EPA 3005A Digestion Log — DIG-2026-0142
========================================
Date:       2026-06-15
Analyst:    mvasquez (Marie Vasquez)
Hot block:  DigiPREP 48, S/N DGP-02
Reagents:   HNO3 conc. (Lot 2026-A14), HCl conc. (Lot 2026-B22)
DI water:   Type I (Millipore, 18.2 MΩ·cm)

Time    Step                                              Verified by
-----   -----------------------------------------------   -----------
17:30   Aliquot 50.0 mL per vessel (7 vessels)            mvasquez
17:35   Add 5.0 mL HNO3 conc. (Lot 2026-A14)              mvasquez
17:40   Add 2.5 mL HCl conc. (Lot 2026-B22)               mvasquez
17:45   Start heating at 95 C on DGP-02                   mvasquez
18:00   Temperature check: 95.2 C (within +/- 2 C)        mvasquez
18:30   Temperature check: 94.8 C                         mvasquez
19:00   Temperature check: 95.1 C                         mvasquez
19:30   Temperature check: 95.0 C                         mvasquez
19:45   Hold complete (2 h 0 min)                         mvasquez
19:50   Cool to room temp, bring to 50.0 mL with DI       mvasquez
19:55   Filter through 0.45 um, transfer to ICP-MS vial   mvasquez
20:05   Send batch to ICP-MS queue (Run 20260616-01)      mvasquez

Vessels:
1  MB-0003           Method Blank
2  LCS-2026-0142     Lab Control Sample (500 ug/L spike)
3  LCSD-2026-0142    Lab Control Sample Duplicate
4  GW-0009           Sample
5  GW-0009-MS        Matrix Spike (500 ug/L Zn,Pb,Cd)
6  GW-0009-MSD       Matrix Spike Duplicate
7  GW-0010           Sample

Signed:   M. Vasquez                          Date: 2026-06-15 20:05
Reviewed: K. Patel (QA)                       Date: 2026-06-16 08:14

Audit trail SHA-256: 3a4f8e1c2b6d9a4e7c1f5e91b3a8c2d6e9f1a4b7c2d8e3a6f1b9c4d7e2f8a3c1b
