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MOMMINOWW guidelines (CCR Title 8, Section 5192), Atlas will prepare a Site-Specific Health and Safety Plan (HASP) prior to the commencement of fieldwork. The Site-Specific HASP will be reviewed and signed by field staff and contractors before beginning field operations at the site. Planning and Permitting Atlas will schedule drilling subcontractors and coordinate with the laboratory for sampling containers, sample pick-up, and establish adequate turn-around-times for sample results. Prior to commencement of off-site drilling activities, Atlas will obtain an encroachment permit from the City of Stockton. If the proposed boring cannot be installed in the planned location in the City of Stockton right- of-way due to utility or other obstructions, Atlas will modify its location. Atlas will submit a boring permit applications to the San Joaquin County Environmental Health Department (SJCEHD)for the advancement of the soil borings with hydropunch sampling. Underground Utility Locating and Clearance In advance of field activities, Atlas will mark the locations of the proposed boring and vapor point locations in accordance with the Underground Service Alert (USA) guidelines, and notify USA of upcoming subsurface activities in order for existing underground utilities in the area of the proposed work to be located so as to avoid contact with the utilities. Atlas will also contract with a private utility locator to confirm the locations of underground utilities in the vicinity of the drilling locations. Prior to use of drilling equipment, the off-site boring locations will be hand cleared and/or air knifed to a minimum depth of 5 feet bgs. Boring Advancement-Direct Push Drilling Five soil borings are proposed to be advanced at the site and northeast of the site. The proposed boring locations are shown on Figure 2. The borings will be advanced by a California C57-licensed drilling company using truck-mounted Geoprobe® narrow diameter, direct push technology. A field geologist will be present to log drill cuttings and soil samples from the borings. Prior to use of powered equipment, a hand boring will be advanced to five feet bgs at each boring location, to attempt to intercept any previously undetected subsurface utilities or other obstructions. Descriptions of soil types encountered will be recorded on boring logs. Soil samples will be screened with a photo-ionization detector(PID)and up to two soil samples will be collected from each boring for laboratory analyses. The soil borings will be advanced to first encountered groundwater last measured in 2024 to be approximately 31 feet bgs. Groundwater samples will be collected from each of the boreholes using a modified HydroPunch®sampler. Prior to groundwater sampling, a water level meter will be used to confirm that the drive rods do not contain water. The sampler will then be driven to approximately three feet below the desired sampling depth, and retracted three feet to expose the disposable schedule 20 polyvinyl chloride (PVC) screen and allow for groundwater to enter the HydroPunch®sampler. The water sample will be collected by lowering a %-inch diameter stainless steel bailer through the drive rods to groundwater or by using a peristaltic pump with disposable tubing. The groundwater will be bailed from the drive rods and decanted from the bailer into the appropriate lab-supplied containers. Following the collection of the sample,the drive rods will be retracted, leaving the disposable drive tip and four-foot length of PVC well screen in the hole. Following completion, the borings will be grouted through the drive rods or a tremie pipe from the total depth explored to surface grade with neat cement. All soil and groundwater samples collected will be placed in a cooler chilled with ice and transported under chain-of-custody procedures to an Environmental Laboratory Accreditation Program (ELAP) certified environmental laboratory. 5 1 P a g e