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r~ (fold Hill Mill Adequacy Review Responses May 31, 1995 8. All chemicals will be stored within the mill building so that apU4 can be oontairiod. No moue than 12 empty ehemicel deans will be stored on site at any evert time. 9. A phut vizw aCUtz uu'0 bwldutg is itu:lttded fo show ett possible exit poittta far !laid err shtay apa'fla. Afl wash down water from the upper levels currently flows down fo the knver laud whoa the tlticlosier is located There are three exit poirtts on the borer laud that wiG have to be modified m aanhin a 'reasonably foreseeable sprIl^. A rolhrp overhead door am the rtaathast side of the lower laud wig leave to have the foundation continued across the bottom ofthe door. On the eestaidS atnan doaJ.wr'D Lave to have the foundation oordntxd across the etttrarice std the door Game moved up to the top of the foundation wa1L Steps wrb Lave to be provided ir~de and outside of the butldutg to provide nfe access through the door. An access belch on the seat aide of the buflding tluocrgh the Gendalion waQ into a sump cutout for the thirJrater will have to be sealed. The top of the foundation wafl Gom the firtished floor slab m the lower levdx Ill iriolua. Toles interior floor area of the lower laud is 67.8 feet by 47.5 beet Total storage capecrty witLm the ibundation walls is 35,900 gallon,. We do riot believe that a complete tank ngrhue of the Ihicloerxl (75,111111 gallon capaaty) would be the mast'Yeaaonably foreseeabk spill.. event The swat tikdy everda world be a phtgged line causing en overflow or a broken line that might spi'fl a portion of the tank vohtme befaue repeus could be made. During a spiIl, the floor drauta would dtaut pert of a e~ to the tar3rtgi pond. We believe tbet with Utz modificetiate to the fourulefion walls at the doss, adequate aspacdy is available for a spill situation 10. The dn~ersion ditches above the present teilutgs pond are shown on Exhibit E-1 that is attached. The ditch reaches and size, ere displayed on a teblz on the map. The cuaent ditches are large enough to carry the peak flow during a 100-year, 2d-hour desist stomr. The drainage ems above the expanded tares' tgs pond that wDl dttt6t into the tatlhtgs pond is loo smaIl to justify ally diversion ditcttzs Cor tuutisturbed dreirtage. All disturbed area dreituge wifl flow into the mdrrtgs pond. The sable shown in Item 23 of otu previous respome rhadd be becawe the ditches described are no longer being proposed 11. A low pyritic "graded rock cover" will be excavated from the txtaow area end stockpiled above the borrow area for used during reclarnetion. The borrow gttant8y wtIl be suHiamt b cover the tailntgs area with 24 inches of material. The bond wiIl re&d the 6t11 cost of excavation . hattting, damping and spreading the rock coves. It is our undersmndirtg flat the bond wtIl be seduced by the excavation coat witzn the graded rock stackptle is in place. The cast of geotexttk wrlf be added to the baud. 12. The watu laud behud the Hazel A btrlldtead ~ be checked and recorded dally when the Gee water surface m the pond is high enough to overtop tlrc decant slatdpipes. TLe fiuy of the decant risers will be petfomted monthly and recorded. The mmuloring observations for ell itans listed in Itzm 26 of our previous adequacy review resparuea u well as the frequency listed above and in item 13 blow wig be kept in a log a< the still office that a available to the Division upon tegtrest. 13. '[I>z i.urulruction dzscyiplion lettzr by Mr. Mark Steen, dated July 16,1987, is attached. The previous adequacy response sorted that water for the mill was pumped Gom the Wynauu mine shag. Oru date for the response was inecttuate. After a site survry, we have detemtated that water for Wz will is ptunpzd from a lwrzholz located west std across the roars from the Trull buiWirtg. The borehole extends into the'1'ime mine and is pumped to the mill by a submaebk: pump kxxited yr the borehole. The water is pumped through a 2-etch line that is Mated moat of the way m the mill