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N I OBRARA <br />FORMATION <br />(Upper Cretaceous) <br />1 <br />MEM <br />1!■IJtII• -• • <br />...:u.I t•,•,. - i' „I:I•':,.•,II•i_••I i':.:,1.. ,,.. <br />111 •. Ili•r :n t.yr • 1 ltd :: nl ... y. I.I. <br />MMIlffratitra=1 <br />CARLILE <br />SHALE <br />(Upper Cretaceous) <br />• Do KAANO) Qt ,_:' <br />1 i .r •. 1, .' - oil -n a I r °4 •1 <br />01'll.:le.•, 1• L,. ..I :.I •. <br />_ = = <br />___ _ <br />• , <br />•I I : .. d I n •.�.. , <br />GREENHORN <br />LIMESTONE <br />(Upper Cretaceous) <br />11 ' :l. 1:':.1 II ti • .uI I.I I:11.rr <br />„1 I• .1.• 1 <br />IlkJ MIN <br />INIIIIIIIIIM11111111111111111111 <br />l.Ih. l•rl' <br />I l :• 1•I r1.I'r <br />I II I ; l 11 I1 <br />! !!!1 <br />IIIiYIi�iSiliilY a i m <br />1 <br />1.1• vii l tl•. : :,• : 1. T2•1.1151r' •.1 11 1'1: <br />.I uen,,sI 11' <br />GRANEROS <br />SHALE <br />(Upper Cretaceous) <br />I•:. y'I.1 1. A . 1. 1 r. ■c'. i >,r i• •'lI1 I•• <br />lnr,'! I 1 '. : n • h u :rl . : 11041 I' .l ' P t11 ;'l tom'• rN <br />le .'.I• di 1:!rtea <br />'iI':•II' live; ;10:$ IIs I • <br />DAKOTA <br />p/� <br />SANDSTONE <br />(Leiner Cretaceous) <br />.y• -i •c - <br />: 1 ; - . , C 7 P . H E i r i * O . 1 4 A E . Y ; ' <br />• I9 ' .;h, :� ' % <br />I d'I ., 11. • u,: ' 1 1 I :., .w 1. _ <br />IL <br />\ • t I , : I : 1 1 1 , ' 1 1 t' IN . . 1 1 • .. • I , I, �, c l r I: <br />1. nil '1I '1” 1 1 I 1• <br />Y > <br />t 1 1 - t II,': t.I'l.: •y -1.1 ' II MI' t; i..t1.2 <br />_ ton 17ST0' F , , <br />Janice Lynn Bennett - 81422.PDF Page 17 <br />Blasting Impacts Assessment for the Proposed GCC Rio Grande, Inc Quarry in Pueblo County, Colorado <br />Chemical Contamination of Ground Water <br />Most commercial explosives contain 70 to 94% ammonium nitrate, by weight. If significant <br />amounts of explosives are spilled or incompletely detonated, some amount of ammonia and nitrate <br />can leach out into ground water. The U.S. EPA ambient water quality criterion is 0.02 mg /L free <br />ammonia and the drinking water criterion for nitrate as nitrogen (NO3 N) is 10 mg /L [NEED <br />C.F.R. CITE]. At the Red Rock site, if normal industry standards of care concerning clean -up <br />procedures are used to recover any spilled explosives materials like ANFO or emulsion slurry <br />explosives, and charges are adequately primed with cast - booster primers, ambient levels of <br />ammonia and nitrates in the relatively deep Dakota and Cheyenne aquifers, and the St. Charles <br />River located more than 4,000 feet from the closest blasting areas will not be subjected to any <br />significant increases in ambient levels of ammonia and nitrates. It should also be noted that <br />aquifers below the near - near - surface Hayes Limestone, where blasting will occur, as shown in <br />Figure 4.1, are isolated from the Dakota and Cheyenne aquifers by several impervious shale <br />layers. The author has visited many existing quarries with relatively arid environments, similar to <br />that of the Red Rock site, and knows of no significant water contamination incidents [ADD <br />LENGTH OF OPERATION IF KNOWN]. <br />Formation <br />1 REVEY Associates, Inc <br />Member <br />Noe I L' (:14. 11 ":•Y; Jn+ ph "ape; 1 - 99.I1,•ry t'.'5, <br />Thickness Depth to Bcticm <br />,R) ift) <br />Physical C,aracter <br />Page 14 <br />July 2002 <br />