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1 <br /> r <br /> 4 <br /> IGOCM EMVIlCMIGI�rFAiTN.INC. <br /> ` P.O.Box 253 Morrison,Colorado 80465 Phone:(303)932-8484- Fax:(303)932-8585 <br /> i <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 Air <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. All 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(Um). 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 /> and 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 /> Anal ical Equipment. PCM <br /> PCM laboratory analysis was performed using a Nikon Alphaphot YS microscope or equivalent <br /> with a microscope field area of 0.00785 mm2 as defined by a Walton-Beckett graticule.Air 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 />