04_AECOM_Environmental Report_Final

Job Narrative 140-37968-1 Receipt The samples were received on 8/7/2024 4:40 PM. Unless otherwise noted below, the samples arrived in good condition, and where required, properly preserved and on ice. The temperature of the cooler at receipt was 20.2° C. General Chemistry Total Particulates: The measurement of the mass of particulate matter trapped by the particulate filter and probe rinse derived from an M-5 sampling train was performed using SOP number KNOX-WC-0005 (based on EPA Methods 0050 and 5). Microfiber filters and 150 mL beakers are carefully inspected and tare weighed to constant weight. After sample collection, the filters are dried, and then carefully weighed to constant weight ta determine the mass of particulate matter trapped on the filters. The acetone probe rinse solution is evaporated to dryness, and then weighed to constant weight to determine the total particulate mass collected in the rinse. The total particulate mass collected by an M-5 train is the sum of the particulate filter and the acetone probe rinse residue weights. Particulate by Method 202 (December 2010): Samples derived from Method 202 require special handling. The CPE filters were extracted three times with water, which was then combined with the corresponding aqueous fraction. The filters were then extracted with hexane three times, and the extracts were combined with the solvent rinses. The aqueous fractions were then extracted three times with hexane, and the extracts were combined with the solvent rinses. The organic fractions, including the acetone and hexane reagent blanks, were air dried in a heed. The aqueous fractions, including the deionized water reagent blank, were simmered to near dryness, and then allowed ta air dry. Aqueous samples having a pH < 5 were reconstituted with bailed deionized water, and then titrated with 0.1N ammonium hydroxide to a pH 7 endpoint if the reconstituted sample had a pH <5. The titrated samples were again simmered to near dryness, and then allowed to air dry. Titration to a pH 7 endpoint was not required for samples with a pH of 6 or higher upon receipt or after the sample was reconstituted. Where applicable, the contribution from added ammonia was caleulated and subtracted from the residue weight to obtain the final result for the aqueous fractions. Residual water from both the aqueous samples and the organic solvent samples

added ammonia was caleulated and subtracted from the residue weight to obtain the final result for the aqueous fractions. Residual water from both the aqueous samples and the organic solvent samples were further air dried in a forced draft oven at 28°C before transferring them to a desiccator. The air dried samples were transferred to a desiccator and dried over calcium sulfate te constant weight. No additional analytical or quality issues were noted, other than those described above or in the Definitions/Glossary page. Page 7 of 88 8/21/2024 12:21:54 PM