ARM 17.74.519. SAMPLING PROCEDURES

(1) All sampling procedures and laboratory analysis to verify the attainment of the decontamination standard for methamphetamine or fentanyl in ARM 17.74.505 must be conducted in accordance with the NIOSH 9111 method with the following exceptions: (a) methanol shall be the only solvent accepted for sampling; (b) samples shall not be composited; and (c) for fentanyl, standard analytical laboratory modifications to NIOSH 9111 are acceptable. (2) The department may approve an equivalent method, in advance, if the method is at least as stringent as the method in (1). (3) All samples identified in the department-approved assessment, work, or clearance plan shall be collected from within the inhabitable property. (4) All sample locations shall be photographed to indicate relative location. (5) All samples, field blanks, and media blanks shall be recorded on a chain of custody. (6) An assessment or clearance plan shall incorporate a sampling plan that follows an authoritative sampling approach, which uses professional judgment to target areas suspected to have contamination within the inhabitable property and unless otherwise approved by the department, shall include: (a) samples from each room or area within the inhabitable property reported to have contained a clandestine methamphetamine or fentanyl drug lab or has been exposed to contamination from consumption of methamphetamine or fentanyl; (b) at least one sample from each blower fan housing and heating, ventilation, and air conditioning (HVAC) system's return side when such systems are present in the inhabitable property; (c) at least one sample from each exhaust fan when exhaust fans are present in the inhabitable property; (d) for appliances intended to be salvaged, at least two samples must be collected from each appliance; and (e) a minimum of two discretionary samples, to be collected and utilized at the certified cleanup contractor’s discretion based on field observations. (7) An explanation of unexpected conditions and sampling plan deviations shall be submitted to the department in the final report.