##### QADATA Summary -- June 2006

The Inorganic Blind Sample Project (IBSP) of the Branch of Quality
Systems reviews about 100 inorganic analytical lines at the National
Water Quality Laboratory (NWQL) using double-blind, quality-control
samples. A summary of this review, the QADATA Summary, is a short report
commenting on only those analytical lines for which the quality-control
charts indicate or have indicated a bias and/or higher than expected
variability. Overall, the vast majority of the inorganic methods at the
NWQL demonstrate acceptable variability and little or no bias.

The data reviewed in this summary is for the time period 11/01/05
through 05/25/06; 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 laboratory 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 a "Lab Comment" and a "Corrective Action." Comments from the
lab are incorporated into the QADATA Summary as received. The most
recent comments and responses are in bold followed by comments and
responses from previous QADATA Summaries. Approximately one month after
the QADATA Summary is distributed, the NWQL and IBSP personnel usually
meet to follow-up on corrective actions and how the corrective actions
have impacted the new data.

Current charts (updated twice weekly) may be accessed at
<http://bqs.usgs.gov/bsp/FY06charts.htm>. Laboratory and district
personnel can also make their own custom QADATA retrieval to parallel
their objectives by using the QADATA Application online at
[http://bqs.usgs.gov/bsp](http://bqs.usgs.gov/bsp/mainpage.html) (select
QADATA Application button). Charts pertaining specifically to this
report can be accessed electronically by following the underlined
hyperlinks embedded within the report and associated with each analysis
discussed.

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

*Tedmund M. Struzeski*

<struzesk@usgs.gov>

Table of Contents

Report Highlights Page

[One-Page Summary](#Highlights) 3

Detailed Description by Analyte

Nutrients

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

Trace Metals

[Strontium, Filtered,](#nwql2507) ICP-MS, Labcode 2507, Parmcode 1080I 5

Majors

[Alkalinity, Filtered,](#nwql2109) Electrometry, Labcode 2109, Parmcode
29801A 6

[Alkalinity, Whole-Water Recoverable,](#nwql0070) Electrometry, Labcode
0070, Parmcode 90410A 6

[Fluoride, Filtered,](#nwql0031) ISE, Labcode 0031, Parmcode 0950B 6

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

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

1.  [Phosphorus](http://bqs.usgs.gov/bsp/QADATA_all/06Jun/Jun06NWQL00666G.gif),
    filtered, colorimetry, low-level, parmcode 0666G -- Increased
    variability, but less bias, starting January 2006.

2.  [Alkalinity](http://bqs.usgs.gov/bsp/QADATA_all/06Jun/Jun06NWQL29801A.gif),
    filtered, electrometry, parmcode 29801A -- Positive bias starting
    October 2005. Recent data show 7.8% bias.

3.  [Alkalinity](http://bqs.usgs.gov/bsp/QADATA_all/06Jun/Jun06NWQL90410A.gif),
    whole-water recoverable, electrometry, parmcode 90410A -- Positive
    bias starting September 2005. Recent data show 7.5% bias.

4.  [Fluoride](http://bqs.usgs.gov/bsp/QADATA_all/06Jun/Jun06NWQL00950B.gif),
    filtered, ISE, parmcode 0950B -- Increase in positive bias starting
    April 2006. Data since then show 18% bias

NWQL PERFORMANCE ON IBSP SAMPLES

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

+----------+------------------+-------------------+-------------------+
| **       | **Problem**      | **NWQL**          | **Corrective**    |
| Nutrient |                  |                   |                   |
| Determin |                  | **Lab Comment**   | **Action**        |
| ations** |                  |                   |                   |
+==========+==================+===================+===================+
| [[]{#    | **A positive     | **One of the      | **The analyst     |
| nwql2331 | bias starting in | samples was       | operating the     |
| .anch    | 2005 is shown    | determined to be  | instrument has    |
| or}**Pho | improving in     | a mispour by the  | been instructed   |
| sphorus, | February 2006.   | analyst. Further  | to take greater   |
| F        | However,         | investigation is  | care when         |
| iltered* | variability has  | now under way to  | preparing samples |
| *](http: | increased as of  | determine the     | for analysis. We  |
| //bqs.us | late-January     | cause of the      | are examining the |
| gs.gov/b | 2006. Since      | lower-than-target | original data and |
| sp/QADAT | then, four out   | values for the    | are rerunning the |
| A_all/06 | of 34 results    | other three       | other three       |
| Jun/Jun0 | (12%) are more   | samples.**        | samples to        |
| 6NWQL006 | than\            |                   | determine if they |
| 66G.gif) | 4 f-pseudosigmas |                   | were mispoured as |
| **L      | lower than the   |                   | well. The         |
| ow-level | target value.**  |                   | examination is    |
| Col      |                  |                   | targeted to be    |
| orimetry |                  |                   | completed by June |
| labcode  |                  |                   | 16, 2006. Further |
| 2331     |                  |                   | corrective action |
| parmcode |                  |                   | may be necessary  |
| 0666G**  |                  |                   | depending on the  |
|          |                  |                   | results of the    |
|          |                  |                   | investigation.**  |
+----------+------------------+-------------------+-------------------+
|          |                  |                   |                   |
+----------+------------------+-------------------+-------------------+

+---------+---+------------------+-------------------+-------------------+
| **Trace | * |                  | **NWQL**          | **Corrective**    |
| Metal   | * |                  |                   |                   |
| De      | P |                  | **Comment**       | **Action**        |
| termina | r |                  |                   |                   |
| tions** | o |                  |                   |                   |
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|         | * |                  |                   |                   |
+=========+===+==================+===================+===================+
| [[]{#n  | * |                  | **New calibration | **Analysis will   |
| wql2507 | * |                  | standards were    | be closely        |
| .ancho  | R |                  | prepared in May.  | monitored until   |
| r}**Str | e |                  | All blind samples | next QADATA       |
| ontium, | s |                  | have been rerun   | Summary is        |
| Fil     | u |                  | using the new     | distributed.**    |
| tered** | l |                  | calibration       |                   |
| ](http: | t |                  | standards and no  |                   |
| //bqs.u | s |                  | bias is evident   |                   |
| sgs.gov | f |                  | at this time.**   |                   |
| /bsp/QA | r |                  |                   |                   |
| DATA_al | o |                  |                   |                   |
| l/06Jun | m |                  |                   |                   |
| /Jun06N | t |                  |                   |                   |
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+---------+---+------------------+-------------------+-------------------+
| *P      |   |                  |                   |                   |
| revious |   |                  |                   |                   |
| c       |   |                  |                   |                   |
| omments |   |                  |                   |                   |
| for     |   |                  |                   |                   |
| str     |   |                  |                   |                   |
| ontium, |   |                  |                   |                   |
| fi      |   |                  |                   |                   |
| ltered, |   |                  |                   |                   |
| ICP-MS, |   |                  |                   |                   |
| labcode |   |                  |                   |                   |
| 2507,   |   |                  |                   |                   |
| p       |   |                  |                   |                   |
| armcode |   |                  |                   |                   |
| 1080I*  |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
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|         | u |                  |                   |                   |
|         | m |                  |                   |                   |
|         | m |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | y |                  |                   |                   |
|         | i |                  |                   |                   |
|         | s |                  |                   |                   |
|         | d |                  |                   |                   |
|         | i |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | r |                  |                   |                   |
|         | i |                  |                   |                   |
|         | b |                  |                   |                   |
|         | u |                  |                   |                   |
|         | t |                  |                   |                   |
|         | e |                  |                   |                   |
|         | d |                  |                   |                   |
|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| From    | A |                  | There was         | We transferred    |
|         | n |                  | increased scatter | the Sr analysis   |
| >       | u |                  | starting in       | to the older      |
|  QADATA | p |                  | October and the   | ICP-MS the week   |
| >       | w |                  | upward trend      | of January 29th   |
| Summary | a |                  | starting in       | and have stopped  |
| > F     | r |                  | December.         | running Sr on the |
| ebruary | d |                  | Starting in Oct.  | new instrument.   |
| > 2006  | t |                  | most of the Sr    | There is not      |
|         | r |                  | results were from | enough data to    |
|         | e |                  | the new ICP-MS.   | see the effect on |
|         | n |                  |                   | the bias. If that |
|         | d |                  |                   | fixes the problem |
|         | i |                  |                   | we will not       |
|         | n |                  |                   | analyze Sr on the |
|         | t |                  |                   | new instrument    |
|         | h |                  |                   | until we          |
|         | e |                  |                   | determine the     |
|         | d |                  |                   | cause of the      |
|         | a |                  |                   | problem and fix   |
|         | t |                  |                   | it.               |
|         | a |                  |                   |                   |
|         | i |                  |                   |                   |
|         | s |                  |                   |                   |
|         | s |                  |                   |                   |
|         | h |                  |                   |                   |
|         | o |                  |                   |                   |
|         | w |                  |                   |                   |
|         | n |                  |                   |                   |
|         | \ |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | g |                  |                   |                   |
|         | D |                  |                   |                   |
|         | e |                  |                   |                   |
|         | c |                  |                   |                   |
|         | e |                  |                   |                   |
|         | m |                  |                   |                   |
|         | b |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | 2 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 5 |                  |                   |                   |
|         | . |                  |                   |                   |
|         | D |                  |                   |                   |
|         | a |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | c |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | n |                  |                   |                   |
|         | e |                  |                   |                   |
|         | x |                  |                   |                   |
|         | h |                  |                   |                   |
|         | i |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | p |                  |                   |                   |
|         | o |                  |                   |                   |
|         | s |                  |                   |                   |
|         | i |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | o |                  |                   |                   |
|         | f |                  |                   |                   |
|         | 7 |                  |                   |                   |
|         | . |                  |                   |                   |
|         | 1 |                  |                   |                   |
|         | % |                  |                   |                   |
|         | a |                  |                   |                   |
|         | b |                  |                   |                   |
|         | o |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | v |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | u |                  |                   |                   |
|         | e |                  |                   |                   |
|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+

+---------+---+------------------+-------------------+-------------------+
| **Major | * |                  | **NWQL**          | **Corrective**    |
| De      | * |                  |                   |                   |
| termina | P |                  | **Comment**       | **Action**        |
| tions** | r |                  |                   |                   |
|         | o |                  |                   |                   |
|         | b |                  |                   |                   |
|         | l |                  |                   |                   |
|         | e |                  |                   |                   |
|         | m |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
+=========+===+==================+===================+===================+
| [[]{#n  | * |                  | **Use of new      | **At this time no |
| wql2109 | * |                  | instrumentation   | corrective action |
| .anchor | T |                  | was initiated in  | will be taken.    |
| }**Alka | h |                  | July 2005. Prior  | The inflection    |
| linity, | e |                  | to the new        | point technique   |
| Fil     | d |                  | instrumentation,  | for determining   |
| tered** | a |                  | spike recoveries  | concentration is  |
| ](http: | t |                  | showed a negative | being             |
| //bqs.u | a |                  | bias. After the   | investigated for  |
| sgs.gov | i |                  | new               | use in this       |
| /bsp/QA | n |                  | instrumentation   | method. The       |
| DATA_al | d |                  | was initiated the | investigation is  |
| l/06Jun | i |                  | bias became       | targeted to be    |
| /Jun06N | c |                  | positive with     | completed by      |
| WQL2980 | a |                  | decreasing        | October 1,        |
| 1A.gif) | t |                  | magnitude and     | 2006.**           |
| *       | e |                  | more scatter.     |                   |
| *Electr | a |                  | Recoveries for    |                   |
| ometric | p |                  | reference         |                   |
| labcode | o |                  | material M-152    |                   |
| 2109    | s |                  | (target value =   |                   |
| p       | i |                  | 6.00 mg/L) from   |                   |
| armcode | t |                  | April 2006 to     |                   |
| 2       | i |                  | present show a    |                   |
| 9801A** | v |                  | 0.2% positive     |                   |
|         | e |                  | bias. M-168       |                   |
|         | b |                  | recoveries        |                   |
|         | i |                  | (target value =   |                   |
|         | a |                  | 28.2 mg/L) from   |                   |
|         | s |                  | March to present  |                   |
|         | . |                  | show a 3.4%       |                   |
|         | R |                  | positive bias.**  |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | u |                  |                   |                   |
|         | l |                  |                   |                   |
|         | t |                  |                   |                   |
|         | s |                  |                   |                   |
|         | f |                  |                   |                   |
|         | r |                  |                   |                   |
|         | o |                  |                   |                   |
|         | m |                  |                   |                   |
|         | s |                  |                   |                   |
|         | a |                  |                   |                   |
|         | m |                  |                   |                   |
|         | p |                  |                   |                   |
|         | l |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | a |                  |                   |                   |
|         | n |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | y |                  |                   |                   |
|         | z |                  |                   |                   |
|         | e |                  |                   |                   |
|         | d |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | o |                  |                   |                   |
|         | f |                  |                   |                   |
|         | N |                  |                   |                   |
|         | o |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | m |                  |                   |                   |
|         | b |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | 2 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 5 |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | e |                  |                   |                   |
|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | e |                  |                   |                   |
|         | d |                  |                   |                   |
|         | o |                  |                   |                   |
|         | n |                  |                   |                   |
|         | a |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | a |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | 7 |                  |                   |                   |
|         | . |                  |                   |                   |
|         | 8 |                  |                   |                   |
|         | % |                  |                   |                   |
|         | a |                  |                   |                   |
|         | b |                  |                   |                   |
|         | o |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | v |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | u |                  |                   |                   |
|         | e |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [[]{#n  | * |                  | **Use of new      | **At this time no |
| wql0070 | * |                  | instrumentation   | corrective action |
| .anchor | T |                  | was initiated in  | will be taken.    |
| }**Alka | h |                  | July 2005. Prior  | The inflection    |
| linity, | e |                  | to the new        | point technique   |
| Whol    | d |                  | instrumentation,  | for determining   |
| e-Water | a |                  | spike recoveries  | concentration is  |
| Recove  | t |                  | showed a negative | being             |
| rable** | a |                  | bias. After the   | investigated for  |
| ](http: | i |                  | new               | use in this       |
| //bqs.u | n |                  | instrumentation   | method. The       |
| sgs.gov | d |                  | was initiated the | investigation is  |
| /bsp/QA | i |                  | bias became       | targeted to be    |
| DATA_al | c |                  | positive with     | completed by      |
| l/06Jun | a |                  | decreasing        | October 1,        |
| /Jun06N | t |                  | magnitude and     | 2006.**           |
| WQL9041 | e |                  | more scatter.     |                   |
| 0A.gif) | a |                  | Recoveries for    |                   |
| *       | p |                  | reference         |                   |
| *Electr | o |                  | material M-152    |                   |
| ometric | s |                  | (target value =   |                   |
| labcode | i |                  | 6.00 mg/L) from   |                   |
| 0070    | t |                  | April 2006 to     |                   |
| p       | i |                  | present show a    |                   |
| armcode | v |                  | 0.2% positive     |                   |
| 9       | e |                  | bias. M-168       |                   |
| 0410A** | b |                  | recoveries        |                   |
|         | i |                  | (target value =   |                   |
|         | a |                  | 28.2 mg/L) from   |                   |
|         | s |                  | March to present  |                   |
|         | . |                  | show a 3.4%       |                   |
|         | R |                  | positive bias.**  |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | u |                  |                   |                   |
|         | l |                  |                   |                   |
|         | t |                  |                   |                   |
|         | s |                  |                   |                   |
|         | f |                  |                   |                   |
|         | r |                  |                   |                   |
|         | o |                  |                   |                   |
|         | m |                  |                   |                   |
|         | s |                  |                   |                   |
|         | a |                  |                   |                   |
|         | m |                  |                   |                   |
|         | p |                  |                   |                   |
|         | l |                  |                   |                   |
|         | e |                  |                   |                   |
|         | s |                  |                   |                   |
|         | a |                  |                   |                   |
|         | n |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | y |                  |                   |                   |
|         | z |                  |                   |                   |
|         | e |                  |                   |                   |
|         | d |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | o |                  |                   |                   |
|         | f |                  |                   |                   |
|         | N |                  |                   |                   |
|         | o |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | m |                  |                   |                   |
|         | b |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | 2 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 5 |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
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|         | b |                  |                   |                   |
|         | i |                  |                   |                   |
|         | a |                  |                   |                   |
|         | s |                  |                   |                   |
|         | e |                  |                   |                   |
|         | d |                  |                   |                   |
|         | o |                  |                   |                   |
|         | n |                  |                   |                   |
|         | a |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | r |                  |                   |                   |
|         | a |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | 7 |                  |                   |                   |
|         | . |                  |                   |                   |
|         | 5 |                  |                   |                   |
|         | % |                  |                   |                   |
|         | a |                  |                   |                   |
|         | b |                  |                   |                   |
|         | o |                  |                   |                   |
|         | v |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | h |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | g |                  |                   |                   |
|         | e |                  |                   |                   |
|         | t |                  |                   |                   |
|         | v |                  |                   |                   |
|         | a |                  |                   |                   |
|         | l |                  |                   |                   |
|         | u |                  |                   |                   |
|         | e |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
| [[]{#n  | * |                  | **The upward      | **The high bias   |
| wql0031 | * |                  | shift in bias     | evident in April  |
| .anch   | T |                  | seen in the BQS   | seems to have     |
| or}**Fl | h |                  | charts was not    | diminished. The   |
| uoride, | e |                  | evident in the    | Nutrient Unit     |
| Fil     | d |                  | online QC charts  | will closely      |
| tered** | a |                  | for the months of | monitor line      |
| ](http: | t |                  | April and May.    | performance and   |
| //bqs.u | a |                  | The analytical    | BQS charts to see |
| sgs.gov | e |                  | system, however,  | what effect the   |
| /bsp/QA | x |                  | has been          | change of         |
| DATA_al | h |                  | thoroughly        | electrodes has    |
| l/06JUN | i |                  | cleaned several   | made. If          |
| /JUN06N | b |                  | times and all     | necessary, new    |
| WQL0095 | i |                  | pump tubing       | standards will be |
| 0B.gif) | t |                  | replaced. A new   | made.**           |
| **\     | a |                  | reference and     |                   |
| ISE     | m |                  | fluoride          |                   |
| labcode | a |                  | electrode were    |                   |
| 0031    | r |                  | installed on May  |                   |
| p       | k |                  | 17.**             |                   |
| armcode | e |                  |                   |                   |
| 0950B** | d |                  |                   |                   |
|         | u |                  |                   |                   |
|         | p |                  |                   |                   |
|         | w |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | d |                  |                   |                   |
|         | s |                  |                   |                   |
|         | h |                  |                   |                   |
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|         | f |                  |                   |                   |
|         | t |                  |                   |                   |
|         | s |                  |                   |                   |
|         | t |                  |                   |                   |
|         | a |                  |                   |                   |
|         | r |                  |                   |                   |
|         | t |                  |                   |                   |
|         | i |                  |                   |                   |
|         | n |                  |                   |                   |
|         | g |                  |                   |                   |
|         | A |                  |                   |                   |
|         | p |                  |                   |                   |
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|         | 2 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 0 |                  |                   |                   |
|         | 6 |                  |                   |                   |
|         | w |                  |                   |                   |
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|         | - |                  |                   |                   |
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|         | n |                  |                   |                   |
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|         | . |                  |                   |                   |
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|         | l |                  |                   |                   |
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|         | a |                  |                   |                   |
|         | m |                  |                   |                   |
|         | p |                  |                   |                   |
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|         | p |                  |                   |                   |
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|         | 1 |                  |                   |                   |
|         | 8 |                  |                   |                   |
|         | % |                  |                   |                   |
|         | a |                  |                   |                   |
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|         | t |                  |                   |                   |
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|         | u |                  |                   |                   |
|         | e |                  |                   |                   |
|         | * |                  |                   |                   |
|         | * |                  |                   |                   |
|         | . |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+
|         |   |                  |                   |                   |
+---------+---+------------------+-------------------+-------------------+

######