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twiramismouHVM ham <br />P.O. Box 253 • Morrison, Colorado 80465 • Phone: (303) 932-8484 • Fax: (303) 932-8585 <br />August 21, 2014 <br />Mr. Brian McGill <br />Freeport — McMoRan <br />Climax Mine, Hwy 91— Fremont Pass <br />Climax, CO 80429 <br />RE: Final Clearance Air Monitoring, Asbestos Abatement Support <br />Climax Mine, CAVR Housing <br />Dear Mr. McGill, <br />Koch Environmental Health, Inc. (KEH) conducted final clearance air sampling and analysis via <br />Phase Contrast Microscopy (PCM) for Freeport — McMoRan (the customer) on August 19, 2014. <br />KEH professional services were provided in support of decontamination of potential asbestos <br />dust or debris from the CAVR Housing at the Climax Mine in Climax, Colorado. Samples were <br />collected by KEH representative Thomas D. Koch. CIH, a Department EPA -certified Asbestos Mr <br />Monitoring Specialist (AMS). Copies of professional certifications are available upon request. <br />Decontamination of the CAVR housing structure was conducted by LVi Environmental Services. <br />Scope of Work <br />KEH's scope of work for this project included performing surveillance for asbestos regulatory <br />compliance daily oversight and visual inspections; and collection and analysis of background air <br />samples via PCM (Phase Contrast Microscopy) by a State of Colorado certified Air Monitoring <br />Specialist (AMS). Air monitoring services were performed in accordance with applicable EPA <br />requirements. <br />Sample Collection <br />Phase Contrast Microscopy (PCM) samples were collected on 25 -millimeter (mm) mixed - <br />cellulose ester membrane filters, 0.8 -micron pore size, with an effective collection area of 385 <br />mm2. Al filters were pre assembled by the manufacturer in three -stage, conductive sampling <br />cassettes with extension cowls. <br />Air samples were collected at flow rates between 1.0 and 10.0 liters per minute (Urn). KEH <br />Representatives used professional judgment and expertise In determining sample flow rates and <br />locations based upon project conditions. Flow rates were recorded at the beginning and at the <br />end of the sampling period utilizing an airflow rotameter calibrated against a primary flow <br />calibration instrument. Start times and stop times were recorded for all sampling periods. <br />Analytical Eauipment. QCM <br />PCM laboratory analysis was performed using a Nikon Aiphaphot YS microscope or equivalent <br />with a microscope field area of 0.00785 mm2 as defined by a Walton -Beckett graticule. Mr sample <br />analysis was performed by an American Industrial Hygiene Association -accredited laboratory for <br />target analyses. <br />Clearance Samples <br />Clearance samples were collected after an acceptable status visual inspection had been <br />performed by a qualified AMS in each applicable work area. Results of all final clearance <br />samples contained in this report were below the CDPHE clearance guideline of 0.01 fiber/cubic <br />centimeter (f/cc) for PCM analysis. <br />