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Case Narrative Client: WSB & Associates, Inc Job ID: 310-229849-1 Project/Site: Kenzie Terrace Job ID: 310-229849-1 Laboratory: Eurofins Cedar Falls Narrative Job Narrative 310-229849-1 Comments No additional comments. Receipt The samples were received on 4/23/2022 10:30 AM. Unless otherwise noted below, the samples arrived in good condition, and where required, properly preserved and on ice. The temperatures of the 2 coolers at receipt time were 1.4º C and 2.2º C. GC/MS VOA Method 8260D: The following samples were collected in a properly preserved vial; however, the pH was outside the required criteria when verified by the laboratory. The samples were analyzed within the 7-day holding time specified for unpreserved samples: GW-1 (310-229849-1) and GW-4 (310-229849-2). Method 8260D: The continuing calibration verification (CCV) associated with batch 310-351296 recovered above the upper control limit for 2-Chlorotoluene(21.1%D), 1,2,3-Trichloropropane(29.4%D), cis-1,3-Dichloropropene(21.1%D), trans-1,3-Dichloropropene(20.2%D), 1,1,2,2-Tetrachloroethane(26.9%D), 1,3-Dichloropropane(23.3%D), 4-Chlorotoluene(20.5%D), 4-Methyl-2-pentanone(25.8%D), and 1,1,1,2-Tetrachloroethane(20.4%D). The samples associated with this CCV were non-detects for the affected analytes; therefore, the data have been reported. The associated sample is impacted: (CCV 310-351296/3). Method 8260D: The method blank for preparation batch 310-351186 contained 1,2,4-Trimethylbenzene above the reporting limit (RL). None of the samples associated with this method blank contained the target compound; therefore, re-extraction and/or re-analysis of samples were not performed. No additional analytical or quality issues were noted, other than those described above or in the Definitions/Glossary page. GC VOA Method WI-GRO: The following samples were collected in properly preserved vials; however, the pH was outside the required criteria when verified by the laboratory. The sample was analyzed within the 7-day holding time specified for unpreserved samples: GW-1 (310-229849-1). Method WI-GRO: The following sample was collected in a properly preserved vial; however, the pH was outside the required criteria when verified by the laboratory. The sample was analyzed outside the 7-day holding time specified for unpreserved samples but within the 14-day holding time specified for preserved samples: GW-4 (310-229849-2). Method WI-GRO: Significant peaks, readily distinguished from background, were detected in the following sample before the analytical window defined by the first component eluting in the Gasoline Range Organics (GRO) mix (i.e., Methyl tert-butyl ether): GW-4 (310-229849-2). Method WI-GRO: Significant peaks, readily distinguished from background, were detected in the following samples within five minutes after the end of the analytical window defined by the last component eluting in the Gasoline Range Organics (GRO) mix (i.e., Naphthalene): B-4 (10-12) (310-229849-9) and B-4 (14-16) (310-229849-10). No additional analytical or quality issues were noted, other than those described above or in the Definitions/Glossary page. GC Semi VOA No analytical or quality issues were noted, other than those described in the Definitions/Glossary page. Metals No analytical or quality issues were noted, other than those described in the Definitions/Glossary page. General Chemistry No analytical or quality issues were noted, other than those described in the Definitions/Glossary page. Eurofins Cedar Falls Page 3 of 90 5/17/2022 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15