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STATE OF <br /> COLORADO Scott -DNR, Eric <eric.scott@state.co.us> <br /> Climax pH measurements at GW#2 <br /> 1 message <br /> Lazuk, Raymond <rlazuk@fmi.com> Mon, Mar 13, 2017 at 3:37 PM <br /> To: "Scott - DNR, Eric" <eric.scott@state.co.us> <br /> Cc: "Hilshorst, Aaron" <ahilshor@fmi.com>, "Haag, James" <jhaag1@fmi.com>, "Kelts, Diana" <dkelts@fmi.com> <br /> Eric, <br /> On March 2, 2017 Climax called to verbally notify you that, during first quarter WQMP compliance monitoring, the field <br /> pH measurement of groundwater at POC well GW#2 was 6.45 standard units, which is just below the lower NPL limit of <br /> 6.5. As per the WQMP, we collected a confirmation measurement on March 8 that showed a pH of 6.47. In my phone <br /> conversation with today you indicated that the CBSG table values (and WQMP) lists pH limits to one decimal place (6.5 <br /> —8.5) and that Climax can round pH values to one decimal place, as appropriate, for compliance and reporting <br /> purposes. Therefore, the confirmation measurement is within the NPL range at 6.5 and Climax remains in compliance. <br /> We have seen wide variability with pH at GW#2 in the past, with occasional values below 6.5. As we discussed today, <br /> we intend to increase the monitoring frequency for pH measurements to monthly until such time that the pH levels rise to <br /> historical averages. If pH levels do not rise to within historical averages we will contact you to discuss any needed <br /> follow-up actions. <br /> Please feel free to contact me if you have any questions. Thank you for your continued assistance with Climax. <br /> - Ray <br /> Raymond Lazuk <br /> Environmental Manager <br /> Climax Molybdenum Company <br /> Climax Mine <br /> HWY 91 -Fremont Pass <br /> Climax, CO 80429 <br /> Office: 719-486-7584 <br /> Cell: 719-201-1282 <br /> rlazuk(@fmi.com <br />