | sodium have     |
| nesium, | h |                    | contamination.     | been prepared   |
| Filt    | e |                    | Tests are being    | and were        |
| ered**] | l |                    | conducted to       | validated on    |
| (http:/ | a |                    | determine whether  | May 12^th^,     |
| /bqs.us | s |                    | instrument         | 2004. NWQL will |
| gs.gov/ | t |                    | contamination and  | continue to     |
| bsp/QAD | Q |                    | carry-over is      | closely monitor |
| ATA_all | A |                    | present.           | the analysis    |
| /MAY04N | D |                    |                    | for bias.**     |
| WQL0092 | A |                    | The positive bias  |                 |
| 5C.gif) | T |                    | for calcium and    |                 |
| **ICP   | A |                    | magnesium on BQS   |                 |
| labcode | S |                    | control charts is  |                 |
| 0663    | u |                    | also evident on    |                 |
| p       | m |                    | NWQL QC charts,    |                 |
| armcode | m |                    | prompting the      |                 |
| 0925C** | a |                    | preparation of new |                 |
|         | r |                    | standards. The     |                 |
| [**     | y |                    | positive bias for  |                 |
| Sodium, | i |                    | sodium is not      |                 |
| Filt    | n |                    | evident on NWQL    |                 |
| ered**] | d |                    | control charts.    |                 |
| (http:/ | i |                    |                    |                 |
| /bqs.us | c |                    |                    |                 |
| gs.gov/ | a |                    |                    |                 |
| bsp/QAD | t |                    |                    |                 |
| ATA_all | e |                    |                    |                 |
| /MAY04N | a |                    |                    |                 |
| WQL0093 | p |                    |                    |                 |
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+---------+---+--------------------+--------------------+-----------------+
| *P      |   |                    |                    |                 |
| revious |   |                    |                    |                 |
| c       |   |                    |                    |                 |
| omments |   |                    |                    |                 |
| for     |   |                    |                    |                 |
| c       |   |                    |                    |                 |
| alcium, |   |                    |                    |                 |
| mag     |   |                    |                    |                 |
| nesium, |   |                    |                    |                 |
| and     |   |                    |                    |                 |
| sodium  |   |                    |                    |                 |
| by ICP  |   |                    |                    |                 |
| (next   |   |                    |                    |                 |
| page)*  |   |                    |                    |                 |
+---------+---+--------------------+--------------------+-----------------+
| From    | N |                    | The increase in    | As stated in    |
|         | e |                    | variability is due | the January     |
| >       | w |                    | in part to several | 2004 QADATA     |
|  QADATA | i |                    | outliers, some of  | Summary for     |
| >       | n |                    | which have been    | cadmium WWR     |
| Summary | s |                    | due to human       | GFAA (labcode   |
| > March | t |                    | error. Since the   | 1555), use of   |
| > 2004  | r |                    | last data summary  | an additional   |
|         | u |                    | (January 2004),    | QC check sheet  |
|         | m |                    | however, all       | that is         |
|         | e |                    | outliers have been | included in all |
|         | n |                    | on runs with       | data packets    |
|         | t |                    | acceptable QC.     | was implemented |
|         | a |                    | Their cause is not | to help         |
|         | t |                    | known at this      | alleviate       |
|         | i |                    | time.              | incorrect data  |
|         | o |                    |                    | going in LIMS.  |
|         | n |                    |                    | This practice   |
|         | w |                    |                    | was implemented |
|         | a |                    |                    | for ICP         |
|         | s |                    |                    | processes in    |
|         | i |                    |                    | October 2003,   |
|         | m |                    |                    | and data shows  |
|         | p |                    |                    | that it has     |
|         | l |                    |                    | been useful in  |
|         | e |                    |                    | eliminating     |
|         | m |                    |                    | some errors. We |
|         | e |                    |                    | will continue   |
|         | n |                    |                    | to investigate  |
|         | t |                    |                    | the cause of    |
|         | e |                    |                    | the outliers on |
|         | d |                    |                    | runs with       |
|         | i |                    |                    | acceptable QC.  |
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+---------+---+--------------------+--------------------+-----------------+
|         |   |                    |                    |                 |
+---------+---+--------------------+--------------------+-----------------+
| [**     | * |                    |                    | **NWQL          |
| Silica, | * |                    |                    | continues to    |
| Filt    | F |                    |                    | closely monitor |
| ered**] | r |                    |                    | analysis.**     |
| (http:/ | o |                    |                    |                 |
| /bqs.us | m |                    |                    |                 |
| gs.gov/ | m |                    |                    |                 |
| bsp/QAD | i |                    |                    |                 |
| ATA_all | d |                    |                    |                 |
| /MAY04N | - |                    |                    |                 |
| WQL0095 | N |                    |                    |                 |
| 5C.gif) | o |                    |                    |                 |
| **Color | v |                    |                    |                 |
| imetric | e |                    |                    |                 |
| labcode | m |                    |                    |                 |
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| p       | e |                    |                    |                 |
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| 0       | 2 |                    |                    |                 |
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+---------+---+--------------------+--------------------+-----------------+
|         |   |                    |                    |                 |
+---------+---+--------------------+--------------------+-----------------+
| [**     | * |                    |                    |                 |
| Residue | * |                    |                    |                 |
| on      | D |                    |                    |                 |
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| ration, | t |                    |                    |                 |
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| ered**] | r |                    |                    |                 |
| (http:/ | e |                    |                    |                 |
| /bqs.us | c |                    |                    |                 |
| gs.gov/ | e |                    |                    |                 |
| bsp/QAD | i |                    |                    |                 |
| ATA_all | v |                    |                    |                 |
| /MAY04N | e |                    |                    |                 |
| WQL7030 | d |                    |                    |                 |
| 0A.gif) | s |                    |                    |                 |
| **Grav  | i |                    |                    |                 |
| imetric | n |                    |                    |                 |
| labcode | c |                    |                    |                 |
| 0027    | e |                    |                    |                 |
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+---------+---+--------------------+--------------------+-----------------+
| *P      |   |                    |                    |                 |
| revious |   |                    |                    |                 |
| c       |   |                    |                    |                 |
| omments |   |                    |                    |                 |
| for     |   |                    |                    |                 |
| residue |   |                    |                    |                 |
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| 0027,   |   |                    |                    |                 |
| p       |   |                    |                    |                 |
| armcode |   |                    |                    |                 |
| 70300A* |   |                    |                    |                 |
+---------+---+--------------------+--------------------+-----------------+
| From    | A |                    | Between December   | The balance     |
|         | s |                    | 2003 and February  | communication   |
| >       | l |                    | 2004 the NWQL also | will continue   |
|  QADATA | i |                    | noticed a low bias | to be monitored |
| >       | g |                    | with our on-line   | using on-line   |
| Summary | h |                    | QC for M-162. The  | QC for a        |
| > March | t |                    | blank and M-152    | reoccurrence of |
| > 2004  | n |                    | on-line QC also    | the low bias    |
|         | e |                    | show a very slight |                 |
|         | g |                    | low bias; however, |                 |
|         | a |                    | the bias is not as |                 |
|         | t |                    | evident. The bias  |                 |
|         | i |                    | went away near the |                 |
|         | v |                    | beginning of March |                 |
|         | e |                    | 2004, according to |                 |
|         | b |                    | the M-162 on-line  |                 |
|         | i |                    | QC. All on-line QC |                 |
|         | a |                    | are around the     |                 |
|         | s |                    | expected means as  |                 |
|         | ( |                    | of March 2004.     |                 |
|         | 5 |                    | During this time   |                 |
|         | % |                    | the analyst        |                 |
|         | ) |                    | reported problems  |                 |
|         | h |                    | with the balance   |                 |
|         | a |                    | weight being sent  |                 |
|         | s |                    | to the computer in |                 |
|         | d |                    | a consistent       |                 |
|         | e |                    | manner. The        |                 |
|         | v |                    | balance doors were |                 |
|         | e |                    | adjusted and the   |                 |
|         | l |                    | timing routine was |                 |
|         | o |                    | modified.          |                 |
|         | p |                    |                    |                 |
|         | e |                    |                    |                 |
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|         | 2 |                    |                    |                 |
|         | 0 |                    |                    |                 |
|         | 0 |                    |                    |                 |
|         | 3 |                    |                    |                 |
|         | . |                    |                    |                 |
+---------+---+--------------------+--------------------+-----------------+
|         |   |                    |                    |                 |
+---------+---+--------------------+--------------------+-----------------+

###### Table 2

OWQRL PERFORMANCE ON IBSP SAMPLES

######### **Note: Click the blue, underlined text in the left column to access the control chart for the associated parameter.**

+----------+------------------+---+-----------------+---+-----------------+
| **Trace  | **Problem**      | * |                 | * |                 |
| Metal    |                  | * |                 | * |                 |
| Determin |                  | O |                 | C |                 |
| ations** |                  | W |                 | o |                 |
|          |                  | Q |                 | r |                 |
|          |                  | R |                 | r |                 |
|          |                  | L |                 | e |                 |
|          |                  | * |                 | c |                 |
|          |                  | * |                 | t |                 |
|          |                  |   |                 | i |                 |
|          |                  | * |                 | v |                 |
|          |                  | * |                 | e |                 |
|          |                  | L |                 | * |                 |
|          |                  | a |                 | * |                 |
|          |                  | b |                 |   |                 |
|          |                  | C |                 | * |                 |
|          |                  | o |                 | * |                 |
|          |                  | m |                 | A |                 |
|          |                  | m |                 | c |                 |
|          |                  | e |                 | t |                 |
|          |                  | n |                 | i |                 |
|          |                  | t |                 | o |                 |
|          |                  | * |                 | n |                 |
|          |                  | * |                 | * |                 |
|          |                  |   |                 | * |                 |
+==========+==================+===+=================+===+=================+
| [**      | The most         | * |                 | * |                 |
| Arsenic, | recently         | * |                 | * |                 |
| Who      | received data    | D |                 | C |                 |
| le-Water | indicate that    | u |                 | u |                 |
| Re       | this method is   | e |                 | r |                 |
| coverabl | still            | t |                 | r |                 |
| e**](htt | demonstrating    | o |                 | e |                 |
| p://bqs. | variability      | t |                 | n |                 |
| usgs.gov | beyond           | h |                 | t |                 |
| /bsp/QAD | acceptable       | e |                 | s |                 |
| ATA_all/ | levels. Of the   | p |                 | t |                 |
| MAY04OWQ | last seven       | e |                 | o |                 |
| RL010021 | values received, | n |                 | c |                 |
| .gif)**\ | one has been     | d |                 | k |                 |
| GFAA     | within the       | i |                 | w |                 |
| labcode  | control limits.  | n |                 | a |                 |
| 3119     |                  | g |                 | s |                 |
| parmcode |                  | c |                 | u |                 |
| 1        |                  | l |                 | s |                 |
| 002(1)** |                  | o |                 | e |                 |
|          |                  | s |                 | d |                 |
|          |                  | u |                 | f |                 |
|          |                  | r |                 | o |                 |
|          |                  | e |                 | r |                 |
|          |                  | o |                 | n |                 |
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|          |                  | h |                 | s |                 |
|          |                  | e |                 | t |                 |
|          |                  | l |                 | a |                 |
|          |                  | a |                 | n |                 |
|          |                  | b |                 | d |                 |
|          |                  | o |                 | a |                 |
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|          |                  | a |                 | d |                 |
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|          |                  | o |                 | . |                 |
|          |                  | r |                 | * |                 |
|          |                  | y |                 | * |                 |
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|          |                  | n |                 |   |                 |
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|          |                  | d |                 |   |                 |
|          |                  | s |                 |   |                 |
|          |                  | w |                 |   |                 |
|          |                  | e |                 |   |                 |
|          |                  | r |                 |   |                 |
|          |                  | e |                 |   |                 |
|          |                  | n |                 |   |                 |
|          |                  | o |                 |   |                 |
|          |                  | t |                 |   |                 |
|          |                  | o |                 |   |                 |
|          |                  | r |                 |   |                 |
|          |                  | d |                 |   |                 |
|          |                  | e |                 |   |                 |
|          |                  | r |                 |   |                 |
|          |                  | e |                 |   |                 |
|          |                  | d |                 |   |                 |
|          |                  | . |                 |   |                 |
|          |                  | * |                 |   |                 |
|          |                  | * |                 |   |                 |
+----------+------------------+---+-----------------+---+-----------------+
| *        |                  |   |                 |   |                 |
| Previous |                  |   |                 |   |                 |
| comments |                  |   |                 |   |                 |
| for      |                  |   |                 |   |                 |
| arsenic, |                  |   |                 |   |                 |
| who      |                  |   |                 |   |                 |
| le-water |                  |   |                 |   |                 |
| reco     |                  |   |                 |   |                 |
| verable, |                  |   |                 |   |                 |
| GFAA,    |                  |   |                 |   |                 |
| labcode  |                  |   |                 |   |                 |
| 3119,    |                  |   |                 |   |                 |
| parmcode |                  |   |                 |   |                 |
| 1002(1)* |                  |   |                 |   |                 |
+----------+------------------+---+-----------------+---+-----------------+
| From     | Since October    | T |                 | N |                 |
|          | 2002, data for   | h |                 | e |                 |
| > QADATA | this analytical  | e |                 | w |                 |
| >        | line have        | m |                 | s |                 |
|  Summary | demonstrated     | o |                 | t |                 |
| > March  | variability      | s |                 | a |                 |
| > 2004   | beyond           | t |                 | n |                 |
|          | acceptable       | r |                 | d |                 |
|          | levels. Since    | e |                 | a |                 |
|          | October 2002,    | c |                 | r |                 |
|          | nine out of 28   | e |                 | d |                 |
|          | points (32%) are | n |                 | s |                 |
|          | outside of +/-2  | t |                 | f |                 |
|          | f-pseudosigma    | p |                 | o |                 |
|          | with three of 28 | r |                 | r |                 |
|          | (11%) outside of | o |                 | t |                 |
|          | +/-3             | b |                 | h |                 |
|          | f-pseudosigma.   | l |                 | e |                 |
|          | The most         | e |                 | G |                 |
|          | recently         | m |                 | F |                 |
|          | received data    | s |                 | A |                 |
|          | indicate         | s |                 | A |                 |
|          | continuing       | e |                 | w |                 |
|          | problems with    | e |                 | i |                 |
|          | the method       | m |                 | l |                 |
|          | variability.     | t |                 | l |                 |
|          |                  | o |                 | b |                 |
|          | IBSP recommends  | c |                 | e |                 |
|          | that the source  | o |                 | o |                 |
|          | of the problem   | m |                 | r |                 |
|          | be determined    | e |                 | d |                 |
|          | before releasing | f |                 | e |                 |
|          | any more data    | r |                 | r |                 |
|          | from             | o |                 | e |                 |
|          | environmental    | m |                 | d |                 |
|          | samples.         | t |                 | , |                 |
|          |                  | h |                 | c |                 |
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|          |                  | c |                 | o |                 |
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|          |                  | T |                 | w |                 |
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|          |                  | e |                 | . |                 |
|          |                  | b |                 | A |                 |
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|          |                  | s |                 |   |                 |
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|          |                  | G |                 |   |                 |
|          |                  | F |                 |   |                 |
|          |                  | A |                 |   |                 |
|          |                  | A |                 |   |                 |
|          |                  | . |                 |   |                 |
|          |                  | T |                 |   |                 |
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|          |                  | s |                 |   |                 |
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|          |                  | d |                 |   |                 |
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|          |                  | e |                 |   |                 |
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|          |                  | a |                 |   |                 |
|          |                  | t |                 |   |                 |
|          |                  | r |                 |   |                 |
|          |                  | i |                 |   |                 |
|          |                  | x |                 |   |                 |
|          |                  | m |                 |   |                 |
|          |                  | a |                 |   |                 |
|          |                  | t |                 |   |                 |
|          |                  | c |                 |   |                 |
|          |                  | h |                 |   |                 |
|          |                  | e |                 |   |                 |
|          |                  | d |                 |   |                 |
|          |                  | f |                 |   |                 |
|          |                  | o |                 |   |                 |
|          |                  | r |                 |   |                 |
|          |                  | t |                 |   |                 |
|          |                  | h |                 |   |                 |
|          |                  | e |                 |   |                 |
|          |                  | d |                 |   |                 |
|          |                  | i |                 |   |                 |
|          |                  | g |                 |   |                 |
|          |                  | e |                 |   |                 |
|          |                  | s |                 |   |                 |
|          |                  | t |                 |   |                 |
|          |                  | i |                 |   |                 |
|          |                  | o |                 |   |                 |
|          |                  | n |                 |   |                 |
|          |                  | . |                 |   |                 |
+----------+------------------+---+-----------------+---+-----------------+
| From     | The data still   | S |                 | T |                 |
|          | indicate high    | e |                 | h |                 |
| > QADATA | variability. Two | r |                 | e |                 |
| >        | of the last      | v |                 | G |                 |
|  Summary | seven values     | i |                 | F |                 |
| >        | received (29%)   | c |                 | A |                 |
|  January | are outside of   | e |                 | A |                 |
| > 2004   | +/-2             | a |                 | w |                 |
|          | f-pseudosigma.   | g |                 | a |                 |
|          |                  | r |                 | s |                 |
|          |                  | e |                 | r |                 |
|          |                  | e |                 | e |                 |
|          |                  | m |                 | c |                 |
|          |                  | e |                 | e |                 |
|          |                  | n |                 | n |                 |
|          |                  | t |                 | t |                 |
|          |                  | d |                 | l |                 |
|          |                  | i |                 | y |                 |
|          |                  | s |                 | s |                 |
|          |                  | c |                 | e |                 |
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|          |                  | . |                 | e |                 |
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|          |                  |   |                 | . |                 |
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|          |                  |   |                 | s |                 |
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|          |                  |   |                 | u |                 |
|          |                  |   |                 | m |                 |
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|          |                  |   |                 | n |                 |
|          |                  |   |                 | t |                 |
|          |                  |   |                 | d |                 |
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|          |                  |   |                 | n |                 |
|          |                  |   |                 | o |                 |
|          |                  |   |                 | t |                 |
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|          |                  |   |                 | c |                 |
|          |                  |   |                 | u |                 |
|          |                  |   |                 | r |                 |
|          |                  |   |                 | . |                 |
+----------+------------------+---+-----------------+---+-----------------+
| From     | High variability | D |                 | T |                 |
|          | is still         | u |                 | h |                 |
| QADATA   | demonstrated.    | e |                 | e |                 |
| Summary  | Three of the     | t |                 | c |                 |
| Nov 2003 | last seven       | o |                 | o |                 |
|          | values received  | f |                 | s |                 |
|          | (43%) are        | a |                 | t |                 |
|          | outside of +/-2  | c |                 | r |                 |
|          | f-pseudosigma.   | t |                 | e |                 |
|          |                  | o |                 | d |                 |
|          |                  | r |                 | u |                 |
|          |                  | s |                 | c |                 |
|          |                  | b |                 | t |                 |
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|          |                  | f |                 | . |                 |
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|          |                  | e |                 |   |                 |
|          |                  | f |                 |   |                 |
|          |                  | i |                 |   |                 |
|          |                  | c |                 |   |                 |
|          |                  | i |                 |   |                 |
|          |                  | e |                 |   |                 |
|          |                  | n |                 |   |                 |
|          |                  | c |                 |   |                 |
|          |                  | i |                 |   |                 |
|          |                  | e |                 |   |                 |
|          |                  | s |                 |   |                 |
|          |                  | o |                 |   |                 |
|          |                  | v |                 |   |                 |
|          |                  | e |                 |   |                 |
|          |                  | r |                 |   |                 |
|          |                  | t |                 |   |                 |
|          |                  | i |                 |   |                 |
|          |                  | m |                 |   |                 |
|          |                  | e |                 |   |                 |
|          |                  | i |                 |   |                 |
|          |                  | n |                 |   |                 |
|          |                  | t |                 |   |                 |
|          |                  | h |                 |   |                 |
|          |                  | e |                 |   |                 |
|          |                  | t |                 |   |                 |
|          |                  | r |                 |   |                 |
|          |                  | a |                 |   |                 |
|          |                  | c |                 |   |                 |
|          |                  | e |                 |   |                 |
|          |                  | m |                 |   |                 |
|          |                  | e |                 |   |                 |
|          |                  | t |                 |   |                 |
|          |                  | a |                 |   |                 |
|          |                  | l |                 |   |                 |
|          |                  | s |                 |   |                 |
|          |                  | s |                 |   |                 |
|          |                  | e |                 |   |                 |
|          |                  | c |                 |   |                 |
|          |                  | t |                 |   |                 |
|          |                  | i |                 |   |                 |
|          |                  | o |                 |   |                 |
|          |                  | n |                 |   |                 |
|          |                  | . |                 |   |                 |
+----------+------------------+---+-----------------+---+-----------------+
| From     | The most         | P |                 | A |                 |
|          | recently         | r |                 | l |                 |
| QADATA   | received data    | o |                 | l |                 |
| Summary  | indicate         | b |                 | o |                 |
| Sept     | on-going         | l |                 | f |                 |
| 2003     | problems with    | e |                 | o |                 |
|          | variability and  | m |                 | u |                 |
|          | a positive bias. | s |                 | r |                 |
|          |                  | w |                 | l |                 |
|          | Since October    | i |                 | a |                 |
|          | 2002, five out   | t |                 | m |                 |
|          | of 19 points     | h |                 | p |                 |
|          | (26%) are        | l |                 | p |                 |
|          | outside of +/-2  | o |                 | o |                 |
|          | f-pseudosigma    | w |                 | w |                 |
|          | with 3 of 19     | e |                 | e |                 |
|          | (16%) outside    | n |                 | r |                 |
|          | of\              | e |                 | s |                 |
|          | +/-3 f-          | r |                 | u |                 |
|          | pseudosigma.     | g |                 | p |                 |
|          |                  | y |                 | p |                 |
|          |                  | f |                 | l |                 |
|          |                  | r |                 | i |                 |
|          |                  | o |                 | e |                 |
|          |                  | m |                 | s |                 |
|          |                  | t |                 | f |                 |
|          |                  | h |                 | o |                 |
|          |                  | e |                 | r |                 |
|          |                  | A |                 | t |                 |
|          |                  | r |                 | h |                 |
|          |                  | s |                 | e |                 |
|          |                  | e |                 | g |                 |
|          |                  | n |                 | r |                 |
|          |                  | i |                 | a |                 |
|          |                  | c |                 | p |                 |
|          |                  | l |                 | h |                 |
|          |                  | a |                 | i |                 |
|          |                  | m |                 | t |                 |
|          |                  | p |                 | e |                 |
|          |                  | h |                 | f |                 |
|          |                  | a |                 | u |                 |
|          |                  | v |                 | r |                 |
|          |                  | e |                 | n |                 |
|          |                  | l |                 | a |                 |
|          |                  | e |                 | c |                 |
|          |                  | d |                 | e |                 |
|          |                  | t |                 | h |                 |
|          |                  | o |                 | a |                 |
|          |                  | i |                 | v |                 |
|          |                  | n |                 | e |                 |
|          |                  | c |                 | b |                 |
|          |                  | r |                 | e |                 |
|          |                  | e |                 | e |                 |
|          |                  | a |                 | n |                 |
|          |                  | s |                 | e |                 |
|          |                  | e |                 | v |                 |
|          |                  | d |                 | a |                 |
|          |                  | v |                 | l |                 |
|          |                  | a |                 | u |                 |
|          |                  | r |                 | a |                 |
|          |                  | i |                 | t |                 |
|          |                  | a |                 | e |                 |
|          |                  | b |                 | d |                 |
|          |                  | i |                 | a |                 |
|          |                  | l |                 | n |                 |
|          |                  | i |                 | d |                 |
|          |                  | t |                 | t |                 |
|          |                  | y |                 | h |                 |
|          |                  | a |                 | o |                 |
|          |                  | n |                 | s |                 |
|          |                  | d |                 | e |                 |
|          |                  | d |                 | t |                 |
|          |                  | e |                 | h |                 |
|          |                  | c |                 | a |                 |
|          |                  | r |                 | t |                 |
|          |                  | e |                 | n |                 |
|          |                  | a |                 | e |                 |
|          |                  | s |                 | e |                 |
|          |                  | e |                 | d |                 |
|          |                  | d |                 | t |                 |
|          |                  | s |                 | o |                 |
|          |                  | e |                 | b |                 |
|          |                  | n |                 | e |                 |
|          |                  | s |                 | r |                 |
|          |                  | i |                 | e |                 |
|          |                  | t |                 | p |                 |
|          |                  | i |                 | l |                 |
|          |                  | v |                 | a |                 |
|          |                  | i |                 | c |                 |
|          |                  | t |                 | e |                 |
|          |                  | y |                 | d |                 |
|          |                  | . |                 | h |                 |
|          |                  |   |                 | a |                 |
|          |                  |   |                 | v |                 |
|          |                  |   |                 | e |                 |
|          |                  |   |                 | b |                 |
|          |                  |   |                 | e |                 |
|          |                  |   |                 | e |                 |
|          |                  |   |                 | n |                 |
|          |                  |   |                 | i |                 |
|          |                  |   |                 | d |                 |
|          |                  |   |                 | e |                 |
|          |                  |   |                 | n |                 |
|          |                  |   |                 | t |                 |
|          |                  |   |                 | i |                 |
|          |                  |   |                 | f |                 |
|          |                  |   |                 | i |                 |
|          |                  |   |                 | e |                 |
|          |                  |   |                 | d |                 |
|          |                  |   |                 | . |                 |
|          |                  |   |                 | T |                 |
|          |                  |   |                 | h |                 |
|          |                  |   |                 | e |                 |
|          |                  |   |                 | i |                 |
|          |                  |   |                 | n |                 |
|          |                  |   |                 | s |                 |
|          |                  |   |                 | t |                 |
|          |                  |   |                 | r |                 |
|          |                  |   |                 | u |                 |
|          |                  |   |                 | m |                 |
|          |                  |   |                 | e |                 |
|          |                  |   |                 | n |                 |
|          |                  |   |                 | t |                 |
|          |                  |   |                 | i |                 |
|          |                  |   |                 | s |                 |
|          |                  |   |                 | a |                 |
|          |                  |   |                 | l |                 |
|          |                  |   |                 | s |                 |
|          |                  |   |                 | o |                 |
|          |                  |   |                 | c |                 |
|          |                  |   |                 | u |                 |
|          |                  |   |                 | r |                 |
|          |                  |   |                 | r |                 |
|          |                  |   |                 | e |                 |
|          |                  |   |                 | n |                 |
|          |                  |   |                 | t |                 |
|          |                  |   |                 | l |                 |
|          |                  |   |                 | y |                 |
|          |                  |   |                 | b |                 |
|          |                  |   |                 | e |                 |
|          |                  |   |                 | i |                 |
|          |                  |   |                 | n |                 |
|          |                  |   |                 | g |                 |
|          |                  |   |                 | r |                 |
|          |                  |   |                 | u |                 |
|          |                  |   |                 | n |                 |
|          |                  |   |                 | i |                 |
|          |                  |   |                 | n |                 |
|          |                  |   |                 | t |                 |
|          |                  |   |                 | h |                 |
|          |                  |   |                 | e |                 |
|          |                  |   |                 | s |                 |
|          |                  |   |                 | i |                 |
|          |                  |   |                 | n |                 |
|          |                  |   |                 | g |                 |
|          |                  |   |                 | l |                 |
|          |                  |   |                 | e |                 |
|          |                  |   |                 | r |                 |
|          |                  |   |                 | a |                 |
|          |                  |   |                 | t |                 |
|          |                  |   |                 | h |                 |
|          |                  |   |                 | e |                 |
|          |                  |   |                 | r |                 |
|          |                  |   |                 | t |                 |
|          |                  |   |                 | h |                 |
|          |                  |   |                 | a |                 |
|          |                  |   |                 | n |                 |
|          |                  |   |                 | m |                 |
|          |                  |   |                 | u |                 |
|          |                  |   |                 | l |                 |
|          |                  |   |                 | t |                 |
|          |                  |   |                 | i |                 |
|          |                  |   |                 | - |                 |
|          |                  |   |                 | e |                 |
|          |                  |   |                 | l |                 |
|          |                  |   |                 | e |                 |
|          |                  |   |                 | m |                 |
|          |                  |   |                 | e |                 |
|          |                  |   |                 | n |                 |
|          |                  |   |                 | t |                 |
|          |                  |   |                 | m |                 |
|          |                  |   |                 | o |                 |
|          |                  |   |                 | d |                 |
|          |                  |   |                 | e |                 |
|          |                  |   |                 | t |                 |
|          |                  |   |                 | o |                 |
|          |                  |   |                 | h |                 |
|          |                  |   |                 | e |                 |
|          |                  |   |                 | l |                 |
|          |                  |   |                 | p |                 |
|          |                  |   |                 | i |                 |
|          |                  |   |                 | n |                 |
|          |                  |   |                 | c |                 |
|          |                  |   |                 | r |                 |
|          |                  |   |                 | e |                 |
|          |                  |   |                 | a |                 |
|          |                  |   |                 | s |                 |
|          |                  |   |                 | e |                 |
|          |                  |   |                 | s |                 |
|          |                  |   |                 | e |                 |
|          |                  |   |                 | n |                 |
|          |                  |   |                 | s |                 |
|          |                  |   |                 | i |                 |
|          |                  |   |                 | t |                 |
|          |                  |   |                 | i |                 |
|          |                  |   |                 | v |                 |
|          |                  |   |                 | i |                 |
|          |                  |   |                 | t |                 |
|          |                  |   |                 | y |                 |
|          |                  |   |                 | a |                 |
|          |                  |   |                 | n |                 |
|          |                  |   |                 | d |                 |
|          |                  |   |                 | d |                 |
|          |                  |   |                 | e |                 |
|          |                  |   |                 | c |                 |
|          |                  |   |                 | r |                 |
|          |                  |   |                 | e |                 |
|          |                  |   |                 | a |                 |
|          |                  |   |                 | s |                 |
|          |                  |   |                 | e |                 |
|          |                  |   |                 | t |                 |
|          |                  |   |                 | h |                 |
|          |                  |   |                 | e |                 |
|          |                  |   |                 | v |                 |
|          |                  |   |                 | a |                 |
|          |                  |   |                 | r |                 |
|          |                  |   |                 | i |                 |
|          |                  |   |                 | a |                 |
|          |                  |   |                 | b |                 |
|          |                  |   |                 | i |                 |
|          |                  |   |                 | l |                 |
|          |                  |   |                 | i |                 |
|          |                  |   |                 | t |                 |
|          |                  |   |                 | y |                 |
|          |                  |   |                 | . |                 |
+----------+------------------+---+-----------------+---+-----------------+
| From     | The two new      | T |                 | W |                 |
|          | values received  | h |                 | e |                 |
| QADATA   | since the last   | e |                 | w |                 |
| Summary  | QADATA Summary   | p |                 | i |                 |
| July     | are both within\ | r |                 | l |                 |
| 2003     | one              | o |                 | l |                 |
|          | f-pseudosigma of | b |                 | c |                 |
|          | the median.      | l |                 | o |                 |
|          |                  | e |                 | n |                 |
|          | Analysis should  | m |                 | t |                 |
|          | be closely       | s |                 | i |                 |
|          | monitored until  | w |                 | n |                 |
|          | the next QADATA  | i |                 | u |                 |
|          | Summary is       | t |                 | e |                 |
|          | distributed.     | h |                 | t |                 |
|          |                  | t |                 | o |                 |
|          |                  | h |                 | m |                 |
|          |                  | e |                 | o |                 |
|          |                  | G |                 | n |                 |
|          |                  | F |                 | i |                 |
|          |                  | A |                 | t |                 |
|          |                  | A |                 | o |                 |
|          |                  | a |                 | r |                 |
|          |                  | t |                 | t |                 |
|          |                  | l |                 | h |                 |
|          |                  | o |                 | e |                 |
|          |                  | w |                 | G |                 |
|          |                  | w |                 | F |                 |
|          |                  | a |                 | A |                 |
|          |                  | v |                 | A |                 |
|          |                  | e |                 | c |                 |
|          |                  | l |                 | l |                 |
|          |                  | e |                 | o |                 |
|          |                  | n |                 | s |                 |
|          |                  | g |                 | e |                 |
|          |                  | t |                 | l |                 |
|          |                  | h |                 | y |                 |
|          |                  | s |                 | t |                 |
|          |                  | h |                 | o |                 |
|          |                  | a |                 | b |                 |
|          |                  | v |                 | e |                 |
|          |                  | e |                 | s |                 |
|          |                  | b |                 | u |                 |
|          |                  | e |                 | r |                 |
|          |                  | e |                 | e |                 |
|          |                  | n |                 | t |                 |
|          |                  | c |                 | h |                 |
|          |                  | o |                 | a |                 |
|          |                  | r |                 | t |                 |
|          |                  | r |                 | t |                 |
|          |                  | e |                 | h |                 |
|          |                  | c |                 | e |                 |
|          |                  | t |                 | p |                 |
|          |                  | e |                 | r |                 |
|          |                  | d |                 | o |                 |
|          |                  | . |                 | b |                 |
|          |                  |   |                 | l |                 |
|          |                  |   |                 | e |                 |
|          |                  |   |                 | m |                 |
|          |                  |   |                 | s |                 |
|          |                  |   |                 | d |                 |
|          |                  |   |                 | o |                 |
|          |                  |   |                 | n |                 |
|          |                  |   |                 | o |                 |
|          |                  |   |                 | t |                 |
|          |                  |   |                 | r |                 |
|          |                  |   |                 | e |                 |
|          |                  |   |                 | a |                 |
|          |                  |   |                 | p |                 |
|          |                  |   |                 | p |                 |
|          |                  |   |                 | e |                 |
|          |                  |   |                 | a |                 |
|          |                  |   |                 | r |                 |
|          |                  |   |                 | . |                 |
+----------+------------------+---+-----------------+---+-----------------+
| From     | The variability  | W |                 | M |                 |
|          | is beyond        | e |                 | o |                 |
| QADATA   | acceptable       | w |                 | r |                 |
| Summary  | levels. IBSP     | i |                 | e |                 |
| May 2003 | recommends that  | l |                 | s |                 |
|          | the source of    | l |                 | e |                 |
|          | the problem be   | b |                 | r |                 |
|          | determined       | e |                 | v |                 |
|          | before any more  | r |                 | i |                 |
|          | analyses of      | u |                 | c |                 |
|          | environmental    | n |                 | e |                 |
|          | samples are      | n |                 | w |                 |
|          | performed.       | i |                 | o |                 |
|          |                  | n |                 | r |                 |
|          | Since October    | g |                 | k |                 |
|          | 2002, four out   | a |                 | w |                 |
|          | of 13 points     | n |                 | a |                 |
|          | (31%) are        | e |                 | s |                 |
|          | outside of +/-2  | w |                 | d |                 |
|          | f-pseudosigma    | D |                 | o |                 |
|          | with 3 of 13     | e |                 | n |                 |
|          | (23%) outside    | m |                 | e |                 |
|          | of\              | o |                 | t |                 |
|          | +/-3             | n |                 | o |                 |
|          | f-pseudosigma.   | s |                 | c |                 |
|          |                  | t |                 | o |                 |
|          |                  | r |                 | r |                 |
|          |                  | a |                 | r |                 |
|          |                  | t |                 | e |                 |
|          |                  | i |                 | c |                 |
|          |                  | o |                 | t |                 |
|          |                  | n |                 | p |                 |
|          |                  | o |                 | r |                 |
|          |                  | f |                 | o |                 |
|          |                  | C |                 | b |                 |
|          |                  | a |                 | l |                 |
|          |                  | p |                 | e |                 |
|          |                  | a |                 | m |                 |
|          |                  | b |                 | s |                 |
|          |                  | i |                 | w |                 |
|          |                  | l |                 | i |                 |
|          |                  | i |                 | t |                 |
|          |                  | t |                 | h |                 |
|          |                  | y |                 | t |                 |
|          |                  | f |                 | h |                 |
|          |                  | o |                 | e |                 |
|          |                  | r |                 | G |                 |
|          |                  | A |                 | F |                 |
|          |                  | r |                 | A |                 |
|          |                  | s |                 | A |                 |
|          |                  | e |                 | . |                 |
|          |                  | n |                 | P |                 |
|          |                  | i |                 | a |                 |
|          |                  | c |                 | s |                 |
|          |                  | b |                 | t |                 |
|          |                  | e |                 | s |                 |
|          |                  | f |                 | a |                 |
|          |                  | o |                 | m |                 |
|          |                  | r |                 | p |                 |
|          |                  | e |                 | l |                 |
|          |                  | a |                 | e |                 |
|          |                  | n |                 | s |                 |
|          |                  | y |                 | h |                 |
|          |                  | m |                 | a |                 |
|          |                  | o |                 | v |                 |
|          |                  | r |                 | e |                 |
|          |                  | e |                 | b |                 |
|          |                  | s |                 | e |                 |
|          |                  | a |                 | e |                 |
|          |                  | m |                 | n |                 |
|          |                  | p |                 | c |                 |
|          |                  | l |                 | h |                 |
|          |                  | e |                 | e |                 |
|          |                  | s |                 | c |                 |
|          |                  | a |                 | k |                 |
|          |                  | r |                 | e |                 |
|          |                  | e |                 | d |                 |
|          |                  | a |                 | b |                 |
|          |                  | n |                 | y |                 |
|          |                  | a |                 | o |                 |
|          |                  | l |                 | t |                 |
|          |                  | y |                 | h |                 |
|          |                  | z |                 | e |                 |
|          |                  | e |                 | r |                 |
|          |                  | d |                 | t |                 |
|          |                  | . |                 | e |                 |
|          |                  |   |                 | c |                 |
|          |                  |   |                 | h |                 |
|          |                  |   |                 | n |                 |
|          |                  |   |                 | i |                 |
|          |                  |   |                 | q |                 |
|          |                  |   |                 | u |                 |
|          |                  |   |                 | e |                 |
|          |                  |   |                 | s |                 |
|          |                  |   |                 | ( |                 |
|          |                  |   |                 | I |                 |
|          |                  |   |                 | C |                 |
|          |                  |   |                 | P |                 |
|          |                  |   |                 | , |                 |
|          |                  |   |                 | I |                 |
|          |                  |   |                 | C |                 |
|          |                  |   |                 | P |                 |
|          |                  |   |                 | / |                 |
|          |                  |   |                 | M |                 |
|          |                  |   |                 | S |                 |
|          |                  |   |                 | ) |                 |
|          |                  |   |                 | t |                 |
|          |                  |   |                 | o |                 |
|          |                  |   |                 | m |                 |
|          |                  |   |                 | a |                 |
|          |                  |   |                 | k |                 |
|          |                  |   |                 | e |                 |
|          |                  |   |                 | s |                 |
|          |                  |   |                 | u |                 |
|          |                  |   |                 | r |                 |
|          |                  |   |                 | e |                 |
|          |                  |   |                 | t |                 |
|          |                  |   |                 | h |                 |
|          |                  |   |                 | a |                 |
|          |                  |   |                 | t |                 |
|          |                  |   |                 | v |                 |
|          |                  |   |                 | a |                 |
|          |                  |   |                 | l |                 |
|          |                  |   |                 | u |                 |
|          |                  |   |                 | e |                 |
|          |                  |   |                 | s |                 |
|          |                  |   |                 | r |                 |
|          |                  |   |                 | e |                 |
|          |                  |   |                 | p |                 |
|          |                  |   |                 | o |                 |
|          |                  |   |                 | r |                 |
|          |                  |   |                 | t |                 |
|          |                  |   |                 | e |                 |
|          |                  |   |                 | d |                 |
|          |                  |   |                 | a |                 |
|          |                  |   |                 | r |                 |
|          |                  |   |                 | e |                 |
|          |                  |   |                 | c |                 |
|          |                  |   |                 | o |                 |
|          |                  |   |                 | r |                 |
|          |                  |   |                 | r |                 |
|          |                  |   |                 | e |                 |
|          |                  |   |                 | c |                 |
|          |                  |   |                 | t |                 |
|          |                  |   |                 | . |                 |
+----------+------------------+---+-----------------+---+-----------------+
| From     | High variability | A |                 | S |                 |
|          | is still         | p |                 | e |                 |
| QADATA   | exhibited. Since | r |                 | r |                 |
| Summary  | late October     | o |                 | v |                 |
| March    | 2002, three out  | b |                 | i |                 |
| 2003     | of 9 points      | l |                 | c |                 |
|          | (33%) are        | e |                 | e |                 |
|          | outside of +/-2  | m |                 | w |                 |
|          | f-pseudosigma.   | w |                 | a |                 |
|          |                  | i |                 | s |                 |
|          |                  | t |                 | p |                 |
|          |                  | h |                 | e |                 |
|          |                  | t |                 | r |                 |
|          |                  | h |                 | f |                 |
|          |                  | e |                 | o |                 |
|          |                  | b |                 | r |                 |
|          |                  | e |                 | m |                 |
|          |                  | a |                 | e |                 |
|          |                  | m |                 | d |                 |
|          |                  | c |                 | o |                 |
|          |                  | o |                 | n |                 |
|          |                  | m |                 | t |                 |
|          |                  | b |                 | h |                 |
|          |                  | i |                 | e |                 |
|          |                  | n |                 | A |                 |
|          |                  | e |                 | A |                 |
|          |                  | r |                 | t |                 |
|          |                  | o |                 | o |                 |
|          |                  | n |                 | c |                 |
|          |                  | t |                 | o |                 |
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+----------+------------------+---+-----------------+---+-----------------+
| From     | Increased        | P |                 | A |                 |
|          | variability      | r |                 | m |                 |
| QADATA   | starting late    | o |                 | o |                 |
| Summary  | October 2002.    | b |                 | u |                 |
| January  |                  | l |                 | n |                 |
| 2003     |                  | e |                 | t |                 |
|          |                  | m |                 | o |                 |
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+----------+------------------+---+-----------------+---+-----------------+
|          |                  |   |                 |   |                 |
+----------+------------------+---+-----------------+---+-----------------+
| [**T     | **As of January  | * |                 | * |                 |
| hallium, | 2004 results     | * |                 | * |                 |
| Who      | indicate a       | P |                 | C |                 |
| le-Water | negative bias    | r |                 | u |                 |
| Re       | (22%). This bias | o |                 | r |                 |
| coverabl | is not evident   | b |                 | r |                 |
| e**](htt | for other        | l |                 | e |                 |
| p://bqs. | methods          | e |                 | n |                 |
| usgs.gov | analyzing for    | m |                 | t |                 |
| /bsp/QAD | thallium.**      | s |                 | s |                 |
| ATA_all/ |                  | w |                 | t |                 |
| MAY04OWQ |                  | i |                 | o |                 |
| RL010590 |                  | t |                 | c |                 |
| .gif)**\ |                  | h |                 | k |                 |
| GFAA     |                  | T |                 | w |                 |
| labcode  |                  | l |                 | a |                 |
| 3131     |                  | s |                 | s |                 |
| parmcode |                  | t |                 | u |                 |
| 1        |                  | a |                 | s |                 |
| 059(0)** |                  | n |                 | e |                 |
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+----------+------------------+---+-----------------+---+-----------------+
|          |                  |   |                 |   |                 |
+----------+------------------+---+-----------------+---+-----------------+