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Secondary Containment Assessment <br />The secondary containment calculations provided for on this page are for secondary containment <br />systems that utilize a double walled tank for containment. <br />ConVault tank is double -walled. No additional secondary containment is <br />required. <br />Design of tank: <br />The tank is welded 10-guage steel encased in geomembrane and concrete and <br />rests on concrete support legs. The tank exterior is insulated with a minimum of <br />1/4" thick styrofoam covered (wrapped) by a 30 -mil high density polyethylene <br />geomembrane which provides secondary containment. The tank includes an <br />integrated leak detection tube that allows monitoring for leaks from the primary <br />tank into the secondary containment. The leak detection chamber is checked as <br />part of routine monitoring and maintenance. <br />The geomembrane is covered by 6 inches of concrete reinforced with'/2-inch <br />rebar to provide two-hour fire protection, ballistic, and vehicle impact protection. <br />The 30 -mil high density polyethylene membrane also prevents external <br />corrosion. The piping between the sump table and pump is equipped with a <br />water separator to trap any water in the waste oil. Water that may still <br />accumulate in the tank is removed with the oil when the tank contents are <br />collected for recycling approximately every two weeks. The separator and <br />frequent recycling process minimizes internal tank corrosion. <br />Visual inspection of containment area: <br />Provide a brief description of the condition of the tank. The tank system has spill <br />control. The tank is filled using attached piping from the sump table. The tank is <br />fitted with a level gauge that is monitored visually to prevent overfilling. The tank <br />and sump table are maintained within an area surrounded by a 4 -inch -high <br />concrete curb and covered by a roof structure. There are no drains within the <br />curbed area. <br />Secondary Containment findings: The secondary containment system is of <br />sufficient capacity and condition for the containment of releases from all tanks <br />and ancillary equipment. Initials: A4W <br />engineering -environmental Management, Inc. (HDR I e2M) 1,000 Gal. Waste Oil Tank <br />