##### QADATA Summary -- December 2005

The Inorganic Blind Sample Project (IBSP) of the Branch of Quality
Systems reviews about 100 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 05/01/05
through 12/05/05; however, longer-range charts are used when they add
clarity to the problem. The attached quality-control charts contain data
from samples that have been subject to the same laboratory handling
procedures as the samples submitted by the USGS district offices, and
the data have the same level of quality-control review as the data
released to the districts. Therefore, any factors that affect the data
displayed on the IBSP quality-control charts should also affect the
districts' data in a similar manner. Data from samples known to have
been affected by a problem independent of the laboratory are not
displayed on the charts.

In this report, the "Problem" is determined and written by IBSP and then
sent to the NWQL. The NWQL then gets two weeks to respond to the issue
by writing a "Lab Comment" and a "Corrective Action." Comments from the
lab are incorporated into the QADATA Summary as received. The most
recent comments and responses are in bold followed by comments and
responses from previous QADATA Summaries. Approximately one month after
the QADATA Summary is distributed, the NWQL and IBSP personnel usually
meet to follow-up on corrective actions and their impact on new data.

Current charts (updated twice weekly) may be accessed at
<http://bqs.usgs.gov/bsp/FY05_06charts.htm>. Laboratory and district
personnel can also make their own custom QADATA retrieval to parallel
their objectives 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

Nutrients

[Orthophosphate, Filtered,](#nwql1974) Colorimetry, Labcode 1974,
Parmcode 0671H 4

[Phosphorus, Filtered,](#nwql2331) (Low-level), Colorimetry, Labcode
2331, Parmcode 0666G 4

[Phosphorus, Whole-Water Recoverable,](#nwql2333) (Low-level),
Colorimetry, Labcode 2333, Parmcode 0665G 5

Trace Metals

[Barium, Filtered,](#nwql1786) ICP-MS, Labcode 1786, Parmcode 1005G 6

[Barium, Whole-Water Recoverable,](#nwql2374) ICP-MS, Labcode 2374,
Parmcode 1007D 6

[Boron, Filtered,](#nwql2504) ICP-MS, Labcode 2504, Parmcode 1020G 7

[Cadmium, Filtered,](#nwql1788) ICP-MS, Labcode 1788, Parmcode 1025G 8

[Mercury, Filtered,](#nwql2707) CVAF, Labcode 2707, Parmcode 71890C 8

[Mercury, Whole-Water Recoverable,](#nwql2708) CVAF, Labcode 2708,
Parmcode 71900D 9

[Uranium, Filtered,](#nwql1797) ICP-MS, Labcode 1797, Parmcode 22703G 9

[Zinc, Filtered,](#nwql1798) ICP-MS, Labcode 1798, Parmcode 1090G 9

[Zinc, Whole-Water Recoverable,](#nwql2390) ICP-MS, Labcode 2390,
Parmcode 1092D 10

Majors

[Calcium, Filtered,](#nwql0659) ICP, Labcode 0659, Parmcode 0915D 11

[Fluoride, Filtered,](#nwql0031) ISE, Labcode 0031, Parmcode 0950B 12

[Silica, Filtered,](#nwql0056) Colorimetry, Labcode 0056, Parmcode 0955C
13

[Specific Conductance, Whole-Water Recoverable,](#nwql0069)
Electrometry, Labcode 0069, Parmcode 90095A 14

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

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

1.  [Phosphorus](http://bqs.usgs.gov/bsp/QADATA_all/05DEC/DEC05NWQL00666G.gif),
    filtered, colorimetry, low-level, parmcode 0666G -- Slight positive
    bias (about 5.6%) starting September 2005.

2.  [Phosphorus](http://bqs.usgs.gov/bsp/QADATA_all/05DEC/DEC05NWQL00665G.gif),
    whole-water recoverable, colorimetry, low-level, parmcode 0665G --
    Slight positive bias (about 6.1%) starting mid-July 2005.

3.  [Mercury](http://bqs.usgs.gov/bsp/QADATA_all/05DEC/DEC05NWQL71890C.gif),
    filtered, CVAF, parmcode 71890C -- Positive bias (about 5.5%)
    starting mid-August 2005.

4.  [Mercury](http://bqs.usgs.gov/bsp/QADATA_all/05DEC/DEC05NWQL71900D.gif),
    whole-water recoverable, CVAF, parmcode 71900D -- Positive bias
    (about 8.4%) starting late August.

5.  [Uranium](http://bqs.usgs.gov/bsp/QADATA_all/05DEC/DEC05NWQL22703G.gif),
    filtered, ICP-MS, parmcode 22703G -- Negative bias late August 2005
    through mid-October (about 8.6%).

6.  Zinc,
    [filtered](http://bqs.usgs.gov/bsp/QADATA_all/05DEC/DEC05NWQL01090G.gif)
    and [whole-water
    recoverable](http://bqs.usgs.gov/bsp/QADATA_all/05DEC/DEC05NWQL01092D.gif),
    ICP-MS parmcodes 1090G and 1092D respectively -- Negative bias
    (about 6.5% overall) starting July 2005.

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      |   |                  | **Lab Comment**   | **Action**        |
| termina |   |                  |                   |                   |
| tions** |   |                  |                   |                   |
+=========+===+==================+===================+===================+
| [[]{#n  | * |                  |                   |                   |
| wql1974 | * |                  |                   |                   |
| .anc    | C |                  |                   |                   |
| hor}**O | o |                  |                   |                   |
| rthopho | r |                  |                   |                   |
| sphate, | r |                  |                   |                   |
| Fil     | e |                  |                   |                   |
| tered** | c |                  |                   |                   |
| ](http: | t |                  |                   |                   |
| //bqs.u | i |                  |                   |                   |
| sgs.gov | v |                  |                   |                   |
| /bsp/QA | e |                  |                   |                   |
| DATA_al | a |                  |                   |                   |
| l/05DEC | c |                  |                   |                   |
| /DEC05N | t |                  |                   |                   |
| WQL0067 | i |                  |                   |                   |
| 1H.gif) | o |                  |                   |                   |
| **Colo  | n |                  |                   |                   |
| rimetry | s |                  |                   |                   |
| labcode | t |                  |                   |                   |
| 1974    | a |                  |                   |                   |
| p       | k |                  |                   |                   |
| armcode | e |                  |                   |                   |
| 0671H** | n |                  |                   |                   |
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+---------+---+------------------+-------------------+-------------------+
| *P      |   |                  |                   |                   |
| revious |   |                  |                   |                   |
| c       |   |                  |                   |                   |
| omments |   |                  |                   |                   |
| for     |   |                  |                   |                   |
| o       |   |                  |                   |                   |
| rthopho |   |                  |                   |                   |
| sphate, |   |                  |                   |                   |
| fi      |   |                  |                   |                   |
| ltered, |   |                  |                   |                   |
| color   |   |                  |                   |                   |
| imetry, |   |                  |                   |                   |
| labcode |   |                  |                   |                   |
| 1974,   |   |                  |                   |                   |
| p       |   |                  |                   |                   |
| armcode |   |                  |                   |                   |
| 0671H*  |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | T |                  | New standards     | The NWQL          |
|         | h |                  | have been         | investigation of  |
| >       | e |                  | prepared and      | this bias is      |
|  QADATA | r |                  | concentrations    | ongoing. The      |
| >       | e |                  | verified by two   | investigation     |
| Summary | i |                  | other             | includes research |
| >       | s |                  | instruments;      | into preparation  |
| >       | a |                  | these are now in  | of standards, QC  |
| October | l |                  | use as of         | samples,          |
| > 2005  | a |                  | September 19,     | instrument        |
|         | r |                  | 2005. There has   | cleaning          |
|         | g |                  | been no           | procedures, and   |
|         | e |                  | discernable       | possible sample   |
|         | n |                  | change in the     | interference. New |
|         | e |                  | bias using the    | QC standards have |
|         | g |                  | new standards.    | been ordered and  |
|         | a |                  |                   | will be put       |
|         | t |                  |                   | online by the end |
|         | i |                  |                   | of October. A new |
|         | v |                  |                   | instrument        |
|         | e |                  |                   | cleaning          |
|         | b |                  |                   | procedure will be |
|         | i |                  |                   | implemented this  |
|         | a |                  |                   | week. The         |
|         | s |                  |                   | frequency of QC   |
|         | i |                  |                   | samples has been  |
|         | n |                  |                   | doubled to        |
|         | t |                  |                   | attempt to        |
|         | h |                  |                   | identify possible |
|         | e |                  |                   | cases of sample   |
|         | d |                  |                   | interference.     |
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+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [[]{#n  | * |                  | **New SPEX        | **A new batch of  |
| wql2331 | * |                  | standards were    | acidic molybdate  |
| .anchor | A |                  | put on-line on    | reagent was made  |
| }**Phos | l |                  | 10/27/05. The     | on 12/07/05 to    |
| phorus, | l |                  | system was        | test the          |
| Fil     | r |                  | rebuilt on        | response. If      |
| tered** | e |                  | 10/20/05. A       | necessary, we     |
| ](http: | s |                  | comparison of     | will prepare      |
| //bqs.u | u |                  | calibration       | calibration       |
| sgs.gov | l |                  | standards with    | standards from    |
| /bsp/QA | t |                  | the alkaline      | the same ERA      |
| DATA_al | s |                  | persulfate line   | stock solution    |
| l/05DEC | s |                  | (made from an ERA | used to prepare   |
| /DEC05N | i |                  | stock solution)   | alkaline          |
| WQL0066 | n |                  | indicates that    | persulfate        |
| 6G.gif) | c |                  | the low-level     | phosphorus        |
| **Lo    | e |                  | standards may be  | standards by the  |
| w-level | S |                  | low. However, new | end of            |
| Colo    | e |                  | SRWS samples      | December.**       |
| rimetry | p |                  | prepared on       |                   |
| labcode | t |                  | 11/08/05 show     |                   |
| 2331    | e |                  | values that are   |                   |
| p       | m |                  | very near or      |                   |
| armcode | b |                  | slightly below    |                   |
| 0666G** | e |                  | the MPV using the |                   |
|         | r |                  | existing          |                   |
|         | 2 |                  | calibrants. New   |                   |
|         | 0 |                  | batches of        |                   |
|         | 0 |                  | ammonium          |                   |
|         | 5 |                  | persulfate        |                   |
|         | e |                  | reagent were      |                   |
|         | x |                  | prepared 3 times  |                   |
|         | h |                  | in November. The  |                   |
|         | i |                  | acidic molybdate  |                   |
|         | b |                  | reagent is        |                   |
|         | i |                  | supposed to be    |                   |
|         | t |                  | good for a year   |                   |
|         | a |                  | but will be       |                   |
|         | p |                  | remade and tested |                   |
|         | o |                  | to see if that    |                   |
|         | s |                  | reagent has       |                   |
|         | i |                  | deteriorated.**   |                   |
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+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [[]{#n  |   | **All results    | **New SPEX        | **A new batch of  |
| wql2333 |   | since mid-July   | calibration       | acidic molybdate  |
| .anchor |   | 2005 show a      | standards were    | reagent was made  |
| }**Phos |   | positive bias.   | approved on       | on 12/07/05 to    |
| phorus, |   | Results since    | 11/15/05 and      | test the          |
| Whol    |   | mid-August 2005  | 11/29/05. The     | response. If      |
| e-Water |   | exhibit an       | system was        | necessary, we     |
| Recove  |   | average positive | rebuilt on        | will prepare      |
| rable** |   | bias of 6.1%     | 10/20/05. New     | calibration       |
| ](http: |   | above the target | SRWS standards    | standards from    |
| //bqs.u |   | value.**         | were put on-line  | the same ERA      |
| sgs.gov |   |                  | on 11/17/05 and   | stock solution    |
| /bsp/QA |   | **This bias is   | show values very  | used to prepare   |
| DATA_al |   | not demonstrated | near or slightly  | alkaline          |
| l/05DEC |   | for phosphorus   | below the MPV. A  | persulfate        |
| /DEC05N |   | determinations   | comparison of     | phosphorus        |
| WQL0066 |   | by the regular   | calibration       | standards by the  |
| 5G.gif) |   | level methods.** | standards with    | end of            |
| **Lo    |   |                  | the alkaline      | December.**       |
| w-level |   |                  | persulfate line   |                   |
| Colo    |   |                  | (made from an ERA |                   |
| rimetry |   |                  | stock solution)   |                   |
| labcode |   |                  | indicates that    |                   |
| 2333    |   |                  | the low-level     |                   |
| p       |   |                  | standards may be  |                   |
| armcode |   |                  | low. New batches  |                   |
| 0665G** |   |                  | of ammonium       |                   |
|         |   |                  | persulfate        |                   |
|         |   |                  | reagent were      |                   |
|         |   |                  | prepared 3 times  |                   |
|         |   |                  | in November. The  |                   |
|         |   |                  | acidic molybdate  |                   |
|         |   |                  | reagent is        |                   |
|         |   |                  | supposed to be    |                   |
|         |   |                  | good for a year   |                   |
|         |   |                  | but will be       |                   |
|         |   |                  | remade and tested |                   |
|         |   |                  | to see if that    |                   |
|         |   |                  | reagent has       |                   |
|         |   |                  | deteriorated.**   |                   |
+---------+---+------------------+-------------------+-------------------+
| *P      |   |                  |                   |                   |
| revious |   |                  |                   |                   |
| c       |   |                  |                   |                   |
| omments |   |                  |                   |                   |
| for     |   |                  |                   |                   |
| phos    |   |                  |                   |                   |
| phorus, |   |                  |                   |                   |
| whol    |   |                  |                   |                   |
| e-water |   |                  |                   |                   |
| recov   |   |                  |                   |                   |
| erable, |   |                  |                   |                   |
| low     |   |                  |                   |                   |
| -level, |   |                  |                   |                   |
| color   |   |                  |                   |                   |
| imetry, |   |                  |                   |                   |
| labcode |   |                  |                   |                   |
| 2333,   |   |                  |                   |                   |
| p       |   |                  |                   |                   |
| armcode |   |                  |                   |                   |
| 0665G*  |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | A |                  | The NWQL agrees   | New stock         |
|         | l |                  | with the          | standards have    |
| >       | l |                  | observation.      | been ordered so   |
|  QADATA | r |                  |                   | new working       |
| >       | e |                  |                   | standards can be  |
| Summary | s |                  |                   | prepared and put  |
| >       | u |                  |                   | online by October |
| >       | l |                  |                   | 30, 2005.         |
| October | t |                  |                   |                   |
| > 2005  | s |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | c |                  |                   |                   |
|         | e |                  |                   |                   |
|         | i |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | d |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | c |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | l |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | Q |                  |                   |                   |
|         | A |                  |                   |                   |
|         | D |                  |                   |                   |
|         | A |                  |                   |                   |
|         | T |                  |                   |                   |
|         | A |                  |                   |                   |
|         | S |                  |                   |                   |
|         | u |                  |                   |                   |
|         | m |                  |                   |                   |
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|         | a |                  |                   |                   |
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|         | A |                  |                   |                   |
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|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | C |                  |                   |                   |
|         | o |                  |                   |                   |
| >       | r |                  |                   |                   |
|  QADATA | r |                  |                   |                   |
| >       | e |                  |                   |                   |
| Summary | c |                  |                   |                   |
| >       | t |                  |                   |                   |
| >       | i |                  |                   |                   |
|  August | v |                  |                   |                   |
| > 2005  | e |                  |                   |                   |
|         | a |                  |                   |                   |
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|         | N |                  |                   |                   |
|         | W |                  |                   |                   |
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+---------+---+------------------+-------------------+-------------------+
| From    | A |                  | Working standards | Since the         |
|         | l |                  | prepared and put  | preparation of    |
| >       | l |                  | online April 4th  | new standards,    |
|  QADATA | r |                  | appear to have    | the bias seems to |
| >       | e |                  | been prepared     | have improved. We |
| Summary | s |                  | from a degrading  | will continue to  |
| >       | u |                  | stock. After high | closely monitor   |
| > June  | l |                  | bias was noted by | the line.         |
| > 2005  | t |                  | analyst, a new    |                   |
|         | s |                  | stock standard    |                   |
|         | r |                  | was ordered. New  |                   |
|         | e |                  | working standards |                   |
|         | c |                  | put online on May |                   |
|         | e |                  | 18.               |                   |
|         | i |                  |                   |                   |
|         | v |                  |                   |                   |
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|         | d |                  |                   |                   |
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+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+

+---------+---+------------------+-------------------+-------------------+
| **Trace | * |                  | **NWQL**          | **Corrective**    |
| Metal   | * |                  |                   |                   |
| De      | P |                  | **Comment**       | **Action**        |
| termina | r |                  |                   |                   |
| tions** | o |                  |                   |                   |
|         | b |                  |                   |                   |
|         | l |                  |                   |                   |
|         | e |                  |                   |                   |
|         | m |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+=========+===+==================+===================+===================+
| [[]{#n  | * |                  |                   | **NWQL QC charts  |
| wql1786 | * |                  |                   | also indicate no  |
| .an     | A |                  |                   | current bias.     |
| chor}** | n |                  |                   | Since recent data |
| Barium, | e |                  |                   | show improvement, |
| Fil     | g |                  |                   | the analysis will |
| tered** | a |                  |                   | be closely        |
| ](http: | t |                  |                   | monitored until   |
| //bqs.u | i |                  |                   | the next QADATA   |
| sgs.gov | v |                  |                   | summary.**        |
| /bsp/QA | e |                  |                   |                   |
| DATA_al | b |                  |                   |                   |
| l/05DEC | i |                  |                   |                   |
| /DEC05N | a |                  |                   |                   |
| WQL0100 | s |                  |                   |                   |
| 5G.gif) | i |                  |                   |                   |
| *       | s |                  |                   |                   |
| *ICP-MS | d |                  |                   |                   |
| labcode | e |                  |                   |                   |
| 1786    | m |                  |                   |                   |
| p       | o |                  |                   |                   |
| armcode | n |                  |                   |                   |
| 1005G** | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | r |                  |                   |                   |
|         | a |                  |                   |                   |
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|         | S |                  |                   |                   |
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|         | p |                  |                   |                   |
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|         | m |                  |                   |                   |
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|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [[]{#n  | * |                  | **The digestion   | **Current NWQL QC |
| wql2374 | * |                  | of calibration    | charts also       |
| .an     | T |                  | standards made no | indicate no bias. |
| chor}** | h |                  | significant       | The analysis will |
| Barium, | e |                  | difference in     | be closely        |
| Whol    | f |                  | INBD spike        | monitored until   |
| e-Water | i |                  | recoveries.**     | the next QADATA   |
| Recove  | v |                  |                   | summary.**        |
| rable** | e |                  |                   |                   |
| ](http: | m |                  |                   |                   |
| //bqs.u | o |                  |                   |                   |
| sgs.gov | s |                  |                   |                   |
| /bsp/QA | t |                  |                   |                   |
| DATA_al | r |                  |                   |                   |
| l/05DEC | e |                  |                   |                   |
| /DEC05N | c |                  |                   |                   |
| WQL0100 | e |                  |                   |                   |
| 7D.gif) | n |                  |                   |                   |
| *       | t |                  |                   |                   |
| *ICP-MS | r |                  |                   |                   |
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|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| *P      |   |                  |                   |                   |
| revious |   |                  |                   |                   |
| c       |   |                  |                   |                   |
| omments |   |                  |                   |                   |
| for     |   |                  |                   |                   |
| barium, |   |                  |                   |                   |
| whol    |   |                  |                   |                   |
| e-water |   |                  |                   |                   |
| recov   |   |                  |                   |                   |
| erable, |   |                  |                   |                   |
| ICP-MS, |   |                  |                   |                   |
| labcode |   |                  |                   |                   |
| 2374,   |   |                  |                   |                   |
| p       |   |                  |                   |                   |
| armcode |   |                  |                   |                   |
| 1007D*  |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | T |                  | The analyst noted | Analyst is        |
|         | h |                  | low bias around   | digesting         |
| >       | e |                  | mid-July,         | calibration       |
|  QADATA | p |                  | however, NWQL QC  | standards to      |
| >       | r |                  | charts indicate   | determine if they |
| Summary | e |                  | the bias is       | are causing a     |
| >       | v |                  | improving.        | negative bias.    |
| October | i |                  | Current           |                   |
| > 2005  | o |                  | calibration       | []{.mark}         |
|         | u |                  | standards were    |                   |
|         | s |                  | prepared on       |                   |
|         | l |                  | August 24^th^,    |                   |
|         | y |                  | 2005. The INBD    |                   |
|         | n |                  | spike QC chart    |                   |
|         | o |                  | indicates a -6.4% |                   |
|         | t |                  | bias since        |                   |
|         | e |                  | mid-July.         |                   |
|         | d |                  | Calibration       |                   |
|         | n |                  | standards were    |                   |
|         | e |                  | compared to NIST  |                   |
|         | g |                  | traceable         |                   |
|         | a |                  | standards on the  |                   |
|         | t |                  | ICP and values    |                   |
|         | i |                  | were within 2%.   |                   |
|         | v |                  | The analyst has   |                   |
|         | e |                  | put the           |                   |
|         | b |                  | calibration       |                   |
|         | i |                  | standards through |                   |
|         | a |                  | the INBD process  |                   |
|         | s |                  | and is            |                   |
|         | h |                  | determining       |                   |
|         | a |                  | whether or not    |                   |
|         | s |                  | digesting the     |                   |
|         | s |                  | standards can     |                   |
|         | h |                  | affect the bias.  |                   |
|         | i |                  | It will take a    |                   |
|         | f |                  | few weeks to make |                   |
|         | t |                  | a conclusive      |                   |
|         | e |                  | decision.         |                   |
|         | d |                  | []{.mark}         |                   |
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+---------+---+------------------+-------------------+-------------------+
| From    | R |                  |                   |                   |
|         | e |                  |                   |                   |
| >       | s |                  |                   |                   |
|  QADATA | u |                  |                   |                   |
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|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [[]{#n  | * |                  |                   | **Current NWQL QC |
| wql2504 | * |                  |                   | charts also       |
| .a      | R |                  |                   | indicate that     |
| nchor}* | e |                  |                   | variability has   |
| *Boron, | s |                  |                   | improved.**       |
| Fil     | u |                  |                   |                   |
| tered** | l |                  |                   |                   |
| ](http: | t |                  |                   |                   |
| //bqs.u | s |                  |                   |                   |
| sgs.gov | r |                  |                   |                   |
| /bsp/QA | e |                  |                   |                   |
| DATA_al | c |                  |                   |                   |
| l/05DEC | e |                  |                   |                   |
| /DEC05N | i |                  |                   |                   |
| WQL0102 | v |                  |                   |                   |
| 0G.gif) | e |                  |                   |                   |
| **\     | d |                  |                   |                   |
| ICP-MS  | f |                  |                   |                   |
| labcode | o |                  |                   |                   |
| 2504    | r |                  |                   |                   |
| p       | s |                  |                   |                   |
| armcode | a |                  |                   |                   |
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+---------+---+------------------+-------------------+-------------------+
| *P      |   |                  |                   |                   |
| revious |   |                  |                   |                   |
| c       |   |                  |                   |                   |
| omments |   |                  |                   |                   |
| for     |   |                  |                   |                   |
| boron,  |   |                  |                   |                   |
| fi      |   |                  |                   |                   |
| ltered, |   |                  |                   |                   |
| ICP-MS, |   |                  |                   |                   |
| labcode |   |                  |                   |                   |
| 2504,   |   |                  |                   |                   |
| p       |   |                  |                   |                   |
| armcode |   |                  |                   |                   |
| 1020G*  |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | T |                  | The analyst noted | The ICP-MS        |
|         | h |                  | an increase in    | instrument method |
| >       | e |                  | variability on    | was modified on   |
|  QADATA | v |                  | NWQL QC charts in | October 3^rd^,    |
| >       | a |                  | September 2005    | 2005, to increase |
| Summary | r |                  | (≈9% RSD). The    | rinse times when  |
| >       | i |                  | charts include    | the boron         |
| October | a |                  | values both above | concentration is  |
| > 2005  | b |                  | and below the     | greater than 100  |
|         | i |                  | control limits.   | µg/L in           |
|         | l |                  | It was determined | environmental     |
|         | i |                  | that the high     | samples. We will  |
|         | t |                  | values were       | closely monitor   |
|         | y |                  | probably due to   | the boron         |
|         | h |                  | boron carry-over. | carry-over to     |
|         | a |                  | The low values    | evaluate if the   |
|         | s |                  | could be due to a | increased         |
|         | b |                  | bias caused by    | rinse-time is     |
|         | e |                  | the calibration   | sufficient as     |
|         | e |                  | standards. New    | well as           |
|         | n |                  | calibration       | continuing to     |
|         | i |                  | standards were    | monitor boron for |
|         | n |                  | prepared in       | bias.             |
|         | c |                  | mid-September.    |                   |
|         | r |                  | There have not    |                   |
|         | e |                  | been enough data  |                   |
|         | a |                  | points on NWQL QC |                   |
|         | s |                  | charts to         |                   |
|         | i |                  | determine if the  |                   |
|         | n |                  | new calibration   |                   |
|         | g |                  | standards have    |                   |
|         | o |                  | helped with the   |                   |
|         | v |                  | low bias.         |                   |
|         | e |                  |                   |                   |
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+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [[]{#n  | * |                  |                   | **Current NWQL QC |
| wql1788 | * |                  |                   | charts also       |
| .anc    | C |                  |                   | indicate no bias. |
| hor}**C | o |                  |                   | The analysis will |
| admium, | r |                  |                   | be closely        |
| Fil     | r |                  |                   | monitored until   |
| tered** | e |                  |                   | the next QADATA   |
| ](http: | c |                  |                   | summary.**        |
| //bqs.u | t |                  |                   |                   |
| sgs.gov | i |                  |                   |                   |
| /bsp/QA | v |                  |                   |                   |
| DATA_al | e |                  |                   |                   |
| l/05DEC | a |                  |                   |                   |
| /DEC05N | c |                  |                   |                   |
| WQL0102 | t |                  |                   |                   |
| 5G.gif) | i |                  |                   |                   |
| *       | o |                  |                   |                   |
| *ICP-MS | n |                  |                   |                   |
| labcode | s |                  |                   |                   |
| 1788    | t |                  |                   |                   |
| p       | a |                  |                   |                   |
| armcode | k |                  |                   |                   |
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|         | d |                  |                   |                   |
|         | - |                  |                   |                   |
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|         | 2 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 5 |                  |                   |                   |
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|         | l |                  |                   |                   |
|         | o |                  |                   |                   |
|         | s |                  |                   |                   |
|         | e |                  |                   |                   |
|         | l |                  |                   |                   |
|         | y |                  |                   |                   |
|         | m |                  |                   |                   |
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|         | n |                  |                   |                   |
|         | i |                  |                   |                   |
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|         | d |                  |                   |                   |
|         | u |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | l |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | e |                  |                   |                   |
|         | x |                  |                   |                   |
|         | t |                  |                   |                   |
|         | Q |                  |                   |                   |
|         | A |                  |                   |                   |
|         | D |                  |                   |                   |
|         | A |                  |                   |                   |
|         | T |                  |                   |                   |
|         | A |                  |                   |                   |
|         | S |                  |                   |                   |
|         | u |                  |                   |                   |
|         | m |                  |                   |                   |
|         | m |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | y |                  |                   |                   |
|         | i |                  |                   |                   |
|         | s |                  |                   |                   |
|         | d |                  |                   |                   |
|         | i |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | r |                  |                   |                   |
|         | i |                  |                   |                   |
|         | b |                  |                   |                   |
|         | u |                  |                   |                   |
|         | t |                  |                   |                   |
|         | e |                  |                   |                   |
|         | d |                  |                   |                   |
|         | . |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| *P      |   |                  |                   |                   |
| revious |   |                  |                   |                   |
| c       |   |                  |                   |                   |
| omments |   |                  |                   |                   |
| for     |   |                  |                   |                   |
| c       |   |                  |                   |                   |
| admium, |   |                  |                   |                   |
| fi      |   |                  |                   |                   |
| ltered, |   |                  |                   |                   |
| ICP-MS, |   |                  |                   |                   |
| labcode |   |                  |                   |                   |
| 1788,   |   |                  |                   |                   |
| p       |   |                  |                   |                   |
| armcode |   |                  |                   |                   |
| 1025G*  |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | A |                  | The analyst noted | We will continue  |
|         | p |                  | a positive bias   | to monitor the    |
| >       | o |                  | on the NWQL QC    | cadmium line for  |
|  QADATA | s |                  | charts in         | bias.             |
| >       | i |                  | September 2005    |                   |
| Summary | t |                  | (≈3%). New        |                   |
| >       | i |                  | calibration       |                   |
| October | v |                  | standards were    |                   |
| > 2005  | e |                  | prepared in       |                   |
|         | b |                  | mid-September.    |                   |
|         | i |                  | Current NWQL QC   |                   |
|         | a |                  | charts indicate   |                   |
|         | s |                  | the positive bias |                   |
|         | i |                  | has been          |                   |
|         | s |                  | corrected.        |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | l |                  |                   |                   |
|         | l |                  |                   |                   |
|         | p |                  |                   |                   |
|         | r |                  |                   |                   |
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|         | s |                  |                   |                   |
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|         | n |                  |                   |                   |
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|         | h |                  |                   |                   |
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|         | a |                  |                   |                   |
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|         | d |                  |                   |                   |
|         | . |                  |                   |                   |
|         | R |                  |                   |                   |
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|         | s |                  |                   |                   |
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|         | l |                  |                   |                   |
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|         | C |                  |                   |                   |
|         | P |                  |                   |                   |
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|         | 0 |                  |                   |                   |
|         | 6 |                  |                   |                   |
|         | 7 |                  |                   |                   |
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|         | ) |                  |                   |                   |
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|         | h |                  |                   |                   |
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|         | - |                  |                   |                   |
|         | w |                  |                   |                   |
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|         | o |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | a |                  |                   |                   |
|         | b |                  |                   |                   |
|         | l |                  |                   |                   |
|         | e |                  |                   |                   |
|         | c |                  |                   |                   |
|         | a |                  |                   |                   |
|         | d |                  |                   |                   |
|         | m |                  |                   |                   |
|         | i |                  |                   |                   |
|         | u |                  |                   |                   |
|         | m |                  |                   |                   |
|         | b |                  |                   |                   |
|         | y |                  |                   |                   |
|         | I |                  |                   |                   |
|         | C |                  |                   |                   |
|         | P |                  |                   |                   |
|         | - |                  |                   |                   |
|         | M |                  |                   |                   |
|         | S |                  |                   |                   |
|         | l |                  |                   |                   |
|         | a |                  |                   |                   |
|         | b |                  |                   |                   |
|         | c |                  |                   |                   |
|         | o |                  |                   |                   |
|         | d |                  |                   |                   |
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|         | 2 |                  |                   |                   |
|         | 3 |                  |                   |                   |
|         | 7 |                  |                   |                   |
|         | 6 |                  |                   |                   |
|         | ) |                  |                   |                   |
|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | R |                  |                   |                   |
|         | e |                  |                   |                   |
| >       | s |                  |                   |                   |
|  QADATA | u |                  |                   |                   |
| >       | l |                  |                   |                   |
| Summary | t |                  |                   |                   |
| >       | s |                  |                   |                   |
|  August | f |                  |                   |                   |
| > 2005  | r |                  |                   |                   |
|         | o |                  |                   |                   |
|         | m |                  |                   |                   |
|         | s |                  |                   |                   |
|         | a |                  |                   |                   |
|         | m |                  |                   |                   |
|         | p |                  |                   |                   |
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|         | a |                  |                   |                   |
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|         | y |                  |                   |                   |
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|         | d |                  |                   |                   |
|         | J |                  |                   |                   |
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|         | n |                  |                   |                   |
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|         | 2 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 5 |                  |                   |                   |
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|         | A |                  |                   |                   |
|         | n |                  |                   |                   |
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|         | l |                  |                   |                   |
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|         | s |                  |                   |                   |
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|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | h |                  |                   |                   |
|         | o |                  |                   |                   |
|         | u |                  |                   |                   |
|         | l |                  |                   |                   |
|         | d |                  |                   |                   |
|         | b |                  |                   |                   |
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|         | c |                  |                   |                   |
|         | l |                  |                   |                   |
|         | o |                  |                   |                   |
|         | s |                  |                   |                   |
|         | e |                  |                   |                   |
|         | l |                  |                   |                   |
|         | y |                  |                   |                   |
|         | m |                  |                   |                   |
|         | o |                  |                   |                   |
|         | n |                  |                   |                   |
|         | i |                  |                   |                   |
|         | t |                  |                   |                   |
|         | o |                  |                   |                   |
|         | r |                  |                   |                   |
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|         | d |                  |                   |                   |
|         | u |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | l |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | e |                  |                   |                   |
|         | x |                  |                   |                   |
|         | t |                  |                   |                   |
|         | Q |                  |                   |                   |
|         | A |                  |                   |                   |
|         | D |                  |                   |                   |
|         | A |                  |                   |                   |
|         | T |                  |                   |                   |
|         | A |                  |                   |                   |
|         | S |                  |                   |                   |
|         | u |                  |                   |                   |
|         | m |                  |                   |                   |
|         | m |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | y |                  |                   |                   |
|         | i |                  |                   |                   |
|         | s |                  |                   |                   |
|         | d |                  |                   |                   |
|         | i |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | r |                  |                   |                   |
|         | i |                  |                   |                   |
|         | b |                  |                   |                   |
|         | u |                  |                   |                   |
|         | t |                  |                   |                   |
|         | e |                  |                   |                   |
|         | d |                  |                   |                   |
|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | D |                  | Online QC charts  | We have no        |
|         | a |                  | do not indicate a | explanation for   |
| >       | t |                  | bias. The         | the bias observed |
|  QADATA | a |                  | calibration       | in the BQS        |
| >       | i |                  | standards were    | charts. We will   |
| Summary | n |                  | run by ICP with a | work with BQS to  |
| > June  | d |                  | percent           | identify the      |
| > 2005  | i |                  | difference of 2%  | cause of the      |
|         | c |                  | or less. SRS T145 | bias.             |
|         | a |                  | was run with a    |                   |
|         | t |                  | result of 9.8ug/L |                   |
|         | e |                  | (limits are 8.51  |                   |
|         | a |                  | -- 10.15 ug/L). A |                   |
|         | p |                  | NIST standard was |                   |
|         | o |                  | run with a value  |                   |
|         | s |                  | of 20.18 ug/L     |                   |
|         | i |                  | (Theoretical      |                   |
|         | t |                  | value= 20 ug/L).  |                   |
|         | i |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | . |                  |                   |                   |
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+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [[]{#n  | * |                  | **Positive bias   | **We will         |
| wql2707 | * |                  | was noted on NWQL | continue to       |
| .anc    | D |                  | QC and BQS charts | monitor the       |
| hor}**M | a |                  | in November. New  | mercury line for  |
| ercury, | t |                  | calibrations      | bias. If the new  |
| Fil     | a |                  | standards were    | standards have    |
| tered** | i |                  | prepared on       | not fixed the     |
| ](http: | n |                  | November 28^th^,  | bias we will look |
| //bqs.u | d |                  | 2005. Most recent | for other         |
| sgs.gov | i |                  | data indicate     | causes.**         |
| /bsp/QA | c |                  | bias is           |                   |
| DATA_al | a |                  | improved.**       |                   |
| l/05DEC | t |                  |                   |                   |
| /DEC05N | e |                  |                   |                   |
| WQL7189 | a |                  |                   |                   |
| 0C.gif) | p |                  |                   |                   |
| *       | o |                  |                   |                   |
| *CVAF** | s |                  |                   |                   |
| **      | i |                  |                   |                   |
| labcode | t |                  |                   |                   |
| 2707    | i |                  |                   |                   |
| p       | v |                  |                   |                   |
| armcode | e |                  |                   |                   |
| 7       | b |                  |                   |                   |
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+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [[]{#n  | * |                  | **Positive bias   | **We will         |
| wql2708 | * |                  | was noted on NWQL | continue to       |
| .anc    | D |                  | QC and BQS charts | monitor the       |
| hor}**M | a |                  | in November. New  | mercury line for  |
| ercury, | t |                  | calibrations      | bias. If the new  |
| Whole   | a |                  | standards were    | standards have    |
| Water   | e |                  | prepared on       | not fixed the     |
| Recove  | x |                  | November 28^th^,  | bias we will look |
| rable** | h |                  | 2005. Most recent | for other         |
| ](http: | i |                  | data indicate     | causes.**         |
| //bqs.u | b |                  | bias is           |                   |
| sgs.gov | i |                  | improved.**       |                   |
| /bsp/QA | t |                  |                   |                   |
| DATA_al | a |                  |                   |                   |
| l/05DEC | p |                  |                   |                   |
| /DEC05N | o |                  |                   |                   |
| WQL7190 | s |                  |                   |                   |
| 0D.gif) | i |                  |                   |                   |
| *       | t |                  |                   |                   |
| *CVAF** | i |                  |                   |                   |
| **      | v |                  |                   |                   |
| labcode | e |                  |                   |                   |
| 2708    | b |                  |                   |                   |
| p       | i |                  |                   |                   |
| armcode | a |                  |                   |                   |
| 7       | s |                  |                   |                   |
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+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [[]{#n  | * |                  |                   | **Current NWQL QC |
| wql1797 | * |                  |                   | charts also       |
| .anc    | R |                  |                   | indicate no bias. |
| hor}**U | e |                  |                   | The analysis will |
| ranium, | s |                  |                   | be closely        |
| Fil     | u |                  |                   | monitored until   |
| tered** | l |                  |                   | the next QADATA   |
| ](http: | t |                  |                   | summary.**        |
| //bqs.u | s |                  |                   |                   |
| sgs.gov | f |                  |                   |                   |
| /bsp/QA | o |                  |                   |                   |
| DATA_al | r |                  |                   |                   |
| l/05DEC | s |                  |                   |                   |
| /DEC05N | a |                  |                   |                   |
| WQL2270 | m |                  |                   |                   |
| 3G.gif) | p |                  |                   |                   |
| *       | l |                  |                   |                   |
| *ICP-MS | e |                  |                   |                   |
| labcode | s |                  |                   |                   |
| 1797    | a |                  |                   |                   |
| p       | n |                  |                   |                   |
| armcode | a |                  |                   |                   |
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+---------+---+------------------+-------------------+-------------------+
| *P      |   |                  |                   |                   |
| revious |   |                  |                   |                   |
| c       |   |                  |                   |                   |
| omments |   |                  |                   |                   |
| for     |   |                  |                   |                   |
| u       |   |                  |                   |                   |
| ranium, |   |                  |                   |                   |
| fi      |   |                  |                   |                   |
| ltered, |   |                  |                   |                   |
| ICP-MS, |   |                  |                   |                   |
| labcode |   |                  |                   |                   |
| 1797,   |   |                  |                   |                   |
| p       |   |                  |                   |                   |
| armcode |   |                  |                   |                   |
| 22703G* |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | A |                  | The analyst noted | We will continue  |
|         | n |                  | a negative bias   | to monitor the    |
| >       | e |                  | on the NWQL QC    | uranium line for  |
|  QADATA | g |                  | charts in         | bias.             |
| >       | a |                  | September 2005    |                   |
| Summary | t |                  | (≈-6%). New       |                   |
| >       | i |                  | calibration       |                   |
| October | v |                  | standards were    |                   |
| > 2005  | e |                  | prepared in       |                   |
|         | b |                  | mid-September.    |                   |
|         | i |                  | Current NWQL QC   |                   |
|         | a |                  | charts indicate   |                   |
|         | s |                  | the negative bias |                   |
|         | i |                  | has been          |                   |
|         | s |                  | corrected.        |                   |
|         | d |                  |                   |                   |
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|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [[]{#n  | * |                  | **The value for   | **We will         |
| wql1798 | * |                  | zinc in the       | continue to       |
| .       | D |                  | vendor stock      | monitor the zinc  |
| anchor} | a |                  | solution has been | line for bias. If |
| **Zinc, | t |                  | determined to be  | the new standards |
| Fil     | a |                  | 7% higher than    | have not fixed    |
| tered** | s |                  | indicated on the  | the bias we will  |
| ](http: | t |                  | certificate of    | look for other    |
| //bqs.u | i |                  | analysis. New     | causes.**         |
| sgs.gov | l |                  | calibration       |                   |
| /bsp/QA | l |                  | standards will be |                   |
| DATA_al | e |                  | prepared using a  |                   |
| l/05DEC | x |                  | new stock         |                   |
| /DEC05N | h |                  | solution and      |                   |
| WQL0109 | i |                  | verified by the   |                   |
| 0G.gif) | b |                  | end of December,  |                   |
| *       | i |                  | 2005. All data    |                   |
| *ICP-MS | t |                  | analyzed since    |                   |
| labcode | a |                  | the use of this   |                   |
| 1798    | n |                  | stock have been   |                   |
| p       | e |                  | within control.   |                   |
| armcode | g |                  | No corrective     |                   |
| 1090G** | a |                  | action is         |                   |
|         | t |                  | necessary on past |                   |
|         | i |                  | data.**           |                   |
|         | v |                  |                   |                   |
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|         | P |                  |                   |                   |
|         | . |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| *P      |   |                  |                   |                   |
| revious |   |                  |                   |                   |
| c       |   |                  |                   |                   |
| omments |   |                  |                   |                   |
| for     |   |                  |                   |                   |
| zinc,   |   |                  |                   |                   |
| fi      |   |                  |                   |                   |
| ltered, |   |                  |                   |                   |
| ICP-MS, |   |                  |                   |                   |
| labcode |   |                  |                   |                   |
| 1798,   |   |                  |                   |                   |
| p       |   |                  |                   |                   |
| armcode |   |                  |                   |                   |
| 1090G*  |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | D |                  | The analyst noted | We will remake    |
|         | a |                  | a negative bias   | the calibration   |
| >       | t |                  | on the NWQL QC    | standards and     |
|  QADATA | a |                  | charts in         | continue to       |
| >       | s |                  | September 2005    | monitor zinc for  |
| Summary | i |                  | (≈-8%). New       | bias.             |
| >       | n |                  | calibration       |                   |
| October | c |                  | standards were    |                   |
| > 2005  | e |                  | prepared in       |                   |
|         | J |                  | mid-September.    |                   |
|         | u |                  | Current NWQL QC   |                   |
|         | l |                  | charts indicate   |                   |
|         | y |                  | the negative bias |                   |
|         | 2 |                  | has improved, but |                   |
|         | 0 |                  | is still evident. |                   |
|         | 0 |                  |                   |                   |
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|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [[]{#n  | * |                  | **The value for   | **We will         |
| wql2390 | * |                  | zinc in the       | continue to       |
| .       | D |                  | vendor stock      | monitor the zinc  |
| anchor} | a |                  | solution has been | line for bias. If |
| **Zinc, | t |                  | determined to be  | the new standards |
| Whol    | a |                  | 7% higher than    | have not fixed    |
| e-Water | s |                  | indicated on the  | the bias we will  |
| Recove  | t |                  | certificate of    | look for other    |
| rable** | i |                  | analysis. New     | causes.**         |
| ](http: | l |                  | calibration       |                   |
| //bqs.u | l |                  | standards will be |                   |
| sgs.gov | e |                  | prepared using a  |                   |
| /bsp/QA | x |                  | new stock         |                   |
| DATA_al | h |                  | solution and      |                   |
| l/05DEC | i |                  | verified by the   |                   |
| /DEC05N | b |                  | end of December,  |                   |
| WQL0109 | i |                  | 2005. All data    |                   |
| 2D.gif) | t |                  | analyzed since    |                   |
| *       | a |                  | the use of this   |                   |
| *ICP-MS | n |                  | stock have been   |                   |
| labcode | e |                  | within control.   |                   |
| 2390    | g |                  | No corrective     |                   |
| p       | a |                  | action is         |                   |
| armcode | t |                  | necessary on past |                   |
| 1092D** | i |                  | data.**           |                   |
|         | v |                  |                   |                   |
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|         | . |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| *P      |   |                  |                   |                   |
| revious |   |                  |                   |                   |
| c       |   |                  |                   |                   |
| omments |   |                  |                   |                   |
| for     |   |                  |                   |                   |
| zinc,   |   |                  |                   |                   |
| whol    |   |                  |                   |                   |
| e-water |   |                  |                   |                   |
| recov   |   |                  |                   |                   |
| erable, |   |                  |                   |                   |
| ICP-MS, |   |                  |                   |                   |
| labcode |   |                  |                   |                   |
| 2390,   |   |                  |                   |                   |
| p       |   |                  |                   |                   |
| armcode |   |                  |                   |                   |
| 1092D*  |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | D |                  | The analyst noted | Standards do not  |
|         | a |                  | a low bias around | appear to be the  |
| >       | t |                  | mid-July. NWQL QC | cause of the low  |
|  QADATA | a |                  | charts indicate   | bias observed on  |
| >       | s |                  | the bias is       | the BQS chart. We |
| Summary | i |                  | improving.        | will continue to  |
| >       | n |                  | Current           | monitor for bias  |
| October | c |                  | calibration       | and look for      |
| > 2005  | e |                  | standards were    | other causes.     |
|         | J |                  | prepared on       |                   |
|         | u |                  | August 24, 2005.  |                   |
|         | l |                  | The calibration   |                   |
|         | y |                  | standards were    |                   |
|         | 2 |                  | compared to NIST  |                   |
|         | 0 |                  | traceable         |                   |
|         | 0 |                  | standards on the  |                   |
|         | 5 |                  | ICP and values    |                   |
|         | a |                  | were within 2%.   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
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|         | b |                  |                   |                   |
|         | y |                  |                   |                   |
|         | a |                  |                   |                   |
|         | b |                  |                   |                   |
|         | o |                  |                   |                   |
|         | u |                  |                   |                   |
|         | t |                  |                   |                   |
|         | 7 |                  |                   |                   |
|         | . |                  |                   |                   |
|         | 5 |                  |                   |                   |
|         | % |                  |                   |                   |
|         | b |                  |                   |                   |
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|         |   |                  |                   |                   |
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|         | d |                  |                   |                   |
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|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | a |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | o |                  |                   |                   |
|         | n |                  |                   |                   |
|         | s |                  |                   |                   |
|         | b |                  |                   |                   |
|         | y |                  |                   |                   |
|         | I |                  |                   |                   |
|         | C |                  |                   |                   |
|         | P |                  |                   |                   |
|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | T |                  |                   |                   |
|         | h |                  |                   |                   |
| >       | e |                  |                   |                   |
|  QADATA | p |                  |                   |                   |
| >       | r |                  |                   |                   |
| Summary | e |                  |                   |                   |
| > June  | v |                  |                   |                   |
| > 2005  | i |                  |                   |                   |
|         | o |                  |                   |                   |
|         | u |                  |                   |                   |
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|         | i |                  |                   |                   |
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|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
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|         | o |                  |                   |                   |
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|         | m |                  |                   |                   |
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|         | d |                  |                   |                   |
|         | - |                  |                   |                   |
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|         | 0 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 5 |                  |                   |                   |
|         | . |                  |                   |                   |
|         |   |                  |                   |                   |
|         | A |                  |                   |                   |
|         | n |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
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|         | l |                  |                   |                   |
|         | o |                  |                   |                   |
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|         | e |                  |                   |                   |
|         | l |                  |                   |                   |
|         | y |                  |                   |                   |
|         | m |                  |                   |                   |
|         | o |                  |                   |                   |
|         | n |                  |                   |                   |
|         | i |                  |                   |                   |
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|         | o |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | d |                  |                   |                   |
|         | u |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | l |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | e |                  |                   |                   |
|         | x |                  |                   |                   |
|         | t |                  |                   |                   |
|         | Q |                  |                   |                   |
|         | A |                  |                   |                   |
|         | D |                  |                   |                   |
|         | A |                  |                   |                   |
|         | T |                  |                   |                   |
|         | A |                  |                   |                   |
|         | S |                  |                   |                   |
|         | u |                  |                   |                   |
|         | m |                  |                   |                   |
|         | m |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | y |                  |                   |                   |
|         | i |                  |                   |                   |
|         | s |                  |                   |                   |
|         | d |                  |                   |                   |
|         | i |                  |                   |                   |
|         | s |                  |                   |                   |
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|         | b |                  |                   |                   |
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|         | d |                  |                   |                   |
|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | D |                  | One internal      | We have no        |
|         | a |                  | chart shows a -4% | explanation for   |
| >       | t |                  | bias for December | the low bias      |
|  QADATA | a |                  | 2004 only and no  | observed in the   |
| >       | s |                  | bias is observed  | BQS charts. We    |
| Summary | i |                  | on all charts for | will continue to  |
| > April | n |                  | the remaining     | monitor for the   |
| > 2005  | c |                  | time period.      | low bias and      |
|         | e |                  |                   | review with BQS   |
|         | D |                  |                   | in one month.     |
|         | e |                  |                   |                   |
|         | c |                  |                   |                   |
|         | e |                  |                   |                   |
|         | m |                  |                   |                   |
|         | b |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | 2 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 4 |                  |                   |                   |
|         | a |                  |                   |                   |
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|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
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|         | 6 |                  |                   |                   |
|         | . |                  |                   |                   |
|         | 3 |                  |                   |                   |
|         | % |                  |                   |                   |
|         | . |                  |                   |                   |
|         | A |                  |                   |                   |
|         | l |                  |                   |                   |
|         | l |                  |                   |                   |
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|         | n |                  |                   |                   |
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|         | s |                  |                   |                   |
|         | ) |                  |                   |                   |
|         | a |                  |                   |                   |
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|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | v |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | u |                  |                   |                   |
|         | e |                  |                   |                   |
|         | . |                  |                   |                   |
|         |   |                  |                   |                   |
|         | T |                  |                   |                   |
|         | h |                  |                   |                   |
|         | i |                  |                   |                   |
|         | s |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
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|         | n |                  |                   |                   |
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|         | r |                  |                   |                   |
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|         | d |                  |                   |                   |
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|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | c |                  |                   |                   |
|         | b |                  |                   |                   |
|         | y |                  |                   |                   |
|         | I |                  |                   |                   |
|         | C |                  |                   |                   |
|         | P |                  |                   |                   |
|         | ‑ |                  |                   |                   |
|         | M |                  |                   |                   |
|         | S |                  |                   |                   |
|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+

+---------+---+------------------+-------------------+-------------------+
| **Major | * |                  | **NWQL**          | **Corrective**    |
| De      | * |                  |                   |                   |
| termina | P |                  | **Comment**       | **Action**        |
| tions** | r |                  |                   |                   |
|         | o |                  |                   |                   |
|         | b |                  |                   |                   |
|         | l |                  |                   |                   |
|         | e |                  |                   |                   |
|         | m |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+=========+===+==================+===================+===================+
| [[]{#n  | * |                  |                   | **Current NWQL QC |
| wql0659 | * |                  |                   | charts indicate   |
| .anc    | T |                  |                   | no significant    |
| hor}**C | h |                  |                   | bias or           |
| alcium, | e |                  |                   | variability. The  |
| Fil     | b |                  |                   | analysis will be  |
| tered** | i |                  |                   | closely monitored |
| ](http: | a |                  |                   | until the next    |
| //bqs.u | s |                  |                   | QADATA summary.** |
| sgs.gov | h |                  |                   |                   |
| /bsp/QA | a |                  |                   |                   |
| DATA_al | s |                  |                   |                   |
| l/05DEC | i |                  |                   |                   |
| /DEC05N | m |                  |                   |                   |
| WQL0091 | p |                  |                   |                   |
| 5D.gif) | r |                  |                   |                   |
| **\     | o |                  |                   |                   |
| ICP     | v |                  |                   |                   |
| labcode | e |                  |                   |                   |
| 0659    | d |                  |                   |                   |
| p       | s |                  |                   |                   |
| armcode | i |                  |                   |                   |
| 0       | n |                  |                   |                   |
| 0915D** | c |                  |                   |                   |
|         | e |                  |                   |                   |
|         | m |                  |                   |                   |
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|         | 0 |                  |                   |                   |
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|         | n |                  |                   |                   |
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|         | x |                  |                   |                   |
|         | t |                  |                   |                   |
|         | Q |                  |                   |                   |
|         | A |                  |                   |                   |
|         | D |                  |                   |                   |
|         | A |                  |                   |                   |
|         | T |                  |                   |                   |
|         | A |                  |                   |                   |
|         | S |                  |                   |                   |
|         | u |                  |                   |                   |
|         | m |                  |                   |                   |
|         | m |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | y |                  |                   |                   |
|         | i |                  |                   |                   |
|         | s |                  |                   |                   |
|         | d |                  |                   |                   |
|         | i |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | r |                  |                   |                   |
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|         | b |                  |                   |                   |
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|         | d |                  |                   |                   |
|         | . |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| *P      |   |                  |                   |                   |
| revious |   |                  |                   |                   |
| c       |   |                  |                   |                   |
| omments |   |                  |                   |                   |
| for     |   |                  |                   |                   |
| c       |   |                  |                   |                   |
| alcium, |   |                  |                   |                   |
| fi      |   |                  |                   |                   |
| ltered, |   |                  |                   |                   |
| ICP,    |   |                  |                   |                   |
| labcode |   |                  |                   |                   |
| 0659,   |   |                  |                   |                   |
| p       |   |                  |                   |                   |
| armcode |   |                  |                   |                   |
| 0915D*  |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | T |                  | The ICP           | We will continue  |
|         | h |                  | instruments were  | to monitor        |
| >       | e |                  | moved to a new    | calcium for bias  |
|  QADATA | d |                  | location at the   | and evaluate the  |
| >       | a |                  | end of June. The  | success of the    |
| Summary | t |                  | instrument        | new calibration   |
| >       | a |                  | immediately       | standards.        |
| October | s |                  | suffered from an  |                   |
| > 2005  | h |                  | instability       |                   |
|         | o |                  | caused by erratic |                   |
|         | w |                  | argon gas supply. |                   |
|         | a |                  | This problem      |                   |
|         | n |                  | reduced the       |                   |
|         | u |                  | instruments'      |                   |
|         | p |                  | productivity by   |                   |
|         | w |                  | almost 50%.       |                   |
|         | a |                  | However, all      |                   |
|         | r |                  | environmental     |                   |
|         | d |                  | samples that      |                   |
|         | s |                  | failed QC were    |                   |
|         | h |                  | rerun. This       |                   |
|         | i |                  | instability       |                   |
|         | f |                  | continued until   |                   |
|         | t |                  | September 13^th^. |                   |
|         | o |                  | The increased     |                   |
|         | f |                  | scatter and high  |                   |
|         | a |                  | bias was noted by |                   |
|         | b |                  | the analyst       |                   |
|         | o |                  | during that time, |                   |
|         | u |                  | but since the     |                   |
|         | t |                  | instability of    |                   |
|         | 8 |                  | the instrument    |                   |
|         | % |                  | due to the gas    |                   |
|         | s |                  | supply had not    |                   |
|         | t |                  | been resolved     |                   |
|         | a |                  | until recently,   |                   |
|         | r |                  | the direct cause  |                   |
|         | t |                  | of the high bias  |                   |
|         | i |                  | was uncertain.    |                   |
|         | n |                  | The gas supply    |                   |
|         | g |                  | problem has been  |                   |
|         | m |                  | solved and new    |                   |
|         | i |                  | calibration       |                   |
|         | d |                  | standards were    |                   |
|         | - |                  | prepared at the   |                   |
|         | J |                  | end of September  |                   |
|         | u |                  | 2005.             |                   |
|         | l |                  |                   |                   |
|         | y |                  |                   |                   |
|         | 2 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 5 |                  |                   |                   |
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|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [[]{#n  | * |                  | **The NWQL agrees | **We will         |
| wql0031 | * |                  | with the          | continue to look  |
| .anch   | T |                  | assessment.**     | for causes for    |
| or}**Fl | h |                  |                   | the bias and      |
| uoride, | e |                  |                   | correct as        |
| Fil     | p |                  |                   | necessary.**      |
| tered** | o |                  |                   |                   |
| ](http: | s |                  |                   |                   |
| //bqs.u | i |                  |                   |                   |
| sgs.gov | t |                  |                   |                   |
| /bsp/QA | i |                  |                   |                   |
| DATA_al | v |                  |                   |                   |
| l/05DEC | e |                  |                   |                   |
| /DEC05N | b |                  |                   |                   |
| WQL0095 | i |                  |                   |                   |
| 0B.gif) | a |                  |                   |                   |
| **\     | s |                  |                   |                   |
| ISE     | ( |                  |                   |                   |
| labcode | o |                  |                   |                   |
| 0031    | v |                  |                   |                   |
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| armcode | r |                  |                   |                   |
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|         | * |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| *P      |   |                  |                   |                   |
| revious |   |                  |                   |                   |
| c       |   |                  |                   |                   |
| omments |   |                  |                   |                   |
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| fi      |   |                  |                   |                   |
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| ISE,    |   |                  |                   |                   |
| labcode |   |                  |                   |                   |
| 0031,   |   |                  |                   |                   |
| p       |   |                  |                   |                   |
| armcode |   |                  |                   |                   |
| 0950B*  |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | D |                  | A vendor service  | New standards     |
|         | a |                  | call that         | were prepared and |
| >       | t |                  | optimized the     | put online the    |
|  QADATA | a |                  | system (new       | last week of      |
| >       | r |                  | electrodes,       | September;        |
| Summary | e |                  | software,         | concentrations    |
| >       | c |                  | instrument        | are being         |
| October | e |                  | cleaning and      | verified by       |
| > 2005  | i |                  | maintenance) in   | another           |
|         | v |                  | May had some      | instrument. We    |
|         | e |                  | effect on bias    | are verifying     |
|         | d |                  | and improved      | instrument and    |
|         | s |                  | blank and         | software          |
|         | i |                  | carryover         | settings. We will |
|         | n |                  | performance. New  | continue to       |
|         | c |                  | standards were    | monitor the line  |
|         | e |                  | put on-line prior | for improvement   |
|         | t |                  | to the service    | in bias.          |
|         | h |                  | call and slightly |                   |
|         | e |                  | improved the      |                   |
|         | l |                  | bias. A new lot   |                   |
|         | a |                  | of reagent was    |                   |
|         | s |                  | put on line in    |                   |
|         | t |                  | August.           |                   |
|         | Q |                  |                   |                   |
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|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | A |                  | We are continuing | The line will be  |
|         | l |                  | to see if we can  | monitored for     |
| >       | t |                  | improve the line  | improvement.      |
|  QADATA | h |                  | performance.      |                   |
| >       | o |                  |                   |                   |
| Summary | u |                  |                   |                   |
| >       | g |                  |                   |                   |
|  August | h |                  |                   |                   |
| > 2005  | a |                  |                   |                   |
|         | p |                  |                   |                   |
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|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | e |                  |                   |                   |
|         | x |                  |                   |                   |
|         | t |                  |                   |                   |
|         | Q |                  |                   |                   |
|         | A |                  |                   |                   |
|         | D |                  |                   |                   |
|         | A |                  |                   |                   |
|         | T |                  |                   |                   |
|         | A |                  |                   |                   |
|         | S |                  |                   |                   |
|         | u |                  |                   |                   |
|         | m |                  |                   |                   |
|         | m |                  |                   |                   |
|         | a |                  |                   |                   |
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|         | y |                  |                   |                   |
|         | i |                  |                   |                   |
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|         | d |                  |                   |                   |
|         | i |                  |                   |                   |
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|         | t |                  |                   |                   |
|         | r |                  |                   |                   |
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|         | d |                  |                   |                   |
|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | D |                  | New standards     | Continue          |
|         | a |                  | prepared early    | monitoring line   |
| >       | t |                  | May and new       | and discuss with  |
|  QADATA | a |                  | electrode         | BQS during next   |
| >       | s |                  | installed May 18. | meeting.          |
| Summary | t |                  | Only two data     |                   |
| > June  | i |                  | points on BQS     |                   |
| > 2005  | l |                  | charts since mid  |                   |
|         | l |                  | May.              |                   |
|         | e |                  |                   |                   |
|         | x |                  |                   |                   |
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|         | t |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
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|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | s |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | h |                  |                   |                   |
|         | i |                  |                   |                   |
|         | g |                  |                   |                   |
|         | h |                  |                   |                   |
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|         | r |                  |                   |                   |
|         | t |                  |                   |                   |
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|         | e |                  |                   |                   |
|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | D |                  | The NWQL agrees   | We are ordering   |
|         | a |                  | with the          | new stock         |
| >       | t |                  | observation.      | standards and     |
|  QADATA | a |                  |                   | will prepare and  |
| >       | s |                  |                   | verify new        |
| Summary | i |                  |                   | working standards |
| > April | n |                  |                   | by April 29,      |
| > 2005  | c |                  |                   | 2005. We also     |
|         | e |                  |                   | ordered a new     |
|         | m |                  |                   | electrode to see  |
|         | i |                  |                   | if the current    |
|         | d |                  |                   | electrode is      |
|         | - |                  |                   | contributing to   |
|         | N |                  |                   | the bias.         |
|         | o |                  |                   |                   |
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|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [[]{#n  | * |                  | **The NWQL agrees | **None required   |
| wql0056 | * |                  | with the          | at this time.**   |
| .an     | T |                  | assessment.**     |                   |
| chor}** | h |                  |                   |                   |
| Silica, | e |                  |                   |                   |
| Fil     | p |                  |                   |                   |
| tered** | o |                  |                   |                   |
| ](http: | s |                  |                   |                   |
| //bqs.u | i |                  |                   |                   |
| sgs.gov | t |                  |                   |                   |
| /bsp/QA | i |                  |                   |                   |
| DATA_al | v |                  |                   |                   |
| l/05DEC | e |                  |                   |                   |
| /DEC05N | b |                  |                   |                   |
| WQL0095 | i |                  |                   |                   |
| 5C.gif) | a |                  |                   |                   |
| **\     | s |                  |                   |                   |
| Colo    | c |                  |                   |                   |
| rimetry | a |                  |                   |                   |
| labcode | n |                  |                   |                   |
| 0056    | b |                  |                   |                   |
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|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | e |                  |                   |                   |
|         | d |                  |                   |                   |
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|         | r |                  |                   |                   |
|         | f |                  |                   |                   |
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|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | c |                  |                   |                   |
|         | e |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | M |                  |                   |                   |
|         | - |                  |                   |                   |
|         | 1 |                  |                   |                   |
|         | 6 |                  |                   |                   |
|         | 4 |                  |                   |                   |
|         | . |                  |                   |                   |
|         | B |                  |                   |                   |
|         | l |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | d |                  |                   |                   |
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|         | a |                  |                   |                   |
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|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | i |                  |                   |                   |
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|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | g |                  |                   |                   |
|         | M |                  |                   |                   |
|         | - |                  |                   |                   |
|         | 1 |                  |                   |                   |
|         | 6 |                  |                   |                   |
|         | 4 |                  |                   |                   |
|         | e |                  |                   |                   |
|         | x |                  |                   |                   |
|         | h |                  |                   |                   |
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|         | b |                  |                   |                   |
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|         | l |                  |                   |                   |
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|         | i |                  |                   |                   |
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|         | s |                  |                   |                   |
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|         | n |                  |                   |                   |
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|         | l |                  |                   |                   |
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|         | l |                  |                   |                   |
|         | e |                  |                   |                   |
|         | v |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | l |                  |                   |                   |
|         | i |                  |                   |                   |
|         | t |                  |                   |                   |
|         | y |                  |                   |                   |
|         | d |                  |                   |                   |
|         | e |                  |                   |                   |
|         | m |                  |                   |                   |
|         | o |                  |                   |                   |
|         | n |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | r |                  |                   |                   |
|         | a |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | g |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | a |                  |                   |                   |
|         | t |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | i |                  |                   |                   |
|         | s |                  |                   |                   |
|         | m |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | o |                  |                   |                   |
|         | d |                  |                   |                   |
|         | i |                  |                   |                   |
|         | s |                  |                   |                   |
|         | o |                  |                   |                   |
|         | p |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | a |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | g |                  |                   |                   |
|         | w |                  |                   |                   |
|         | i |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | s |                  |                   |                   |
|         | p |                  |                   |                   |
|         | e |                  |                   |                   |
|         | c |                  |                   |                   |
|         | i |                  |                   |                   |
|         | f |                  |                   |                   |
|         | i |                  |                   |                   |
|         | c |                  |                   |                   |
|         | a |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | o |                  |                   |                   |
|         | n |                  |                   |                   |
|         | s |                  |                   |                   |
|         | . |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| *P      |   |                  |                   |                   |
| revious |   |                  |                   |                   |
| c       |   |                  |                   |                   |
| omments |   |                  |                   |                   |
| for     |   |                  |                   |                   |
| silica, |   |                  |                   |                   |
| fi      |   |                  |                   |                   |
| ltered, |   |                  |                   |                   |
| color   |   |                  |                   |                   |
| imetry, |   |                  |                   |                   |
| labcode |   |                  |                   |                   |
| 0056,   |   |                  |                   |                   |
| p       |   |                  |                   |                   |
| armcode |   |                  |                   |                   |
| 0955C*  |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | A |                  | During May 2005,  | The NWQL will     |
|         | n |                  | the Nutrients     | continue to       |
| >       | u |                  | Unit tested       | monitor the       |
|  QADATA | p |                  | certified         | Online and IBSP   |
| >       | w |                  | reference stocks  | Control Charts.   |
| Summary | a |                  | to use for        |                   |
| >       | r |                  | calibration       | All IBSP mixes    |
| October | d |                  | standards from    | that contain M164 |
| > 2005  | s |                  | three different   | have had a high   |
|         | h |                  | manufacturers.    | bias for labcode  |
|         | i |                  | The overall       | 0056 no matter    |
|         | f |                  | difference among  | what the SiO~2~   |
|         | t |                  | the three was 5%, | concentration of  |
|         | i |                  | and the reference | the mix was.      |
|         | n |                  | stock with the    | Samples that do   |
|         | t |                  | median value was  | not contain M164  |
|         | h |                  | selected for use  | give values that  |
|         | e |                  | starting in June  | are close to      |
|         | p |                  | 2005. This change | their MPVs. When  |
|         | e |                  | caused the small  | samples           |
|         | r |                  | shift in the      | containing M164   |
|         | c |                  | values of the     | are diluted x10,  |
|         | e |                  | IBSP samples. It  | the interference  |
|         | n |                  | should be noted   | is much lower.    |
|         | t |                  | that the shift in | The Nutrients     |
|         | r |                  | values was        | Unit will         |
|         | e |                  | smaller for       | continue to       |
|         | c |                  | samples that do   | attempt to        |
|         | o |                  | not contain M164  | determine the     |
|         | v |                  | than for those    | cause of the      |
|         | e |                  | that contain      | interference.     |
|         | r |                  | M164, and that    |                   |
|         | y |                  | the online third  |                   |
|         | i |                  | party QC samples  |                   |
|         | s |                  | that had a small  |                   |
|         | s |                  | low bias shifted  |                   |
|         | h |                  | to no bias after  |                   |
|         | o |                  | the calibration   |                   |
|         | w |                  | standards were    |                   |
|         | n |                  | changed.          |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | t |                  |                   |                   |
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|         | J |                  |                   |                   |
|         | u |                  |                   |                   |
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|         | e |                  |                   |                   |
|         | 2 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 5 |                  |                   |                   |
|         | . |                  |                   |                   |
|         | O |                  |                   |                   |
|         | v |                  |                   |                   |
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|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | l |                  |                   |                   |
|         | , |                  |                   |                   |
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|         | 5 |                  |                   |                   |
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|         | 5 |                  |                   |                   |
|         | % |                  |                   |                   |
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|         | J |                  |                   |                   |
|         | u |                  |                   |                   |
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|         | 2 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 5 |                  |                   |                   |
|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [[]{#n  | * |                  |                   |                   |
| wql0069 | * |                  |                   |                   |
| .anc    | C |                  |                   |                   |
| hor}**S | o |                  |                   |                   |
| pecific | r |                  |                   |                   |
| Condu   | r |                  |                   |                   |
| ctance, | e |                  |                   |                   |
| Whol    | c |                  |                   |                   |
| e-Water | t |                  |                   |                   |
| Re      | i |                  |                   |                   |
| coverab | v |                  |                   |                   |
| le**](h | e |                  |                   |                   |
| ttp://b | a |                  |                   |                   |
| qs.usgs | c |                  |                   |                   |
| .gov/bs | t |                  |                   |                   |
| p/QADAT | i |                  |                   |                   |
| A_all/0 | o |                  |                   |                   |
| 5DEC/DE | n |                  |                   |                   |
| C05NWQL | s |                  |                   |                   |
| 90095A. | t |                  |                   |                   |
| gif)**\ | a |                  |                   |                   |
| Elect   | k |                  |                   |                   |
| rometry | e |                  |                   |                   |
| labcode | n |                  |                   |                   |
| 0069    | b |                  |                   |                   |
| p       | y |                  |                   |                   |
| armcode | t |                  |                   |                   |
| 9       | h |                  |                   |                   |
| 0095A** | e |                  |                   |                   |
|         | N |                  |                   |                   |
|         | W |                  |                   |                   |
|         | Q |                  |                   |                   |
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|         | m |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
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|         | h |                  |                   |                   |
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|         | w |                  |                   |                   |
|         | n |                  |                   |                   |
|         | o |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | . |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
|         |   |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
|         | N |                  |                   |                   |
|         | o |                  |                   |                   |
|         | c |                  |                   |                   |
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|         | r |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | c |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | a |                  |                   |                   |
|         | c |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | o |                  |                   |                   |
|         | n |                  |                   |                   |
|         | n |                  |                   |                   |
|         | e |                  |                   |                   |
|         | c |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | y |                  |                   |                   |
|         | . |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| *P      |   |                  |                   |                   |
| revious |   |                  |                   |                   |
| c       |   |                  |                   |                   |
| omments |   |                  |                   |                   |
| for     |   |                  |                   |                   |
| s       |   |                  |                   |                   |
| pecific |   |                  |                   |                   |
| condu   |   |                  |                   |                   |
| ctance, |   |                  |                   |                   |
| whol    |   |                  |                   |                   |
| e-water |   |                  |                   |                   |
| recov   |   |                  |                   |                   |
| erable, |   |                  |                   |                   |
| electr  |   |                  |                   |                   |
| ometry, |   |                  |                   |                   |
| labcode |   |                  |                   |                   |
| 0069,   |   |                  |                   |                   |
| p       |   |                  |                   |                   |
| armcode |   |                  |                   |                   |
| 90095A* |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
|         | A |                  | A new combination | No more           |
|         | d |                  | electrode was     | corrective action |
|         | o |                  | installed 7/14/05 | will be taken at  |
|         | w |                  | for pH and        | this time. We     |
|         | n |                  | conductance. Due  | will continue to  |
|         | w |                  | to poor           | closely monitor   |
|         | a |                  | performance the   | performance of    |
|         | r |                  | combination       | the specific      |
|         | d |                  | electrode was     | conductance       |
|         | t |                  | replaced with     | probe.            |
|         | r |                  | separate          |                   |
|         | e |                  | electrodes on     |                   |
|         | n |                  | 7/20/05. Specific |                   |
|         | d |                  | conductance QC    |                   |
|         | i |                  | problems started  |                   |
|         | n |                  | about 7/26/05.    |                   |
|         | t |                  | The specific      |                   |
|         | h |                  | conductance probe |                   |
|         | e |                  | was again         |                   |
|         | p |                  | replaced 8/3/05.  |                   |
|         | e |                  | The downward      |                   |
|         | r |                  | trend seen in the |                   |
|         | c |                  | BQS charts was    |                   |
|         | e |                  | observed during   |                   |
|         | n |                  | the transition to |                   |
|         | t |                  | the new probes.   |                   |
|         | r |                  | Present QC is     |                   |
|         | e |                  | acceptable and    |                   |
|         | c |                  | consistent; third |                   |
|         | o |                  | party check       |                   |
|         | v |                  | sample results    |                   |
|         | e |                  | have been more    |                   |
|         | r |                  | consistent and    |                   |
|         | y |                  | close to accepted |                   |
|         | i |                  | values.           |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | h |                  |                   |                   |
|         | o |                  |                   |                   |
|         | w |                  |                   |                   |
|         | n |                  |                   |                   |
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|         | r |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | v |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | u |                  |                   |                   |
|         | e |                  |                   |                   |
|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+

######