##### QADATA Summary -- July 2003

The Inorganic Blind Sample Project (IBSP) reviews 95 inorganic
analytical lines at the National Water Quality Laboratory (NWQL) and 84
inorganic analytical lines at the Ocala Water Quality and Research
Laboratory (OWQRL) using double-blind, quality-assurance samples. The
QADATA Summary is a short summary of only those analytical lines for
which the quality-assurance 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 11/15/02 through 06/20/03;
however, longer-range charts are shown when they add clarity to the
problem. The attached quality-assurance 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. Thus, any factors that affect the districts' data should
also affect the data shown in the IBSP quality-assurance 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 deteriorated or are known to
have been affected by a problem at IBSP 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.

Charts containing all data received as of 07/07/03 may be accessed at
<http://bqs.usgs.gov/bsp/WY03charts.htm>. Lab personnel and customers
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/mainpage.html> (select QADATA Application
button). Charts pertaining specifically to this report can be accessed
by following the blue, 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

Ammonia, Filtered, Colorimetric, Labcode 1976, Parmcode 0608F . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . 3

Orthophosphate, Filtered, Colorimetric, Labcode 1974, Parmcode 0671H . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . 3

Barium, Whole-Water Recoverable, ICP, Labcode 2352, Parmcode 1007C . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . 4

**Cadmium, Whole-Water Recoverable,** GFAA, Labcode 1555, Parmcode 1027F
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . 5

Cadmium, Filtered, ICP-MS, Labcode 1788, Parmcode 1025G . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . 5

Lead, Filtered, GFAA, Labcode 1560, Parmcode 1049F . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . 6

Lead, Whole Water Recoverable, GFAA, Labcode 1561, Parmcode 1051F . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . 6

Strontium, Filtered, ICP, Labcode 0652, Parmcode 1080B . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . 6

Calcium, Filtered, ICP, Labcode 0659, Parmcode 0915D . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . 7

**OWQRL**

Analyte Page

**Arsenic, Whole Water Recoverable,** GFAA, Labcode 3119, Parmcode
1002(1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . 8

**Barium, Filtered,** ICP, Labcode 3002, Parmcode 1005(4) . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . 8

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.**

+----------+-----------------+---+-------------------+-------------------+
| **       | **Problem**     | * |                   | **Corrective**    |
| Nutrient |                 | * |                   |                   |
| Determin |                 | N |                   | **Action**        |
| ations** |                 | W |                   |                   |
|          |                 | Q |                   |                   |
|          |                 | L |                   |                   |
|          |                 | * |                   |                   |
|          |                 | * |                   |                   |
|          |                 |   |                   |                   |
|          |                 | * |                   |                   |
|          |                 | * |                   |                   |
|          |                 | L |                   |                   |
|          |                 | a |                   |                   |
|          |                 | b |                   |                   |
|          |                 | C |                   |                   |
|          |                 | o |                   |                   |
|          |                 | m |                   |                   |
|          |                 | m |                   |                   |
|          |                 | e |                   |                   |
|          |                 | n |                   |                   |
|          |                 | t |                   |                   |
|          |                 | * |                   |                   |
|          |                 | * |                   |                   |
+==========+=================+===+===================+===================+
| [        | **The low bias  | * |                   | **The NWQL will   |
| Ammonia, | demonstrated    | * |                   | continue to       |
| F        | during March    | N |                   | monitor the IBSP  |
| iltered] | 2003 has        | o |                   | control charts    |
| (http:// | progressively   | n |                   | for this          |
| bqs.usgs | improved        | e |                   | parameter.**      |
| .gov/bsp | throughout      | n |                   |                   |
| /QADATA_ | April.**        | e |                   |                   |
| all/JUL0 |                 | e |                   |                   |
| 3NWQL006 | **No corrective | d |                   |                   |
| 08F.gif) | action          | e |                   |                   |
|          | necessary.**    | d |                   |                   |
| **Colori |                 | . |                   |                   |
| metric** |                 | * |                   |                   |
|          |                 | * |                   |                   |
| labcode  |                 |   |                   |                   |
| 1976     |                 |   |                   |                   |
| parmcode |                 |   |                   |                   |
| 0608F    |                 |   |                   |                   |
+----------+-----------------+---+-------------------+-------------------+
| *        |                 |   |                   |                   |
| Previous |                 |   |                   |                   |
| comments |                 |   |                   |                   |
| for      |                 |   |                   |                   |
| ammonia, |                 |   |                   |                   |
| f        |                 |   |                   |                   |
| iltered, |                 |   |                   |                   |
| labcode  |                 |   |                   |                   |
| 1976,    |                 |   |                   |                   |
| parmcode |                 |   |                   |                   |
| 0608F*   |                 |   |                   |                   |
+----------+-----------------+---+-------------------+-------------------+
| From     | A negative bias | T |                   | The Nutrients     |
|          | has developed   | h |                   | Unit is           |
| > QADATA | that started in | e |                   | investigating the |
| >        | March 2003.     | l |                   | cause of the      |
|  Summary | This bias is    | o |                   | bias. A new       |
| > May    | not shown by    | w |                   | reference sample  |
| > 2003   | the OWQRL.      | b |                   | will be prepared  |
|          |                 | i |                   | that is near the  |
|          |                 | a |                   | concentration of  |
|          |                 | s |                   | NS10 for on-line  |
|          |                 | e |                   | monitoring. The   |
|          |                 | v |                   | NWQL will         |
|          |                 | i |                   | continue to       |
|          |                 | d |                   | monitor the       |
|          |                 | e |                   | on-line and IBSP  |
|          |                 | n |                   | charts for this   |
|          |                 | t |                   | parameter and     |
|          |                 | i |                   | look for          |
|          |                 | n |                   | corrective        |
|          |                 | M |                   | actions if        |
|          |                 | a |                   | indicated.        |
|          |                 | r |                   |                   |
|          |                 | c |                   |                   |
|          |                 | h |                   |                   |
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|          |                 | . |                   |                   |
+----------+-----------------+---+-------------------+-------------------+
|          |                 |   |                   |                   |
+----------+-----------------+---+-------------------+-------------------+
| [Orthoph | **Over the last | * |                   | **The Nutrients   |
| osphate, | two months      | * |                   | Unit will         |
| F        | (April and May  | V |                   | continue to run   |
| iltered] | 2003) results   | a |                   | NIST samples and  |
| (http:// | for NS10 show   | l |                   | monitor the IBSP  |
| bqs.usgs | improvement     | u |                   | charts.**         |
| .gov/bsp | relative to     | e |                   |                   |
| /QADATA_ | earlier data.** | s |                   |                   |
| all/JUL0 |                 | f |                   |                   |
| 3NWQL006 | **Analysis      | o |                   |                   |
| 71H.gif) | should be       | r |                   |                   |
|          | closely         | N |                   |                   |
| **Colo   | monitored to    | 7 |                   |                   |
| rimetric | ensure values   | 7 |                   |                   |
| labcode  | stay within\    | a |                   |                   |
| 1974     | +/- 2           | n |                   |                   |
| parmcode | f               | d |                   |                   |
| 0671H**  | -pseudosigma.** | N |                   |                   |
|          |                 | 7 |                   |                   |
|          |                 | 8 |                   |                   |
|          |                 | a |                   |                   |
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+----------+-----------------+---+-------------------+-------------------+
| *        |                 |   |                   |                   |
| Previous |                 |   |                   |                   |
| comments |                 |   |                   |                   |
| for      |                 |   |                   |                   |
| orthoph  |                 |   |                   |                   |
| osphate, |                 |   |                   |                   |
| f        |                 |   |                   |                   |
| iltered, |                 |   |                   |                   |
| labcode  |                 |   |                   |                   |
| 1974,    |                 |   |                   |                   |
| parmcode |                 |   |                   |                   |
| 0671H*   |                 |   |                   |                   |
+----------+-----------------+---+-------------------+-------------------+
| From     | N76 has been    | T |                   | The Nutrients     |
|          | replaced by a   | h |                   | Unit will         |
| > QADATA | new matrix      | e |                   | continue to       |
| >        | (N78) which now | N |                   | analyze NIST      |
|  Summary | indicates that  | I |                   | samples in        |
| > May    | this line has   | S |                   | addition to the   |
| > 2003   | improved        | T |                   | on-line QC        |
|          | variability.    | c |                   | samples. The      |
|          | However, for    | e |                   | results from      |
|          | the past two    | r |                   | these samples and |
|          | months, about   | t |                   | the IBSP results  |
|          | 50% of the\     | i |                   | will continue to  |
|          | data for NS10   | f |                   | be monitored.     |
|          | are outside of\ | i |                   |                   |
|          | -2              | e |                   |                   |
|          | f-pseudosigma,  | d |                   |                   |
|          | whereas for the | r |                   |                   |
|          | OWQRL no data   | e |                   |                   |
|          | for NS10 are    | f |                   |                   |
|          | outside of 2    | e |                   |                   |
|          | f-pseudosigma.  | r |                   |                   |
|          |                 | e |                   |                   |
|          |                 | n |                   |                   |
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|          |                 | t |                   |                   |
|          |                 | h |                   |                   |
|          |                 | a |                   |                   |
|          |                 | t |                   |                   |
|          |                 | w |                   |                   |
|          |                 | e |                   |                   |
|          |                 | r |                   |                   |
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|          |                 | c |                   |                   |
|          |                 | l |                   |                   |
|          |                 | o |                   |                   |
|          |                 | s |                   |                   |
|          |                 | e |                   |                   |
|          |                 | t |                   |                   |
|          |                 | o |                   |                   |
|          |                 | t |                   |                   |
|          |                 | h |                   |                   |
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|          |                 | r |                   |                   |
|          |                 | e |                   |                   |
|          |                 | g |                   |                   |
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|          |                 | l |                   |                   |
|          |                 | a |                   |                   |
|          |                 | r |                   |                   |
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|          |                 | . |                   |                   |
+----------+-----------------+---+-------------------+-------------------+
|          |                 |   |                   |                   |
+----------+-----------------+---+-------------------+-------------------+

+---------+---+------------------+-------------------+-------------------+
| **Trace | * |                  | **NWQL**          | **Corrective**    |
| Metal   | * |                  |                   |                   |
| De      | P |                  | **Lab Comment**   | **Action**        |
| termina | r |                  |                   |                   |
| tions** | o |                  |                   |                   |
|         | b |                  |                   |                   |
|         | l |                  |                   |                   |
|         | e |                  |                   |                   |
|         | m |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+=========+===+==================+===================+===================+
| [**     | * |                  | **The NWQL agrees | **The NWQL will   |
| Barium, | * |                  | with IBSP that    | continue to       |
| Whol    | T |                  | the barium bias   | monitor the       |
| e-Water | h |                  | is getting worse. | barium WWR line   |
| Recover | e |                  | New ICP           | on the different  |
| able**] | h |                  | instrumentation   | instrument to see |
| (http:/ | i |                  | has come online   | if there is an    |
| /bqs.us | s |                  | for the dissolved | improvement. The  |
| gs.gov/ | t |                  | line.**           | ICP WWR method    |
| bsp/QAD | o |                  |                   | has been moved to |
| ATA_all | r |                  |                   | a different       |
| /JUL03N | i |                  |                   | instrument that   |
| WQL0100 | c |                  |                   | has had recent    |
| 7C.gif) | a |                  |                   | maintenance. We   |
| **ICP** | l |                  |                   | will reanalyze    |
|         | n |                  |                   | IBSP samples on   |
| **      | e |                  |                   | the this          |
| labcode | g |                  |                   | instrumentation.  |
| 2352**  | a |                  |                   | We plan to have   |
|         | t |                  |                   | the new Perkin    |
| **p     | i |                  |                   | Elmer ICP         |
| armcode | v |                  |                   | instrumentation   |
| 1007C** | e |                  |                   | online this       |
|         | b |                  |                   | summer.**         |
|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | h |                  |                   |                   |
|         | a |                  |                   |                   |
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|         | f |                  |                   |                   |
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|         | n |                  |                   |                   |
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|         | w |                  |                   |                   |
|         | I |                  |                   |                   |
|         | C |                  |                   |                   |
|         | P |                  |                   |                   |
|         | s |                  |                   |                   |
|         | a |                  |                   |                   |
|         | n |                  |                   |                   |
|         | d |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | d |                  |                   |                   |
|         | a |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | c |                  |                   |                   |
|         | o |                  |                   |                   |
|         | m |                  |                   |                   |
|         | p |                  |                   |                   |
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|         | d |                  |                   |                   |
|         | . |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| *P      |   |                  |                   |                   |
| revious |   |                  |                   |                   |
| c       |   |                  |                   |                   |
| omments |   |                  |                   |                   |
| for     |   |                  |                   |                   |
| barium, |   |                  |                   |                   |
| whol    |   |                  |                   |                   |
| e-water |   |                  |                   |                   |
| recov   |   |                  |                   |                   |
| erable, |   |                  |                   |                   |
| ICP,    |   |                  |                   |                   |
| labcode |   |                  |                   |                   |
| 2352,   |   |                  |                   |                   |
| p       |   |                  |                   |                   |
| armcode |   |                  |                   |                   |
| 1007C*  |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | T |                  | Online QC charts  | The NWQL will     |
|         | h |                  | show that the     | reanalyze samples |
| >       | e |                  | negative bias     | on the new ICPs   |
|  QADATA | h |                  | increased         | to compare the    |
| >       | i |                  | significantly     | data, once we     |
| Summary | s |                  | during mid-March. | have assessed the |
| > May   | t |                  | Several           | WWR prove-out     |
| > 2003  | o |                  | troubleshooting   | data for the new  |
|         | r |                  | measures were     | instruments. We   |
|         | i |                  | checked on the    | will continue to  |
|         | c |                  | instrument        | monitor online QC |
|         | a |                  | including: plasma | charts to see if  |
|         | l |                  | power, pump       | the negative bias |
|         | n |                  | efficiency,       | has improved as a |
|         | e |                  | cleaning of       | result of the     |
|         | g |                  | nebulizer and     | optical path      |
|         | a |                  | spray chamber,    | adjustment.       |
|         | t |                  | dark current      |                   |
|         | i |                  | test, all of      |                   |
|         | v |                  | which showed no   |                   |
|         | e |                  | indication of a   |                   |
|         | b |                  | problem. The only |                   |
|         | i |                  | test that showed  |                   |
|         | a |                  | a significant     |                   |
|         | s |                  | problem was that  |                   |
|         | p |                  | the Purged        |                   |
|         | e |                  | Optical Path,     |                   |
|         | r |                  | which needed      |                   |
|         | s |                  | adjusting.        |                   |
|         | i |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | s |                  |                   |                   |
|         | . |                  |                   |                   |
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|         | n |                  |                   |                   |
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|         | w |                  |                   |                   |
|         | I |                  |                   |                   |
|         | C |                  |                   |                   |
|         | P |                  |                   |                   |
|         | s |                  |                   |                   |
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|         | d |                  |                   |                   |
|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | A |                  | New standards     | The NWQL will     |
|         | l |                  | were prepared and | continue to       |
| >       | t |                  | verified by       | monitor. More     |
|  QADATA | h |                  | ICPMS. New        | data from the     |
| >       | o |                  | standards were    | IBSP since these  |
| Summary | u |                  | accepted.         | actions were      |
| > March | g |                  |                   | implemented will  |
| > 2003  | h |                  |                   | be examined in    |
|         | t |                  |                   | order to better   |
|         | h |                  |                   | assess if the     |
|         | e |                  |                   | bias is           |
|         | r |                  |                   | improving.        |
|         | e |                  |                   |                   |
|         | a |                  |                   |                   |
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|         | n |                  |                   |                   |
|         | i |                  |                   |                   |
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|         | o |                  |                   |                   |
|         | r |                  |                   |                   |
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|         | d |                  |                   |                   |
|         | t |                  |                   |                   |
|         | o |                  |                   |                   |
|         | d |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | m |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
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|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
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|         | f |                  |                   |                   |
|         | f |                  |                   |                   |
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|         | s |                  |                   |                   |
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|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | e |                  |                   |                   |
|         | w |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
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|         | s |                  |                   |                   |
|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | T |                  | NWQL charts still | New standards     |
|         | h |                  | show a slight     | will be prepared  |
| >       | e |                  | negative bias.    | and checked the   |
|  QADATA | h |                  | The standards     | first week in     |
| >       | i |                  | approved in       | February, 2003.   |
| Summary | s |                  | August, 2002 were | They will be      |
| >       | t |                  | recently          | compared with the |
| January | o |                  | re-checked and    | old standards on  |
| > 2003  | r |                  | found to be       | the ICP as well   |
|         | i |                  | slightly outside  | as by ICPMS       |
|         | c |                  | acceptance limits | (alternate        |
|         | a |                  | on a new ICP      | method). SRS      |
|         | l |                  | instrument in     | performance will  |
|         | n |                  | development       | be evaluated      |
|         | e |                  | status.           | using the new     |
|         | g |                  |                   | standards. The    |
|         | a |                  |                   | OWQRL lab will be |
|         | t |                  |                   | called to compare |
|         | i |                  |                   | procedures as     |
|         | v |                  |                   | well.             |
|         | e |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | p |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | s |                  |                   |                   |
|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | M |                  | Adjustments to    | Calibration       |
|         | a |                  | past descriptions | standards were    |
| >       | g |                  | of bias from IBSP | made and accepted |
|  QADATA | n |                  | have been to      | on August 20,     |
| >       | i |                  | digest the        | 2002. Standards   |
| Summary | t |                  | calibration       | will be           |
| > Se    | u |                  | standards and QC  | cross-checked by  |
| ptember | d |                  | to match the      | a different       |
| > 2002  | e |                  | digestion process | method. Using lab |
|         | o |                  | of the samples.   | QC data and IBSP, |
|         | f |                  |                   | we will continue  |
|         | h |                  |                   | to monitor and,   |
|         | i |                  |                   | additionally,     |
|         | s |                  |                   | obtain more       |
|         | t |                  |                   | current SRWS from |
|         | o |                  |                   | BQS for internal  |
|         | r |                  |                   | lab QC.           |
|         | i |                  |                   |                   |
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|         | d |                  |                   |                   |
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|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [**C    | * |                  | **NWQL QC charts  | **Instrument has  |
| admium, | * |                  | show variable but | recently been     |
| Whol    | A |                  | acceptable        | optimized, and    |
| e-Water | s |                  | data.**           | the NWQL will     |
| Recover | o |                  |                   | continue to       |
| able**] | f |                  |                   | monitor.**        |
| (http:/ | J |                  |                   |                   |
| /bqs.us | a |                  |                   |                   |
| gs.gov/ | n |                  |                   |                   |
| bsp/QAD | u |                  |                   |                   |
| ATA_all | a |                  |                   |                   |
| /JUL03N | r |                  |                   |                   |
| WQL0102 | y |                  |                   |                   |
| 7F.gif) | 2 |                  |                   |                   |
|         | 0 |                  |                   |                   |
| **GFAA  | 0 |                  |                   |                   |
| labcode | 3 |                  |                   |                   |
| 1555    | , |                  |                   |                   |
| p       | a |                  |                   |                   |
| armcode | h |                  |                   |                   |
| 1027F** | i |                  |                   |                   |
|         | g |                  |                   |                   |
|         | h |                  |                   |                   |
|         | b |                  |                   |                   |
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|         | t |                  |                   |                   |
|         | y |                  |                   |                   |
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|         | n |                  |                   |                   |
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|         | d |                  |                   |                   |
|         | . |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [**C    | * |                  | **Bias may have   | **New standards   |
| admium, | * |                  | been result of    | are being         |
| Filt    | T |                  | old standards**   | prepared and      |
| ered**] | h |                  |                   | compared to       |
| (http:/ | e |                  |                   | purchased NIST    |
| /bqs.us | p |                  |                   | standards. The    |
| gs.gov/ | o |                  |                   | line will be      |
| bsp/QAD | s |                  |                   | monitored for any |
| ATA_all | i |                  |                   | change.**         |
| /JUL03N | t |                  |                   |                   |
| WQL0102 | i |                  |                   |                   |
| 5G.gif) | v |                  |                   |                   |
|         | e |                  |                   |                   |
| *       | b |                  |                   |                   |
| *ICP-MS | i |                  |                   |                   |
| labcode | a |                  |                   |                   |
| 1788    | s |                  |                   |                   |
| p       | , |                  |                   |                   |
| armcode | a |                  |                   |                   |
| 1025G** | l |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
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|         | u |                  |                   |                   |
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|         | A |                  |                   |                   |
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|         | d |                  |                   |                   |
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|         | c |                  |                   |                   |
|         | l |                  |                   |                   |
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|         | s |                  |                   |                   |
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|         | l |                  |                   |                   |
|         | y |                  |                   |                   |
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|         | d |                  |                   |                   |
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|         | x |                  |                   |                   |
|         | t |                  |                   |                   |
|         | Q |                  |                   |                   |
|         | A |                  |                   |                   |
|         | D |                  |                   |                   |
|         | A |                  |                   |                   |
|         | T |                  |                   |                   |
|         | A |                  |                   |                   |
|         | S |                  |                   |                   |
|         | u |                  |                   |                   |
|         | m |                  |                   |                   |
|         | m |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | y |                  |                   |                   |
|         | i |                  |                   |                   |
|         | s |                  |                   |                   |
|         | d |                  |                   |                   |
|         | i |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | r |                  |                   |                   |
|         | i |                  |                   |                   |
|         | b |                  |                   |                   |
|         | u |                  |                   |                   |
|         | t |                  |                   |                   |
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|         | d |                  |                   |                   |
|         | . |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| *P      |   |                  |                   |                   |
| revious |   |                  |                   |                   |
| c       |   |                  |                   |                   |
| omments |   |                  |                   |                   |
| for     |   |                  |                   |                   |
| c       |   |                  |                   |                   |
| admium, |   |                  |                   |                   |
| fi      |   |                  |                   |                   |
| ltered, |   |                  |                   |                   |
| ICP-MS, |   |                  |                   |                   |
| labcode |   |                  |                   |                   |
| 1788,   |   |                  |                   |                   |
| p       |   |                  |                   |                   |
| armcode |   |                  |                   |                   |
| 1025G*  |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | T |                  | Since new         | Different sources |
|         | h |                  | calibration       | of standards will |
| >       | e |                  | standards were    | be obtained and   |
|  QADATA | p |                  | made in January,  | tested in attempt |
| >       | o |                  | third party QC    | to reduce bias.   |
| Summary | s |                  | charts show a     |                   |
| > May   | i |                  | reduction in bias | NWQL will         |
| > 2003  | t |                  | from 5 percent to | continue          |
|         | i |                  | 1 percent at 2    | monitoring with   |
|         | v |                  | ug/L and 3        | older SRWS that   |
|         | e |                  | percent to 1      | have been         |
|         | b |                  | percent at 20     | historically less |
|         | i |                  | ug/L. Blank       | biased for        |
|         | a |                  | control charts    | cadmium along     |
|         | s |                  | show no bias. The | with the newer    |
|         | , |                  | SRWS T-165,       | SRWS where a      |
|         | a |                  | T-167, and T-169  | larger bias is    |
|         | l |                  | control charts    | observed.         |
|         | t |                  | still show larger |                   |
|         | h |                  | relative positive |                   |
|         | o |                  | bias.             |                   |
|         | u |                  |                   |                   |
|         | g |                  | It is possible    |                   |
|         | h |                  | the purchased     |                   |
|         | s |                  | cadmium standards |                   |
|         | h |                  | in current use    |                   |
|         | o |                  | are of lesser     |                   |
|         | w |                  | quality---a       |                   |
|         | i |                  | problem not       |                   |
|         | n |                  | unlike what we    |                   |
|         | g |                  | have recently     |                   |
|         | i |                  | encountered with  |                   |
|         | m |                  | purchased         |                   |
|         | p |                  | standards used    |                   |
|         | r |                  | for antimony.     |                   |
|         | o |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | m |                  |                   |                   |
|         | e |                  |                   |                   |
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|         | s |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | P |                  | Third party QC    | The lab will      |
|         | o |                  | charts show       | continue to       |
| >       | s |                  | improvement since | closely monitor   |
|  QADATA | i |                  | new standards     | third party and   |
| >       | t |                  | started in        | other quality     |
| Summary | i |                  | January 2003.     | assurance         |
| > March | v |                  |                   | samples.          |
| > 2003  | e |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
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|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
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|         | o |                  |                   |                   |
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|         | h |                  |                   |                   |
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|         | . |                  |                   |                   |
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|         | y |                  |                   |                   |
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|         | a |                  |                   |                   |
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|         | W |                  |                   |                   |
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|         | L |                  |                   |                   |
|         | a |                  |                   |                   |
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|         | d |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
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|         | O |                  |                   |                   |
|         | W |                  |                   |                   |
|         | Q |                  |                   |                   |
|         | R |                  |                   |                   |
|         | L |                  |                   |                   |
|         | d |                  |                   |                   |
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|         | h |                  |                   |                   |
|         | o |                  |                   |                   |
|         | w |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | g |                  |                   |                   |
|         | n |                  |                   |                   |
|         | i |                  |                   |                   |
|         | f |                  |                   |                   |
|         | i |                  |                   |                   |
|         | c |                  |                   |                   |
|         | a |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | a |                  |                   |                   |
|         | t |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | i |                  |                   |                   |
|         | s |                  |                   |                   |
|         | l |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
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|         | d |                  |                   |                   |
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|         | s |                  |                   |                   |
|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | T |                  | Third party QC    | New standards are |
|         | h |                  | charts show a 5%  | acceptable and    |
| >       | e |                  | bias at 2 ug/L    | have been in use  |
|  QADATA | s |                  | and 3% bias at 20 | since January     |
| >       | l |                  | ug/L since        | 2003. The NWQL    |
| Summary | i |                  | October 2002. All | will monitor      |
| >       | g |                  | in-house QC data  | cadmium closely   |
| January | h |                  | have been         | for improvement   |
| > 2003  | t |                  | acceptable. New   | in bias.          |
|         | p |                  | SRSs were started |                   |
|         | o |                  | December 2002.    |                   |
|         | s |                  | Not enough data   |                   |
|         | i |                  | for the newest    |                   |
|         | t |                  | SRSs to evaluate  |                   |
|         | i |                  | bias.             |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | a |                  |                   |                   |
|         | t |                  |                   |                   |
|         | d |                  |                   |                   |
|         | e |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | l |                  |                   |                   |
|         | o |                  |                   |                   |
|         | p |                  |                   |                   |
|         | e |                  |                   |                   |
|         | d |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | o |                  |                   |                   |
|         | u |                  |                   |                   |
|         | n |                  |                   |                   |
|         | d |                  |                   |                   |
|         | A |                  |                   |                   |
|         | p |                  |                   |                   |
|         | r |                  |                   |                   |
|         | i |                  |                   |                   |
|         | l |                  |                   |                   |
|         | 2 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 2 |                  |                   |                   |
|         | a |                  |                   |                   |
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|         | p |                  |                   |                   |
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|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | o |                  |                   |                   |
|         | h |                  |                   |                   |
|         | a |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
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|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | e |                  |                   |                   |
|         | d |                  |                   |                   |
|         | e |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | m |                  |                   |                   |
|         | o |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | o |                  |                   |                   |
|         | u |                  |                   |                   |
|         | n |                  |                   |                   |
|         | d |                  |                   |                   |
|         | m |                  |                   |                   |
|         | i |                  |                   |                   |
|         | d |                  |                   |                   |
|         | - |                  |                   |                   |
|         | S |                  |                   |                   |
|         | e |                  |                   |                   |
|         | p |                  |                   |                   |
|         | t |                  |                   |                   |
|         | e |                  |                   |                   |
|         | m |                  |                   |                   |
|         | b |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | 2 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 2 |                  |                   |                   |
|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | A |                  | In-house charts   | Newly purchased   |
|         | s |                  | show bias         | standards are     |
| >       | l |                  | starting at about | prepared and      |
|  QADATA | i |                  | the same time.    | currently         |
| >       | g |                  | All in-house QC   | undergoing        |
| Summary | h |                  | data has been     | verification      |
| > N     | t |                  | acceptable. Bias  | against the       |
| ovember | p |                  | most noticeable   | newest SRS and    |
| > 2002  | o |                  | in the two newest | other third party |
|         | s |                  | mixes.            | standards. The    |
|         | i |                  |                   | lab will monitor  |
|         | t |                  |                   | cadmium closely   |
|         | i |                  |                   | for improvement.  |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | a |                  |                   |                   |
|         | t |                  |                   |                   |
|         | d |                  |                   |                   |
|         | e |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | l |                  |                   |                   |
|         | o |                  |                   |                   |
|         | p |                  |                   |                   |
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|         | d |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | o |                  |                   |                   |
|         | u |                  |                   |                   |
|         | n |                  |                   |                   |
|         | d |                  |                   |                   |
|         | m |                  |                   |                   |
|         | i |                  |                   |                   |
|         | d |                  |                   |                   |
|         | - |                  |                   |                   |
|         | A |                  |                   |                   |
|         | p |                  |                   |                   |
|         | r |                  |                   |                   |
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|         | l |                  |                   |                   |
|         | 2 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 2 |                  |                   |                   |
|         | i |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | c |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | g |                  |                   |                   |
|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [       | * |                  | **Variable, but   | **Instrument has  |
| **Lead, | * |                  | acceptable data   | recently been     |
| Filt    | T |                  | quality is also   | optimized and the |
| ered**] | h |                  | noted on NWQL     | NWQL will monitor |
| (http:/ | e |                  | charts.**         | for               |
| /bqs.us | m |                  |                   | improvement.**    |
| gs.gov/ | o |                  |                   |                   |
| bsp/QAD | s |                  |                   |                   |
| ATA_all | t |                  |                   |                   |
| /JUL03N | r |                  |                   |                   |
| WQL0104 | e |                  |                   |                   |
| 9F.gif) | c |                  |                   |                   |
|         | e |                  |                   |                   |
| **GFAA  | n |                  |                   |                   |
| labcode | t |                  |                   |                   |
| 1560    | l |                  |                   |                   |
| p       | y |                  |                   |                   |
| armcode | r |                  |                   |                   |
| 1049F** | e |                  |                   |                   |
|         | c |                  |                   |                   |
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|         | a |                  |                   |                   |
|         | y |                  |                   |                   |
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|         | n |                  |                   |                   |
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|         | g |                  |                   |                   |
|         | . |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| *P      |   |                  |                   |                   |
| revious |   |                  |                   |                   |
| c       |   |                  |                   |                   |
| omments |   |                  |                   |                   |
| for     |   |                  |                   |                   |
| lead,   |   |                  |                   |                   |
| fi      |   |                  |                   |                   |
| ltered, |   |                  |                   |                   |
| GFAA,   |   |                  |                   |                   |
| labcode |   |                  |                   |                   |
| 1560,   |   |                  |                   |                   |
| p       |   |                  |                   |                   |
| armcode |   |                  |                   |                   |
| 1049F*  |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | V |                  | Change in         | NWQL will         |
|         | a |                  | variability not   | continue to       |
| >       | r |                  | noticeable on     | monitor.          |
|  QADATA | i |                  | NWQL charts.      |                   |
| >       | a |                  |                   |                   |
| Summary | b |                  |                   |                   |
| > May   | i |                  |                   |                   |
| > 2003  | l |                  |                   |                   |
|         | i |                  |                   |                   |
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|         | d |                  |                   |                   |
|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [       |   | The data         | **Variable, but   | **Instrument has  |
| **Lead, |   | indicate         | acceptable data   | recently been     |
| Whole   |   | increased        | quality is also   | optimized and the |
| Water   |   | variability and  | noted on NWQL     | NWQL will monitor |
| Recover |   | positive bias    | charts.**         | for               |
| able**] |   | starting March   |                   | improvement.**    |
| (http:/ |   | 2003.            |                   |                   |
| /bqs.us |   |                  |                   |                   |
| gs.gov/ |   |                  |                   |                   |
| bsp/QAD |   |                  |                   |                   |
| ATA_all |   |                  |                   |                   |
| /JUL03N |   |                  |                   |                   |
| WQL0105 |   |                  |                   |                   |
| 1F.gif) |   |                  |                   |                   |
|         |   |                  |                   |                   |
| **GFAA  |   |                  |                   |                   |
| labcode |   |                  |                   |                   |
| 1561    |   |                  |                   |                   |
| p       |   |                  |                   |                   |
| armcode |   |                  |                   |                   |
| 1051F** |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [**Str  |   | **The            | **The NWQL has    | **QC will be      |
| ontium, |   | variability has  | changed to new    | monitored on the  |
| Filt    |   | increased.**     | ICP               | new               |
| ered**] |   |                  | i                 | instrumentation   |
| (http:/ |   | **Analysis       | nstrumentation.** | until the next    |
| /bqs.us |   | should be        |                   | QADATA Summary is |
| gs.gov/ |   | closely          |                   | distributed.**    |
| bsp/QAD |   | monitored until  |                   |                   |
| ATA_all |   | the next QADATA  |                   |                   |
| /JUL03N |   | Summary is       |                   |                   |
| WQL0108 |   | distributed.**   |                   |                   |
| 0B.gif) |   |                  |                   |                   |
|         |   |                  |                   |                   |
| **ICP   |   |                  |                   |                   |
| labcode |   |                  |                   |                   |
| 0652    |   |                  |                   |                   |
| p       |   |                  |                   |                   |
| armcode |   |                  |                   |                   |
| 1080B** |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+

+---------+---+------------------+-------------------+-------------------+
| **Major | * |                  | **NWQL**          | **Corrective**    |
| De      | * |                  |                   |                   |
| termina | P |                  | **Lab Comment**   | **Action**        |
| tions** | r |                  |                   |                   |
|         | o |                  |                   |                   |
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|         | e |                  |                   |                   |
|         | m |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+=========+===+==================+===================+===================+
| [**C    | * |                  | **The NWQL has    | **QC will be      |
| alcium, | * |                  | changed to new    | monitored on the  |
| Filt    | T |                  | ICP               | new               |
| ered**] | h |                  | i                 | instrumentation   |
| (http:/ | e |                  | nstrumentation.** | until the next    |
| /bqs.us | d |                  |                   | QADATA Summary is |
| gs.gov/ | a |                  |                   | distributed.**    |
| bsp/QAD | t |                  |                   |                   |
| ATA_all | a |                  |                   |                   |
| /JUL03N | s |                  |                   |                   |
| WQL0091 | h |                  |                   |                   |
| 5D.gif) | o |                  |                   |                   |
|         | w |                  |                   |                   |
| **ICP\  | i |                  |                   |                   |
| labcode | n |                  |                   |                   |
| 0659    | c |                  |                   |                   |
| p       | r |                  |                   |                   |
| armcode | e |                  |                   |                   |
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|         | t |                  |                   |                   |
|         | Q |                  |                   |                   |
|         | A |                  |                   |                   |
|         | D |                  |                   |                   |
|         | A |                  |                   |                   |
|         | T |                  |                   |                   |
|         | A |                  |                   |                   |
|         | S |                  |                   |                   |
|         | u |                  |                   |                   |
|         | m |                  |                   |                   |
|         | m |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | y |                  |                   |                   |
|         | i |                  |                   |                   |
|         | s |                  |                   |                   |
|         | d |                  |                   |                   |
|         | i |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | r |                  |                   |                   |
|         | i |                  |                   |                   |
|         | b |                  |                   |                   |
|         | u |                  |                   |                   |
|         | t |                  |                   |                   |
|         | e |                  |                   |                   |
|         | d |                  |                   |                   |
|         | . |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+

###### 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**      | **OWQRL**         | **Corrective**    |
| Metal    |                  |                   |                   |
| Determin |                  | **Lab Comment**   | **Action**        |
| ations** |                  |                   |                   |
+==========+==================+===================+===================+
| [**      | The two new      | **The problems    | **We will         |
| Arsenic, | values received  | with the GFAA at  | continue to       |
| Whole    | since the last   | low wavelengths   | monitor the GFAA  |
| Water    | QADATA Summary   | have been         | closely to be     |
| Recover  | are both within\ | corrected.**      | sure that the     |
| able**]( | one              |                   | problems do not   |
| http://b | f-pseudosigma of |                   | reappear.**       |
| qs.usgs. | the median.      |                   |                   |
| gov/bsp/ |                  |                   |                   |
| QADATA_a | Analysis should  |                   |                   |
| ll/JUL03 | be closely       |                   |                   |
| OWQRL010 | monitored until  |                   |                   |
| 021.gif) | the next QADATA  |                   |                   |
|          | Summary is       |                   |                   |
| **GFAA   | distributed.     |                   |                   |
| labcode  |                  |                   |                   |
| 3119     |                  |                   |                   |
| parmcode |                  |                   |                   |
| 1        |                  |                   |                   |
| 002(1)** |                  |                   |                   |
+----------+------------------+-------------------+-------------------+
| *        |                  |                   |                   |
| Previous |                  |                   |                   |
| comments |                  |                   |                   |
| for      |                  |                   |                   |
| arsenic, |                  |                   |                   |
| who      |                  |                   |                   |
| le-water |                  |                   |                   |
| reco     |                  |                   |                   |
| verable, |                  |                   |                   |
| labcode  |                  |                   |                   |
| 3119,    |                  |                   |                   |
| parmcode |                  |                   |                   |
| 1002(1)* |                  |                   |                   |
+----------+------------------+-------------------+-------------------+
| From     | The variability  | We will be        | More service work |
|          | is beyond        | running a new     | was done to       |
| QADATA   | acceptable       | Demonstration of  | correct problems  |
| Summary  | levels. IBSP     | Capability for    | with the GFAA.    |
| May 2003 | recommends that  | Arsenic before    | Past samples have |
|          | the source of    | any more samples  | been checked by   |
|          | the problem be   | are analyzed.     | other techniques  |
|          | determined       |                   | (ICP, ICP/MS) to  |
|          | before any more  |                   | make sure that    |
|          | analyses of      |                   | values reported   |
|          | environmental    |                   | are correct.      |
|          | samples are      |                   |                   |
|          | performed.       |                   |                   |
|          |                  |                   |                   |
|          | Since October    |                   |                   |
|          | 2002, four out   |                   |                   |
|          | of 13 points     |                   |                   |
|          | (31%) are        |                   |                   |
|          | outside of +/-2  |                   |                   |
|          | SD with 3 of 13  |                   |                   |
|          | (23%) outside of |                   |                   |
|          | +/-3 SD.         |                   |                   |
+----------+------------------+-------------------+-------------------+
| From     | High variability | A problem with    | Service was       |
|          | is still         | the beam combiner | performed on the  |
| QADATA   | exhibited. Since | on the SIMAA      | AA to correct the |
| Summary  | late October     | graphite furnace  | problem. Samples  |
| March    | 2002, three out  | may have led to   | are being rerun   |
| 2003     | of 9 points      | some erratic      | to see if any     |
|          | (33%) are        | results.          | data needs to be  |
|          | outside of +/-2  |                   | corrected.        |
|          | SD.              |                   |                   |
+----------+------------------+-------------------+-------------------+
| From     | Increased        | Problem with      | Amount of matrix  |
|          | variability      | matrix modifier.  | modifier used was |
| QADATA   | starting late    |                   | adjusted to give  |
| Summary  | October 2002.    |                   | more consistent   |
| January  |                  |                   | results.          |
| 2003     |                  |                   |                   |
+----------+------------------+-------------------+-------------------+
|          |                  |                   |                   |
+----------+------------------+-------------------+-------------------+
| [*       | **The historical | **The positive    | **A change in the |
| *Barium, | positive bias    | bias could be     | point at which    |
| Filt     | appears to be    | caused by a       | background        |
| ered**]( | increasing.**    | change in the     | correction is     |
| http://b |                  | background around | applied is being  |
| qs.usgs. |                  | the barium        | tested.**         |
| gov/bsp/ |                  | emission line.**  |                   |
| QADATA_a |                  |                   |                   |
| ll/JUL03 |                  |                   |                   |
| OWQRL010 |                  |                   |                   |
| 054.gif) |                  |                   |                   |
|          |                  |                   |                   |
| **ICP    |                  |                   |                   |
| labcode  |                  |                   |                   |
| 3002     |                  |                   |                   |
| parmcode |                  |                   |                   |
| 1        |                  |                   |                   |
| 005(4)** |                  |                   |                   |
+----------+------------------+-------------------+-------------------+
|          |                  |                   |                   |
+----------+------------------+-------------------+-------------------+