041-2 Wyo. Code R. § 2-10
(a) Laboratories providing analyses required by this regulation shall have a written Quality Assurance (QA)/Quality Control (QC) program. A written summary shall be included in project reports. The minimum components of the laboratory QA/QC program shall include matrix blanks, matrix duplicates, and matrix spikes.
(b) Each batch of samples submitted to the lab by the ESP shall include, at a minimum, unknown spiked samples, field blanks, and field duplicates (side-by-side) at a frequency of 10% of total samples for each type. Unknown spiked samples and field blanks shall be made using the same media as used for sampling, in identical sample containers so that no features of the spiked or blank samples can be distinguished from field samples. Unknown spiked samples shall contain an amount of target compound between 10% and 1000% of the AL. The amount shall be known only to the ESP. Field blanks shall be prepared in the assessment structure in the same manner as field samples without contacting the media to any surface. The field QC samples shall be kept confidential from the lab by either reporting no area for any sample or reporting a standard area for QC samples.
(c) Batch QC fails if matrix spikes exceed +/- 20% of the performance limit or any detectable target compound is found on lab blanks, if field blanks contain more than 10% of the AL, or if unknown spiked samples deviate from known amounts by more than 30%. If batch QC fails, the zone(s) of assessment represented by the data batch shall be assumed to be non-compliant or shall be re-sampled.
041-2 Wyo. Code R. § 2-10