GROUNDWATER MONITORING AT FORMER FCC SITE, MAPUA FEBRUARY 2010 SAMPLING UPDATE

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1 PTTLE DELMORE PRTNERS LTD Level 2, Radio New Zealand House 51 Chester Street West Christchurch PO Box 389, Christchurch, New Zealand Tel: Fax: Web Site uckland Wellington Christchurch solutions for your environment π π 19 March 21 Ms Jenny Easton Tasman District Council Private Bag 4 RICHMOND 75 Dear Jenny GROUNDWTER MONITORING T FORMER FCC SITE, MPU FEBRURY 21 SMPLING UPDTE The February sampling round has incorporated all the new monitoring bores that have been drilled at the site, which for the more recently drilled bores, represents their second sampling round. This letter provides our usual summary of the trends in the bores that are routinely monitored and then comments on the patterns across the site in the more recently drilled bores. s recommended in the site audit report, it is proposed that the network of new on-site monitoring bores should be sampled at quarterly intervals for one year. Therefore, at the completion of that 12 month period we will prepare a full groundwater review report which will include recommendations for the ongoing monitoring requirements. Consequently, this current letter should be treated as an interim update on the latest monitoring results. The groundwater sampling that is the subject of this letter review was carried out by TDC between 9-11 February 21. Regularly Sampled Wells The results in the regularly sampled wells have been compared with the previous sampling that has been carried out at the site, which prior to December 27 had been arranged by MfE. series of plots have been attached to this letter to highlight the major trends in those bores that were included in the latest sampling round. Figure 1 shows the location of the sampled boreholes that are referred to in this letter. BH1 and BH2 are upgradient of the eastern groundwater discharge to the Mapua channel. BH5 and BH9 are upgradient of the south-western groundwater discharge into the Waimea Inlet. The bore at 13 Tahi Street is the nearest private bore downgradient of the site. Earlier sampling that was carried out in January and pril 28 has included three nearby pairs of boreholes: BH1/BH1, BH5/BH5 and BH9/BH9. On the plots that follow, the points from these adjacent boreholes have been joined by a vertical line to indicate how similar or different they are. In the plots for the latest sampling round, the only data shown is from boreholes BH1, BH2, BH5, BH9 and 13 Tahi Street. The following comments relate to the trends that are apparent from the most recent round of groundwater monitoring. π Figure 2 shows nitrate-nitrogen concentrations. Three boreholes have historically shown elevated concentrations: BH2, BH5 and BH9. Since late 27, concentrations have decreased significantly in BH2 and BH9, which both had concentrations of less than 2 g/m³ in November 29. BH5 continues to show elevated concentrations. In the latest sampling round, these three bores have shown an increase in nitrate-nitrogen, with CJ4163L8_Feb_21_PDF.doc, 19/3/21

2 PTTLE DELMORE PRTNERS LIMITED 2 GROUNDWTER MONITORING T FORMER FCC SITE, MPU FEBRURY 21 SMPLING UPDTE the increase being greatest in BH5, less in BH2 and smallest in BH9, although all three bores in February 21 had nitrate-n concentrations above the Maximum cceptable Value in the Drinking Water Standards for New Zealand 25 Revised 28. Figure 2a shows the boreholes that have typically displayed lower nitrate-n concentrations. Both BH1 and 13 Tahi Street remain at stable, low concentrations. π Figure 3 shows ammonia-nitrogen concentrations. The bores with elevated concentrations BH1 and BH2 have shown a small increase in the latest sampling round, and are relatively stable at concentrations that are well below previously measured peak concentrations. Those bores with lower ammonia-n concentrations Figure 3a show decreasing or stable concentrations in BH5 and 13 Tahi Street, and a small increase in BH9. π Figure 4 shows phosphorous concentrations, which continue to show stable concentrations compared to previous sampling. The most elevated concentrations occur in BH2 and BH5. π Figure 5 shows DDX concentrations. The bores with elevated concentrations showed a decrease in BH1 and BH2, with stable concentrations in BH5, BH9 and 13 Tahi Street. Non-detectable DDX concentrations have continued at 13 Tahi Street. π Figure 6 shows DL concentrations. These concentrations have shown a relatively stable trend, with decreases in BH1, BH2, BH5 and 13 Tahi Street, and a slight increase in BH9. π Figure 7 shows electrical conductivity values, which are a general indicator of all the chemicals dissolved in the water. These show a relatively stable or decreasing pattern with the exception of an increase in BH2. π Figure 8 shows dissolved copper concentrations. Copper was one of the reagents used in the MCD process. The results show generally stable concentrations, with a small increase in BH9. π Iron was utilised in the MCD process, but has only been sampled since January 28. However, there are now sufficient measurements to present the data in a time series plot, which is shown in Figure 9. Detectable concentrations only occur in BH1 and have shown a significant decrease. The most recent sampling round has occurred during a time of lower summertime water levels, as indicated by the plot in Figure 1. With the exception of nitrate-nitrogen Figure 2, and to a lesser extent, ammonia-n Figure 3, the general trend has been one of stable and slightly improving groundwater quality. Piezometric Survey The elevation of the groundwater table within the on-site monitoring bores was measured on 9 February 21, and the resulting contours are plotted in Figure 11. They show that levels are lower than at the time of the last survey in November 29, but a similar pattern of groundwater flow occurs beneath the site, with most of the groundwater discharging either to the Mapua channel to the east, or the Waimea Inlet to the south-west. Sampling of dditional Wells The sampling of the additional on-site wells during February 21 also allows a more detailed picture of the distribution of chemicals within the area to be defined. Figures have been prepared to show the patterns that exist. π Nitrate-Nitrogen Figure 12 shows the nitrate-nitrogen concentrations, which have been colour coded as follows: - green less than half the Maximum cceptable Value MV in the Drinking Water Standards <5.7 mg/l; - orange between half the MV and the full MV of 11.3 mg/l; - red greater than the MV. CJ4163L8_Feb_21_PDF.doc, 19/3/21

3 PTTLE DELMORE PRTNERS LIMITED 3 GROUNDWTER MONITORING T FORMER FCC SITE, MPU FEBRURY 21 SMPLING UPDTE Whilst there is some significant variability in individual boreholes compared to the November 29 sampling, the general pattern across the site is similar, with low nitrate concentrations generally occurring within the eastern part of the site. More elevated nitrate-nitrogen concentrations occur within the western portion of the site up to 47 mg/l in BH11. This bore is located adjacent to the clay bund around a former landfill area. Indication of seepage into the Waimea Inlet from nearby boreholes have elevated concentrations 8 mg/l in BH3 and 24 mg/l in BH5, whereas seepage into the Waimea channel along the eastern side boundary has much lower concentrations. π mmonia-nitrogen Figure 13 shows the ammonia-nitrogen concentrations, which have been colour coded as follows: - green less than the aesthetic guideline value in the Drinking Water Standards <.3 mg/l; - orange between the aesthetic guideline value in the Drinking Water Standards and a significantly elevated value of 1 mg/l of aquatic ecosystems; - red above a significantly elevated value of 1 mg/l. The results show elevated concentrations occur in both the east and west of the site, with the highest concentration of 2,1 mg/l occurring at BH11. The seepage samples indicate elevated ammonia-n concentrations in the east entering the Mapua channel, but much lower concentrations in the west adjacent to the Waimea Inlet. The ammonia-n concentrations indicate some areas of the site have significantly higher concentrations than the values measured in the regularly monitored bores. π Total Nitrogen Figure 14 shows the total Nitrogen concentrations, which have been colour coded as follows: - green less than 1 mg/l, which is above the NZECC guideline value for marine water of.12 mg/l; - orange between 1 and 2 mg/l; - red greater than 2 mg/l. The results indicate that the vast majority of on-site wells have elevated nitrogen concentrations. π Dissolved Reactive Phosphorous Phosphorous is the other nutrient in addition to nitrogen that contributes to algal growth problems in surface waterways. Diammonium phosphate was used as one of the re-agents used in the remediation process along with urea. Figure 15 shows the DRP concentrations, which have been colour coded as follows: - green less than the NZECC guideline value for marine water <.1 mg/l; - orange between the NZECC guideline value and one hundred times the NZECC guideline value; - red more than 1 times above the NZECC guideline value >1. mg/l. Variable concentrations occur across the site, with some low and non-detectable values, and the bores showing localised high concentrations up to 44 mg/l at BH11. The eastern seepage sample showed DRP at.88 mg/l above NZECC guidelines, and the south-western boreholes adjacent to the Waimea Inlet have variable concentrations up to 1.5 mg/l in BH5. π DDX Figure 16 shows the DDX concentrations, which have been colour coded as follows: - green close to or less than the laboratory detection limit <.6 mg/l; CJ4163L8_Feb_21_PDF.doc, 19/3/21

4 PTTLE DELMORE PRTNERS LIMITED 4 GROUNDWTER MONITORING T FORMER FCC SITE, MPU FEBRURY 21 SMPLING UPDTE - orange greater than the laboratory detection limit and below the MV in the Drinking Water Standards; - red greater than the MV in the Drinking Water Standards >.1 mg/l. The results show variable DDX concentrations within the site. The variation in concentrations within the site is most likely due to the localised effects of soils with elevated DDX concentrations. π DL Figure 17 shows the DL concentrations, which have been colour coded as follows: - green close to or less than the laboratory detection limit <.6 mg/l; - orange above the laboratory detection limit but below a value midway between the MV in the Drinking Water Standards for aldrin and diedlrin and the MV for lindane; - red elevated concentrations above.1 g/m³. s with DDX, the results show variable concentrations within the site. π Rinsate Blank With regard to the DDX and DL analyses, it is important to consider an issue that has arisen through one of the quality assurance checks that was undertaken during sampling. s part of the sampling procedure, a series of blank samples were collected to check that the water or equipment that is used in the sampling process is not causing a cross-contamination problem. In this sampling round, the rinsate blank indicated some carry over of 4, 4 -DDD, Lindane and Dieldrin between samples. Figure 18 has been prepared to show the concentrations of these chemicals that occurred on the day when the rinsate blank was collected in the order that sampling occurred. The pattern shown by this plot indicates that the concentrations in the rinsate blank were very low within 4% of the detection limit. Samples before and after the collection of the rinsate blank had significantly higher concentrations of DDX and DL, so there was no significant effect from the detection of the rinsate blank. However, the detections in the rinsate blank indicate that it is possible that some of the very low detections of DDX or DL could be affected by some carry over from previously sampled wells, although in terms of the patterns shown in Figures 16 and 17, these would still be classified as green dots i.e. low concentrations. To avoid any uncertainty regarding this issue, it is important to implement very thorough cleaning of equipment between wells, and it is recommended that the order of sample collection should generally be from wells with low concentrations of DDX and DL being sampled first, through to wells with the highest concentrations of DDX and DL being sampled last. It is also recommended that the collection and analysis of field blanks, rinsate water blanks and rinsate blanks should be continued to provide a check on this issue. π Conductivity Figure 19 shows the pattern of electrical conductivity values in the groundwater. This is a general indication of all the chemicals dissolved in the groundwater. The following colour coding has been used: - green typical background values <3mS/m; - orange moderately elevated values 3-1 ms/m; - red highly elevated values >1 ms/m. This plot demonstrates that generally elevated values that occur beneath the site. π Copper Figure 2 shows the pattern of copper concentrations, which have been colour coded as follows: - green less than the NZECC guideline value for protection of 95% of species in marine water <.13 mg/l; CJ4163L8_Feb_21_PDF.doc, 19/3/21

5 PTTLE DELMORE PRTNERS LIMITED 5 GROUNDWTER MONITORING T FORMER FCC SITE, MPU FEBRURY 21 SMPLING UPDTE - orange between the NZECC guideline value and ten times the NZECC guideline value; - red greater than 1 times above the NZECC guideline value. The results show low to moderate concentrations generally occur within the groundwater beneath the site, with only two significant hot spots at BH11 and BH18. The eastern seepage sample showed copper concentrations above the NZECC guideline values. π Iron Figure 21 shows the pattern of iron concentrations in the groundwater, which have been colour coded as follows: - green below the laboratory detection limit <.2 mg/l; - orange above the laboratory detection limit, but below the aesthetic guideline value in the Drinking Water Standards; - red greater than the aesthetic guideline value in the Drinking Water Standards >.2 mg/l. The results show generally low concentration across the site, although three significantly higher values occurred at BHG 6 mg/l, BH mg/l and BH mg/l. Overview The patterns shown in Figures indicate a continuing impact from the site soils on the underlying groundwater. In particular: π nitrogen mostly nitrate in the west and ammonia in the east; π DDX; π DL. Isolated occurrences of elevated concentrations of phosphorous, copper and iron also occur within the site. In general terms, the pattern of chemical occurrence is similar to the pattern shown in November 29, although there is some considerable variability shown at individual wells. The long-term regularly measured wells plotted in Figures 2-9 have shown a generally stable or decreasing trend, with the exception of the nitrogen species, which have shown some increases in both nitrate BH2, BH5 and BH9 and ammonia BH1 and BH2. We trust you find these comments helpful. Please contact us if you wish to discuss any of the information contained in this letter. Yours sincerely PTTLE DELMORE PRTNERS LIMITED Peter Callander Encl. CJ4163L8_Feb_21_PDF.doc, 19/3/21

6 RNUI ROD IW STREET FCC WEST THI STREET FCC EST BH1 BH2 13 THI BH5 BH9 KEY BH1 13 THI On site monitoring wells Private wells Site Boundary Source: Cadastral information derived from LINZ data. CJ4163D1.dwg Jun-9 Figure 1 : LOCTION OF REGULRLY MONITORED WELLS PPROX. SCLE 1:25 4

7 J:\CJ4-449\CJ416\3\G_Graphics\February 1\CJ4163G2_Fig2.Doc Figure 2. Nitrate-N MV DWSNZ 11.3 NO 3 -N g/m 3 May-5 Jul-5 ug-5 Oct-5 Dec-5 Mar-6 May-6 Jul-6 May-9 Sep-6 Nov-6 Jan-7 Mar-7 May-7 Jul-7 Sep-7 Nov-7 Jan-8 Mar-8 May-8 Jul-8 Sep-8 Nov-8 Jan-9 Mar-9 Jul-9 Sep-9 Nov-9 Jan-1 Mar-1 May-1 GROUNDWTER MONITORING T MPU BH1 BH2 BH5 BH9 13 Tahi St MV Date PTTLE DELMORE PRTNERS LTD Nitrate-N g/m 3

8 J:\CJ4-449\CJ416\3\G_Graphics\February 1\CJ4163G2_Fig2a.Doc Figure 2a. Nitrate-N MV DWSNZ 11.3 NO 3 -N g/m 3 May-5 Jul-5 ug-5 Oct-5 Dec-5 Mar-6 May-6 Jul-6 Sep-6 Nov-6 Jan-7 Mar-7 May-7 Jul-7 Sep-7 Nov-7 Jan-8 Mar-8 May-8 Jul-8 Sep-8 Nov-8 Jan-9 Mar-9 May-9 Jul-9 Sep-9 Nov-9 Jan-1 Mar-1 May-1 GROUNDWTER MONITORING T MPU BH1 13 Tahi St MV Date PTTLE DELMORE PRTNERS LTD Nitrate-N g/m 3

9 GROUNDWTER MONITORING T MPU Figure 3. mmonia-n GV esthetic DWSNZ.3 NH 3 -N g/m 3 ; quatic Ecosystem Guideline.71g/m 3 BH1 BH2 BH5 BH9 13 Tahi St Sep-5 Nov-5 Jan-6 Mar-6 May-6 Jul-6 Sep-6 Nov-6 Jan-7 Mar-7 May-7 Jul-7 Sep-7 Nov-7 Jan-8 Mar-8 May-8 Jul-8 Sep-8 Nov-8 Jan-9 Mar-9 May-9 Jul-9 Sep-9 Nov-9 Jan-1 Mar-1 May-1 mmonia-n g/m 3 Date PTTLE DELMORE PRTNERS LTD J:\CJ4-449\CJ416\3\G_Graphics\February 1\CJ4163G2_Fig3.Doc

10 J:\CJ4-449\CJ416\3\G_Graphics\February 1\CJ4163G2_Fig3a.Doc Figure 3a. mmonia-n GV esthetic DWSNZ.3 NH 3 -N g/m 3 Sep-5 Nov-5 Jan-6 Mar-6 May-6 Jul-6 Sep-6 Nov-6 Jan-7 Mar-7 May-7 Jul-7 Sep-7 Nov-7 Jan-8 Mar-8 May-8 Jul-8 Sep-8 Nov-8 Jan-9 Mar-9 May-9 Jul-9 Sep-9 Nov-9 Jan-1 Mar-1 May-1 GROUNDWTER MONITORING T MPU BH9 13 Tahi St BH5 Date PTTLE DELMORE PRTNERS LTD mmonia-n g/m 3

11 J:\CJ4-449\CJ416\3\G_Graphics\February 1\CJ4163G2_Fig4.Doc Figure 4. Phosphorous quatic Ecosystem Guideline.1g/m 3 Jun-5 ug-5 Oct-5 Dec-5 Jan-6 pr-6 Jun-6 ug-6 Oct-6 Dec-6 Feb-7 pr-7 Jun-7 ug-7 Oct-7 Dec-7 Feb-8 pr-8 Jun-8 ug-8 Oct-8 Dec-8 Feb-9 pr-9 Jun-9 ug-9 Oct-9 Dec-9 Feb-1 pr-1 GROUNDWTER MONITORING T MPU BH1 BH2 BH5 BH9 13 Tahi St Date PTTLE DELMORE PRTNERS LTD Phosphorous g/m 3

12 J:\CJ4-449\CJ416\3\G_Graphics\February 1\CJ4163G2_Fig5.Doc Figure 5. DDX g/m 3 Sep-4 Nov-4 Jan-5 Mar-5 May-5 Jul-5 Sep-5 Nov-5 Jan-6 Mar-6 May-6 Jul-6 Sep-6 Nov-6 Jan-7 Mar-7 May-7 Jul-7 Sep-7 Nov-7 Jan-8 Mar-8 May-8 Jul-8 Sep-8 Nov-8 Jan-9 Mar-9 May-9 Jul-9 Sep-9 Nov-9 Jan-1 Mar-1 GROUNDWTER MONITORING T MPU BH1 BH2 BH5 BH9 13 Tahi St Date PTTLE DELMORE PRTNERS LTD DDX g/m 3

13 J:\CJ4-449\CJ416\3\G_Graphics\February 1\CJ4163G2_Fig6.Doc Figure 6. DL g/m 3 Nov-4 Jan-5 Mar-5 May-5 Jul-5 Sep-5 Nov-5 Jan-6 Mar-6 May-6 Jul-6 Sep-6 Nov-6 Jan-7 Mar-7 May-7 Jul-7 Sep-7 Nov-7 Jan-8 Mar-8 May-8 Jul-8 Sep-8 Nov-8 Jan-9 Mar-9 May-9 Jul-9 Sep-9 Nov-9 Jan-1 Mar-1 GROUNDWTER MONITORING T MPU BH1 BH2 BH5 BH9 13 Tahi St Date PTTLE DELMORE PRTNERS LTD DL g/m 3

14 J:\CJ4-449\CJ416\3\G_Graphics\February 1\CJ4163G2_Fig7.Doc Figure 7. Conductivity u mhos/cm ug-4 Oct-4 Dec-4 Feb-5 pr-5 Jun-5 ug-5 Oct-5 Dec-5 Feb-6 pr-6 Jun-6 ug-6 Oct-6 Dec-6 Feb-7 pr-7 Jun-7 ug-7 Oct-7 Dec-7 Feb-8 pr-8 Jun-8 ug-8 Oct-8 Dec-8 Mar-9 May-9 Jul-9 Sep-9 Nov-9 Jan-1 Mar-1 GROUNDWTER MONITORING T MPU BH1 BH2 BH5 BH9 13 Tahi St Date PTTLE DELMORE PRTNERS LTD Conductivity u mhos/cm

15 J:\CJ4-449\CJ416\3\G_Graphics\February 1\CJ4163G2_Fig8.Doc Figure 8. Copper MV DWSNZ 2 g/m 3, NZECC Marine Guideline =.13 g/m 3 Sep-4 Nov-4 Jan-5 Mar-5 May-5 Jul-5 Sep-5 Nov-8 Nov-5 Jan-6 Mar-6 May-6 Jul-6 Sep-6 Nov-6 Jan-7 Mar-7 May-7 Jul-7 Sep-7 Nov-7 Jan-8 Mar-8 May-8 Jul-8 Sep-8 Jan-9 Mar-9 May-9 Jul-9 Sep-9 Nov-9 Jan-1 Mar-1 GROUNDWTER MONITORING T MPU BH1 BH2 BH5 BH9 Date PTTLE DELMORE PRTNERS LTD Copper g/m 3

16 J:\CJ4-449\CJ416\3\G_Graphics\February 1\CJ4163G2_Fig9.Doc Figure 9. Iron esthetic Guideline Value DWSNZ.2 g/m 3 Jan-8 Jan-8 Mar-8 Mar-8 pr-8 May-8 Jun-8 Jul-8 ug-8 Sep-8 Oct-8 Nov-8 Dec-8 Jan-9 Feb-9 Mar-9 pr-9 May-9 Jun-9 Jul-9 ug-9 Sep-9 Oct-9 Nov-9 Dec-9 Jan-1 Feb-1 Mar-1 GROUNDWTER MONITORING T MPU BH1 BH2 BH5 BH9 13 Tahi St Date PTTLE DELMORE PRTNERS LTD Iron g/m 3

17 J:\CJ4-449\CJ416\3\G_Graphics\February 1\CJ4163G2_Fig1.Doc Figure 1. Water Level Plot Sep-4 Nov-4 Jan-5 Mar-5 May-5 Jul-5 Sep-5 Nov-5 Jan-6 Mar-6 May-6 Jul-6 Sep-6 Nov-6 Jan-7 Mar-7 May-7 Jul-7 Sep-7 Nov-7 Jan-8 Mar-8 May-8 Jul-8 Sep-8 Nov-8 Jan-9 Mar-9 May-9 Jul-9 Sep-9 Nov-9 Jan-1 Mar-1 GROUNDWTER MONITORING T MPU Date BH1 BH5 PTTLE DELMORE PRTNERS LTD Depth to Water m

18 Mapua BH m WWD m Old BH m 1.8 m BH m BH m BH m BH m BH m BH D 1. m BH m BH 4a 1.76 m BH m BH 11BH m 2.3 m 13 Tahi 1.41 m 17a Tahi BH 9a 2.1 m BH m m m 1. m.89 m BH G 1.89 m 1.2 m 1.4 m BH 5a 1.56 m BH 1a 1.2 m BH 2a 1.6 m m BH 3a 1.61 m BH H 2.6 m 1.6 BH m BH m.8 m 2.2 m 1.6 m BH L 2.1 m Metres Figure 11 : Groundwater levels and contours on 9/2/1 E:\rcview GIS\Jobs\CJ4-CJ449\CJ4163\Projects\Feb1\CJ4163_Fig12_GW_Levels.mxd PTTLE DELMORE PRTNERS LTD

19 Mapua BH mg/l Old BH mg/l BH mg/l BH mg/l BH mg/l BH mg/l BH 111B.23 mg/l BH 111 <.2 mg/l BH mg/l BH 14BH 14B 76 mg/l 77 mg/l BH 3 8 mg/l BH 5 24 mg/l BH mg/l BH 11 BH mg/l24 mg/l BH mg/l BH H 7.3 mg/l BH mg/l BH 1.4 mg/l BH 2 48 mg/l BH D 3.1 mg/l East Estuary Seepage.11 mg/l 13 Tahi St 1.7 mg/l BH G.22 mg/l BH 9 14 mg/l BH mg/l Legend Nitrate nitrogen concentration mg/l < > Metres Figure 12 : Nitrate nitrogen concentrations in February 21 E:\rcview GIS\Jobs\CJ4-CJ449\CJ4163\Projects\Feb1\CJ4163_Fig13_Nitrate.mxd PTTLE DELMORE PRTNERS LTD

20 Mapua BH mg/l Old BH 1 <.1 mg/l BH mg/l BH mg/l BH mg/l BH mg/l BH 111 BH 111B 67 mg/l69 mg/l BH D.12 mg/l BH mg/l BH 4 <.1 mg/l BH 3 <.1 mg/l BH 5.22 mg/l BH 11 BH mg/l61 mg/l BH mg/l BH 14BH 14B 29 mg/l 28 mg/l BH 17.1 mg/l BH H 8.3 mg/l BH 1 97 mg/l BH 2 52 mg/l East Estuary Seepage 1.8 mg/l 13 Tahi St.38 mg/l BH G.65 mg/l BH mg/l BH mg/l Legend mmonia nitrogen concentration mg/l < > Metres Figure 13 : mmonia nitrogen concentrations in February 21 E:\rcview GIS\Jobs\CJ4-CJ449\CJ4163\Projects\Feb1\CJ4163_Fig14_mmonia.mxd PTTLE DELMORE PRTNERS LTD

21 Mapua BH mg/l Old BH mg/l BH mg/l BH mg/l BH mg/l BH mg/l BH 111 BH 111B 7 mg/l66 mg/l BH mg/l BH mg/l BH 5 24 mg/l BH mg/l BH 11 BH mg/l9 mg/l BH G 1.4 mg/l BH 9 16 mg/l BH mg/l BH 14 BH 14B 15 mg/l15 mg/l BH mg/l BH H 15.2 mg/l BH D 3.6 mg/l BH 1 11 mg/l East Estuary Seepage 3.2 mg/l BH 2 98 mg/l BH mg/l 13 Tahi St 2.3 mg/l Legend Total nitrogen concentration mg/l <1 1-2 > Metres Figure 14 : Total nitrogen concentrations in February 21 E:\rcview GIS\Jobs\CJ4-CJ449\CJ4163\Projects\Feb1\CJ4163_Fig15_TotalN.mxd PTTLE DELMORE PRTNERS LTD

22 Mapua BH mg/l Old BH 1.54 mg/l BH 18 3 mg/l BH 15.5 mg/l BH 16 <.4 mg/l BH 19 <.4 mg/l BH 111B <.4 mg/l BH 111 <.4 mg/l BH D.41 mg/l BH 11 2 mg/l BH 14 BH 14B.16 mg/l.14 mg/l BH 3.6 mg/l BH mg/l BH 4.89 mg/l BH mg/l BH mg/l BH G <.4 mg/l BH 9.31 mg/l BH mg/l BH H.62 mg/l BH mg/l BH 13.1 mg/l BH 112 <.4 mg/l BH 1 <.4 mg/l East Estuary Seepage.88 mg/l 13 Tahi St.42 mg/l Legend DRP concentration mg/l < > Metres Figure 15 : Dissolved reactive phosphorus concentrations in February 21 E:\rcview GIS\Jobs\CJ4-CJ449\CJ4163\Projects\Feb1\CJ4163_Fig16_DRP.mxd PTTLE DELMORE PRTNERS LTD

23 Mapua BH mg/l Old BH 1.46 mg/l BH mg/l BH mg/l BH mg/l BH 14 BH 14B.1459 mg/l.1277 mg/l BH 3 BH 5.8 mg/l.1447 mg/l BH mg/l BH mg/l BH mg/l BH G.3 mg/l BH 111B.16 mg/l BH mg/l BH mg/l BH mg/l BH H.2855 mg/l BH mg/l BH mg/l BH 1.15 mg/l East Estuary Seepage BH 2.37 mg/l.44 mg/l BH D.77 mg/l 13 Tahi St.3 mg/l BH 9.36 mg/l BH mg/l Legend DDX concentration mg/l < >.1 Note: DDX was calculated by summing the laboratory results of the individual DD_ compounds. Where one of the DD_ compounds was below the detection limit, a value of half the detection limit was used in the sum. Where all compounds in the sum are non-detects, the overall detection limit is the sum of the detection limits Metres Figure 16 : DDX concentrations in February 21 E:\rcview GIS\Jobs\CJ4-CJ449\CJ4163\Projects\Feb1\CJ4163_Fig17_DDX.mxd PTTLE DELMORE PRTNERS LTD

24 Mapua BH mg/l Old BH mg/l BH mg/l BH mg/l BH mg/l BH mg/l BH 14 BH 14B.361 mg/l.349 mg/l BH 5 BH mg/l.1251 mg/l BH mg/l BH mg/l BH mg/l BH G BH mg/l.362 mg/l BH mg/l BH H.173 mg/l BH 111B.6865 mg/l BH mg/l BH D mg/l BH mg/l BH mg/l BH mg/l BH mg/l BH mg/l East Estuary Seepage.1475 mg/l 13 Tahi St.765 mg/l Legend DL concentration mg/l < >.1 Note: DL was calculated by summing ldrin, Dieldrin and 1% Lindane. Where either ldrin or Dieldrin was below the detection limit, a value of half the detection limit was used in the sum Metres Figure 17 : DL concentrations in February 21 E:\rcview GIS\Jobs\CJ4-CJ449\CJ4163\Projects\Feb1\CJ4163_Fig19_DL.mxd PTTLE DELMORE PRTNERS LTD

25 BH18 BH5 BHH BH3 BH4 BH9 BHG BH13 BH19 BH111 Rinsate Blank BH17 13 Tahi St

26 Mapua BH ms/m Old BH ms/m BH ms/m BH ms/m BH ms/m BH ms/m BH 111B 797 ms/m BH ms/m BH ms/m BH 14 BH 14B 186 ms/m185 ms/m BH ms/m BH ms/m BH ms/m BH 11 BH ms/m668 ms/m BH ms/m BH H 95.8 ms/m BH D 18 ms/m BH ms/m BH 1 East Estuary Seepage 274 ms/m 52 ms/m BH ms/m 13 Tahi St 18 ms/m BH G 253 ms/m BH ms/m BH ms/m Legend Conductivity ms/m <3 3-1 > Metres Figure 19 : Conductivity values in February 21 E:\rcview GIS\Jobs\CJ4-CJ449\CJ4163\Projects\Feb1\CJ4163_Fig21_Cond.mxd PTTLE DELMORE PRTNERS LTD

27 Mapua BH mg/l Old BH 1.15 mg/l BH mg/l BH mg/l BH 16 <.5 mg/l BH 19 <.1 mg/l BH 14 BH 14B.32 mg/l.37 mg/l BH 3.17 mg/l BH 4.27 mg/l BH 5.11 mg/l BH mg/l BH mg/l BH G <.25 mg/l BH 9.38 mg/l BH mg/l BH H.35 mg/l BH 111B <.1 mg/l BH 111 <.1 mg/l BH 11 <.1 mg/l BH D.21 mg/l BH 112 <.25 mg/l BH 1 <.1 mg/l East Estuary Seepage.25 mg/l BH 2.11 mg/l BH mg/l 13 Tahi St.57 mg/l Legend Dissolved copper concentration mg/l < > Metres Figure 2 : Dissolved copper concentrations in February 21 E:\rcview GIS\Jobs\CJ4-CJ449\CJ4163\Projects\Feb1\CJ4163_Fig22_Copper.mxd PTTLE DELMORE PRTNERS LTD

28 Mapua BH 113 <.2 mg/l Old BH 1 <.2 mg/l BH 18 <.2 mg/l BH 15 <.2 mg/l BH 16 <.2 mg/l BH 19 <.2 mg/l BH 17 <.2 mg/l BH mg/l BH 12 <.4 mg/l BH 3 <.2 mg/l BH 5 <.4 mg/l BH G 6 mg/l BH H <.2 mg/l BH D <.2 mg/l BH 14 BH 14B <.2 mg/l<.2 mg/l BH 4 <.2 mg/l BH 111 BH 111B 7.9 mg/l 12 mg/l BH 11.1 mg/l BH mg/l BH 1 East Estuary Seepage.24 mg/l.58 mg/l BH 2 <.4 mg/l 13 Tahi St.32 mg/l BH 9 <.2 mg/l BH 13 <.2 mg/l Legend Dissolved iron concentration mg/l < > Metres Figure 21 : Dissolved iron concentrations in February 21 E:\rcview GIS\Jobs\CJ4-CJ449\CJ4163\Projects\Feb1\CJ4163_Fig23_Iron.mxd PTTLE DELMORE PRTNERS LTD