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Coastal Water Quality Standards


Classification of Coastal Waters
Class Description
1 Preservation Areas
The water is preserved as natural conditions and its beneficial uses include the following:
  1. Scientific research and/or demonstration. These activities, such as scientific observation, monitoring, etc., must not alter the natural surroundings.
  2. Activities related to aesthetic and natural beauty.
  3. Activities related to management and conservation which do not alter the environment.
2 Coral conservation in coral communities area.
3 Conservation of other natural resources such as mangrove, wildlife habitat, reproduction zone, nursery zone, and nutrition zone for marine organisms.
4 Areas for coastal aquaculture activities such as shellfish, prawns, fish.
5 Water contact sport, such as swimming.
6 Water proximity sport, such as sailing.
7 Industrial zone where water is used for industrial activities such as mining or used as receiving water for industrial effluent. After effluent discharge, the water quality must be within set standards.

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Coastal Water Quality Standards
Parameter Unit Class 1 Class 2 Class 3 Class 4 Class 5 Class 6 Class 7 Methods for Examination
1.Floatable solids - n NOB* NOB* NOB* NOB* NOB* NOB* Visual Testing
2. Floatable oil/grease - n NV NV NV NV NV NV Visual Testing
3. Color/odor - n - - NOB NOB NOB NOB color-Visual Testing
odor-Organolaptic
4.Temperature oC n »33.0 »33.0 »33.0 - - ±3.0 Thermometer
5. pH - n 7.5 - 8.9 7.5 - 8.5 7.5 - 8.5 - - ** Electrometric pH Meter
6. Salinity ppt n 29- 35 »10% »10% - - ** Refractometer
7. Transparency m n ±10% ±10% ±10% ±10% - ** White Secchi Disc , Diameter 30 cm.
8. Dissolved Oxygen (DO) mg/l n «4 «4 «4 - - ** Azide Modification
9. Total Coliform Bacteria MPN/100 ml n - - »1,000 »1,000 - - Multiple Tube Fermentation Technique
10. Fecal coliform Bacteria MPN/100 ml n - - n - - ** Multiple Tube Fermentation Technique
11. NO3 -N mg/l n n n n - - ** Cadmium Reduction
12. PO4 -P mg/l n n n n - - ** Ascorbic Acid
13. Mercury (Hg) mg/l n »0.0001 »0.0001 »0.0001 - - »0.0001 Atomic Absorption Cold Vapour Technique
14.Cadmium (Cd) mg/l n »0.005 »0.005 »0.005 - - »0.005 Atomic Absorption Spectrophotrometry (Flameless Technique)
15. Chromium (Cr) mg/l n »0.1 »0.1 »0.1 - - ** Atomic Absorption Spectrophotrometry (Flameless Technique)
16. Chromium hexavalent mg/l n »0.05 »0.05 »0.05 - - »0.1 Atomic Absorption Spectrophotrometry (Flameless Technique)
17. Lead (Pb) mg/l n »0.05 »0.05 »0.05 - - ** Atomic Absorption Spectrophotrometry (Flameless Technique)
18. Copper (Cu) mg/l n »0.05 »0.05 »0.05 - - ** Atomic Absorption Spectrophotrometry (Flame Technique)
19. Manganese (Mn) mg/l n »0.1 »0.1 »0.1 - - ** Atomic Absorption Spectrophotrometry (Flame Technique)
20. Zinc (Zn) mg/l n »0.1 »0.1 »0.1 - - ** Atomic Absorption Spectrophotrometry (Flame Technique)
21. Iron (Fe) mg/l n »0.3 »0.3 »0.3 - - ** Atomic Absorption Spectrophotrometry (Flame Technique)
22. Fluoride (F) mg/l n »1.5 »1.5 »1.5 - - ** Colorimetric SPANDS with Distillation
23. Residue Cl2 mg/l n »0.01 »0.01 »0.01 - - ** Iodometric Method
24. Phenols mg/l n »0.03 »0.03 »0.03 - - ** Distillation, 4-Amino antipyrene
25. NH3 mg/l n »0.4 »0.4 »0.4 - - ** Distillation Nesslerization
26. Sulfide mg/l n »0.01 »0.01 »0.01 - - ** Colorimetric, Methylene Blue
27. CN- mg/l n »0.01 »0.01 »0.01 - - ** Pyridine- Babituric Acid
28. PCB mg/l n n n n - - ** Gas-Chromatography
29. Total Chlorinated Pesticides ug/l n »0.05 »0.05 »0.05 - - ** Gas-Chromatography
30.Radioactivity Low Background Proportional Counter
- Alpha Gross Becquerel/l n »0.1 »0.1 »0.1 - - **
- Beta Gross Becquerel/l n »1.0 »1.0 »1.0 - - **

Remarks: NOB = not objectionable
NV = not visible
n = natural condition
* = natural floatable solids not included
** = may be established as necessary
» = not more than
« = not less than
± = change from natural condition
Base on Standard Methods for the Examination of Water and Wastewater recommended by APHA : American Public Health Association, AWWA : American Water Works Association and WPCF : Water Pollution Control Federation
Source: Notification of the National Environmental Board No.7, dated January 20, B.E.2537(1994), issued under the Enhancement and Conservation of National Environmental Quality Act B.E.2535(1992), published in the Royal Government Gazette Vol. 111, Part 16, dated February B.E.2537 (1994).

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Areas Classification for the West Coast of Phuket Island
Class Areas
1
(Natural Preservation Areas)
  • Naiyang Beach National Park
    (Naitorn, Naiyang, Maikao and Saikaew Beach)
    The total area is as specified in the Notification of the Forestry Department, B.E. 2524 (1981).
2
(Coral Conservation)
  • Kata Noi Bay (southern part)
  • Karon Bay (southern part), around Pu Island and Kata Bay (northern part)
  • Maingarng Peninsular and Kata Noi Bay - Patong Bay (southern and northern)
  • Kamala Bay (southern part)
    The areas for coral conservation of Patong Bay (both northern and southern parts) and Maingarng Peninsula are as specified in the Provincial Notification (Phuket: Notification on Area for Marine Life Conservation, 15 May B.E. 2532). The areas of Kata Bay (northern part), Karon Bay (southern part), the area around Pu Island and Kamala Bay (southern part), are as proposed by the Phuket Biological and Marine Fishery Institute on 8 February B.E. 2534 (1991).
5
(Water Contact Sports)
  • Nai Harn Beach, Kata Noi & Kata Yai Beach
  • Karon Bay, Patong Beach, Surin Beach
6
(Water Proximity Sports)
  • Kamala Bay
7
(Industrial Area)
  • Bangtao Bay

Remark: Draft Notification of Pollution Control Department, approved by the Environmental Committee on Water, dated November 14, B.E. 2534 (1992).




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