DENR Administrative Order No. 34 (1990)

(NAR) VOL. 1 NO.4 / OCTOBER - DECEMBER 1990

[ DENR ADMINISTRATIVE ORDER NO. 34, March 20, 1990 ]

REVISED WATER USAGE AND CLASSIFICATION/WATER QUALITY CRITERIA AMENDING SECTION NOS. 68 AND 69,

CHAPTER III OF THE 1978 NPCC RULES AND REGULATIONS

SECTION 68. Water Usage and Classification. — The quality of Philippine waters shall be maintained in a safe and satisfactory condition according to their best usages. For this purpose, all waters shall be classified according to the following beneficial usages:

(a) Fresh Surface Waters (rivers, lakes, reservoirs, etc.) Classification Beneficial Use 1 Class AA Public Water Supply Class I. This class is intended primarily for waters having watersheds which are uninhabited and otherwise protected and which require only approved disinfection in order to meet the National Standards for Drinking Water (NSDW) of the Philippines. Class A Public Water Supply Class II. For sources of water supply that will require complete treatment (coagulation, sedimentation, filtration and disinfection) in order to meet the NSDW. Class B Recreational Water Class I. For primary contact recreation such as. bathing, swimming, skin diving, etc. (particularly those designated for tourism purposes). Class C 1) Fishery Water for the propagation and growth of fish and other aquatic resources;

2) Recreational Water Class II (Boatings, etc.) 3) Industrial Water Supply Class I (For manufacturing processes after treatment) Class D 1) For agriculture, irrigation, livestock watering, etc.

2) Industrial Water Supply Class II (e.g. cooling, etc.);3) Other inland waters, by their quality, belong to this classification.

(b) Coastal and Marine Waters Classification Beneficial Use Class SA 1) Waters suitable for the propagation, survival and harvesting of shellfish for commercial purposes;

2) Tourist zones and national marine parks and reserves established under Presidential Proclamation No. 1801; existing laws and/or declared as such by appropriate government agency.

3) Coral reef parks and reserves designated by law and concerned authorities. Class SB 1) Recreational Water Class I (Areas regularly used by the public for bathing, swimming, skin diving, etc.);

2) Fishery Water Class I (Spawning areas for Chanos or chanos "Bangus" and similar species). Class SC 1) Recreational Water Class II (e.g. boating, etc.);

2) Fishery Water Class II (Commercial and sustenance fishing);

3) Marshy and/or mangrove areas declared as fish and wildlife sanctuaries; Class SD 1) Industrial Water Supply Class II (e.g. cooling, etc.);

2) Other coastal and marine waters, by their quality, belong to this classification.

(c) General Provisions on Water Classification 1. Classification of a water body according to a particular designated use or uses does not preclude use of the water for other purposes that are lower in classification provided that such use does not prejudice the quality required for such waters.

2. Water classifications are arranged in the order of the degree of protection required, with Class AA and SA having generally the most stringent water quality, respectively, for fresh surface waters and marine/coastal waters; and Class Dand SD waters have the least stringent water quality for fresh surface waters and marine waters, respectively.

3. The main objective of the water quality criteria is to maintain the minimum conditions necessary to assure the suitability of water for its designated use or classification.

4. Any person regulated under these rules or having a substantial interest in this chapter may seek reclassification of waters by filing a petition with the DENR giving all necessary information to support the petition.

5. All reclassifications of water shall be adopted, only after public notice and hearing and upon affirmative findings by the DENR Regional Office concerned that:

i) The proposed reclassification will establish the present and future most beneficial use of the waters; ii) Such a reclassification is clearly in the public interest, and iii) The proposed designated use is attainable, upon consideration of environmental, technological, social, economic and institutional factors.

6. For purposes of classification or reclassification the following minimum water quality parameters are to be considered:

i) Dissolved oxygen (DO) ii) pH iii) Biochemical Oxygen Demand (BOD) iv) Total Coliform Organisms

SECTION 69. Water Quality Criteria.

(a) Minimum Criteria for Surface Waters. All surface waters of the country shall be free from:

1. Domestic, industrial, agricultural, or other man-induced non-thermal components of discharges which, alone or in combination with other substances or in combination with other components of discharges (whether thermal or non-thermal) i) That settle to form putrescent deposits or otherwise create a nuisance; orii) That float as debris, scum, oil, or other matter in such amounts as to form nuisances; or iii) That produce color, odor, taste, turbidity, or other conditions in such degree as to create a nuisance; or iv) That are acutely toxic; or v) That are present in concentrations which are carcinogenic, mutagenic, or teratogenic to human beings or to significant, locally occurring wildlife or aquatic species; or vi) That pose a serious danger to the public health, safety or welfare.

2. Thermal components of discharges which alone, or in combination with other discharges or components of discharges (whether thermal or nonthermal):

i) That produce conditions so as to create nuisance; or ii) That increase the temperature of the receiving body of water (RBW) so as to cause substantial damage or harm to the aquatic life or vegetation therein or interfere with the beneficial uses assigned to the RBW.

(b) Water Quality Criteria for Fresh Waters.

1. Conventional and Other Pollutants Affecting Aesthetics and Oxygen Demand. — Please refer to Table 1 for the parameters and limits or specifications according to classification and use of the receiving body of water (RBW).

TABLE 1 — WATER QUALITY CRITERIA FOR CONVENTIONAL AND OTHER POLLUTANTS CONTRIBUTING TO AESTHETICS AND OXYGEN

(a) DEMAND FOR FRESH WATERS PARAMETER UNIT CLASS CLASS CLASS CLASS CLASS AA A B C (b) D Color PCU 15 50 (c) (c) (c) (d) ºC rise - 3 3 3 3 Temperature (max. rise in deg. Celsius) pH (range) 6.5-8.5 6.5-8.5 6.5-8.5 6.5-8.5 6.0-9.0 (e) % satn 70 70 70 60 40 Dissolved Oxygen (Minimum) mg/L 5.0 5.0 5.0 5.0 3.0 5-Day 20ºC BOD mg/L 1 5 5 7 (10) 10 (15)Total Suspended mg/L 25 50 (f) (g) (h) Solids Total Dissolved Solidsmg/L 500(i) 1,000(i) - - (i) 1,000 Surfactants (MBAS) mg/L (nil) 0.2(0.5) 0.3(0.5) 0.5 - Oil/Grease mg/L (nil) 1 1 2 5 (Petroleum Ether Extracts) Nitrate as Nitrogen mg/L 1.0 10 (nr) 10 (i) - Phosphate as mg/L (nil) (k) (k) (k) - 0.1 0.2 0.4 Phosphorus Phenolic Substances mg/L (nil) 0.002 (l) (l) 0.005 0.02 as Phenols Total Coliforms MPN/ (m) (m) (m) (m) - 50 1,000 1,000 5,000 100 mL MPN/ or Fecal Coliforms 100mL (m) (m) (m) - - 20 100 200 Chloride as Cl mg/L 250 250 - 350 - Copper mg/L 1.0 1.0 - (o) - 0.05 2. Toxic and other Deleterious Substances. — The maximum limits for these types of pollutants according to classifications or use of the receiving body of water are found in Table 2.

TABLE 2 WATER QUALITY CRITERIA FOR TOXIC AND OTHER DELETERIOUS SUBSTANCES FOR

FRESH WATERS (For the Protection of Public Health) PARAMETER UNIT CLASS CLASS CLASS CLASS CLASS AA A B C D Arsenic (i) mg/L 0.05 0.05 0.05 0.05 0.01 (i) mg/L 0.01 0.01 0.01 0.01 0.05 Cadmium (i) Chromium (hexavalent) mg/L 0.05 0.05 0.05 0.05 (---) Cyanide mg/L 0.05 0.05 0.05 0.05 (---) Lead (i) mg/L 0.05 0.05 0.05 0.05 (---) (i) mg/L 0.002 0.002 0.002 0.002 0.002 Total Mercury Organophosphate mg/L (nil) (nil) (nil) (nil) (nil) Aldrin mg/L 0.001 0.001 - - - DDT mg/L 0.05 0.05 - - - Dieldrin mg/L 0.001 0.001 - - - Heptachlor mg/L (nil) (nil) - - - Lindane mg/L 0.004 0.004 - - - Toxaphane mg/L 0.005 0.005 - - - Methoxychlor mg/L 0.10 0.10 - - - Chlordane mg/L 0.003 0.003 - - - Endrin mg/L (nil) (nil) - - - PCB mg/L 0.001 0.001 - - - Note: 1. Limiting values of organophosphates and organochlorines may in the meantime serve as guidelines inthe interim period pending the procurement and availability of necessary laboratory equipment. For Barium, Cobalt, Fluoride, Iron, Lithium, Manganese, Nickel, Selenium, Silver and Vanadium, the 1978 NPCC Rules and Regulations,

Section 69 may be considered.

2. For footnotes please refer to Table 1.

(c) Coastal and Marine Waters Criteria.

1. Conventional and Other Pollutants Affecting Aesthetics and Oxygen Demand. The criteria for Class SA, SB, SC and SD are found in Table 3.

TABLE 3 WATER QUALITY CRITERIA FOR CONVENTIONAL AND OTHER POLLUTANTS AFFECTING AESTHETICS AND EXERTING OXYGEN

(A) DEMAND FOR COASTAL AND MARINE WATERS.

PARAMETER UNIT CLASS CLASS CLASS CLASS SA SB SC SD

Color PCU (c) (c) (c) (c) Temperature (max. rise in deg. ºC rise 3 3 3 3 Celsius) pH (range) 6.0-8.5 6.0-8.5 6.5-8.5 6.0-9.0 (e) % satn 70 70 70 50 Dissolved Oxygen (Minimum) mg/L 5.0 5.0 5.0 2.0 5-Day 20ºC BOD mg[L 3 5 7 (10) - Total Suspended Solids mg/L (f) (g) (g) (h) Surfactants (MBAS) mg/L 0.2 0.3 0.5 - Oil/Grease mg/L 1 2 3 5 (Petroleum Ether Extract) Phenolic Substances as mg/L (nil) 0.01 (l) - Phenols Total Coliforms MPN/ (m) (m) 5,000 - 70 1,000 100 mL Fecal Coliforms MPN/ (nil) (m) - -100mL 200 Copper mg/L - (n)(o) (o) - 0.02 0.05 NOTE: For footnotes please refer to Table 1.

2. Toxic and Other Deleterious Substances. The maximum limits for toxic and other deleterious substances for waters classified as Class SA, SB, SC and SD waters are found in table 4.

TABLE 4 WATER QUALITY CRITERIA FOR TOXIC AND OTHER DELETERIOUS SUBSTANCES FOR COASTAL

AND MARINE WATERS (For the Protection of Public Health)PARAMETER UNIT CLASS CLASS CLASS CLASS SA SB SC SD (i) mg/L 0.05 0.05 0.05 - Arsenic (i) mg/L 0.01 0.01 0.01 - Cadmium (i) mg/L 0.05 0.1 0.1 - Chromium (hexavalent) Cyanide mg/L 0.05 0.05 0.05 - (i) mg/L 0.05 0.05 0.05 - Lead (i) mg/L 0.002 0.002 0.002 - Total Mercury Organophosphate mg/L (nil) (nil) (nil) - Aldrin mg/L 0.001 - - - DDT mg/L 0.05 - - - Dieldrin mg/L 0.001 - - - Heptachlor mg/L (nil) - - - Lindane mg/L 0.004 - - - Toxaphane mg/L 0.005 - - - Methoxychlor mg/L 0.10 - - - Chlordane mg/L 0.003 - - - Endrin mg/L (nil) - - - PCB mg/L 0.001 - - - Note: 1. Limiting values of organophosphates and organochlorines may in the meantime serve as guidelines in the interim period pending the procurement and availability of necessary laboratory equipment. For Barium, Cobalt, Fluoride, Iron, Lithium, Manganese, Nickel, Selenium, Silver and Vanadium, the 1978 NPCC Rules and Regulations,

Section 69 may be considered.

2. For footnotes please refer to Table 1.

(d) Methods of Analysis. — For purposes of these regulations, any water sample taken for the purpose of classification or for determining compliance with the water quality criteria shall be analyzed in accordance with the methods enumerated in Table 5. The table also applies to determine compliance to effluent regulations.

TABLE 5 APPROVED METHODS OF ANALYSIS PARAMETER METHOD OF ANALYSIS

ARSENIC Silver Diethyldithiocarbamate Method (Colorimetric) BOD 5 Azine Modification (Dilution Technique) BORON Carmine Method (Colorimetric Method) CADMIUM Atomic Absorption Spectrophotometry (West ashing with concentration HNO 3, + HCI) CHLORINATED HYDROCARBONS Gas Chromatography (ECD) CHROMIUM (Hexavalent) Diphenyl Carbazide Colorimetric Method COLOR Visual Comparison Method (Platinum Cobalt Scale) CYANIDE Specific Ion Electrode Method DISSOLVED OXYGEN Azide Modification (Winkler Method), Membrane Electrode (DO meter)FECAL COLIFORMS Multiple-Tube Fermentation Technique or Membrane Filter LEAD Atomic Absorption Spectrophotometry NITRATE AS Bruccine Method for Saline Waters, NITROGEN specific Ion Electrode Meter for Fresh Water OIL AND GREASE Gravimetric Method (Petroleum Ether Extraction) ORGANO PHOSPHORUS Gas Chromatography (FPD) COMPOUNDS POLYCHLORINATED BIPHENYL Gas Chromatography (ECD) (PCB) pH Glass Electrode Method PHENOLIC SUBSTANCES Chloroform Extraction Method PHOSPHATE AS PHOSPHOROUS Stannous Chloride Method SETTLEABLE SOLIDS Imhoff Cone Method SURFACTANTS (MBAS) Methylene Blue Method (Colorimetric) TEMPERATURE Use of Mercury-Filled Thermometer TOTAL COLIFORMS Multiple-Tube Fermentation Technique or Membrane Filter TOTAL MERCURY Cold Vapor Technique (Mercury Analyzer, AAS) TOTAL SUSPENDED SOLIDS Gravimetric Method NOTE: Other methods found in the Philippine Standard Methods for Air and Water Analysis, the "Standard Methods for the Examination of Water and Waste Waters", published jointly by American Public Health Association (APHA), the American Waterworks Association and the Water Pollution Control Federation of the U.S. or in accordance with such other method of analyses as the DENR may prescribe.

(e) Significant Parameters. — As a guide to dischargers and regulatory agencies the significant parameters to be considered for monitoring purposes are indicated in Table 6.

TABLE 6. SIGNIFICANT PARAMETERS FOR SELECTED TYPES OF INDUSTRIES TYPE OF INDUSTRY SIGNIFICANT WASTEWATER PARAMETERS

A. BEVERAGE INDUSTRY BOD 5, pH, Suspended Solids, Settleable Solids, Oil and Grease B. CEMENT, CONCRETE, LIME & pH, Suspended Solids, Dissolved Solids, GYPSUM Temperature C. DAIRY PRODUCT PROCESSING BOD 5, COD, pH, Suspended Solids, Dissolved Solids Settleable Solids D. FERRO ALLOY MFG. Suspended Solids, Chromium (hexavalent) Oil and Grease, Phenols, (electric furnace with wet air pollution Phosphates control) E. FERTILIZER INDUSTRY Chloride, Chromium, Dissolved Solids, Nitrate, Suspended Solids pH, Nitrogen FertilizerIndustry Phosphorus, Suspended Solids, Temperature, Cadmium, Arsenic Phosphate Fertilizer Industry F. GRAIN MILLING INDUSTRY BOD 5, Suspended Solids, Temperature G. INORGANIC CHEMICALS pH, Total Suspended Solids, Total ALKALIES AND CHLORINE Dissolved Solids, Chlorides, Sulfates, INDUSTRY COD, Temperature H. LEATHER TANNING & BOD 5, COD, Chromium, Oil and FINISHING INDUSTRY Grease, pH, Suspended Solids, Color, Dissolved Solids I. LIVESTOCK INDUSTRY BOD 5, COD, Total Suspended Solids, pH, Color, Total Coliforms J. MEAT, FISH AND FRUIT CANNINGBOD 5, COD, Suspended Solids, pH, Oil & Grease, Dissolved Solids K. MEAT PRODUCTS INDUSTRY BOD 5, pH, Suspended Solids, Settleable Solids, Oil and Grease, Total Coliforms, Toxic Materials L. METAL FINISHING INDUSTRY Oil and Grease, Heavy Metals (Cr, Cd, etc.), Suspended Solids, Cyanide M. MINERAL ORE PROCESSING Suspended Solids, Heavy Metals (Hg, (Mining Industry) CN, Cd, etc.), Arsenic N. ORGANIC CHEMICALS BOD 5, COD, pH, Total Suspended INDUSTRY Solids Total Dissolved Solids, Oil (Free- Floating) O. PETROLEUM REFINING BOD 5, Heavy Metals, COD, Oil (Total) INDUSTRY pH, Phenols, Suspended Solids, Temperature Total Dissolved Solids P. PLASTIC MATERIALS & BOD 5, COD, pH, Total Suspended SYNTHETIC INDUSTRY Solids, Oil and Grease, Phenols Q. PULP & PAPER INDUSTRY BOD 5, COD, pH, Total Susp. Solid, E. Coli, Color, Heavy Metals, Dissolved Solids, Oil& Grease, Phenols R. STEEL INDUSTRY Oil and Grease, pH, Cyanide, Phenol, Susp. Solids, Temperature, Chromium S. SUGAR CANE PROCESSING BOD5, pH, Suspended Solids, Oil and INDUSTRY grease T. TEXTILE MILL INDUSTRY BOD 5, COD, pH, Suspended Solids, Chromium, Phenols, Color, Oil and Grease U. THERMAL POWER GENERATIONBOD 5, Color, Chromium, Oil and Grease, pH, Phosphate, Suspended Solids, Temperature This Order shall take effect thirty (30) days after publication in the Official Gazette or any newspaper of general circulation.

APPROVED.

(SGD) FULGENCIO S. FACTORAN, JR. Secretary of the Department of Environment and Natural ResourcesFootnotes 1. In general, this refers to current best beneficial use that is expected to last, at least, for the next 10 to 20 years. In special cases when dictated by political, economic, social, public health, environmental and other considerations, certain waters may be classified according to the intended or future beneficial use (e.g. Pasig River, Tullahan-Tenejeros, etc.) (a) Except as otherwise indicated, the numerical limits in Tables 1 and 3 are yearly average values. Values enclosed in parentheses are maximum values.

(b) For irrigation purposes, SAR should have a minimum value of 8 and a maximum value not to exceed 18. Boron should not exceed 0.75 mg/1.

(c) No abnormal discoloration from unnatural causes (d) The allowable temperature increase over the average ambient temperature, for each month. This rise shall be based on the average of the maximum daily temperature readings recorded at the site but upstream of the mixing zone over a period of one (1) month.

(e) Sampling taken between 9:00 AM and 4:00 PM (f) Not more than 30% increase (g) Not more than 30 mg/L increase (h) Not more than 60.mg/L increase (i) Do not apply if natural background is higher in concentration. The latter will prevail and will be used as baseline.

(j) Applicable only to lakes or reservoirs, and similarly impounded water.

(k) When applied to lakes or reservoirs, the Phosphate as P concentration should not exceed an average of 0.05 mg/L nor a maximum of 0.1 mg/L (l) Not present in concentrations to affect fish flavor/taste (m) These values refer to the geometric mean of the most probable number of coliform organism during a 3-month period and that the limit indicated shall not be exceeded in 20 percent of the samples taken during the same period.

(n) For spawning areas for Chanoschanos and other similar species.

(o) Limit is in terms of dissolved copper nil Extremely low concentration and not detectable by existing equipment --- Means the standard of these substances are not considered necessary for the present time, considering the stage of the country's development and DENR capabilities, equipment and resources.nr Means No Recommendation made (a) Except as otherwise indicated, the numerical limits in Tables 1 and 3 are yearly average values. Values enclosed in parentheses are maximum values.

(b) For irrigation purposes, SAR should have a minimum value of 8 and a maximum value not to exceed 18. Boron should not exceed 0.75 mg/1.

(c) No abnormal discoloration from unnatural causes (c) No abnormal discoloration from unnatural causes (c) No abnormal discoloration from unnatural causes (d) The allowable temperature increase over the average ambient temperature, for each month. This rise shall be based on the average of the maximum daily temperature readings recorded at the site but upstream of the mixing zone over a period of one (1) month.

(e) Sampling taken between 9:00 AM and 4:00 PM (f) Not more than 30% increase (g) Not more than 30 mg/L increase (h) Not more than 60.mg/L increase (i) Do not apply if natural background is higher in concentration. The latter will prevail and will be used as baseline.

(nil) Extremely low concentration and not detectable by existing equipment (nil) Extremely low concentration and not detectable by existing equipment (nr) Means No Recommendation made (l) Applicable only to lakes or reservoirs, and similarly impounded water.

(nil) Extremely low concentration and not detectable by existing equipment (k) When applied to lakes or reservoirs, the Phosphate as P concentration should not exceed an average of 0.05 mg/L nor a maximum of 0.1 mg/L (k) When applied to lakes or reservoirs, the Phosphate as P concentration should not exceed an average of 0.05 mg/L nor a maximum of 0.1 mg/L (k) When applied to lakes or reservoirs, the Phosphate as P concentration should not exceed an average of 0.05 mg/L nor a maximum of 0.1 mg/L(nil) Extremely low concentration and not detectable by existing equipment (l) Not present in concentrations to affect fish flavor/taste (l) Not present in concentrations to affect fish flavor/taste (m) These values refer to the geometric mean of the most probable number of coliform organism during a 3-month period and that the limit indicated shall not be exceeded in 20 percent of the samples taken during the same period.

(m) exceeded in 20 percent of the samples taken during the same period.

(m) These values refer to the geometric mean of the most probable number of coliform organism during a 3-month period and that the limit indicated shall not be exceeded in 20 percent of the samples taken during the same period.

(m) These values refer to the geometric mean of the most probable number of coliform organism during a 3-month period and that the limit indicated shall not be exceeded in 20 percent of the samples taken during the same period.

(m) These values refer to the geometric mean of the most probable number of coliform organism during a 3-month period and that the limit indicated shall not be exceeded in 20 percent of the samples taken during the same period.

(m) These values refer to the geometric mean of the most probable number of coliform organism during a 3-month period and that the limit indicated shall not be exceeded in 20 percent of the samples taken during the same period.

(m) These values refer to the geometric mean of the most probable number of coliform organism during a 3-month period and that the limit indicated shall not be exceeded in 20 percent of the samples taken during the same period.

(o) Limit is in terms of dissolved copper (i) Do not apply if natural background is higher in concentration. The latter will prevail and will be used as baseline.

(i) Do not apply if natural background is higher in concentration. The latter will prevail and will be used as baseline.

(i) Do not apply if natural background is higher in concentration. The latter will prevail and will be used as baseline. (---) Means the standard of these substances are not considered necessary for the present time, considering the stage of the country's development and DENR capabilities, equipment and resources.(---) Means the standard of these substances are not considered necessary for the present time, considering the stage of the country's development and DENR capabilities, equipment and resources.

(i) Do not apply if natural background is higher in concentration. The latter will prevail and will be used as baseline. (---) Means the standard of these substances are not considered necessary for the present time, considering the stage of the country's development and DENR capabilities, equipment and resources.

(i) Do not apply if natural background is higher in concentration. The latter will prevail and will be used as baseline.

(nil) Extremely low concentration and not detectable by existing equipment (nil) Extremely low concentration and not detectable by existing equipment (nil) Extremely low concentration and not detectable by existing equipment (nil) Extremely low concentration and not detectable by existing equipment (nil) Extremely low concentration and not detectable by existing equipment (nil) Extremely low concentration and not detectable by existing equipment (nil) Extremely low concentration and not detectable by existing equipment (nil) Extremely low concentration and not detectable by existing equipment (nil) Extremely low concentration and not detectable by existing equipment (A) Except as otherwise indicated, the numerical limits in Tables 1 and 3 are yearly average values. Values enclosed in parentheses are maximum values.

(c) No abnormal discoloration from unnatural causes (c) No abnormal discoloration from unnatural causes (c) No abnormal discoloration from unnatural causes (c) No abnormal discoloration from unnatural causes (e) Sampling taken between 9:00 AM and 4:00 PM (f) Not more than 30% increase(g) Not more than 30 mg/L increase (g) Not more than 30 mg/L increase (h) Not more than 60.mg/L increase (nil) Extremely low concentration and not detectable by existing equipment (nil) Not present in concentrations to affect fish flavor/taste (m) These values refer to the geometric mean of the most probable number of coliform organism during a 3-month period and that the limit indicated shall not be exceeded in 20 percent of the samples taken during the same period.

(m) These values refer to the geometric mean of the most probable number of coliform organism during a 3-month period and that the limit indicated shall not be exceeded in 20 percent of the samples taken during the same period.

(nil) Extremely low concentration and not detectable by existing equipment (m) These values refer to the geometric mean of the most probable number of coliform organism during a 3-month period and that the limit indicated shall not be exceeded in 20 percent of the samples taken during the same period.

(n) For spawning areas for Chanoschanos and other similar species.

(o) Limit is in terms of dissolved copper (o) Limit is in terms of dissolved copper (i) Do not apply if natural background is higher in concentration. The latter will prevail and will be used as baseline.

(i) Do not apply if natural background is higher in concentration. The latter will prevail and will be used as baseline.

(i) Do not apply if natural background is higher in concentration. The latter will prevail and will be used as baseline.

(i) Do not apply if natural background is higher in concentration. The latter will prevail and will be used as baseline.

(i) Do not apply if natural background is higher in concentration. The latter will prevail and will be used as baseline.

(nil) Extremely low concentration and not detectable by existing equipment(nil) Extremely low concentration and not detectable by existing equipment (nil) Extremely low concentration and not detectable by existing equipment (nil) Extremely low concentration and not detectable by existing equipment (nil) Extremely low concentration and not detectable by existing equipment