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<br />' 10. Until the high cyanide levels in the ponds are brought dorvrr, all analyses for <br />cymride (all conrpnundsJ front down-gradient wells mrd swface venter should be <br />sent through on "Rush" status. Tunt-around should not exceed 10 days. /nobility <br />to meet this schedule should be described in rvriritrg by the irrdeperrderrt lab or <br />labs. <br />Other analyses may be setu routine. <br />' RESPONSE: It is BMR's understanding that both tolaf and WAD cyanide analyses will be done <br />on a "RUSH" status, while other parameters being analyzed for can be input to <br />the standard turnaround time at the analytical laboratory. This is acceptable to <br />' BMR. <br />11. Dr. David E. Hyatt's comrnetrls. <br />The comments and ctiticisnrs of Dr. Hyatt shordd be addressed along with drone <br />front the Division (see attaclrnretrtJ. <br />With respect, Dr. Hyart's comment Number 2 regarding use of the ion specific <br />' electrode technique shordd not be construed as nn. endorsement by the Division. <br />The ISE technique is no[ an EPA-recognized method ercept, perhaps, ns used in <br />carjrurction wi[h installation. TTre Division Iron receired cmuirntary infonnntiorr <br />' fionr bout the Colorado Depanrnerrt of Health and from Accu-Lobs regarding this <br />technique. Use of the ISEfor irr-house monitoring may 6e usefid, bat dre Division <br />will not accept data from this technique widrout verification of the resuhs using <br />' another EPA-accepted rtretlrod. <br />RESPONSE: BMR notes CMLRD comments on the use of the specific ion electrode. As noted <br />' above, there are no EPA-certified methods for free cyanide or WpD cyanide, brit <br />ISE have been used as an alternative finish to colorometric techniques for the total <br />cyanide manual method. <br />(Other responses to Dr. Hyatt's comments will follow in a subsequent section.) <br /> <br /> <br />' -6- <br />1 <br /> <br />