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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 s <br /> • Before unloading the tanker truck, use a clean container to sa• <br /> obtain a small sample (about 2 cups). Protect our m <br /> • Measure the specific gravity or percent saturation using a roadside <br /> hydrometer or salimeter. vegetation. <br /> • Make sure you have the correct hydrometer for your mate- Chlorides can o <br /> rial. damage vegetation a <br /> • Salt brine should have a salimeter reading of 85% or a hy- at concentrations <br /> drometer reading of 1.176, which equates to 23.3% salt in greater than 70 <br /> the brine. ppm (about 1/3 <br /> • If the specific gravity is not within specifications, don't un- teaspoon of salt in <br /> load, and notify your supervisor. 5 gallons). <br /> 3 <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 g a <br /> dumped and observe if it is wet. a <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 lh cup to 1 cup of <br /> salt taken from the pile, away from the outer edge. <br /> • Microwave on high for 1 V2 minutes, stir and repeat. <br /> • Record the information on the worksheet on page 22 and <br /> calculate % moisture. a <br /> �o <br /> Id <br /> 21 °� <br /> ii <br /> 72 <br />