##### QADATA Summary -- April 2005

The Inorganic Blind Sample Project (IBSP) reviews about 110 inorganic
analytical lines at the National Water Quality Laboratory (NWQL) using
double-blind, quality-control samples. A summary of this review, the
QADATA Summary, is a short report commenting on 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 inorganic methods at the NWQL demonstrate acceptable variability
and little or no bias.

The data reviewed in this summary is for the time period 09/01/04
through 04/07/05; 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 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 data
displayed on the IBSP quality-control charts should also affect the
districts' data in a similar manner. Data from samples 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 and then
sent to the NWQL. The NWQL then gets two weeks to respond to the issue
by writing a "Lab Comment" and a "Corrective Action." Comments from the
lab are incorporated into the QADATA Summary as received. The most
recent comments and responses are in bold followed by comments and
responses from previous QADATA Summaries.

Current charts (updated twice weekly) may be accessed at
<http://bqs.usgs.gov/bsp/FY05charts.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.

Historical QADATA Summaries may be accessed at
<http://bqs.usgs.gov/bsp/QAData.htm>.

*Tedmund M. Struzeski*

<struzesk@usgs.gov>

Table of Contents

Report Highlights Page

[One-Page Summary](#Highlights) 3

Detailed Description by Analyte

[Chromium, Filtered,](#nwql0722) ICP, Labcode 0722, Parmcode 1030E 4

[Copper, Whole-Water Recoverable,](#nwql1559) GFAA, Labcode 1559,
Parmcode 1042F 5

[Copper, Whole-Water Recoverable,](#nwql2379) ICP-MS, Labcode 2379,
Parmcode 1042H 5

[Lithium, Filtered,](#nwql0664) ICP, Labcode 0664, Parmcode 1130B 5

[Manganese, Filtered,](#nwql1793) ICP-MS, Labcode 1793, Parmcode 1056G 6

[Manganese, Whole-Water Recoverable,](#nwql2382) ICP-MS, Labcode 2382,
Parmcode 1055C 6

[Strontium, Filtered,](#nwql2507) ICP-MS, Labcode 2507, Parmcode 1080I 7

[Mercury, Whole-Water Recoverable,](#nwql2708) CVAF, Labcode 2708,
Parmcode 71900D 8

[Zinc, Whole-Water Recoverable,](#nwql2390) ICP-MS, Labcode 2390,
Parmcode 1092D 8

[Fluoride, Filtered,](#nwql0031) ISE, Labcode 0031, Parmcode 0950B 8

[Potassium, Filtered,](#nwql2773) ICP, Labcode 2773, Parmcode 0935C 9

[Sulfate, Filtered,](#nwql1572) IC, Labcode 1572, Parmcode 0945G 9

> []{#Highlights .anchor}**Report Highlights**

######### Note: Click the underlined text to access the control chart associated with the comment.

1.  [Chromium](http://bqs.usgs.gov/bsp/QADATA_all/05APR/APR05NWQL01030E.gif)
    by ICP, filtered, parmcode 1030E -- Positive bias starting November
    2004.

2.  [Copper](http://bqs.usgs.gov/bsp/QADATA_all/05APR/APR05NWQL01042F.gif)
    by GFAA, whole-water recoverable, parmcode 1042F -- Long-term
    positive bias starting around May 2004.

3.  [Copper](http://bqs.usgs.gov/bsp/QADATA_all/05APR/APR05NWQL01042H.gif)
    by ICP-MS, whole-water recoverable, parmcode 1042H -- Positive bias
    starting around mid-November 2004.

4.  [Fluoride](http://bqs.usgs.gov/bsp/QADATA_all/05APR/APR05NWQL00950B.gif)
    by ISE, filtered, parmcode 0950B -- Positive bias starting
    mid-November 2004.

5.  [Lithium](http://bqs.usgs.gov/bsp/QADATA_all/05APR/APR05NWQL01130B.gif)
    by ICP, filtered, parmcode 1130B -- Positive bias starting December
    2004.

6.  [Manganese](http://bqs.usgs.gov/bsp/QADATA_all/05APR/APR05NWQL01055C.gif)
    by ICP-MS, whole-water recoverable, parmcode 1055C-- Previous
    negative bias (8%) is now about 12%.

7.  [Zinc](http://bqs.usgs.gov/bsp/QADATA_all/05APR/APR05NWQL01092D.gif)
    by ICP-MS, whole-water recoverable, parmcode 1092D -- Negative bias
    starting December 2004.

NWQL PERFORMANCE ON IBSP SAMPLES

######### **Note: Click the underlined text in the left-hand column to access the control chart for the associated comment.**

+---------+---+------------------+-------------------+-------------------+
| **Trace | * |                  | **NWQL**          | **Corrective**    |
| Metal   | * |                  |                   |                   |
| De      | P |                  | **Comment**       | **Action**        |
| termina | r |                  |                   |                   |
| tions** | o |                  |                   |                   |
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|         | e |                  |                   |                   |
|         | m |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+=========+===+==================+===================+===================+
| []{#n   | * |                  | **Standards were  | **We believe the  |
| wql0722 | * |                  | prepared and      | bias has been     |
| .       | D |                  | verified in       | corrected and     |
| anchor} | a |                  | February. The     | will continue to  |
|         | t |                  | slight bias on    | monitor.**        |
| **[Ch   | a |                  | internal control  |                   |
| romium, | s |                  | charts has        |                   |
| F       | t |                  | decreased         |                   |
| iltered | i |                  | starting about    |                   |
| ](http: | l |                  | March 2005. Upon  |                   |
| //bqs.u | l |                  | request by BQS,   |                   |
| sgs.gov | d |                  | samples analyzed  |                   |
| /bsp/QA | e |                  | before the bias   |                   |
| DATA_al | m |                  | appeared were     |                   |
| l/05APR | o |                  | re-analyzed after |                   |
| /APR05N | n |                  | the new standards |                   |
| WQL0103 | s |                  | were prepared.    |                   |
| 0E.gif) | t |                  | The results       |                   |
| ICP     | r |                  | duplicate within  |                   |
| labcode | a |                  | the precision of  |                   |
| 0722    | t |                  | the method,       |                   |
| p       | e |                  | suggesting the    |                   |
| armcode | a |                  | new standards may |                   |
| 1030E** | p |                  | have corrected    |                   |
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+---------+---+------------------+-------------------+-------------------+
| *P      |   |                  |                   |                   |
| revious |   |                  |                   |                   |
| c       |   |                  |                   |                   |
| omments |   |                  |                   |                   |
| for     |   |                  |                   |                   |
| ch      |   |                  |                   |                   |
| romium, |   |                  |                   |                   |
| fi      |   |                  |                   |                   |
| ltered, |   |                  |                   |                   |
| ICP,    |   |                  |                   |                   |
| labcode |   |                  |                   |                   |
| 0722,   |   |                  |                   |                   |
| p       |   |                  |                   |                   |
| armcode |   |                  |                   |                   |
| 1030E*  |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | D |                  | We have reviewed  | We have no        |
|         | a |                  | internal QC data  | explanation for   |
| >       | t |                  | and we do not     | the bias. We will |
|  QADATA | a |                  | have an           | continue to       |
| >       | e |                  | explanation for   | monitor the       |
| Summary | x |                  | the bias observed | situation and     |
| > F     | h |                  | by BQS. NWQL QC   | attempt to find   |
| ebruary | i |                  | charts show a     | the cause and     |
| > 2005  | b |                  | very slight bias, | review the data   |
|         | i |                  | but within        | with BQS in a     |
|         | t |                  | acceptance        | month.            |
|         | a |                  | criteria.         |                   |
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+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [[]{#n  | * |                  | **The slight bias | **We have no      |
| wql1559 | * |                  | on internal QC    | explanation for   |
| .an     | R |                  | charts described  | the continued     |
| chor}** | e |                  | in the last       | bias and          |
| Copper, | s |                  | summary has       | variability, and  |
| Whol    | u |                  | lessened since    | will continue to  |
| e-Water | l |                  | mid-January 2005. | work with BQS to  |
| Re      | t |                  | The in-bottle     | resolve the bias  |
| coverab | s |                  | digestion spike   | and               |
| le**](h | r |                  | charts show no    | variability.**    |
| ttp://b | e |                  | bias or changes   |                   |
| qs.usgs | c |                  | in variability    |                   |
| .gov/bs | e |                  | from October 2004 |                   |
| p/QADAT | i |                  | to present. The   |                   |
| A_all/0 | v |                  | QC for the runs   |                   |
| 5APR/AP | e |                  | with the outlier  |                   |
| R05NWQL | d |                  | BQS samples was   |                   |
| 01042F. | s |                  | acceptable. There |                   |
| gif)**\ | i |                  | were no carryover |                   |
| GFAA    | n |                  | problems or       |                   |
| labcode | c |                  | sample            |                   |
| 1559    | e |                  | mispours.**       |                   |
| p       | t |                  |                   |                   |
| armcode | h |                  |                   |                   |
| 1042F** | e |                  |                   |                   |
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|         | l |                  |                   |                   |
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|         | s |                  |                   |                   |
|         | ( |                  |                   |                   |
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|         | % |                  |                   |                   |
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|         | / |                  |                   |                   |
|         | - |                  |                   |                   |
|         | 2 |                  |                   |                   |
|         | f |                  |                   |                   |
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|         | p |                  |                   |                   |
|         | s |                  |                   |                   |
|         | e |                  |                   |                   |
|         | u |                  |                   |                   |
|         | d |                  |                   |                   |
|         | o |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | g |                  |                   |                   |
|         | m |                  |                   |                   |
|         | a |                  |                   |                   |
|         | . |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| *P      |   |                  |                   |                   |
| revious |   |                  |                   |                   |
| c       |   |                  |                   |                   |
| omments |   |                  |                   |                   |
| for     |   |                  |                   |                   |
| copper, |   |                  |                   |                   |
| whol    |   |                  |                   |                   |
| e-water |   |                  |                   |                   |
| recov   |   |                  |                   |                   |
| erable, |   |                  |                   |                   |
| GFAA,   |   |                  |                   |                   |
| labcode |   |                  |                   |                   |
| 1559,   |   |                  |                   |                   |
| p       |   |                  |                   |                   |
| armcode |   |                  |                   |                   |
| 1042F*  |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | A |                  | NWQL QC charts    | We will work with |
|         | p |                  | continue to show  | BQS to resolve    |
| >       | o |                  | slight positive   | the bias issue.   |
|  QADATA | s |                  | bias, but within  |                   |
| >       | i |                  | acceptance        |                   |
| Summary | t |                  | criteria since    |                   |
| > F     | i |                  | standards were    |                   |
| ebruary | v |                  | prepared          |                   |
| > 2005  | e |                  | September 27,     |                   |
|         | b |                  | 2004.             |                   |
|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | l |                  |                   |                   |
|         | l |                  |                   |                   |
|         | d |                  |                   |                   |
|         | e |                  |                   |                   |
|         | m |                  |                   |                   |
|         | o |                  |                   |                   |
|         | n |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | r |                  |                   |                   |
|         | a |                  |                   |                   |
|         | t |                  |                   |                   |
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|         | . |                  |                   |                   |
|         | F |                  |                   |                   |
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|         | r |                  |                   |                   |
|         | t |                  |                   |                   |
|         | y |                  |                   |                   |
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|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
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|         | a |                  |                   |                   |
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|         | t |                  |                   |                   |
|         | 4 |                  |                   |                   |
|         | 3 |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | u |                  |                   |                   |
|         | l |                  |                   |                   |
|         | t |                  |                   |                   |
|         | s |                  |                   |                   |
|         | ( |                  |                   |                   |
|         | o |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | l |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | 1 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | m |                  |                   |                   |
|         | o |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | s |                  |                   |                   |
|         | ) |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | h |                  |                   |                   |
|         | i |                  |                   |                   |
|         | g |                  |                   |                   |
|         | h |                  |                   |                   |
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|         | r |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | a |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | v |                  |                   |                   |
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|         | l |                  |                   |                   |
|         | u |                  |                   |                   |
|         | e |                  |                   |                   |
|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | D |                  | NWQL QC charts    | NWQL will         |
|         | a |                  | from May to       | continue to       |
| >       | t |                  | September show a  | closely monitor   |
|  QADATA | a |                  | positive bias of  | analysis for a    |
| >       | s |                  | about 5%. New     | bias.             |
| Summary | h |                  | standards were    |                   |
| > N     | o |                  | prepared and      |                   |
| ovember | w |                  | verified on       |                   |
| > 2004  | a |                  | September 27th,   |                   |
|         | p |                  | 2004. The current |                   |
|         | o |                  | bias is \<1%.     |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | v |                  |                   |                   |
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|         | 2 |                  |                   |                   |
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|         | 8 |                  |                   |                   |
|         | % |                  |                   |                   |
|         | ) |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | r |                  |                   |                   |
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|         | h |                  |                   |                   |
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|         | t |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
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|         | l |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | x |                  |                   |                   |
|         | m |                  |                   |                   |
|         | o |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | s |                  |                   |                   |
|         | . |                  |                   |                   |
|         | A |                  |                   |                   |
|         | l |                  |                   |                   |
|         | l |                  |                   |                   |
|         | r |                  |                   |                   |
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|         | s |                  |                   |                   |
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|         | l |                  |                   |                   |
|         | t |                  |                   |                   |
|         | s |                  |                   |                   |
|         | ( |                  |                   |                   |
|         | 2 |                  |                   |                   |
|         | 5 |                  |                   |                   |
|         | v |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
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|         | a |                  |                   |                   |
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|         | a |                  |                   |                   |
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|         | r |                  |                   |                   |
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|         | h |                  |                   |                   |
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|         | n |                  |                   |                   |
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|         | P |                  |                   |                   |
|         | V |                  |                   |                   |
|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [[]{#n  | * |                  | **As discussed at | **We have no      |
| wql2379 | * |                  | a meeting with    | explanation for   |
| .an     | R |                  | BQS, the internal | the continued     |
| chor}** | e |                  | charts have shown | bias and suggest  |
| Copper, | s |                  | no bias and no    | further work with |
| Whol    | u |                  | changes in        | BQS to ascertain  |
| e-Water | l |                  | variability in    | the cause of      |
| Re      | t |                  | performance going | bias.**           |
| coverab | s |                  | back to October   |                   |
| le**](h | r |                  | 2003.**           |                   |
| ttp://b | e |                  |                   |                   |
| qs.usgs | c |                  | []{.mark}         |                   |
| .gov/bs | e |                  |                   |                   |
| p/QADAT | i |                  |                   |                   |
| A_all/0 | v |                  |                   |                   |
| 5APR/AP | e |                  |                   |                   |
| R05NWQL | d |                  |                   |                   |
| 01042H. | s |                  |                   |                   |
| gif)**\ | i |                  |                   |                   |
| ICP-MS  | n |                  |                   |                   |
| labcode | c |                  |                   |                   |
| 2379    | e |                  |                   |                   |
| p       | t |                  |                   |                   |
| armcode | h |                  |                   |                   |
| 1042H** | e |                  |                   |                   |
|         | l |                  |                   |                   |
|         | a |                  |                   |                   |
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|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| *P      |   |                  |                   |                   |
| revious |   |                  |                   |                   |
| c       |   |                  |                   |                   |
| omments |   |                  |                   |                   |
| for     |   |                  |                   |                   |
| copper, |   |                  |                   |                   |
| whol    |   |                  |                   |                   |
| e-water |   |                  |                   |                   |
| recov   |   |                  |                   |                   |
| erable, |   |                  |                   |                   |
| ICP-MS, |   |                  |                   |                   |
| labcode |   |                  |                   |                   |
| 2379,   |   |                  |                   |                   |
| p       |   |                  |                   |                   |
| armcode |   |                  |                   |                   |
| 1042H*  |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | D |                  | The NWQL QC       | The NWQL will     |
|         | a |                  | charts do not     | review and        |
| >       | t |                  | show an upward    | compare internal  |
|  QADATA | a |                  | trend.            | QC information    |
| >       | e |                  |                   | with BQS in one   |
| Summary | x |                  |                   | month. The NWQL   |
| > F     | h |                  |                   | will work with    |
| ebruary | i |                  |                   | BQS if the trend  |
| > 2005  | b |                  |                   | continues.        |
|         | i |                  |                   | []{.mark}         |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | n |                  |                   |                   |
|         | u |                  |                   |                   |
|         | p |                  |                   |                   |
|         | w |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | d |                  |                   |                   |
|         | t |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | d |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | g |                  |                   |                   |
|         | m |                  |                   |                   |
|         | i |                  |                   |                   |
|         | d |                  |                   |                   |
|         | - |                  |                   |                   |
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+---------+---+------------------+-------------------+-------------------+
| []      |   |                  |                   |                   |
| {.mark} |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [[]{#n  | * |                  | **Upon request by | **We will         |
| wql0664 | * |                  | BQS, samples      | continue to       |
| .anc    | R |                  | analyzed before   | monitor and       |
| hor}**L | e |                  | November 2004     | review with BQS   |
| ithium, | s |                  | were re-analyzed  | in one month.**   |
| Fil     | u |                  | in April. The     |                   |
| tered** | l |                  | results duplicate |                   |
| ](http: | t |                  | within the        |                   |
| //bqs.u | s |                  | precision of the  |                   |
| sgs.gov | a |                  | method.**         |                   |
| /bsp/QA | s |                  |                   |                   |
| DATA_al | o |                  |                   |                   |
| l/05APR | f |                  |                   |                   |
| /APR05N | D |                  |                   |                   |
| WQL0113 | e |                  |                   |                   |
| 0B.gif) | c |                  |                   |                   |
| **ICP   | e |                  |                   |                   |
| labcode | m |                  |                   |                   |
| 0664    | b |                  |                   |                   |
| p       | e |                  |                   |                   |
| armcode | r |                  |                   |                   |
| 1130B** | 2 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 0 |                  |                   |                   |
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|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [[]{#n  | * |                  | **The calibration | **We believe the  |
| wql1793 | * |                  | standards         | bias has been     |
| .ancho  | T |                  | prepared in March | corrected and     |
| r}**Man | h |                  | 2005 from single  | will continue to  |
| ganese, | e |                  | elements have     | monitor.**        |
| Fil     | p |                  | replaced the      |                   |
| tered** | r |                  | multi-element     |                   |
| ](http: | e |                  | standards used    |                   |
| //bqs.u | v |                  | previously. This  |                   |
| sgs.gov | i |                  | appears to have   |                   |
| /bsp/QA | o |                  | improved the      |                   |
| DATA_al | u |                  | bias.**           |                   |
| l/05APR | s |                  |                   |                   |
| /APR05N | l |                  |                   |                   |
| WQL0105 | y |                  |                   |                   |
| 6G.gif) | n |                  |                   |                   |
| *       | o |                  |                   |                   |
| *ICP-MS | t |                  |                   |                   |
| labcode | e |                  |                   |                   |
| 1793    | d |                  |                   |                   |
| p       | b |                  |                   |                   |
| armcode | i |                  |                   |                   |
| 1056G** | a |                  |                   |                   |
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+---------+---+------------------+-------------------+-------------------+
| *P      |   |                  |                   |                   |
| revious |   |                  |                   |                   |
| c       |   |                  |                   |                   |
| omments |   |                  |                   |                   |
| for     |   |                  |                   |                   |
| man     |   |                  |                   |                   |
| ganese, |   |                  |                   |                   |
| fi      |   |                  |                   |                   |
| ltered, |   |                  |                   |                   |
| ICP-MS, |   |                  |                   |                   |
| labcode |   |                  |                   |                   |
| 1793,   |   |                  |                   |                   |
| p       |   |                  |                   |                   |
| armcode |   |                  |                   |                   |
| 1056G*  |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | D |                  | The standards     | The NWQL will     |
|         | a |                  | made on November  | work with BQS and |
| >       | t |                  | 15^th^, 2004 were | Methods Research  |
|  QADATA | a |                  | verified and are  | and Development   |
| >       | s |                  | within acceptable | to determine the  |
| Summary | t |                  | limits. Internal  | cause of the bias |
| > F     | i |                  | QC charts are     | observed on the   |
| ebruary | l |                  | within acceptable | BQS and NWQL      |
| > 2005  | l |                  | limits but have   | charts. []{.mark} |
|         | d |                  | slightly low bias |                   |
|         | e |                  | for the 25 ug/L   |                   |
|         | m |                  | QC standard and   |                   |
|         | o |                  | slightly high     |                   |
|         | n |                  | bias for the 250  |                   |
|         | s |                  | ug/L QC standard. |                   |
|         | t |                  | []{.mark}         |                   |
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|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | D |                  | NWQL QC charts    | New working       |
|         | a |                  | indicate a        | standards will be |
| >       | t |                  | negative bias of  | made the week of  |
|  QADATA | a |                  | about 3.5% since  | November 15, 2004 |
| >       | s |                  | new standards     | and as long as    |
| Summary | i |                  | were prepared and | the bias is less  |
| > N     | n |                  | verified on       | than \<2%, they   |
| ovember | c |                  | September 17^th^, | will be put into  |
| > 2004  | e |                  | 2004. The working | use, otherwise    |
|         | l |                  | standards are     | they will be      |
|         | a |                  | made every two    | remade again.     |
|         | t |                  | months. The stock | NWQL will         |
|         | e |                  | does not appear   | continue to       |
|         | - |                  | to have a bias.   | closely monitor   |
|         | A |                  |                   | analysis for a    |
|         | u |                  |                   | bias.             |
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+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [[]{#n  | * |                  | **The bias still  | **We will prepare |
| wql2382 | * |                  | exists, although  | and verify new    |
| .ancho  | A |                  | not as large as   | calibration       |
| r}**Man | l |                  | observed on the   | standards by May  |
| ganese, | l |                  | BQS charts. New   | 6, 2005 and will  |
| Whol    | r |                  | single element    | continue to       |
| e-Water | e |                  | calibration       | monitor.**        |
| Recove  | s |                  | standards will be |                   |
| rable** | u |                  | prepared. If the  |                   |
| ](http: | l |                  | new standards are |                   |
| //bqs.u | t |                  | acceptable, we    |                   |
| sgs.gov | s |                  | believe the bias  |                   |
| /bsp/QA | s |                  | will improve as   |                   |
| DATA_al | i |                  | it has for the    |                   |
| l/05APR | n |                  | manganese,        |                   |
| /APR05N | c |                  | filtered charts.  |                   |
| WQL0105 | e |                  | Discussions with  |                   |
| 5C.gif) | M |                  | Methods Research  |                   |
| *       | a |                  | and Development   |                   |
| *ICP-MS | r |                  | did not result in |                   |
| labcode | c |                  | any additional    |                   |
| 2382    | h |                  | suggestions for   |                   |
| p       | 2 |                  | corrective        |                   |
| armcode | 0 |                  | action.**         |                   |
| 1055C** | 0 |                  |                   |                   |
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|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| *P      |   |                  |                   |                   |
| revious |   |                  |                   |                   |
| c       |   |                  |                   |                   |
| omments |   |                  |                   |                   |
| for     |   |                  |                   |                   |
| man     |   |                  |                   |                   |
| ganese, |   |                  |                   |                   |
| whol    |   |                  |                   |                   |
| e-water |   |                  |                   |                   |
| recov   |   |                  |                   |                   |
| erable, |   |                  |                   |                   |
| ICP-MS, |   |                  |                   |                   |
| labcode |   |                  |                   |                   |
| 2382,   |   |                  |                   |                   |
| p       |   |                  |                   |                   |
| armcode |   |                  |                   |                   |
| 1055C*  |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | D |                  | The internal QC   | The NWQL will     |
|         | a |                  | chart confirms    | work with BQS and |
| >       | t |                  | the bias in the   | Methods Research  |
|  QADATA | a |                  | BQS chart.        | and Development   |
| >       | i |                  | []{.mark}         | to determine the  |
| Summary | n |                  |                   | cause of the bias |
| > F     | d |                  |                   | observed on the   |
| ebruary | i |                  |                   | BQS and NWQL      |
| > 2005  | c |                  |                   | charts.           |
|         | a |                  |                   |                   |
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|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| []      |   |                  |                   |                   |
| {.mark} |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [[]{#n  | * |                  | **The variability | **We will         |
| wql2507 | * |                  | has improved      | continue to       |
| .ancho  | R |                  | since the last QA | monitor and       |
| r}**Str | e |                  | data summary.**   | review in one     |
| ontium, | s |                  |                   | month with BQS.** |
| Fil     | u |                  |                   |                   |
| tered** | l |                  |                   |                   |
| ](http: | t |                  |                   |                   |
| //bqs.u | s |                  |                   |                   |
| sgs.gov | r |                  |                   |                   |
| /bsp/QA | e |                  |                   |                   |
| DATA_al | c |                  |                   |                   |
| l/05APR | e |                  |                   |                   |
| /APR05N | i |                  |                   |                   |
| WQL0108 | v |                  |                   |                   |
| 0I.gif) | e |                  |                   |                   |
| *       | d |                  |                   |                   |
| *ICP-MS | s |                  |                   |                   |
| labcode | i |                  |                   |                   |
| 2507    | n |                  |                   |                   |
| p       | c |                  |                   |                   |
| armcode | e |                  |                   |                   |
| 1080I** | t |                  |                   |                   |
|         | h |                  |                   |                   |
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|         | A |                  |                   |                   |
|         | D |                  |                   |                   |
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|         | d |                  |                   |                   |
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|         | t |                  |                   |                   |
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|         | d |                  |                   |                   |
|         | . |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| *P      |   |                  |                   |                   |
| revious |   |                  |                   |                   |
| c       |   |                  |                   |                   |
| omments |   |                  |                   |                   |
| for     |   |                  |                   |                   |
| str     |   |                  |                   |                   |
| ontium, |   |                  |                   |                   |
| fi      |   |                  |                   |                   |
| ltered, |   |                  |                   |                   |
| ICP-MS, |   |                  |                   |                   |
| labcode |   |                  |                   |                   |
| 2507,   |   |                  |                   |                   |
| p       |   |                  |                   |                   |
| armcode |   |                  |                   |                   |
| 1080I*  |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | T |                  | The NWQL QC       | We have no        |
|         | h |                  | charts continue   | explanation for   |
| >       | e |                  | to show the same  | the high          |
|  QADATA | v |                  | bias (about 3.2%) | variability       |
| >       | a |                  | observed in the   | observed in the   |
| Summary | r |                  | November QA Data  | BQS charts. We    |
| > F     | i |                  | summary. The QC   | will continue to  |
| ebruary | a |                  | for the runs with | monitor for       |
| > 2005  | b |                  | the outlier BQS   | variability and   |
|         | i |                  | samples was       | review with BQS   |
|         | l |                  | acceptable. There | in one month.     |
|         | i |                  | were no carryover |                   |
|         | t |                  | problems or       |                   |
|         | y |                  | sample mispours.  |                   |
|         | h |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
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|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | R |                  | NWQL QC charts    | New standards     |
|         | e |                  | indicate a        | will be purchased |
| >       | s |                  | positive bias of  | this month and    |
|  QADATA | u |                  | about 3.2%. Using | verified by a     |
| >       | l |                  | a NIST standard   | NIST third party  |
| Summary | t |                  | as a check, the   | check standard.   |
| > N     | s |                  | calibration       | In the interim,   |
| ovember | s |                  | standards are     | we will be using  |
| > 2004  | t |                  | also showing a    | an individual     |
|         | i |                  | positive bias.    | strontium         |
|         | l |                  | The section is    | standard to make  |
|         | l |                  | looking into the  | an interim        |
|         | s |                  | possibility that  | calibration       |
|         | h |                  | the concentration | standard.         |
|         | o |                  | for strontium is  |                   |
|         | w |                  | not correctly     | NWQL will         |
|         | h |                  | calculated in the | continue to       |
|         | i |                  | custom mix that   | closely monitor   |
|         | g |                  | is purchased from | analysis for bias |
|         | h |                  | an outside        | and variability.  |
|         | v |                  | vendor.           |                   |
|         | a |                  |                   |                   |
|         | r |                  | NWQL QC charts    |                   |
|         | i |                  | indicate a        |                   |
|         | a |                  | decrease in       |                   |
|         | b |                  | variability       |                   |
|         | i |                  | beginning in late |                   |
|         | l |                  | September, 2004.  |                   |
|         | i |                  |                   |                   |
|         | t |                  | We do not appear  |                   |
|         | y |                  | to have high      |                   |
|         | . |                  | variability at    |                   |
|         | S |                  | this time.        |                   |
|         | i |                  |                   |                   |
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|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | R |                  | A software        | The instrument    |
|         | e |                  | problem was       | vendor has fixed  |
| >       | s |                  | detected in       | the software      |
|  QADATA | u |                  | mid-August that   | problem and a new |
| >       | l |                  | caused a slight   | detector has been |
| Summary | t |                  | increase in       | installed.        |
| > Se    | s |                  | variability for   | Calibration       |
| ptember | r |                  | strontium. Also,  | standards will be |
| > 2004  | e |                  | at this same      | remade and        |
|         | c |                  | time, it was      | verified by       |
|         | e |                  | determined that   | September 14th.   |
|         | i |                  | the instrument    | NWQL will         |
|         | v |                  | detector needed   | continue to       |
|         | e |                  | replacement.      | monitor strontium |
|         | d |                  |                   | for bias and      |
|         | a |                  | NWQL QC charts    | variability.      |
|         | s |                  | indicate a        | []{.mark}         |
|         | o |                  | negative bias of  |                   |
|         | f |                  | 5%.               |                   |
|         | m |                  |                   |                   |
|         | i |                  |                   |                   |
|         | d |                  |                   |                   |
|         | - |                  |                   |                   |
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|         | 4 |                  |                   |                   |
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|         | 3 |                  |                   |                   |
|         | % |                  |                   |                   |
|         | ) |                  |                   |                   |
|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| []      |   |                  |                   |                   |
| {.mark} |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| []{#n   | * |                  | **The internal    | **We will         |
| wql2708 | * |                  | charts confirm a  | continue to       |
| .       | D |                  | bias that stopped | monitor and       |
| anchor} | a |                  | around the        | review with BQS   |
|         | t |                  | beginning of      | in one month.**   |
| [**M    | a |                  | April 2005.**     |                   |
| ercury, | f |                  |                   |                   |
| Whol    | o |                  |                   |                   |
| e-Water | r |                  |                   |                   |
| Recove  | M |                  |                   |                   |
| rable** | a |                  |                   |                   |
| ](http: | r |                  |                   |                   |
| //bqs.u | c |                  |                   |                   |
| sgs.gov | h |                  |                   |                   |
| /bsp/QA | 2 |                  |                   |                   |
| DATA_al | 0 |                  |                   |                   |
| l/05APR | 0 |                  |                   |                   |
| /APR05N | 5 |                  |                   |                   |
| WQL7190 | a |                  |                   |                   |
| 0D.gif) | r |                  |                   |                   |
| **CVAF  | e |                  |                   |                   |
| labcode | b |                  |                   |                   |
| 2708    | i |                  |                   |                   |
| p       | a |                  |                   |                   |
| armcode | s |                  |                   |                   |
| 7       | e |                  |                   |                   |
| 1900D** | d |                  |                   |                   |
|         | 1 |                  |                   |                   |
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|         | u |                  |                   |                   |
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|         | d |                  |                   |                   |
|         | . |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| []{#n   | * |                  | **One internal    | **We have no      |
| wql2390 | * |                  | chart shows a -4% | explanation for   |
| .       | D |                  | bias for December | the low bias      |
| anchor} | a |                  | 2004 only and no  | observed in the   |
|         | t |                  | bias is observed  | BQS charts. We    |
| [       | a |                  | on all charts for | will continue to  |
| **Zinc, | s |                  | the remaining     | monitor for the   |
| Whol    | i |                  | time period.**    | low bias and      |
| e-Water | n |                  |                   | review with BQS   |
| Recove  | c |                  |                   | in one month.**   |
| rable** | e |                  |                   |                   |
| ](http: | D |                  |                   |                   |
| //bqs.u | e |                  |                   |                   |
| sgs.gov | c |                  |                   |                   |
| /bsp/QA | e |                  |                   |                   |
| DATA_al | m |                  |                   |                   |
| l/05APR | b |                  |                   |                   |
| /APR05N | e |                  |                   |                   |
| WQL0109 | r |                  |                   |                   |
| 2D.gif) | 2 |                  |                   |                   |
| *       | 0 |                  |                   |                   |
| *ICP-MS | 0 |                  |                   |                   |
| labcode | 4 |                  |                   |                   |
| 2390    | a |                  |                   |                   |
| p       | r |                  |                   |                   |
| armcode | e |                  |                   |                   |
| 1092D** | b |                  |                   |                   |
|         | i |                  |                   |                   |
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|         | * |                  |                   |                   |
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|         |   |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
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|         | v |                  |                   |                   |
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|         | d |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | f |                  |                   |                   |
|         | o |                  |                   |                   |
|         | r |                  |                   |                   |
|         | f |                  |                   |                   |
|         | i |                  |                   |                   |
|         | l |                  |                   |                   |
|         | t |                  |                   |                   |
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|         | r |                  |                   |                   |
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|         | d |                  |                   |                   |
|         | z |                  |                   |                   |
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|         | n |                  |                   |                   |
|         | c |                  |                   |                   |
|         | b |                  |                   |                   |
|         | y |                  |                   |                   |
|         | I |                  |                   |                   |
|         | C |                  |                   |                   |
|         | P |                  |                   |                   |
|         | ‑ |                  |                   |                   |
|         | M |                  |                   |                   |
|         | S |                  |                   |                   |
|         | . |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+

+---------+---+------------------+-------------------+-------------------+
| **Major | * |                  | **NWQL**          | **Corrective**    |
| De      | * |                  |                   |                   |
| termina | P |                  | **Comment**       | **Action**        |
| tions** | r |                  |                   |                   |
|         | o |                  |                   |                   |
|         | b |                  |                   |                   |
|         | l |                  |                   |                   |
|         | e |                  |                   |                   |
|         | m |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+=========+===+==================+===================+===================+
| []{#n   | * |                  | **The NWQL agrees | **We are ordering |
| wql0031 | * |                  | with the          | new stock         |
| .       | D |                  | observation.**    | standards and     |
| anchor} | a |                  |                   | will prepare and  |
|         | t |                  |                   | verify new        |
| **[Fl   | a |                  |                   | working standards |
| uoride, | s |                  |                   | by April 29,      |
| Fi      | i |                  |                   | 2005. We also     |
| ltered] | n |                  |                   | ordered a new     |
| (http:/ | c |                  |                   | electrode to see  |
| /bqs.us | e |                  |                   | if the current    |
| gs.gov/ | m |                  |                   | electrode is      |
| bsp/QAD | i |                  |                   | contributing to   |
| ATA_all | d |                  |                   | the bias.**       |
| /05APR/ | - |                  |                   |                   |
| APR05NW | N |                  |                   |                   |
| QL00950 | o |                  |                   |                   |
| B.gif)\ | v |                  |                   |                   |
| ISE     | e |                  |                   |                   |
| labcode | m |                  |                   |                   |
| 0031    | b |                  |                   |                   |
| p       | e |                  |                   |                   |
| armcode | r |                  |                   |                   |
| 0950B** | 2 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 4 |                  |                   |                   |
|         | a |                  |                   |                   |
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|         | h |                  |                   |                   |
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|         | g |                  |                   |                   |
|         | h |                  |                   |                   |
|         | b |                  |                   |                   |
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|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [[]{#n  | * |                  | **The standards   | **We will         |
| wql2773 | * |                  | prepared in       | continue to       |
| .ancho  | T |                  | February appear   | monitor for bias  |
| r}**Pot | h |                  | to have corrected | and review the    |
| assium, | e |                  | the bias observed | data with BQS in  |
| Fil     | p |                  | in the BQS        | a month.**        |
| tered** | r |                  | chart.**          |                   |
| ](http: | e |                  |                   |                   |
| //bqs.u | v |                  |                   |                   |
| sgs.gov | i |                  |                   |                   |
| /bsp/QA | o |                  |                   |                   |
| DATA_al | u |                  |                   |                   |
| l/05APR | s |                  |                   |                   |
| /APR05N | l |                  |                   |                   |
| WQL0093 | y |                  |                   |                   |
| 5C.gif) | n |                  |                   |                   |
| **\     | o |                  |                   |                   |
| ICP     | t |                  |                   |                   |
| labcode | e |                  |                   |                   |
| 2773    | d |                  |                   |                   |
| p       | b |                  |                   |                   |
| armcode | i |                  |                   |                   |
| 0935C** | a |                  |                   |                   |
|         | s |                  |                   |                   |
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|         | o |                  |                   |                   |
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|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| *P      |   |                  |                   |                   |
| revious |   |                  |                   |                   |
| c       |   |                  |                   |                   |
| omments |   |                  |                   |                   |
| for     |   |                  |                   |                   |
| pot     |   |                  |                   |                   |
| assium, |   |                  |                   |                   |
| fi      |   |                  |                   |                   |
| ltered, |   |                  |                   |                   |
| ICP,    |   |                  |                   |                   |
| labcode |   |                  |                   |                   |
| 2773,   |   |                  |                   |                   |
| p       |   |                  |                   |                   |
| armcode |   |                  |                   |                   |
| 0935C*  |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | A |                  | The NWQL QC       | New standards     |
|         | p |                  | charts show less  | will be prepared  |
| >       | o |                  | bias since        | and verification  |
|  QADATA | s |                  | January 2005. The | initiated by Feb. |
| >       | i |                  | charts also show  | 14, 2005.         |
| Summary | t |                  | a decrease in     |                   |
| > F     | i |                  | variability since | We will continue  |
| ebruary | v |                  | October 2004.     | to monitor for    |
| > 2005  | e |                  | []{.mark}         | bias after the    |
|         | b |                  |                   | new standards are |
|         | i |                  |                   | prepared and      |
|         | a |                  |                   | review the data   |
|         | s |                  |                   | with BQS in a     |
|         | i |                  |                   | month.            |
|         | s |                  |                   |                   |
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+---------+---+------------------+-------------------+-------------------+
| []      |   |                  |                   |                   |
| {.mark} |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [[]{#n  | * |                  |                   |                   |
| wql1572 | * |                  |                   |                   |
| .anc    | T |                  |                   |                   |
| hor}**S | h |                  |                   |                   |
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+---------+---+------------------+-------------------+-------------------+
| *P      |   |                  |                   |                   |
| revious |   |                  |                   |                   |
| c       |   |                  |                   |                   |
| omments |   |                  |                   |                   |
| for     |   |                  |                   |                   |
| s       |   |                  |                   |                   |
| ulfate, |   |                  |                   |                   |
| fi      |   |                  |                   |                   |
| ltered, |   |                  |                   |                   |
| IC,     |   |                  |                   |                   |
| labcode |   |                  |                   |                   |
| 1572,   |   |                  |                   |                   |
| p       |   |                  |                   |                   |
| armcode |   |                  |                   |                   |
| 0945G*  |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | T |                  | We are aware of   | We are currently  |
|         | h |                  | the slight        | trouble shooting  |
| >       | e |                  | negative bias.    | all aspects of    |
|  QADATA | d |                  | Bench QC has      | the analytical    |
| >       | a |                  | shown negative    | method in an      |
| Summary | t |                  | bias at           | effort to         |
| > F     | a |                  |                   | identify the      |
| ebruary | s |                  | concentrations    | source of the     |
| > 2005  | h |                  | less than about   | bias. As we make  |
|         | o |                  | 10 mg/L.          | adjustments, we   |
|         | w |                  |                   | will continue to  |
|         | t |                  |                   | monitor for       |
|         | h |                  |                   | improvements in   |
|         | e |                  |                   | the bias.         |
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+---------+---+------------------+-------------------+-------------------+
| From    | D |                  |                   |                   |
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+---------+---+------------------+-------------------+-------------------+
| From    | T |                  | We reviewed       | We have no        |
|         | h |                  | internal QC to    | explanation of    |
| >       | e |                  | help evaluate the | the bias, or why  |
|  QADATA | c |                  | observed bias.    | it is only        |
| >       | h |                  | Our data          | evident in the    |
| Summary | a |                  | indicates a bias  | middle of the     |
| > Se    | r |                  | of about 3% or    | analytical range. |
| ptember | t |                  | less, in only the | We will continue  |
| > 2004  | i |                  | midsection of the | to monitor the    |
|         | n |                  | analytical range. | situation and     |
|         | d |                  | We also noticed   | attempt to find   |
|         | i |                  | increased         | the cause.        |
|         | c |                  | variability       |                   |
|         | a |                  | during the period |                   |
|         | t |                  | of the observed   |                   |
|         | e |                  | bias. We are      |                   |
|         | s |                  | currently         |                   |
|         | a |                  | implementing new  |                   |
|         | s |                  | instruments on    |                   |
|         | l |                  | this analytical   |                   |
|         | i |                  | line, and will    |                   |
|         | g |                  | eliminate use of  |                   |
|         | h |                  | the instrument    |                   |
|         | t |                  | producing the     |                   |
|         | n |                  | observed bias in  |                   |
|         | e |                  | the next few      |                   |
|         | g |                  | months.           |                   |
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+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+

######