SCHEDULE XXVI Manipulation of stone or Any Other Material Containing Free Sillica 1. Application..- This schedule shall apply to all factories or parts of factories in which manipulation of stone or any other material containing free silica is carried on. 2. Definitions.- For the purpose of this Schedule- (a) "Manipulation" means crushing, breaking, chipping, dressing, grinding, sieving, mixing, grading or handling of stone or all other material containing free silica or any other operation involving such stone or material; (b) "Stone or any other material containing free silica” means a stone or any other solid material containing not less than 5% by weight of free silica. 3. Precautions in manipulation.- No manipulation shall be carried out in factory or part of a factory unless one or more of the following measures, namely: (a) damping the stone or other material being processed; (b) providing water spray; (c) enclosing the process; (d) isolating the process; and (e) providing localised exhaust ventilation. are adopted so as to effectively control the dust in any place in the factory where any person is employed, at a level equal to or below the maximum permissible lever for silica dust as laid down in Table 2 appended to Rule 95A. Provided that such measures as above said are not necessary if the process or operation itself is such that the level of dust creasted and prevailing does not exceed the permissible level referred to. 4. Maintenance ofloors.- (1) All floors or places where fine dust is likely to settle on and whereon any person has to work or pass shall be of impervious material and maintained in such condition that they can be thoroughly cleaned by a moist method or any other method which would prevent dust being airborne in the process of cleaning. (2) The surface of every floor of every work-room or place where any work is carried on where any person has to pass during the course of his work, shall be cleaned of dust once at least during each shift after being sprayed with water or by any other suitable method so as to prevent dust being airborne in the process of cleaning. 5. Prohibition relating young persons.- No young persons shall be employed or permitted to work in any of the operations involving manipulations or at any place where such operations are carried out. 6. Medical facilities and records of examinations and tests.- (1) The occupier of every factory to which the Schedule-applies, shall- (a) employ a qualified medical officer for medical surveillance of the workers employed therein whose employment shall be subject to the approval of the Chief Inspector of Factories; and (b) provide to the said Medical Officer all the necessary facilities for the purpose referred to in clause (1), (2) the record of medical examination and appropriate tests carried out by the said Medical Officer shall be maintained in a separate register approved by the Chief Inspector of Factories, which shall be kept readily available for inspection by the inspector. 7. Medical examination by Certifying Surgeon.- (1) Every worker employed in the processes specified in paragraph 1, shall be examined by a Certifying Surgeon within 15 days of his first employment. Such medical examination shall include pulmonary function tests and chest X-ray. No worker shall be allowed to work after 15 days of certified fit for such employment by the Certifying Surgeon. (2) Every worker employed in the said processes shall be re-examined by a Certifying Surgeon at least once in every twelve months. Such examination shall, wherever the Certifying Surgeon considers appropriate, include all the tests as specified in sub-paragraph (1) except chest X-ray which will be once in 3 years. (3) The Certifying Surgeon after examining a worker shall issue a certificate of Fitness in Form 5. The record of re-examinations carried out shall be entered in the Certificate and the Certificate shall be kept in the custody of the Manager of the Factory. The record of each examination carried out under sub-paragraphs (1) and (2) , including the nature and the results of tests, shall also be entered by the Certifying Surgeon in a health register in Form 17. (4) The Certificate of fitness and the health register shall be kept readily available for inspection by the Inspector. (5) If at any time the Certifying Surgeon is no longer fit for employment in the said processes on the ground that continuance therein would involve special of danger to the health of the worker, he shall make a record of his findings in those documents shall also include the period for which he considers that the said person is unfit for work in the said processes. 8. Exemptions.- If in respect of any factory, the Chief Inspector is satisfied that owing to the exceptional circumstances or infrequency of the processes or for any other reason, all or any of the provisions of this schedule is not necessary for protection of the workers in the factory, the Chief Inspector may by, a Certificate in writing, which he may in his discretion revoke at any time, exempt such factory from all or any of such provisions subject to such conditions, if an as he may specify therein. 95A.- Permissible levels of certain chemical substances in work environment without prejudice to the requirements in any other provisions in the Act or Rules, the requirements specified in the Schedule below, shall apply to all factories. SCHEDULE I. Definition.- For the purpose of this schedule- (a) "mg/m3", means milligram of a substance per cubic meter of air; (b) "mgpcm" means million particles of a substances per cubic meter of air; (c) "ppm"!neans parts of vapour or gass million parts of air by volume at 25°C and 760 mm of mercury pressure; (d) "Time weighted average concentration" means the average concentration 'of a substance in the air at any work location in a factor computed from evaluation of adequate number of air samples take at that location, spread over the entire shift on any day, after giving weightage to the duration for which each such sample is collected and the concentration prevailing at the time of taking the sample. Time weighted average .C1TI-C2T2+ CnTn ConcentratIon = T + T 2+ T In where C1 represents the concentration of the substance for duration T (in hours); C2 represents the concentration of the substance for duration T2 (in hours); and Cn represents the concentration of the substance for duration Tn, (in hours). (e) "work location" means a location in a factory at which worker works or may be required to work at any time during any shift on any day, 2. Limits of concentrations of substances at work location.- (1) The time weighted average concentration of any substance listed in Table 1 or 2 of the schedule, at any work location in a factory during any shift on any day shall not exceed the limit of the permissible time weighted average concentration specified in respect of that substance, Provided that in the case of a substance mentioned in Table in respect of which a limit in terms of short term maximum concentration in indicated, the concentration of such a substance may exceed the permissible limit of the two weighted average concentration for the substance for short periods not exceeding 15 minutes at a time, subject to the conditions that- (a) Such periods during which the concentration exceeds the prescribed time weighted average concentration are restricted to not more than 4 per shift; (b) The time interval between any two such periods of higher exposure shall not be less than 60 minutes; and (c) At no time the concentration of the substance in the air shall exceed the limit of short term maximum concentration. (2) In the case of any substance given in Table 3, the concentration of the substance at any work location in a factory at any time during any day shall not exceed the limit of exposure for that substance specified in the table, (3) In the case where the word "skin" has been indicated against certain substance mentioned in Tables 1 and 3, appropriate measures shall be taken to prevent absorption through cutaneous routes particularly slim, mucous membrane and eyes as the limits, specified in these Tables are for conditions where the exposure is only through respiratory tract, (4) (a) In case, the air of any work location contains a mixture of such substances mentioned in Tables 1, 2 or 3 which have similar toxic properties, the time weighted concentration of each of these substances during the shift should be such, that when these time, weighted concentration divided by the respective permissible time weighted average concentration specified in the above mentioned tables, and the fractions obtained are added together, the total shall not exceed unity, C + C "",',',"""""' C i.e. J 2 n should not exceed unity, LJ + L2 """"""""""' Ln where, C , C .,.,"" Care the time weighted concentration of toxic J 2 n substances 1, 2 ""'.'. and n respectively, determined after measurement at work location; and 11, 12 1n are the permissible time weighted average concentration of the toxic substances 1,2 and n respectively. (b) In case the air at any work location contains a mixture of substance, mentioned in Tables 1,2 or 3 and these do not have similar toxic properties, then the time weighted concentration of each of these .- substances shall not exceed the permissible time weighted average concentration specified in the above mentioned Tables, for that particular substance. (c) The requirement in clauses (a) and b) shall be in addition to the requirement in paragraphs 2(1) and 2(2). 3. Sampling and evaluation procedures.- (1) Not withstanding provision in any other paragraphs, the sampling and evaluation procedures to be adopted for checking compliance with the provisions in the schedule shall be as per , standard procedures in vogue from time to time. (2) Notwithstanding the provisions in paragraph 5, the following condition regarding the sampling and evaluation procedures relevant to checking compliance with the provisions in this schedule are specified- (a) For determination of the number of particles per cubic meter in item 1 (a) (i) (1) in Table 2, samples are to be collected by standard or midget imipinger and the counts made by light-field technique. (b) The percentage of quartz in the 3 formulas given in item 1 (a) (i) in Table 2 is to be determined from air born samples. (c) For determination of number of fibres as specified in item 2 (a) of Table 2, the membrance filter method at 430 phase contract should be used. (e) Both for determination of concentration and percentage of quartz for use of the formula given in item 1 (a) (i) (2) of Table 2, the fraction passing through a size selector with the following characteristics should only be considered. Aerodynamic meter unit don | Percentage allowed by size.- selector | 2.0 | 90 | 2.5 | 75 | 3.5 | 50 | 5.0 | 25 | 10.0 | 5 |
4. Power to require assessment of concentration of substances________ (1) An Inspector may, by an order in writing direct the occupier or manager of a factory to get before any specified date, the assessment of the time weighted average concentration at any work location of any of the substances mentioned in Table 1,2 and 3 carried out. (2) The results of such assessment as well as the method followed for air sampling and analysis for such assessment shall be sent to Inspector within 3 day from the date of completion of such assessment and also a record of the same kept readily available for inspection by an Inspector. 5. Exemption________ If in respect of any factory or a part of a factory, the Chief Inspector is satisfied that, by virtue of the pattern of working time of the wokers at different work locations or an account of other circumstances no worker is exposed in the air at the work locations, to a substance or substances specified in tables 1,2or 3 to such an extent as is likely to be injurious to his heath, he (the Chief Inspector) may by an order in writing, exempt the factory or a part of the factory form the requirement in paragraph 2, subject to such conditions, if any as he may specify therein. TABLE-1 | Permissible limit exposure | Substance | Time-weighted average Concentration | Short term maximum Concentration | | ppm | mg/m3 | ppm | mg/m3 | Acetic Acid | 10 | 25 | 15 | 37 | Acrolin | 0.1 | 0.25 | 0.3 | 0.0 | Aldrin | - | 0.25 | - | 0.75 | Ammonia | - | 10 | 35 | 27 | Aniline-skin | - | 10 | 5 | 20 | Anisidine (10-p-isomers)-skin | 0.1 | 0.5 | - | - | Arsenic & Compounds (as An) | - | 0.2 | - | - | Benzene | 10 | 30 | - | - | Bromine | 0.1 | 0.7 | 0.3 | 2 | 2 Butanene methylethyl | 200 | 590 | 300 | 885 | Ketene-MEK | | | | | n-butyl acetate | 150 | 710 | 200 | 950 | Sec./tert. Buty-acetate | 20 | 950 | 250 | 1190 | Cadmium-dust and salts (as Cd) | - | 0.05 | - | 0.2 | Calcimum oxide | - | 2 | - | - | Carbaryl (Sovin) | - | 5 | - | 10 | Carbofuran (Furaden) | - | 0.1 | - | - | Carbon disulfide-skin | 2 | 60 | 30 | 90 | Carbon monoxide | 50 | 55 | 400 | 440 | Carbon tetrachloride-skin | 10 | 65 | 20 | 130 | Carbonyl chloride (Phosgene) | 0.1 | 0.4 | - | - | Chlordance-skin | - | 0.5 | - | 2 | chlorobenzene (mono) | 75 | 350 | - | - | chlorobenzene | | | | | Chlorine | 1 | 3 | 3 | 3 | Bis-Chloremethyl ether | 0.001 | - | - | - | Chromic acid and chromic, (as Cr) | - | - | - | - | Chromium sel. Chromic, | - | 0.8 | - | - | Chremous salts (as Cr) | | | | | Copper fume | - | 0.3 | - | 0.6 | Cottom dust, raw | - | 0.3 | - | - | Cresol all isomers-skin | 5 | 22 | - | - | Cyanides, (as (Cn)-skin | - | 5 | - | - | Cyanogen | 10 | 20 | - | - | DDT Dichlorodiphenyltrichlore then) | - | 1 | - | 3 | Demeton-skin | 0.01 | 0.1 | 0.03 | 0.3 | Dizzion-skin | - | 0.1 | - | 0.3 | Dibutyl phthalate | - | 5 | - | 10 | Dichlorves (DDVP)-skin | 0.1 | 1 | 0.03 | 3 | Dieldrin-skin | - | 0.25 | - | 0.75 | Dinitrobenzenes (all isomers) skin | 0.15 | 1 | 0.5 | 3 | Dinitrotoluence-skin | - | 1.6 | - | 5 | Diphenyl | 0.2 | 1.6 | 0.6 | 4 | Endosulfan (Thiodes)-skin | - | 0.1 | - | 0.3 | Endrin_skin | - | 0.1 | - | 0.3 | Ethylacetate | 400 | 1000 | - | - | Ethyl alcohol | 1000 | 1900 | - | - | Ethyl amino | 10 | 18 | - | - | Fluorides (as F) | - | 2.5 | - | - | Flourine | 1 | 2 | 2 | 4 | Hydrogen Cyanide-skin | 10 | - | 15 | 16 | Hydrogen sulfide | 10 | 15 | 15 | 27 |
Iron oxide fume (FO2 O3 as Fe) | - | 5 | - | 10 | isoamyl acetate | 100 | 525 | 125 | 655 | Isoamyl alcohol | 100 | 360 | 125 | 450 | Isobutyl alcohol | 50 | 150 | 75 | 225 | Lead, inorg. Fumes and dust (as Pb) | - | 0.15 | - | 0.45 | Lindane-skin | - | 0.5 | - | 1.5 | Molethion-skin | - | 10 | - | - | Managanese fume (as Mn) | - | 1 | - | 3 | Mercury (as Hg) | - | 0.5 | - | 0.15 | Mercury calkyl compounds) skin(as Hg) | 0.001 | 0.01 | 0.003 | 0.03 | Methyl alcohol (methanol) skin | 200 | 260 | 250 | 310 | Methyl cellesolve-skin (2-metlhyl ethanol) | 25 | 88 | 35 | 120 | Naphthalene | 100 | 410 | 125 | 510 | Nickel carbonyl(as Ni) | 10 | 50 | 15 | 75 | Nitric Acid | 0.5 | 0.35 | - | - | Nitric oxide | 2 | 5 | 4 | 10 | Nitric oxide | 25 | 30 | 35 | 45 | Nitrobenzene-skin | 1 | 5 | 2 | 10 | Oil-mist-mineral | - | 5 | - | 10 | Parathion-skin | - | 0.1 | - | 0.3 | Phenel-skin | 5 | 19 | 10 | 30 | Pherate (Thimet)-skin | - | 0.05 | - | 0.2 | Phosgene (Carbony chloride) | 0.1 | 0.4 | - | - | Phosphine | 0.3 | 0.4 | 1 | 1 | Phosphorus (yellow) | - | 0.1 | - | 0.3 | Phosphorus pentachloride | - | 1 | - | 3 | Phosphorus Trichloride | 0.3 | 3 | - | - | Picric acid skin | - | 0.1 | - | 0.3 | Pyridine | 5 | 15 | 10 | 30 | silane (silicon tetrahydride) | 0.5 | 0.7 | 1 | 1.5 | Styrene, monomer (Phenylethylene) | 100 | 420 | 125 | 525 | Sulphur dioxide | 5 | 13 | - | - | Sulphuric acid | - | 1 | - | - | Toluene (toluel) skin | 100 | 375 | 150 | 560 | c.- Toludine | 5 | 22 | 10 | 44 | Tricheroethylene | 100 | 535 | 150 | 800 | Vinyl chloride | 5 | 10 | - | - | Walding fumes (NQC) | - | 5 | - | - | Xylene (o-m-p-isomers) skin | 100 | 435 | 150 | 655 | | | | | |
TABLE – 2 substance | Permissible time weighted average concentration | Silica | | (a) Crystalline | | (i) Quartz | | (1) In terms of | 1060 | dust count | %Quartz+10 mppcm. | | | (2) In terms of | 10 | respirable dust | % respirable quartz+2 mp/m3 | | | (3) In terms of | 30 | total dust | %Quartz+3 mp/m3 | | | (ii) Cristobalite ` | Half the limits given against quartz | (iii) Tridymite | Half the limits given against quartz. | (iv) Silica fused | Same limits as for quartz. | (v) Tripoli | Same limits as in formula in item 2 given against quartz. | (b) Amorphous | 705 mppcm. | silica to having less than 1% free silica by weight | | (a) Asbestos-Fibres longer than 5 microne | | (i) Amosite | 0.5 Fibre/cubic centimeter | (ii) Chrysetilc | 2 Fibres/centimeter | (iii) Crystobalite | 0.2 Fibres/cubic centimeter | (iv)other form | 2 Fibres/cubic centimeter | (b) Mica | 705 mppcm | (c) Mineral wool fibre | 10 mg/m3 | (d) Porlite | 1060 mppcm | (e) Portland | 1060 mppcm | (f) Soap stone | 785 mppcm | (g) Talc (notabeatiform) | 785 mppcm | (h) Talc (fibruous) | Same limits as for asbestos | (i) Tremelite | Same limits as for asbestos | Coal dust | | (1) For airborne dust having less than 5% silicon dioxide by weight | 2mg/m3 | (2) For airborne dust having over 5% silicon dioxide | Same limit as prescribed by formulas in item (2) against quartz | | |
TABLE-3 Substance | Permissible Limit of exposure | | Acetic anhydridie | 5 | 20 | D.- Dichlorobenzene | 50 | 300 | Formaldehyde | 2 | 3 | Hydrogen Chloride | 5 | 7 | Manganese & compounds (as Mn) | - | 5 | Nitroglycerin skin | 0.2 | 2 | Potassium hydroxide | - | 2 | Sodium hydroxide | - | 2 | 2,4,6 Trinitrotoluene (TNT) | - | 9.5 |
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