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Liffey Stream Test Results |
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Test Date: 3rd May 2010 |
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Weather Conditions: Overcast, no wind. There had been below average rain all summer, and no recent rain. |
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| Test |
Excellent |
Satisfactory |
Unsatisfactory |
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Results |
Quality |
| pH |
7.8 |
6.5 - 8.9 |
Less than 6.5 or more than 9 |
6.8 |
Satisfactory |
| Conductivity (µS/cm) |
Less than 100 |
100 - 500 |
More than 500 |
303 |
Satisfactory |
| Dissolved Oxygen (mg/L) |
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7.36 |
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| Oxygen Saturation (%) |
More than 90 |
80 - 90 |
Less than 80 |
69.9% |
Unsatisfactory |
| Nitrate (mg/L) |
Less than 0.15 |
0.15 - 0.5 |
More than 0.5 |
4.9 |
Unsatisfactory
(degraded) |
| Phosphate (mg/L) |
Less than 0.01 |
0.01 - 0.03 |
More than 0.03 |
0.15 |
Unsatisfactory |
| Turbidity (NTU) |
Less than 2 |
2.5 |
More than 5 |
7.89 |
Unsatisfactory |
| Temperature (°C) |
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12.8 |
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| Coliformes |
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3281 |
Degraded |
| E.Coli |
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24 |
Excellent |
| Salmonella |
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19 |
Excellent |
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Conclusions:
The Lincoln Environmental Organisation (LEO) helped by LET and WaterWatch tested the Liffey stream on the 3rd May 2010. We have been testing it for the last few years. We found that from the indicator invertebrates, the water was “degraded”, the Dissolved Oxygen was only 69.9% which is “unsatisfactory”, the dissolved nitrate level was 4.0 mg/L which is 10 times worse than unsatisfactory, the dissolved phosphate levels were 0.15mg/L (anything higher than 0.5 is unsatisfactory).
The coli count was 3281 CFU’s per 100mL, where over 2000 is counted as degraded, however the count of E.coli and salmonella was very low, which was unusual, as it is usually high. This was probably because it has been very dry with no water runoff. The water in the stream would have come from the springs.
The indicator invertebrates showed the lowest number of species we had ever seen (only 2)
Overall water quality ranking: Degraded Poor
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Additional
Comments:
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Test Date: 4th April, 2009 |
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Weather conditions: Fine
with a light NE wind |
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| Test |
Excellent |
Satisfactory |
Unsatisfactory |
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Results |
Quality |
| pH |
7.8 |
6.5 - 8.9 |
Less than 6.5 or more than 9 |
6.8 |
Satisfactory |
| Conductivity (µS/cm) |
Less than 100 |
100 - 500 |
More than 500 |
303 |
Satisfactory |
| Dissolved Oxygen (mg/L) |
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8.47 |
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| Oxygen Saturation (%) |
More than 90 |
80 - 90 |
Less than 80 |
77.5% |
Unsatisfactory |
| Nitrate (mg/L) |
Less than 0.15 |
0.15 - 0.5 |
More than 0.5 |
7 |
Unsatisfactory
(very degraded) |
| Phosphate (mg/L) |
Less than 0.01 |
0.01 - 0.03 |
More than 0.03 |
0.04 |
Unsatisfactory |
| Turbidity (NTU) |
Less than 2 |
2.5 |
More than 5 |
2.98 |
Satisfactory |
| Temperature (°C) |
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14.8 |
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| Coliformes |
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Not Tested |
| E.Coli |
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Not Tested |
| Salmonella |
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Not tested |
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Conclusions:
Aquatic invertrabrates: Pollution
tolerance rating: Poor
These results could point to the
spring discharge coming from a shallow aquifer. As the nitrate
levels from deeper wells are nowhere near this level.
Overall water quality ranking:
Degraded Poor |
Additional
Comments:
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Test Date: 13th November 2008 |
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Weather Conditions: Fine
with light NE wind, no rainfall at least week before if not longer. |
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| Test |
Excellent |
Satisfactory |
Unsatisfactory |
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Results |
Quality |
| pH |
7.8 |
6.5 - 8.9 |
Less than 6.5 or more than 9 |
7.0 |
Satisfactory |
| Conductivity (µS/cm) |
Less than 100 |
100 - 500 |
More than 500 |
230 |
Satisfactory |
| Dissolved Oxygen (mg/L) |
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7.9 |
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| Oxygen Saturation (%) |
More than 90 |
80 - 90 |
Less than 80 |
77.5% |
Unsatisfactory |
| Nitrate (mg/L) |
Less than 0.15 |
0.15 - 0.5 |
More than 0.5 |
2.0 |
Unsatisfactory
(degraded) |
| Phosphate (mg/L) |
Less than 0.01 |
0.01 - 0.03 |
More than 0.03 |
0.37 |
Unsatisfactory |
| Turbidity (NTU) |
Less than 2 |
2.5 |
More than 5 |
2.00 |
Unsatisfactory |
| Temperature (°C) |
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14.5 |
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| Coliformes |
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1400/100mL |
Unsatisfactory |
| E.Coli |
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885/100mL |
Unsafe for swimming |
| Salmonella |
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77/100mL |
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Conclusions:
Aquatic invertrabrates
used as environmental indicators:
Most dominant group: amphipods - Tolerance rating = Medium
Next most dominant group: segmented worms - Tolerance rating
= Low
Overall water quality ranking:
Degraded Poor |
Additional
Comments: As
we have found last year a big increase in the nitrate levels
from the small spring !
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Test Date: 22nd April 2008 |
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Weather Conditions: Chilly
southerly, fine with some cloud. Rained recently |
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| Test |
Excellent |
Satisfactory |
Unsatisfactory |
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Results |
Quality |
| pH |
7.8 |
6.5 - 8.9 |
Less than 6.5 or more than 9 |
7.2 |
Satisfactory |
| Conductivity (µS/cm) |
Less than 100 |
100 - 500 |
More than 500 |
100.2 |
Satisfactory |
| Dissolved Oxygen (mg/L) |
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8.64 |
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| Oxygen Saturation (%) |
More than 90 |
80 - 90 |
Less than 80 |
78.3% |
Unsatisfactory |
| Nitrate (mg/L) |
Less than 0.15 |
0.15 - 0.5 |
More than 0.5 |
1.0 |
Unsatisfactory
(degraded) |
| Phosphate (mg/L) |
Less than 0.01 |
0.01 - 0.03 |
More than 0.03 |
0.04 |
Unsatisfactory
(degraded) |
| Turbidity (NTU) |
Less than 2 |
2.5 |
More than 5 |
12.00 |
Unsatisfactory |
| Temperature (°C) |
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10.6 |
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| Coliformes |
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1400/100mL |
Unsatisfactory |
| E.Coli |
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885/100mL |
Unsafe for swimming |
| Salmonella |
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77/100mL |
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Conclusions:
Aquatic invertrabrates
used as environmental indicators:
Most dominant group: amphipods - Tolerance rating = Medium
Next most dominant group: segmented worms - Tolerance rating
= Low
Overall water quality ranking:
Degraded Poor |
Additional Comments:
The water testing was arranged
as part of the Lincoln Envirotown monitoring of Lincoln township.
The equipment and expertise was supplied by Lincoln University
Waterwatch team run by Kelvin Nicolle. Local
residents, children, and visitors from Christchurch (Mr and
Mrs Cargo aged 86) carried out the testing with help from
the Lincoln University team and the High school LEO (Lincoln
Environmental Organisation).
The results were generally very
disappointing, although there was less phosphate than the
previous testing, possibly because the recent rain diluted
the water. The high nitrate and phosphate levels probably
come from the spring water.
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Test Date: 7th August 2007 |
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Weather Conditions:
Cloudy |
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| Test |
Excellent |
Satisfactory |
Unsatisfactory |
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Results |
Quality |
| pH |
7.8 |
6.5 - 8.9 |
Less than 6.5 or more than 9 |
6.8 |
Satisfactory |
| Conductivity (µS/cm) |
Less than 100 |
100 - 500 |
More than 500 |
187.3 |
Satisfactory |
| Dissolved Oxygen (mg/L) |
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9.3 |
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| Oxygen Saturation (%) |
More than 90 |
80 - 90 |
Less than 80 |
87.1% |
Satisfactory |
| Nitrate (mg/L) |
Less than 0.15 |
0.15 - 0.5 |
More than 0.5 |
2.1 |
Bad
(degraded) |
| Phosphate (mg/L) |
Less than 0.01 |
0.01 - 0.03 |
More than 0.03 |
0.18 |
Bad
(degraded) |
| Turbidity (NTU) |
Less than 2 |
2.5 |
More than 5 |
5.4 |
Bad |
| Temperature (°C) |
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11.7 |
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| Coliformes |
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284/100mL |
Satisfactory |
| E.Coli |
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157/100mL |
Safe for swimming |
| Salmonella |
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77/100mL |
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Conclusions:
Aquatic invertrabrates
used as environmental indicators:
Most dominant group: amphipods - Tolerance rating = Medium
Next most dominant group: segmented worms - Tolerance rating
= Low
Overall water quality ranking:
Degraded |
Additional Comments:
There had been heavy rain the
previous day before this test.
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