NELSON CITY COUNCIL. Bell Island Treatment Ponds Sludge Survey Report. November Commercial in Confidence.

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1 NELSON CITY COUNCIL Bell Island Treatment Ponds Sludge Survey Report November 5 Commercial in Confidence CONHUR LTD PO BOX 4 Highbrook Mail Centre East Tamaki 34 Oakleigh Avenue Takanini, Auckland Ph Fax

2 Table of Contents. INTRODUCTION 3. METHODOLOGY 3 3 SITE PHOTOGRAPHS 5 4 RESULTS 7 5 COMPOSITE SLUDGE SAMPLE ANALYSIS 3 6 CONCLUSION 7 7 BELL ISLAND TREATMENT PONDS SLUDGE SURVEY DRAWINGS 9 8 APPENDIX 37 Commercial in Confidence Page of 4 3 November 5

3 . INTRODUCTION Conhur provides sludge surveys for both sludge lagoons and oxidation ponds. We utilize the latest technology to provide as accurate a result as possible. Our sludge surveys provide estimates of: The volume of sludge contained within the ponds The average solids content of the sludge contained in the ponds The total tonnes dry solids (tds) contained within the ponds Conhur was contracted by Nelmac, on behalf of Nelson City Council, to survey the sludge contained in the three facultative ponds and two maturation ponds at the Bell Island WWTP. The survey was undertaken over a period of two days from to 3 November 5 in fine, calm, warm weather conditions. This was a follow up to previous surveys completed on the same ponds by Conhur in June 4 and November.. METHODOLOGY Pond Base survey The bases of the Ponds were surveyed utilizing high accuracy GPS equipment and integrated topographic software. This survey was carried out from a survey boat on the ponds. The ponds were surveyed on grid system with survey points at 5m centres. For this sludge survey, the GPS coordinate system used was NZGD, NZ Transverse Mercator. The reduced levels provided are relative only and have not been calibrated against known survey reference heights. For the 5 survey it was found that the pond water surface levels were generally up to mm higher than in 5. This accounts for the difference in average depths and total pond volumes in 5. Sludge water interface The level of the sludge water interface was measured utilizing a Royce 7 suspended solids interface meter. This tool provides an accurate indication of the level of the top of the sludge. Conhur recorded this information with high accuracy GPS equipment and integrated topographic software. This survey was carried out from a survey boat on the ponds and provides a reasonably accurate profile of the top of the sludge layer. Commercial in Confidence Page 3 of 4 3 November 5

4 Sludge Volume The sludge volume within the ponds was calculated by comparing the base surveys and the surveys of the top level of the sludge. This calculation is carried out by the topographic survey software and enables the production of both cross sections through the ponds and plan profiles of the sludge within the ponds. Sludge Samples Conhur utilized a purpose built grab sample tube to recover sludge samples from within each of the ponds. The sample tube has proven to provide the best method of sludge sample retrieval. Ten samples were retrieved at specific sludge survey locations on each pond. The retrieval of intact, undisturbed insitu sludge samples from treatment ponds is a difficult process and does not provide % accurate results. This is especially true when the sludge layer is less than 5mm deep. Conhur Ltd has made every attempt and used best industry practice to retrieve representative samples, however we cannot guarantee accuracy of the solids analysis results. Sludge Sample Analysis The fifty individual sludge samples retrieved were sent to the Watercare Services Ltd Laboratory in Auckland for total solids testing. The results are provided in Section 4 of this report and appended. In addition, two composite sludge samples were prepared for each Facultative Pond and composite sludge sample was prepared from each Maturation Pond. The composite samples were also sent to the Watercare Services Ltd Laboratory and tested for volatile solids, heavy metals and nutrient concentration. The results are provided in Section 5 of this report and appended. Commercial in Confidence Page 4 of 4 3 November 5

5 3 SITE PHOTOGRAPHS Bell Island WWTP Aerial View Commercial in Confidence Page 5 of 4 3 November 5

6 Facultative Ponds F on the day of the survey Maturation Pond M5 (left), Facultative Pond F (right) Commercial in Confidence Page 6 of 4 3 November 5

7 4. SLUDGE SURVEY RESULTS Maturation Pond M The RL of the pond water surface when surveyed was 3.3m in Pond M. This level relates to the top of concrete of the outlet structure at the NE end of Pond M, which was measured as RL 3.54m. The average depth to the pond base from the water surface is.4m. The total volume of the pond is estimated to be 4,34m 3. The average depth to the sludge surface from the water surface is.m. The average depth of sludge in the pond is.9m. The maximum depth of sludge in the pond is.66m. The total volume of sludge in the pond is estimated to be,94m 3. The weighted average solids contents of the samples retrieved was.9% Based on the above we estimate that Pond M contains approximately 98 dry tonnes (tds) of sludge. The solids contents of the samples retrieved from Maturation Pond M were as follows: Sample M.8% Sample M.% Sample M3.6% Sample M4.% Sample M5.4% Sample M6.% Sample M7.3% Sample M8.8% Sample M9.6% Sample M.% Commercial in Confidence Page 7 of 4 3 November 5

8 Maturation Pond M5 The RL of the pond water surface when surveyed was.84m in Pond M5. This level relates to the top of concrete of the access platform at the south end of Pond M5, which was measured as RL 3.m. The average depth to the pond base from the water surface is.m. The total volume of the pond is estimated to be,78m 3. The average depth to the sludge surface from the water surface is.9m. The average depth of sludge in the pond is.9m. The maximum depth of sludge in the pond is.5m. The total volume of sludge in the pond is estimated to be 5,95m 3. The weighted average solids contents of the samples retrieved was.4% Based on the above we estimate that Pond M5 contains approximately 7 dry tonnes (tds) of sludge. The solids contents of the samples retrieved from Maturation Pond M5 were as follows: Sample M5.3% Sample M5.5% Sample M53.% Sample M54.3% Sample M55.% Sample M56.% Sample M57.4% Sample M58.% Sample M59.% Sample M5.% Commercial in Confidence Page 8 of 4 3 November 5

9 Facultative Pond F The RL of the pond water surface when surveyed was 3.66m in Pond F. This level relates to the top of concrete of the access platform at the north end of Pond F, which was measured as RL 3.8m. The average depth to the pond base from the water surface is.76m. The total volume of the pond is estimated to be 76,5m 3. The average depth to the sludge surface from the water surface is.6m. The average depth of sludge in the pond is.6m. The maximum depth of sludge in the pond is.6m. The total volume of sludge in the pond is estimated to be 5,93m 3. The weighted average solids contents of the samples retrieved was 3.% Based on the above we estimate that Pond F contains approximately,596 dry tonnes (tds) of sludge. The solids contents of the samples retrieved from Facultative Pond F were as follows: Sample F.8% Sample F 3.% Sample F3 4.9% Sample F4 4.7% Sample F5.% Sample F6.6% Sample F7.3% Sample F8.3% Sample F9 3.% Sample F 3.% Commercial in Confidence Page 9 of 4 3 November 5

10 Facultative Pond F The RL of the pond water surface when surveyed was 3.67m in Pond F. This level relates to the top of concrete of the access platform at the north end of Pond F, which was measured as RL 3.86m. The average depth to the pond base from the water surface is.88m. The total volume of the pond is estimated to be 87,64m 3. The average depth to the sludge surface from the water surface is.m. The average depth of sludge in the pond is.77m. The maximum depth of sludge in the pond is.5m. The total volume of sludge in the pond is estimated to be 7,m 3. The weighted average solids contents of the samples retrieved was 4.% Based on the above we estimate that Pond F contains approximately,878 dry tonnes (tds) of sludge. The solids contents of the samples retrieved from Facultative Pond F were as follows: Sample F 3.3% Sample F.7% Sample F3 3.7% Sample F4 3.9% Sample F5 5.% Sample F6 4.5% Sample F7.% Sample F8 4.4% Sample F9 3.7% Sample F 3.9% Commercial in Confidence Page of 4 3 November 5

11 Facultative Pond F3 The RL of the pond water surface when surveyed was 3.55m in Pond F3. This level relates to the top of concrete of the access platform at the north end of Pond F3, which was measured as RL 3.9m. The average depth to the pond base from the water surface is.63m. The total volume of the pond is estimated to be 63,77m 3. The average depth to the sludge surface from the water surface is.6m. The average depth of sludge in the pond is.57m. The maximum depth of sludge in the pond is.3m. The total volume of sludge in the pond is estimated to be 5,7m 3. The weighted average solids contents of the samples retrieved was 3.% Based on the above we estimate that Pond F3 contains approximately,7 dry tonnes (tds) of sludge. The solids contents of the samples retrieved from Facultative Pond F3 were as follows: Sample F3.8% Sample F3 3.3% Sample F33 4.4% Sample F34 3.7% Sample F35 3.4% Sample F36 3.3% Sample F37 3.% Sample F38.8% Sample F39.6% Sample F3.8% Commercial in Confidence Page of 4 3 November 5

12 Sludge Survey Summary Table Avg. Est. Weighted Est. Avg. Depth Avg. Max. Total Est. Average Tonnes Water Pond to Sludge Sludge Pond Sludge Sludge Dry Level Depth Sludge Depth Depth Volume Volume Solids Solids Pond (m) (m) (m) (m) (m) (m 3 ) (m 3 ) Content (tds) ,34,94.9% 98 M ,67 8,43.7% ,78 5,95.4% 7 M ,57 9,9.4% ,5 5,93 3.%,596 F ,3 5,34.9%, ,64 7, 4.,878 F ,8 66,4 4.8% 3, ,77 5,7 3.%,7 F ,76 5,9 3.5%,85 Note: Numbers above in bold are 5 survey results. Numbers above in italics are 4 survey results for comparison. Commercial in Confidence Page of 4 3 November 5

13 5. COMPOSITE SLUDGE SAMPLE ANALYSIS Two composite samples from each Facultative Pond and one composite sample from each Maturation Pond were prepared from the individual samples retrieved. The composite samples were sent to Watercare Services Laboratory for composition, nutrient and volatile solids analysis. The Maturation Pond composite samples were prepared from all of the individual samples from each pond. The Facultative Pond composite samples were prepared from half of the individual samples from each pond. The makeup of the composite samples is as follows: Pond ID Individual Samples making up the Composite Sample M M Comp M to M M5 M5 to M5 F F Comp F, F, F3, F4, F5 F Comp F6, F7, F8, F9, F F F Comp F, F, F3, F4, F5 F Comp F6, F7, F8, F9, F F3 F3, F3, F33, F34, F35 F36, F37, F38, F39, F3 The composite sample testing undertaken was as follows: Heavy Metal Screening: Arsenic, Cadmium, Chromium, Copper, Lead, Nickel, Zinc Nutrient Testing: Calcium, Nitrogen, Phosphorous, Ammonium Nitrogen Volatile Solids (including Total Suspended Solids) Graphical representation of each test follows with a comparison of the 4 analysis, and the Watercare results report is appended. Commercial in Confidence Page 3 of 4 3 November 5

14 5 Arsenic (Total) M Comp F Comp F Comp F Comp F Comp. 4 Arsenic (Total) M Comp.87.. F Comp F Comp F Comp F Comp Commercial in Confidence Page 4 of 4 3 November 5

15 5 Cadmium (Total) M Comp F Comp F Comp F Comp F Comp 4 Cadmium (Total) M Comp F Comp F Comp F Comp F Comp Commercial in Confidence Page 5 of 4 3 November 5

16 5 Calcium (Total) M Comp 57 3 F Comp 8 F Comp F Comp F Comp 3 4 Calcium (Total) M Comp 5 F Comp F Comp F Comp F Comp 6 35 Commercial in Confidence Page 6 of 4 3 November 5

17 5 Chromium (Total) M Comp F Comp F Comp F Comp F Comp 4 Chromium (Total) M Comp F Comp F Comp F Comp F Comp Commercial in Confidence Page 7 of 4 3 November 5

18 5 Copper (Total) M Comp.78 F Comp F Comp F Comp F Comp 4 Copper (Total) M Comp F Comp F Comp F Comp F Comp Commercial in Confidence Page 8 of 4 3 November 5

19 5 (Total) M Comp F Comp F Comp F Comp F Comp 4 Lead (Total) M Comp F Comp F Comp F Comp F Comp Commercial in Confidence Page 9 of 4 3 November 5

20 5 Nickel (Total) M Comp.9.5 F Comp F Comp.6 F Comp.8.8 F Comp. 4 Nickel (Total) M Comp F Comp F Comp F Comp F Comp Commercial in Confidence Page of 4 3 November 5

21 5 Phosphorous (Total) M Comp F Comp F Comp F Comp F Comp 4 Phosphorous (Total) M Comp F Comp F Comp F Comp F Comp Commercial in Confidence Page of 4 3 November 5

22 5 Zinc (Total) M Comp F Comp F Comp F Comp F Comp 4 Zinc (Total) M Comp F Comp F Comp F Comp F Comp Commercial in Confidence Page of 4 3 November 5

23 5 Ammonium Nitrogen (as N) M Comp F Comp F Comp F Comp F Comp 4 Ammonium Nitrogen (as N) M Comp F Comp F Comp F Comp F Comp Commercial in Confidence Page 3 of 4 3 November 5

24 5 Total Nitrogen (as N) M Comp F Comp F Comp F Comp F Comp 4 Total Nitrogen (as N) M Comp F Comp F Comp F Comp F Comp Commercial in Confidence Page 4 of 4 3 November 5

25 5 Total SuspendedSolids 4.% 3.5% 3.%.5%.%.5%.%.5%.%.55% M Comp.34%.8%.6% 3.8% 3.7% 3.6% 3.% F Comp F Comp F Comp F Comp 4 Total SuspendedSolids 4.% 3.5% 3.%.5%.%.5%.%.5%.%.6% M Comp.% 3.8% 3.4%.4%.5%.7%.% F Comp F Comp F Comp F Comp Commercial in Confidence Page 5 of 4 3 November 5

26 5 Volatile Solids 8.% 8.% 78.% 76.% 74.% 7.% 7.% 68.% 66.% 64.% 6.% 6.% 8.% M Comp 7.6% 69.% 67.9% 68.4% 69.4% 7.% 67.6% F Comp F Comp F Comp F Comp 4 Volatile Solids 78.% 76.% 74.% 7.% 7.% 68.% 66.% 64.% 6.% 6.% 58.% 77.% M Comp 64.5% 7.4% 7.% 7.4% 66.7% 67.6% 65.8% F Comp F Comp F Comp F Comp Commercial in Confidence Page 6 of 4 3 November 5

27 6 CONCLUSION Maturation Pond M: The survey confirms the volume of sludge in Pond M is approximately,94m 3, spread reasonably evenly around the pond with an average sludge depth of 9mm, to a maximum 66mm sludge depth. Due to the sludge layer being very thin it was difficult to retrieve representative sludge samples. This is reflected in the average solids content being so low. The sludge samples retrieved from the pond indicate that the average solids content is.9%. This is very low for sewage sludge but is probably to be expected from a Maturation Pond, being the last treatment process. Based on the above, we estimate that Maturation Pond M contains approximately 98 dry tonnes (tds) of sludge, which equates to Pond M being approximately 5% full of sludge. This is very little increase from the 4 survey. Maturation Pond M5: The survey confirms the volume of sludge in Pond M5 is approximately 5,95m 3, spread reasonably evenly around the pond with an average sludge depth of 9mm, to a maximum 5mm sludge depth. The sludge samples retrieved from the pond indicate that the average solids content is.4%. This is very low for sewage sludge but is probably to be expected from a Maturation Pond, being the last treatment process. Based on the above, we estimate that Maturation Pond M5 contains approximately 7 dry tonnes (tds) of sludge, which equates to Pond M5 being approximately 4% full of sludge. There appears to be significantly more sludge in M5 than in 4, however the solids results were lower resulting in fewer tonnes dry solids. Facultative Pond F: The survey confirms the volume of sludge in Pond F is approximately 5,93m 3. The heaviest build ups of sludge are at the SE and SW corners of the pond. The average sludge depth over the whole pond is 6mm. The maximum sludge depth is,6mm. Commercial in Confidence Page 7 of 4 3 November 5

28 The sludge samples retrieved from the pond indicate that the average solids content is 3.%. Based on Conhurs experience with previous pond surveys, this is at the low end of the normal expected range for sewage sludge which Conhur has found typically falls within 3%6% depending on sludge depth. Based on the above, we estimate that Facultative Pond F contains approximately,596 dry tonnes (tds) of sludge, which equates to Pond F being approximately 9% full of sludge. The sludge quantity is almost identical to the 4 survey result. Facultative Pond F: The survey confirms the volume of sludge in Pond F is approximately 7,m 3. The heaviest build ups of sludge are at the northern end of the pond. The average sludge depth over the whole pond is 77mm. The maximum sludge depth is,5mm. The sludge samples retrieved from the pond indicate that the average solids content is 4.%. Based on Conhurs experience with previous pond surveys, this is within the normal expected range for sewage sludge which Conhur has found typically falls within 3%6% depending on sludge depth. Based on the above, we estimate that Facultative Pond F contains approximately,878 dry tonnes (tds) of sludge, which equates to Pond F being approximately 38% full of sludge. The sludge quantity is almost identical to the 4 survey result. Facultative Pond F3: The survey confirms the volume of sludge in Pond F3 is approximately 5,7m 3. The heaviest build ups of sludge are around the perimeter of the pond. The average sludge depth over the whole pond is 57mm. The maximum sludge depth is,3mm. The sludge samples retrieved from the pond indicate that the average solids content is 3.%. Based on Conhurs experience with previous pond surveys, this is within the normal expected range for sewage sludge which Conhur has found typically falls within 3%6% depending on sludge depth. Based on the above, we estimate that Facultative Pond F3 contains approximately,7 dry tonnes (tds) of sludge, which equates to Pond F being approximately 3% full of sludge. The sludge quantity is almost identical to the 4 survey result. Commercial in Confidence Page 8 of 4 3 November 5

29 7. BELL ISLAND TREATMENT PONDS SLUDGE SURVEY DRAWINGS Topographical Plan Sludge Depth Plan Profile Layout Cross Sections (Sheets 5) Commercial in Confidence Page 9 of 4 3 November 5

30 File Name: J:\433\Dwg\4333.dwg Plot Date: 4//5 Plot Time: 5:4 CONHUR 34 Oakleigh Avenue Takanini PO Box 4 Highbrook Mail Centre East Tamaki AUCKLAND 6 REF: GENERAL NOTES. Coordinates in terms of : NZ Transverse Mercator (Approx.). Elevations in terms of : Mean Sea Level (Approx.) 3. Contour interval is :.m SCALE : 4 m NO DATE BY CHKD. APPR. OPER. REVISIONS DESCRIPTION LOCATION PROJECT No. SCALE :4 NELSON 433 DRAWN CHECKED DES. ENG. PROJ. ENG. APPROVED OPERATIONS C G Smith 3//5 G Johnston 4//5 ORIGINAL SIZE A3 TITLE TOPOGRAPHICAL PLAN 3 November 5 DRAWING No SHEET NO. REVISION 4333

31 POND VOLUMES as at 3th November 5 F POND VOLUME 76,5 m³ F SLUDGE VOLUME 5,93 m³ F POND VOLUME 87,64 m³ F SLUDGE VOLUME 7, m³ F3 POND VOLUME 63,77 m³ F3 SLUDGE VOLUME 5,7 m³ M POND VOLUME 4,34 m³ M SLUDGE VOLUME,94 m³ M5 POND VOLUME,78 m³ M5 SLUDGE VOLUME 5,95 m³ M M5 F3 F F File Name: J:\433\Dwg\4333.dwg Plot Date: 4//5 Plot Time: 5:4 CONHUR 34 Oakleigh Avenue Takanini PO Box 4 Highbrook Mail Centre East Tamaki AUCKLAND 6 REF: GENERAL NOTES. Coordinates in terms of : NZ Transverse Mercator (Approx.). Elevations in terms of : Mean Sea Level (Approx.) 3. Contour interval is :.m SCALE : 4 m NO DATE BY CHKD. APPR. OPER. REVISIONS DESCRIPTION LOCATION PROJECT No. SCALE :4 NELSON 433 DRAWN CHECKED DES. ENG. PROJ. ENG. APPROVED OPERATIONS C G Smith 3//5 G Johnston 4//5 ORIGINAL SIZE A3 TITLE SLUDGE DEPTH 3 November 5 DRAWING No SHEET NO. REVISION 4333

32 Profile Profile M M5 Profile 3 F3 Profile 4 F Profile 6 F Profile 7 Profile 5 File Name: J:\433\Dwg\4333.dwg Plot Date: 4//5 Plot Time: 5:4 CONHUR 34 Oakleigh Avenue Takanini PO Box 4 Highbrook Mail Centre East Tamaki AUCKLAND 6 REF: GENERAL NOTES. Coordinates in terms of : NZ Transverse Mercator (Approx.). Elevations in terms of : Mean Sea Level (Approx.) 3. Contour interval is : N/A SCALE : 4 m Profile NO DATE BY CHKD. APPR. OPER. REVISIONS Profile 9 DESCRIPTION Profile Profile LOCATION PROJECT No. SCALE :4 NELSON 433 DRAWN CHECKED DES. ENG. PROJ. ENG. APPROVED OPERATIONS C G Smith 3//5 G Johnston 4//5 ORIGINAL SIZE A3 TITLE PROFILE LAYOUT 3 November 5 DRAWING No SHEET NO. REVISION

33 File Name: J:\433\Dwg\4333.dwg Plot Date: 4//5 Plot Time: 5: m m HZ SCALE : 5 VERT SCALE : 5 CONHUR 34 Oakleigh Avenue Takanini PO Box 4 Highbrook Mail Centre East Tamaki AUCKLAND 6 REF: 4333 GENERAL NOTES. Coordinates in terms of : NZ Transverse Mercator (Approx.). Elevations in terms of : Mean Sea Level (Approx.) 3. Contour interval is : N/A NO DATE BY CHKD. APPR. OPER. REVISIONS DESCRIPTION LOCATION PROJECT No. NELSON 433 SCALE Hz :5 Vert :5 DRAWN CHECKED DES. ENG. PROJ. ENG. APPROVED OPERATIONS C G Smith 3//5 G Johnston 4//5 ORIGINAL SIZE A3 TITLE CROSS SECTIONS Sheet 3 November 5 DRAWING No SHEET NO. REVISION

34 File Name: J:\433\Dwg\4333.dwg Plot Date: 4//5 Plot Time: 5: m m HZ SCALE : 3 VERT SCALE : 3 CONHUR 34 Oakleigh Avenue Takanini PO Box 4 Highbrook Mail Centre East Tamaki AUCKLAND 6 REF: 4333 GENERAL NOTES. Coordinates in terms of : NZ Transverse Mercator (Approx.). Elevations in terms of : Mean Sea Level (Approx.) 3. Contour interval is : N/A NO DATE BY CHKD. APPR. OPER. REVISIONS DESCRIPTION LOCATION PROJECT No. NELSON 433 SCALE Hz :3 Vert :3 DRAWN CHECKED DES. ENG. PROJ. ENG. APPROVED OPERATIONS C G Smith 3//5 G Johnston 4//5 ORIGINAL SIZE A3 TITLE CROSS SECTIONS Sheet 3 November 5 DRAWING No SHEET NO. REVISION

35 4 6 8 m m HZ SCALE : 5 VERT SCALE : 5 File Name: J:\433\Dwg\4333.dwg Plot Date: 4//5 Plot Time: 5:4 CONHUR 34 Oakleigh Avenue Takanini PO Box 4 Highbrook Mail Centre East Tamaki AUCKLAND 6 REF: 4333 GENERAL NOTES. Coordinates in terms of : NZ Transverse Mercator (Approx.). Elevations in terms of : Mean Sea Level (Approx.) 3. Contour interval is : N/A NO DATE BY CHKD. APPR. OPER. REVISIONS DESCRIPTION LOCATION PROJECT No. NELSON 433 SCALE Hz :5 Vert :5 DRAWN CHECKED DES. ENG. PROJ. ENG. APPROVED OPERATIONS C G Smith 3//5 G Johnston 4//5 ORIGINAL SIZE A3 TITLE CROSS SECTIONS Sheet 3 3 November 5 DRAWING No SHEET NO. REVISION

36 File Name: J:\433\Dwg\4333.dwg Plot Date: 4//5 Plot Time: 5: m m HZ SCALE : 5 CONHUR 34 Oakleigh Avenue Takanini PO Box 4 Highbrook Mail Centre East Tamaki AUCKLAND 6 REF: 4333 VERT SCALE : 5 GENERAL NOTES. Coordinates in terms of : NZ Transverse Mercator (Approx.). Elevations in terms of : Mean Sea Level (Approx.) 3. Contour interval is : N/A NO DATE BY CHKD. APPR. OPER. REVISIONS DESCRIPTION LOCATION PROJECT No. NELSON 433 SCALE Hz :5 Vert :5 DRAWN CHECKED DES. ENG. PROJ. ENG. APPROVED OPERATIONS C G Smith 3//5 G Johnston 4//5 ORIGINAL SIZE A3 TITLE CROSS SECTIONS Sheet 4 3 November 5 DRAWING No SHEET NO. REVISION

37 File Name: J:\433\Dwg\4333.dwg Plot Date: 4//5 Plot Time: 5: m m HZ SCALE : 5 CONHUR 34 Oakleigh Avenue Takanini PO Box 4 Highbrook Mail Centre East Tamaki AUCKLAND 6 REF: 4333 VERT SCALE : 5 GENERAL NOTES. Coordinates in terms of : NZ Transverse Mercator (Approx.). Elevations in terms of : Mean Sea Level (Approx.) 3. Contour interval is : N/A NO DATE BY CHKD. APPR. OPER. REVISIONS DESCRIPTION LOCATION PROJECT No. NELSON 433 SCALE Hz :5 Vert :5 DRAWN CHECKED DES. ENG. PROJ. ENG. APPROVED OPERATIONS C G Smith 3//5 G Johnston 4//5 ORIGINAL SIZE A3 TITLE CROSS SECTIONS Sheet 5 3 November 5 DRAWING No SHEET NO. REVISION

38 Auckland 5 Aintree Ave, PO Box 78, Auckland Airport, Invercargill 4 Esk Street, PO Box 747, Invercargill, 984 Queenstown 74 Glenda Drive, PO Box 64, Wakatipu, Tel: Fax: (9) (9) (3) 4 44 (3) 4 44 Certificate of Analysis Laboratory Reference:56 (3) clientsupport@water.co.nz Attention: Client: Mark McLaughlin CONHUR LTD Final Report: Report Issue Date: Nov5 Address: PO Box 4, HIGHBROOK, 6 Received Date: 6Nov5 Client Reference: Bells Island WWTP Nelson Purchase Order: 5 Quote Reference : 67 Sample Details SOLIDS SOLIDS SOLIDS SOLIDS Lab Sample ID: Client Sample ID: Sample Date/Time: //5 3//5 3//5 3//5 Description: F F F3 F4 General Testing Total Solids % Sample Details SOLIDS SOLIDS SOLIDS SOLIDS Lab Sample ID: Client Sample ID: Sample Date/Time: //5 3//5 3//5 3//5 Description: F5 F6 F7 F8 General Testing Total Solids % Sample Details SOLIDS SOLIDS SOLIDS SOLIDS Lab Sample ID: Client Sample ID: Sample Date/Time: //5 3//5 3//5 3//5 Description: F9 F F F General Testing Total Solids % Sample Details SOLIDS SOLIDS SOLIDS SOLIDS Lab Sample ID: Client Sample ID: Sample Date/Time: //5 3//5 3//5 3//5 Description: F3 F4 F5 F6 General Testing Total Solids % Sample Details SOLIDS SOLIDS SOLIDS SOLIDS Lab Sample ID: Client Sample ID: Sample Date/Time: //5 3//5 3//5 3//5 Description: F7 F8 F9 F General Testing Total Solids % Sample Details SOLIDS SOLIDS SOLIDS SOLIDS Lab Sample ID: Client Sample ID: Sample Date/Time: //5 3//5 3//5 3//5 Description: F3 F3 F33 F34 Report Number: 6779 Watercare Laboratory Services Page of 5

39 General Testing Total Solids % Sample Details SOLIDS SOLIDS SOLIDS SOLIDS Lab Sample ID: Client Sample ID: Sample Date/Time: //5 3//5 3//5 3//5 Description: F35 F36 F37 F38 General Testing Total Solids % Sample Details SOLIDS SOLIDS SOLIDS SOLIDS Lab Sample ID: Client Sample ID: Sample Date/Time: //5 3//5 //5 //5 Description: F39 F3 M M General Testing Total Solids % Sample Details SOLIDS SOLIDS SOLIDS SOLIDS Lab Sample ID: Client Sample ID: Sample Date/Time: //5 //5 //5 //5 Description: M3 M4 M5 M6 General Testing Total Solids % Sample Details SOLIDS SOLIDS SOLIDS SOLIDS Lab Sample ID: Client Sample ID: Sample Date/Time: //5 //5 //5 //5 Description: M7 M8 M9 M General Testing Total Solids % Sample Details SOLIDS SOLIDS SOLIDS SOLIDS Lab Sample ID: Client Sample ID: Sample Date/Time: //5 //5 //5 //5 Description: M5 M5 M53 M54 General Testing Total Solids % Sample Details SOLIDS SOLIDS SOLIDS SOLIDS Lab Sample ID: Client Sample ID: Sample Date/Time: //5 //5 //5 //5 Description: M55 M56 M57 M58 General Testing Total Solids %...4. Sample Details SOLIDS SOLIDS WATERS WATERS Lab Sample ID: Client Sample ID: Sample Date/Time: //5 //5 3//5 3//5 Description: M59 M5 F Comp F Comp General Testing Ammoniacal Nitrogen (as N) mg/l 96 Total Nitrogen (as N) mg/l Total Phosphorus (as P) mg/l Total Solids %.. Total Suspended Solids mg/l 8 6 Report Number: 6779 Watercare Laboratory Services Page of 5

40 Sample Details (continued) SOLIDS SOLIDS WATERS WATERS Lab Sample ID: Client Sample ID: Sample Date/Time: //5 //5 3//5 3//5 Description: M59 M5 F Comp F Comp General Testing Volatile Solids mg/l 9 8 Metals Total Metals by ICPMS Trace (Default Digest) Arsenic (Total) mg/l.3.8 Cadmium (Total) mg/l..8 Calcium (Total) mg/l 3 8 Chromium (Total) mg/l Copper (Total) mg/l 8 6 Lead (Total) mg/l.3.6 Nickel (Total) mg/l.5. Potassium (Total) mg/l 6 58 Zinc (Total) mg/l 3 6 Sample Details WATERS WATERS WATERS WATERS Lab Sample ID: Client Sample ID: Sample Date/Time: //5 3//5 3//5 3//5 Description: F Comp F Comp General Testing Ammoniacal Nitrogen (as N) mg/l Total Nitrogen (as N) mg/l Total Phosphorus (as P) mg/l Total Suspended Solids mg/l Volatile Solids mg/l Metals Total Metals by ICPMS Trace (Default Digest) Arsenic (Total) mg/l Cadmium (Total) mg/l Calcium (Total) mg/l Chromium (Total) mg/l Copper (Total) mg/l Lead (Total) mg/l Nickel (Total) mg/l Potassium (Total) mg/l Zinc (Total) mg/l Sample Details WATERS WATERS Lab Sample ID: Client Sample ID: Sample Date/Time: //5 //5 Description: M Comp General Testing Ammoniacal Nitrogen (as N) mg/l 36 3 Total Nitrogen (as N) mg/l 4 3 Total Phosphorus (as P) mg/l 37 Total Suspended Solids mg/l Volatile Solids mg/l 44 4 Metals Total Metals by ICPMS Trace (Default Digest) Arsenic (Total) mg/l.34. Cadmium (Total) mg/l..38 Calcium (Total) mg/l Chromium (Total) mg/l Copper (Total) mg/l..78 Lead (Total) mg/l.34.4 Nickel (Total) mg/l.37.9 Report Number: 6779 Watercare Laboratory Services Page 3 of 5

41 Sample Details (continued) WATERS WATERS Lab Sample ID: Client Sample ID: Sample Date/Time: //5 //5 Description: M Comp Metals Total Metals by ICPMS Trace (Default Digest) Potassium (Total) mg/l Zinc (Total) mg/l 4..4 Results marked with * are not accredited to International Accreditation New Zealand Where samples have been supplied by the client they are tested as received. A dash indicates no test performed. Reference Methods The sample(s) referred to in this report were analysed by the following method(s) Analyte Method Reference MDL Samples Location General Testing Ammoniacal Nitrogen (as N) by Colorimetry/Discrete Analyser MEWAM, HMSO 98, ISBN mg/l 5, 5, 53, 54, 55, Auckland 56, 57, 58 Total Nitrogen (as N) by Persulphate Digestion and Flow Analysis APHA (online edition) 45P J, 45NO3 F (. mg/l 5, 5, 53, 54, 55, Auckland modified) 56, 57, 58 Total Phosphorus (as P) by Persulphate Digestion and Colorimetry/DiAPHA (online edition) 45P J (modified).4 mg/l 5, 5, 53, 54, 55, Auckland 56, 57, 58 Total Solids by Gravimetry APHA (online edition) 54 G %,, 3, 4, 5, 6, 7, 8, 9,,,, 3, 4, 5, 6, 7, 8, 9,,,, 3, 4, 5, 6, 7, 8, 9, 3, 3, 3, 33, 34, 35, 36, 37, 38, 39, 4, 4, 4, 43, 44, 45, 46, 47, 48, 49, 5 Auckland Total Suspended Solids by Gravimetry In House based on APHA (online edition) mg/l 5, 5, 53, 54, 55, Auckland 54 D, E 56, 57, 58 Volatile Solids by Gravimetry Metals Total Metals by ICPMS Trace (Default Digest) Arsenic (Total) Cadmium (Total) Calcium (Total) Chromium (Total) Copper (Total) Lead (Total) Nickel (Total) Potassium (Total) Zinc (Total) Preparations Digest for Total Metals in Liquids In House based on APHA (online edition) 54 D, E EPA.8, APHA (online edition) 35 or In House method by ICPMS EPA.8, APHA (online edition) 35 or In House method by ICPMS EPA.8, APHA (online edition) 35 or In House method by ICPMS EPA.8, APHA (online edition) 35 or In House method by ICPMS EPA.8, APHA (online edition) 35 or In House method by ICPMS EPA.8, APHA (online edition) 35 or In House method by ICPMS EPA.8, APHA (online edition) 35 or In House method by ICPMS EPA.8, APHA (online edition) 35 or In House method by ICPMS EPA.8, APHA (online edition) 35 or In House method by ICPMS APHA (online edition) 33 E (modified, 4: Nitric:Hydrochloric Acid) mg/l 5, 5, 53, 54, 55, Auckland 56, 57, 58. mg/l 5, 5, 53, 54, 55, Auckland 56, 57, 58.5 mg/l 5, 5, 53, 54, 55, Auckland 56, 57, 58. mg/l 5, 5, 53, 54, 55, Auckland 56, 57, 58. mg/l 5, 5, 53, 54, 55, Auckland 56, 57, 58. mg/l 5, 5, 53, 54, 55, Auckland 56, 57, 58. mg/l 5, 5, 53, 54, 55, Auckland 56, 57, 58. mg/l 5, 5, 53, 54, 55, Auckland 56, 57, 58.5 mg/l 5, 5, 53, 54, 55, Auckland 56, 57, 58. mg/l 5, 5, 53, 54, 55, Auckland 56, 57, 58 5, 5, 53, 54, 55, 56, 57, 58 The method detection limit (MDL) listed is the limit attainable in a relatively clean matrix. If dilutions are required for analysis the detection limit may be higher. Auckland Report Number: 6779 Watercare Laboratory Services Page 4 of 5

42 Samples, with suitable preservation and stability of analytes, will be held by the laboratory for a period of two weeks after results have been reported, unless otherwise advised by the submitter. Watercare Laboratory Services is a division of Watercare Services Limited. This report may not be reproduced, except in full, without the written authority of the Operations Manager. Report Signatory 6//5 John Chang KTP Signatory Report Number: 6779 Watercare Laboratory Services Page 5 of 5