Case Narrative — SDG CLE-2026-SDG-0142
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Laboratory:   Demo Environmental Laboratory
              Fictional laboratory record
              Example accreditation: DEMO-CERT-001

Client:       Demo Environmental Lab
              North lab, PA / South lab, WA

Project:      2026-Q2 Groundwater + South campus IH Air
SDG number:   CLE-2026-SDG-0142
Date issued:  2026-06-16

Samples received (2026-06-15):
  GW-0009   MW-01 Groundwater (North lab)
  GW-0010   MW-02 Groundwater (North lab) -- See note 1
  MB-0003   Method Blank
  AF-0005   Air filter (South Campus-01)
  AF-0006   Air filter (South Campus-02)

Analyses performed:
  EPA 6020B  ICP-MS metals panel (23 analytes), water samples
  NIOSH 7300 Metals on MCE air filters, air samples
  EPA 7470A  Mercury (Cold Vapor AA), water samples

Sample receipt:
  All samples received within holding times, properly preserved,
  receipt temperature 4.2 C (within 0-6 C range).

QC summary:
  Method Blank:        All analytes < MDL
  LCS recovery:        98.2% (limits 80-120%)
  MS / MSD recovery:   96.4% / 95.0% (limits 75-125%)
  RPD:                 1.4% (limit <20%)
  All QC within acceptance criteria.

Note 1 -- GW-0010 Zinc reanalysis:
  Initial analysis (injection #16, 10:24) reported counts
  exceeding the high calibration standard (62,485,200 cps).
  Sample was automatically queued for dilution reanalysis at
  x10 (injection #18, 11:24), bracketed by CCV-2 to confirm
  calibration stability. The dilution-corrected result
  (12,400 ug/L, flag D) supersedes the original (>5000 ug/L,
  flag E) per CLP SOM02.4 section 10.2. Both runs are
  preserved in the audit trail and reported in Stage 2+
  packages.

Anomalies, deviations, or corrective actions:
  None other than note 1 above.

Approved by:
  M. Vasquez (Analyst)         2026-06-16 14:30
  K. Patel (QA Manager)         2026-06-16 14:32
  Clearline Laboratory Director Signature: _______________
