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(KLE//VFELOER Bright People,Bight Solutions. utility clearance at each location. The private utility locator will scan the sidewalk and parking lane of North El Dorado Street for the presence of 500-gallon UST. The project boundaries will be marked and designated in white spray paint and USA will be contacted to mark the Site for public underground utilities. Prior to drilling, each boring location will be cleared via hand tools to 5 feet bgs, depending on nearby subsurface utilities. Kleinfelder will then direct the drilling subcontractor to collect continuous core samples via a direct-push rig to gather soils for logging and sampling purposes. 3.3 SAMPLING LOCATIONS Kleinfelder proposes advancing six soil borings (KLF-1 through KLF-6) using direct push drilling methods. Based on the presumed groundwater depths at the Site of between 12 and 15 feet bgs,the six soil borings will be drilled to approximately 18 feet bgs to gather soil and groundwater samples to submit for laboratory analysis. Proposed boring locations are located near RECs from former Site activities to focus the assessment near the locations most likely to have environmental impacts (Figure 3). Soil will be screened with a photoionization detector(PID)for the presence of volatile organic compounds. The PID will be calibrated with 100 ppm Isobutylene at the beginning of the field day. Field PID readings will be recorded on the field boring logs and included in the final logs.Additionally,field observations that may indicate contamination (such as soil staining and/or petroleum or solvent odors) and depth that water is encountered will be recorded on the field logs and included in the final logs. Location data from each sampling point will be collected, by pacing or measuring wheel from landmarks that can be identified on aerial photographs and in the field using a hand-held GPS or mobile device application. This information will be recorded on the field maps and boring logs. Any field notes or photographs collected during drilling will be recorded and stored in the project file location and can be provided or included in the final report, as needed. 3.3.1 Soil Sampling Soil sampling will be conducted by Kleinfelder under the direction of a licensed Professional Geologist (PG).Soil samples will be collected either from a hand auger bucket or from direct push acetate liners and placed into laboratory provided jars. Soil samples collected for Total Petroleum Hydrocarbons (TPH) as gasoline (TPH-g) or volatile organic compounds (VOCs),will be completed via method 5035 to reduce the volatilizing the COPCs in the soil samples. Boring logs will be prepared to document lithologic descriptions 25001155.006A/ST0240174614 Page 5 of 17 November 8, 2024 ©2024 Kleinfelder www.kleinfelder.com