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1 <br />j� <br />bottom of the tank, this will allow carbon dioxide to bubble up through the water <br />and diffuse more evenly. <br />7. Slowly discharge the water making sure water does not get stirred up in the pro- <br />cess. Release about 80% of the water from the structure leaving any sludge <br />behind. <br />8. Discharge treated water through a pond or drainage system. <br />9. Excess sludge needs to be disposed of properly as concrete waste. If several <br />batches of water are undergoing pH treatment, sludge can be left in treatment struc- <br />ture for the next batch treatment. Dispose of sludge when it fills 50% of tank <br />volume. <br />Sites that must implement flow control for the developed site must also control storm - <br />water release rates during construction. All treated stormwater must go through a flow <br />control facility before being released to surface waters which require flow control. <br />Maintenance Standards <br />Safety and Materials Handling: <br />. All equipment should be handled in accordance with OSHA rules and regulations. <br />Follow manufacturer guidelines for materials handling. <br />Operator Records: <br />Each operator should provide: <br />. A diagram of the monitoring and treatment equipment. <br />. A description of the pumping rates and capacity the treatment equipment is cap- <br />able of treating. <br />Each operator should keep a written record of the following: <br />• Client name and phone number. <br />• Date of treatment. <br />. Weather conditions. <br />. Project name and location. <br />. Volume of water treated. <br />. pH of untreated water. <br />. Amount of CO2 needed to adjust water to a pH range of 6.9-7.1. <br />. pH of treated water. <br />• Discharge point location and description. <br />2014 Stormwater Management Manual for Westem Washington <br />Volume 11 - Chapter 4 - Page 411 <br />