| (a) The operator of an environmental testing laboratory applying for initial accreditation shall ensure that two proficiency test samples are successfully analyzed, if available, according to the standards for accreditation as specified in §25.9 of this title (relating to Standards for Environmental Testing Laboratory Accreditation), for each requested field of accreditation and reported to the executive director. (b) The operator of an accredited environmental testing laboratory shall ensure at least two proficiency test samples, if available, are successfully analyzed and reported to the executive director each year for each field of accreditation according to the standards for accreditation as specified in §25.9 of this title. An environmental testing laboratory that does not meet the requirements of this subsection may participate in a supplemental proficiency test study according to the standards for accreditation. (c) Proficiency test samples, if available, shall be purchased from a National Environmental Laboratory Accreditation Program designated provider. |
