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• <br />• <br />• <br />Materials and Quality Control <br />MATERIALS TESTING <br />Test your materials to ensure that they are delivered as ordered <br />and will perform as needed. Refer to your contract or Material <br />Safety Data Sheet (MSDS) for specific gravity. <br />Testing liquids <br />• Before unloading the tanker truck, use a clean container to <br />obtain a small sample (about 2 cups). <br />• Measure the specific gravity or percent saturation using a <br />hydrometer or salimeter. <br />• Make sure you have the correct hydrometer for your mate- <br />rial. <br />• Salt brine should have a salimeter reading of 85% or a hy- <br />drometer reading of 1.176, which equates to 23.3% salt in <br />the brine. <br />• If the specific gravity is not within specifications, don't un- <br />load, and notify your supervisor. <br />Testing sand <br />• Conduct a visual inspection of the material to make sure it <br />is clean. <br />• Note that each user has its own specifications based on <br />available materials. <br />Testing solid salt <br />• Make sure someone is present to watch the load being <br />dumped and observe if it is wet. <br />• Test salt for moisture content. You are looking for a mois- <br />ture content of less than or equal to 1.6 %. (Check your <br />agency's specification.) <br />How to measure the moisture content of rock salt: <br />• Get your supplies: an accurate scale and 1/2 cup to 1 cup of <br />salt taken from the pile, away from the outer edge. <br />• Microwave on high for 1 1h minutes, stir and repeat. <br />• Record the information on the worksheet on page 22 and <br />calculate % moisture. <br />21 <br />sA <br />Protect our <br />roadside <br />vegetation. <br />Chlorides can <br />damage vegetation <br />at concentrations <br />greater than 70 <br />ppm (about 1/3 <br />teaspoon of salt in <br />5 gallons). <br />