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Analysis of Bore Water into Koopoolang Pond

The following results have prompted the design and installation of a settling filter tank improve the underground water quality.

 

Analysis

 

Units

Detection

Limits

Result

Test 1

Result

Duplicate

Recommended

Levels

Sodium

Na

mg/L

1

140

130

not stated

Potassium

K

mg/L

0.1

8.3

8.0

not stated

Calcium

Ca

mg/L

0.1

23

22

not stated

Aluminium

Al

µg/L

5

<5

<5

<30

Cadmium

Cd

µg/L

1

<1

<1

<0.8

Chromium

Cr

µg/L

1

<1

<1

<20

Copper

Cu

µg/L

5

<5

<5

<5

Iron

Fe

µg/L

10

4800

4700

<10

Manganese

Mn

µg/L

1

11000

11000

<10

Zinc

Zn

µg/L

5

96

94

<5

Arsenic

As

µg/L

1

<1

<1

<50

Lead

Pb

µg/L

1

<1

<1

<2

 

The recommended levels are taken from “Australian and New Zealand Guidelines for Fresh and Marine Water Quality” published by Australian and New Zealand Environment and Conservation Council and Agriculture and Resource Management Council of Australia and New Zealand 2000

Recommendations:

The water analysed met the Guidelines for Aquaculture of fresh water species with the exception of Iron and Zinc

The Zinc level is well above the guideline value of < 5 µg/l. In contrast the Australian Drinking Water Guideline for Zinc is 3000µg/l.

The Manganese level of 11000µg/l is significantly above the levels quoted in the Guidelines. This Manganese level is significantly higher than those usually encountered in ground and surface waters in the South West. The Australian Drinking Water Guideline for Manganese is 100µg/l. The notes relating to Manganese from the Guidelines states that some references considered a range between 100 and 8000 µg/l was acceptable for fresh water fish. Another source recommended <5000 µg/l for a fish hatchery.

The Iron level at 4750µg/l is well above the quoted guideline of 100µg/l. The Guideline notes have one reference quoting < 2000 µg/l Total Iron, but all other references are much lower.

Reference: South West Chemical Services

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