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23 May 2023 Project No. 14-3154 Page 3 of 7 AdvancedGeo An Employee- Owned Company 7822DT direct -push drilling rig equipped with 1.85 -inch diameter hollow probing rods advanced inside 3.25 -inch diameter outer casing. The Geoprobe advances soil probe borings using a hydraulic hammer to drive sampling tools to specified depths. Borings were advanced in a grid -like pattern comprising approximately 2,400 square feet surrounding T-29. Borings were advanced east to west evenly spaced approximately 15 feet apart and north to south evenly spaced approximately 20 feet apart. Boring locations are illustrated in Figure 3. 3.1. SOIL SAMPLE COLLECTION AND ANALYSES Soil samples were collected continuously from surface grade to total depth in all borings using a 1.85 -inch diameter Geoprobe soil sampling assembly loaded with five-foot long acetate sleeves. After collection, the acetate sleeve was cut open to expose the entire soil core to classify the soil and inspect the core for waste. The soil was visually classified in accordance with the Unified Soil Classification System (USCS). Additionally, soil samples were field -screened for the presence of organic vapors using an organic vapor meter (OVM), equipped with a photo -ionization detector (PID). PID readings and soil classifications were recorded on boring logs, provided in Appendix E. The initial scope of work proposed to analyze soil samples collected beneath waste. During the investigation, pieces of trace glass cullet were observed in most borings at approximately 3 feet bsg. AGI does not consider the pieces of trace glass cullet to be waste glass. The glass comprising the waste cells and disposal areas identified to the south and west (17100 and 17200 Murphy Parkway) of the site is not consistent with the pieces of trace glass cullet observed during this investigation. The pieces of trace glass cullet observed during this investigation were more consistent with surficial glass encountered at the property that was historically gathered and stored on concrete pads north of the railway pending recycling. Furthermore, only pieces of trace glass cullet at shallow depths were encountered in the T29 area during the investigation. The waste pits encountered to the south of the railway, and since remediated, contained large shards of broken glass. The pieces of trace glass cullet encountered in the T29 area were entirely different. Buried waste was not encountered in the T29 area. Even though waste glass was not observed, soil samples were collected beneath the pieces of trace glass cullet at the direction of CalRecycle and EHD staff onsite observing the work. Except for borings T29136 and T29B15, small pieces of trace glass cullet were observed in each boring between 3 and 4 feet bsg. Therefore, soil samples were collected in each boring except for T29136 and T29131 where no glass was present. Borings T29B1 and T29B2 had been completed to 10 feet bsg and T29B3 was completed to 5 feet bsg before CalRecycle and EHD requested soil sampling. Consequently, borings T29131 and T29132 were advanced to 11 feet bsg for soil sample collection and a soil sample was collected at 6 feet bsg from T29B3. All other soil samples were collected at