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DLR4Y SILVER MINES <br /> 4.2.1 Construction (40 CFR 112.8(c)(1)) <br /> All hydrocarbon and reagent tanks at this facility are constructed of steel in accordance with <br /> industry specifications. The design and construction of all bulk storage containers are <br /> compatible with the characteristics of the product they contain and with pressure and <br /> temperature conditions. <br /> 4.2.2 Secondary Containment (40 CFR 112.8(c)(2)) <br /> Secondary containments provide at least 110% of tank capacity. These containments must be <br /> maintained in good condition and evaluated monthly as recorded by the monthly inspections. <br /> 4.2.3 Drainage of Diked Areas (40 CFR 112.8(c)(3)) <br /> The two main mill tunnels are graded to drain to a central sump, so that any chemical spill that <br /> could possibly occur would never enter the mine water discharge and consequently,the site <br /> discharge. This central sump has a capacity of 3000 gallons, which is far more than any of the <br /> chemical tanks that will be stored in the mill area. The sump is pumped back to the process <br /> water tanks for reuse under the direct supervision of site personnel. Any accumulated water is <br /> observed for sign of oil prior to pumping. In the case of small quantities of liquid absorbents can <br /> be used. <br /> Any contaminated water must be disposed of in an approved manner as discussed in Part 5 of <br /> this Plan. Contaminated water must be pumped into a labeled container with a securely fitted <br /> lid and removed by a licensed disposal company or returned to process water tanks. There is no <br /> discharge to the environment. <br /> A log of contaminated water pumping will be maintained by the Environmental Department <br /> and filed in a central location. <br /> 4.2.4 Corrosion Protection (40 CFR 112.8(c)(4)) <br /> No underground hydrocarbon storage tanks are present on site and all above ground tanks are <br /> elevated,therefore no cathodic protection is required. <br /> 4.2.5 Partially Buried and Bunkered Storage Tanks (40 CFR 112.8(c)(5)) <br /> This section is not applicable as there are no partially buried or bunkered storage present on <br /> site. <br /> Spill Prevention Control and Countermeasure Plan 22 1 P a g e <br />