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around the mine and adequate records of the event maintained. If the water is <br />not within acceptable limits, the Nenager of Environmental Engineering should be <br />• contacted to provide for the tlispasal of the containment material at an EPA <br />approved disposal site. <br />(2) All bulk storage tank installations will be constructed so [hat a secondary <br />means of containment is provided for the entire contents of the Largest single <br />tank, if appropriate, plus sufficient freeboard. Diked areas will be <br />sufficiently impervious to contain the spilled substance. Dikes, containment <br />curbs, and pits are commonly employed for this purpose, but [hey may no[ always <br />be appropriate. An alternative system would include a complete drainage trench <br />enclosure arranged such that a spill could terminate end be safely confined in a <br />catchment basin, holding pond, or sediment pond. <br /> Aboveground tanks will be subject to periodic integrity testing, taking into <br /> account tank design (floating roof, etc.) and using such technique s as <br /> hydrostatic testing, visual inspection or a system of non-destructive shell <br /> thickness testing. Comparison records will be kept where appropriate, and tank <br />• supports and foundations included in these <br />outsid <br />rved <br />f [h <br />t <br />k <br />ill b <br />f <br />tl <br />b inspections. In addition, <br />e <br />sonnel for <br />b <br />er <br />ti the <br />si <br />ns <br /> e o <br />an <br />w <br />requen <br />y o <br />se <br />e <br />e y op <br />a <br />ng p <br />r g <br /> of deterioration, leaks which might cause a spi ll, or accumulation inside diked <br /> areas. <br />Visible leeks which result in losses from tank seams, gaskets, rivets and bolts <br />sufficiently large to cause accumulations in diked areas will be promptly <br />corrected upon detection. The Safety Department will help control and identity <br />spills and leaks. <br />Mobile or portable storage tanks will be positioned er located so as co prevent <br />spillage from reaching water courses. A secondary means of containment, such as <br />dikes, sorbent booms, or catchment basins, should be furnished for the largest <br />single compartment or tank, if appropriate. These facilities will be located <br />where they will no[ be subject to periodic flooding or wash-out. <br />Neu buried installations which have 70 percent or more of their volume including <br />• APPROVED APR 0 a t996 <br />7-6h-5 Revised 03!29/96 <br />