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TRIENNIAL DATA REVIEW of the Duck Bay For year 2008

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TRIENNIAL DATA REVIEW of the Duck Bay For year 2008 Powered By Docstoc
					Triennial data review                      Duck Bay 2008                                   March 2009



                                                      Tasmanian Shellfish Quality Assurance Program
                                                                         Environmental Health Unit
                                                             Department of Health & Human Services




                                    TRIENNIAL
                                 DATA REVIEW

                                           of the

                                       Duck Bay

                                      Growing Area




                                     For year 2008




                              Public & Environmental Health Service
                        Department of Health and Human Services Tasmania
                                GPO Box 125B, Hobart TAS 7001




                                              -1-
Triennial data review                          Duck Bay 2008                       March 2009



               TRIENNIAL GROWING AREA DATA RE-
                         EVALUATION

INTRODUCTION
This report contains the results of a triennial review of the data set for the Duck Bay
growing area in north-west Tasmania. The report reviews the water quality data
collected over recent years from the harvesting area with the view of determining
whether the current classification and the current management plan for the area are
still valid and relevant.


PREVIOUS REPORTS
The previous triennial report for this area was completed for the 2005 year with
annual reports being completed for the following years of 2006 and 2007.

CURRENT CLASSIFICATION
The harvesting zone in the growing area is classified as APPROVED
CONDITIONAL. The details are in table 1 below



   LEASES               CLASSIFICATION           CLOSURE           RAINFALL TO
                                                 CRITERIA             PROMPT
                                                                  SALINITY CHECK
   21,23,24,               Approved          Salinity <32.5 ppt     20 mm 7 day.
                          Conditional

      248                 Restricted                    NA              NA

Table 1. Classified leases and critical values in Duck Bay.




SHORELINE SURVEY UPDATE.
TSQAP staff extensively surveyed the areas around Duck Bay on several occasions
during 2008 mainly from the water. There were no changes in the surrounds noted
during these excursions.




                                                  -2-
Triennial data review                           Duck Bay 2008                                     March 2009




                                                         Duck Bay 2
                        Duck Bay 1

                                                                 24          Duck Bay 3
                                                 23

                                                  22
                                                                                              Duck Bay 6
                                Duck Bay 9                        24
                                                                           248
                                                 Duck Bay 11

                                                                                 Duck Bay 4




           Shellfish Lease                                       Safety
           Marine Farm Zone                                      Closure
                                                                 Zone
           Safety Closure Line
           Bacteriological Sample Site                                            STP
           Algal Sample Site
               500m

Figure 1 Duck Bay growing area showing sample sites and leases


SAMPLE SITE CHANGES

There have been no sample site changes since the last annual review of this area. All
sites are shown in figure 1 above together with the harvesting zones and the shellfish
leases.




                                                   -3-
Triennial data review                       Duck Bay 2008                                     March 2009




WATER BACTERIOLOGICAL DATA COLLECTED DURING 2008
Table 2 below shows the bacteriological results and sampling conditions for all water
samples collected from the Duck Bay growing area during 2008.
   Harvest Zone         Site No.        Date           Salinity       7 day       Thermo-     Harvest
                                                                     rainfall     tolerant      Area
                                                                      (mm)       coli/100ml    status
 Duck Bay                           1   01/10/2008            29            14          11     closed
 Duck Bay                           1   19/06/2008          35.1          17.4           1      open
 Duck Bay                           1   26/02/2008          36.3          15.4         0.9      open
 Duck Bay                           1   31/03/2008          35.6          46.2         0.9      open
 Duck Bay                           1   22/05/2008          34.6             8         0.9      open
 Duck Bay                           2   26/02/2008          35.9          15.4           2      open
 Duck Bay                           2   22/05/2008          34.2             8           2      open
 Duck Bay                           2   01/10/2008          33.4            14           2     closed
 Duck Bay                           2   31/03/2008          35.1          46.2         0.9      open
 Duck Bay                           2   19/06/2008          35.5          17.4         0.9      open
 Duck Bay                           3   26/02/2008          35.9          15.4           2      open
 Duck Bay                           3   19/06/2008          35.4          17.4           1      open
 Duck Bay                           3   31/03/2008            36          46.2         0.9      open
 Duck Bay                           3   22/05/2008          34.4             8         0.9      open
 Duck Bay                           3   01/10/2008          34.1            14         0.9     closed
 Duck Bay                           4   01/10/2008          30.3            14          10     closed
 Duck Bay                           4   31/03/2008          35.2          46.2           6      open
 Duck Bay                           4   22/05/2008          34.2             8           2      open
 Duck Bay                           4   26/02/2008          36.1          15.4           1      open
 Duck Bay                           4   19/06/2008          35.3          17.4         0.9      open
 Duck Bay                           6   26/02/2008          36.2          15.4         0.9      open
 Duck Bay                           6   31/03/2008          35.8          46.2         0.9      open
 Duck Bay                           6   22/05/2008          35.1             8         0.9      open
 Duck Bay                           6   19/06/2008          35.4          17.4         0.9      open
 Duck Bay                           6   01/10/2008          34.4            14         0.9     closed
 Duck Bay                           9   01/10/2008          29.2            14          15     closed
 Duck Bay                           9   31/03/2008          35.9          46.2           7      open
 Duck Bay                           9   22/05/2008          34.4             8           1      open
 Duck Bay                           9   26/02/2008            36          15.4         0.9      open
 Duck Bay                           9   19/06/2008          35.2          17.4         0.9      open
 Duck Bay                          11   01/10/2008          30.3            14           3     closed
 Duck Bay                          11   26/02/2008          36.2          15.4           1      open
 Duck Bay                          11   31/03/2008          35.5          46.2         0.9      open
 Duck Bay                          11   22/05/2008          34.4             8         0.9      open
 Duck Bay                          11   19/06/2008          35.6          17.4         0.9      open


Table 2- Water sample results collected from Duck Bay during 2008.




                                               -4-
Triennial data review                        Duck Bay 2008                                March 2009



SUMMARY TABLES-
a) Water Samples collected during year 2008.
Table 3 below shows the summary of water sample thermo-tolerant coliform levels
for samples collected during 2008 for sites in Duck Bay


 Site No.        Total No. of        Max value thermo-tolerant
                 samples -all       coliforms/100 ml- all samples
                  conditions
      1               5                           11
      2               5                            2
      3               5                            2
      4               5                           10
      6               5                           0.9
      9               5                           15
      11              5                            3
Table 3. Summary of water quality data collected from Duck Bay during 2008.


(b)        Meat Samples
Oyster meat samples were analysed for E. coli bacteria levels from each of the two
harvest zones during 2008. The details are given in table 4 below.

  Growing Area          Lease No.      Species             Date     E.coli/g    Lease status
    Duck Bay              N.A.          Oysters         14/2/2008     <0.3            open
    Duck Bay               248          Oysters          5/3/2008     1.5      closed (restricted)
    Duck Bay               248          Oysters          1/4/2008      <1      closed (restricted)
    Duck Bay               22           Oysters          2/4/2008      <1             open
    Duck Bay               22           Oysters         13/3/2008     2.3             open
    Duck Bay               22           Oysters         1/10/2008      <1            closed


Table 4. Results of meat testing from Duck Bay during 2008.


c) Water sample site re-analysis;
Table 5 shows the result of the triennial data analysis of thermo-tolerant coliform
bacteria levels and environmental parameters for the 30 most recently collected water
samples collected under open status criteria for each sample site in each of the
harvest zones. For Duck Bay this involves the last 30 samples collected when
salinity readings were above 32.5 ppt. The data used in this analysis is shown in
Appendix 3.




                                                  -5-
Triennial data review                           Duck Bay 2008                               March 2009




                                                                                       PERCENT
                             SAMPLE
     Zone          Site                      MINIMUM       MAXIMUM       MEDIAN      SAMPLES > 21
                             COUNT
                                            TTC/100 ml     TTC/100 ml   TTC/100 ml    TTC/100 ml
   Duck Bay             1       30              0.9           300           1            6.6
   Duck Bay             2       30             0.9              10         0.9             0
   Duck Bay             3       30             0.9              14             1           0
   Duck Bay             4       30             0.9              30             1          3.3
   Duck Bay             6       30             0.9              120        0.9            3.3
   Duck Bay             9       19             0.9              23         0.9            5.3
   Duck Bay         11          30             0.9              19         1.0             0


Table 5. Thermo-tolerant coliform (TTC) data from Duck Bay all sample sites –last 30 samples under
open status conditions


It should be noted that site 4 in the restricted zone shows good water quality under
these conditions. Site 4 is placed between the restricted lease and the prohibited area
around the Smithton sewerage lagoons. It is approximately 2 km from the sewerage
lagoons.


HEAVY METALS AND OTHER CHEMICAL RESIDUES
Shellfish from Duck Bay were analysed for both heavy metal levels and the presence
of agricultural chemicals during 2008. The results are shown below in table 6.
Heavy metal and chemical residue levels in shellfish meats from Duck Bay do not
show levels of concern.
Table 7 below shows the current maximum levels and generally expected levels of
heavy metals in shellfish as set out in the FSANZ Food Standards Code.


                            FSANZ Max.      FSANZ G.E.L.
                                                           FSANZ G.E.L. 90% (mg/kg)
                            level (mg/kg)   median (mg/kg)
Shellfish
Inorganic Arsenic
                                 1
(mg/kg)
Cadmium (mg/kg)                   2
Lead (mg/kg)                      2
Mercury (mg/kg)                  0.5
Zinc (mg/kg)                                         130                 290
Copper (mg/kg)                                        5                   30

Table 7 FSANZ Food Standards Code values.




                                                     -6-
Triennial data review                         Duck Bay 2008                                   March 2009




                                             Lab.No.:     135717
                                          Sample Id.:    Duck Bay 22

 Method                               Sampled On :         29/7/08

3301-Biota              As*            mg/kgWMB               1.1
                        Cd*            mg/kgWMB            >0.5
                        Co*            mg/kgWMB            >0.5
                        Cr*            mg/kgWMB            >0.5
                        Cu*            mg/kgWMB             5.4
                        Fe*            mg/kgWMB            35.3
                        Mn*            mg/kgWMB             1.9
                        Ni*            mg/kgWMB            >0.5
                        Pb*            mg/kgWMB            >0.5
                        Zn*            mg/kgWMB            77.8
3303-Biota              Hg             mg/kgWMB            <0.02
3503-Biota    Atrazine*                  mg/kg                ND
              Simazine*                  mg/kg                ND
3504-Biota    2,4-D*                     mg/kg                ND
              MCPA*                      mg/kg                ND
3506-Biota    a-BHC*                     mg/kg                ND
              Aldrin*                    mg/kg                ND
              b-BHC*                     mg/kg                ND
              Chlordane*                 mg/kg                ND
              Chlorpyrifos*              mg/kg                ND
              d-BHC*                     mg/kg                ND
              Diazinon*                  mg/kg                ND
              Dieldrin*                  mg/kg                ND
              Dimethoate*                mg/kg                ND
              Disulfoton*                mg/kg                ND
              Endosulfan I*              mg/kg                ND
              Endosulfan II*             mg/kg                ND
              Endosulfan sulphate*       mg/kg                ND
              Endrin aldehyde*           mg/kg                ND
              Endrin*                    mg/kg                ND
              Ethyl parathion*           mg/kg                ND
              Famphur*                   mg/kg                ND
              g-BHC*                     mg/kg                ND
              Heptachlor epoxide*        mg/kg                ND
              Heptachlor*                mg/kg                ND
              Hexachloro benzene*        mg/kg                ND
              Methyl parathion*          mg/kg                ND
              p,p'-DDD*                  mg/kg                ND
              p,p'-DDE*                  mg/kg                ND
              p,p'-DDT*                  mg/kg                ND
              Phorate*                   mg/kg                ND
              Sulfotep*                  mg/kg                ND
              Thionazin*                 mg/kg                ND


Table 6 – Heavy metal and chemical residue testing results – Duck Bay
. ** The arsenic level shown above represents total arsenic: the inorganic component can be estimated
to be 10% of this according to the USFDA guidance document for arsenic in shellfish.




                                                 -7-
Triennial data review                          Duck Bay 2008                           March 2009



CLOSURES DURING 2008
There were two closures of Duck Bay during 2008 both in response to rainfall.
Details are shown in table 8.
         Date Closed                         Date Opened         Number of Days Closed
             1/4/2008                          8/4/2008                      7
            30/6/2008                          7/10/2008                     98
Table 8. Closures in Duck Bay during 2008.

The second closure was prolonged as is normal during the wetter winter months.


COMMENTS
Duck Bay was sampled appropriately during 2008 and the results of water quality
testing were very good overall.
In recent years dry periods through autumn have resulted in the usual winter closures
commencing at later times of the year. This was the case in 2008 with the main
closure not commencing until the end of June.
The excellent results and reliable predictability of the water quality at site 4 in the
restricted zone indicates that it is safe to change the restricted classification of this
zone to Approved Conditional in line with the rest of Duck Bay. Water quality is good
when rainfall is low and salinity high, but deteriorates after heavy rainfall when fresh
water from runoff and the Duck River flow into the growing area.
The restricted classification was originally placed on the lease as a precautionary
measure whilst water quality data was collected, due to the presence of a prohibited
zone around the Smithton sewerage treatment outfall. The sewerage lagoons are
approximately 2kms away and data supplied by the Circular Head Council shows that
effluent from the aerated lagoons complies with DPIW Emission Limit Guidelines for
Sewage Treatment Plants That Discharge Pollutants into Fresh and Marine Waters
2001 (Appendix 2).


CONCLUSIONS
The Duck Bay growing area shall remain classified as Approved Conditional with
current closure criteria being maintained. Lease 248 will change classification to be
Approved Conditional, with the same closure criteria (salinity <32.5 ppt). Regular
meat samples will be taken from lease 248 during 2009. The 2009 management plan
for Duck Bay will be altered to reflect these changes.




                                                 -8-
Triennial data review                   Duck Bay 2008                             March 2009



NEXT EVALUATION.
An annual evaluation of the 2009 calendar year is due for completion in Jan 2010.


BIOTOXIN MONITORING

Duck Bay is a low risk area with respect to biotoxin issues. There have been no
findings of known toxic species in this bay since routine monitoring commenced. The
area is required to be sampled for the presence of toxic algae on a monthly basis when
the area is in the open status in spring through autumn and at least once during the
winter months.

Samples were collected approximately monthly during January through to June, and
another sample taken at the end of winter in October. No samples were taken during
November and December because of temporary sampler unavailability. To remedy
this situation algal sampling is now being conducted by a combination of industry
volunteers and the bacteriological sampler.

No toxic or potentially toxic species were seen during 2008 in either Duck Bay or the
adjoining Big Bay. Results are given in Appendix 1 and 2 below.

The Duck Bay growing area remains a low biotoxin risk.




                                          -9-
                                             AST Report                                                                                   AST Report
                                                No.                                                                                          No.

                                                 Date                                                                                         Date
                                                                                                                                                                                                     Triennial data review




          37264 01/10/2008
          35987 19/06/2008
          35692 22/05/2008
          35196 07/04/2008
          34792 21/02/2008
          34493 30/01/2008
                                                                                                      37264 01/10/2008
                                                                                                      35987 19/06/2008
                                                                                                      35692 22/05/2008
                                                                                                      35196 07/04/2008
                                                                                                      34792 26/02/2008
                                                                                                      34493 31/01/2008
                                              Depth (m)                                                                                    Depth (m)
                                             Bottle sample                                                                                 Integrated




                                   0.3
                                   0.3
                                   0.3
                                   0.3
                                   0.3
                                   0.3
                                                                                                                                 2
                                                                                                                               0.5
                                                                                                                               0.5
                                                                                                                               0.5
                                                                                                                                 2
                                                                                                                                 2




         Note: no value means not detected
                                                                                                     Note: no value means not detected
                                             Alexandrium                                                                                  Alexandrium
                                             cf. catenella                                                                                cf. catenella


                                                             Appendix 2 Big Bay Algal Results 2008
                                                                                                                                                            Appendix 1 Duck Bay Algal Results 2008




                                             Alexandrium                                                                                  Alexandrium




- 10 -
                                               minutum                                                                                      minutum
                                                                                                                                                                                                     Duck Bay 2008




                                             Alexandrium                                                                                  Alexandrium
                                              ostenfeldii                                                                                  ostenfeldii

                                             Alexandrium                                                                                  Alexandrium
                                             cf. tamarense                                                                                cf. tamarense

                                              Dinophysis                                                                                   Dinophysis
                                              acuminata                                                                                    acuminata

                                              Dinophysis                                                                                   Dinophysis
                                                acuta                                                                                        acuta

                                              Dinophysis                                                                                   Dinophysis
                                                                                                                                                                                                     March 2009




                                               caudata                                                                                      caudata

                                              Dinphysis                                                                                  Dinphysis fortii
                                                fortii

                                             Gymnodinium                                                                                 Gymnodinium
                                              catenatum                                                                                   catenatum


                                             Prorocentrum                                                                                Prorocentrum
                                                 lima                                                                                        lima

                                                Pseudo-                                                                                      Pseudo-
                                               nitzschia                                                                                    nitzschia
                                             seriata group                                                                                seriata group
Triennial data review                        Duck Bay 2008                            March 2009




Appendix 3 Water quality data used in triennial re-evaluation.
                                                                     Thermo-
      Zone          Site     Date        Salinity   7 day rain        tolerant
                                                                 coliforms/100ml
 Duck Bay               1   30/05/2006      33.1             1                 300
 Duck Bay               1   30/01/2004      33.6          24.2                   41
 Duck Bay               1   30/07/2007      33.7          15.6                   21
 Duck Bay               1   25/03/2001      32.8          34.4                   20
 Duck Bay               1   29/08/2005      33.1           0.4                  11
 Duck Bay               1   31/03/2004      34.9          17.6                    6
 Duck Bay               1   30/09/2004                      18                    5
 Duck Bay               1   04/01/2006      32.8           21                     2
 Duck Bay               1   28/06/2005      33.4             1                    2
 Duck Bay               1   12/05/2004      35.7           0.8                    2
 Duck Bay               1   28/04/2002      33.1           20                     2
 Duck Bay               1   19/06/2008      35.1          17.4                    1
 Duck Bay               1   10/05/2007       34           26.6                    1
 Duck Bay               1   13/12/2004      33.5           1.2                    1
 Duck Bay               1   16/12/2002      35.9           2.8                    1
 Duck Bay               1   22/05/2008      34.6             8                  0.9
 Duck Bay               1   31/03/2008      35.6          46.2                 0.9
 Duck Bay               1   26/02/2008      36.3          15.4                 0.9
 Duck Bay               1   27/09/2007      34.9          18.6                  0.9
 Duck Bay               1   05/03/2007       36            1.6                 0.9
 Duck Bay               1   24/01/2007      35.2          13.8                  0.9
 Duck Bay               1   02/06/2005      34.7          11.2                  0.9
 Duck Bay               1   15/05/2005      35.8           5.2                 0.9
 Duck Bay               1   06/04/2005      37.3           9.4                 0.9
 Duck Bay               1   07/12/2003      37.2             0                  0.9
 Duck Bay               1   12/01/2003      36.2             0                  0.9
 Duck Bay               1   02/06/2002      35.1           2.6                 0.9
 Duck Bay               1   20/05/2001      36.4            13                  0.9
 Duck Bay               1   04/02/2001      34.9           0.2                 0.9
 Duck Bay               1   04/04/2007      34.8          18.8                  0.9
 Duck Bay               2   10/05/2007      34.8          26.6                   10
 Duck Bay               2   30/09/2004                      18                    9
 Duck Bay               2   10/05/2006      33.3            41                    7
 Duck Bay               2   27/05/2004      32.5          16.8                    7
 Duck Bay               2   30/07/2007      34.4          15.6                    6
 Duck Bay               2   01/10/2008      33.4            14                    2
 Duck Bay               2   22/05/2008      34.2             8                    2
 Duck Bay               2   26/02/2008      35.9          15.4                    2
 Duck Bay               2   30/05/2006      33.9             1                    2
 Duck Bay               2   05/09/2007      33.8          15.6                    1
 Duck Bay               2   28/06/2005      33.1             1                    1
 Duck Bay               2   31/03/2004      35.5          17.6                    1
 Duck Bay               2   19/06/2008      35.5          17.4                 0.9
 Duck Bay               2   31/03/2008      35.1          46.2                 0.9
 Duck Bay               2   23/10/2007      34.4           6.6                 0.9
 Duck Bay               2   27/09/2007       35           18.6                  0.9
 Duck Bay               2   27/08/2007      33.6           0.8                 0.9




                                               - 11 -
Triennial data review                        Duck Bay 2008                           March 2009




                                                                     Thermo-
      Zone          Site     Date        Salinity   7 day rain        tolerant
                                                                 coliforms/100ml
 Duck Bay               2   26/06/2007      33.1           4.4                 0.9
 Duck Bay               2   08/05/2007      33.4          32.4                 0.9
 Duck Bay               2   04/04/2007      35.5          18.8                 0.9
 Duck Bay               2   05/03/2007      36.1           1.6                 0.9
 Duck Bay               2   24/01/2007      35.4          13.8                 0.9
 Duck Bay               2   05/07/2006      33.8          13.6                 0.9
 Duck Bay               2   14/06/2006      34.1           2.6                 0.9
 Duck Bay               2   29/08/2005      32.8           0.4                 0.9
 Duck Bay               2   02/06/2005      34.9          11.2                 0.9
 Duck Bay               2   15/05/2005      35.8           5.2                 0.9
 Duck Bay               2   06/04/2005      37.3           9.4                 0.9
 Duck Bay               2   13/12/2004      33.7           1.2                 0.9
 Duck Bay               2   12/05/2004      35.3           0.8                 0.9
 Duck Bay               3   10/05/2006      33.5           41                   14
 Duck Bay               3   05/07/2006      34.1          13.6                   7
 Duck Bay               3   04/01/2006      32.9           21                    5
 Duck Bay               3   28/06/2005      33.7             1                   5
 Duck Bay               3   30/07/2007      34.6          15.6                   4
 Duck Bay               3   14/11/2005       33           22.8                   4
 Duck Bay               3   26/02/2008      35.9          15.4                   2
 Duck Bay               3   19/06/2008      35.4          17.4                   1
 Duck Bay               3   05/09/2007       34           15.6                   1
 Duck Bay               3   04/04/2007      35.5          18.8                   1
 Duck Bay               3   14/06/2006      33.8           2.6                   1
 Duck Bay               3   30/05/2006      33.9             1                   1
 Duck Bay               3   13/12/2004      33.7           1.2                   1
 Duck Bay               3   30/09/2004                      18                   1
 Duck Bay               3   27/05/2004      33.1          16.8                   1
 Duck Bay               3   01/10/2008      34.1            14                 0.9
 Duck Bay               3   22/05/2008      34.4             8                 0.9
 Duck Bay               3   31/03/2008       36           46.2                 0.9
 Duck Bay               3   23/10/2007      34.7           6.6                 0.9
 Duck Bay               3   27/09/2007       35           18.6                 0.9
 Duck Bay               3   27/08/2007      34.4           0.8                 0.9
 Duck Bay               3   26/06/2007      33.5           4.4                 0.9
 Duck Bay               3   10/05/2007      34.5          26.6                 0.9
 Duck Bay               3   05/03/2007      36.2           1.6                 0.9
 Duck Bay               3   24/01/2007      35.3          13.8                 0.9
 Duck Bay               3   29/08/2005      33.9           0.4                 0.9
 Duck Bay               3   02/06/2005      35.1          11.2                 0.9
 Duck Bay               3   15/05/2005      36.1           5.2                 0.9
 Duck Bay               3   06/04/2005      37.3           9.4                 0.9
 Duck Bay               3   07/01/2001      35.2           5.2                 0.9
 Duck Bay               4   10/05/2007      33.9          26.6                  30
 Duck Bay               4   30/01/2004      33.7          24.2                  21
 Duck Bay               4   31/03/2008      35.2          46.2                   6
 Duck Bay               4   30/09/2004                      18                   6
 Duck Bay               4   24/01/2007      35.2          13.8                   5
 Duck Bay               4   30/07/2007      34.3          15.6                   4




                                               - 12 -
Triennial data review                        Duck Bay 2008                              March 2009




                                                                       Thermo-
      Zone          Site     Date        Salinity   7 day rain          tolerant
                                                                   coliforms/100ml
 Duck Bay               4   28/04/2002      33.1           20                       4
 Duck Bay               4   05/09/2007      33.6          15.6                      3
 Duck Bay               4   30/05/2006      33.3             1                      3
 Duck Bay               4   22/05/2008      34.2               8                    2
 Duck Bay               4   06/04/2005       37              9.4                    2
 Duck Bay               4   26/02/2008      36.1          15.4                      1
 Duck Bay               4   27/08/2007      32.6           0.8                      1
 Duck Bay               4   26/06/2007      32.5           4.4                      1
 Duck Bay               4   28/06/2005      33.5             1                      1
 Duck Bay               4   12/01/2003      35.9             0                      1
 Duck Bay               4   19/06/2008      35.3          17.4                   0.9
 Duck Bay               4   23/10/2007      33.5           6.6                    0.9
 Duck Bay               4   27/09/2007      34.8          18.6                    0.9
 Duck Bay               4   04/04/2007      35.1          18.8                    0.9
 Duck Bay               4   05/03/2007      36.4           1.6                    0.9
 Duck Bay               4   14/06/2006      33.8           2.6                    0.9
 Duck Bay               4   02/06/2005      34.9          11.2                    0.9
 Duck Bay               4   15/05/2005      35.6           5.2                    0.9
 Duck Bay               4   13/12/2004      33.6           1.2                    0.9
 Duck Bay               4   12/05/2004      36.2           0.8                    0.9
 Duck Bay               4   31/03/2004      35.5          17.6                    0.9
 Duck Bay               4   07/12/2003      35.9             0                    0.9
 Duck Bay               4   06/10/2002      33.1           2.4                    0.9
 Duck Bay               4   02/06/2002      35.9           2.6                    0.9
 Duck Bay               6   30/01/2004      32.7          24.2                   120
 Duck Bay               6   10/05/2007      33.6          26.6                     18
 Duck Bay               6   31/03/2004      34.8          17.6                      9
 Duck Bay               6   25/06/2003      32.7           7.6                      6
 Duck Bay               6   28/06/2005      33.8             1                      5
 Duck Bay               6   05/09/2007      32.6          15.6                      3
 Duck Bay               6   24/01/2007      35.7          13.8                      2
 Duck Bay               6   12/05/2004      33.9           0.8                      2
 Duck Bay               6   14/11/2005      33.6          22.8                      1
 Duck Bay               6   02/06/2005      34.8          11.2                      1
 Duck Bay               6   06/04/2005       36            9.4                      1
 Duck Bay               6   01/10/2008      34.4            14                    0.9
 Duck Bay               6   19/06/2008      35.4          17.4                   0.9
 Duck Bay               6   22/05/2008      35.1             8                    0.9
 Duck Bay               6   31/03/2008      35.8          46.2                   0.9
 Duck Bay               6   26/02/2008      36.2          15.4                   0.9
 Duck Bay               6   23/10/2007      33.9           6.6                    0.9
 Duck Bay               6   27/09/2007      34.7          18.6                    0.9
 Duck Bay               6   27/08/2007      33.7           0.8                    0.9
 Duck Bay               6   30/07/2007      34.7          15.6                    0.9
 Duck Bay               6   26/06/2007      32.9           4.4                    0.9
 Duck Bay               6   04/04/2007      35.5          18.8                    0.9
 Duck Bay               6   05/03/2007      36.4           1.6                    0.9
 Duck Bay               6   05/07/2006       34           13.6                    0.9
 Duck Bay               6   14/06/2006      34.4           2.6                    0.9




                                               - 13 -
Triennial data review                         Duck Bay 2008                           March 2009




                                                                      Thermo-
      Zone          Site      Date        Salinity   7 day rain        tolerant
                                                                  coliforms/100ml
 Duck Bay                6   30/05/2006      34.4             1                 0.9
 Duck Bay                6   15/05/2005      36.1           5.2                 0.9
 Duck Bay                6   13/12/2004      33.8           1.2                 0.9
 Duck Bay                6   30/09/2004                      18                 0.9
 Duck Bay                6   07/12/2003      35.1             0                 0.9
 Duck Bay                9   30/07/2007      33.6          15.6                  23
 Duck Bay                9   30/09/2004                      18                  14
 Duck Bay                9   04/01/2006      32.5           21                    8
 Duck Bay                9   31/03/2008      35.9          46.2                   7
 Duck Bay                9   24/01/2007      35.3          13.8                   3
 Duck Bay                9   22/05/2008      34.4             8                   1
 Duck Bay                9   30/05/2006      33.2             1                   1
 Duck Bay                9   02/06/2005      34.6          11.2                   1
 Duck Bay                9   19/06/2008      35.2          17.4                 0.9
 Duck Bay                9   26/02/2008        36          15.4                 0.9
 Duck Bay                9   23/10/2007      33.1           6.6                 0.9
 Duck Bay                9   27/09/2007      34.9          18.6                 0.9
 Duck Bay                9   27/08/2007      32.5           0.8                 0.9
 Duck Bay                9   10/05/2007        34          26.6                 0.9
 Duck Bay                9   04/04/2007      34.9          18.8                 0.9
 Duck Bay                9   05/03/2007      36.1           1.6                 0.9
 Duck Bay                9   15/05/2005      35.8           5.2                 0.9
 Duck Bay                9   06/04/2005      37.6           9.4                 0.9
 Duck Bay                9   13/12/2004      33.7           1.2                 0.9
 Duck Bay               11   10/05/2006      33.3            41                  19
 Duck Bay               11   30/09/2004                      18                  11
 Duck Bay               11   30/07/2007      34.4          15.6                   3
 Duck Bay               11   04/04/2007      35.3          18.8                   2
 Duck Bay               11   05/07/2006      34.2          13.6                   2
 Duck Bay               11   30/05/2006      33.8             1                   2
 Duck Bay               11   26/02/2008      36.2          15.4                   1
 Duck Bay               11   05/03/2007      36.2           1.6                   1
 Duck Bay               11   24/01/2007      35.3          13.8                   1
 Duck Bay               11   28/06/2005      33.1             1                   1
 Duck Bay               11   27/05/2004      34.2          16.8                   1
 Duck Bay               11   12/05/2004      35.6           0.8                   1
 Duck Bay               11   31/03/2004      35.9          17.6                   1
 Duck Bay               11   30/01/2004      35.3          24.2                   1
 Duck Bay               11   12/01/2003      35.7             0                   1
 Duck Bay               11   19/06/2008      35.6          17.4                 0.9
 Duck Bay               11   22/05/2008      34.4             8                 0.9
 Duck Bay               11   31/03/2008      35.5          46.2                 0.9
 Duck Bay               11   23/10/2007      34.3           6.6                 0.9
 Duck Bay               11   27/09/2007      34.9          18.6                 0.9
 Duck Bay               11   27/08/2007      33.3           0.8                 0.9
 Duck Bay               11   26/06/2007      33.1           4.4                 0.9
 Duck Bay               11   10/05/2007      34.6          26.6                 0.9
 Duck Bay               11   14/06/2006       34            2.6                 0.9
 Duck Bay               11   02/06/2005      34.8          11.2                 0.9




                                                - 14 -
Triennial data review                         Duck Bay 2008                             March 2009




                                                                        Thermo-
      Zone          Site      Date        Salinity   7 day rain          tolerant
                                                                    coliforms/100ml
 Duck Bay               11   15/05/2005      35.9             5.2                 0.9
 Duck Bay               11   06/04/2005      37.4             9.4                 0.9
 Duck Bay               11   13/12/2004      33.5             1.2                 0.9
 Duck Bay               11   07/12/2003      36.4               0                 0.9
 Duck Bay               11   16/12/2002      34.7             2.8                 0.9




                                                - 15 -

				
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posted:5/5/2010
language:English
pages:15
Description: TRIENNIAL DATA REVIEW of the Duck Bay For year 2008