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Using Current Irish Drinking Water Legislation Identify the Parameters of Concern: Drinking Water Data Assignment, IT Sligo

University Institute of Technology (IT) Sligo
Subject Drinking Water Data

Your Task:

Attached are three sets of data from raw water samples. These are typical examples of waters that enter a drinking water treatment plant. Your task is to review the samples and complete the following tasks.

Part 1: For each sample complete the following;

  1. Using current Irish drinking water legislation identify the parameters of concern (parameters that exceed the limit set in the legislation)?
  2. To the best of your ability, interpret the data to determine the type of water sample and issues that might cause the exceedances.

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Part 2: Briefly, answer these specific questions;

  1. Biologically, what is the difference between cryptosporidium & coliform bacteria?
  2. What type of waters might have elevated levels of arsenic and why?
  3. What is ‘conductivity’ in waters, what is its limit in the current Irish legislation, and why do we monitor it?
  4. What is ‘turbidity’ and if we found it at a consumer’s tap what might it indicate?

Water Sample Number 1:              

Raw Chlorinated UV Other
X
Part Parameter DWT Limit Result Notes
A.  Microbiology Coliforms 0 cfu/100ml 2420
E. coli 0 cfu/100ml <1
C. perfringens 0 cfu/100ml 12
B. Chemical Arsenic 10 ug/l < 4.0
Boron 1 mg/l < 0.02
Cadmium 5 ug/l < 1.0
Chromium 50 ug/l < 4.0
Copper 2 mg/l < 0.04
Lead 10 ug/l < 4.0
Nickel 20 ug/l < 4.0
Nitrate 50 mg/l < 2.0
Nitrite 0.5 mg/l < 0.02
Pesticides 0.5 ug/l (total)
Selinium 10 ug/l < 4.0
C. Indicator Aluminium 200 ug/l < 20
Ammonium 300ug/l as NH4 < 0.03
Colour Acceptable (NTU) <  20
Conductivity 2500 us/cm 518
pH 6.5 to 9.5 7.4
Iron 200 ug/l 27
Manganese 50 ug/l 91
Odour Acceptable Non Detected
Turbidity <1.0 NTU 0.2
Other Hardness N/A 281
Alkalinity N/A 276
Zinc N/A < 0.04

Water Sample Number 2:

Raw Chlorinated UV Other
X
Part Parameter DWT Limit Result Notes
A. Microbiology Coliforms 0 cfu/100ml 261
E. coli 0 cfu/100ml 2
C. perfringens 0 cfu/100ml 2
B. Chemical Arsenic 10 ug/l
Boron 1 mg/l
Cadmium 5 ug/l
Chromium 50 ug/l
Copper 2 mg/l
Lead 10 ug/l
Nickel 20 ug/l
Nitrate 50 mg/l 43.1
Nitrite 0.5 mg/l < 0.02
Pesticides 0.5 ug/l (total)
Selenium 10 ug/l
C. Indicator Aluminium 200 ug/l < 20
Ammonium 300ug/l as NH4 < 30
Colour Acceptable (NTU) 2.3
Conductivity 2500 us/cm 847
pH 6.5 to 9.5 7.5
Iron 200 ug/l 60
Manganese 50 ug/l < 20
Odour Acceptable Non Detected
Turbidity <1.0 NTU 1.2
Other Hardness N/A 450
Alkalinity N/A 336
Zinc N/A

Water Sample Number 3:

Raw Chlorinated UV Other
X
Part Parameter DWT Limit Result Notes
A.  Microbiology Colifroms 0 cfu/100ml 24
E. coli 0 cfu/100ml 2
C. perfringens 0 cfu/100ml 28
Enterococci 6
Aerobic Colony Counts at 22DegC/72hrs >300
B. Chemical Arsenic 10 ug/l 8.0
Boron 1 mg/l < 0.02
Cadmium 5 ug/l < 1.0
Chromium 50 ug/l < 4.0
Copper 2 mg/l 0.3
Lead 10 ug/l < 4.0
Nickel 20 ug/l < 4.0
Nitrate 50 mg/l 7.9
Nitrite 0.5 mg/l < 0.02
Pesticides 0.5 ug/l (total)
Selenium 10 ug/l < 4.0
C. Indicator Aluminium 200 ug/l < 20
Ammonium 300ug/l as NH4 < 30
Colour Acceptable (NTU) 8.5
Conductivity 2500 us/cm 347
pH 6.5 to 9.5 7.7
Iron 200 ug/l 46
Manganese 50 ug/l < 20
Odour Acceptable None Detected
Turbidity <1.0 NTU 0.5
Other Hardness N/A 202
Alkalinity N/A 176
Zinc N/A 0.08
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