date: st1 september 2010 our ref: 15011/tn/00103 your ref ...... · positioning system (dgps)...

AMEC Nuclear UK Limited Booths Park Chelford Road Knutsford Cheshire WA16 8QZ United Kingdom tel: +44 (0)1565 652100 fax: +44 (0)1565 683200

Registered office Booths Park Chelford Road Knutsford Cheshire WA16 8QZ Registered in England no. 1120437 www.amec.com

Date: 1st

September 2010

Our Ref: 15011/TN/00103 Your Ref: WO CIDEN-004

EDF For the attention of Karine Perche

Direct tel +44(0)1352 751 761 Direct fax +44(0)1352 751 451 Email: [email protected]

Dear Karine,

Subject: CIDEN 004 Deliverables

We are pleased to provide the ‘Summary of Marine Surface Water Quality Non-Radiochemical Analysis Results (Campaigns 1-4 including WFD)’. The report is issued in BPE status (Issue 02) and takes account of CIDEN comments. The document has been uploaded to EDF Groupnet in PDF format to the zip file named ‘15011TN00103 Summary of Marine Surface Water Quality Non-Radiochemical Analysis Results (Campaigns 1-4 including WFD) BPE 010910’, in the following location:

“Folders/WDE-UKE (UK EPR)/07a- SITE DEVELOPMENT HINKLEY POINT/7.4 Deliverables - Outputs/22- EIA/22.4 ES Preparation/14- Water Quality/ B- Technical Reports”

If you have any queries regarding this report then we will be pleased to clarify these. Yours sincerely, Giles Bishop (Responsible Engineer) cc: EDF – Leah Beche, Emmanuelle Chardon, Catherine Ollivier, Sylvie Reimeringer, Isabelle Ducher-Peron, Claire Maury AMEC –Hilary Drinkwater, Richard Steel, Richard Wells

http://www.amec.com/�

Summary o f Marine Water Qua lity Non-Radiochemica l Ana lys is Res ults (Campaigns 1-4 inc luding WFD)

15011/TN/00103 Issue 02 - BPE September 2010

AMEC 15011/TN/00103 Document Issue Record Issue 02 - Final

DOCUMENT ISSUE RECORD (engineering documents)

Document Title : Summary of Marine Water Quality Non-Radiochemical Analysis

Results (Campaigns 1-4 including WFD)

Project Reference: 15011/TN/00103 Purpose of Issue : Issue 2

Security Class : EDF access

Issue Description of Amendment Originator/

Author Checker Approver Date

02-PREL

Issue 02 BPE – VSO received from EDF 05/05/10

R Wells R Steel G Bishop 01/09/10

01-PREL

Issue 01 for EDF comment . Re-issue of BPE report 15011/TN/00081 to take account of WFD

R Wells R Steel G Bishop 28/04/10

Total number

of pages: Intro: 1 Text 13 Tables 1 Figures 0 Appendices 6

Previous issues of this document shall be destroyed or marked SUPERSEDED

© AMEC Nuclear UK Limited 2010 This report was prepared exclusively for EDF by AMEC Nuclear UK Limited (AMEC). The quality of information, conclusions and estimates contained herein is consistent with the level of effort involved in AMEC’s services and based on: i) information available at the time of preparation, ii) data supplied by outside sources and iii) the assumptions, conditions and qualifications set forth in this report. This report is intended to be used by EDF only, subject to the terms and conditions of its contract with AMEC. Any other use of, or reliance on, this report by any third party is at that party’s sole risk.

Distribution: EDF

CIDEN CEIDRE 3050aDec07 Controlling Process Process Net 9.7.1

Hinkley EPR NPP New Build Summary of Marine Surface Water Quality Non-radiochemical Analysis Results (Campaigns 1- 4 including WFD)

AMEC 15011/TN/00103 i Issue 02 - Final

C O N T E N T S

1.0 INTRODUCTION .............................................................................................................................. 1

2.0 FIELDWORK .................................................................................................................................... 12.1 Water quality sampling ........................................................................................................ 32.2 In-situ water quality monitoring ............................................................................................ 4

3.0 RESULTS AND DISCUSSION ......................................................................................................... 63.1 Chemical Analytical Results ................................................................................................ 63.2 Water Framework Directive ................................................................................................. 63.3 Summary Marine Water Chemistry Results ........................................................................ 73.4 Statistical Analysis of Water Quality Data ........................................................................... 9

3.4.1 Comparison of marine water chemistry from inshore and offshore areas ............. 93.4.2 Comparison of marine water chemistry under neap and spring tides .................. 10

3.5 Summary In-situ water quality profiling results. ................................................................. 11

4.0 CONCLUSIONS ............................................................................................................................. 12

5.0 REFERENCES ............................................................................................................................... 13

APPENDICES Appendix A: Sampling Location Co-ordinates and Plan Appendix B: Summary Marine Water Quality Chemistry Results Appendix C: Comparison Data Table of Marine Water Chemistry from Inshore and Offshore Areas Appendix D: Comparison Data Table of Marine Water Chemistry Under Neap and Spring Tides Appendix E: Replicate Water Sample Data Appendix F: Profile Graphs of In-situ Water Quality Measurements


AMEC 15011/TN/00103 1 Issue 02 - Final

1.0 INTRODUCTION

Marine surface water quality sampling was conducted by AMEC on four occasions during 2009 in January, May, June and September.

The purpose of these surveys was to characterise the baseline surface water quality conditions in the marine waters in the area offshore from Hinkley Point to provide input data to the Surface Water Quality EIA Technical Note – EDF Reference 15011/TR/001391

2.0 FIELDWORK

. The characterisation of the baseline marine water quality conditions has been required so that the potential impacts of activities and discharges from the construction and operational phase of the proposed Hinkley C power station may be assessed.

The four sampling campaigns were conducted over the following dates:

Campaign 1 – 27th and 28th

Campaign 2 – 1

January 2009

st and 2nd

Campaign 3 – 27

May 2009

th and 28th

Campaign 4 – 12

June 2009

th and 13th

The campaigns were arranged such that two campaigns were conducted on neap tide periods (May and September) and two campaigns on spring tides (January and June) so that the full range of hydrodynamic factors that could affect water quality were encountered during sampling. Details of the tide times and heights on each of the sampling campaigns are detailed in Table 1.

September 2009



Table 1: Tide predictions during the marine water quality sampling campaigns (1 – 4)

Campaign Number

Date High Water

(Time and height (m))

Low water


High Water


Low Water


High Water


1 27/1/09 02:19 – 2.0m

07:53 – 12.4m

14:41 -1.9m

20:14 – 12.2m

28/1/09 03:00 – 2.0m

08:29 – 12.4m

15:20 – 2.0m

21:19 – 12.2m

2 1/5/09 05:26 -2.6m

11:35 – 10.9m

17:48 – 3.1m

23:59 – 10.8m

2/5/09 06:30 – 3.2m

12:48 – 10.3m

19:06 – 3.6m

3 27/6/09 04:52 – 1.1m

10:31 – 12.9m

17:04 – 1.3m

22:47 – 12.9m

28/6/09 05:31 – 1.4m

11:15 – 12.4m

17:43 – 1.7m

23:34 – 12.3m

4 12/909 05:31 – 3.0m

11:40 – 10.6m

17:52 – 3.5m

13/9/09 00:17 – 10.0m

06:25 -3.9m

12:52 – 9.9m

19:03 – 4.3m

Based on times provided for Avonmouth in the ‘Bristol Channel and South Wales Tide Times 2009’ (Nigel Clark Publications2

Tidal time difference for Bridgwater is minus 22 minutes on those quoted above for Bristol.

).

All times quoted as Green Mean Time

Spring tide periods



Fieldwork involved the collection of water quality samples and in-situ water quality profiling data from an area of the Bristol Channel offshore of Hinkley Point.

The sampling area in the Bristol Channel in the vicinity of Hinkley Point was defined by EDF. This area included a near shore (inshore) and an offshore sampling zone. Within each of the two sampling zones, ten sampling locations and eight water profiling locations were identified. In the offshore zone sampling stations were identified as sites A to J for water quality sampling and sites E, F, U, V, and W for in-situ water quality parameter profiling. For the inshore zone, sampling stations were identified as sites K to T and sites K, X, Y, Z and T for in-situ water quality parameter profiling. These sampling locations were sampled in each of the four campaigns. The co-ordinates of all sampling locations are presented in Appendix A.

Additional sampling locations were identified in response to changes in the proposed locations of offshore cooling water abstraction and discharge points. Eight additional sampling locations were identified for areas between the original sampling zones and for an inshore area. Water quality sampling was agreed with EDF to be undertaken at five of these locations and in-situ profiling measurements at three locations. These additional sampling stations where water sampling was undertaken are identified as AA, CC, EE, FF and HH. In-situ profiling measurements were undertaken at sampling sites AA, CC, EE and also included a further inshore site at sampling station HH. All these additional sampling locations were included in the May, June and September sampling campaigns.

Fieldwork was carried out using the Environment Agency’s Vigilance survey vessel. Two AMEC staff carried out all sampling activities and the vessel was operated by an experienced skipper and bosun.

2.1 Water quality sampling

Each sampling location was visited in turn; the vessels differential Global Positioning System (dGPS) navigation equipment allowed locations to be identified with considerable accuracy i.e. to within approximately 1 m of the exact grid reference. Strong tidal currents were experienced during the sampling visits, particularly during spring flood and ebb periods and the boat was maintained at station on the sampling location whilst samples / profiles were obtained and then the vessel was moved to the next location.

At each of the water sampling locations, three water samples were collected, i.e. one from just below the surface, one at mid-water and one approximately 1 m above the sea bed; the water depth at each point was identified using the Vigilance’s hull mounted echo sounder. The location of the water quality sampling locations, including those where in-situ profiles were recorded, are given as grid references in Appendix A. Replicate surface water samples were collected at two locations for the purposes of quality control during each campaign. A field blank sample, containing laboratory grade water, was also submitted to the testing laboratory with the samples collected during the 4th campaign (September 2009).



The collection of each water sample was undertaken using a 5 litre discrete water sampler. The sampler was attached to the vessel via a side arm davit and the supporting line was marked at metre intervals. The sampler employed was the same unit that is utilised by the Environment Agency for similar sample collection in this type of offshore environment. The sampler was a snap-end type sampler that was set before lowering to the desired depth. The sampler was lowered and raised a short distance on a number of occasions whilst at depth to ensure that the water collected was representative of the area of water column being sampled. The sampler was then closed by sending a messenger weight down the supporting line. The sampler was then recovered on each occasion and the collected water was decanted into a large plastic holding bucket. Two such samples were collected to provide enough water for each sample set (four replicate samples were taken). By combining samples in the holding bucket, thorough mixing was ensured before sub-samples were decanted into relevant laboratory bottles. The holding bucket was emptied and rinsed thoroughly with sea water before the samples from the following sampling station were taken.

Two 2.5 litre glass ‘Winchester’ bottles supplied by the testing laboratory were filled for each individual sample; bottles were filled to the top to minimise remaining airspace. Additional sample bottles for radiological analysis (one 250 ml brown plastic bottle and one 2 litre plastic bottle) were also filled. The collected sample bottles were immediately refrigerated in cool boxes with ice packs. All samples, including replicates, were labelled in a consistent fashion so that they could not be distinguished by the testing laboratory.

Cool boxes were stored in a locked compound overnight and were delivered by courier the next morning to the appropriate UKAS and MCerts accredited testing laboratories.

Each sample was tested for a range of inorganic and organic non-radiochemical parameters that had previously been agreed with EDF.

2.2 In-situ water quality monitoring

Each of the water quality profiling locations was visited in turn, again using the vessel’s dGPS instruments. The locations of the profile monitoring stations are shown in Appendix G. The water depth at each profile monitoring location was noted using the vessel’s hull mounted echo sounder. Based on the water depth, the interval for water quality data recording through the water column was determined; in most instances, intervals of 1.5 m were used.

A multi-probe meter was used to carry out the in-situ monitoring. Prior to deployment the meter was calibrated, both for dissolved oxygen and salinity. The meter was recalibrated for dissolved oxygen between carrying out the inshore and offshore sampling, as is good practice with any membrane based instrumentation that may experience calibration drift.



The meter was roped and weighted to minimise tidal current drift and was then lowered through the water column. At each sampling interval, the instrument was allowed to stabilise before readings were recorded. At each interval, water temperature, dissolved oxygen (as % saturation and concentration in mg/l) and salinity were measured and recorded on field data sheets.



3.0 RESULTS AND DISCUSSION

3.1 Chemical Analytical Results

Results of the chemical analysis of collected water samples are presented in Appendices B, C and D. These results have been summarised and presented as the following:

• A summary table showing overall mean values from the combined campaigns (Appendix B);

• A summary table comparing the results from offshore and inshore sampling areas (See Appendix C); and,

• A summary table comparing results obtained from neap (campaigns 2 and 4) and spring (campaigns 1 and 3) tide periods (see Appendix D).

Results for the replicate samples collected during campaigns 1 to 4 are presented in Appendix E. Generally there was good accord between the results obtained for the replicate samples that provided confidence in the laboratory testing results. Over the course of the campaigns the data were scrutinised on receipt and the testing laboratory was requested to re-examine identified samples for certain parameters where necessary.

3.2 Water Framework Directive

In December 2009, Directions3 were issued by the UK government which allowed the revised water quality environmental standards developed by UKTAG for the Water Framework Directive (2000/60/EC)4 to be implemented. The area sampled for marine water quality for the Hinkley C studies falls within the Bridgwater Bay WFD waterbody which is classed as a coastal waterbody. A description of this waterbody is provided in Annex B of the Environment Agency’s South West River Basin District Management Plan5

Environmental Standards used to assess the water quality offshore of Hinkley Point are those provided within the Directions

. The waterbody is currently indicated to have a moderate overall quality with the objective of reaching ‘Good Status’ by 2027. Dissolved oxygen and dissolved inorganic nitrogen provide supporting elements to the waterbody’s assigned moderate status with the current conditions described as high and moderate (uncertain) respectively. The moderate status of dissolved inorganic nitrogen, although indicated to be uncertain, is one of the causal reasons why ‘Good Status’ will not be achieved by 2015.

, for transitional and coastal waters. Within the results tables the previously applicable saltwater EQS values derived from the H1 Guidance6

have been retained for comparative purposes.



3.3 Summary Marine Water Chemistry Results

Following review of the summary data presented in Appendix B the key highlights are:

1. All chemicals, for which there are assigned WFD Environmental Quality Standard (EQS), had averaged values below the threshold values. Concentrations of the organic chemicals expected to be discharged from the EPR plants were below the laboratory’s minimum reporting values (MRV) on each of the four campaigns.

2. The marine waters off Hinkley Point are characterised by high concentrations of suspended solids with a mean value of 264 mg/l and show increasing concentrations with depth. The maximum recorded value during the four sampling campaigns was 1,795 mg/l. The high suspended solids concentrations arise from sediment mobilisation under bed scouring flows associated with the high tidal range (and associated tidal currents). There is corresponding low water transparency which will restrict light availability for primary productivity by marine algae.

3. There was a general trend of increasing mean total metals concentrations (i.e. inclusive of dissolved and particulate fractions) with depth, such that the highest values were recorded for samples collected from the lower water column. This is likely to result from metal adsorption to sediment particles which display a corresponding increased concentration with water depth.

4. Exceedance of the Environmental Quality Standard threshold level for dissolved copper, of 5 µg/l, was recorded at numerous sites across the sampling area on each of the sampling campaigns. The number of sampling sites where EQS exceedances were recorded for each campaign were:

Dissolved Copper

Campaign 1 (27th and 28th

Campaign 2 (1

January 2009) 13

st and 2nd

Campaign 3 (27

May 2009) 17

th and 28th

Campaign 4 (12

June 2009) 8

th and 13th

Comparison to the dissolved copper EQS needs to be made using an annual averaged value. The mean value calculated from the combined data for all campaigns and at all sampling locations for dissolved copper was 3.95 µg/l and was below the EQS threshold value.

September 2009) 1



5. Exceedance of the Maximum Acceptable Concentration (MAC) EQS for dissolved mercury of 0.07 µg/l was recorded at a limited number of sites during the sampling campaign. The number of sampling sites where MAC-EQS exceedances were recorded for each campaign were:

Dissolved Mercury exceedances

Campaign 1 (27th and 28th

Campaign 2 (1

January 2009) 3

st and 2nd

Campaign 3 (27

May 2009) 1

th and 28th

Campaign 4 (12

June 2009) 0

th and 13th

The mean value calculated from the combined data for all campaigns and at all sampling locations for dissolved mercury was 0.02 µg/l which is below the Annual Average EQS threshold value of 0.05 µg/l.

September 2009) 0

6. pH values were typical of seawater with a mean overall value of 7.83 and a range of 7.04 to 8.05 pH units.

7. Salinity varied between the sampling campaigns, which is likely related to the changing volumes of freshwater entering the Severn Estuary from discharging rivers at the times of the different sampling visits. The overall mean value was 30.4 ppt which is less than the normal range for full strength sea water of 32 to 34 ppt. The range of salinity values recorded during the sampling campaigns was 23.3 to 33.3 ppt.

8. Under the WFD, the assessment of dissolved inorganic nitrogen status requires a mean winter concentration in micromoles per litre to be calculated for samples collected between the 1st November to the 28th March. Within the present campaign only one sample was collected during this period in Campaign 1 (27th and 28th January 2009). As this data has only been obtained from one monitoring visit it needs to be viewed with caution when comparing to the WFD EQS for winter dissolved inorganic nitrogen. The WFD EQS for dissolved inorganic nitrogen in transitional and coastal waters vary with both salinity and turbidity. Under the WFD criteria the sampling areas included in the monitoring campaign would be classed as high turbidity (i.e. a mean value greater than 300 mg/l) based on the mean suspended solids concentration for the January 2009 sampling campaign being 494 mg/l. The EQS threshold values for ‘high’ and ‘good’ dissolved inorganic nitrogen status in very turbid waters are 18 and 270 µM/l respectively to which comparison of a 99th percentile results value is made. This calculated percentile value for dissolved inorganic nitrogen in the January 2009 campaign was 130.1 µM/l which is between the ‘high’ and ‘good’ status standards.



3.4 Statistical Analysis of Water Quality Data

Analyses were undertaken on the water quality dataset to determine if there were significant spatial or tidal differences in the mean concentrations of tested parameters. For the purpose of comparison, statistical analyses were undertaken on the overall mean concentrations at each site. A statistical ‘F-test’ was applied to the data to determine if there was a significant difference in the variances of the two data sets being compared. Following this initial testing an appropriate two-tailed ‘t-test’ (i.e. test selected for equal or unequal variances depending upon the results of the F-test) was applied to determine if there was a significant difference (with 95% confidence) between the mean values for either inshore and offshore sampling areas or neap and spring tide conditions.

For the purpose of statistical analysis values that were reported to be below the minimum reporting value for the testing laboratory were assigned a zero value.

3.4.1 Comparison of marine water chemistry from inshore and offshore areas

A comparison was made between the water quality sampling results obtained from inshore and offshore sampling areas (see Appendix C). The additional sampling sites have been split such that sites AA and CC were incorporated into the data set for the offshore area and sites EE, FF and HH for the inshore area. Within the presented tables (see Appendix C), the parameters with significant mean differences have been highlighted for ease of comparison.

The key findings from this comparison are:

• Metals: There was spatial (inshore and offshore) and depth variability for the range of total and dissolved metals that were analysed. However, statistical analysis of the overall mean values showed that the only significant difference detected was for total lead which had higher concentrations within the inshore sampling area.

These data indicate that the water quality conditions, in terms of dissolved and total metal concentrations, are relatively homogenous in the marine waters off Hinkley Point.

• General Water Quality Parameters (see Appendix B for listing): These results showed a degree of variability across the sampling area and with depth. Statistical comparison of the overall mean values across the range of tested parameters indicated that the only significant difference occurred for chemical oxygen demand (COD). COD concentrations were higher in the inshore sampling area with a mean concentration of 16.4 mg/l.

• Expected Organic Discharge Chemicals (see Appendix B for listing): No results above laboratory minimum reporting values were recorded for these chemicals at any of the sampling sites across all 4 sampling campaigns.



The comparison of the water quality data for inshore and offshore sampling areas (Appendix C) indicates a high degree of homogeneity when considered as a whole across all sampling sites and campaigns. Some local spatial and depth variations are evident within data collected for each campaign. The high degree of homogeneity is likely to be associated with the high tidal flow velocities creating well mixed water quality conditions in the marine waters off Hinkley Point.

3.4.2 Comparison of marine water chemistry under neap and spring tides

A comparison has been made of the water quality data collected during neap (Campaigns 2 and 4) and spring (Campaigns 1 and 3) tidal conditions. These data are presented in Table in Appendix D. It was not possible to compare data at the resolution of ebb and flood tides as the number of sampling sites sampling visited meant that the surveys were conducted over 2 days through a range of tidal conditions. Within the presented table (see Appendix D), the parameters with significant mean differences have been highlighted for ease of comparison.

The key findings from this comparison are:

• Metals: Statistical analysis of the water quality data sets comparing overall mean concentrations from neap and spring tide periods found four total metal and 2 dissolved metal parameters that showed significant differences. For neap tide periods higher mean concentrations of total copper, iron and boron were found. It should be noted that total boron was only analysed in samples from two sampling campaigns (campaigns 3 and 4). During spring tide periods higher mean concentrations of total chromium, dissolved nickel and dissolved boron were recorded.

• General Water Quality Parameters: Seven general water quality parameters differed significantly between neap and spring tide periods. During neap tide periods higher overall mean concentrations of pH and orthophosphate were recorded. Under spring tidal states higher mean values of nitrate, phosphate, suspended solids, biochemical oxygen demand (BOD) and COD were found. There is a significant difference in suspended solid concentrations during neap and spring tide periods with respective mean concentrations of 185 and 351 mg/l. The higher suspended solids concentrations under spring tide conditions are associated with higher tidal flow velocities causing greater mobilisation of bed sediment deposits.

• Expected Organic Discharge Chemicals: No results above laboratory minimum reporting values were recorded for these chemicals at any of the sampling sites across all 4 sampling campaigns.

Marine water quality parameters exhibited greater significant variability between neap and spring tide periods than between inshore and offshore sampling areas. This suggests that tidal conditions may have a greater influence on local marine water quality off Hinkley Point than spatial variations between inshore and offshore areas.



3.5 Summary In-situ water quality profiling results.

The results for the in-situ water quality measurements have been prepared as profile graphs of dissolved oxygen, temperature and salinity against depth and are presented in Appendix F.

These data indicate that dissolved oxygen levels, temperature and salinity were within a normal range for coastal waters. There was no evidence of thermal or saline stratification and in-situ measurements of dissolved oxygen concentration were consistent throughout the depth of the water column at each sampling location. These data are indicative of a system that is well mixed by high tidal velocities. Stratification may potentially occur under some conditions, for example under heat wave conditions or certain tidal states. Such stratification was not detected within the four sampling campaigns which were conducted across a range of tidal flood and ebb states.

The WFD EQS now includes threshold values for dissolved oxygen for transitional and coastal waters. For marine waters with a salinity lower than 35 the ‘high’ category threshold is defined by a calculated oxygen concentration of (7 mg/l – (0.037 x salinity)). The most stringent (and therefore most precautionary) EQS threshold applicable to this High Status waterbody unit is calculated by selecting the lowest monitored salinity of 23.5, which produces a threshold value of 6.13 mg/l. Comparison is made to this threshold value using a 5th

The results of the first in-situ sampling campaign (January 2009) indicated relatively low salinity conditions (in the range of 23 to 25) in the sampling area in comparison to subsequent campaigns.

percentile calculated for the entire monitoring data set which is 6.40 mg/l. Therefore the dissolved oxygen levels within the sampling area have a High Status which accords with the current status indicated in the Bridgwater Bay waterbody description.



4.0 CONCLUSIONS

Results from the marine surface water quality campaign indicated that all tested parameters were in the normal expected range for coastal waters and no exceedances of Water Framework Directive annual EQS values were recorded. Elevated concentrations of dissolved copper were recorded across the sampling area during each campaign, but the overall mean value was below the WFD EQS threshold for dissolved copper. Elevated dissolved mercury that exceeded the MAC-EQS were also recorded in the first two campaigns at a very limited number of sites.

The marine waters offshore from Hinkley Point are characterised by high concentrations of suspended solids. The concentrations are significantly higher during spring tide periods when compared with neap tide. Suspended solids are likely to have an effect on resultant water quality conditions for other parameters, such as concentrations of some types of total metals that may be associated with mobilisation of sediment particulates.

Statistical analysis of the data comparing overall mean concentrations for tested parameters from the near shore and offshore sampling areas indicate that water quality is relatively homogenous across the entire sampling area, although local spatial and depth variation is noted within each campaign. This homogeneity is due to efficient mixing associated with high tidal flow velocities. Significant differences for mean concentrations were found for a larger number of water quality parameters between neap and spring tide periods. This suggests that tidal conditions exert a larger influence on the variability of local water quality conditions compared to spatial differences between inshore and offshore areas.

The location of Hinkley Point in the outer Severn Estuary, that receives discharges from numerous large river systems, will have an influence on local salinity particularly following periods of prolonged heavy rainfall when freshwater inputs are high (i.e. January 2009).

In-situ water quality measurements reflected the high degree of water mixing induced by strong tidal currents with no evidence of stratification in the water column during the sampling campaign. The dissolved oxygen levels recorded were found to be consistent with the WFD EQS High Status values for transitional and coastal waters.

The water quality campaigns have provided a detailed baseline data set against which the potential impacts of discharges to the marine environment during the construction and operation phases of the proposed Hinkley C station can be made.



5.0 REFERENCES

1 AMEC (2009) Surface Water Quality EIA Technical Note – EDF Reference

15011TR00139 (currently under revision).

2 Bristol Channel and South Wales Tide Times 2009. Nigel Clarke Publications, Dorset.

3 The River Basin Districts Typology, Standards and Groundwater Threshold Values (Water Framework Directive) (England and Wales) Directions 2009.

4 Water Framework Directive (2000/60/EC).

5 Environment Agency (2009) South West Rivers Basin District Management Plan.

6 Environment Agency & Environment and Heritage Service & Scottish Environment Protection Agency, Integrated Pollution Prevention and Control (IPPC), Environmental Assessment and Appraisal of BAT, IPPC H1, March 2008.


AMEC 15011/TN/00103 Issue 02 - Final

APPENDIX A – Sampling location coordinates and plan


AMEC 15011/TN/00103 A1 Issue 02 - Final

BNG System Degrees, Decimal Minutes Point ID X (m) Y (m) N W A 313733 148565 51 13.78357602 3 14.21371287 B 314133 148977 51 14.00943097 3 13.87599803 C 314532 149388 51 14.23472148 3 13.53907417 D 314932 149800 51 14.46054427 3 13.20125040 E 315328 150216 51 14.68847303 3 12.86686590 F 314408 148277 51 13.63433730 3 13.62967987 G 314881 148780 51 13.90990392 3 13.23051702 H 315353 149283 51 14.18543928 3 12.83213423 I 315825 149786 51 14.46095232 3 12.43367238 J 316297 150290 51 14.73698262 3 12.03514578 K 317239 147220 51 13.08927667 3 11.18297550 L 317619 147545 51 13.26788580 3 10.86107573 M 317999 147870 51 13.44648030 3 10.53913500 N 318379 148195 51 13.62505902 3 10.21715490 O 318758 148520 51 13.80361380 3 9.89599270 P 317845 147021 51 12.98719428 3 10.65973650 Q 318163 147264 51 13.12101408 3 10.38994463 R 318481 147506 51 13.25428320 3 10.12011462 S 318799 147749 51 13.38808140 3 9.85027248 T 319117 147992 51 13.52186903 3 9.58040430 U 314627 148741 51 13.88658762 3 13.44818377 V 314839 149198 51 14.13499477 3 13.27256970 W 315089 149723 51 14.42041620 3 13.06523958 X 317687 147405 51 13.19295847 3 10.80073512 Y 318169 147603 51 13.30392457 3 10.38943973 Z 318674 147812 51 13.42099523 3 9.95850642 AA 315049 148144 51 13.56835177 3 13.07712323 BB 315914 148366 51 13.69579512 3 12.33717168 CC 316773 148573 51 13.81501710 3 11.60209632 DD 317596 148781 51 13.93439003 3 10.89790447 EE 318432 148976 51 14.04679032 3 10.18230672 FF 318567 147074 51 13.02199638 3 10.04034907 GG 318887 147318 51 13.15634802 3 9.76882098 HH 319268 147580 51 13.30091557 3 9.44511240 Coordinates of each water quality sampling location and in-situ water quality profiling locations. Coordinates are provided in the British National Grid system and also as Degrees and Decimal minutes.



APPENDIX B – Summary Marine Water Quality Chemistry Results

Summary Non-radiochemical Water Quality Results for Campaigns 1 to 4Pre-WFD WFD Overall Mean (+/-) St. DevSaltwater Environmental Standards

Total and Dissolved Metals Units MRV EQS for Transitional and Coastal Waters Surface Mid-depth Bottom Surface Mid-depth BottomTotal Arsenic µg/l 1 - - 3.34 (+/-) 0.95 3.53 (+/-) 1.14 3.74 (+/-) 1.20 3.53 (+/-) 1.11 <1 <1 <1 5.95 9.57 8.99

Total Cadmium µg/l 1 - - 0.00 (+/-) 0.00 0.03 (+/-) 0.33 0.00 (+/-) 0.00 0.01 (+/-) 0.19 <1 <1 <1 <1 <1 <1Total Chromium µg/l 1 - - 0.82 (+/-) 1.96 1.54 (+/-) 5.66 1.88 (+/-) 8.92 1.42 (+/-) 6.20 <1 <1 <1 16.3 52.6 86.1

Total Lead µg/l 1 - - 0.24 (+/-) 0.54 0.41 (+/-) 0.66 0.56 (+/-) 0.85 0.40 (+/-) 0.70 <1 <1 <1 2.45 2.18 3.13Total Nickel µg/l 1 - - 3.03 (+/-) 2.26 3.04 (+/-) 1.79 3.81 (+/-) 3.61 3.29 (+/-) 2.68 <1 <1 <1 13.2 7.81 32.0

Total Copper µg/l 1 - - 15.6 (+/-) 9.22 15.1 (+/-) 8.95 16.2 (+/-) 9.86 15.6 (+/-) 9.33 <1 5.02 5.05 47.5 47.8 54.0Total Zinc µg/l 1 - - 37.8 (+/-) 25.2 38.8 (+/-) 23.0 41.2 (+/-) 26.3 39.3 (+/-) 24.9 <1 <1 <1 124 98.0 117

Total Mercury µg/l 0.1 - - 0.02 (+/-) 0.20 0.10 (+/-) 0.60 0.00 (+/-) 0.00 0.04 (+/-) 0.37 <0.1 <0.1 <0.1 1.94 4.12 <0.1Total Iron µg/l 5 - - 114 (+/-) 81.6 134 (+/-) 96.3 156 (+/-) 103 135 (+/-) 95.3 <5 8.00 <5 554 515 572

Total Boron µg/l 5 7000AT - 4092 (+/-) 1420 4031 (+/-) 1407 4055 (+/-) 1414 4059 (+/-) 1406 3882 3620 3816 7173 4219 4332Dissolved Arsenic µg/l 1 25AD 25AD 2.29 (+/-) 0.70 2.25 (+/-) 0.81 2.36 (+/-) 0.70 2.30 (+/-) 0.74 <1 <1 <1 3.83 3.65 3.37

Dissolved Cadmium µg/l 1 2.5AD 0.2AD and 1.5MAC 0.00 (+/-) 0.00 0.00 (+/-) 0.00 0.00 (+/-) 0.00 0.00 (+/-) 0.00 <1 <1 <1 <1 <1 <1Dissolved Chromium µg/l 1 15AD 0.6AD and 32 (95P)1 0.02 (+/-) 0.16 0.01 (+/-) 0.10 0.03 (+/-) 0.19 0.02 (+/-) 0.15 <1 <1 <1 1.20 1.00 1.02

Dissolved Lead µg/l 5 25AD 7.2AD 0.03 (+/-) 0.20 0.01 (+/-) 0.13 0.01 (+/-) 0.14 0.02 (+/-) 0.16 <5 <5 <5 1.46 1.23 1.36Dissolved Nickel µg/l 1 30AD 20AD 0.17 (+/-) 0.43 0.24 (+/-) 0.61 0.16 (+/-) 0.44 0.19 (+/-) 0.50 <1 <1 <1 1.68 3.94 2.01

Dissolved Copper µg/l 1 5AD 5AD 4.12 (+/-) 2.51 3.92 (+/-) 2.79 3.82 (+/-) 2.66 3.95 (+/-) 2.65 <1 <1 <1 13.6 14.1 13.4Dissolved Mercury µg/l 0.1 0.3AD 0.05AD 0.07MAC 0.01 (+/-) 0.10 0.04 (+/-) 0.28 0.00 (+/-) 0.01 0.02 (+/-) 0.17 <0.1 <0.1 <0.1 1.00 1.94 <0.1

Dissolved Iron µg/l 5 1000AD 1000AD 10.3 (+/-) 12.5 13.9 (+/-) 14.0 16.3 (+/-) 17.4 13.5 (+/-) 14.9 <5 <5 <5 49.6 53.0 80.0Dissolved Boron µg/l 5 - - 3731 (+/-) 208 3753 (+/-) 383 3747 (+/-) 246 3744 (+/-) 288.4 2538 3022 2679 4123 6679 4707

Dissolved Aluminium µg/l 5 - - 18.6 (+/-) 20.1 20.8 (+/-) 18.4 29.1 (+/-) 36.6 22.8 (+/-) 26.64 <5 <5 5.27 160 104 240Dissolved Manganese µg/l 5 - - 3.28 (+/-) 4.44 3.48 (+/-) 4.42 3.76 (+/-) 4.94 3.51 (+/-) 4.59 <5 <5 <5 19.3 16.4 18.9

Dissolved Lithium µg/l 10 - - 116 (+/-) 27.7 114 (+/-) 26.6 112 (+/-) 32.8 114 (+/-) 29.1 57.9 56.4 <10 184 179 175Notes: For calculation of statistics results that were less than the minimum reporting value (MRV) were considered to be zero.Pre-WFD EQS Values taken from Environment Agency Integrated Pollution Prevention and Control (IPPC), Environmental Assessment and Appraisal of BAT, IPPC H1, March 2008.WFD environmental standards for transitional and coastal waters taken from The River Basins Typology, Standards and Groundwater threshold values (Water Framework Directive) (England and Eales) Directions 2009, December 2009.A= Annual AverageT= TotalD = DissolvedMAC=Maximum acceptable concentrationP = Percentile1 - Values for chromium VI only at WFD Good standard.

Mean (+/-) St. Dev(no of samples = 95/ layer)

Mid-depth Bottom(Based on

285 samples)Surface(no of samples = 95 / layer) (no of samples =95 / layer)

Minimum Maximum


General Water Quality Parameters MRV EQS for Transitional and Coastal Waters Surface Mid-depth Bottom Surface Mid-depth BottompH Value pH units 6 - 8.5P - 7.82 (+/-) 0.21 7.83 (+/-) 0.21 7.84 (+/-) 0.20 7.83 (+/-) 0.20 7.20 7.04 7.37 8.03 8.04 8.05Sulphate mg/l 1 - - 1918 (+/-) 241 1922 (+/-) 186 1932 (+/-) 183 1924 (+/-) 204 1260 1398 1278 2960 2201 2213Chloride mg/l 1 - - 14303 (+/-) 1655 14198 (+/-) 1473 14324 (+/-) 1447 14275 (+/-) 1523 10871 10971 11123 20251 15885 16323

Free Chlorine mg/l 0.10 - - 0.01 (+/-) 0.04 0.01 (+/-) 0.03 0.01 (+/-) 0.03 0.01 (+/-) 0.03 <0.1 <0.1 <0.1 0.30 0.20 0.20Nitrate as NO3 mg/l 1.00 - - 3.78 (+/-) 1.39 3.81 (+/-) 1.44 3.70 (+/-) 1.39 3.76 (+/-) 1.40 1.29 1.55 1.68 6.75 6.89 6.79Nitrite as NO2 mg/l 0.05 - - 0.00 (+/-) 0.00 0.00 (+/-) 0.00 0.00 (+/-) 0.00 0.00 (+/-) 0.00 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Total Ammonia as NH4 mg/l 0.03 - - 0.17 (+/-) 0.12 0.16 (+/-) 0.09 0.16 (+/-) 0.10 0.16 (+/-) 0.11 <0.03 <0.03 <0.03 0.58 0.47 0.45Unionised ammonia as N* µg/l * 21A 0.02 (+/-) 0.00 0.00 (+/-) 0.00 0.00 (+/-) 0.00 0.002 (+/-) 0.00 0.00 0.00 0.00 0.002 0.002 0.00

Kjeldahl Nitrogen mg/l 0.10 - - 0.28 (+/-) 0.13 0.29 (+/-) 0.10 0.36 (+/-) 0.14 0.31 (+/-) 0.13 0.07 0.03 0.03 0.68 0.51 0.62Phosphate mg/l 0.02 - - 0.04 (+/-) 0.04 0.03 (+/-) 0.04 0.03 (+/-) 0.03 0.03 (+/-) 0.04 <0.02 <0.02 <0.02 0.14 0.11 0.10

Sodium mg/l 0.01 - - 8523 (+/-) 1671 8457 (+/-) 1828 8656 (+/-) 1485 8545 (+/-) 1663 5045 3895 5262 14550 16070 13200Suspended Solids mg/l 5 - - 168 (+/-) 91 242 (+/-) 165 380 (+/-) 360 264 (+/-) 250 33 70 74 485 1134 1795

BOD mg/l 2 - - 1.24 (+/-) 2.68 0.95 (+/-) 2.05 1.41 (+/-) 2.69 1.20 (+/-) 2.49 <2 <2 <2 12.8 11.2 14.4COD mg/l 2 - - 13.9 (+/-) 13.7 12.7 (+/-) 12.4 15.8 (+/-) 19.6 14.1 (+/-) 15.6 <2 <2 <2 90.0 99.0 169

Orthophosphate mg/l 0.02 - - 0.00 (+/-) 0.00 0.00 (+/-) 0.00 0.00 (+/-) 0.00 0.00 (+/-) 0.00 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02Salinity ppt 1 - - 30.3 (+/-) 3.24 30.4 (+/-) 3.18 30.5 (+/-) 3.15 30.4 (+/-) 3.18 23.3 23.3 23.4 33.0 33.3 33.3

Turbidity NTU 2 - - 176 (+/-) 87 215 (+/-) 103 246 (+/-) 125 211 (+/-) 108 60 80 110 440 >500 >500Silicates mg/l 5 - - 0.00 (+/-) 0.01 0.00 (+/-) 0.00 0.00 (+/-) 0.01 0.00 (+/-) 0.01 <5 <5 <5 <5 <5 <5

Notes: For calculation of statistics results that were less than the minimum reporting value (MRV) were considered to be zero.Pre-WFD EQS Values taken from Environment Agency Integrated Pollution Prevention and Control (IPPC), Environmental Assessment and Appraisal of BAT, IPPC H1, March 2008.WFD environmental standards for transitional and coastal waters taken from The River Basins Typology, Standards and Groundwater threshold values (Water Framework Directive) (England and Eales) Directions 2009, December 2009.A= Annual AverageT= TotalD = DissolvedP = Percentile*=calculated value based on ammonia concentration, salinity, temperatue and pH data

Mid-depth Bottom

Mean (+/-) St. Dev(no of samples = 95 / layer) (no of samples = 95 / layer) (no of samples = 95 / layer)(Based on

285 samples)Surface

Minimum Maximum


Expected Organic Discharge Chemicals MRV EQS for Transitional and Coastal Waters Surface Mid-depth Bottom Surface Mid-depth BottomTotal Petroleum Hydrocarbons µg/l 10 - - 0.00 (+/-) 0.00 0.00 (+/-) 0.00 0.00 (+/-) 0.00 0.00 (+/-) 0.00 <10 <10 <10 <10 <10 <10

Non Ionic Detergents mg/l 0.10 - - 0.00 (+/-) 0.00 0.00 (+/-) 0.00 0.00 (+/-) 0.00 0.00 (+/-) 0.00 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1Cationic Detergents mg/l 0.10 - - 0.00 (+/-) 0.00 0.00 (+/-) 0.00 0.00 (+/-) 0.00 0.00 (+/-) 0.00 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1

Trihalomethanes µg/l 1 - - 0.00 (+/-) 0.00 0.00 (+/-) 0.00 0.00 (+/-) 0.00 0.00 (+/-) 0.00 <1 <1 <1 <1 <1 <1Dichloromethane µg/l 1 - 20A 0.00 (+/-) 0.00 0.00 (+/-) 0.00 0.00 (+/-) 0.00 0.00 (+/-) 0.00 <1 <1 <1 <1 <1 <1

Dichlorobromomethane µg/l 1 - - 0.00 (+/-) 0.00 0.00 (+/-) 0.00 0.00 (+/-) 0.00 0.00 (+/-) 0.00 <1 <1 <1 <1 <1 <1Dibromochloromethane µg/l 1 - - 0.00 (+/-) 0.00 0.00 (+/-) 0.00 0.00 (+/-) 0.00 0.00 (+/-) 0.00 <1 <1 <1 <1 <1 <1

Chloroform µg/l 1 12A 2.5A 0.00 (+/-) 0.00 0.00 (+/-) 0.00 0.00 (+/-) 0.00 0.00 (+/-) 0.00 <1 <1 <1 <1 <1 <1Dibromoacetonitrile µg/l 1 - - 0.00 (+/-) 0.00 0.00 (+/-) 0.00 0.00 (+/-) 0.00 0.00 (+/-) 0.00 <1 <1 <1 <1 <1 <1Dibromo acetic acid µg/l 1 - - 0.00 (+/-) 0.00 0.00 (+/-) 0.00 0.00 (+/-) 0.00 0.00 (+/-) 0.00 <1 <1 <1 <1 <1 <1

Hydrazine mg/l 0.10 - - 0.00 (+/-) 0.00 0.00 (+/-) 0.00 0.00 (+/-) 0.00 0.00 (+/-) 0.00 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1Ethanolamine mg/l 0.01 - - 0.00 (+/-) 0.00 0.00 (+/-) 0.00 0.00 (+/-) 0.00 0.00 (+/-) 0.00 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01

Morpholine mg/l 0.01 - - 0.00 (+/-) 0.00 0.00 (+/-) 0.00 0.00 (+/-) 0.00 0.00 (+/-) 0.00 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01Notes: For calculation of statistics results that were less than the minimum reporting value (MRV) were considered to be zero.Pre-WFD EQS Values taken from Environment Agency Integrated Pollution Prevention and Control (IPPC), Environmental Assessment and Appraisal of BAT, IPPC H1, March 2008.WFD environmental standards for transitional and coastal waters taken from The River Basins Typology, Standards and Groundwater threshold values (Water Framework Directive) (England and Eales) Directions 2009, December 2009.A= Annual AverageT= TotalD = DissolvedP = Percentile

(no of samples = 95 / layer) (no of samples = 95 / layer) (no of samples = 95 / layer)Surface Mid-depth Bottom

(Based on285 samples)

Minimum MaximumMean (+/-) St. Dev



APPENDIX C – Comparison of marine water chemistry from inshore and offshore areas

Comparison of non-radiochemical water quality results for offshore and inshore areas `Pre-WFD WFD Saltwater Environmental Standards

EQS for Transitional and Coastal Waters Inshore Surface Offshore Surface Inshore Mid-depth Offshore Mid-depth Inshore Bottom Offshore Bottom Inshore Surface Offshore Surface Inshore Mid-depth Offshore Mid-depth Inshore Bottom Offshore BottomTotal Arsenic (µg/l) 1 - - 3.4 (+/-) 1.0 3.3 (+/-) 0.9 3.5 (+/-) 0.9 3.6 (+/-) 1.4 3.7 (+/-) 0.9 3.8 (+/-) 1.4 3.5 (+/-) 0.94 3.55 (+/-) 1.3 Variances different Means equal 1.6 <1 1.8 <1 1.7 <1 6.0 5.0 6.2 9.6 6.1 9.0

Total Cadmium (µg/l) 1 - - 0.0 (+/-) 0.0 (+/-) 0 0.0 (+/-) 0.1 (+/-) 0.4723 0.0 (+/-) 0.0 (+/-) 0 0.0 (+/-) 0.0 (+/-) 0.3 Variances different Means equal <1 <1 <1 <1 <1 <1 <1 <1 <1 3.2 <1 <1Total Chromium (µg/l) 1 - - 1.0 (+/-) 2.5 0.7 (+/-) 1.2 2.1 (+/-) 7.7 0.9 (+/-) 1.9 2.8 (+/-) 12.3 0.9 (+/-) 1.3 2.0 (+/-) 8.48 0.8 (+/-) 1.5 Variances different Means equal <1 <1 <1 <1 <1 <1 16.3 4.7 52.6 11.0 86.1 5.0

Total Lead (µg/l) 1 - - 0.3 (+/-) 0.6 0.1 (+/-) 0.4 0.5 (+/-) 0.7 0.4 (+/-) 0.6 0.7 (+/-) 0.9 0.5 (+/-) 0.7 0.5 (+/-) 0.78 0.3 (+/-) 0.6 Variances different Means different <1 <1 <1 <1 <1 <1 2.5 1.4 2.2 1.9 3.1 2.8Total Nickel (µg/l) 1 - - 2.9 (+/-) 2.5 3.2 (+/-) 1.9 2.7 (+/-) 1.5 3.4 (+/-) 2.0 3.6 (+/-) 4.5 4.0 (+/-) 2.3 3.1 (+/-) 3.12 3.5 (+/-) 2.1 Variances different Means equal <1 <1 <1 <1 <1 <1 13.2 11.0 7.0 7.8 32.0 10.8

Total Copper (µg/l) 1 - - 15.9 (+/-) 9.7 15.3 (+/-) 8.7 15.3 (+/-) 9.3 14.8 (+/-) 8.7 16.3 (+/-) 11.1 16.1 (+/-) 8.5 15.8 (+/-) 10.0 15.4 (+/-) 8.6 Variances different Means equal 5.2 <1 5.0 5.6 5.0 5.2 44.7 47.5 43.7 47.8 54.0 43.3Total Zinc (µg/l) 1 - - 38.3 (+/-) 26.7 37.3 (+/-) 23.9 39.4 (+/-) 22.8 38.1 (+/-) 23.4 42.8 (+/-) 29.6 39.6 (+/-) 22.6 40.2 (+/-) 26.4 38.3 (+/-) 23.1 Variances equal Means equal <1 <1 <1 8.1 <1 6.9 124 112 98.0 85.0 117 89.9

Total Mercury (µg/l) 0.1 - - 0.04 (+/-) 0.3 0.0 (+/-) 0.0 0.2 (+/-) 0.8 0.0 (+/-) 0.2 0.0 (+/-) 0.0 (+/-) 0.0 0.1 (+/-) 0.50 0.0 (+/-) 0.1 Variances different Means equal <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 1.9 <0.1 4.1 1.1 <0.1 <0.1Total Iron (µg/l) 5 - - 110 (+/-) 53.8 119 (+/-) 104 127 (+/-) 64.3 142 (+/-) 122 158 (+/-) 94.9 154 (+/-) 112 131 (+/-) 75.3 138 (+/-) 113 Variances different Means equal <5 11.0 12.4 8.1 <5 6.2 205 554 311 515 443 572

Total Boron (µg/l) 5 7000 AT - 4145 (+/-) 623 4034 (+/-) 89.7 4050 (+/-) 125 4011 (+/-) 124 4057 (+/-) 94.1 4052 (+/-) 125 4084 (+/-) 369 4032 (+/-) 1739 Variances different Means equal 3908 3882 3620 3625 3816 3856 7173 4231 4219 4219 4213 4332Dissolved Arsenic (µg/l) 1 25AD 25AD 2.4 (+/-) 0.5 2.2 (+/-) 0.8 2.4 (+/-) 0.5 2.1 (+/-) 1.0 2.5 (+/-) 0.5 2.2 (+/-) 0.9 2.4 (+/-) 0.49 2.2 (+/-) 0.9 Variances different Means equal 1.0 <1 1.4 <1 1.4 <1 3.1 3.8 3.4 3.6 3.4 3.4

Dissolved Cadmium (µg/l) 1 2.5AD 0.2AD and 1.5MAC 0.0 (+/-) 0.0 (+/-) 0.0 0.0 (+/-) 0.0 (+/-) 0.0 0.0 (+/-) 0.0 (+/-) 0.0 0.0 (+/-) 0.0 (+/-) 0.0 - - <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1Dissolved Chromium (µg/l) 1 15AD 0.6AD and 32 (95P)1 0.05 (+/-) 0.2 0.0 (+/-) 0.0 0.02 (+/-) 0.1 0.0 (+/-) 0.0 0.02 (+/-) 0.1 0.0 (+/-) 0.2 0.03 (+/-) 0.17 0.0 (+/-) 0.1 Variances different Means equal <1 <1 <1 <1 <1 <1 1.2 <1 1.0 <1 1.0 1.1

Dissolved Lead (µg/l) 5 25AD 7.2AD 0.03 (+/-) 0.2 0.0 (+/-) 0.2 0.0 (+/-) 0.0 0.03 (+/-) 0.2 0.0 (+/-) 0.03 (+/-) 0.2 0.01 (+/-) 0.12 0.03 (+/-) 0.19 Variances different Means equal <5 <5 <5 <5 <5 <5 1.5 1.2 <5 1.2 0.0 1.4Dissolved Nickel (µg/l) 1 30AD 20AD 0.2 (+/-) 0.5 0.1 (+/-) 0.4 0.3 (+/-) 0.6 0.2 (+/-) 0.6 0.2 (+/-) 0.5 0.1 (+/-) 0.4 0.2 (+/-) 0.51 0.1 (+/-) 0.5 Variances equal Means equal <1 <1 <1 <1 <1 <1 1.7 1.4 2.0 3.9 1.6 2.0

Dissolved Copper (µg/l) 1 5AD 5AD 4.3 (+/-) 2.6 4.0 (+/-) 2.4 4.0 (+/-) 3.0 3.8 (+/-) 2.5 4.1 (+/-) 3.0 3.5 (+/-) 2.2 4.1 (+/-) 2.87 3.8 (+/-) 2.4 Variances different Means equal 1.1 <1 <1 <1 <1 <1 13.6 9.0 14.1 10.0 13.4 9.1Dissolved Mercury (µg/l) 0.1 0.3AD 0.05AD 0.07MAC 0.02 (+/-) 0.1 0.0 (+/-) 0.0 0.1 (+/-) 0.4 0.0 (+/-) 0.0 0.0 (+/-) 0.0 (+/-) 0.0 0.03 (+/-) 0.24 0.0 (+/-) 0.0 Variances different Means equal <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 1.0 <0.1 1.9 <0.1 <0.1 0.1

Dissolved Iron (µg/l) 5 1000AD 1000AD 10.0 (+/-) 12.5 10.6 (+/-) 12.5 12.6 (+/-) 12.6 15.2 (+/-) 15.3 15.4 (+/-) 16.8 17.2 (+/-) 18.1 12.7 (+/-) 14.2 14.3 (+/-) 15.6 Variances equal Means equal <5 <5 <5 <5 <5 <5 46.4 49.6 41.8 53.0 61.1 80.0Dissolved Boron (µg/l) 5 - - 3736 (+/-) 213 3726 (+/-) 205 3731 (+/-) 270 3777 (+/-) 478 3789 (+/-) 244 3701 (+/-) 244 3752 (+/-) 243 3735 (+/-) 331 Variances different Means equal 3239 3257 2538 3292 3297 2679 4015 4123 4050 6679 4707 4038

Dissolved Aluminium (µg/l) 5 - - 18.3 (+/-) 24.2 18.9 (+/-) 14.8 18.9 (+/-) 16.6 22.9 (+/-) 20.1 25.3 (+/-) 37.1 33.1 (+/-) 36.0 20.8 (+/-) 27.3 25.0 (+/-) 25.8 Variances equal Means equal <5 <5 <5 <5 <5 <5 160 78.8 80.1 104 240 174Dissolved Manganese (µg/l) 5 - - 3.0 (+/-) 4.4 3.5 (+/-) 4.5 2.9 (+/-) 4.1 4.1 (+/-) 4.7 3.4 (+/-) 4.8 4.2 (+/-) 5.1 3.1 (+/-) 4.40 3.9 (+/-) 4.8 Variances equal Means equal <5 <5 <5 <5 <5 <5 19.3 14.1 13.6 16.4 17.9 18.9

Dissolved Lithium (µg/l) 10 - - 112 (+/-) 25.9 121 (+/-) 29.1 111 (+/-) 27.1 117 (+/-) 25.8 113 (+/-) 28.1 110 (+/-) 37.5 112 (+/-) 26.9 116 (+/-) 31.3 Variances different Means equal 64.3 57.9 56.4 57.3 56.9 <10 184 179 179 154 175 150Notes: For calculation of statistics results that were less than the minimum reporting value (MRV) were considered to be zero.Pre-WFD EQS Values taken from Environment Agency Integrated Pollution Prevention and Control (IPPC), Environmental Assessment and Appraisal of BAT, IPPC H1, March 2008.WFD environmental standards for transitional and coastal waters taken from The River Basins Typology, Standards and Groundwater threshold values (Water Framework Directive) (England and Eales) Directions 2009, December 2009.A= Annual AverageT= TotalD = DissolvedMAC=Maximum acceptable concentrationP = Percentile1 - Values for chromium VI only at WFD Good standard.

Comparison of non-radiochemical water quality results for offshore and inshore areasPre-WFD WFD

MRV Saltwater Environmental StandardsEQS for Transitional and Coastal Waters Inshore Surface Offshore Surface Inshore Mid-depth Offshore Mid-depth Inshore Bottom Offshore Bottom Inshore Surface Offshore Surface Inshore Mid-depth Offshore Mid-depth Inshore Bottom Offshore Bottom

pH Value (Units) 6 - 8.5P - 7.8 (+/-) 0.2 7.8 (+/-) 0.19 7.8 (+/-) 0.2 7.8 (+/-) 0.17 7.8 (+/-) 0.2 7.8 (+/-) 0.18 7.8 (+/-) 0.23 7.8 (+/-) 0.18 Variances different Means equal 7.2 7.3 7.0 7.4 7.4 7.4 8.1 8.1 8.1 8.1 8.1 8.1Sulphate (mg/l) 1 - - 1879 (+/-) 208 1959 (+/-) 268 1895 (+/-) 200 1950 (+/-) 168 1915 (+/-) 203 1949 (+/-) 158 1896 (+/-) 203 1953 (+/-) 203 Variances equal Means equal 1260 1387 1398 1574 1278 1609 2265 2960 2238 2201 2298 2213Chloride (mg/l) 1 - - 14047 (+/-) 1346 14575 (+/-) 1908 14046 (+/-) 1351 14360 (+/-) 1592 14216 (+/-) 1281 14439 (+/-) 1611 14103 (+/-) 1320 14458 (+/-) 1700 Variances different Means equal 11210 10871 11423 10971 11423 11123 15898 20251 15352 15885 15687 16323

Nitrate as NO3 (mg/l) 1 - - 3.9 (+/-) 1.3 3.6 (+/-) 1.5 4.0 (+/-) 1.3 3.7 (+/-) 1.6 3.8 (+/-) 1.3 3.6 (+/-) 1.5 3.9 (+/-) 1.3 3.6 (+/-) 1.5 Variances different Means equal 1.3 1.6 1.7 1.6 2.0 1.7 6.2 6.8 6.7 6.9 6.7 6.8Nitrite as NO2 (mg/l) 0.05 - - 0.00 (+/-) 0.00 0.00 (+/-) 0.00 0.00 (+/-) 0.00 0.00 (+/-) 0.00 0.00 (+/-) 0.00 0.00 (+/-) 0.00 0.00 (+/-) 0.00 0.00 (+/-) 0.00 - - <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Total Ammonia as NH4 (mg/l) 0.03 - - 0.2 (+/-) 0.1 0.18 (+/-) 0.12 0.2 (+/-) 0.1 0.16 (+/-) 0.09 0.2 (+/-) 0.1 0.15 (+/-) 0.10 0.2 (+/-) 0.11 0.17 (+/-) 0.11 Variances equal Means equal 0.01 0.01 <0.03 <0.03 <0.03 0.01 0.58 0.46 0.47 0.40 0.40 0.46Phosphate (mg/l) 0.02 - - 0.04 (+/-) 0.04 0.03 (+/-) 0.04 0.04 (+/-) 0.04 0.03 (+/-) 0.04 0.03 (+/-) 0.03 0.03 (+/-) 0.03 0.04 (+/-) 0.04 0.03 (+/-) 0.03 Variances equal Means equal <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 0.14 0.12 0.11 0.11 0.09 0.10

Sodium (mg/l) 0.01 - - 8625 (+/-) 1521 8413 (+/-) 1827 8352 (+/-) 1502 8569 (+/-) 2134 8558 (+/-) 1432 8761 (+/-) 1548 8512 (+/-) 1480 8581 (+/-) 1844 Variances different Means equal 5495 5045 3895 4279 5262 6078 11828 14550 10740 16070 11860 13200Suspended Solids (mg/l) 5 - - 156 (+/-) 82.6 182 (+/-) 98.2 225 (+/-) 145 261 (+/-) 183 381 (+/-) 353 379 (+/-) 372 254 (+/-) 243 274 (+/-) 257 Variances equal Means equal 33.0 60.0 70.0 86.0 115 74.0 360 485 700 1134 1720 1795

BOD (mg/l) 2 - - 1.5 (+/-) 3.3 0.91 (+/-) 1.8 1.1 (+/-) 2.5 0.75 (+/-) 1.4 1.6 (+/-) 3.2 1.2 (+/-) 2.1 1.4 (+/-) 3.0 0.96 (+/-) 1.8 Variances different Means equal <2 <2 <2 <2 <2 <2 12.8 8 11.2 4 14.4 10.6COD (mg/l) 2 - - 16.5 (+/-) 18.0 11.2 (+/-) 5.7 15.6 (+/-) 16.1 9.7 (+/-) 5.2 17.0 (+/-) 14.7 14.4 (+/-) 23.9 16.4 (+/-) 16.2 11.8 (+/-) 14.5 Variances equal Means different <2 <2 <2 <2 <2 <2 90.0 26 99.0 22 85.0 169

Orthophosphate (mg/l) 0.02 - - 0.00 (+/-) 0.00 0.00 (+/-) 0.00 0.00 (+/-) 0.00 0.00 (+/-) 0.00 0.00 (+/-) 0.00 0.00 (+/-) 0.00 0.00 (+/-) 0.00 0.00 (+/-) 0.0 - - <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02Salinity (ppt) 1 - - 30.0 (+/-) 3.0 30.6 (+/-) 3.5 30.1 (+/-) 2.9 30.7 (+/-) 3.5 30.2 (+/-) 2.8 30.7 (+/-) 3.5 30.1 (+/-) 2.9 30.7 (+/-) 3.4 Variances different Means equal 23.5 23.3 23.7 23.3 23.7 23.4 32.2 33 32.3 33.3 32.3 33.3

Turbidity (NTU) 2 - - 170 (+/-) 86.2 182 (+/-) 89.3 202 (+/-) 92.2 229 (+/-) 106 260 (+/-) 123 230 (+/-) 100 209 (+/-) 105 213 (+/-) 111 - - 80.0 60.0 <2 100 <2 <2 430 440 420.0 500 500.0 500Silicates (µg/l) 5 - - 0.0 (+/-) 0.0 0.00 (+/-) 0.01 0.00 (+/-) 0.00 0.00 (+/-) 0.00 0.004 (+/-) 0.02 0.00 (+/-) 0.00 0.001 (+/-) 0.01 0.00 (+/-) 0.009 Variances different Means equal <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5

Free Chlorine (mg/l) 0.10 - - 0.01 (+/-) 0.04 0.00 (+/-) 0.03 0.01 (+/-) 0.04 0.00 (+/-) 0.00 0.01 (+/-) 0.03 0.01 (+/-) 0.04 0.01 (+/-) 0.04 0.004 (+/-) 0.03 Variances different Means equal <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 0.3 0.2 0.2 0.0 0.2 0.2Kjeldahl Nitrogen (mg/l) 0.10 - 0.3 (+/-) 0.1 0.24 (+/-) 0.11 0.3 (+/-) 0.1 0.27 (+/-) 0.11 0.4 (+/-) 0.1 0.35 (+/-) 0.14 0.3 (+/-) 0.13 0.29 (+/-) 0.13 Variances equal Means equal 0.09 0.07 0.18 0.03 0.06 0.03 0.68 0.50 0.51 0.48 0.60 0.62

Notes: For calculation of statistics results that were less than the minimum reporting value (MRV) were considered to be zero.Pre-WFD EQS Values taken from Environment Agency Integrated Pollution Prevention and Control (IPPC), Environmental Assessment and Appraisal of BAT, IPPC H1, March 2008.WFD environmental standards for transitional and coastal waters taken from The River Basins Typology, Standards and Groundwater threshold values (Water Framework Directive) (England and Eales) Directions 2009, December 2009.A= Annual AverageT= TotalD = DissolvedMAC=Maximum acceptable concentrationP = Percentile

Comparison of non-radiochemical water quality results for offshore and inshore areasPre-WFD WFD

MRV Saltwater Environmental StandardsEQS for Transitional and Coastal Waters Inshore Surface Offshore Surface Inshore Mid-depth Offshore Mid-depth Inshore Bottom Offshore Bottom Inshore Surface Offshore Surface Inshore Mid-depth Offshore Mid-depth Inshore Bottom Offshore Bottom

Total Petroleum hydrocarbons µg/l 10 - - 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 - - <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10Anionic Detergents mg/l 0.10 - - 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 - - <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1

Cationic Detergents (mg/l) 0.10 - - 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 - - <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1Trihalomethanes (µg/l) 1 - - 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 - - <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1Dichloromethane (µg/l) 1 - 20A 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 - - <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1

Dichlorobromomethane (µg/l) 1 - - 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 - - <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1Dibromochloromethane (µg/l) 1 - - 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 - - <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1

Chloroform (µg/l) 1 12A 2.5A 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 - - <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1Dibromoacetonitrile (µg/l) 1 - - 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 - - <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1Dibromo acetic acid (µg/l) 1 - - 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 - - <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1

Hydrazine (mg/l) 0.10 - - 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 - - <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1Ethanolamine (mg/l) 0.01 - - 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 - - <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01

Morpholine (mg/l) 0.01 - - 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 - - <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01Notes: For calculation of statistics results that were less than the minimum reporting value (MRV) were considered to be zero.Pre-WFD EQS Values taken from Environment Agency Integrated Pollution Prevention and Control (IPPC), Environmental Assessment and Appraisal of BAT, IPPC H1, March 2008.WFD environmental standards for transitional and coastal waters taken from The River Basins Typology, Standards and Groundwater threshold values (Water Framework Directive) (England and Eales) Directions 2009, December 2009.A= Annual AverageT= TotalD = DissolvedP = Percentile

InshoreOffshore

Signifcance difference in means

Inshore

Minimum MaximumInshore Surface Offshore Surface Inshore Mid-depth Offshore Mid-depth Offshore Bottom Inshore Offshore


Expected Organic Discharge Chemicals Units

Offshore

Mean (+/-) St.Dev Overall mean (+/-) St.Dev

Total and Dissolved Metals Units MRV Mean (+/-) St.Dev Overall mean (+/-) St.Dev Overall mean (+/-) St.DevOffshore Bottom Inshore F Test (95% confidence)Offshore T test (95% confidence)

Minimum MaximumInshore Surface Offshore Surface Inshore Mid-depth Offshore Mid-depth Inshore Bottom

General Water Quality Parameters Units


MaximumInshore Surface Offshore Surface Inshore Mid-depth Offshore Mid-depth

MinimumOverall mean (+/-) St.DevF Test (95% confidence)Offshore

InshoreOffshore

Overall mean (+/-) St.Dev

T test (95% confidence)

F Test (95% confidence) T test (95% confidence)

Inshore Bottom Offshore Bottom InshoreMean (+/-) St.Dev Overall mean (+/-) St.Dev

Inshore Bottom



APPENDIX D – Comparison of marine water chemistry under neap and spring tide conditions

Comparison of non-radiochemical water quality results for neap and spring tides

MRVNeap Spring Surface Surface Mid-depth Mid-depth Bottom Bottom Surface Surface Mid-depth Mid-depth Bottom Bottom

Total Arsenic (µg/l) 1 - - 3.4 (+/-) 1.2 3.3 (+/-) 0.5 3.6 (+/-) 1.5 3.4 (+/-) 0.5 3.9 (+/-) 1.5 3.5 (+/-) 0.6 3.6 3.4 <1 2.4 <1 2.3 <1 2.5 6.0 5.0 9.6 4.6 9.0 4.8Total Cadmium (µg/l) 1 - - 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.1 (+/-) 0.5 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 0.02 <1 <1 <1 <1 <1 <1 <1 <1 <1 3.2 <1 <1

Total Chromium (µg/l) 1 - - 0.5 (+/-) 1.0 1.2 (+/-) 2.6 0.5 (+/-) 0.9 2.7 (+/-) 8.0 0.8 (+/-) 1.2 3.1 (+/-) 12.9 0.6 2.3 <1 <1 <1 <1 <1 <1 4.7 16.3 3.9 52.6 5.0 86.1Total Lead (µg/l) 1 - - 0.1 (+/-) 0.4 0.4 (+/-) 0.7 0.4 (+/-) 0.6 0.5 (+/-) 0.7 0.6 (+/-) 0.8 0.6 (+/-) 0.9 0.3 0.5 <1 <1 <1 <1 <1 <1 1.5 2.5 2.2 2.2 2.8 3.1

Total Nickel (µg/l) 1 - - 3.2 (+/-) 2.2 2.9 (+/-) 2.3 3.3 (+/-) 1.9 2.7 (+/-) 1.6 4.1 (+/-) 2.4 3.5 (+/-) 4.6 3.5 3.0 <1 <1 <1 <1 <1 <1 11.0 13.2 7.3 7.8 10.8 32.0Total Copper (µg/l) 1 - - 18.3 (+/-) 10.7 12.6 (+/-) 6.0 18.3 (+/-) 10.6 11.4 (+/-) 4.6 19.4 (+/-) 11.4 12.7 (+/-) 6.2 18.7 12.3 <1 6.2 5.6 5.0 6.4 5.0 47.5 28.1 47.8 27.1 54.0 28.8

Total Zinc (µg/l) 1 - - 40.2 (+/-) 23.8 35.0 (+/-) 26.8 44.1 (+/-) 20.7 32.8 (+/-) 24.2 48.4 (+/-) 24.5 33.4 (+/-) 26.3 44.2 33.7 <1 <1 13.4 <1 7.1 0.0 108.0 123.7 98.0 89.3 116.9 92.3Total Mercury (µg/l) 0.1 - - 0.0 (+/-) 0.0 0.04 (+/-) 0.3 0.0 (+/-) 0.0 0.2 (+/-) 0.9 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 1.9 <0.1 4.1 <0.1 <0.1

Total Iron (µg/l) 5 - - 146.1 (+/-) 82.4 78.4 (+/-) 64.6 172.5 (+/-) 103.8 91.3 (+/-) 65.2 198.2 (+/-) 99.0 109.2 (+/-) 86.9 172.3 93.0 24.7 <5 53.7 8.1 65.1 <5 554.3 375.0 515.3 325.0 571.8 442.8Total Boron (µg/l) 5 - 4162.4 (+/-) 633.7 4020.6 (+/-) 1690.3 4074.1 (+/-) 97.7 3988.4 (+/-) 1739.7 4081.6 (+/-) 93.0 4028.0 (+/-) 1756.0 4106.0 4012.4 3882.0 <5 3861.0 <5 3955.0 <5 7173.0 4231.0 4219.0 4181.0 4259.0 4332.0

Dissolved Arsenic* (µg/l) 1 25AD 25AD 2.0 (+/-) 0.8 2.6 (+/-) 0.4 1.9 (+/-) 1.0 2.6 (+/-) 0.4 2.1 (+/-) 0.8 2.6 (+/-) 0.4 2.0 2.6 <1 1.7 <1 1.7 <1 1.7 3.0 3.8 3.6 3.5 3.4 3.3Dissolved Cadmium* (µg/l) 1 2.5AD 0.2AD and 1.5MAC 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 0.0 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1

Dissolved Chromium* (µg/l) 1 15AD 0.6AD and 32 (95P)1 0.02 (+/-) 0.2 0.02 (+/-) 0.2 0.0 (+/-) 0.0 0.02 (+/-) 0.1 0.02 (+/-) 0.1 0.05 (+/-) 0.2 0.01 0.03 <1 <1 <1 <1 <1 <1 1.2 1.0 <1 1.0 1.0 1.1Dissolved Lead* (µg/l) 5 25AD 7.2AD 0.02 (+/-) 0.2 0.03 (+/-) 0.2 0.02 (+/-) 0.2 0.0 (+/-) 0.0 0.03 (+/-) 0.2 0.0 (+/-) 0.0 0.03 0.01 <5 <5 <5 <5 <5 <5 1.2 1.5 1.2 <5 1.4 <5

Dissolved Nickel* (µg/l) 1 30AD 20AD 0.0 (+/-) 0.0 0.4 (+/-) 0.6 0.1 (+/-) 0.3 0.4 (+/-) 0.8 0.1 (+/-) 0.3 0.3 (+/-) 0.5 0.05 0.34 <1 <1 <1 <1 <1 <1 <1 1.7 1.2 3.9 2.0 1.6Dissolved Copper* (µg/l) 1 5AD 5AD 3.8 (+/-) 3.1 4.5 (+/-) 1.7 3.8 (+/-) 3.4 4.0 (+/-) 2.0 3.9 (+/-) 3.4 3.7 (+/-) 1.5 3.9 4.1 <1 1.8 <1 <1 <1 <1 13.6 8.6 14.1 9.0 13.4 7.0

Dissolved Mercury* (µg/l) 0.1 0.3AD 0.05AD 0.07MAC 0.0 (+/-) 0.0 0.02 (+/-) 0.1 0.0 (+/-) 0.0 0.1 (+/-) 0.4 0.002 (+/-) 0.0 0.0 (+/-) 0.0 0.001 0.036 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 1.0 <0.1 1.9 0.1 <1Dissolved Iron* (µg/l) 5 1000AD 1000AD 13.4 (+/-) 13.1 6.8 (+/-) 10.8 15.3 (+/-) 12.7 12.2 (+/-) 15.2 19.0 (+/-) 13.7 13.2 (+/-) 20.4 15.9 10.7 <5 <5 <5 <5 <5 <5 49.6 46.4 48.8 53.0 51.6 80.0

Dissolved Boron (µg/l) 5 - - 3828.6 (+/-) 117.4 3622.4 (+/-) 232.9 3883.6 (+/-) 424.2 3608.2 (+/-) 269.7 3822.3 (+/-) 205.1 3662.4 (+/-) 263.0 3844.8 3631.0 3600.0 3239.0 3391.0 2538.0 2679.0 3292.0 4021.0 4123.0 6679.0 3996.0 4059.0 4707.0Dissolved Aluminium* (µg/l) 5 - - 18.8 (+/-) 12.3 18.4 (+/-) 26.4 18.4 (+/-) 8.1 23.4 (+/-) 25.2 32.3 (+/-) 36.5 25.5 (+/-) 36.7 23.2 22.4 <5 <5 5.2 <5 8.0 <5 62.0 160.4 38.0 103.6 239.5 174.3

Dissolved Manganese* (µg/l) 5 - - 2.4 (+/-) 3.5 4.2 (+/-) 5.1 2.9 (+/-) 3.6 4.1 (+/-) 5.2 3.1 (+/-) 4.6 4.5 (+/-) 5.2 2.8 4.3 <5 <5 <5 <5 <5 <5 9.4 19.3 10.2 16.4 17.9 18.9Dissolved Lithium (µg/l) 10 - - 113.1 (+/-) 21.9 119.6 (+/-) 33.0 110.5 (+/-) 18.5 117.6 (+/-) 33.2 110.1 (+/-) 25.1 113.7 (+/-) 39.9 111.2 117.0 78.6 57.9 76.3 56.4 <10 <10 161.2 184.0 148.1 178.9 164.2 174.9

Notes: For calculation of statistics results that were less than the minimum reporting value (MRV) were considered to be zero.EQS Values taken from Environment Agency Integrated Pollution Prevention and Control (IPPC), Environmental Assessment and Appraisal of BAT, IPPC H1, March 2008.A= Annual AverageT= TotalD = DissolvedP = Percentile

Comparison of non-radiochemical water quality results for neap and spring tides

MRVNeap Spring Surface Surface Mid-depth Mid-depth Bottom Bottom Surface Surface Mid-depth Mid-depth Bottom Bottom

pH Value* (Units) 6 - 8.5P - 7.9 (+/-) 0.2 7.7 (+/-) 0.2 7.9 (+/-) 0.2 7.8 (+/-) 0.2 7.9 (+/-) 0.2 7.8 (+/-) 0.2 7.9 7.8 7.5 7.2 7.4 7.0 7.4 7.4 8.1 8.0 8.1 8.0 8.1 8.1Sulphate* (mg/l) 1 - - 1977.5 (+/-) 240.8 1851.4 (+/-) 225.9 1962.2 (+/-) 177.5 1876.9 (+/-) 187.1 1970.1 (+/-) 156.2 1889.2 (+/-) 201.6 1969.9 1872.5 1486.3 1259.7 1398.1 1585.9 1588.1 1277.9 2959.9 2349.3 2238.4 2201.5 2297.7 2179.3Chloride* (mg/l) 1 - - 14982.7 (+/-) 1067.8 13547.4 (+/-) 1863.3 14885.9 (+/-) 624.6 13434.2 (+/-) 1751.5 15017.5 (+/-) 470.1 13552.9 (+/-) 1752.2 14962.0 13511.5 12745.5 10871.3 12400.5 10970.9 13935.8 11122.9 20250.8 17271.5 15806.4 15885.3 16322.5 15977.3

Nitrate (mg/l) 1 - - 2.8 (+/-) 0.6 4.8 (+/-) 1.2 2.8 (+/-) 0.6 4.9 (+/-) 1.3 2.7 (+/-) 0.6 4.8 (+/-) 1.2 2.8 4.8 1.3 2.1 1.6 2.0 1.7 2.5 3.8 6.8 3.8 6.9 4.1 6.8Nitrite (mg/l) 0.05 - - 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 0.0 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Ammonium (mg/l) 0.03 - - 0.2 (+/-) 0.1 0.2 (+/-) 0.1 0.2 (+/-) 0.1 0.2 (+/-) 0.1 0.2 (+/-) 0.1 0.1 (+/-) 0.1 0.2 0.2 0.02 0.01 0.03 <0.03 <0.03 <0.03 0.5 0.6 0.3 0.5 0.5 0.4Phosphate (mg/l) 0.02 - - 0.03 (+/-) 0.0 0.04 (+/-) 0.0 0.03 (+/-) 0.0 0.04 (+/-) 0.0 0.03 (+/-) 0.0 0.04 (+/-) 0.0 0.03 0.04 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 0.1 0.1 0.1 0.1 0.1 0.1

Sodium (mg/l) 0.01 - - 9003.0 (+/-) 1532.9 7988.8 (+/-) 1671.6 9138.7 (+/-) 1630.3 7699.4 (+/-) 1751.0 9258.2 (+/-) 1250.3 7987.6 (+/-) 1449.2 9133.3 7891.9 5286.0 5045.0 6205.0 3895.0 6089.0 5262.0 14550.0 11827.5 16070.0 11180.0 13200.0 10650.0Suspended Solids (mg/l) 5 - - 142.4 (+/-) 60.6 197.4 (+/-) 109.3 186.8 (+/-) 75.7 304.2 (+/-) 210.1 225.5 (+/-) 81.6 551.6 (+/-) 461.3 184.9 351.1 38.0 33.0 70.0 86.0 97.0 74.0 309.0 485.0 392.0 1134.0 425.0 1795.0

BOD (mg/l) 2 - - 0.4 (+/-) 1.0 2.2 (+/-) 3.5 0.4 (+/-) 1.0 1.6 (+/-) 2.7 0.4 (+/-) 1.0 2.5 (+/-) 3.4 0.4 2.1 <2 <2 <2 <2 <2 <2 4.0 12.8 3.0 11.2 4.0 14.4COD (mg/l) 2 - - 9.6 (+/-) 5.4 18.8 (+/-) 18.0 9.5 (+/-) 5.2 16.3 (+/-) 16.5 11.0 (+/-) 5.2 21.1 (+/-) 27.2 10.0 18.7 <2 3.6 <2 <2 <2 2.5 21.0 90.0 20.0 99.0 21.0 169.0

Orthophosphate (mg/l) 0.02 - - 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 0.0 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02Salinity (ppt) 1 - - 31.8 (+/-) 0.5 28.6 (+/-) 4.1 31.9 (+/-) 0.5 28.7 (+/-) 4.0 31.9 (+/-) 0.5 28.8 (+/-) 4.0 31.9 28.7 31.1 23.3 31.0 23.3 31.2 23.4 32.7 33.0 32.8 33.3 32.9 33.3

Turbidity (NTU) 2 - - 155.0 (+/-) 61.4 199.3 (+/-) 105.3 187.1 (+/-) 65.0 248.2 (+/-) 130.7 227.8 (+/-) 73.9 273.2 (+/-) 164.7 190.0 237.1 60.0 80.0 80.0 <2 110.0 <2 300.0 440.0 380.0 500.0 400.0 500.0Silicates (µg/l) 5 - - 0.002 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.004 (+/-) 0.0 0.0 (+/-) 0.0 0.002 0.0 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5 <5

Free Chlorine (mg/l) 0.10 - - 0.0 (+/-) 0.0 0.01 (+/-) 0.1 0.002 (+/-) 0.0 0.01 (+/-) 0.0 0.01 (+/-) 0.0 0.01 (+/-) 0.0 0.00 0.01 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 0.3 0.1 0.2 0.2 0.2Total Petroleum Hydrocarbons (µg/l) 10.00 - - 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.00 0.00 <10 <10 <10 <10 <10 <10 <10 <10 0.0 0.0 0.0 0.0

Kjeldahl Nitrogen (mg/l) 0.10 - - 0.3 (+/-) 0.1 0.3 (+/-) 0.2 0.3 (+/-) 0.1 0.3 (+/-) 0.1 0.4 (+/-) 0.1 0.4 (+/-) 0.2 0.3 0.3 0.1 0.1 0.1 <0.1 0.2 <0.1 0.5 0.7 0.5 0.5 0.6 0.6Non Ionic Detergents (mg/l) 0.10 - - 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 0.0 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1

Cationic Detergents (mg/l) 0.10 - - 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 0.0 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1Trihalomethanes (µg/l) 1 - - 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 0.0 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1Dichloromethane (µg/l) 1 - 20A 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 0.0 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1

Dichlorobromomethane (µg/l) 1 - - 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 0.0 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1Dibromochloromethane (µg/l) 1 - - 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 0.0 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1

Chloroform (µg/l) 1 12A 2.5A 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 0.0 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1Dibromoacetonitrile (µg/l) 1 - - 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 0.0 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1Dibromo acetic acid (µg/l) 1 - - 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 0.0 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1

Hydrazine (mg/l) 0.10 - - 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 0.0 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1Ethanolamine (mg/l) 0.01 - - 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 0.0 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01

Morpholine (mg/l) 0.01 - - 0.0 (+/-) 0.0 0.0 (+/-) 0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 (+/-) 0.0 0.0 0.0 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01Notes: For calculation of statistics results that were less than the minimum reporting value (MRV) were considered to be zero.EQS Values taken from Environment Agency Integrated Pollution Prevention and Control (IPPC), Environmental Assessment and Appraisal of BAT, IPPC H1, March 2008.A= Annual AverageT= TotalD = DissolvedP = Percentile

MaximumOverall Mean Overall Mean MinimumWFD EQSDeterminand Units Saltwater EQS Surface Bottom

Mean (+/-) St. Devno of samples = 45 samples / layer for spring tides and 50 samples / layer for neap tidesSurface Bottom Bottom

Bottom

Mean (+/-) St. Dev

MaximumOverall Mean Overall Mean MinimumDeterminand Units Pre-Saltwater EQS Surface

WFD EQS

Spring TideNeap Tide

Spring TideNeap Tide

no of samples = 45 samples / layer for spring tides and 50 samples / layer for neap tides

Mid-depth

Mid-depth

Mid-depth

Mid-depthSurface



Appendix E – Replicate water sample data

Quality Assurance Sample - Campaign 1

Determinand Units

Surface (0.5m) Replicate (0.5m) Surface (0.5m) Replicate (0.5m)Total Arsenic (µg/l) 2.56 2.76 3.12 3.39

Total Cadmium (µg/l) <1 <1 <1 <1Total Chromium (µg/l) <1 <1 <1 1.12

Total Lead (µg/l) <1 1.15 <1 1.09Total Nickel (µg/l) 2.36 2.70 1.26 1.51

Total Copper (µg/l) 7.22 8.35 6.21 6.47Total Zinc (µg/l) 19.7 23.2 21.1 33.2

Total Mercury (µg/l) <0.1 <0.1 <0.1 <0.1Total Iron (µg/l) 120 144 36.0 45.0

Total Boron (µg/l) - - - -

Dissolved Arsenic (µg/l) 2.26 2.44 2.58 2.56Dissolved Cadmium (µg/l) <1 <1 <1 <1

Dissolved Chromium (µg/l) <1 <1 <1 <1Dissolved Lead (µg/l) <1 <1 <1 <1

Dissolved Nickel (µg/l) <1 1.29 1.23 <1Dissolved Copper (µg/l) 4.82 5.49 5.97 5.13

Dissolved Mercury (µg/l) <0.1 <0.1 <0.1 <0.1Dissolved Iron (µg/l) <5 <5 15.0 33.2

Dissolved Boron (µg/l) 3277 3322 3257 3421Dissolved Aluminium (µg/l) 15.0 12.0 28.0 53.1

Dissolved Manganese (µg/l) 13.7 16.7 8.30 10.2Dissolved Lithium (µg/l) 142 144 136 128


Determinand Units

Surface (0.5m) Replicate (0.5m) Surface (0.5m) Replicate (0.5m)pH Value (Units) 7.32 7.44 7.25 7.81Sulphate (mg/l) 1724 1658 1656 1685Chloride (mg/l) 11757 11788 12097 11930

Nitrate (mg/l) 5.72 5.85 6.14 6.32Nitrite (mg/l) <0.1 <0.1 <0.1 <0.1

Ammonium (mg/l) 0.08 0.11 0.27 <0.01Phosphate (mg/l) <5 <5 <5 <5

Sodium (mg/l) 7240 7333 5045 8506Suspended Solids (mg/l) 236 256 329 360

BOD (mg/l) <2 <2 8.00 <2COD (mg/l) 12.0 15.0 26.0 16.0

Orthophosphate (mg/l) <0.02 <0.02 <0.02 <0.02Salinity (ppt) 24.2 24.2 24.4 24.5

Turbidity (NTU) 220 200 300 280Silicates (µg/l) <5 <5 <5 <5

Free Chlorine (mg/l) <0.1 <0.1 <0.1 <0.1Total Petroleum Hydrocarbons (µg/l) <10 <10 <10 <10

Non Ionic Detergents (mg/l) <0.1 <0.1 <0.1 <0.1Cationic Detergents (mg/l) <0.1 <0.1 <0.1 <0.1

Trihalomethanes (µg/l) <1 <1 <1 <1Dichloromethane (µg/l) <1 <1 <1 <1

Dichlorobromomethane (µg/l) <1 <1 <1 <1Dibromochloromethane (µg/l) <1 <1 <1 <1

Chloroform (µg/l) <1 <1 <1 <1Dibromoacetonitrile (µg/l) <1 <1 <1 <1Dibromo acetic acid (µg/l) <1 <1 <1 <1

Hydrazine (mg/l) <0.1 <0.1 <0.1 <0.1Ethanolamine (mg/l) <0.01 <0.01 <0.01 <0.01

Morpholine (mg/l) <0.01 <0.01 <0.01 <0.01

Sampling location reference and sampling depth


SAMPLE LOCATION N SAMPLE LOCATION J





Determinand Units

Surface (0.5m) Replicate (0.5m) Surface (0.5m) Replicate (0.5m)Total Arsenic (µg/l) 4.7 2.2 <1 3.0

Total Cadmium (µg/l) <1 <1 <1 <1Total Chromium (µg/l) <1 <1 <1 <1

Total Lead (µg/l) <1 <1 <1 <1Total Nickel (µg/l) 4 4 6 8


Total Mercury (µg/l) <0.1 <0.1 <0.1 <0.1Total Iron (µg/l) 107 116 42.2 58.1

Total Boron (µg/l) - - - -

Dissolved Arsenic (µg/l) 1.0 1.9 <1 2Dissolved Cadmium (µg/l) <1 <1 <1 <1

Dissolved Chromium (µg/l) <1 <1 <1 <1Dissolved Lead (µg/l) <1 <1 1 <1

Dissolved Nickel (µg/l) <1 <1 <1 1.7Dissolved Copper (µg/l) 3 9 9 5

Dissolved Mercury (µg/l) <0.1 <0.1 <0.1 <0.1Dissolved Iron (µg/l) 22.4 33.8 12.0 45.9


Dissolved Manganese (µg/l) 5 6 <5 8Dissolved Lithium (µg/l) 123 110 109 154


Determinand Units



Ammonium (mg/l) 0.20 0.20 0.11 0.10Phosphate (mg/l) <5 <5 <5 <5

Sodium (mg/l) 11070 7572 8361 10770Suspended Solids (mg/l) 184 148 102 97.0

BOD (mg/l) <2 <2 <2 <2COD (mg/l) 8 10.0 3 8


Turbidity (NTU) 175 170 130 140Silicates (µg/l) <5 <5 <5 <5

Free Chlorine (mg/l) <0.1 <0.1 <0.1 <0.1Total Petroleum Hydrocarbons (µg/l) <10 <10 <10 <10

Non Ionic Detergents (mg/l) <0.1 <0.1 <0.1 <0.1Cationic Detergents (mg/l) <0.1 <0.1 <0.1 <0.1

Trihalomethanes (µg/l) <0.1 <0.1 <1 <1Dichloromethane (µg/l) <1 <1 <1 <1




Morpholine (mg/l) <0.01 <0.01 <0.01 <0.01



SAMPLE LOCATION N


SAMPLE LOCATION J




Determinand Units


Total Cadmium (µg/l) <1 <1 <1 <1Total Chromium (µg/l) 1 <1 <1 <1

Total Lead (µg/l) 1 1.2 <1 <1Total Nickel (µg/l) 3 1 4 2

Total Copper (µg/l) 12.0 16.5 16.0 10.4Total Zinc (µg/l) 40.0 12.5 6 <5

Total Mercury (µg/l) <0.1 <0.1 <0.1 <0.1Total Iron (µg/l) 53.8 <5 13.3 11.5

Total Boron (µg/l) 3908 4037 4169 4013

Dissolved Arsenic (µg/l) 2.8 3.0 2.8 3Dissolved Cadmium (µg/l) <1 <1 <1 <1

Dissolved Chromium (µg/l) <1 <1 <1 <1Dissolved Lead (µg/l) <1 <1 <1 <1

Dissolved Nickel (µg/l) <1 1.1 <1 <1Dissolved Copper (µg/l) 5 2 7 3

Dissolved Mercury (µg/l) <0.1 <0.1 <0.1 <0.1Dissolved Iron (µg/l) 13.7 <5 <5 <5


Dissolved Manganese (µg/l) <5 <5 <5 <5Dissolved Lithium (µg/l) 101 102 67.0 88.8


Determinand Units



Ammonium (mg/l) 0.06 0.34 0.12 0.32Phosphate (mg/l) 0 0.07 0.1 0

Sodium (mg/l) 10460 7667 10301 8152Suspended Solids (mg/l) 258 150 134 128

BOD (mg/l) <2 <2 2 <2COD (mg/l) 4 10.0 12.0 10.0


Turbidity (NTU) 190 85.0 100 80.0Silicates (µg/l) <0.1 <0.1 <0.1 <0.1

Free Chlorine (mg/l) <5 <5 <5 <5Kjeldahl Nitrogen (mg/l) <10 <10 <10 <10

Total Petroleum Hydrocarbons (µg/l) 0 0 0.3 0Non Ionic Detergents (mg/l) <0.1 <0.1 <0.1 <0.1

Cationic Detergents (mg/l) <0.1 <0.1 <0.1 <0.1Trihalomethanes (µg/l) <1 <1 <1 <1Dichloromethane (µg/l) <1 <1 <1 <1




Morpholine (mg/l) <0.01 <0.01 <0.01 <0.01



SAMPLE LOCATION QSAMPLE LOCATION D


SAMPLE LOCATION D


SAMPLE LOCATION Q


Determinand Units


Total Cadmium (µg/l) <1 <1 <1 <1Total Chromium (µg/l) <1 <1 1.4 <1

Total Lead (µg/l) <1 <1 1 <1Total Nickel (µg/l) 3 3 5 1


Total Mercury (µg/l) <0.1 <0.1 <0.1 <0.1Total Iron (µg/l) 110 103 136 77

Total Boron (µg/l) 3918 3940 4001 4050

Dissolved Arsenic (µg/l) 2.5 2.5 2.41 2.41Dissolved Cadmium (µg/l) <1 <1 <1 <1

Dissolved Chromium (µg/l) <1 <1 1 <1Dissolved Lead (µg/l) <1 <1 <1 <1

Dissolved Nickel (µg/l) <1 <1 <1 <1Dissolved Copper (µg/l) 2 2 1.92 2.36

Dissolved Mercury (µg/l) <0.1 <0.1 <0.1 <0.1Dissolved Iron (µg/l) <5 <5 <5 <5

Dissolved Boron (µg/l) 3724 3790 3942 3826Dissolved Aluminium (µg/l) 6 6 7.54 11.2

Dissolved Manganese (µg/l) <5 <5 <5 <5Dissolved Lithium (µg/l) 121 135 86.0 98.0


Determinand Units



Ammonium (mg/l) 0.16 0.20 0.16 0.16Phosphate (mg/l) <0.02 <0.02 0 0

Sodium (mg/l) 8768 8549 9591 9998Suspended Solids (mg/l) 165 175 74.0 62.0

BOD (mg/l) <2 2.00 <2 <2COD (mg/l) 16 15.0 <2 15.0

Orthophosphate (mg/l) <0.02 <0.02 0.02 <0.02Salinity (ppt) 32.1 32.4 31.6 31.5

Turbidity (NTU) 170 180 80.0 100Silicates (µg/l) <0.1 <0.1 <0.1 <0.1

Free Chlorine (mg/l) <5 <5 <5 <5Kjeldahl Nitrogen (mg/l) <10 <10 <10 <10

Total Petroleum Hydrocarbons (µg/l) 0.22 0 0.3 0Non Ionic Detergents (mg/l) <0.1 <0.1 <0.1 <0.1

Cationic Detergents (mg/l) <0.1 <0.1 <0.1 <0.1Trihalomethanes (µg/l) <1 <1 <1 <1Dichloromethane (µg/l) <1 <1 <1 <1




Morpholine (mg/l) <0.01 <0.01 <0.01 <0.01

SAMPLE LOCATION B SAMPLE LOCATION L


SAMPLE LOCATION B


SAMPLE LOCATION L





APPENDIX F – Profile graphs of In-situ water quality measurements

Profile K

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Profile F Profile F Profile F

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date: st1 september 2010 our ref: 15011/tn/00103 your ref ...... · positioning system (dgps)...

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