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<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
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