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TRAPPER MINING INC. <br />• SPILL PREVENTION CONTROL AND COUNTERMEASIIRE PLAN <br />To meet the requirements of Federal Regulation, Title 40, Protection of the Environment, Chapter 1 (Environmental <br />Protection Agency), Subchapter D (Water Program); Pari 112 (Oil Pollution Prevention), Trapper Mining Inc. <br />prepared a Spill Prevention Control and Countermeasure Plan in 1981. That SPCC plan has been modified in 1987, <br />1990, 1993, 1996, ]999 and again in 2002, to reflect the changes in the facilities at Trapper covered by these <br />regulations. <br />The following paragraph headings refer to [he guidelines set forth in Section 112,7 of the above-mentioned <br />regulations. <br />112.7 <br />(a) This facility experienced no reportable spill events during 3-year period preceding the March 2002 SPCC <br />Plan review/evaluation. ' <br />(b) The following table is an estimate of the predicted directions, rates of flow, and Iota] quantity of oils which <br />could be spilled from this facility as a result of a s urface tank failure, based on a one-hour interval to drain <br />the tank (see attached Map M57 for site locations; values based on largest single tank at each site): <br />SITE DIRECTION OF FLOW RATE OF FLOW TOTAL <br />] Southwest 333 gpm 20,000 gal <br />2 Southwest ],667 gpm 100,000 gal <br />3 South 250 gpm 15,000 gal <br />4 Southwest 42 gpm 2500 gal <br />• 5 <br />6 Southwest <br />Northeast 8.3 gpm <br />250 gpm 500 gal <br />15,000 gal <br />7 Northeast 167 gpm 10,000 gal <br />8 South 33 gpm 2000 gal <br />(c) All tank sites except #5, which is sufficiently small and of sufficient distance from the others to be exempt <br />from this plan, are surrounded with either compacted earthen dikes, or concrete containment walls, or aze <br />located upstream of a suitable impoundment designed to contain the entire volume of the largest single tank <br />with additional volume added [o allow for storm water. The banks of the dikes aze sloped to minimize <br />erosion. <br />Site #6 is a waste accumulation site. This site is a 70'x70'x8" concrete pad enclosed by a 12"x8" concrete <br />stem wall. A six-foot high chain-link fence surrounding the storage area controls access to [he site. Small <br />quantities of waste are stored in 55-gallon drums and include used gear oil, used grease, etc., and a 15,000- <br />gallon waste antifreeze tank. All containers are appropriately marked. <br />(d) Not applicable. <br />(e)(1)(i) Drainage from diked storage areas at Trapper is restrained by positive means to prevent spills and/or <br />excessive leakage of trapped materials. Normal storm water or snowmelt accumulations within earthen <br />dikes either evaporates or percolates. Should excessive water accumulate, portable pumps stored on the <br />property are used to drain the areas following inspection to insure run-oft' water complies with applicable <br />water quality standards. Records of all manual drainages are kept for at least three years. The record form <br />for all drainages from diked areas is shown as Attachment A. <br />(e)(1)(ii)Flapper-type drain valves are not used to drain diked areas. Diked areas are drained with portable pumps. <br />• (e)(I)(iii) To the extent possible, drainage from undiked oil storage facility areas flows into a pond and catchment <br />basin system designed to retain oil. These features are not located in areas subject to periodic flooding. <br />Rettisiorr: /+LpyA~ <br />4-18b <br />A~tOVd'-i: CA 4 Z17- <br />