| Second sampling locations | |||||||||
| Table 1b | |||||||||
| S.no | Sampling locations | Sampling date dd m y | Gradient | Classification | pH | Temperature | Salinity | Conductivity | |
| Lattitude | Longitude | °C | (ppt) | (mS) | |||||
| 1 | Sembawang Park | 25.12.2001 | 01'.28.20'N | 103'.49.48'E | Shipyard & near Port | 8.3 | 31.0 | 32.0 | 47.9 |
| 2 | Punggol | 25.12.2001 | 01'.25.03'N | 103'.54.08'E | Near port | 8.2 | 31.0 | 31.0 | 47.7 |
| 3 | Pasir Ris | 27.12.2001 | 01'.23.40'N | 103'.57.03'E | Near sailing club | 8.4 | 32.0 | 32.0 | 48.3 |
| 4 | Changi | 25.12.2001 | 01'.28.20'N | 103'.49.48'E | Sailing club/ Naval base | 8.3 | 31.0 | 32.0 | 47.9 |
| 5 | Pulau Tekong (off shore) | 20.12.2001 | 01'.22.04'N | 104'.02.15'E | Shipping lane | 8.1 | 33.0 | 34.0 | 49.5 |
| 6 | Beddok Jetty | 07.01.2002 | 01'.17.52'N | 103'.56.05'E | Shipping lane | 8.6 | 31.0 | 31.0 | 48.5 |
| 7 | East Coast Park | 14.06.2001 | 01.18.42'N | 103'.56.20'E | Shipping lane | 8.04 | 30 | 34 | 49 |
| 8 | Marina East | 01.02.2002 | 01'.17.50'N | 103.52.03'E | Marinas | 8.0 | 32.0 | 32.0 | 50.1 |
| 9 | Off ECP | 07.01.2002 | 01'.10.20'N | 103'.53.06'E | Recreational/ Near Port | 8.2 | 33.0 | 33.0 | 48.5 |
| 10 | Off Marina | 07.01.2002 | 01'.16.17'N | 103'.55.39'E | Shippig lane/ Near Port | 8.3 | 33.0 | 32.0 | 47.0 |
| 11 | Raffles Place | 20.01.2002 | 01'.17.40'N | 103'.50.79'E | Recreational | 8.1 | 32.5 | 33.5 | 48.5 |
| 12 | World Trade Centre | 20.01.2002 | 01.15.86'N | 103.49.35'E | Near Port | 8.1 | 32.0 | 30.5 | 47.0 |
| 13 | Sentosa | 27.12.2001 | 01'.15.15'N | 103'.48.29'E | Recreational/ Near Port | 8.1 | 34.0 | 33.0 | 47.0 |
| 14 | Labrador Park | 05.01.2002 | 01.17.03'N | 103.46.97'E | Shipping lane | 8.4 | 33.0 | 31.0 | 48.6 |
| 15 | Sister's Island | 07.01.2002 | 01'.12.45'N | 103'.49.52'E | Shipping lane/ Refinerries | 8.1 | 32.0 | 31.0 | 48.6 |
| 16 | Pulau Hantu | 17.01.2002 | 01'.13.25'N | 103'.45.30'E | Shipping lane/Refinerries | 8.2 | 32.0 | 33.0 | 50.1 |
| 17 | Sultan Shoal | 06.06.2001 | 01.14.43'N | 103.38.92'E | Shipping lane | 8.0 | 32 | 31 | 49.0 |
| 18 | St. John's Island | 20.12.2001 | 01'.13.42'N | 103'.50.48'E | Recreational | 8.1 | 32.0 | 32.0 | 48.5 |
| 19 | West Coast Park | 05.01.2002 | 01'.17.75'N | 103.43.93'E | Sailing club | 8.1 | 30.0 | 31.0 | 48.8 |
| 20 | Jurong Island | 28.11.2001 | 01'.12.56'N | 103'.47.26'E | Industrial zone | 8.3 | 30.0 | 32.0 | 49.2 |
| 21 | Cyrene Reef | 17.01.2002 | 01'.15.20'N | 103'.45.02'E | Shipping lane/near Industrial zone | 8.1 | 33.0 | 35.0 | 49.3 |
| 22 | Raffles Light house | 17.01.2002 | 01'.09.57'N | 103'.44.55'E | Sailing club/ Near Port | 8.9 | 33.0 | 33.0 | 49.1 |
| 23 | Jurong Pier | 05.01.2002 | 01'.18.58'N | 103.42.69'E | Shipyard | 8.1 | 30.0 | 30.0 | 46.1 |
| 24 | Tuas Jetty | 28.11.2001 | 01'.17.48'N | 103'.36.28'E | Near Industrial zone | 8.1 | 31.0 | 30.0 | 49.0 |
| 25 | Raffles marina (off shore) | 25.12.2001 | 01'.20.41'N | 103'.37.55'E | Sailing club/ Recreational | 8.0 | 32.0 | 32.0 | 48.5 |
| 26 | Sarimbun | 28.11.2001 | 01'.25.39'N | 103'.41.00'E | Near sailing club/Near fish farm | 8.0 | 30.0 | 24.0 | 48.4 |
| 27 | Lim Chu Kang (off shore) | 28.11.2001 | 01'.26.21'N | 103'.41.38'E | Near sailing club/Near fish farm | 7.9 | 30.5 | 28.0 | 48.7 |
| 28 | Kranji (off shore) | 28.11.2001 | 01'.21.10'N | 103'.44.10'E | Recreational | 7.9 | 29.0 | 18.0 | 46.1 |