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Geospte& consultants As an example, a soil sample collected on October 1, 2024, from location 817B-08 at a depth of 2 feet bgs will have an ID of 817B-08-SS-2-20241001. Monitoring well samples well be formatted as only"Well ID-Date". 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 groundwater samples will be stored in an ice-cooled chest and maintained at approximately 0 to 6 degrees Celsius (°C). Soil vapor samples will be stored at room temperature. Samples will be transported under standard chain-of-custody procedures (described below) to a California-certified laboratory. 4.2.6.2 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. 4.2.6.3 Sample Analysis Table 1 outlines the soil, groundwater, and soil vapor samples to be collected and analytical testing to be performed. A total of 33 soil samples, 5 grab groundwater samples, and 11 soil vapor samples are planned to be collected. Samples will be submitted a California-certified analytical laboratory for the following analysis (Table 1 and 2). • Soil samples will be analyzed for VOCs (including methyl tert-butyl ether [MTBE]) and TPH-g using USEPA Method 8260B, and TPH-d using USEPA Method 8015B. Investigation Work Plan—UST 817B 11 December 2024