sludge survey report 12-11-15

CONHUR LTDPO BOX 204021

Highbrook Mail CentreEast Tamaki

34 Oakleigh AvenueTakanini, Auckland

Ph 09 278 7109Fax 09 278 7108

www.conhur.com

www.conhur.com

NELSON CITY COUNCIL

Bell Island TreatmentPonds

Sludge Survey Report

November 2015

Commercial in Confidence

BELL ISLAND TREATMENT PONDS SLUDGE SURVEY

Commercial in Confidence of 42 13 November 2015

Table of Contents

1. INTRODUCTION 3

2. METHODOLOGY 3

3 SITE PHOTOGRAPHS 5

4 RESULTS 7

5 COMPOSITE SLUDGE SAMPLE ANALYSIS 13

6 CONCLUSION 27

7 BELL ISLAND TREATMENT PONDS SLUDGE SURVEY DRAWINGS 29

8 APPENDIX 37



1. 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 12 to 13 November 2015 in fine, calm, warm

weather conditions. This was a follow up to previous surveys completed on the same ponds by

Conhur in June 2014 and November 2012.

2. 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 25m centres.

For this sludge survey, the GPS coordinate system used was NZGD2000, NZ Transverse Mercator.

The reduced levels provided are relative only and have not been calibrated against known survey

reference heights.

For the 2015 survey it was found that the pond water surface levels were generally up to 200mm

higher than in 2015. This accounts for the difference in average depths and total pond volumes in

2015.

Sludge water interface

The level of the sludge water interface was measured utilizing a Royce 711 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.



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 100% accurate results. This is especially true when the sludge layer is less than 500mm

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 1

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.



3 SITE PHOTOGRAPHS

Bell Island WWTP Aerial View



Facultative Ponds F1 on the day of the survey

Maturation Pond M5 (left), Facultative Pond F2 (right)



4. SLUDGE SURVEY RESULTS

Maturation Pond M1

The RL of the pond water surface when surveyed was 23.23m in Pond M1. This level relates to the

top of concrete of the outlet structure at the NE end of Pond M1, which was measured as RL

23.54m.

The average depth to the pond base from the water surface is 1.41m.

The total volume of the pond is estimated to be 140,340m3.

The average depth to the sludge surface from the water surface is 1.12m.

The average depth of sludge in the pond is 0.29m.

The maximum depth of sludge in the pond is 0.660m.

The total volume of sludge in the pond is estimated to be 20,940m3.

The weighted average solids contents of the 10 samples retrieved was 0.9%

Based on the above we estimate that Pond M1 contains approximately 198 dry tonnes (tDS) of

sludge.

The solids contents of the 10 samples retrieved from Maturation Pond M1 were as follows:

Sample M1-1 1.8%

Sample M1-2 1.0%

Sample M1-3 1.6%

Sample M1-4 0.2%

Sample M1-5 0.4%

Sample M1-6 0.1%

Sample M1-7 0.3%

Sample M1-8 0.8%

Sample M1-9 0.6%

Sample M1-10 1.0%



Maturation Pond M5

The RL of the pond water surface when surveyed was 22.84m 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

23.00m.








Based on the above we estimate that Pond M5 contains approximately 71 dry tonnes (tDS) of

sludge.

The solids contents of the 10 samples retrieved from Maturation Pond M5 were as follows:

Sample M5-1 0.3%

Sample M5-2 1.5%

Sample M5-3 1.0%

Sample M5-4 0.3%

Sample M5-5 0.1%

Sample M5-6 0.1%

Sample M5-7 0.4%

Sample M5-8 0.2%

Sample M5-9 0.1%

Sample M5-10 0.1%



Facultative Pond F1

The RL of the pond water surface when surveyed was 23.66m in Pond F1. This level relates to the

top of concrete of the access platform at the north end of Pond F1, which was measured as RL

23.82m.








Based on the above we estimate that Pond F1 contains approximately 1,596 dry tonnes (tDS) of

sludge.

The solids contents of the 10 samples retrieved from Facultative Pond F1 were as follows:

Sample F1-1 0.8%

Sample F1-2 3.2%

Sample F1-3 4.9%

Sample F1-4 4.7%

Sample F1-5 0.2%

Sample F1-6 2.6%

Sample F1-7 2.3%

Sample F1-8 2.3%

Sample F1-9 3.0%

Sample F1-10 3.0%



Facultative Pond F2



23.86m.









sludge.


Sample F2-1 3.3%

Sample F2-2 2.7%

Sample F2-3 3.7%

Sample F2-4 3.9%

Sample F2-5 5.0%

Sample F2-6 4.5%

Sample F2-7 2.0%

Sample F2-8 4.4%

Sample F2-9 3.7%

Sample F2-10 3.9%



Facultative Pond F3



23.90m.









sludge.


Sample F3-1 2.8%

Sample F3-2 3.3%

Sample F3-3 4.4%

Sample F3-4 3.7%

Sample F3-5 3.4%

Sample F3-6 3.3%

Sample F3-7 3.2%

Sample F3-8 2.8%

Sample F3-9 2.6%

Sample F3-10 2.8%



Sludge Survey Summary Table

Pond

Water

Level

(m)

Avg.

Pond

Depth

(m)

Avg.

Depth

to

Sludge

(m)

Avg.

Sludge

Depth

(m)

Max.

Sludge

Depth

(m)

Est.

Total

Pond

Volume

(m3)

Est.

Sludge

Volume

(m3)

Weighted

Average

Sludge

Solids

Content

Est.

Tonnes

Dry

Solids

(tDS)

M1

23.23 1.41 1.12 0.29 0.66 140,340 20,940 0.9% 198

23.20 1.38 1.17 0.21 0.44 137,670 18,430 0.7% 129

M5

22.84 1.11 0.92 0.19 0.51 110,780 15,950 0.4% 71

22.64 0.91 0.82 0.09 0.34 90,570 9,910 1.4% 139

F1

23.66 1.76 1.16 0.60 1.06 176,050 51,930 3.1% 1,596

23.46 1.56 0.99 0.57 1.15 155,320 52,340 2.9% 1,518

F2

23.67 1.88 1.11 0.77 1.50 187,640 71,220 4.0 2,878

23.57 1.78 1.09 0.70 1.35 176,810 66,240 4.8% 3,180

F3

23.55 1.63 1.06 0.57 1.13 163,770 51,170 3.2% 1,701

23.61 1.69 1.11 0.58 1.20 169,760 52,900 3.5% 1,852

Note:

Numbers above in bold are 2015 survey results.

Numbers above in italics are 2014 survey results for comparison.



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 make-up of the composite samples is as follows:

Pond ID Composite Sample IDIndividual Samples making up

the Composite Sample

M1 M1 Comp 1 M1-1 to M1-10

M5 M5 Comp 1 M5-1 to M5-10

F1F1 Comp 1 F1-1, F1-2, F1-3, F1-4, F1-5

F1 Comp 2 F1-6, F1-7, F1-8, F1-9, F1-10

F2F2 Comp 1 F2-1, F2-2, F2-3, F2-4, F2-5

F2 Comp 2 F2-6, F2-7, F2-8, F2-9, F2-10

F3F3 Comp 1 F3-1, F3-2, F3-3, F3-4, F3-5

F3 Comp 2 F3-6, F3-7, F3-8, F3-9, F3-10

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 2014 analysis, and the

Watercare results report is appended.



0.340.11

1.3

1.8

2.5

1.7 1.82.1

0

0.5

1

1.5

2

2.5

3

M1 Comp1

M5 Comp1

F1 Comp 1F1 Comp 2F2 Comp 1F2 Comp 2F3 Comp 1F3 Comp 2

mg

/l

Composite Sample ID

2015 Arsenic (Total)

0.29 0.28

0.871.1

2.0

1.61.3

1.5

0

0.5

1

1.5

2

2.5

M1 Comp1

M5 Comp1


mg

/l

Composite Sample ID

2014 Arsenic (Total)



0.01 0.0038

0.1

0.08

0.11 0.110.1

0.083

0

0.02

0.04

0.06

0.08

0.1

0.12

M1 Comp1

M5 Comp1


mg

/l

Composite Sample ID

2015 Cadmium (Total)

0.011 0.016

0.0730.055

0.130.14

0.07

0.1

00.020.040.060.080.1

0.120.140.16

M1 Comp1

M5 Comp1


mg

/l

Composite Sample ID

2014 Cadmium (Total)



7557

320

280

420 410 420

310

0

50

100

150

200

250

300

350

400

450

M1 Comp1

M5 Comp1

F1 Comp1

F1 Comp2

F2 Comp1

F2 Comp2

F3 Comp1

F3 Comp2

mg

/l

Composite Sample ID

2015 Calcium (Total)

74

120

250210

440 450

260

350

0

50

100

150

200

250

300

350

400

450

500

M1 Comp1

M5 Comp1

F1 Comp1

F1 Comp2

F2 Comp1

F2 Comp2

F3 Comp1

F3 Comp2

mg

/l

Composite Sample ID

2014 Calcium (Total)



0.740.37

3.83.6

5.4

4.94.6

4.1

0

1

2

3

4

5

6

M1 Comp1

M5 Comp1

F1 Comp1

F1 Comp2

F2 Comp1

F2 Comp2

F3 Comp1

F3 Comp2

mg

/l

Composite Sample ID

2015 Chromium (Total)

0.74

1.2

2.8 2.8

5.6 5.5

3.3

4.4

0

1

2

3

4

5

6

M1 Comp1

M5 Comp1

F1 Comp1

F1 Comp2

F2 Comp1

F2 Comp2

F3 Comp1

F3 Comp2

mg

/l

Composite Sample ID

2014 Chromium (Total)



2.20.78

18

16

2423

2019

0

5

10

15

20

25

30

M1 Comp1

M5 Comp1

F1 Comp1

F1 Comp2

F2 Comp1

F2 Comp2

F3 Comp1

F3 Comp2

mg

/l

Composite Sample ID

2015 Copper (Total)

2.2 2.7

1312

2625

14

20

0

5

10

15

20

25

30

M1 Comp1

M5 Comp1

F1 Comp1

F1 Comp2

F2 Comp1

F2 Comp2

F3 Comp1

F3 Comp2

mg

/l

Composite Sample ID

2014 Copper (Total)



0.340.14

2.3

1.6

3.8

4.1

2.7

1.7

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

M1 Comp1

M5 Comp1

F1 Comp1

F1 Comp2

F2 Comp1

F2 Comp2

F3 Comp1

F3 Comp2

mg

/l

Composite Sample ID

2015 (Total)

0.66

1.41.8

1.2

4.3

7.5

1.6

2.7

0

1

2

3

4

5

6

7

8

M1 Comp1

M5 Comp1

F1 Comp1

F1 Comp2

F2 Comp1

F2 Comp2

F3 Comp1

F3 Comp2

mg

/l

Composite Sample ID

2014 Lead (Total)



0.37

0.19

1.5

1

1.6

1.8 1.8

1.1

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

2

M1 Comp1

M5 Comp1

F1 Comp1

F1 Comp2

F2 Comp1

F2 Comp2

F3 Comp1

F3 Comp2

mg

/l

Composite Sample ID

2015 Nickel (Total)

0.48

0.85

1.3

0.82

1.8

2.1

1.0

1.8

0

0.5

1

1.5

2

2.5

M1 Comp1

M5 Comp1

F1 Comp1

F1 Comp2

F2 Comp1

F2 Comp2

F3 Comp1

F3 Comp2

mg

/l

Composite Sample ID

2014 Nickel (Total)



3722

120 120

190200

140160

0

50

100

150

200

250

M1 Comp1

M5 Comp1

F1 Comp1

F1 Comp2

F2 Comp1

F2 Comp2

F3 Comp1

F3 Comp2

mg

/l

Composite Sample ID

2015 Phosphorous (Total)

3853

130 130

230 240

150

190

0

50

100

150

200

250

300

M1 Comp1

M5 Comp1

F1 Comp1

F1 Comp2

F2 Comp1

F2 Comp2

F3 Comp1

F3 Comp2

mg

/l

Composite Sample ID

2014 Phosphorous (Total)



41.4

30

26

39 39

34

30

0

5

10

15

20

25

30

35

40

45

M1 Comp1

M5 Comp1

F1 Comp1

F1 Comp2

F2 Comp1

F2 Comp2

F3 Comp1

F3 Comp2

mg

/l

Composite Sample ID

2015 Zinc (Total)

4.35.6

27

22

47 46

27

36

0

5

10

15

20

25

30

35

40

45

50

M1 Comp1

M5 Comp1

F1 Comp1

F1 Comp2

F2 Comp1

F2 Comp2

F3 Comp1

F3 Comp2

mg

/l

Composite Sample ID

2014 Zinc (Total)



3630

96 100

140

180

110

130

0

20

40

60

80

100

120

140

160

180

200

M1 Comp1

M5 Comp1

F1 Comp1

F1 Comp2

F2 Comp1

F2 Comp2

F3 Comp1

F3 Comp2

mg

/l

Composite Sample ID

2015 Ammonium Nitrogen (as N)

4147

120 120

180170

56 57

0

20

40

60

80

100

120

140

160

180

200

M1 Comp1

M5 Comp1

F1 Comp1

F1 Comp2

F2 Comp1

F2 Comp2

F3 Comp1

F3 Comp2

mg

/l

Composite Sample ID

2014 Ammonium Nitrogen (as N)



240

130

730

840

1000

1100

860 870

0

200

400

600

800

1000

1200

M1 Comp1

M5 Comp1

F1 Comp1

F1 Comp2

F2 Comp1

F2 Comp2

F3 Comp1

F3 Comp2

mg

/l

Composite Sample ID

2015 Total Nitrogen (as N)

300

420

730

850

960

880

420 430

0

200

400

600

800

1000

1200

M1 Comp1

M5 Comp1

F1 Comp1

F1 Comp2

F2 Comp1

F2 Comp2

F3 Comp1

F3 Comp2

mg

/l

Composite Sample ID

2014 Total Nitrogen (as N)



0.55% 0.34%

2.8% 2.6%

3.8% 3.7% 3.6%

3.0%

0.00%0.50%1.00%1.50%2.00%2.50%3.00%3.50%4.00%

M1 Comp1

M5 Comp1


Composite Sample ID

2015 Total SuspendedSolids

0.6%1.1%

2.4%2.1%

3.4%3.8%

2.5% 2.7%

0.0%0.5%1.0%1.5%2.0%2.5%3.0%3.5%4.0%

M1 Comp1

M5 Comp1

F1 Comp 1 F1 Comp 2F2 Comp 1 F2 Comp 2 F3 Comp 1F3 Comp 2

Composite Sample ID

2014 Total SuspendedSolids



80.0%

70.6%67.9%

69.2% 68.4% 67.6%69.4% 70.0%

60.0%62.0%64.0%66.0%68.0%70.0%72.0%74.0%76.0%78.0%80.0%82.0%

M1 Comp1

M5 Comp1


Composite Sample ID

2015 Volatile Solids

77.0%

64.5%66.7%

71.4%

67.6%65.8%

72.0%70.4%

58.0%60.0%62.0%64.0%66.0%68.0%70.0%72.0%74.0%76.0%78.0%

M1 Comp1

M5 Comp1


Composite Sample ID

2014 Volatile Solids



6 CONCLUSION

Maturation Pond M1:

The survey confirms the volume of sludge in Pond M1 is approximately 20,940m3, spread

reasonably evenly around the pond with an average sludge depth of 290mm, to a maximum

660mm 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 0.9%. 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 M1 contains approximately 198 dry tonnes

(tDS) of sludge, which equates to Pond M1 being approximately 15% full of sludge. This is very

little increase from the 2014 survey.

Maturation Pond M5:

The survey confirms the volume of sludge in Pond M5 is approximately 15,950m3, spread

reasonably evenly around the pond with an average sludge depth of 190mm, to a maximum

510mm sludge depth.

The sludge samples retrieved from the pond indicate that the average solids content is 0.4%. 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 71 dry tonnes

(tDS) of sludge, which equates to Pond M5 being approximately 14% full of sludge. There appears

to be significantly more sludge in M5 than in 2014, however the solids results were lower resulting

in fewer tonnes dry solids.

Facultative Pond F1:

The survey confirms the volume of sludge in Pond F1 is approximately 51,930m3. 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 600mm. The maximum sludge depth is 1,060mm.



The sludge samples retrieved from the pond indicate that the average solids content is 3.1%.

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 F1 contains approximately 1,596 dry

tonnes (tDS) of sludge, which equates to Pond F1 being approximately 29% full of sludge. The

sludge quantity is almost identical to the 2014 survey result.



build ups of sludge are at the northern end of the pond. The average sludge depth over the whole

pond is 770mm. The maximum sludge depth is 1,500mm.


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.






build ups of sludge are around the perimeter of the pond. The average sludge depth over the whole

pond is 570mm. The maximum sludge depth is 1,130mm.


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.






7. BELL ISLAND TREATMENT PONDS SLUDGE SURVEY DRAWINGS

• Topographical Plan

• Sludge Depth Plan

• Profile Layout

• Cross Sections (Sheets 1-5)

ORIGINAL SIZE

A3

TITLE

OPER.APPR.CHKD.BY

SCALE

PROJECT No.

LOCATION DRAWN

CHECKED

DES. ENG.

PROJ. ENG.

APPROVED

OPERATIONS

REVISIONS

DESCRIPTIONDATENO

REVISION

DRAWING No

REF:

GENERAL NOTES

1. Coordinates in terms of :

2. Elevations in terms of :

3. Contour interval is :

34 Oakleigh Avenue

CONHUR

PO Box 204021

Takanini

East Tamaki

AUCKLAND 2161

Highbrook Mail Centre

SHEET NO.

TOPOGRAPHICAL PLAN

12-13 November 2015

12433-03 0

NELSON

12433

1:4000

C G Smith 03/12/15

G Johnston 04/12/15

. . . . . .

.

NZ Transverse Mercator (Approx.)

Mean Sea Level (Approx.)

0.2m

12433-03

SCALE 1 : 4000

200m1204040 0 80 160

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ORIGINAL SIZE

A3

TITLE

OPER.APPR.CHKD.BY

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PROJECT No.

LOCATION DRAWN

CHECKED

DES. ENG.

PROJ. ENG.

APPROVED

OPERATIONS

REVISIONS

DESCRIPTIONDATENO

REVISION

DRAWING No

REF:

GENERAL NOTES




34 Oakleigh Avenue

CONHUR

PO Box 204021

Takanini

East Tamaki

AUCKLAND 2161


SHEET NO.

SLUDGE DEPTH

12-13 November 2015

12433-03 0

NELSON

12433

1:4000

C G Smith 03/12/15

G Johnston 04/12/15

. . . . . .

.



0.1m

12433-03

SCALE 1 : 4000

200m1204040 0 80 160

F1 POND VOLUME 176,050 m³

F1 SLUDGE VOLUME 51,930 m³

POND VOLUMES as at 13th November 2015

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M1 POND VOLUME 140,340 m³

M1 SLUDGE VOLUME 20,940 m³

M5 POND VOLUME 110,780 m³

M5 SLUDGE VOLUME 15,950 m³

M5

M1

F1

F2

F3

2

ORIGINAL SIZE

A3

TITLE

OPER.APPR.CHKD.BY

SCALE

PROJECT No.

LOCATION DRAWN

CHECKED

DES. ENG.

PROJ. ENG.

APPROVED

OPERATIONS

REVISIONS

DESCRIPTIONDATENO

REVISION

DRAWING No

REF:

GENERAL NOTES




34 Oakleigh Avenue

CONHUR

PO Box 204021

Takanini

East Tamaki

AUCKLAND 2161


SHEET NO.

PROFILE LAYOUT

12-13 November 2015

12433-03 0

NELSON

12433

1:4000

C G Smith 03/12/15

G Johnston 04/12/15

..

. . . .

.



N/A

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DESCRIPTIONDATENO

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REF:

GENERAL NOTES




34 Oakleigh Avenue

CONHUR

PO Box 204021

Takanini

East Tamaki

AUCKLAND 2161


SHEET NO.

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34 Oakleigh Avenue

CONHUR

PO Box 204021

Takanini

East Tamaki

AUCKLAND 2161


SHEET NO.


12-13 November 2015

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34 Oakleigh Avenue

CONHUR

PO Box 204021

Takanini

East Tamaki

AUCKLAND 2161


SHEET NO.


12-13 November 2015

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REVISIONS

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REF:

GENERAL NOTES




34 Oakleigh Avenue

CONHUR

PO Box 204021

Takanini

East Tamaki

AUCKLAND 2161


SHEET NO.


12-13 November 2015

12433-03 0

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REVISIONS

DESCRIPTIONDATENO

REVISION

DRAWING No

REF:

GENERAL NOTES




34 Oakleigh Avenue

CONHUR

PO Box 204021

Takanini

East Tamaki

AUCKLAND 2161


SHEET NO.


12-13 November 2015

12433-03 0

NELSON

12433

Hz 1:2500 Vert 1:250

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G Johnston 04/12/15

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www.watercarelabs.co.nz [email protected]

52 Aintree Ave,

PO Box 107028,

Auckland Airport,

Auckland

142 Esk Street,

PO Box 747,

Invercargill, 9840

74 Glenda Drive,

PO Box 2614,

Wakatipu,

Invercargill Queenstown

(09) 539 7614

(09) 539 7601

(03) 214 4040

(03) 214 4041

(03) 409 0559Tel:

Fax:

Laboratory Reference:151116-121Certificate of Analysis

CONHUR LTDClient:

Attention: Mark McLaughlin

Report Issue Date: 26-Nov-2015

160779-0Final Report:

PO Box 204021, HIGHBROOK, 2161Address: Received Date: 16-Nov-2015

Client Reference: Bells Island WWTP Nelson

Purchase Order: 21005 6270Quote Reference :

Sample Details SOLIDS SOLIDS SOLIDS SOLIDS

Lab Sample ID:

Client Sample ID:

Sample Date/Time:

151116-121-1 151116-121-2 151116-121-3 151116-121-4

13/11/2015 13/11/2015 13/11/2015 13/11/2015

Description: F-1-1 F-1-2 F-1-3 F-1-4

General Testing

4.90.8%Total Solids 4.73.2


Lab Sample ID:

Client Sample ID:

Sample Date/Time:

151116-121-5 151116-121-6 151116-121-7 151116-121-8

13/11/2015 13/11/2015 13/11/2015 13/11/2015


General Testing



Lab Sample ID:

Client Sample ID:

Sample Date/Time:

151116-121-9 151116-121-10 151116-121-11 151116-121-12

13/11/2015 13/11/2015 13/11/2015 13/11/2015


General Testing



Lab Sample ID:

Client Sample ID:

Sample Date/Time:

151116-121-13 151116-121-14 151116-121-15 151116-121-16

13/11/2015 13/11/2015 13/11/2015 13/11/2015


General Testing



Lab Sample ID:

Client Sample ID:

Sample Date/Time:

151116-121-17 151116-121-18 151116-121-19 151116-121-20

13/11/2015 13/11/2015 13/11/2015 13/11/2015


General Testing



Lab Sample ID:

Client Sample ID:

Sample Date/Time:

151116-121-21 151116-121-22 151116-121-23 151116-121-24

13/11/2015 13/11/2015 13/11/2015 13/11/2015


Page 1 of 5Report Number: 160779-0 Watercare Laboratory Services

General Testing



Lab Sample ID:

Client Sample ID:

Sample Date/Time:

151116-121-25 151116-121-26 151116-121-27 151116-121-28

13/11/2015 13/11/2015 13/11/2015 13/11/2015


General Testing



Lab Sample ID:

Client Sample ID:

Sample Date/Time:

151116-121-29 151116-121-30 151116-121-31 151116-121-32

13/11/2015 13/11/2015 12/11/2015 12/11/2015

Description: F-3-9 F-3-10 M-1-1 M-1-2

General Testing



Lab Sample ID:

Client Sample ID:

Sample Date/Time:

151116-121-33 151116-121-34 151116-121-35 151116-121-36

12/11/2015 12/11/2015 12/11/2015 12/11/2015

Description: M-1-3 M-1-4 M-1-5 M-1-6

General Testing



Lab Sample ID:

Client Sample ID:

Sample Date/Time:

151116-121-37 151116-121-38 151116-121-39 151116-121-40

12/11/2015 12/11/2015 12/11/2015 12/11/2015


General Testing



Lab Sample ID:

Client Sample ID:

Sample Date/Time:

151116-121-41 151116-121-42 151116-121-43 151116-121-44

12/11/2015 12/11/2015 12/11/2015 12/11/2015


General Testing



Lab Sample ID:

Client Sample ID:

Sample Date/Time:

151116-121-45 151116-121-46 151116-121-47 151116-121-48

12/11/2015 12/11/2015 12/11/2015 12/11/2015


General Testing


Sample Details SOLIDS SOLIDS WATERS WATERS

Lab Sample ID:

Client Sample ID:

Sample Date/Time:

151116-121-49 151116-121-50 151116-121-51 151116-121-52

12/11/2015 12/11/2015 13/11/2015 13/11/2015

Description: M-5-9 M-5-10 F1 Comp 1 F1 Comp 2

General Testing

96-mg/LAmmoniacal Nitrogen (as N) 100-

730-mg/LTotal Nitrogen (as N) 840-

120-mg/LTotal Phosphorus (as P) 120-

-0.1%Total Solids -0.1

28000-mg/LTotal Suspended Solids 26000-


Sample Details (continued) SOLIDS SOLIDS WATERS WATERS

Lab Sample ID:

Client Sample ID:

Sample Date/Time:

151116-121-49 151116-121-50 151116-121-51 151116-121-52

12/11/2015 12/11/2015 13/11/2015 13/11/2015

Description: M-5-9 M-5-10 F1 Comp 1 F1 Comp 2

General Testing

19000-mg/LVolatile Solids 18000-

Metals

Total Metals by ICP-MS—Trace (Default Digest)

1.3-mg/LArsenic (Total) 1.8-

0.10-mg/LCadmium (Total) 0.080-

320-mg/LCalcium (Total) 280-

3.8-mg/LChromium (Total) 3.6-

18-mg/LCopper (Total) 16-

2.3-mg/LLead (Total) 1.6-

1.5-mg/LNickel (Total) 1.0-

61-mg/LPotassium (Total) 58-

30-mg/LZinc (Total) 26-

Sample Details WATERS WATERS WATERS WATERS

Lab Sample ID:

Client Sample ID:

Sample Date/Time:

151116-121-53 151116-121-54 151116-121-55 151116-121-56

13/11/2015 13/11/2015 13/11/2015 13/11/2015

Description: F2 Comp 1 F2 Comp 2 F3 Comp 1 F3 Comp 2

General Testing

110140mg/LAmmoniacal Nitrogen (as N) 130180

8601000mg/LTotal Nitrogen (as N) 8701100

140190mg/LTotal Phosphorus (as P) 160200

3600038000mg/LTotal Suspended Solids 3000037000

2500026000mg/LVolatile Solids 2100025000

Metals


1.82.5mg/LArsenic (Total) 2.11.7

0.100.11mg/LCadmium (Total) 0.0830.11

420420mg/LCalcium (Total) 310410

4.65.4mg/LChromium (Total) 4.14.9

2024mg/LCopper (Total) 1923

2.73.8mg/LLead (Total) 1.74.1

1.81.6mg/LNickel (Total) 1.11.8

6368mg/LPotassium (Total) 6469

3439mg/LZinc (Total) 3039

Sample Details WATERS WATERS

Lab Sample ID:

Client Sample ID:

Sample Date/Time:

151116-121-57 151116-121-58

12/11/2015 12/11/2015

Description: M1 Comp 1 M5 Comp

General Testing

36mg/LAmmoniacal Nitrogen (as N) 30

240mg/LTotal Nitrogen (as N) 130

37mg/LTotal Phosphorus (as P) 22

5500mg/LTotal Suspended Solids 3400

4400mg/LVolatile Solids 2400

Metals


0.34mg/LArsenic (Total) 0.11

0.010mg/LCadmium (Total) 0.0038

75mg/LCalcium (Total) 57

0.74mg/LChromium (Total) 0.37

2.2mg/LCopper (Total) 0.78

0.34mg/LLead (Total) 0.14

0.37mg/LNickel (Total) 0.19


Sample Details (continued) WATERS WATERS

Lab Sample ID:

Client Sample ID:

Sample Date/Time:

151116-121-57 151116-121-58

12/11/2015 12/11/2015

Description: M1 Comp 1 M5 Comp

Metals


39mg/LPotassium (Total) 36

4.0mg/LZinc (Total) 1.4

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.

The sample(s) referred to in this report were analysed by the following method(s)

Reference Methods

Analyte MDLMethod Reference Samples Location

General Testing

MEWAM, HMSO 1981, ISBN 0117516139 51, 52, 53, 54, 55,

56, 57, 58

0.4 mg/L AucklandAmmoniacal Nitrogen (as N) by Colorimetry/Discrete Analyser

APHA (online edition) 4500-P J, 4500-NO3 F (

modified)

51, 52, 53, 54, 55,

56, 57, 58

0.010 mg/L AucklandTotal Nitrogen (as N) by Persulphate Digestion and Flow Analysis

APHA (online edition) 4500-P J (modified) 51, 52, 53, 54, 55,

56, 57, 58

0.004 mg/L AucklandTotal Phosphorus (as P) by Persulphate Digestion and Colorimetry/Discrete Analyser

APHA (online edition) 2540 G 1, 2, 3, 4, 5, 6, 7,

8, 9, 10, 11, 12,

13, 14, 15, 16, 17,

18, 19, 20, 21, 22,

23, 24, 25, 26, 27,

28, 29, 30, 31, 32,

33, 34, 35, 36, 37,

38, 39, 40, 41, 42,

43, 44, 45, 46, 47,

48, 49, 50

% AucklandTotal Solids by Gravimetry

In House based on APHA (online edition)

2540 D, E

51, 52, 53, 54, 55,

56, 57, 58

1 mg/L AucklandTotal Suspended Solids by Gravimetry

In House based on APHA (online edition)

2540 D, E

51, 52, 53, 54, 55,

56, 57, 58

1 mg/L AucklandVolatile Solids by Gravimetry

Metals


EPA 200.8, APHA (online edition) 3125 or In-

House method by ICP-MS

51, 52, 53, 54, 55,

56, 57, 58

0.00010 mg/L AucklandArsenic (Total)



51, 52, 53, 54, 55,

56, 57, 58

0.00005 mg/L AucklandCadmium (Total)



51, 52, 53, 54, 55,

56, 57, 58

0.010 mg/L AucklandCalcium (Total)



51, 52, 53, 54, 55,

56, 57, 58

0.00010 mg/L AucklandChromium (Total)



51, 52, 53, 54, 55,

56, 57, 58

0.0002 mg/L AucklandCopper (Total)



51, 52, 53, 54, 55,

56, 57, 58

0.00010 mg/L AucklandLead (Total)



51, 52, 53, 54, 55,

56, 57, 58

0.00010 mg/L AucklandNickel (Total)



51, 52, 53, 54, 55,

56, 57, 58

0.05 mg/L AucklandPotassium (Total)



51, 52, 53, 54, 55,

56, 57, 58

0.001 mg/L AucklandZinc (Total)

Preparations

APHA (online edition) 3030 E (modified, 4:1

Nitric:Hydrochloric Acid)

51, 52, 53, 54, 55,

56, 57, 58

AucklandDigest for Total Metals in Liquids

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.


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 26/11/2015

John Chang

KTP Signatory


sludge survey report 12-11-15

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