##### QADATA Summary -- February 2005

The Inorganic Blind Sample Project (IBSP) of the Branch of Quality
Systems (BQS) 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 07/01/04
through 01/27/05; 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' environmental 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 from
previous QADATA Summaries. About one month after this report is
distributed, the IBSP and the NWQL will meet to follow-up on corrective
actions and to discuss new data generated since this report.

Current charts (updated twice weekly) may be accessed at
[http://bqs.usgs.gov/bsp/FY04_05charts.htm](http://bqs.usgs.gov/bsp/FY04charts.htm).
Laboratory and district personnel can also make their own QADATA
retrieval to parallel their project's sampling period by using the
QADATA Application online at
[http://bqs.usgs.gov/bsp](http://bqs.usgs.gov/bsp/mainpage.html) (select
QADATA Application button). Charts pertaining specifically to this
report can be accessed electronically by following the underlined
hyperlinks embedded within the report and associated with each analysis
discussed.

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

[Orthophosphorus, Filtered,](#nwql1974) Colorimetric, Labcode 1974,
Parmcode 0671H 4

[Chromium, Filtered,](#nwql1936) GFAA, Labcode 1936, Parmcode 1030I 4

[Chromium, Filtered,](#nwql0722) ICP, Labcode 0722, Parmcode 1030E 5

[Copper, Filtered,](#nwql1558) GFAA, Labcode 1558, Parmcode 1040F 5

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

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

[Chloride, Filtered,](#nwql1571) IC, Labcode 1571, Parmcode 0940J 8

[Magnesium, Filtered,](#nwql0663) ICP, Labcode 0663, Parmcode 0925C 8

[Potassium, Filtered,](#nwql2773) ICP, Labcode 2773, Parmcode 0935C 8

[Silica, Filtered,](#nwql0667) ICP, Labcode 0667, Parmcode 0955D 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/05JAN/JAN05NWQL01030E.gif)
    by ICP, filtered, lc 0722 -- Positive bias starting November 2004.

2.  Copper by GFAA,
    [filtered](http://bqs.usgs.gov/bsp/QADATA_all/04NOV/NOV04NWQL01040F.gif)
    and [whole-water
    recoverable](http://bqs.usgs.gov/bsp/QADATA_all/04NOV/NOV04NWQL01042F.gif),
    lcs 1558 and 1559 -- Positive bias starting around May 2004.

3.  Manganese by ICP-MS,
    [filtered](http://bqs.usgs.gov/bsp/QADATA_all/05JAN/JAN05NWQL01056G.gif)
    and [whole-water
    recoverable](http://bqs.usgs.gov/bsp/QADATA_all/05JAN/JAN05NWQL01055C.gif),
    lcs 1793 and 2382 -- Negative bias (about 8%) for about six months.

4.  [Potassium](http://bqs.usgs.gov/bsp/QADATA_all/05JAN/JAN05NWQL00935C.gif)
    by ICP, filtered, lc 2773 -- Slight positive bias (5.7%) starting
    November 2004.

5.  [Strontium](http://bqs.usgs.gov/bsp/QADATA_all/04NOV/NOV04NWQL01080I.gif)
    by ICP-MS, filtered, lc 2507 -- Very high variability.

6.  [Sulfate](http://bqs.usgs.gov/bsp/QADATA_all/05JAN/JAN05NWQL00945G.gif)
    by IC, filtered, lc 1571 -- Negative bias (7.2%) starting November
    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.**

+---------+------------------+-------------------+-------------------+
| **N     | **Problem**      | **NWQL**          | **Corrective**    |
| utrient |                  |                   |                   |
| De      |                  | **Comment**       | **Action**        |
| termina |                  |                   |                   |
| tions** |                  |                   |                   |
+=========+==================+===================+===================+
| [[]{#n  | **A negative     | **An instrument   |                   |
| wql1974 | bias is          | problem that has  |                   |
| .anch   | demonstrated for | been corrected    |                   |
| or}**Or | the latter half  | was the reason    |                   |
| thophos | of November      | for the three low |                   |
| phorus, | 2004. Results    | data points in    |                   |
| Fil     | since then       | late November     |                   |
| tered** | (except one      | 2004.**           |                   |
| ](http: | value) exhibit   |                   |                   |
| //bqs.u | little bias and  |                   |                   |
| sgs.gov | acceptable       |                   |                   |
| /bsp/QA | variability.**   |                   |                   |
| DATA_al |                  |                   |                   |
| l/05JAN | **No corrective  |                   |                   |
| /JAN05N | action           |                   |                   |
| WQL0067 | necessary.**     |                   |                   |
| 1H.gif) |                  |                   |                   |
| **color |                  |                   |                   |
| imetric |                  |                   |                   |
| labcode |                  |                   |                   |
| 1974    |                  |                   |                   |
| p       |                  |                   |                   |
| armcode |                  |                   |                   |
| 0671H** |                  |                   |                   |
+---------+------------------+-------------------+-------------------+

+---------+---+------------------+-------------------+-------------------+
| **Trace | * |                  | **NWQL**          | **Corrective**    |
| Metal   | * |                  |                   |                   |
| De      | P |                  | **Comment**       | **Action**        |
| termina | r |                  |                   |                   |
| tions** | o |                  |                   |                   |
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|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+=========+===+==================+===================+===================+
| [[]{#n  | * |                  | []{.mark}         | []{.mark}         |
| wql1936 | * |                  |                   |                   |
| .anch   | T |                  |                   |                   |
| or}**Ch | h |                  |                   |                   |
| romium, | e |                  |                   |                   |
| Fil     | p |                  |                   |                   |
| tered** | o |                  |                   |                   |
| ](http: | s |                  |                   |                   |
| //bqs.u | i |                  |                   |                   |
| sgs.gov | t |                  |                   |                   |
| /bsp/QA | i |                  |                   |                   |
| DATA_al | v |                  |                   |                   |
| l/05JAN | e |                  |                   |                   |
| /JAN05N | b |                  |                   |                   |
| WQL0103 | i |                  |                   |                   |
| 0I.gif) | a |                  |                   |                   |
| **GFAA  | s |                  |                   |                   |
| labcode | s |                  |                   |                   |
| 1936    | t |                  |                   |                   |
| p       | a |                  |                   |                   |
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+---------+---+------------------+-------------------+-------------------+
| *P      |   |                  |                   |                   |
| revious |   |                  |                   |                   |
| c       |   |                  |                   |                   |
| omments |   |                  |                   |                   |
| for     |   |                  |                   |                   |
| ch      |   |                  |                   |                   |
| romium, |   |                  |                   |                   |
| fi      |   |                  |                   |                   |
| ltered, |   |                  |                   |                   |
| GFAA,   |   |                  |                   |                   |
| labcode |   |                  |                   |                   |
| 1936,   |   |                  |                   |                   |
| p       |   |                  |                   |                   |
| armcode |   |                  |                   |                   |
| 1030I*  |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | A |                  | NWQL QC charts    | NWQL will         |
|         | p |                  | indicate a \<1%   | continue to       |
| >       | o |                  | negative bias.    | closely monitor   |
|  QADATA | s |                  | New standards     | analysis for a    |
| >       | i |                  | were prepared and | bias.             |
| Summary | t |                  | verified on       |                   |
| > N     | i |                  | September 27th,   |                   |
| ovember | v |                  | 2004. A NIST      |                   |
| > 2004  | e |                  | traceable         |                   |
|         | b |                  | standard was run  |                   |
|         | i |                  | on the GFAA. It   |                   |
|         | a |                  | indicates that    |                   |
|         | s |                  | the new standards |                   |
|         | i |                  | are within        |                   |
|         | s |                  | specification.    |                   |
|         | s |                  | Data indicates    |                   |
|         | t |                  | the bias is \<    |                   |
|         | i |                  | 2%. Six of the    |                   |
|         | l |                  | blind samples     |                   |
|         | l |                  | were rerun on     |                   |
|         | e |                  | November 4th, and |                   |
|         | v |                  | a positive bias   |                   |
|         | i |                  | is not evident.   |                   |
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+---------+---+------------------+-------------------+-------------------+
| From    | T |                  | NWQL QC charts do | NWQL will         |
|         | h |                  | not indicate a    | continue to       |
| >       | e |                  | bias.             | closely monitor   |
|  QADATA | c |                  | []{.mark}Eleven   | analysis.         |
| >       | h |                  | of the BQS        |                   |
| Summary | a |                  | samples were run  |                   |
| > Se    | r |                  | on the ICP and    |                   |
| ptember | t |                  | all values were   |                   |
| > 2004  | s |                  | higher than the   |                   |
|         | h |                  | MPV. The QC for   |                   |
|         | o |                  | the run (CCVs and |                   |
|         | w |                  | TPCs) was running |                   |
|         | s |                  | slightly lower    |                   |
|         | a |                  | than the MPV. A   |                   |
|         | p |                  | NIST traceable    |                   |
|         | o |                  | standard was run  |                   |
|         | s |                  | on the GFAA. The  |                   |
|         | i |                  | values came out   |                   |
|         | t |                  | slightly lower    |                   |
|         | i |                  | than the MPV.     |                   |
|         | v |                  | []{.mark}         |                   |
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|         | M |                  |                   |                   |
|         | P |                  |                   |                   |
|         | V |                  |                   |                   |
|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [[]{#n  | * |                  | **We have         | **We have no      |
| wql0722 | * |                  | reviewed internal | explanation for   |
| .anch   | D |                  | QC data and we do | the bias. We will |
| or}**Ch | a |                  | not have an       | continue to       |
| romium, | t |                  | explanation for   | monitor the       |
| Fil     | a |                  | the bias observed | situation and     |
| tered** | e |                  | by BQS. NWQL QC   | attempt to find   |
| ](http: | x |                  | charts show a     | the cause and     |
| //bqs.u | h |                  | very slight bias, | review the data   |
| sgs.gov | i |                  | but within        | with BQS in a     |
| /bsp/QA | b |                  | acceptance        | month.**          |
| DATA_al | i |                  | criteria.**       |                   |
| l/05JAN | t |                  |                   |                   |
| /JAN05N | a |                  |                   |                   |
| WQL0103 | n |                  |                   |                   |
| 0E.gif) | u |                  |                   |                   |
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|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [[]{#n  | * |                  |                   | []{.mark}         |
| wql1558 | * |                  |                   |                   |
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| Filter  | t |                  |                   |                   |
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| qs.usgs | h |                  |                   |                   |
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| p/QADAT | l |                  |                   |                   |
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| 5JAN/JA | w |                  |                   |                   |
| N05NWQL | n |                  |                   |                   |
| 01040F. | u |                  |                   |                   |
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| revious |   |                  |                   |                   |
| c       |   |                  |                   |                   |
| omments |   |                  |                   |                   |
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| fi      |   |                  |                   |                   |
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+---------+---+------------------+-------------------+-------------------+
| From    | A |                  | NWQL QC charts    | NWQL will         |
|         | s |                  | also show an      | continue to       |
| >       | o |                  | increase in       | closely monitor   |
|  QADATA | f |                  | variability       | analysis for bias |
| >       | m |                  | during June and   | and variability.  |
| Summary | i |                  | July, although    |                   |
| > N     | d |                  | all QC data was   |                   |
| ovember | - |                  | within acceptable |                   |
| > 2004  | M |                  | limits.           |                   |
|         | a |                  | Variability has   |                   |
|         | y |                  | improved since    |                   |
|         | 2 |                  | then. A positive  |                   |
|         | 0 |                  | bias is evident   |                   |
|         | 0 |                  | on QC charts of   |                   |
|         | 4 |                  | 2-4% from May to  |                   |
|         | , |                  | September. New    |                   |
|         | t |                  | standards were    |                   |
|         | h |                  | prepared and      |                   |
|         | e |                  | verified on       |                   |
|         | d |                  | September 27th,   |                   |
|         | a |                  | 2004 and the      |                   |
|         | t |                  | current bias is   |                   |
|         | a |                  | \<2%.             |                   |
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+---------+---+------------------+-------------------+-------------------+
| []      |   |                  |                   |                   |
| {.mark} |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [[]{#n  | * |                  | **NWQL QC charts  | **We will work    |
| wql1559 | * |                  | continue to show  | with BQS to       |
| .an     | A |                  | slight positive   | resolve the bias  |
| chor}** | p |                  | bias, but within  | issue.**          |
| Copper, | o |                  | acceptance        |                   |
| Whol    | s |                  | criteria since    |                   |
| e-Water | i |                  | standards were    |                   |
| Re      | t |                  | prepared          |                   |
| coverab | i |                  | September 27,     |                   |
| le**](h | v |                  | 2004.**           |                   |
| ttp://b | e |                  |                   |                   |
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| p/QADAT | a |                  |                   |                   |
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| N05NWQL | s |                  |                   |                   |
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+---------+---+------------------+-------------------+-------------------+
| *P      |   |                  |                   |                   |
| revious |   |                  |                   |                   |
| c       |   |                  |                   |                   |
| omments |   |                  |                   |                   |
| for     |   |                  |                   |                   |
| copper, |   |                  |                   |                   |
| whol    |   |                  |                   |                   |
| e-water |   |                  |                   |                   |
| recov   |   |                  |                   |                   |
| erable, |   |                  |                   |                   |
| GFAA,   |   |                  |                   |                   |
| labcode |   |                  |                   |                   |
| 1559,   |   |                  |                   |                   |
| p       |   |                  |                   |                   |
| armcode |   |                  |                   |                   |
| 1042F*  |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| 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 |                  |                   |                   |
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+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [[]{#n  | * |                  | **The NWQL QC     | **The NWQL will   |
| wql2379 | * |                  | charts do not     | review and        |
| .an     | D |                  | show an upward    | compare internal  |
| chor}** | a |                  | trend.**          | QC information    |
| Copper, | t |                  |                   | with BQS in one   |
| Whol    | a |                  |                   | month. The NWQL   |
| e-Water | e |                  |                   | will work with    |
| Re      | x |                  |                   | BQS if the trend  |
| coverab | h |                  |                   | continues.        |
| le**](h | i |                  |                   | []{.mark}**       |
| ttp://b | b |                  |                   |                   |
| qs.usgs | i |                  |                   |                   |
| .gov/bs | t |                  |                   |                   |
| p/QADAT | a |                  |                   |                   |
| A_all/0 | n |                  |                   |                   |
| 5JAN/JA | u |                  |                   |                   |
| N05NWQL | p |                  |                   |                   |
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+---------+---+------------------+-------------------+-------------------+
| []      |   |                  |                   |                   |
| {.mark} |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [[]{#n  | * |                  | **The standards   | **The NWQL will   |
| wql1793 | * |                  | made on November  | work with BQS and |
| .ancho  | D |                  | 15th were         | Methods Research  |
| r}**Man | a |                  | verified and are  | and Development   |
| ganese, | t |                  | within acceptable | to determine the  |
| Fil     | a |                  | limits. Internal  | cause of the bias |
| tered** | s |                  | QC charts are     | observed on the   |
| ](http: | t |                  | within acceptable | BQS and NWQL      |
| //bqs.u | i |                  | limits but have   | charts.           |
| sgs.gov | l |                  | slightly low bias | []{.mark}**       |
| /bsp/QA | l |                  | for the 25 ug/L   |                   |
| DATA_al | d |                  | QC standard and   |                   |
| l/05JAN | e |                  | slightly high     |                   |
| /JAN05N | m |                  | bias for the 250  |                   |
| WQL0105 | o |                  | ug/L QC standard. |                   |
| 6G.gif) | n |                  | []{.mark}**       |                   |
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|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| *P      |   |                  |                   |                   |
| revious |   |                  |                   |                   |
| c       |   |                  |                   |                   |
| omments |   |                  |                   |                   |
| for     |   |                  |                   |                   |
| man     |   |                  |                   |                   |
| ganese, |   |                  |                   |                   |
| fi      |   |                  |                   |                   |
| ltered, |   |                  |                   |                   |
| ICP-MS, |   |                  |                   |                   |
| labcode |   |                  |                   |                   |
| 1793,   |   |                  |                   |                   |
| p       |   |                  |                   |                   |
| armcode |   |                  |                   |                   |
| 1056G*  |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| 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 17th,   | 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 internal QC | **The NWQL will   |
| wql2382 | * |                  | chart confirms    | work with BQS and |
| .ancho  | D |                  | the bias in the   | Methods Research  |
| r}**Man | a |                  | BQS chart.        | and Development   |
| ganese, | t |                  | []{.mark}**       | to determine the  |
| Whol    | a |                  |                   | cause of the bias |
| e-Water | i |                  |                   | observed on the   |
| Recove  | n |                  |                   | BQS and NWQL      |
| rable** | d |                  |                   | charts.**         |
| ](http: | i |                  |                   |                   |
| //bqs.u | c |                  |                   |                   |
| sgs.gov | a |                  |                   |                   |
| /bsp/QA | t |                  |                   |                   |
| DATA_al | e |                  |                   |                   |
| l/05JAN | a |                  |                   |                   |
| /JAN05N | n |                  |                   |                   |
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|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | o |                  |                   |                   |
|         | d |                  |                   |                   |
|         | b |                  |                   |                   |
|         | y |                  |                   |                   |
|         | I |                  |                   |                   |
|         | C |                  |                   |                   |
|         | P |                  |                   |                   |
|         | - |                  |                   |                   |
|         | M |                  |                   |                   |
|         | S |                  |                   |                   |
|         | b |                  |                   |                   |
|         | u |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | s |                  |                   |                   |
|         | n |                  |                   |                   |
|         | o |                  |                   |                   |
|         | t |                  |                   |                   |
|         | e |                  |                   |                   |
|         | v |                  |                   |                   |
|         | i |                  |                   |                   |
|         | d |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | f |                  |                   |                   |
|         | o |                  |                   |                   |
|         | r |                  |                   |                   |
|         | I |                  |                   |                   |
|         | C |                  |                   |                   |
|         | P |                  |                   |                   |
|         | . |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| []      |   |                  |                   |                   |
| {.mark} |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [[]{#n  | * |                  | **The NWQL QC     | **We have no      |
| wql2507 | * |                  | charts continue   | explanation for   |
| .ancho  | T |                  | to show the same  | the high          |
| r}**Str | h |                  | variability       | variability       |
| ontium, | e |                  | observed in the   | observed in the   |
| Fil     | v |                  | November QADATA   | BQS charts. We    |
| tered** | a |                  | Summary; however, | will continue to  |
| ](http: | r |                  | the 3.2% bias has | monitor for       |
| //bqs.u | i |                  | decreased. The QC | variability and   |
| sgs.gov | a |                  | for the runs with | review with BQS   |
| /bsp/QA | b |                  | the outlier BQS   | in one month.**   |
| DATA_al | i |                  | samples was       |                   |
| l/05JAN | l |                  | acceptable. There |                   |
| /JAN05N | i |                  | were no carryover |                   |
| WQL0108 | t |                  | problems or       |                   |
| 0I.gif) | y |                  | sample            |                   |
| *       | h |                  | mispours.**       |                   |
| *ICP-MS | a |                  |                   |                   |
| labcode | s |                  |                   |                   |
| 2507    | i |                  |                   |                   |
| p       | n |                  |                   |                   |
| armcode | c |                  |                   |                   |
| 1080I** | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | a |                  |                   |                   |
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|         | r |                  |                   |                   |
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|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
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|         | 5 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | % |                  |                   |                   |
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|         | r |                  |                   |                   |
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|         | s |                  |                   |                   |
|         | u |                  |                   |                   |
|         | l |                  |                   |                   |
|         | t |                  |                   |                   |
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|         | r |                  |                   |                   |
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|         | c |                  |                   |                   |
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|         | i |                  |                   |                   |
|         | v |                  |                   |                   |
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|         | d |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | c |                  |                   |                   |
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|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
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|         | l |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
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|         | A |                  |                   |                   |
|         | D |                  |                   |                   |
|         | A |                  |                   |                   |
|         | T |                  |                   |                   |
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|         | u |                  |                   |                   |
|         | t |                  |                   |                   |
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|         | f |                  |                   |                   |
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|         | + |                  |                   |                   |
|         | / |                  |                   |                   |
|         | - |                  |                   |                   |
|         | 2 |                  |                   |                   |
|         | f |                  |                   |                   |
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|         | u |                  |                   |                   |
|         | d |                  |                   |                   |
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|         | i |                  |                   |                   |
|         | g |                  |                   |                   |
|         | m |                  |                   |                   |
|         | a |                  |                   |                   |
|         | . |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| *P      |   |                  |                   |                   |
| revious |   |                  |                   |                   |
| c       |   |                  |                   |                   |
| omments |   |                  |                   |                   |
| for     |   |                  |                   |                   |
| str     |   |                  |                   |                   |
| ontium, |   |                  |                   |                   |
| fi      |   |                  |                   |                   |
| ltered, |   |                  |                   |                   |
| ICP-MS, |   |                  |                   |                   |
| labcode |   |                  |                   |                   |
| 2507,   |   |                  |                   |                   |
| p       |   |                  |                   |                   |
| armcode |   |                  |                   |                   |
| 1080I*  |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| 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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|         | 1 |                  |                   |                   |
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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 |                  |                   |                   |
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|         | - |                  |                   |                   |
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|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| []      |   |                  |                   |                   |
| {.mark} |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+

+---------+---+------------------+---+-----------------+---+-----------------+
| **Major | * |                  |   | **NWQL**        |   | **Corrective**  |
| De      | * |                  |   |                 |   |                 |
| termina | P |                  |   | **Comment**     |   | **Action**      |
| tions** | r |                  |   |                 |   |                 |
|         | o |                  |   |                 |   |                 |
|         | b |                  |   |                 |   |                 |
|         | l |                  |   |                 |   |                 |
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|         | m |                  |   |                 |   |                 |
|         | * |                  |   |                 |   |                 |
|         | * |                  |   |                 |   |                 |
+=========+===+==================+===+=================+===+=================+
| [[]{#n  | * |                  |   |                 |   |                 |
| wql1571 | * |                  |   |                 |   |                 |
| .anch   | R |                  |   |                 |   |                 |
| or}**Ch | e |                  |   |                 |   |                 |
| loride, | s |                  |   |                 |   |                 |
| Filter  | u |                  |   |                 |   |                 |
| ed**](h | l |                  |   |                 |   |                 |
| ttp://b | t |                  |   |                 |   |                 |
| qs.usgs | s |                  |   |                 |   |                 |
| .gov/bs | r |                  |   |                 |   |                 |
| p/QADAT | e |                  |   |                 |   |                 |
| A_all/0 | c |                  |   |                 |   |                 |
| 5JAN/JA | e |                  |   |                 |   |                 |
| N05NWQL | i |                  |   |                 |   |                 |
| 00940J. | v |                  |   |                 |   |                 |
| gif)**\ | e |                  |   |                 |   |                 |
| IC      | d |                  |   |                 |   |                 |
| labcode | s |                  |   |                 |   |                 |
| 1571    | i |                  |   |                 |   |                 |
| p       | n |                  |   |                 |   |                 |
| armcode | c |                  |   |                 |   |                 |
| 0940J** | e |                  |   |                 |   |                 |
|         | D |                  |   |                 |   |                 |
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|         | . |                  |   |                 |   |                 |
|         | * |                  |   |                 |   |                 |
|         | * |                  |   |                 |   |                 |
+---------+---+------------------+---+-----------------+---+-----------------+
| *P      |   |                  |   |                 |   |                 |
| revious |   |                  |   |                 |   |                 |
| c       |   |                  |   |                 |   |                 |
| omments |   |                  |   |                 |   |                 |
| for     |   |                  |   |                 |   |                 |
| ch      |   |                  |   |                 |   |                 |
| loride, |   |                  |   |                 |   |                 |
| fi      |   |                  |   |                 |   |                 |
| ltered, |   |                  |   |                 |   |                 |
| IC,     |   |                  |   |                 |   |                 |
| labcode |   |                  |   |                 |   |                 |
| 1571,   |   |                  |   |                 |   |                 |
| p       |   |                  |   |                 |   |                 |
| armcode |   |                  |   |                 |   |                 |
| 0940J*  |   |                  |   |                 |   |                 |
+---------+---+------------------+---+-----------------+---+-----------------+
| From    | T |                  |   | We reviewed the |   | We are working  |
|         | h |                  |   | run QC and we   |   | with BQS to     |
| >       | e |                  |   | do not see the  |   | identify the    |
|  QADATA | d |                  |   | same trends     |   | samples and we  |
| >       | a |                  |   | that are        |   | will            |
| Summary | t |                  |   | evident in the  |   | investigate     |
| > N     | a |                  |   | BQS samples.    |   | each one to     |
| ovember | i |                  |   |                 |   | identify any    |
| > 2004  | n |                  |   |                 |   | anomalies.      |
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+---------+---+------------------+---+-----------------+---+-----------------+
|         |   |                  |   |                 |   |                 |
+---------+---+------------------+---+-----------------+---+-----------------+
| [[]{#n  | * |                  |   | []{.mark}       |   | []{.mark}       |
| wql0663 | * |                  |   |                 |   |                 |
| .ancho  | R |                  |   |                 |   |                 |
| r}**Mag | e |                  |   |                 |   |                 |
| nesium, | s |                  |   |                 |   |                 |
| Fil     | u |                  |   |                 |   |                 |
| tered** | l |                  |   |                 |   |                 |
| ](http: | t |                  |   |                 |   |                 |
| //bqs.u | s |                  |   |                 |   |                 |
| sgs.gov | r |                  |   |                 |   |                 |
| /bsp/QA | e |                  |   |                 |   |                 |
| DATA_al | c |                  |   |                 |   |                 |
| l/05JAN | e |                  |   |                 |   |                 |
| /JAN05N | i |                  |   |                 |   |                 |
| WQL0092 | v |                  |   |                 |   |                 |
| 5C.gif) | e |                  |   |                 |   |                 |
| **ICP   | d |                  |   |                 |   |                 |
| labcode | s |                  |   |                 |   |                 |
| 0663    | i |                  |   |                 |   |                 |
| p       | n |                  |   |                 |   |                 |
| armcode | c |                  |   |                 |   |                 |
| 0925C** | e |                  |   |                 |   |                 |
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+---------+---+------------------+---+-----------------+---+-----------------+
| *P      |   |                  |   |                 |   |                 |
| revious |   |                  |   |                 |   |                 |
| c       |   |                  |   |                 |   |                 |
| omments |   |                  |   |                 |   |                 |
| for     |   |                  |   |                 |   |                 |
| mag     |   |                  |   |                 |   |                 |
| nesium, |   |                  |   |                 |   |                 |
| fi      |   |                  |   |                 |   |                 |
| ltered, |   |                  |   |                 |   |                 |
| ICP,    |   |                  |   |                 |   |                 |
| labcode |   |                  |   |                 |   |                 |
| 0663,   |   |                  |   |                 |   |                 |
| p       |   |                  |   |                 |   |                 |
| armcode |   |                  |   |                 |   |                 |
| 0925C*  |   |                  |   |                 |   |                 |
+---------+---+------------------+---+-----------------+---+-----------------+
| From    | T |                  |   | The negative    |   | NWQL will       |
|         | h |                  |   | bias is not     |   | continue to     |
| >       | e |                  |   | evident on NWQL |   | closely monitor |
|  QADATA | n |                  |   | QC charts at    |   | magnesium for a |
| >       | e |                  |   | the 0.5 mg/L    |   | bias.           |
| Summary | g |                  |   | level, which is |   |                 |
| > N     | a |                  |   | the             |   | []{.mark}       |
| ovember | t |                  |   | concentration   |   |                 |
| > 2004  | i |                  |   | where our TPC   |   |                 |
|         | v |                  |   | and CCV samples |   |                 |
|         | e |                  |   | are at.         |   |                 |
|         | b |                  |   | However, a      |   |                 |
|         | i |                  |   | slight negative |   |                 |
|         | a |                  |   | bias is evident |   |                 |
|         | s |                  |   | at the 5 mg/L   |   |                 |
|         | ( |                  |   | using a NIST    |   |                 |
|         | 5 |                  |   | standard as a   |   |                 |
|         | . |                  |   | check. New      |   |                 |
|         | 1 |                  |   | standards were  |   |                 |
|         | % |                  |   | prepared on     |   |                 |
|         | ) |                  |   | October 29th,   |   |                 |
|         | s |                  |   | 2004. Current   |   |                 |
|         | t |                  |   | QC data         |   |                 |
|         | a |                  |   | indicate the    |   |                 |
|         | r |                  |   | bias is \<2%.   |   |                 |
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| []      |   |                  |   |                 |   |                 |
| {.mark} |   |                  |   |                 |   |                 |
+---------+---+------------------+---+-----------------+---+-----------------+
| [[]{#n  | * |                  |   | **The NWQL QC   |   | **New standards |
| wql2773 | * |                  |   | charts show     |   | will be         |
| .ancho  | A |                  |   | less bias since |   | prepared and    |
| r}**Pot | p |                  |   | January 2005.   |   | verification    |
| assium, | o |                  |   | The charts also |   | initiated by    |
| Fil     | s |                  |   | show a decrease |   | Feb. 14,        |
| tered** | i |                  |   | in variability  |   | 2005.**         |
| ](http: | t |                  |   | since October   |   |                 |
| //bqs.u | i |                  |   | 2004.           |   | **We will       |
| sgs.gov | v |                  |   | []{.mark}**     |   | continue to     |
| /bsp/QA | e |                  |   |                 |   | monitor for     |
| DATA_al | b |                  |   |                 |   | bias after the  |
| l/05JAN | i |                  |   |                 |   | new standards   |
| /JAN05N | a |                  |   |                 |   | are prepared    |
| WQL0093 | s |                  |   |                 |   | and review the  |
| 5C.gif) | i |                  |   |                 |   | data with BQS   |
| **\     | s |                  |   |                 |   | in a month.**   |
| ICP     | s |                  |   |                 |   |                 |
| labcode | h |                  |   |                 |   |                 |
| 2773    | o |                  |   |                 |   |                 |
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| []      |   |                  |   |                 |   |                 |
| {.mark} |   |                  |   |                 |   |                 |
+---------+---+------------------+---+-----------------+---+-----------------+
| [[]{#n  | * |                  |   |                 |   |                 |
| wql0667 | * |                  |   |                 |   |                 |
| .an     | T |                  |   |                 |   |                 |
| chor}** | h |                  |   |                 |   |                 |
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| Filter  | p |                  |   |                 |   |                 |
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| qs.usgs | v |                  |   |                 |   |                 |
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| 00955D. | y |                  |   |                 |   |                 |
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| 0955D*  |   |                  |   |                 |   |                 |
+---------+---+------------------+---+-----------------+---+-----------------+
| From    | T |                  |   | A slight        |   | NWQL will       |
|         | h |                  |   | positive bias   |   | continue to     |
| >       | e |                  |   | of \<2% was     |   | closely monitor |
|  QADATA | d |                  |   | evident on NWQL |   | analysis.       |
| >       | a |                  |   | QC charts as    |   |                 |
| Summary | t |                  |   | well. New       |   | []{.mark}       |
| > N     | a |                  |   | standards were  |   |                 |
| ovember | i |                  |   | prepared on     |   | []{.mark}       |
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|         | v |                  |   | \<1% on         |   |                 |
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| [[]{#n  | * |                  |   | **We are aware  |   | **We are        |
| wql1572 | * |                  |   | of the slight   |   | currently       |
| .anc    | T |                  |   | negative**      |   | trouble         |
| hor}**S | h |                  |   |                 |   | shooting all    |
| ulfate, | e |                  |   | **bias. Bench   |   | aspects of the  |
| Filter  | d |                  |   | QC has shown    |   | analytical      |
| ed**](h | a |                  |   | negative bias   |   | method in an    |
| ttp://b | t |                  |   | at**            |   | effort to       |
| qs.usgs | a |                  |   |                 |   | identify the    |
| .gov/bs | s |                  |   | *               |   | source of the   |
| p/QADAT | h |                  |   | *concentrations |   | bias.**         |
| A_all/0 | o |                  |   | less than about |   |                 |
| 5JAN/JA | w |                  |   | 10 mg/L**.      |   | **As we make    |
| N05NWQL | t |                  |   |                 |   | adjustments, we |
| 00945G. | h |                  |   |                 |   | will continue   |
| gif)**\ | e |                  |   |                 |   | to monitor for  |
| IC      | n |                  |   |                 |   | improvements in |
| labcode | e |                  |   |                 |   | the bias.**     |
| 1572    | g |                  |   |                 |   |                 |
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|         | v |                  |   |                 |   |                 |
|         | e |                  |   |                 |   |                 |
|         | m |                  |   |                 |   |                 |
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|         | e |                  |   |                 |   |                 |
|         | r |                  |   |                 |   |                 |
|         | 2 |                  |   |                 |   |                 |
|         | 0 |                  |   |                 |   |                 |
|         | 0 |                  |   |                 |   |                 |
|         | 4 |                  |   |                 |   |                 |
|         | a |                  |   |                 |   |                 |
|         | r |                  |   |                 |   |                 |
|         | e |                  |   |                 |   |                 |
|         | b |                  |   |                 |   |                 |
|         | i |                  |   |                 |   |                 |
|         | a |                  |   |                 |   |                 |
|         | s |                  |   |                 |   |                 |
|         | e |                  |   |                 |   |                 |
|         | d |                  |   |                 |   |                 |
|         | n |                  |   |                 |   |                 |
|         | e |                  |   |                 |   |                 |
|         | g |                  |   |                 |   |                 |
|         | a |                  |   |                 |   |                 |
|         | t |                  |   |                 |   |                 |
|         | i |                  |   |                 |   |                 |
|         | v |                  |   |                 |   |                 |
|         | e |                  |   |                 |   |                 |
|         | b |                  |   |                 |   |                 |
|         | y |                  |   |                 |   |                 |
|         | 7 |                  |   |                 |   |                 |
|         | . |                  |   |                 |   |                 |
|         | 2 |                  |   |                 |   |                 |
|         | % |                  |   |                 |   |                 |
|         | . |                  |   |                 |   |                 |
|         | * |                  |   |                 |   |                 |
|         | * |                  |   |                 |   |                 |
+---------+---+------------------+---+-----------------+---+-----------------+
| *P      |   |                  |   |                 |   |                 |
| revious |   |                  |   |                 |   |                 |
| c       |   |                  |   |                 |   |                 |
| omments |   |                  |   |                 |   |                 |
| for     |   |                  |   |                 |   |                 |
| s       |   |                  |   |                 |   |                 |
| ulfate, |   |                  |   |                 |   |                 |
| fi      |   |                  |   |                 |   |                 |
| ltered, |   |                  |   |                 |   |                 |
| IC,     |   |                  |   |                 |   |                 |
| labcode |   |                  |   |                 |   |                 |
| 1572,   |   |                  |   |                 |   |                 |
| p       |   |                  |   |                 |   |                 |
| armcode |   |                  |   |                 |   |                 |
| 0945G*  |   |                  |   |                 |   |                 |
+---------+---+------------------+---+-----------------+---+-----------------+
| From    | D |                  |   |                 |   |                 |
|         | a |                  |   |                 |   |                 |
| >       | t |                  |   |                 |   |                 |
|  QADATA | a |                  |   |                 |   |                 |
| >       | a |                  |   |                 |   |                 |
| Summary | s |                  |   |                 |   |                 |
| > N     | o |                  |   |                 |   |                 |
| ovember | f |                  |   |                 |   |                 |
| > 2004  | m |                  |   |                 |   |                 |
|         | i |                  |   |                 |   |                 |
|         | d |                  |   |                 |   |                 |
|         | - |                  |   |                 |   |                 |
|         | A |                  |   |                 |   |                 |
|         | u |                  |   |                 |   |                 |
|         | g |                  |   |                 |   |                 |
|         | u |                  |   |                 |   |                 |
|         | s |                  |   |                 |   |                 |
|         | t |                  |   |                 |   |                 |
|         | 2 |                  |   |                 |   |                 |
|         | 0 |                  |   |                 |   |                 |
|         | 0 |                  |   |                 |   |                 |
|         | 4 |                  |   |                 |   |                 |
|         | e |                  |   |                 |   |                 |
|         | x |                  |   |                 |   |                 |
|         | h |                  |   |                 |   |                 |
|         | i |                  |   |                 |   |                 |
|         | b |                  |   |                 |   |                 |
|         | i |                  |   |                 |   |                 |
|         | t |                  |   |                 |   |                 |
|         | n |                  |   |                 |   |                 |
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|         | i |                  |   |                 |   |                 |
|         | a |                  |   |                 |   |                 |
|         | s |                  |   |                 |   |                 |
|         | a |                  |   |                 |   |                 |
|         | n |                  |   |                 |   |                 |
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|         | n |                  |   |                 |   |                 |
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|         | s |                  |   |                 |   |                 |
|         | a |                  |   |                 |   |                 |
|         | r |                  |   |                 |   |                 |
|         | y |                  |   |                 |   |                 |
|         | . |                  |   |                 |   |                 |
+---------+---+------------------+---+-----------------+---+-----------------+
| From    | T |                  |   | We reviewed     |   | We have no      |
|         | h |                  |   | internal QC to  |   | explanation of  |
| >       | e |                  |   | help evaluate   |   | the bias, or    |
|  QADATA | c |                  |   | the observed    |   | why it is only  |
| >       | h |                  |   | bias. Our data  |   | evident in the  |
| Summary | a |                  |   | indicates a     |   | middle of the   |
| > Se    | r |                  |   | bias of about   |   | analytical      |
| ptember | t |                  |   | 3% or less, in  |   | range. We will  |
| > 2004  | i |                  |   | only the        |   | continue to     |
|         | n |                  |   | midsection of   |   | monitor the     |
|         | d |                  |   | the analytical  |   | situation and   |
|         | i |                  |   | range. We also  |   | attempt to find |
|         | c |                  |   | noticed         |   | the cause.      |
|         | a |                  |   | increased       |   |                 |
|         | t |                  |   | variability     |   |                 |
|         | e |                  |   | during the      |   |                 |
|         | s |                  |   | period of the   |   |                 |
|         | a |                  |   | observed bias.  |   |                 |
|         | s |                  |   | We are          |   |                 |
|         | l |                  |   | currently       |   |                 |
|         | i |                  |   | implementing    |   |                 |
|         | g |                  |   | new instruments |   |                 |
|         | h |                  |   | on this         |   |                 |
|         | t |                  |   | analytical      |   |                 |
|         | n |                  |   | line, and will  |   |                 |
|         | e |                  |   | eliminate use   |   |                 |
|         | g |                  |   | of the          |   |                 |
|         | a |                  |   | instrument      |   |                 |
|         | t |                  |   | producing the   |   |                 |
|         | i |                  |   | observed bias   |   |                 |
|         | v |                  |   | in the next few |   |                 |
|         | e |                  |   | months.         |   |                 |
|         | b |                  |   |                 |   |                 |
|         | i |                  |   |                 |   |                 |
|         | a |                  |   |                 |   |                 |
|         | s |                  |   |                 |   |                 |
|         | ( |                  |   |                 |   |                 |
|         | 4 |                  |   |                 |   |                 |
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|         | 4 |                  |   |                 |   |                 |
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|         | o |                  |   |                 |   |                 |
|         | w |                  |   |                 |   |                 |
|         | t |                  |   |                 |   |                 |
|         | h |                  |   |                 |   |                 |
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|         | M |                  |   |                 |   |                 |
|         | P |                  |   |                 |   |                 |
|         | V |                  |   |                 |   |                 |
|         | . |                  |   |                 |   |                 |
+---------+---+------------------+---+-----------------+---+-----------------+
|         |   |                  |   |                 |   |                 |
+---------+---+------------------+---+-----------------+---+-----------------+

######