##### QADATA Summary -- August 2008

The Inorganic Blind Sample Project (IBSP) of the Branch of Quality
Systems reviews about 90 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 01/01/08
through 07/31/08; however, longer-range charts may be 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 NWQL are removed from the
charts.

In this report, the "Problem" is determined and written by the IBSP and
then sent to the NWQL. The NWQL then gets two weeks to respond to the
issue by writing an "NWQL Comment" and a "Corrective Action." Comments
from the NWQL 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. Approximately one month after
the QADATA Summary is distributed, the NWQL and IBSP personnel usually
meet to follow-up on corrective actions and on how the corrective
actions are affecting subsequent data.

Current charts (updated twice weekly) may be accessed at
<http://bqs.usgs.gov/bsp/Controlcharts.htm>. Laboratory and district
personnel may have their own custom quality-assurance data retrieval to
parallel their objectives by contacting Ted Struzeski (303.236.1872,
<struzesk@usgs.gov>). 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

Trace Metals

[Iron, Filtered,](#nwql0645) ICP, Labcode 0645, Parmcode 01046PLA11 4

[Manganese, Filtered,](#nwql0648) ICP, Labcode 0648, Parmcode 01056PLA11
4

[Nickel, Unfiltered,](#nwql3131) cICP-MS, Labcode 3131, Parmcode
01067PLM11 5

[Strontium, Unfiltered,](#nwql2387) ICP-MS, Labcode 2387, Parmcode
01082PLM48 5

[Uranium, Filtered,](#nwql1797) ICP-MS, Labcode 1797, Parmcode
22703PLM43 5

[Vanadium, Unfiltered,](#nwql3134) cICP-MS, Labcode 3135, Parmcode
01087PLM11 6

[Vanadium, Unfiltered,](#nwql2370) ICP, Labcode 2370, Parmcode
01087PLM15 6

[Zinc, Filtered,](#nwql3138) cICP-MS, Labcode 3138, Parmcode 01090PLM10
7

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

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

1.  [Iron,](http://bqs.usgs.gov/bsp/QADATA_all/08Aug/Aug08NWQL01046PLA11.gif)
    filtered, ICP, parmcode 1046PLA11-- Sharp downward trend and
    increased variability starting late February 2008.

2.  [Nickel,](http://bqs.usgs.gov/bsp/QADATA_all/08Aug/Aug08BBP_NiU_01067PLM11.xls)
    unfiltered, cICP-MS, parmcode 01067PLM11 -- Blind blanks exhibit 33%
    false positive rate starting April 2008.

3.  [Strontium,](http://bqs.usgs.gov/bsp/QADATA_all/08Aug/Aug08BBP_SrU_01082PLM48.xls)
    unfiltered, ICP-MS, parmcode 01082PLM48 -- Blind blanks show 30%
    false positive rate starting March 2008.

4.  [Vanadium,](http://bqs.usgs.gov/bsp/QADATA_all/08Aug/Aug08BBP_VU_01087PLM11.xls)
    unfiltered, cICP-MS, parmcode 01087PLM11 -- Blind blanks demonstrate
    65% false positive rate starting November 2007.

5.  [Vanadium,](http://bqs.usgs.gov/bsp/QADATA_all/08Aug/Aug08BBP_VU_01087PLM15.xls)
    unfiltered, ICP, parmcode 01087PLM15 -- Blind blanks show 24% false
    positive rate starting mid November 2007.

6.  [Zinc,](http://bqs.usgs.gov/bsp/QADATA_all/08Aug/Aug08NWQL01090PLM10.gif)
    filtered, cICP-MS, parmcode 01090PLM10 -- Positive bias for more
    than 18 months. Current bias is 11%.

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 Comment**  | **Corrective      |
| Metal   | * |                  |                   | Action**          |
| De      | P |                  |                   |                   |
| termina | r |                  |                   |                   |
| tions** | o |                  |                   |                   |
|         | b |                  |                   |                   |
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|         | e |                  |                   |                   |
|         | m |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+=========+===+==================+===================+===================+
| [[]{#n  | * |                  | **Dilutions on    | **NWQL will use   |
| wql0645 | * |                  | our third-party   | blank water from  |
| .       | T |                  | check showed no   | different sources |
| anchor} | h |                  | bias, but there   | and use this      |
| **Iron, | e |                  | had been          | water to make new |
| Filtere | r |                  | maintenance       | calibration       |
| d**](ht | e |                  | performed on the  | standards. We     |
| tp://bq | s |                  | instrument prior  | will also test    |
| s.usgs. | u |                  | to the test. New  | the source of     |
| gov/bsp | l |                  | calibrants have   | current blank     |
| /QADATA | t |                  | also been made.   | water by a        |
| _all/08 | s |                  | These actions     | different         |
| Aug/Aug | c |                  | have brought iron | technology        |
| 08NWQL0 | o |                  | back within the   | (method).**       |
| 1046PLA | n |                  | acceptance range, |                   |
| 11.gif) | t |                  | but blind results |                   |
| **ICP   | i |                  | are still showing |                   |
| labcode | n |                  | a low bias on BQS |                   |
| 0645    | u |                  | charts and no     |                   |
| p       | e |                  | bias on internal  |                   |
| armcode | t |                  | charts. Internal  |                   |
| 1046    | o |                  | charts and BQS    |                   |
| PLA11** | d |                  | charts are based  |                   |
|         | e |                  | on samples at     |                   |
|         | m |                  | different         |                   |
|         | o |                  | concentrations    |                   |
|         | n |                  | (500 ug/L for the |                   |
|         | s |                  | internal charts   |                   |
|         | t |                  | versus 38 -- 208  |                   |
|         | r |                  | ug/L for the BQS  |                   |
|         | a |                  | charts) and this  |                   |
|         | t |                  | may indicate a    |                   |
|         | e |                  | bias at the lower |                   |
|         | a |                  | concentrations.** |                   |
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+---------+---+------------------+-------------------+-------------------+
| *P      |   |                  |                   |                   |
| revious |   |                  |                   |                   |
| c       |   |                  |                   |                   |
| omments |   |                  |                   |                   |
| for     |   |                  |                   |                   |
| iron,   |   |                  |                   |                   |
| fi      |   |                  |                   |                   |
| ltered, |   |                  |                   |                   |
| labcode |   |                  |                   |                   |
| 0645,   |   |                  |                   |                   |
| p       |   |                  |                   |                   |
| armcode |   |                  |                   |                   |
| 0104    |   |                  |                   |                   |
| 6PLA11* |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | R |                  | On-line charts do | We will dilute    |
|         | e |                  | not show this     | one of our        |
| QADATA  | s |                  | trend, but the    | third-party-check |
| Summary | u |                  | references used   | samples to match  |
| June    | l |                  | are at higher     | the               |
| 2008    | t |                  | concentrations    | concentrations    |
|         | s |                  | than those used   | commonly found in |
|         | r |                  | by BQS.           | the BQS check     |
|         | e |                  |                   | samples and       |
|         | c |                  |                   | perform multiple  |
|         | e |                  |                   | analyses for      |
|         | i |                  |                   | comparison. We    |
|         | v |                  |                   | will also check   |
|         | e |                  |                   | our calibration   |
|         | d |                  |                   | standards by a    |
|         | s |                  |                   | different         |
|         | i |                  |                   | analytical        |
|         | n |                  |                   | method. Outcomes  |
|         | c |                  |                   | of these tests    |
|         | e |                  |                   | will determine    |
|         | t |                  |                   | our next steps.   |
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+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [[]{#n  | * |                  | **Internal charts | **NWQL will use   |
| wql0648 | * |                  | show no bias, but | blank water from  |
| .ancho  | A |                  | BQS samples are   | different sources |
| r}**Man | s |                  | at a much lower   | and use this      |
| ganese, | l |                  | concentration     | water to make new |
| Filtere | i |                  | (250 ug/L for the | calibration       |
| d**](ht | g |                  | internal charts   | standards. We     |
| tp://bq | h |                  | vs 8 - 38 ug/L    | will also test    |
| s.usgs. | t |                  | for the BQS       | the source of     |
| gov/bsp | n |                  | charts). This may | current blank     |
| /QADATA | e |                  | indicate a bias   | water by a        |
| _all/08 | g |                  | at the lower      | different         |
| Aug/Aug | a |                  | concentrations.** | technology        |
| 08NWQL0 | t |                  |                   | (method).**       |
| 1056PLA | i |                  |                   |                   |
| 11.gif) | v |                  |                   |                   |
| **ICP   | e |                  |                   |                   |
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+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [[]{#n  | * |                  | **We performed    | **NWQL will       |
| wql3131 | * |                  | maintenance on    | continue to       |
| .an     | S |                  | the instrument    | monitor this      |
| chor}** | i |                  | that initially    | analysis.**       |
| Nickel, | n |                  | appears to have   |                   |
| Unfilt  | c |                  | improved this     |                   |
| ered**] | e |                  | analysis.**       |                   |
| (http:/ | A |                  |                   |                   |
| /bqs.us | p |                  |                   |                   |
| gs.gov/ | r |                  |                   |                   |
| bsp/QAD | i |                  |                   |                   |
| ATA_all | l |                  |                   |                   |
| /08Aug/ | 2 |                  |                   |                   |
| Aug08BB | 0 |                  |                   |                   |
| P_NiU_0 | 0 |                  |                   |                   |
| 1067PLM | 8 |                  |                   |                   |
| 11.xls) | , |                  |                   |                   |
| **      | a |                  |                   |                   |
| cICP-MS | f |                  |                   |                   |
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+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [[]{#n  | * |                  | **We performed    | **NWQL will       |
| wql2387 | * |                  | maintenance on    | continue to       |
| .ancho  | S |                  | the instrument    | monitor this      |
| r}**Str | i |                  | that initially    | analysis.**       |
| ontium, | n |                  | appears to have   |                   |
| Unfilt  | c |                  | improved this     |                   |
| ered**] | e |                  | analysis.**       |                   |
| (http:/ | M |                  |                   |                   |
| /bqs.us | a |                  |                   |                   |
| gs.gov/ | r |                  |                   |                   |
| bsp/QAD | c |                  |                   |                   |
| ATA_all | h |                  |                   |                   |
| /08Aug/ | 2 |                  |                   |                   |
| Aug08BB | 0 |                  |                   |                   |
| P_SrU_0 | 0 |                  |                   |                   |
| 1082PLM | 8 |                  |                   |                   |
| 48.xls) | , |                  |                   |                   |
| *       | a |                  |                   |                   |
| *ICP-MS | f |                  |                   |                   |
| labcode | a |                  |                   |                   |
| 2387    | l |                  |                   |                   |
| p       | s |                  |                   |                   |
| armcode | e |                  |                   |                   |
| 01082   | p |                  |                   |                   |
| PLM48** | o |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | t |                  |                   |                   |
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|         | 3 |                  |                   |                   |
|         | 0 |                  |                   |                   |
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|         | 8 |                  |                   |                   |
|         | . |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [[]{#n  | * |                  |                   | **NWQL will       |
| wql1797 | * |                  |                   | continue to       |
| .anc    | C |                  |                   | monitor this      |
| hor}**U | o |                  |                   | analysis.**       |
| ranium, | r |                  |                   |                   |
| Filtere | r |                  |                   |                   |
| d**](ht | e |                  |                   |                   |
| tp://bq | c |                  |                   |                   |
| s.usgs. | t |                  |                   |                   |
| gov/bsp | i |                  |                   |                   |
| /QADATA | v |                  |                   |                   |
| _all/08 | e |                  |                   |                   |
| Aug/Aug | a |                  |                   |                   |
| 08NWQL2 | c |                  |                   |                   |
| 2703PLM | t |                  |                   |                   |
| 43.gif) | i |                  |                   |                   |
| *       | o |                  |                   |                   |
| *ICP-MS | n |                  |                   |                   |
| labcode | s |                  |                   |                   |
| 1797    | t |                  |                   |                   |
| p       | a |                  |                   |                   |
| armcode | k |                  |                   |                   |
| 22703   | e |                  |                   |                   |
| PLM43** | n |                  |                   |                   |
|         | b |                  |                   |                   |
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|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| *P      |   |                  |                   |                   |
| revious |   |                  |                   |                   |
| c       |   |                  |                   |                   |
| omments |   |                  |                   |                   |
| for     |   |                  |                   |                   |
| u       |   |                  |                   |                   |
| ranium, |   |                  |                   |                   |
| fi      |   |                  |                   |                   |
| ltered, |   |                  |                   |                   |
| labcode |   |                  |                   |                   |
| 1797,   |   |                  |                   |                   |
| p       |   |                  |                   |                   |
| armcode |   |                  |                   |                   |
| 2270    |   |                  |                   |                   |
| 3PLM43* |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | T |                  | On-line charts    | New standards     |
|         | h |                  | show the same     | have been made    |
| QADATA  | e |                  | trend and the     | and the analysis  |
| Summary | d |                  | analyst has       | will be monitored |
| June    | a |                  | already made new  | to ensure that    |
| 2008    | t |                  | calibration       | the noted bias    |
|         | a |                  | standards that    | has been          |
|         | d |                  | appear to have    | corrected.        |
|         | e |                  | corrected this    |                   |
|         | m |                  | slight bias.      |                   |
|         | o |                  |                   |                   |
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+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [[]{#n  | * |                  | **We performed    | **The IRL may be  |
| wql3134 | * |                  | maintenance on    | changed to an     |
| .anch   | H |                  | the instrument    | LT-MDL of 0.5     |
| or}**Va | i |                  | that initially    | ug/l for the next |
| nadium, | g |                  | appears to have   | water year.**     |
| Unfil   | h |                  | improved this     |                   |
| tered** | v |                  | analysis, but     |                   |
| ](http: | a |                  | data indicate     |                   |
| //bqs.u | r |                  | that the IRL of   |                   |
| sgs.gov | i |                  | 0.1 ug/L may be   |                   |
| /bsp/QA | a |                  | changed to an     |                   |
| DATA_al | b |                  | LT-MDL of 0.5     |                   |
| l/08Aug | i |                  | ug/l for the next |                   |
| /Aug08B | l |                  | water year.**     |                   |
| BP_VU_0 | i |                  |                   |                   |
| 1087PLM | t |                  |                   |                   |
| 11.xls) | y |                  |                   |                   |
| **      | a |                  |                   |                   |
| cICP-MS | n |                  |                   |                   |
| labcode | d |                  |                   |                   |
| 3135    | a |                  |                   |                   |
| p       | p |                  |                   |                   |
| armcode | o |                  |                   |                   |
| 01087   | s |                  |                   |                   |
| PLM11** | i |                  |                   |                   |
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|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| *P      |   |                  |                   |                   |
| revious |   |                  |                   |                   |
| c       |   |                  |                   |                   |
| omments |   |                  |                   |                   |
| for     |   |                  |                   |                   |
| va      |   |                  |                   |                   |
| nadium, |   |                  |                   |                   |
| unfi    |   |                  |                   |                   |
| ltered, |   |                  |                   |                   |
| labcode |   |                  |                   |                   |
| 3135,   |   |                  |                   |                   |
| p       |   |                  |                   |                   |
| armcode |   |                  |                   |                   |
| 0108    |   |                  |                   |                   |
| 7PLM11* |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | T |                  | After             | IRL will be       |
|         | h |                  | consultation with | changed to 0.5    |
| QADATA  | e |                  | the BQS the       | ug/L              |
| Summary | h |                  | Interim Reporting |                   |
| June    | i |                  | Level for this    |                   |
| 2008    | g |                  | analysis will be  |                   |
|         | h |                  | changed to 0.5    |                   |
|         | v |                  | ug/L to more      |                   |
|         | a |                  | accurately        |                   |
|         | r |                  | reflect actual    |                   |
|         | i |                  | performance.      |                   |
|         | a |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | l |                  |                   |                   |
|         | i |                  |                   |                   |
|         | t |                  |                   |                   |
|         | y |                  |                   |                   |
|         | a |                  |                   |                   |
|         | n |                  |                   |                   |
|         | d |                  |                   |                   |
|         | p |                  |                   |                   |
|         | o |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
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|         | i |                  |                   |                   |
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|         | 2 |                  |                   |                   |
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|         | , |                  |                   |                   |
|         | 2 |                  |                   |                   |
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|         | t |                  |                   |                   |
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|         | 3 |                  |                   |                   |
|         | 1 |                  |                   |                   |
|         | r |                  |                   |                   |
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|         | l |                  |                   |                   |
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|         | 6 |                  |                   |                   |
|         | 5 |                  |                   |                   |
|         | % |                  |                   |                   |
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|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | H |                  | The IRL of 0.1    | We will work with |
|         | i |                  | ug/L was an       | BQS to evaluate   |
| QADATA  | g |                  | estimate when the | the IRL and       |
| Summary | h |                  | analytical system | change it if      |
| April   | v |                  | was put on-line   | appropriate.      |
| 2008    | a |                  | in September of   |                   |
|         | r |                  | 2006 and most     |                   |
|         | i |                  | likely incorrect. |                   |
|         | a |                  | This IRL may need |                   |
|         | b |                  | to be raised.     |                   |
|         | i |                  |                   |                   |
|         | l |                  |                   |                   |
|         | i |                  |                   |                   |
|         | t |                  |                   |                   |
|         | y |                  |                   |                   |
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|         | n |                  |                   |                   |
|         | d |                  |                   |                   |
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|         | t |                  |                   |                   |
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|         | v |                  |                   |                   |
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|         | i |                  |                   |                   |
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|         | s |                  |                   |                   |
|         | a |                  |                   |                   |
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|         | s |                  |                   |                   |
|         | h |                  |                   |                   |
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|         | l |                  |                   |                   |
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|         | b |                  |                   |                   |
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|         | 2 |                  |                   |                   |
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|         | , |                  |                   |                   |
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|         | i |                  |                   |                   |
|         | s |                  |                   |                   |
|         | d |                  |                   |                   |
|         | e |                  |                   |                   |
|         | m |                  |                   |                   |
|         | o |                  |                   |                   |
|         | n |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | r |                  |                   |                   |
|         | a |                  |                   |                   |
|         | t |                  |                   |                   |
|         | e |                  |                   |                   |
|         | d |                  |                   |                   |
|         | f |                  |                   |                   |
|         | o |                  |                   |                   |
|         | r |                  |                   |                   |
|         | b |                  |                   |                   |
|         | l |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | d |                  |                   |                   |
|         | b |                  |                   |                   |
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|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | H |                  | We are seeing     | We will monitor   |
|         | i |                  | this with our     | the instrument    |
| QADATA  | g |                  | blanks as well.   | closely after the |
| Summary | h |                  | We believe that   | maintenance and   |
| F       | v |                  | the variability   | take appropriate  |
| ebruary | a |                  | is instrumental   | steps based on    |
| 2008    | r |                  | and have          | the information   |
|         | i |                  | contacted the     | gathered at that  |
|         | a |                  | manufacturer to   | time.             |
|         | b |                  | have maintenance  |                   |
|         | i |                  | performed. If the |                   |
|         | l |                  | variability is    |                   |
|         | i |                  | related to the    |                   |
|         | t |                  | instrument aging, |                   |
|         | y |                  | we may need to    |                   |
|         | a |                  | raise the IRL for |                   |
|         | n |                  | this element.     |                   |
|         | d |                  |                   |                   |
|         | a |                  |                   |                   |
|         | p |                  |                   |                   |
|         | o |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
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|         | b |                  |                   |                   |
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|         | 2 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 0 |                  |                   |                   |
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|         | , |                  |                   |                   |
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|         | l |                  |                   |                   |
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+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [[]{#n  | * |                  |                   | **NWQL will       |
| wql2370 | * |                  |                   | continue to       |
| .anch   | F |                  |                   | monitor this      |
| or}**Va | o |                  |                   | analysis.**       |
| nadium, | r |                  |                   |                   |
| Unfil   | b |                  |                   |                   |
| tered** | l |                  |                   |                   |
| ](http: | i |                  |                   |                   |
| //bqs.u | n |                  |                   |                   |
| sgs.gov | d |                  |                   |                   |
| /bsp/QA | b |                  |                   |                   |
| DATA_al | l |                  |                   |                   |
| l/08Aug | a |                  |                   |                   |
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| BP_VU_0 | k |                  |                   |                   |
| 1087PLM | s |                  |                   |                   |
| 15.xls) | , |                  |                   |                   |
| **ICP   | a |                  |                   |                   |
| labcode | l |                  |                   |                   |
| 2370    | l |                  |                   |                   |
| p       | r |                  |                   |                   |
| armcode | e |                  |                   |                   |
| 01087   | s |                  |                   |                   |
| PLM15** | u |                  |                   |                   |
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|         | A |                  |                   |                   |
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|         | d |                  |                   |                   |
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|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | r |                  |                   |                   |
|         | i |                  |                   |                   |
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|         | d |                  |                   |                   |
|         | . |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| *P      |   |                  |                   |                   |
| revious |   |                  |                   |                   |
| c       |   |                  |                   |                   |
| omments |   |                  |                   |                   |
| for     |   |                  |                   |                   |
| va      |   |                  |                   |                   |
| nadium, |   |                  |                   |                   |
| unfi    |   |                  |                   |                   |
| ltered, |   |                  |                   |                   |
| labcode |   |                  |                   |                   |
| 2370,   |   |                  |                   |                   |
| p       |   |                  |                   |                   |
| armcode |   |                  |                   |                   |
| 0108    |   |                  |                   |                   |
| 7PLM15* |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | A |                  | In November of    | We will contact   |
|         | l |                  | 2007 periodic     | the service       |
| QADATA  | t |                  | maintenance was   | representative    |
| Summary | h |                  | performed and a   | for assistance.   |
| June    | o |                  | number of         |                   |
| 2008    | u |                  | adjustments were  |                   |
|         | g |                  | made, including   |                   |
|         | h |                  | rebuilding the    |                   |
|         | t |                  | torch. It is      |                   |
|         | h |                  | possible that the |                   |
|         | e |                  | PM caused a       |                   |
|         | v |                  | change in the     |                   |
|         | a |                  | ability to        |                   |
|         | r |                  | analyze for       |                   |
|         | i |                  | vanadium.         |                   |
|         | a |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | l |                  |                   |                   |
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|         | b |                  |                   |                   |
|         | l |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | d |                  |                   |                   |
|         | b |                  |                   |                   |
|         | l |                  |                   |                   |
|         | a |                  |                   |                   |
|         | n |                  |                   |                   |
|         | k |                  |                   |                   |
|         | s |                  |                   |                   |
|         | h |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | l |                  |                   |                   |
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+---------+---+------------------+-------------------+-------------------+
| From    | S |                  | On-line blanks    | We will review    |
|         | i |                  | show no change,   | the sample        |
| QADATA  | n |                  | but we will       | digestion and     |
| Summary | c |                  | review the sample | analysis          |
| April   | e |                  | digestion and     | processes to look |
| 2008    | m |                  | analysis          | for possible      |
|         | i |                  | processes to look | causes and we     |
|         | d |                  | for possible      | will continue to  |
|         | N |                  | causes for the    | monitor this      |
|         | o |                  | change in the     | analysis.         |
|         | v |                  | blind-blank       |                   |
|         | e |                  | results.          |                   |
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+---------+---+------------------+-------------------+-------------------+
| []      |   |                  |                   |                   |
| {.mark} |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [[]{#n  |   | **The high       | **Charts indicate | **Since the BQS   |
| wql3138 |   | variability has  | that variability  | blind RA samples  |
| .       |   | improved to      | has been reduced  | do not show a     |
| anchor} |   | normal levels    | and the method is | similar bias the  |
| **Zinc, |   | with all results | operating within  | NWQL will analyze |
| Filtere |   | received since   | acceptance        | some BQS RA       |
| d**](ht |   | the last         | criteria. BQS     | samples using the |
| tp://bq |   | assessment       | blind samples     | FA method and     |
| s.usgs. |   | within\          | indicate a high   | some FA samples   |
| gov/bsp |   | +/- 2            | bias, on-line     | by the RA method. |
| /QADATA |   | f-pseudosigmas.  | charts show a     | Results should    |
| _all/08 |   | However, the     | slight low bias.  | help narrow the   |
| Aug/Aug |   | long-term        | Since the BQS     | possible          |
| 08NWQL0 |   | positive bias is | blind RA samples  | causes.**         |
| 1090PLM |   | still present.   | do not show a     |                   |
| 10.gif) |   | The most recent  | similar bias the  |                   |
| **      |   | data show a      | NWQL will analyze |                   |
| cICP-MS |   | positive bias of | some BQS RA       |                   |
| labcode |   | 11.3%, on        | samples using the |                   |
| 3138    |   | average, above   | FA method and     |                   |
| p       |   | the target       | some FA samples   |                   |
| armcode |   | value.**         | by the RA method. |                   |
| 01090   |   |                  | Results should    |                   |
| PLM10** |   | **The same       | help narrow the   |                   |
|         |   | reference        | possible          |                   |
|         |   | material is      | causes.**         |                   |
|         |   | submitted for    |                   |                   |
|         |   | analysis for     |                   |                   |
|         |   | unfiltered zinc  |                   |                   |
|         |   | by cICP-MS ([pc  |                   |                   |
|         |   | 1092PLM11)](     |                   |                   |
|         |   | http://bqs.usgs. |                   |                   |
|         |   | gov/bsp/QADATA_a |                   |                   |
|         |   | ll/08Aug/Aug08NW |                   |                   |
|         |   | QL01092PLM11.gif |                   |                   |
|         |   | )[,]{.underline} |                   |                   |
|         |   | and the data do  |                   |                   |
|         |   | not show this    |                   |                   |
|         |   | bias.**          |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| *P      |   |                  |                   |                   |
| revious |   |                  |                   |                   |
| c       |   |                  |                   |                   |
| omments |   |                  |                   |                   |
| for     |   |                  |                   |                   |
| zinc,   |   |                  |                   |                   |
| fi      |   |                  |                   |                   |
| ltered, |   |                  |                   |                   |
| labcode |   |                  |                   |                   |
| 3138,   |   |                  |                   |                   |
| p       |   |                  |                   |                   |
| armcode |   |                  |                   |                   |
| 0109    |   |                  |                   |                   |
| 0PLM10* |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | * |                  | On-line           | We will purchase  |
|         | T |                  | third-party-check | a NIST traceable  |
| QADATA  | h |                  | samples show a    | standard from a   |
| Summary | i |                  | slight low bias.  | different vendor  |
| June    | s |                  | Blind blanks and  | and test BQS      |
| 2008    | m |                  | on-line blanks do | samples and the   |
|         | e |                  | not show any      | current on-line   |
|         | t |                  | bias.             | check samples to  |
|         | h |                  |                   | determine where   |
|         | o |                  |                   | the discrepancy   |
|         | d |                  |                   | is.               |
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+---------+---+------------------+-------------------+-------------------+
| From    | T |                  | On-line charts    | We will continue  |
|         | h |                  | show similar      | to monitor this   |
| QADATA  | e |                  | improvement.      | line to ensure    |
| Summary | p |                  |                   | that the          |
| April   | o |                  |                   | improvement       |
| 2008    | s |                  |                   | continues.        |
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+---------+---+------------------+-------------------+-------------------+
| From    | T |                  | We have looked at | It will take 2-3  |
|         | h |                  | a number of       | more weeks of     |
| QADATA  | e |                  | possible causes,  | data to ensure    |
| Summary | p |                  | but none of the   | that this         |
| F       | o |                  | attempted         | solution is       |
| ebruary | s |                  | corrections has   | working. We will  |
| 2008    | i |                  | been proven to    | continue to       |
|         | t |                  | correct the issue | monitor this line |
|         | i |                  | yet. The most     | closely and if    |
|         | v |                  | recent            | the line is still |
|         | e |                  | modification to   | having problems   |
|         | b |                  | the calibration   | we will request   |
|         | i |                  | procedure is      | input from the    |
|         | a |                  | showing promise,  | Quality Assurance |
|         | s |                  | but we want to    | Section of the    |
|         | c |                  | see more data to  | NWQL on March 11, |
|         | o |                  | be sure.          | 2008.             |
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|         | L |                  |                   |                   |
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|         | 1 |                  |                   |                   |
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|         | 9 |                  |                   |                   |
|         | 2 |                  |                   |                   |
|         | P |                  |                   |                   |
|         | L |                  |                   |                   |
|         | M |                  |                   |                   |
|         | 1 |                  |                   |                   |
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|         | e |                  |                   |                   |
|         | x |                  |                   |                   |
|         | h |                  |                   |                   |
|         | i |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | g |                  |                   |                   |
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|         | h |                  |                   |                   |
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|         | s |                  |                   |                   |
|         | b |                  |                   |                   |
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|         | a |                  |                   |                   |
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|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
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|         | y |                  |                   |                   |
|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | T |                  | On-line QC charts | The NWQL will     |
|         | h |                  | indicate the bias | continue to       |
| QADATA  | e |                  | does not appear   | monitor the       |
| Summary | p |                  | to be related to  | instrument for    |
| D       | o |                  | standards. The    | bias.             |
| ecember | s |                  | bias also does    |                   |
| 2007    | i |                  | not seem to be    |                   |
|         | t |                  | related to        |                   |
|         | i |                  | carry-over or     |                   |
|         | v |                  | contamination.    |                   |
|         | e |                  | The analyst is    |                   |
|         | b |                  | investigating the |                   |
|         | i |                  | possibility of    |                   |
|         | a |                  | interference,     |                   |
|         | s |                  | however, the      |                   |
|         | d |                  | instrument is     |                   |
|         | i |                  | currently         |                   |
|         | s |                  | undergoing        |                   |
|         | p |                  | repair. More      |                   |
|         | l |                  | research needs to |                   |
|         | a |                  | be conducted as   |                   |
|         | y |                  | soon as the       |                   |
|         | e |                  | instrument is     |                   |
|         | d |                  | operational       |                   |
|         | s |                  | again.            |                   |
|         | i |                  |                   |                   |
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|         | c |                  |                   |                   |
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|         | r |                  |                   |                   |
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|         | 0 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 7 |                  |                   |                   |
|         | h |                  |                   |                   |
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|         | n |                  |                   |                   |
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|         | I |                  |                   |                   |
|         | C |                  |                   |                   |
|         | P |                  |                   |                   |
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|         | M |                  |                   |                   |
|         | S |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | o |                  |                   |                   |
|         | t |                  |                   |                   |
|         | e |                  |                   |                   |
|         | x |                  |                   |                   |
|         | h |                  |                   |                   |
|         | i |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | g |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | i |                  |                   |                   |
|         | s |                  |                   |                   |
|         | p |                  |                   |                   |
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|         | m |                  |                   |                   |
|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | T |                  | On-line QC was    | The NWQL will     |
|         | h |                  | showing no bias   | make new          |
| >       | i |                  | so the analyst    | calibration and   |
|  QADATA | s |                  | purchased another | check standards   |
| >       | a |                  | standard from a   | from new stock    |
| Summary | n |                  | different source. | solutions.        |
| >       | a |                  | Initial analyses  |                   |
| October | l |                  | show a bias       |                   |
| > 2007  | y |                  | similar to the    |                   |
|         | t |                  | one on the BQS    |                   |
|         | i |                  | charts.           |                   |
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|         | i |                  |                   |                   |
|         | t |                  |                   |                   |
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|         | h |                  |                   |                   |
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|         | s |                  |                   |                   |
|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | A |                  | On-line QC charts | We will monitor   |
|         | l |                  | indicate an equal | the line to see   |
| >       | t |                  | number of points  | if new results    |
|  QADATA | h |                  | above and below   | continue to       |
| >       | o |                  | the MPV at 10 and | improve the       |
| Summary | u |                  | 100 ug/L. At 10   | charts.           |
| >       | g |                  | ug/L there is a   |                   |
|  August | h |                  | difference        |                   |
| > 2007  | t |                  | between the 2     |                   |
|         | h |                  | instruments with  |                   |
|         | e |                  | one trending high |                   |
|         | r |                  | and one trending  |                   |
|         | e |                  | low.              |                   |
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+---------+---+------------------+-------------------+-------------------+
| From    | T |                  |                   | We are making new |
|         | h |                  |                   | standards and we  |
| >       | e |                  |                   | will continue to  |
|  QADATA | p |                  |                   | closely monitor   |
| >       | o |                  |                   | the analysis for  |
| Summary | s |                  |                   | bias.             |
| > June  | i |                  |                   |                   |
| > 2007  | t |                  |                   |                   |
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+---------+---+------------------+-------------------+-------------------+
| From    | T |                  | NWQL QC charts    | We will continue  |
|         | h |                  | indicated a       | to closely        |
| >       | e |                  | similar bias and  | monitor the       |
|  QADATA | d |                  | new calibration   | analysis for      |
| >       | a |                  | standards were    | bias.             |
| Summary | t |                  | prepared in the   |                   |
| > April | a |                  | end of March      |                   |
| > 2007  | d |                  | 2007. We are      |                   |
|         | e |                  | still gathering   |                   |
|         | m |                  | data to see if    |                   |
|         | o |                  | the bias has      |                   |
|         | n |                  | improved.         |                   |
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+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+