##### QADATA Summary -- February 2008

The Inorganic Blind Sample Project (IBSP) of the Branch of Quality
Systems reviews about 90 inorganic analytical lines at the National
Water Quality Laboratory (NWQL) using double-blind, quality-control
samples. A summary of this review, the QADATA Summary, is a short report
commenting on only those analytical lines for which the quality-control
charts indicate or have indicated a bias and/or higher than expected
variability. Overall, the vast majority of the inorganic methods at the
NWQL demonstrate acceptable variability and little or no bias.

The data reviewed in this summary is for the time period 07/01/07
through 01/31/08; however, longer-range charts may be used when they add
clarity to the problem. The attached quality-control charts contain data
from samples that have been subject to the same laboratory handling
procedures as the samples submitted by the USGS district offices, and
the data have the same level of quality-control review as the data
released to the districts. Therefore, any factors that affect the data
displayed on the IBSP quality-control charts should also affect the
districts' data in a similar manner. Data from samples known to have
been affected by a problem independent of the NWQL are removed from the
charts.

In this report, the "Problem" is determined and written by IBSP and then
sent to the NWQL. The NWQL then gets two weeks to respond to the issue
by writing an "NWQL Comment" and a "Corrective Action." Comments from
the 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 on how the corrective
actions are affecting subsequent data.

Current charts (updated twice weekly) may be accessed at
<http://bqs.usgs.gov/bsp/Controlcharts.htm>. Laboratory and district
personnel may have their own custom quality-assurance data retrieval to
parallel their objectives by contacting Ted Struzeski (303.236.1872,
<struzesk@usgs.gov>). Charts pertaining specifically to this report can
be accessed electronically by following the underlined hyperlinks
embedded within the report and associated with each analysis discussed.

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

*Tedmund M. Struzeski*

<struzesk@usgs.gov>

Table of Contents

Report Highlights Page

[One-Page Summary](#Highlights) 3

Detailed Description by Analyte

Trace Metals

[Copper, Unfiltered,](#nwql3129) cICP-MS, Labcode 3129, Parmcode
01042PLM10 4

[Manganese, Unfiltered,](#nwql2363) ICP, Labcode 2363, Parmcode
01055PLA15 4

[Mercury, Filtered,](#nwql2707) CVAF, Labcode 2707, Parmcode 71890CV014
5

[Mercury, Unfiltered,](#nwql2708) CVAF, Labcode 2708, Parmcode
71900CV018 6

[Vanadium, Unfiltered,](#nwql3134) cICP-MS, Labcode 3135, Parmcode
01087PLM10 6

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

Majors

[Fluoride, Filtered,](#nwql2362) ISE, Labcode 0031, Parmcode 00950ISE05
9

[Magnesium, Unfiltered,](#nwql2362) ICP, Labcode 2362, Parmcode
00927PLA15 9

[Sulfate, Filtered,](#nwql1572) IC, Labcode 1572, Parmcode 00945IC022 10

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

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

1.  [Copper,](http://bqs.usgs.gov/bsp/QADATA_all/08Feb/Feb08NWQL01042PLM10.gif)
    unfiltered, cICP-MS, parmcode 01042PLM10-- High variability starting
    mid October 2007.

2.  [Fluoride,](http://bqs.usgs.gov/bsp/QADATA_all/08Feb/Feb08NWQL00950ISE05.gif)
    filtered, ISE, parmcode 0950ISE05-- Positive bias starting mid
    December 2007. Current bias is 16%

3.  [Mercury,](http://bqs.usgs.gov/bsp/QADATA_all/08Feb/Feb08NWQL71890CV014.gif)
    filtered, CVAF, parmcode 71890CV014 -- Negative bias starting
    May 2007. Most recent data show improvement.

4.  [Mercury,](http://bqs.usgs.gov/bsp/QADATA_all/08Feb/Feb08NWQL71900CV018.gif)
    unfiltered, CVAF, parmcode 71900CV018 -- Negative bias starting mid
    May 2007. Most recent data show improvement.

5.  [Magnesium,](http://bqs.usgs.gov/bsp/QADATA_all/08Feb/Feb08NWQL00927PLA15.gif)
    unfiltered, ICP, parmcode 00927PLA15-- Negative bias starting mid
    August 2007. Current bias is -6.6%.

6.  [Vanadium,](http://bqs.usgs.gov/bsp/QADATA_all/08Feb/Feb08BBPNWQL01087PLM10.xls)
    unfiltered, cICP-MS, parmcode 01087PLM10-- High variability and
    positive bias (for blind-blanks only) starting November 2007.

7.  [Zinc,](http://bqs.usgs.gov/bsp/QADATA_all/08Feb/Feb08NWQL01090PLM10.gif)
    filtered, cICP-MS, parmcode 01090PLM10 -- Positive bias starting
    January ***2007***. Current bias is 21%.

NWQL PERFORMANCE ON IBSP SAMPLES

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

+---------+---+------------------+-------------------+-------------------+
| **Trace | * |                  | **NWQL Comment**  | **Corrective      |
| Metal   | * |                  |                   | Action**          |
| De      | P |                  |                   |                   |
| termina | r |                  |                   |                   |
| tions** | o |                  |                   |                   |
|         | b |                  |                   |                   |
|         | l |                  |                   |                   |
|         | e |                  |                   |                   |
|         | m |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+=========+===+==================+===================+===================+
| [[]{#n  | * |                  | **We have looked  | **We will         |
| wql3129 | * |                  | at a number of    | continue to       |
| .an     | H |                  | possible causes,  | investigate       |
| chor}** | i |                  | but none of the   | possible causes   |
| Copper, | g |                  | attempted         | and request a     |
| Un      | h |                  | corrections has   | review of the     |
| filtere | v |                  | been proven to    | process by the    |
| d**](ht | a |                  | correct the issue | Quality Assurance |
| tp://bq | r |                  | yet. The most     | Section of the    |
| s.usgs. | i |                  | recent points are | NWQL. The NWQL    |
| gov/bsp | a |                  | well within       | will continue to  |
| /QADATA | b |                  | limits and one of | monitor the       |
| _all/08 | i |                  | our attempted     | newest data       |
| Feb/Feb | l |                  | corrections may   | closely.**        |
| 08NWQL0 | i |                  | have fixed the    |                   |
| 1042PLM | t |                  | problem.**        |                   |
| 10.gif) | y |                  |                   |                   |
| **      | i |                  |                   |                   |
| cICP-MS | s |                  |                   |                   |
| labcode | d |                  |                   |                   |
| 3129    | e |                  |                   |                   |
| p       | m |                  |                   |                   |
| armcode | o |                  |                   |                   |
| 1042    | n |                  |                   |                   |
| PLM10** | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | r |                  |                   |                   |
|         | a |                  |                   |                   |
|         | t |                  |                   |                   |
|         | e |                  |                   |                   |
|         | d |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | g |                  |                   |                   |
|         | m |                  |                   |                   |
|         | i |                  |                   |                   |
|         | d |                  |                   |                   |
|         | O |                  |                   |                   |
|         | c |                  |                   |                   |
|         | t |                  |                   |                   |
|         | o |                  |                   |                   |
|         | b |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | 2 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 7 |                  |                   |                   |
|         | . |                  |                   |                   |
|         | T |                  |                   |                   |
|         | h |                  |                   |                   |
|         | i |                  |                   |                   |
|         | s |                  |                   |                   |
|         | v |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | l |                  |                   |                   |
|         | i |                  |                   |                   |
|         | t |                  |                   |                   |
|         | y |                  |                   |                   |
|         | i |                  |                   |                   |
|         | s |                  |                   |                   |
|         | n |                  |                   |                   |
|         | o |                  |                   |                   |
|         | t |                  |                   |                   |
|         | s |                  |                   |                   |
|         | h |                  |                   |                   |
|         | o |                  |                   |                   |
|         | w |                  |                   |                   |
|         | n |                  |                   |                   |
|         | f |                  |                   |                   |
|         | o |                  |                   |                   |
|         | r |                  |                   |                   |
|         | f |                  |                   |                   |
|         | i |                  |                   |                   |
|         | l |                  |                   |                   |
|         | t |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | d |                  |                   |                   |
|         | c |                  |                   |                   |
|         | o |                  |                   |                   |
|         | p |                  |                   |                   |
|         | p |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | b |                  |                   |                   |
|         | y |                  |                   |                   |
|         | c |                  |                   |                   |
|         | I |                  |                   |                   |
|         | C |                  |                   |                   |
|         | P |                  |                   |                   |
|         | - |                  |                   |                   |
|         | M |                  |                   |                   |
|         | S |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
|         | ( |                  |                   |                   |
|         | [ |                  |                   |                   |
|         | p |                  |                   |                   |
|         | c |                  |                   |                   |
|         | 1 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 4 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | P |                  |                   |                   |
|         | L |                  |                   |                   |
|         | M |                  |                   |                   |
|         | 1 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | ] |                  |                   |                   |
|         | ( |                  |                   |                   |
|         | h |                  |                   |                   |
|         | t |                  |                   |                   |
|         | t |                  |                   |                   |
|         | p |                  |                   |                   |
|         | : |                  |                   |                   |
|         | / |                  |                   |                   |
|         | / |                  |                   |                   |
|         | b |                  |                   |                   |
|         | q |                  |                   |                   |
|         | s |                  |                   |                   |
|         | . |                  |                   |                   |
|         | u |                  |                   |                   |
|         | s |                  |                   |                   |
|         | g |                  |                   |                   |
|         | s |                  |                   |                   |
|         | . |                  |                   |                   |
|         | g |                  |                   |                   |
|         | o |                  |                   |                   |
|         | v |                  |                   |                   |
|         | / |                  |                   |                   |
|         | b |                  |                   |                   |
|         | s |                  |                   |                   |
|         | p |                  |                   |                   |
|         | / |                  |                   |                   |
|         | Q |                  |                   |                   |
|         | A |                  |                   |                   |
|         | D |                  |                   |                   |
|         | A |                  |                   |                   |
|         | T |                  |                   |                   |
|         | A |                  |                   |                   |
|         | _ |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | l |                  |                   |                   |
|         | / |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 8 |                  |                   |                   |
|         | F |                  |                   |                   |
|         | e |                  |                   |                   |
|         | b |                  |                   |                   |
|         | / |                  |                   |                   |
|         | F |                  |                   |                   |
|         | e |                  |                   |                   |
|         | b |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 8 |                  |                   |                   |
|         | N |                  |                   |                   |
|         | W |                  |                   |                   |
|         | Q |                  |                   |                   |
|         | L |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 1 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 4 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | P |                  |                   |                   |
|         | L |                  |                   |                   |
|         | M |                  |                   |                   |
|         | 1 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | . |                  |                   |                   |
|         | g |                  |                   |                   |
|         | i |                  |                   |                   |
|         | f |                  |                   |                   |
|         | ) |                  |                   |                   |
|         | [ |                  |                   |                   |
|         | ) |                  |                   |                   |
|         | ] |                  |                   |                   |
|         | { |                  |                   |                   |
|         | . |                  |                   |                   |
|         | u |                  |                   |                   |
|         | n |                  |                   |                   |
|         | d |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | l |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | e |                  |                   |                   |
|         | } |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
|         | . |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| []      |   |                  |                   |                   |
| {.mark} |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [[]{#n  | * |                  |                   | **The NWQL will   |
| wql2363 | * |                  |                   | continue to       |
| .ancho  | D |                  |                   | monitor the       |
| r}**Man | a |                  |                   | instrument for    |
| ganese, | t |                  |                   | bias and          |
| Un      | a |                  |                   | variability.**    |
| filtere | f |                  |                   |                   |
| d**](ht | r |                  |                   |                   |
| tp://bq | o |                  |                   |                   |
| s.usgs. | m |                  |                   |                   |
| gov/bsp | s |                  |                   |                   |
| /QADATA | a |                  |                   |                   |
| _all/08 | m |                  |                   |                   |
| Feb/Feb | p |                  |                   |                   |
| 08NWQL0 | l |                  |                   |                   |
| 1055PLA | e |                  |                   |                   |
| 15.gif) | s |                  |                   |                   |
| **ICP   | a |                  |                   |                   |
| labcode | n |                  |                   |                   |
| 2363    | a |                  |                   |                   |
| p       | l |                  |                   |                   |
| armcode | y |                  |                   |                   |
| 01055   | z |                  |                   |                   |
| PLA15** | e |                  |                   |                   |
|         | d |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | c |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | l |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | m |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | s |                  |                   |                   |
|         | h |                  |                   |                   |
|         | o |                  |                   |                   |
|         | w |                  |                   |                   |
|         | a |                  |                   |                   |
|         | c |                  |                   |                   |
|         | c |                  |                   |                   |
|         | e |                  |                   |                   |
|         | p |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | b |                  |                   |                   |
|         | l |                  |                   |                   |
|         | e |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | a |                  |                   |                   |
|         | n |                  |                   |                   |
|         | d |                  |                   |                   |
|         | v |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | l |                  |                   |                   |
|         | i |                  |                   |                   |
|         | t |                  |                   |                   |
|         | y |                  |                   |                   |
|         | . |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
|         |   |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
|         | N |                  |                   |                   |
|         | o |                  |                   |                   |
|         | c |                  |                   |                   |
|         | o |                  |                   |                   |
|         | 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     |   |                  |                   |                   |
| man     |   |                  |                   |                   |
| ganese, |   |                  |                   |                   |
| unfi    |   |                  |                   |                   |
| ltered, |   |                  |                   |                   |
| labcode |   |                  |                   |                   |
| 2363,   |   |                  |                   |                   |
| p       |   |                  |                   |                   |
| armcode |   |                  |                   |                   |
| 0105    |   |                  |                   |                   |
| 5PLA15* |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | D |                  | Internal NWQL     | The NWQL will     |
|         | a |                  | charts indicate a | continue to       |
| QADATA  | t |                  | similar trend.    | monitor the       |
| Summary | a |                  |                   | instrument for    |
| D       | f |                  |                   | bias and          |
| ecember | o |                  |                   | variability.      |
| 2007    | r |                  |                   |                   |
|         | s |                  |                   |                   |
|         | a |                  |                   |                   |
|         | m |                  |                   |                   |
|         | p |                  |                   |                   |
|         | l |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | a |                  |                   |                   |
|         | n |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | y |                  |                   |                   |
|         | z |                  |                   |                   |
|         | e |                  |                   |                   |
|         | d |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | o |                  |                   |                   |
|         | f |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | l |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | m |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | s |                  |                   |                   |
|         | h |                  |                   |                   |
|         | o |                  |                   |                   |
|         | w |                  |                   |                   |
|         | a |                  |                   |                   |
|         | n |                  |                   |                   |
|         | i |                  |                   |                   |
|         | m |                  |                   |                   |
|         | p |                  |                   |                   |
|         | r |                  |                   |                   |
|         | o |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | m |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | . |                  |                   |                   |
|         | A |                  |                   |                   |
|         | s |                  |                   |                   |
|         | o |                  |                   |                   |
|         | f |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | u |                  |                   |                   |
|         | l |                  |                   |                   |
|         | t |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | h |                  |                   |                   |
|         | o |                  |                   |                   |
|         | w |                  |                   |                   |
|         | a |                  |                   |                   |
|         | n |                  |                   |                   |
|         | e |                  |                   |                   |
|         | g |                  |                   |                   |
|         | a |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | o |                  |                   |                   |
|         | f |                  |                   |                   |
|         | l |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | a |                  |                   |                   |
|         | n |                  |                   |                   |
|         | 5 |                  |                   |                   |
|         | % |                  |                   |                   |
|         | o |                  |                   |                   |
|         | n |                  |                   |                   |
|         | a |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | a |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | . |                  |                   |                   |
|         |   |                  |                   |                   |
|         | A |                  |                   |                   |
|         | n |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | y |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | h |                  |                   |                   |
|         | o |                  |                   |                   |
|         | u |                  |                   |                   |
|         | l |                  |                   |                   |
|         | d |                  |                   |                   |
|         | b |                  |                   |                   |
|         | e |                  |                   |                   |
|         | c |                  |                   |                   |
|         | l |                  |                   |                   |
|         | o |                  |                   |                   |
|         | s |                  |                   |                   |
|         | e |                  |                   |                   |
|         | l |                  |                   |                   |
|         | y |                  |                   |                   |
|         | m |                  |                   |                   |
|         | o |                  |                   |                   |
|         | n |                  |                   |                   |
|         | i |                  |                   |                   |
|         | t |                  |                   |                   |
|         | o |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | d |                  |                   |                   |
|         | u |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | l |                  |                   |                   |
|         | 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    | T |                  | NWQL online       | The NWQL had the  |
|         | h |                  | charts also show  | instrument        |
| QADATA  | e |                  | a negative bias   | manufacturer come |
| Summary | d |                  | near the          | out (the week of  |
| October | a |                  | concentrations on | October 15th,     |
| 2007    | t |                  | the BQS charts.   | 2007) and do a    |
|         | a |                  |                   | complete check of |
|         | s |                  |                   | the instrument.   |
|         | h |                  |                   | He optimized the  |
|         | o |                  |                   | instrument and    |
|         | w |                  |                   | initial runs      |
|         | a |                  |                   | indicate reduced  |
|         | s |                  |                   | variability. NWQL |
|         | l |                  |                   | will continue to  |
|         | i |                  |                   | monitor the       |
|         | g |                  |                   | instrument.       |
|         | h |                  |                   |                   |
|         | t |                  |                   |                   |
|         | n |                  |                   |                   |
|         | e |                  |                   |                   |
|         | g |                  |                   |                   |
|         | a |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | w |                  |                   |                   |
|         | i |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | l |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | u |                  |                   |                   |
|         | l |                  |                   |                   |
|         | t |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | l |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | x |                  |                   |                   |
|         | m |                  |                   |                   |
|         | o |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | s |                  |                   |                   |
|         | b |                  |                   |                   |
|         | e |                  |                   |                   |
|         | l |                  |                   |                   |
|         | o |                  |                   |                   |
|         | w |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | v |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | u |                  |                   |                   |
|         | e |                  |                   |                   |
|         | . |                  |                   |                   |
|         | S |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | c |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | l |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | m |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | u |                  |                   |                   |
|         | l |                  |                   |                   |
|         | t |                  |                   |                   |
|         | s |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | o |                  |                   |                   |
|         | n |                  |                   |                   |
|         | a |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | a |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | 6 |                  |                   |                   |
|         | . |                  |                   |                   |
|         | 4 |                  |                   |                   |
|         | % |                  |                   |                   |
|         | b |                  |                   |                   |
|         | e |                  |                   |                   |
|         | l |                  |                   |                   |
|         | o |                  |                   |                   |
|         | w |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | v |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | u |                  |                   |                   |
|         | e |                  |                   |                   |
|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [[]{#n  | * |                  |                   | **The NWQL will   |
| wql2707 | * |                  |                   | continue to       |
| .anc    | S |                  |                   | monitor the       |
| hor}**M | a |                  |                   | instrument for    |
| ercury, | m |                  |                   | bias.**           |
| Filtere | p |                  |                   |                   |
| d**](ht | l |                  |                   |                   |
| tp://bq | e |                  |                   |                   |
| s.usgs. | s |                  |                   |                   |
| gov/bsp | a |                  |                   |                   |
| /QADATA | n |                  |                   |                   |
| _all/08 | a |                  |                   |                   |
| Feb/Feb | l |                  |                   |                   |
| 08NWQL7 | y |                  |                   |                   |
| 1890CV0 | z |                  |                   |                   |
| 14.gif) | e |                  |                   |                   |
| **CVAF  | d |                  |                   |                   |
| labcode | a |                  |                   |                   |
| 2707    | s |                  |                   |                   |
| p       | o |                  |                   |                   |
| armcode | f |                  |                   |                   |
| 71890   | t |                  |                   |                   |
| CV014** | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | l |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | m |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | s |                  |                   |                   |
|         | h |                  |                   |                   |
|         | o |                  |                   |                   |
|         | w |                  |                   |                   |
|         | a |                  |                   |                   |
|         | n |                  |                   |                   |
|         | i |                  |                   |                   |
|         | m |                  |                   |                   |
|         | p |                  |                   |                   |
|         | r |                  |                   |                   |
|         | o |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | m |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | e |                  |                   |                   |
|         | g |                  |                   |                   |
|         | a |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | . |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
|         |   |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
|         | A |                  |                   |                   |
|         | n |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | y |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | h |                  |                   |                   |
|         | o |                  |                   |                   |
|         | u |                  |                   |                   |
|         | l |                  |                   |                   |
|         | d |                  |                   |                   |
|         | b |                  |                   |                   |
|         | e |                  |                   |                   |
|         | c |                  |                   |                   |
|         | l |                  |                   |                   |
|         | o |                  |                   |                   |
|         | s |                  |                   |                   |
|         | e |                  |                   |                   |
|         | l |                  |                   |                   |
|         | y |                  |                   |                   |
|         | m |                  |                   |                   |
|         | o |                  |                   |                   |
|         | n |                  |                   |                   |
|         | i |                  |                   |                   |
|         | t |                  |                   |                   |
|         | 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 |                  |                   |                   |
|         | t |                  |                   |                   |
|         | r |                  |                   |                   |
|         | i |                  |                   |                   |
|         | b |                  |                   |                   |
|         | u |                  |                   |                   |
|         | t |                  |                   |                   |
|         | e |                  |                   |                   |
|         | d |                  |                   |                   |
|         | . |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| *P      |   |                  |                   |                   |
| revious |   |                  |                   |                   |
| c       |   |                  |                   |                   |
| omments |   |                  |                   |                   |
| for     |   |                  |                   |                   |
| m       |   |                  |                   |                   |
| ercury, |   |                  |                   |                   |
| fi      |   |                  |                   |                   |
| ltered, |   |                  |                   |                   |
| labcode |   |                  |                   |                   |
| 2707,   |   |                  |                   |                   |
| p       |   |                  |                   |                   |
| armcode |   |                  |                   |                   |
| 7189    |   |                  |                   |                   |
| 0CV014* |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | R |                  | New calibration   | The NWQL will     |
|         | e |                  | standards were    | continue to       |
| QADATA  | s |                  | prepared in early | monitor the       |
| Summary | u |                  | December;         | instrument for    |
| D       | l |                  | however, due to   | bias as more data |
| ecember | t |                  | instrument        | becomes           |
| 2007    | s |                  | problems that     | available.        |
|         | a |                  | have recently     |                   |
|         | s |                  | been fixed, not   |                   |
|         | o |                  | enough internal   |                   |
|         | f |                  | QC points have    |                   |
|         | t |                  | been generated in |                   |
|         | h |                  | order to know if  |                   |
|         | e |                  | the bias has been |                   |
|         | l |                  | corrected.        |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | m |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | s |                  |                   |                   |
|         | h |                  |                   |                   |
|         | o |                  |                   |                   |
|         | w |                  |                   |                   |
|         | a |                  |                   |                   |
|         | n |                  |                   |                   |
|         | i |                  |                   |                   |
|         | m |                  |                   |                   |
|         | p |                  |                   |                   |
|         | r |                  |                   |                   |
|         | o |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | m |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | e |                  |                   |                   |
|         | g |                  |                   |                   |
|         | a |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | . |                  |                   |                   |
|         | A |                  |                   |                   |
|         | s |                  |                   |                   |
|         | o |                  |                   |                   |
|         | f |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | , |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | u |                  |                   |                   |
|         | l |                  |                   |                   |
|         | t |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | h |                  |                   |                   |
|         | o |                  |                   |                   |
|         | w |                  |                   |                   |
|         | a |                  |                   |                   |
|         | n |                  |                   |                   |
|         | a |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | a |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | e |                  |                   |                   |
|         | g |                  |                   |                   |
|         | a |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | o |                  |                   |                   |
|         | f |                  |                   |                   |
|         | 7 |                  |                   |                   |
|         | . |                  |                   |                   |
|         | 8 |                  |                   |                   |
|         | % |                  |                   |                   |
|         | b |                  |                   |                   |
|         | e |                  |                   |                   |
|         | l |                  |                   |                   |
|         | o |                  |                   |                   |
|         | w |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | v |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | u |                  |                   |                   |
|         | e |                  |                   |                   |
|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | T |                  | New calibration   | The NWQL will     |
|         | h |                  | standards were    | continue to       |
| QADATA  | e |                  | prepared in       | monitor the       |
| Summary | n |                  | September and     | instrument for    |
| October | e |                  | current QC charts | bias.             |
| 2007    | g |                  | indicate that     |                   |
|         | a |                  | bias has been     |                   |
|         | t |                  | fixed.            |                   |
|         | i |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | h |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | c |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | e |                  |                   |                   |
|         | d |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | m |                  |                   |                   |
|         | a |                  |                   |                   |
|         | g |                  |                   |                   |
|         | n |                  |                   |                   |
|         | i |                  |                   |                   |
|         | t |                  |                   |                   |
|         | u |                  |                   |                   |
|         | d |                  |                   |                   |
|         | e |                  |                   |                   |
|         | . |                  |                   |                   |
|         | A |                  |                   |                   |
|         | s |                  |                   |                   |
|         | o |                  |                   |                   |
|         | f |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | l |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | m |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | , |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | u |                  |                   |                   |
|         | l |                  |                   |                   |
|         | t |                  |                   |                   |
|         | s |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | o |                  |                   |                   |
|         | n |                  |                   |                   |
|         | a |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | a |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | 1 |                  |                   |                   |
|         | 3 |                  |                   |                   |
|         | % |                  |                   |                   |
|         | b |                  |                   |                   |
|         | e |                  |                   |                   |
|         | l |                  |                   |                   |
|         | o |                  |                   |                   |
|         | w |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | v |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | u |                  |                   |                   |
|         | e |                  |                   |                   |
|         | , |                  |                   |                   |
|         | a |                  |                   |                   |
|         | n |                  |                   |                   |
|         | d |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | l |                  |                   |                   |
|         | b |                  |                   |                   |
|         | u |                  |                   |                   |
|         | t |                  |                   |                   |
|         | o |                  |                   |                   |
|         | n |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | u |                  |                   |                   |
|         | l |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | s |                  |                   |                   |
|         | l |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | a |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | v |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | u |                  |                   |                   |
|         | e |                  |                   |                   |
|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | A |                  | There was         | We will continue  |
|         | n |                  | improvement at    | to monitor        |
| QADATA  | e |                  | first after new   | mercury closely   |
| Summary | g |                  | standards were    | and check         |
| August  | a |                  | made in early     | reagents and the  |
| 2007    | t |                  | July, but the     | instrument for    |
|         | i |                  | last points show  | problems.         |
|         | v |                  | a downward shift. |                   |
|         | e |                  | On-line QC charts |                   |
|         | b |                  | indicate the bias |                   |
|         | i |                  | is at the higher  |                   |
|         | a |                  | values, but not   |                   |
|         | s |                  | near the low end  |                   |
|         | i |                  | of the curve.     |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | l |                  |                   |                   |
|         | l |                  |                   |                   |
|         | s |                  |                   |                   |
|         | h |                  |                   |                   |
|         | o |                  |                   |                   |
|         | w |                  |                   |                   |
|         | n |                  |                   |                   |
|         | . |                  |                   |                   |
|         | A |                  |                   |                   |
|         | s |                  |                   |                   |
|         | o |                  |                   |                   |
|         | f |                  |                   |                   |
|         | M |                  |                   |                   |
|         | a |                  |                   |                   |
|         | y |                  |                   |                   |
|         | 2 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 7 |                  |                   |                   |
|         | , |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | u |                  |                   |                   |
|         | l |                  |                   |                   |
|         | t |                  |                   |                   |
|         | s |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | o |                  |                   |                   |
|         | n |                  |                   |                   |
|         | a |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | a |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | 1 |                  |                   |                   |
|         | 2 |                  |                   |                   |
|         | % |                  |                   |                   |
|         | b |                  |                   |                   |
|         | e |                  |                   |                   |
|         | l |                  |                   |                   |
|         | o |                  |                   |                   |
|         | w |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | v |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | u |                  |                   |                   |
|         | e |                  |                   |                   |
|         | , |                  |                   |                   |
|         | a |                  |                   |                   |
|         | n |                  |                   |                   |
|         | d |                  |                   |                   |
|         | 2 |                  |                   |                   |
|         | 3 |                  |                   |                   |
|         | o |                  |                   |                   |
|         | u |                  |                   |                   |
|         | t |                  |                   |                   |
|         | o |                  |                   |                   |
|         | f |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | l |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | 2 |                  |                   |                   |
|         | 5 |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | u |                  |                   |                   |
|         | l |                  |                   |                   |
|         | t |                  |                   |                   |
|         | s |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | l |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | a |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | v |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | u |                  |                   |                   |
|         | e |                  |                   |                   |
|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | T |                  | NWQL QC charts    | We will make new  |
|         | h |                  | indicate a        | standards and     |
| QADATA  | e |                  | similar trend.    | will closely      |
| Summary | d |                  |                   | monitor the       |
| June    | a |                  |                   | analysis for      |
| 2007    | t |                  |                   | bias.             |
|         | a |                  |                   |                   |
|         | d |                  |                   |                   |
|         | e |                  |                   |                   |
|         | m |                  |                   |                   |
|         | o |                  |                   |                   |
|         | n |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | r |                  |                   |                   |
|         | a |                  |                   |                   |
|         | t |                  |                   |                   |
|         | e |                  |                   |                   |
|         | a |                  |                   |                   |
|         | d |                  |                   |                   |
|         | o |                  |                   |                   |
|         | w |                  |                   |                   |
|         | n |                  |                   |                   |
|         | w |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | d |                  |                   |                   |
|         | s |                  |                   |                   |
|         | h |                  |                   |                   |
|         | i |                  |                   |                   |
|         | f |                  |                   |                   |
|         | t |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | g |                  |                   |                   |
|         | M |                  |                   |                   |
|         | a |                  |                   |                   |
|         | y |                  |                   |                   |
|         | 2 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 7 |                  |                   |                   |
|         | . |                  |                   |                   |
|         | S |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | c |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | , |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | u |                  |                   |                   |
|         | l |                  |                   |                   |
|         | t |                  |                   |                   |
|         | s |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | o |                  |                   |                   |
|         | n |                  |                   |                   |
|         | a |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | a |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | 1 |                  |                   |                   |
|         | 2 |                  |                   |                   |
|         | % |                  |                   |                   |
|         | b |                  |                   |                   |
|         | e |                  |                   |                   |
|         | l |                  |                   |                   |
|         | o |                  |                   |                   |
|         | w |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | v |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | u |                  |                   |                   |
|         | e |                  |                   |                   |
|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [[]{#n  | * |                  |                   | **The NWQL will   |
| wql2708 | * |                  |                   | continue to       |
| .anc    | S |                  |                   | monitor the       |
| hor}**M | a |                  |                   | instrument for    |
| ercury, | m |                  |                   | bias.**           |
| Un      | p |                  |                   |                   |
| filtere | l |                  |                   |                   |
| d**](ht | e |                  |                   |                   |
| tp://bq | s |                  |                   |                   |
| s.usgs. | a |                  |                   |                   |
| gov/bsp | n |                  |                   |                   |
| /QADATA | a |                  |                   |                   |
| _all/08 | l |                  |                   |                   |
| Feb/Feb | y |                  |                   |                   |
| 08NWQL7 | z |                  |                   |                   |
| 1900CV0 | e |                  |                   |                   |
| 18.gif) | d |                  |                   |                   |
| **CVAF  | a |                  |                   |                   |
| labcode | s |                  |                   |                   |
| 2708    | o |                  |                   |                   |
| p       | f |                  |                   |                   |
| armcode | t |                  |                   |                   |
| 71900   | h |                  |                   |                   |
| CV018** | e |                  |                   |                   |
|         | l |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | m |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | s |                  |                   |                   |
|         | h |                  |                   |                   |
|         | o |                  |                   |                   |
|         | w |                  |                   |                   |
|         | a |                  |                   |                   |
|         | n |                  |                   |                   |
|         | i |                  |                   |                   |
|         | m |                  |                   |                   |
|         | p |                  |                   |                   |
|         | r |                  |                   |                   |
|         | o |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | m |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | e |                  |                   |                   |
|         | g |                  |                   |                   |
|         | a |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | . |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
|         |   |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
|         | A |                  |                   |                   |
|         | n |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | y |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | h |                  |                   |                   |
|         | o |                  |                   |                   |
|         | u |                  |                   |                   |
|         | l |                  |                   |                   |
|         | d |                  |                   |                   |
|         | b |                  |                   |                   |
|         | e |                  |                   |                   |
|         | c |                  |                   |                   |
|         | l |                  |                   |                   |
|         | o |                  |                   |                   |
|         | s |                  |                   |                   |
|         | e |                  |                   |                   |
|         | l |                  |                   |                   |
|         | y |                  |                   |                   |
|         | m |                  |                   |                   |
|         | o |                  |                   |                   |
|         | n |                  |                   |                   |
|         | i |                  |                   |                   |
|         | t |                  |                   |                   |
|         | 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 |                  |                   |                   |
|         | t |                  |                   |                   |
|         | r |                  |                   |                   |
|         | i |                  |                   |                   |
|         | b |                  |                   |                   |
|         | u |                  |                   |                   |
|         | t |                  |                   |                   |
|         | e |                  |                   |                   |
|         | d |                  |                   |                   |
|         | . |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| *P      |   |                  |                   |                   |
| revious |   |                  |                   |                   |
| c       |   |                  |                   |                   |
| omments |   |                  |                   |                   |
| for     |   |                  |                   |                   |
| m       |   |                  |                   |                   |
| ercury, |   |                  |                   |                   |
| unfi    |   |                  |                   |                   |
| ltered, |   |                  |                   |                   |
| labcode |   |                  |                   |                   |
| 2708,   |   |                  |                   |                   |
| p       |   |                  |                   |                   |
| armcode |   |                  |                   |                   |
| 7190    |   |                  |                   |                   |
| 0CV018* |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | A |                  | New calibration   | The NWQL will     |
|         | n |                  | standards were    | continue to       |
| QADATA  | e |                  | prepared in early | monitor the       |
| Summary | g |                  | December;         | instrument for    |
| D       | a |                  | however, due to   | bias as more data |
| ecember | t |                  | instrument        | becomes           |
| 2007    | i |                  | problems that     | available.        |
|         | v |                  | have recently     |                   |
|         | e |                  | been fixed, not   |                   |
|         | b |                  | enough internal   |                   |
|         | i |                  | QC points have    |                   |
|         | a |                  | been generated in |                   |
|         | s |                  | order to know if  |                   |
|         | i |                  | the bias has been |                   |
|         | s |                  | corrected.        |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | l |                  |                   |                   |
|         | l |                  |                   |                   |
|         | s |                  |                   |                   |
|         | h |                  |                   |                   |
|         | o |                  |                   |                   |
|         | w |                  |                   |                   |
|         | n |                  |                   |                   |
|         | . |                  |                   |                   |
|         | A |                  |                   |                   |
|         | s |                  |                   |                   |
|         | o |                  |                   |                   |
|         | f |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | l |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | m |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | , |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | u |                  |                   |                   |
|         | l |                  |                   |                   |
|         | t |                  |                   |                   |
|         | s |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | o |                  |                   |                   |
|         | n |                  |                   |                   |
|         | a |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | a |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | 1 |                  |                   |                   |
|         | 2 |                  |                   |                   |
|         | % |                  |                   |                   |
|         | b |                  |                   |                   |
|         | e |                  |                   |                   |
|         | l |                  |                   |                   |
|         | o |                  |                   |                   |
|         | w |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | v |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | u |                  |                   |                   |
|         | e |                  |                   |                   |
|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | T |                  | New calibration   | The NWQL will     |
|         | h |                  | standards were    | continue to       |
| QADATA  | e |                  | prepared in       | monitor the       |
| Summary | n |                  | September and     | instrument for    |
| October | e |                  | current QC charts | bias.             |
| 2007    | g |                  | indicate that     |                   |
|         | a |                  | bias has been     |                   |
|         | t |                  | fixed.            |                   |
|         | i |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | h |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | c |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | e |                  |                   |                   |
|         | d |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | m |                  |                   |                   |
|         | a |                  |                   |                   |
|         | g |                  |                   |                   |
|         | n |                  |                   |                   |
|         | i |                  |                   |                   |
|         | t |                  |                   |                   |
|         | u |                  |                   |                   |
|         | d |                  |                   |                   |
|         | e |                  |                   |                   |
|         | . |                  |                   |                   |
|         | A |                  |                   |                   |
|         | s |                  |                   |                   |
|         | o |                  |                   |                   |
|         | f |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | l |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | m |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | , |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | u |                  |                   |                   |
|         | l |                  |                   |                   |
|         | t |                  |                   |                   |
|         | s |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | o |                  |                   |                   |
|         | n |                  |                   |                   |
|         | a |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | a |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | 1 |                  |                   |                   |
|         | 1 |                  |                   |                   |
|         | % |                  |                   |                   |
|         | b |                  |                   |                   |
|         | e |                  |                   |                   |
|         | l |                  |                   |                   |
|         | o |                  |                   |                   |
|         | w |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | v |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | u |                  |                   |                   |
|         | e |                  |                   |                   |
|         | , |                  |                   |                   |
|         | a |                  |                   |                   |
|         | n |                  |                   |                   |
|         | d |                  |                   |                   |
|         | m |                  |                   |                   |
|         | o |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | u |                  |                   |                   |
|         | l |                  |                   |                   |
|         | t |                  |                   |                   |
|         | s |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | l |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | a |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | v |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | u |                  |                   |                   |
|         | e |                  |                   |                   |
|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | T |                  | The most recent   | We will continue  |
|         | h |                  | points show       | to monitor        |
| QADATA  | e |                  | improvement.      | mercury closely.  |
| Summary | d |                  |                   |                   |
| August  | a |                  |                   |                   |
| 2007    | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | e |                  |                   |                   |
|         | x |                  |                   |                   |
|         | h |                  |                   |                   |
|         | i |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | n |                  |                   |                   |
|         | e |                  |                   |                   |
|         | g |                  |                   |                   |
|         | a |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | g |                  |                   |                   |
|         | m |                  |                   |                   |
|         | i |                  |                   |                   |
|         | d |                  |                   |                   |
|         | M |                  |                   |                   |
|         | a |                  |                   |                   |
|         | y |                  |                   |                   |
|         | 2 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 7 |                  |                   |                   |
|         | . |                  |                   |                   |
|         | S |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | c |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | , |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | u |                  |                   |                   |
|         | l |                  |                   |                   |
|         | t |                  |                   |                   |
|         | s |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | o |                  |                   |                   |
|         | n |                  |                   |                   |
|         | a |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | a |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | 6 |                  |                   |                   |
|         | . |                  |                   |                   |
|         | 2 |                  |                   |                   |
|         | % |                  |                   |                   |
|         | b |                  |                   |                   |
|         | e |                  |                   |                   |
|         | l |                  |                   |                   |
|         | o |                  |                   |                   |
|         | w |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | v |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | u |                  |                   |                   |
|         | e |                  |                   |                   |
|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [[]{#n  |   | **High           | **We are seeing   | **We will monitor |
| wql3134 |   | variability and  | this with our     | the instrument    |
| .anch   |   | a positive bias  | blanks as well.   | closely after the |
| or}**Va |   | are shown for    | We believe that   | maintenance and   |
| nadium, |   | blind blanks.    | the variability   | take appropriate  |
| Unfil   |   | Since November   | is instrumental   | steps based on    |
| tered** |   | 2007, 63% of the | and have          | the information   |
| ](http: |   | blind-blank      | contacted the     | gathered at that  |
| //bqs.u |   | results are      | manufacturer to   | time.**           |
| sgs.gov |   | greater than the | have maintenance  |                   |
| /bsp/QA |   | IRL.**           | performed. If the |                   |
| DATA_al |   |                  | variability is    |                   |
| l/08Feb |   |                  | related to the    |                   |
| /Feb08B |   |                  | instrument aging, |                   |
| BPNWQL0 |   |                  | we may need to    |                   |
| 1087PLM |   |                  | raise the IRL for |                   |
| 10.xls) |   |                  | this element.**   |                   |
| **      |   |                  |                   |                   |
| cICP-MS |   |                  | []{.mark}         |                   |
| labcode |   |                  |                   |                   |
| 3135    |   |                  |                   |                   |
| p       |   |                  |                   |                   |
| armcode |   |                  |                   |                   |
| 01087   |   |                  |                   |                   |
| PLM10** |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [[]{#n  |   | **The positive   | **We have looked  | **It will take    |
| wql3138 |   | bias continues   | at a number of    | 2-3 more weeks of |
| .       |   | to increase.     | possible causes,  | data to ensure    |
| anchor} |   | Since the last   | but none of the   | that this         |
| **Zinc, |   | assessment,      | attempted         | solution is       |
| Filtere |   | almost half of   | corrections has   | working. We will  |
| d**](ht |   | the results are  | been proven to    | continue to       |
| tp://bq |   | outside of       | correct the issue | monitor this line |
| s.usgs. |   | control limits   | yet. The most     | closely and if    |
| gov/bsp |   | and the overall  | recent            | the line is still |
| /QADATA |   | bias is 21%.**   | modification to   | having problems   |
| _all/08 |   |                  | the calibration   | we will request   |
| Feb/Feb |   | **Results for    | procedure is      | input from the    |
| 08NWQL0 |   | unfiltered zinc  | showing promise,  | Quality Assurance |
| 1090PLM |   | by cICP-MS ([pc  | but we want to    | Section of the    |
| 10.gif) |   | 1092PLM10)](h    | see more data to  | NWQL on March 11, |
| **      |   | ttp://bqs.usgs.g | be sure.**        | 2008.**           |
| cICP-MS |   | ov/bsp/QADATA_al |                   |                   |
| labcode |   | l/08Feb/Feb08NWQ |                   |                   |
| 3138    |   | L01092PLM10.gif) |                   |                   |
| p       |   | are not          |                   |                   |
| armcode |   | exhibiting this  |                   |                   |
| 01090   |   | bias or          |                   |                   |
| PLM10** |   | variability.**   |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| *P      |   |                  |                   |                   |
| revious |   |                  |                   |                   |
| c       |   |                  |                   |                   |
| omments |   |                  |                   |                   |
| for     |   |                  |                   |                   |
| zinc,   |   |                  |                   |                   |
| fi      |   |                  |                   |                   |
| ltered, |   |                  |                   |                   |
| labcode |   |                  |                   |                   |
| 3138,   |   |                  |                   |                   |
| p       |   |                  |                   |                   |
| armcode |   |                  |                   |                   |
| 0109    |   |                  |                   |                   |
| 0PLM10* |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | T |                  | On-line QC charts | The NWQL will     |
|         | h |                  | indicate the bias | continue to       |
| QADATA  | e |                  | does not appear   | monitor the       |
| Summary | p |                  | to be related to  | instrument for    |
| D       | o |                  | standards. The    | bias.             |
| ecember | s |                  | bias also does    |                   |
| 2007    | i |                  | not seem to be    |                   |
|         | t |                  | related to        |                   |
|         | i |                  | carry-over or     |                   |
|         | v |                  | contamination.    |                   |
|         | e |                  | The analyst is    |                   |
|         | b |                  | investigating the |                   |
|         | i |                  | possibility of    |                   |
|         | a |                  | interference,     |                   |
|         | s |                  | however, the      |                   |
|         | d |                  | instrument is     |                   |
|         | i |                  | currently         |                   |
|         | s |                  | undergoing        |                   |
|         | p |                  | repair. More      |                   |
|         | l |                  | research needs to |                   |
|         | a |                  | be conducted as   |                   |
|         | y |                  | soon as the       |                   |
|         | e |                  | instrument is     |                   |
|         | d |                  | operational       |                   |
|         | s |                  | again.            |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | c |                  |                   |                   |
|         | e |                  |                   |                   |
|         | J |                  |                   |                   |
|         | a |                  |                   |                   |
|         | n |                  |                   |                   |
|         | u |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | y |                  |                   |                   |
|         | 2 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 7 |                  |                   |                   |
|         | h |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | c |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | e |                  |                   |                   |
|         | d |                  |                   |                   |
|         | e |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | m |                  |                   |                   |
|         | o |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | c |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | l |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | m |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | . |                  |                   |                   |
|         | T |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | m |                  |                   |                   |
|         | o |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | c |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | d |                  |                   |                   |
|         | a |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | h |                  |                   |                   |
|         | o |                  |                   |                   |
|         | w |                  |                   |                   |
|         | a |                  |                   |                   |
|         | p |                  |                   |                   |
|         | o |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | g |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | a |                  |                   |                   |
|         | t |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | a |                  |                   |                   |
|         | n |                  |                   |                   |
|         | 1 |                  |                   |                   |
|         | 3 |                  |                   |                   |
|         | % |                  |                   |                   |
|         | , |                  |                   |                   |
|         | a |                  |                   |                   |
|         | n |                  |                   |                   |
|         | d |                  |                   |                   |
|         | o |                  |                   |                   |
|         | n |                  |                   |                   |
|         | e |                  |                   |                   |
|         | o |                  |                   |                   |
|         | u |                  |                   |                   |
|         | t |                  |                   |                   |
|         | o |                  |                   |                   |
|         | f |                  |                   |                   |
|         | e |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | y |                  |                   |                   |
|         | f |                  |                   |                   |
|         | o |                  |                   |                   |
|         | u |                  |                   |                   |
|         | r |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | u |                  |                   |                   |
|         | l |                  |                   |                   |
|         | t |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | s |                  |                   |                   |
|         | o |                  |                   |                   |
|         | u |                  |                   |                   |
|         | t |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | d |                  |                   |                   |
|         | e |                  |                   |                   |
|         | o |                  |                   |                   |
|         | f |                  |                   |                   |
|         | c |                  |                   |                   |
|         | o |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | r |                  |                   |                   |
|         | o |                  |                   |                   |
|         | l |                  |                   |                   |
|         | l |                  |                   |                   |
|         | i |                  |                   |                   |
|         | m |                  |                   |                   |
|         | i |                  |                   |                   |
|         | t |                  |                   |                   |
|         | s |                  |                   |                   |
|         | . |                  |                   |                   |
|         |   |                  |                   |                   |
|         | R |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | u |                  |                   |                   |
|         | l |                  |                   |                   |
|         | t |                  |                   |                   |
|         | s |                  |                   |                   |
|         | f |                  |                   |                   |
|         | o |                  |                   |                   |
|         | r |                  |                   |                   |
|         | u |                  |                   |                   |
|         | n |                  |                   |                   |
|         | f |                  |                   |                   |
|         | i |                  |                   |                   |
|         | l |                  |                   |                   |
|         | t |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | d |                  |                   |                   |
|         | z |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | c |                  |                   |                   |
|         | b |                  |                   |                   |
|         | y |                  |                   |                   |
|         | c |                  |                   |                   |
|         | I |                  |                   |                   |
|         | C |                  |                   |                   |
|         | P |                  |                   |                   |
|         | - |                  |                   |                   |
|         | M |                  |                   |                   |
|         | S |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | o |                  |                   |                   |
|         | t |                  |                   |                   |
|         | e |                  |                   |                   |
|         | x |                  |                   |                   |
|         | h |                  |                   |                   |
|         | i |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | g |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | i |                  |                   |                   |
|         | s |                  |                   |                   |
|         | p |                  |                   |                   |
|         | r |                  |                   |                   |
|         | o |                  |                   |                   |
|         | b |                  |                   |                   |
|         | l |                  |                   |                   |
|         | e |                  |                   |                   |
|         | m |                  |                   |                   |
|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | T |                  | On-line QC was    | The NWQL will     |
|         | h |                  | showing no bias   | make new          |
| >       | i |                  | so the analyst    | calibration and   |
|  QADATA | s |                  | purchased another | check standards   |
| >       | a |                  | standard from a   | from new stock    |
| Summary | n |                  | different source. | solutions.        |
| >       | a |                  | Initial analyses  |                   |
| October | l |                  | show a bias       |                   |
| > 2007  | y |                  | similar to the    |                   |
|         | t |                  | one on the BQS    |                   |
|         | i |                  | charts.           |                   |
|         | c |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | l |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | e |                  |                   |                   |
|         | h |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | h |                  |                   |                   |
|         | o |                  |                   |                   |
|         | w |                  |                   |                   |
|         | n |                  |                   |                   |
|         | a |                  |                   |                   |
|         | p |                  |                   |                   |
|         | o |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | c |                  |                   |                   |
|         | e |                  |                   |                   |
|         | J |                  |                   |                   |
|         | a |                  |                   |                   |
|         | n |                  |                   |                   |
|         | u |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | y |                  |                   |                   |
|         | 2 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 7 |                  |                   |                   |
|         | . |                  |                   |                   |
|         | A |                  |                   |                   |
|         | s |                  |                   |                   |
|         | o |                  |                   |                   |
|         | f |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | , |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | u |                  |                   |                   |
|         | l |                  |                   |                   |
|         | t |                  |                   |                   |
|         | s |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | o |                  |                   |                   |
|         | n |                  |                   |                   |
|         | a |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | a |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | 1 |                  |                   |                   |
|         | 3 |                  |                   |                   |
|         | % |                  |                   |                   |
|         | a |                  |                   |                   |
|         | b |                  |                   |                   |
|         | o |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | v |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | u |                  |                   |                   |
|         | e |                  |                   |                   |
|         | , |                  |                   |                   |
|         | a |                  |                   |                   |
|         | n |                  |                   |                   |
|         | d |                  |                   |                   |
|         | 8 |                  |                   |                   |
|         | 9 |                  |                   |                   |
|         | o |                  |                   |                   |
|         | f |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | 9 |                  |                   |                   |
|         | 5 |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | u |                  |                   |                   |
|         | l |                  |                   |                   |
|         | t |                  |                   |                   |
|         | s |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | g |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | a |                  |                   |                   |
|         | t |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | a |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | v |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | u |                  |                   |                   |
|         | e |                  |                   |                   |
|         | . |                  |                   |                   |
|         |   |                  |                   |                   |
|         | R |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | u |                  |                   |                   |
|         | l |                  |                   |                   |
|         | t |                  |                   |                   |
|         | s |                  |                   |                   |
|         | f |                  |                   |                   |
|         | o |                  |                   |                   |
|         | r |                  |                   |                   |
|         | u |                  |                   |                   |
|         | n |                  |                   |                   |
|         | f |                  |                   |                   |
|         | i |                  |                   |                   |
|         | l |                  |                   |                   |
|         | t |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | d |                  |                   |                   |
|         | z |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | c |                  |                   |                   |
|         | b |                  |                   |                   |
|         | y |                  |                   |                   |
|         | c |                  |                   |                   |
|         | I |                  |                   |                   |
|         | C |                  |                   |                   |
|         | P |                  |                   |                   |
|         | - |                  |                   |                   |
|         | M |                  |                   |                   |
|         | S |                  |                   |                   |
|         | ( |                  |                   |                   |
|         | [ |                  |                   |                   |
|         | p |                  |                   |                   |
|         | c |                  |                   |                   |
|         | 1 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 9 |                  |                   |                   |
|         | 2 |                  |                   |                   |
|         | P |                  |                   |                   |
|         | L |                  |                   |                   |
|         | M |                  |                   |                   |
|         | 1 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | ) |                  |                   |                   |
|         | ] |                  |                   |                   |
|         | ( |                  |                   |                   |
|         | h |                  |                   |                   |
|         | t |                  |                   |                   |
|         | t |                  |                   |                   |
|         | p |                  |                   |                   |
|         | : |                  |                   |                   |
|         | / |                  |                   |                   |
|         | / |                  |                   |                   |
|         | b |                  |                   |                   |
|         | q |                  |                   |                   |
|         | s |                  |                   |                   |
|         | . |                  |                   |                   |
|         | u |                  |                   |                   |
|         | s |                  |                   |                   |
|         | g |                  |                   |                   |
|         | s |                  |                   |                   |
|         | . |                  |                   |                   |
|         | g |                  |                   |                   |
|         | o |                  |                   |                   |
|         | v |                  |                   |                   |
|         | / |                  |                   |                   |
|         | b |                  |                   |                   |
|         | s |                  |                   |                   |
|         | p |                  |                   |                   |
|         | / |                  |                   |                   |
|         | Q |                  |                   |                   |
|         | A |                  |                   |                   |
|         | D |                  |                   |                   |
|         | A |                  |                   |                   |
|         | T |                  |                   |                   |
|         | A |                  |                   |                   |
|         | _ |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | l |                  |                   |                   |
|         | / |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 7 |                  |                   |                   |
|         | O |                  |                   |                   |
|         | c |                  |                   |                   |
|         | t |                  |                   |                   |
|         | / |                  |                   |                   |
|         | O |                  |                   |                   |
|         | c |                  |                   |                   |
|         | t |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 7 |                  |                   |                   |
|         | N |                  |                   |                   |
|         | W |                  |                   |                   |
|         | Q |                  |                   |                   |
|         | L |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 1 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 9 |                  |                   |                   |
|         | 2 |                  |                   |                   |
|         | E |                  |                   |                   |
|         | . |                  |                   |                   |
|         | g |                  |                   |                   |
|         | i |                  |                   |                   |
|         | f |                  |                   |                   |
|         | ) |                  |                   |                   |
|         | c |                  |                   |                   |
|         | o |                  |                   |                   |
|         | m |                  |                   |                   |
|         | e |                  |                   |                   |
|         | f |                  |                   |                   |
|         | r |                  |                   |                   |
|         | o |                  |                   |                   |
|         | m |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | a |                  |                   |                   |
|         | m |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | f |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | c |                  |                   |                   |
|         | e |                  |                   |                   |
|         | m |                  |                   |                   |
|         | a |                  |                   |                   |
|         | t |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | s |                  |                   |                   |
|         | b |                  |                   |                   |
|         | u |                  |                   |                   |
|         | t |                  |                   |                   |
|         | d |                  |                   |                   |
|         | o |                  |                   |                   |
|         | n |                  |                   |                   |
|         | o |                  |                   |                   |
|         | t |                  |                   |                   |
|         | e |                  |                   |                   |
|         | x |                  |                   |                   |
|         | h |                  |                   |                   |
|         | i |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | t |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | i |                  |                   |                   |
|         | s |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | A |                  | On-line QC charts | We will monitor   |
|         | l |                  | indicate an equal | the line to see   |
| >       | t |                  | number of points  | if new results    |
|  QADATA | h |                  | above and below   | continue to       |
| >       | o |                  | the MPV at 10 and | improve the       |
| Summary | u |                  | 100 ug/L. At 10   | charts.           |
| >       | g |                  | ug/L there is a   |                   |
|  August | h |                  | difference        |                   |
| > 2007  | t |                  | between the 2     |                   |
|         | h |                  | instruments with  |                   |
|         | e |                  | one trending high |                   |
|         | r |                  | and one trending  |                   |
|         | e |                  | low.              |                   |
|         | i |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | o |                  |                   |                   |
|         | m |                  |                   |                   |
|         | e |                  |                   |                   |
|         | i |                  |                   |                   |
|         | m |                  |                   |                   |
|         | p |                  |                   |                   |
|         | r |                  |                   |                   |
|         | o |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | m |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | , |                  |                   |                   |
|         | a |                  |                   |                   |
|         | p |                  |                   |                   |
|         | o |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | l |                  |                   |                   |
|         | l |                  |                   |                   |
|         | p |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | . |                  |                   |                   |
|         | R |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | u |                  |                   |                   |
|         | l |                  |                   |                   |
|         | t |                  |                   |                   |
|         | s |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | c |                  |                   |                   |
|         | e |                  |                   |                   |
|         | i |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | d |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | c |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | l |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | m |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | o |                  |                   |                   |
|         | n |                  |                   |                   |
|         | a |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | a |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | 1 |                  |                   |                   |
|         | 4 |                  |                   |                   |
|         | % |                  |                   |                   |
|         | a |                  |                   |                   |
|         | b |                  |                   |                   |
|         | o |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | v |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | u |                  |                   |                   |
|         | e |                  |                   |                   |
|         | w |                  |                   |                   |
|         | i |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | m |                  |                   |                   |
|         | o |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | u |                  |                   |                   |
|         | l |                  |                   |                   |
|         | t |                  |                   |                   |
|         | s |                  |                   |                   |
|         | g |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | a |                  |                   |                   |
|         | t |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | a |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | v |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | u |                  |                   |                   |
|         | e |                  |                   |                   |
|         | . |                  |                   |                   |
|         |   |                  |                   |                   |
|         | A |                  |                   |                   |
|         | p |                  |                   |                   |
|         | o |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | s |                  |                   |                   |
|         | n |                  |                   |                   |
|         | o |                  |                   |                   |
|         | t |                  |                   |                   |
|         | e |                  |                   |                   |
|         | v |                  |                   |                   |
|         | i |                  |                   |                   |
|         | d |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | f |                  |                   |                   |
|         | o |                  |                   |                   |
|         | r |                  |                   |                   |
|         | u |                  |                   |                   |
|         | n |                  |                   |                   |
|         | f |                  |                   |                   |
|         | i |                  |                   |                   |
|         | l |                  |                   |                   |
|         | t |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | d |                  |                   |                   |
|         | z |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | c |                  |                   |                   |
|         | b |                  |                   |                   |
|         | y |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | n |                  |                   |                   |
|         | d |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | d |                  |                   |                   |
|         | I |                  |                   |                   |
|         | C |                  |                   |                   |
|         | P |                  |                   |                   |
|         | - |                  |                   |                   |
|         | M |                  |                   |                   |
|         | S |                  |                   |                   |
|         | ( |                  |                   |                   |
|         | [ |                  |                   |                   |
|         | p |                  |                   |                   |
|         | c |                  |                   |                   |
|         | 1 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 9 |                  |                   |                   |
|         | 2 |                  |                   |                   |
|         | ] |                  |                   |                   |
|         | ( |                  |                   |                   |
|         | h |                  |                   |                   |
|         | t |                  |                   |                   |
|         | t |                  |                   |                   |
|         | p |                  |                   |                   |
|         | : |                  |                   |                   |
|         | / |                  |                   |                   |
|         | / |                  |                   |                   |
|         | b |                  |                   |                   |
|         | q |                  |                   |                   |
|         | s |                  |                   |                   |
|         | . |                  |                   |                   |
|         | u |                  |                   |                   |
|         | s |                  |                   |                   |
|         | g |                  |                   |                   |
|         | s |                  |                   |                   |
|         | . |                  |                   |                   |
|         | g |                  |                   |                   |
|         | o |                  |                   |                   |
|         | v |                  |                   |                   |
|         | / |                  |                   |                   |
|         | b |                  |                   |                   |
|         | s |                  |                   |                   |
|         | p |                  |                   |                   |
|         | / |                  |                   |                   |
|         | Q |                  |                   |                   |
|         | A |                  |                   |                   |
|         | D |                  |                   |                   |
|         | A |                  |                   |                   |
|         | T |                  |                   |                   |
|         | A |                  |                   |                   |
|         | _ |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | l |                  |                   |                   |
|         | / |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 7 |                  |                   |                   |
|         | A |                  |                   |                   |
|         | u |                  |                   |                   |
|         | g |                  |                   |                   |
|         | / |                  |                   |                   |
|         | A |                  |                   |                   |
|         | u |                  |                   |                   |
|         | g |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 7 |                  |                   |                   |
|         | N |                  |                   |                   |
|         | W |                  |                   |                   |
|         | Q |                  |                   |                   |
|         | L |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 1 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 9 |                  |                   |                   |
|         | 2 |                  |                   |                   |
|         | D |                  |                   |                   |
|         | . |                  |                   |                   |
|         | g |                  |                   |                   |
|         | i |                  |                   |                   |
|         | f |                  |                   |                   |
|         | ) |                  |                   |                   |
|         | [ |                  |                   |                   |
|         | P |                  |                   |                   |
|         | L |                  |                   |                   |
|         | M |                  |                   |                   |
|         | 4 |                  |                   |                   |
|         | 8 |                  |                   |                   |
|         | ] |                  |                   |                   |
|         | { |                  |                   |                   |
|         | . |                  |                   |                   |
|         | u |                  |                   |                   |
|         | n |                  |                   |                   |
|         | d |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | l |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | e |                  |                   |                   |
|         | } |                  |                   |                   |
|         | ) |                  |                   |                   |
|         | o |                  |                   |                   |
|         | r |                  |                   |                   |
|         | b |                  |                   |                   |
|         | y |                  |                   |                   |
|         | c |                  |                   |                   |
|         | I |                  |                   |                   |
|         | C |                  |                   |                   |
|         | P |                  |                   |                   |
|         | - |                  |                   |                   |
|         | M |                  |                   |                   |
|         | S |                  |                   |                   |
|         | ( |                  |                   |                   |
|         | [ |                  |                   |                   |
|         | p |                  |                   |                   |
|         | c |                  |                   |                   |
|         | 1 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 9 |                  |                   |                   |
|         | 2 |                  |                   |                   |
|         | P |                  |                   |                   |
|         | L |                  |                   |                   |
|         | M |                  |                   |                   |
|         | 1 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | ) |                  |                   |                   |
|         | ] |                  |                   |                   |
|         | ( |                  |                   |                   |
|         | h |                  |                   |                   |
|         | t |                  |                   |                   |
|         | t |                  |                   |                   |
|         | p |                  |                   |                   |
|         | : |                  |                   |                   |
|         | / |                  |                   |                   |
|         | / |                  |                   |                   |
|         | b |                  |                   |                   |
|         | q |                  |                   |                   |
|         | s |                  |                   |                   |
|         | . |                  |                   |                   |
|         | u |                  |                   |                   |
|         | s |                  |                   |                   |
|         | g |                  |                   |                   |
|         | s |                  |                   |                   |
|         | . |                  |                   |                   |
|         | g |                  |                   |                   |
|         | o |                  |                   |                   |
|         | v |                  |                   |                   |
|         | / |                  |                   |                   |
|         | b |                  |                   |                   |
|         | s |                  |                   |                   |
|         | p |                  |                   |                   |
|         | / |                  |                   |                   |
|         | Q |                  |                   |                   |
|         | A |                  |                   |                   |
|         | D |                  |                   |                   |
|         | A |                  |                   |                   |
|         | T |                  |                   |                   |
|         | A |                  |                   |                   |
|         | _ |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | l |                  |                   |                   |
|         | / |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 7 |                  |                   |                   |
|         | A |                  |                   |                   |
|         | u |                  |                   |                   |
|         | g |                  |                   |                   |
|         | / |                  |                   |                   |
|         | A |                  |                   |                   |
|         | u |                  |                   |                   |
|         | g |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 7 |                  |                   |                   |
|         | N |                  |                   |                   |
|         | W |                  |                   |                   |
|         | Q |                  |                   |                   |
|         | L |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 1 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 9 |                  |                   |                   |
|         | 2 |                  |                   |                   |
|         | E |                  |                   |                   |
|         | . |                  |                   |                   |
|         | g |                  |                   |                   |
|         | i |                  |                   |                   |
|         | f |                  |                   |                   |
|         | ) |                  |                   |                   |
|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | T |                  |                   | We are making new |
|         | h |                  |                   | standards and we  |
| >       | e |                  |                   | will continue to  |
|  QADATA | p |                  |                   | closely monitor   |
| >       | o |                  |                   | the analysis for  |
| Summary | s |                  |                   | bias.             |
| > June  | i |                  |                   |                   |
| > 2007  | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | c |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | g |                  |                   |                   |
|         | . |                  |                   |                   |
|         | R |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | u |                  |                   |                   |
|         | l |                  |                   |                   |
|         | t |                  |                   |                   |
|         | s |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | c |                  |                   |                   |
|         | e |                  |                   |                   |
|         | i |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | d |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | c |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | l |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | m |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | o |                  |                   |                   |
|         | n |                  |                   |                   |
|         | a |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | a |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | 1 |                  |                   |                   |
|         | 8 |                  |                   |                   |
|         | % |                  |                   |                   |
|         | a |                  |                   |                   |
|         | b |                  |                   |                   |
|         | o |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | v |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | u |                  |                   |                   |
|         | e |                  |                   |                   |
|         | w |                  |                   |                   |
|         | i |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | e |                  |                   |                   |
|         | o |                  |                   |                   |
|         | u |                  |                   |                   |
|         | t |                  |                   |                   |
|         | o |                  |                   |                   |
|         | f |                  |                   |                   |
|         | 2 |                  |                   |                   |
|         | 2 |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | u |                  |                   |                   |
|         | l |                  |                   |                   |
|         | t |                  |                   |                   |
|         | s |                  |                   |                   |
|         | ( |                  |                   |                   |
|         | 1 |                  |                   |                   |
|         | 4 |                  |                   |                   |
|         | % |                  |                   |                   |
|         | ) |                  |                   |                   |
|         | o |                  |                   |                   |
|         | u |                  |                   |                   |
|         | t |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | d |                  |                   |                   |
|         | e |                  |                   |                   |
|         | o |                  |                   |                   |
|         | f |                  |                   |                   |
|         | + |                  |                   |                   |
|         | / |                  |                   |                   |
|         | - |                  |                   |                   |
|         | 2 |                  |                   |                   |
|         | f |                  |                   |                   |
|         | - |                  |                   |                   |
|         | p |                  |                   |                   |
|         | s |                  |                   |                   |
|         | e |                  |                   |                   |
|         | u |                  |                   |                   |
|         | d |                  |                   |                   |
|         | o |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | g |                  |                   |                   |
|         | m |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | . |                  |                   |                   |
|         |   |                  |                   |                   |
|         | A |                  |                   |                   |
|         | p |                  |                   |                   |
|         | o |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | s |                  |                   |                   |
|         | n |                  |                   |                   |
|         | o |                  |                   |                   |
|         | t |                  |                   |                   |
|         | e |                  |                   |                   |
|         | v |                  |                   |                   |
|         | i |                  |                   |                   |
|         | d |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | f |                  |                   |                   |
|         | o |                  |                   |                   |
|         | r |                  |                   |                   |
|         | u |                  |                   |                   |
|         | n |                  |                   |                   |
|         | f |                  |                   |                   |
|         | i |                  |                   |                   |
|         | l |                  |                   |                   |
|         | t |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | d |                  |                   |                   |
|         | z |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | c |                  |                   |                   |
|         | b |                  |                   |                   |
|         | y |                  |                   |                   |
|         | c |                  |                   |                   |
|         | I |                  |                   |                   |
|         | C |                  |                   |                   |
|         | P |                  |                   |                   |
|         | - |                  |                   |                   |
|         | M |                  |                   |                   |
|         | S |                  |                   |                   |
|         | ( |                  |                   |                   |
|         | [ |                  |                   |                   |
|         | p |                  |                   |                   |
|         | c |                  |                   |                   |
|         | 1 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 9 |                  |                   |                   |
|         | 2 |                  |                   |                   |
|         | E |                  |                   |                   |
|         | ] |                  |                   |                   |
|         | ( |                  |                   |                   |
|         | h |                  |                   |                   |
|         | t |                  |                   |                   |
|         | t |                  |                   |                   |
|         | p |                  |                   |                   |
|         | : |                  |                   |                   |
|         | / |                  |                   |                   |
|         | / |                  |                   |                   |
|         | b |                  |                   |                   |
|         | q |                  |                   |                   |
|         | s |                  |                   |                   |
|         | . |                  |                   |                   |
|         | u |                  |                   |                   |
|         | s |                  |                   |                   |
|         | g |                  |                   |                   |
|         | s |                  |                   |                   |
|         | . |                  |                   |                   |
|         | g |                  |                   |                   |
|         | o |                  |                   |                   |
|         | v |                  |                   |                   |
|         | / |                  |                   |                   |
|         | b |                  |                   |                   |
|         | s |                  |                   |                   |
|         | p |                  |                   |                   |
|         | / |                  |                   |                   |
|         | Q |                  |                   |                   |
|         | A |                  |                   |                   |
|         | D |                  |                   |                   |
|         | A |                  |                   |                   |
|         | T |                  |                   |                   |
|         | A |                  |                   |                   |
|         | _ |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | l |                  |                   |                   |
|         | / |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 7 |                  |                   |                   |
|         | J |                  |                   |                   |
|         | u |                  |                   |                   |
|         | n |                  |                   |                   |
|         | / |                  |                   |                   |
|         | J |                  |                   |                   |
|         | u |                  |                   |                   |
|         | n |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 7 |                  |                   |                   |
|         | N |                  |                   |                   |
|         | W |                  |                   |                   |
|         | Q |                  |                   |                   |
|         | L |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 1 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 9 |                  |                   |                   |
|         | 2 |                  |                   |                   |
|         | E |                  |                   |                   |
|         | . |                  |                   |                   |
|         | g |                  |                   |                   |
|         | i |                  |                   |                   |
|         | f |                  |                   |                   |
|         | ) |                  |                   |                   |
|         | ) |                  |                   |                   |
|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | T |                  | NWQL QC charts    | We will continue  |
|         | h |                  | indicated a       | to closely        |
| >       | e |                  | similar bias and  | monitor the       |
|  QADATA | d |                  | new calibration   | analysis for      |
| >       | a |                  | standards were    | bias.             |
| Summary | t |                  | prepared in the   |                   |
| > April | a |                  | end of March      |                   |
| > 2007  | d |                  | 2007. We are      |                   |
|         | e |                  | still gathering   |                   |
|         | m |                  | data to see if    |                   |
|         | o |                  | the bias has      |                   |
|         | n |                  | improved.         |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | r |                  |                   |                   |
|         | a |                  |                   |                   |
|         | t |                  |                   |                   |
|         | e |                  |                   |                   |
|         | a |                  |                   |                   |
|         | p |                  |                   |                   |
|         | o |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | . |                  |                   |                   |
|         | A |                  |                   |                   |
|         | s |                  |                   |                   |
|         | o |                  |                   |                   |
|         | f |                  |                   |                   |
|         | J |                  |                   |                   |
|         | a |                  |                   |                   |
|         | n |                  |                   |                   |
|         | u |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | y |                  |                   |                   |
|         | 2 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 7 |                  |                   |                   |
|         | , |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | u |                  |                   |                   |
|         | l |                  |                   |                   |
|         | t |                  |                   |                   |
|         | s |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | o |                  |                   |                   |
|         | n |                  |                   |                   |
|         | a |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | a |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | 1 |                  |                   |                   |
|         | 1 |                  |                   |                   |
|         | % |                  |                   |                   |
|         | a |                  |                   |                   |
|         | b |                  |                   |                   |
|         | o |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | v |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | u |                  |                   |                   |
|         | e |                  |                   |                   |
|         | , |                  |                   |                   |
|         | a |                  |                   |                   |
|         | n |                  |                   |                   |
|         | d |                  |                   |                   |
|         | m |                  |                   |                   |
|         | o |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | u |                  |                   |                   |
|         | l |                  |                   |                   |
|         | t |                  |                   |                   |
|         | s |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | g |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | a |                  |                   |                   |
|         | t |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | a |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | v |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | u |                  |                   |                   |
|         | e |                  |                   |                   |
|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+

+---------+---+------------------+-------------------+-------------------+
| **Major | * |                  | **NWQL Comment**  | **Corrective      |
| De      | * |                  |                   | Action**          |
| termina | P |                  |                   |                   |
| tions** | r |                  |                   |                   |
|         | o |                  |                   |                   |
|         | b |                  |                   |                   |
|         | l |                  |                   |                   |
|         | e |                  |                   |                   |
|         | m |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+=========+===+==================+===================+===================+
| [**Fl   | * |                  | **The electrodes  | **New electrodes  |
| uoride, | * |                  | (ISE and          | are being         |
| Filtere | A |                  | reference) on the | conditioned this  |
| d**](ht | p |                  | system typically  | week and will be  |
| tp://bq | o |                  | need to be        | used on the line  |
| s.usgs. | s |                  | replaced on a 5-6 | when they are     |
| gov/bsp | i |                  | month schedule.   | ready for use.    |
| /QADATA | t |                  | The analyst       | This should lower |
| _all/08 | i |                  | continued to use  | the observed      |
| Feb/Feb | v |                  | the old           | bias.**           |
| 08NWQL0 | e |                  | electrodes while  |                   |
| 0950ISE | b |                  | analyzing some    |                   |
| 05.gif) | i |                  | difficult samples |                   |
| **ISE   | a |                  | that arrived in   |                   |
| labcode | s |                  | December in order |                   |
| 0031    | i |                  | to not            |                   |
| p       | s |                  | potentially ruin  |                   |
| armcode | s |                  | new electrodes    |                   |
| 0950    | h |                  | that are very     |                   |
| ISE05** | o |                  | expensive.**      |                   |
|         | w |                  |                   |                   |
|         | n |                  |                   |                   |
|         | f |                  |                   |                   |
|         | o |                  |                   |                   |
|         | r |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | m |                  |                   |                   |
|         | o |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | c |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | d |                  |                   |                   |
|         | a |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | . |                  |                   |                   |
|         | A |                  |                   |                   |
|         | s |                  |                   |                   |
|         | o |                  |                   |                   |
|         | f |                  |                   |                   |
|         | m |                  |                   |                   |
|         | i |                  |                   |                   |
|         | d |                  |                   |                   |
|         | D |                  |                   |                   |
|         | e |                  |                   |                   |
|         | c |                  |                   |                   |
|         | e |                  |                   |                   |
|         | m |                  |                   |                   |
|         | b |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | 2 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 7 |                  |                   |                   |
|         | , |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | s |                  |                   |                   |
|         | a |                  |                   |                   |
|         | b |                  |                   |                   |
|         | o |                  |                   |                   |
|         | u |                  |                   |                   |
|         | t |                  |                   |                   |
|         | 1 |                  |                   |                   |
|         | 6 |                  |                   |                   |
|         | % |                  |                   |                   |
|         | , |                  |                   |                   |
|         | o |                  |                   |                   |
|         | n |                  |                   |                   |
|         | a |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | a |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | , |                  |                   |                   |
|         | a |                  |                   |                   |
|         | b |                  |                   |                   |
|         | o |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | v |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | u |                  |                   |                   |
|         | e |                  |                   |                   |
|         | . |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
|         |   |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
|         | N |                  |                   |                   |
|         | o |                  |                   |                   |
|         | t |                  |                   |                   |
|         | e |                  |                   |                   |
|         | : |                  |                   |                   |
|         | T |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | c |                  |                   |                   |
|         | o |                  |                   |                   |
|         | n |                  |                   |                   |
|         | c |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | r |                  |                   |                   |
|         | a |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | o |                  |                   |                   |
|         | n |                  |                   |                   |
|         | o |                  |                   |                   |
|         | f |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | b |                  |                   |                   |
|         | l |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | d |                  |                   |                   |
|         | s |                  |                   |                   |
|         | a |                  |                   |                   |
|         | m |                  |                   |                   |
|         | p |                  |                   |                   |
|         | l |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | u |                  |                   |                   |
|         | b |                  |                   |                   |
|         | m |                  |                   |                   |
|         | i |                  |                   |                   |
|         | t |                  |                   |                   |
|         | t |                  |                   |                   |
|         | e |                  |                   |                   |
|         | d |                  |                   |                   |
|         | c |                  |                   |                   |
|         | o |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | a |                  |                   |                   |
|         | f |                  |                   |                   |
|         | a |                  |                   |                   |
|         | i |                  |                   |                   |
|         | r |                  |                   |                   |
|         | l |                  |                   |                   |
|         | y |                  |                   |                   |
|         | l |                  |                   |                   |
|         | i |                  |                   |                   |
|         | m |                  |                   |                   |
|         | i |                  |                   |                   |
|         | t |                  |                   |                   |
|         | e |                  |                   |                   |
|         | d |                  |                   |                   |
|         | p |                  |                   |                   |
|         | o |                  |                   |                   |
|         | r |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | o |                  |                   |                   |
|         | n |                  |                   |                   |
|         | o |                  |                   |                   |
|         | f |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | m |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | o |                  |                   |                   |
|         | d |                  |                   |                   |
|         | ' |                  |                   |                   |
|         | s |                  |                   |                   |
|         | a |                  |                   |                   |
|         | n |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | y |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | c |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | r |                  |                   |                   |
|         | a |                  |                   |                   |
|         | n |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | . |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [[]{#n  | * |                  | **The new         | **We will         |
| wql2362 | * |                  | standards from    | purchase new      |
| .ancho  | A |                  | previously        | stock solutions   |
| r}**Mag | l |                  | purchased stock   | and make new      |
| nesium, | t |                  | standards had     | standards. New    |
| Un      | h |                  | some improvement, | standards will be |
| filtere | o |                  | but we still show | on-line one week  |
| d**](ht | u |                  | a negative        | after the new     |
| tp://bq | g |                  | bias.**           | solutions         |
| s.usgs. | h |                  |                   | arrive.**         |
| gov/bsp | t |                  |                   |                   |
| /QADATA | h |                  |                   |                   |
| _all/08 | e |                  |                   |                   |
| Feb/Feb | r |                  |                   |                   |
| 08NWQL0 | e |                  |                   |                   |
| 0927PLA | i |                  |                   |                   |
| 15.gif) | s |                  |                   |                   |
| **ICP   | s |                  |                   |                   |
| labcode | o |                  |                   |                   |
| 2362    | m |                  |                   |                   |
| p       | e |                  |                   |                   |
| armcode | i |                  |                   |                   |
| 00927   | m |                  |                   |                   |
| PLA15** | p |                  |                   |                   |
|         | r |                  |                   |                   |
|         | o |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | m |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | e |                  |                   |                   |
|         | g |                  |                   |                   |
|         | a |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | , |                  |                   |                   |
|         | a |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | l |                  |                   |                   |
|         | l |                  |                   |                   |
|         | p |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | . |                  |                   |                   |
|         | R |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | u |                  |                   |                   |
|         | l |                  |                   |                   |
|         | t |                  |                   |                   |
|         | s |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | c |                  |                   |                   |
|         | e |                  |                   |                   |
|         | i |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | d |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | c |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | l |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | m |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | o |                  |                   |                   |
|         | n |                  |                   |                   |
|         | a |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | a |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | 6 |                  |                   |                   |
|         | . |                  |                   |                   |
|         | 6 |                  |                   |                   |
|         | % |                  |                   |                   |
|         | b |                  |                   |                   |
|         | e |                  |                   |                   |
|         | l |                  |                   |                   |
|         | o |                  |                   |                   |
|         | w |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | v |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | u |                  |                   |                   |
|         | e |                  |                   |                   |
|         | . |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| *P      |   |                  |                   |                   |
| revious |   |                  |                   |                   |
| c       |   |                  |                   |                   |
| omments |   |                  |                   |                   |
| for     |   |                  |                   |                   |
| mag     |   |                  |                   |                   |
| nesium, |   |                  |                   |                   |
| unfi    |   |                  |                   |                   |
| ltered, |   |                  |                   |                   |
| labcode |   |                  |                   |                   |
| 2362,   |   |                  |                   |                   |
| p       |   |                  |                   |                   |
| armcode |   |                  |                   |                   |
| 0092    |   |                  |                   |                   |
| 7PLA15* |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | T |                  | On-line QC charts | The NWQL will     |
|         | h |                  | indicate similar  | continue to       |
| QADATA  | e |                  | bias. It is       | monitor the       |
| Summary | m |                  | probably due to   | instrument for    |
| D       | a |                  | calibration       | bias.             |
| ecember | g |                  | standards. New    |                   |
| 2007    | n |                  | calibration       |                   |
|         | i |                  | standards were    |                   |
|         | t |                  | prepared the      |                   |
|         | u |                  | second week of    |                   |
|         | d |                  | December.         |                   |
|         | e |                  |                   |                   |
|         | o |                  |                   |                   |
|         | f |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | e |                  |                   |                   |
|         | g |                  |                   |                   |
|         | a |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | c |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | g |                  |                   |                   |
|         | . |                  |                   |                   |
|         | R |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | u |                  |                   |                   |
|         | l |                  |                   |                   |
|         | t |                  |                   |                   |
|         | s |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | c |                  |                   |                   |
|         | e |                  |                   |                   |
|         | i |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | d |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | c |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | l |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | m |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | o |                  |                   |                   |
|         | n |                  |                   |                   |
|         | a |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | a |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | 1 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | % |                  |                   |                   |
|         | b |                  |                   |                   |
|         | e |                  |                   |                   |
|         | l |                  |                   |                   |
|         | o |                  |                   |                   |
|         | w |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | v |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | u |                  |                   |                   |
|         | e |                  |                   |                   |
|         | w |                  |                   |                   |
|         | i |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | t |                  |                   |                   |
|         | w |                  |                   |                   |
|         | o |                  |                   |                   |
|         | o |                  |                   |                   |
|         | u |                  |                   |                   |
|         | t |                  |                   |                   |
|         | o |                  |                   |                   |
|         | f |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | x |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | u |                  |                   |                   |
|         | l |                  |                   |                   |
|         | t |                  |                   |                   |
|         | s |                  |                   |                   |
|         | ( |                  |                   |                   |
|         | 3 |                  |                   |                   |
|         | 3 |                  |                   |                   |
|         | % |                  |                   |                   |
|         | ) |                  |                   |                   |
|         | o |                  |                   |                   |
|         | u |                  |                   |                   |
|         | t |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | d |                  |                   |                   |
|         | e |                  |                   |                   |
|         | o |                  |                   |                   |
|         | f |                  |                   |                   |
|         | - |                  |                   |                   |
|         | 2 |                  |                   |                   |
|         | f |                  |                   |                   |
|         | - |                  |                   |                   |
|         | p |                  |                   |                   |
|         | s |                  |                   |                   |
|         | e |                  |                   |                   |
|         | u |                  |                   |                   |
|         | d |                  |                   |                   |
|         | o |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | g |                  |                   |                   |
|         | m |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | T |                  | Online charts     | The NWQL had the  |
|         | h |                  | show a slight     | instrument        |
| QADATA  | e |                  | high bias for     | manufacturer come |
| Summary | d |                  | this analysis at  | out (the week of  |
| October | a |                  | concentrations    | October 15^th^,   |
| 2007    | t |                  | above and below   | 2007) and do a    |
|         | a |                  | those submitted   | complete check of |
|         | d |                  | by BQS.           | the instrument.   |
|         | e |                  |                   | He optimized the  |
|         | m |                  |                   | instrument and    |
|         | o |                  |                   | initial runs      |
|         | n |                  |                   | indicate reduced  |
|         | s |                  |                   | variability. NWQL |
|         | t |                  |                   | will continue to  |
|         | r |                  |                   | monitor the       |
|         | a |                  |                   | instrument.       |
|         | t |                  |                   |                   |
|         | e |                  |                   |                   |
|         | a |                  |                   |                   |
|         | n |                  |                   |                   |
|         | e |                  |                   |                   |
|         | g |                  |                   |                   |
|         | a |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | . |                  |                   |                   |
|         | A |                  |                   |                   |
|         | s |                  |                   |                   |
|         | o |                  |                   |                   |
|         | f |                  |                   |                   |
|         | m |                  |                   |                   |
|         | i |                  |                   |                   |
|         | d |                  |                   |                   |
|         | A |                  |                   |                   |
|         | u |                  |                   |                   |
|         | g |                  |                   |                   |
|         | u |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | 2 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 7 |                  |                   |                   |
|         | , |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | u |                  |                   |                   |
|         | l |                  |                   |                   |
|         | t |                  |                   |                   |
|         | s |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | o |                  |                   |                   |
|         | n |                  |                   |                   |
|         | a |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | a |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | 7 |                  |                   |                   |
|         | . |                  |                   |                   |
|         | 4 |                  |                   |                   |
|         | % |                  |                   |                   |
|         | b |                  |                   |                   |
|         | e |                  |                   |                   |
|         | l |                  |                   |                   |
|         | o |                  |                   |                   |
|         | w |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | v |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | u |                  |                   |                   |
|         | e |                  |                   |                   |
|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [[]{#n  | * |                  | **Changes to the  | **Samples with    |
| wql1572 | * |                  | instrument        | results affected  |
| .anc    | A |                  | calibration       | by the change in  |
| hor}**S | p |                  | calculation       | the calibration   |
| ulfate, | o |                  | resulted in a     | calculation have  |
| Filtere | s |                  | positive bias for | had results       |
| d**](ht | i |                  | samples in the    | recalculated      |
| tp://bq | t |                  | 10-15 mg/L        | using a new       |
| s.usgs. | i |                  | concentration     | calibration       |
| gov/bsp | v |                  | range.**          | calculation.      |
| /QADATA | e |                  |                   | Results showing a |
| _all/08 | b |                  |                   | positive bias     |
| Feb/Feb | i |                  |                   | will be updated   |
| 08NWQL0 | a |                  |                   | to their          |
| 0945IC0 | s |                  |                   | corresponding     |
| 22.gif) | i |                  |                   | lower values and  |
| **IC    | s |                  |                   | re-released.**    |
| labcode | s |                  |                   |                   |
| 1572    | h |                  |                   |                   |
| par     | o |                  |                   |                   |
| mcode** | w |                  |                   |                   |
| **00945 | n |                  |                   |                   |
| IC022** | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | g |                  |                   |                   |
|         | l |                  |                   |                   |
|         | a |                  |                   |                   |
|         | t |                  |                   |                   |
|         | e |                  |                   |                   |
|         | O |                  |                   |                   |
|         | c |                  |                   |                   |
|         | t |                  |                   |                   |
|         | o |                  |                   |                   |
|         | b |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | 2 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 7 |                  |                   |                   |
|         | a |                  |                   |                   |
|         | n |                  |                   |                   |
|         | d |                  |                   |                   |
|         | g |                  |                   |                   |
|         | o |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | g |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | r |                  |                   |                   |
|         | o |                  |                   |                   |
|         | u |                  |                   |                   |
|         | g |                  |                   |                   |
|         | h |                  |                   |                   |
|         | m |                  |                   |                   |
|         | i |                  |                   |                   |
|         | d |                  |                   |                   |
|         | D |                  |                   |                   |
|         | e |                  |                   |                   |
|         | c |                  |                   |                   |
|         | e |                  |                   |                   |
|         | m |                  |                   |                   |
|         | b |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | f |                  |                   |                   |
|         | o |                  |                   |                   |
|         | r |                  |                   |                   |
|         | b |                  |                   |                   |
|         | l |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | d |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | n |                  |                   |                   |
|         | d |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | d |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | f |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | c |                  |                   |                   |
|         | e |                  |                   |                   |
|         | m |                  |                   |                   |
|         | a |                  |                   |                   |
|         | t |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | s |                  |                   |                   |
|         | w |                  |                   |                   |
|         | i |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | a |                  |                   |                   |
|         | c |                  |                   |                   |
|         | o |                  |                   |                   |
|         | n |                  |                   |                   |
|         | c |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | r |                  |                   |                   |
|         | a |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | o |                  |                   |                   |
|         | n |                  |                   |                   |
|         | c |                  |                   |                   |
|         | l |                  |                   |                   |
|         | o |                  |                   |                   |
|         | s |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | o |                  |                   |                   |
|         | 1 |                  |                   |                   |
|         | 4 |                  |                   |                   |
|         | m |                  |                   |                   |
|         | g |                  |                   |                   |
|         | / |                  |                   |                   |
|         | L |                  |                   |                   |
|         | . |                  |                   |                   |
|         | A |                  |                   |                   |
|         | s |                  |                   |                   |
|         | o |                  |                   |                   |
|         | f |                  |                   |                   |
|         | m |                  |                   |                   |
|         | i |                  |                   |                   |
|         | d |                  |                   |                   |
|         | D |                  |                   |                   |
|         | e |                  |                   |                   |
|         | c |                  |                   |                   |
|         | e |                  |                   |                   |
|         | m |                  |                   |                   |
|         | b |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | , |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | s |                  |                   |                   |
|         | n |                  |                   |                   |
|         | o |                  |                   |                   |
|         | l |                  |                   |                   |
|         | o |                  |                   |                   |
|         | n |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | a |                  |                   |                   |
|         | p |                  |                   |                   |
|         | p |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | . |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
|         |   |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
|         | N |                  |                   |                   |
|         | o |                  |                   |                   |
|         | c |                  |                   |                   |
|         | o |                  |                   |                   |
|         | 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       |   |                  |                   |                   |
| ulfate, |   |                  |                   |                   |
| fi      |   |                  |                   |                   |
| ltered, |   |                  |                   |                   |
| labcode |   |                  |                   |                   |
| 1572,   |   |                  |                   |                   |
| p       |   |                  |                   |                   |
| armcode |   |                  |                   |                   |
| 0094    |   |                  |                   |                   |
| 5IC022* |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | D |                  |                   |                   |
|         | a |                  |                   |                   |
| QADATA  | t |                  |                   |                   |
| Summary | a |                  |                   |                   |
| D       | e |                  |                   |                   |
| ecember | x |                  |                   |                   |
| 2007    | h |                  |                   |                   |
|         | i |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | c |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | e |                  |                   |                   |
|         | d |                  |                   |                   |
|         | v |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | l |                  |                   |                   |
|         | i |                  |                   |                   |
|         | t |                  |                   |                   |
|         | y |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | g |                  |                   |                   |
|         | l |                  |                   |                   |
|         | a |                  |                   |                   |
|         | t |                  |                   |                   |
|         | e |                  |                   |                   |
|         | O |                  |                   |                   |
|         | c |                  |                   |                   |
|         | t |                  |                   |                   |
|         | o |                  |                   |                   |
|         | b |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | 2 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 7 |                  |                   |                   |
|         | . |                  |                   |                   |
|         |   |                  |                   |                   |
|         | A |                  |                   |                   |
|         | n |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | y |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | h |                  |                   |                   |
|         | o |                  |                   |                   |
|         | u |                  |                   |                   |
|         | l |                  |                   |                   |
|         | d |                  |                   |                   |
|         | b |                  |                   |                   |
|         | e |                  |                   |                   |
|         | c |                  |                   |                   |
|         | l |                  |                   |                   |
|         | o |                  |                   |                   |
|         | s |                  |                   |                   |
|         | e |                  |                   |                   |
|         | l |                  |                   |                   |
|         | y |                  |                   |                   |
|         | m |                  |                   |                   |
|         | o |                  |                   |                   |
|         | n |                  |                   |                   |
|         | i |                  |                   |                   |
|         | t |                  |                   |                   |
|         | o |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | d |                  |                   |                   |
|         | u |                  |                   |                   |
|         | n |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | l |                  |                   |                   |
|         | 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 |                  |                   |                   |
|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+

######