floating ball cover News

  • Los Angeles covers reservoir waters with ´shade balls´

    Los Angeles has been blackballed. The city has completed a program of covering open-air reservoirs with floating "shade balls" to protect water quality. City officials this week dumped the last 20,000 of 96 million black balls into the Los Angeles Reservoir in Sylmar, 25 miles northwest of downtown. The 4-inch-diameter plastic balls block sunlight from penetrating the 175-acre surface of ...

    By Associated Press

  • ASTM D490 - 92(2011) Standard Specification for Road Tar

    This specification covers 14 grades of road tar as follows: RT-1, RT-2, RT-3, RT-4, RT-5, RT-6, RT-7, RT-8, RT-9, RT-10, RT-11, RT-12, RT.C.B.-5, and RT.C.B.-6. The tar shall conform to the requirements prescribed for (1) water content, (2) specific gravity, (3) specific viscosity, (4) distillate content, (5) softening point of residue from ...

    By ASTM International

  • First flush diverters for improving rainwater quality

    A first flush diverter helps maintain your rainwater tank clean by removing debris, dust and any solid excretory product that accumulates on your roof as well as in your gutters around rainfalls to be expelled out at the very start of the water assemblage process. The more refined your rainwater is entering to your system, the less polluted your water will likely be when you utilize it. ...

    By Superwall Systems

  • ASTM D3666 - 11 Standard Specification for Minimum Requirements for Agencies Testing and Inspecting Road and Paving Materials

    This specification covers the minimum requirements for field and laboratory personnel, for establishing and maintaining a quality system, and establishes minimum qualifications for agencies engaged in the testing and inspection of road and paving materials. This specification can be used as a basis to evaluate testing or inspection agencies, or both, and ...

    By ASTM International

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