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Geospte& consultants As an example, a soil sample collected on August 18, 2022, from location SS-81713-06A at a depth of 2 feet bgs will have an ID of PS-UST-SS-817-06A-2-20220818. Each sample will have an adhesive plastic or waterproof paper label affixed to the container. Samples will be labeled at the time of collection, and the following information will be recorded on the container label: • Project name. • Sample identification. • Date and time of sample collection. • Preservative type (if applicable). Soil and grab groundwater samples will be stored in an ice-cooled chest and maintained at approximately 0 to 6 degrees Celsius (°C) for transport under standard chain-of-custody procedures (described below) to Eurofins Environment Testing Northern California, LLC, a California-certified laboratory. If collected, the LNAPL samples will be stored in an ice-cooled chest and maintained at approximately 0 to 6°C for transport under standard chain-of-custody procedures (described below) to Eurofins Environment Testing Northern California, LLC, a California-certified laboratory. 3.2.2.2 Chain-of-Custody Procedures Standard chain-of-custody (COC)procedures will be followed for the samples throughout the collection, handling, and analysis process. Samples are considered to be in one's custody if within the custodian's possession or view, in a secured location with restricted access, or in a container that is secured with an official seal such that the sample cannot be accessed without breaking the seal. The principal document used to track possession and transfer of samples will be the COC form. Each sample will be entered on a COC form the day it is collected. The data entries will be made using an indelible-ink pen. Corrections will be made by drawing a single line through the error, writing in the correct information, then dating and initialing the change. A COC form will accompany each cooler of samples to the analytical laboratory. Each person who has custody of the samples will sign the COC form and ensure that the samples are not left unattended unless properly secured. Copies of the COC forms will be retained in the project files and included in the final report. 3.2.2.3 Sample Analysis A total of six soil and three grab groundwater samples (two primary samples and one duplicate sample)will be submitted to the analytical laboratory. The samples will be analyzed for VOCs and TPH-g using USEPA Method 8260B, TPH-d using USEPA Method 8015B, and TOC using USEPA Method 9060A (soil) or SM 531 OD (water). If collected, the LNAPL samples will be analyzed for TPH-g using USEPA Method 8260B and TPH-d using USEPA Method 8015B. Analytical methods and expected reporting limits for the chemicals are included in Table 3. The Final Investigation Work Plan Addendum—UST 817B 7 June 24,2022