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Titration pH 8.5 9.0 <br />pH after 24 hrs. 8.05 8.24 <br />E/C mmhos/cm 3.90 3.77 <br />Dissolved Solids mg/1 2780 2715 <br />Suspended Solids mg/1 < 10 < 10 <br />Recoverable Iron mg/l 1.54 0.63 <br />Recoverable Cadmium mg/l 0.0007 0.0007 <br />Oil and Grease mg/i < 5.0 < 5.0 <br />• It was apparent from these tests that the water could be treated <br />by increasing its pH to allow the iron to settle out. A drip <br />feed system has been installed to accomplish this. The drip feed <br />system is using a 25% solution of sodium hydroxide as a buffer <br />feeding at about 3 ounces per minute into the 30 gallon per <br />minute stream. <br />Two treatment ponds were constructed on site, each with a surface <br />area of approximately 5,000 square feet. The ponds are both ap- <br />proximately five feet deep, and have a combined total capacity of <br />about 175,000 gallons. At a flow rate of 30 gallons per minute, <br />43,200 gallons per day, the ponds have a four day detention time. <br />4-66f Revised 6-12-89 <br />Te0c, <br />increased with <br />sodium hydroxide and then <br />the sample was allowed <br />to settle for <br />24 hours. Results of <br />the analysis of the water <br />samples after a <br />24 hour settling period <br />are as follows: <br />Titration pH 8.5 9.0 <br />pH after 24 hrs. 8.05 8.24 <br />E/C mmhos/cm 3.90 3.77 <br />Dissolved Solids mg/1 2780 2715 <br />Suspended Solids mg/1 < 10 < 10 <br />Recoverable Iron mg/l 1.54 0.63 <br />Recoverable Cadmium mg/l 0.0007 0.0007 <br />Oil and Grease mg/i < 5.0 < 5.0 <br />• It was apparent from these tests that the water could be treated <br />by increasing its pH to allow the iron to settle out. A drip <br />feed system has been installed to accomplish this. The drip feed <br />system is using a 25% solution of sodium hydroxide as a buffer <br />feeding at about 3 ounces per minute into the 30 gallon per <br />minute stream. <br />Two treatment ponds were constructed on site, each with a surface <br />area of approximately 5,000 square feet. The ponds are both ap- <br />proximately five feet deep, and have a combined total capacity of <br />about 175,000 gallons. At a flow rate of 30 gallons per minute, <br />43,200 gallons per day, the ponds have a four day detention time. <br />4-66f Revised 6-12-89 <br />Te0c, <br />