Physical Characteristics Remarks in this column are for guidance only. (iii) A tradewaste with oil, fat or grease unavoidably emulsified, which in the opinion of the Council is biodegradable shall not exceed 500 g/mwhen the 3 emulsion is stable at a temperature of 15°C and when the emulsion is in contact with and diluted by a factor of 10 by raw sewage throughout the range pH 4.5 to pH 10.0. (iv) Emulsified oil, fat or grease shall not exceed 100 g/m 3 as petroleum ether extractable matter when the emulsion is unstable at a temperature of 15°C and when the emulsion is in contact with and diluted by a factor of 10 by raw sewage throughout the range pH 4.5 to pH 10.0. 5. Solvents and other Organic Liquids (i) There shall be no free layer (whether floating or settled) of solvents or organic liquids. 6. Emulsions of Paint, Adhesive, Rubber and Plastic For the purposes of this sub-clause Latex emulsion' means an emulsion containing paint, adhesive, rubber, plastic, or similar material. 'Treatable' in relation to emulsion wastewater, means the Total Organic Carbon content of the waste decreases by 90% or more when the wastewater is subjected to a simulated wastewater treatment process which matches the Council’s tre atment syste m. (i) Latex emulsions which are not treatable may be Latex emulsions vary considerably in discharged into the wastewater system subject to their properties and local treatment the total suspended solids not exceeding works may need additional restrictions 1000g/m 3 depending on the experience of the specific treatment plant and the quantity of latex to be treated. (ii) The Council may require pre-treatment of latex emulsions if the emulsion wastewater unreasonably interferes with the operation of the Council treatment plant. (iii) Latex emulsions of both treatable and non Latex emulsions will coagulate when treatable types, shall be discharged to the unstable and can sometimes cause wastewater system only at a concentration and sewer blockage. Latex emulsions are pH range that prevents coagulation and blockage stable when dilute or in the correct pH at the mixing zone in the wastewater system. range. 7. Radioactivity Refer National Laboratory Code of Safe Practice for the use of Unsealed Radioactivity levels shall not exceed National Radiation Radioactive Materials NRL.CI. Laboratory guidelines. 8. Colour Colour may cause aesthetic impairment of receiving waters and adverse effects No waste shall have colour or colouring substance that on lagoon treatment processes and causes the discharge to be coloured to the extent that it ultra-violet disinfection. Where impairs wastewater treatment processes or potential for such problem exists, a compromises the final effluent discharge consent. level of colour which is rendered not noticeable after 100 dilutions may be used as a guideline. Where UV disinfection is used special conditions may apply. Page 17