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• <br />• <br />TRAPPER MINING INC. <br />SPILL PREVENTION CONTROL AND COUNTERMEASURE PLAN <br />To meet the requirements of Federal Regulation, Title 40, Protection of [he Environment, Chapter 1 (Environmental <br />Protection Agency), Subchapter D (Water Program); Part 112 (Oil Pollution Prevention), Trapper Mining Inc. <br />prepared a Spill Prevention Control and Countermeasure Plan in 1981. That SPCC plan has been modified N 1987, <br />1990, 1993, ] 996, and again in 1999, to reflect the changes in the facilities at Trapper covered by these regulations. <br />The following paragraph headings refer to the 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 yeaz period preceding the March 1999 SPCC <br />Plan review/evaluation. <br />(b) The following table is an estimate of the predicted directions, rates of flow, and total quantity of oils which <br />could be spilled from tlds facility as a result of a surface tank failure, based on a one-hour interval to drain <br />the tank (see attached Map M57 for site logtions; 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 />Southwest 1,667 gpm ]00,000 gal <br />South 250 gpm 15,000 gal <br />Southwest 42 gpm 2500 gal <br />Southwest 8.3 gpm 500 gal <br />Northeast 250 gpm 15,000 gal <br />Northeast 167 gpm 10,000 gal <br />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, aze surrounded with either compacted earthen dikes, or concrete containment walls, or are <br />located upstream of a suitable impoundment designed to contain the entire volume of the largest single tank <br />with additional volume added to allow for storm water. The banks of the dikes aze sloped to minimize <br />erosion. <br />Site H6 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 the site. Small <br />quantities of waste are stored in 55-gallon dorms and include waste gear oil, waste grease, etc., and a 15,000- <br />gallon waste antifreeze tank. All containers are appropriately marked. <br />(e)(1) Normal storm water or snowmelt accumulation within the earthen dikes or concrete impoundments either <br />evaporates or percolates. Should excessive water accumulate, portable pumps stored on the property would <br />be used to drain the areas following inspection to insure ronoff water complies with applicable water quality <br />standards. Records of all drainages will be kept at least three years. The record form for all drainages from <br />diked areas is shown as Attachment A. <br />(e)(2)(i) The construction of and material used in all storage tanks at the facility are compatible with the material <br />stored in them. <br />(e)(2)(ii)All non-buried tanks with volumes greater than 660 gallons are enclosed with earthen dikes, or other suitable <br />. containments, sufficiently impermeable or adequately engineered to prevent oil from reaching navigable <br />waters. The shop/warehouse (Site 4) and Lube Bay (Site 8) storage areas have provisions for drainage to an <br />appropriately designed and engineered pond. In the event of a spill, the oil is routed into a lagoon containing <br />4-18b Revision: i~.,4-/7/ <br />Approved:llAY ~,g99 <br />