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KLEI/VFELOER errght veople.Figh[So/uiions. KLE/NFELOEf7 Bright People.Right Solutions. Work Plan - 15178 W Schulte Rd Tracy 95377, Retention Basin project Site History Site has primary been used for agricultural purposes. Based on historical images, a retention basin was constructed at the northeast corner sometime between 1993 and 2003. No other structure or vegetation has been observed on this property. Task 1 — Permitting Kleinfelder will procure a site mitigation drilling permit from San Joaquin County Environmental Health (County)for the proposed soil sampling activities. The County requires a drilling permit for soil bores 3 feet and deeper. This task includes preparing and submitting a workplan, permit application, submittal of a property owner authorization letter to the County, and then coordinating inspections of the field activities. After completion of the field activities, the County requires a report of the field investigation findings be submitted to the County in order to close out the permit. Task 2— Utility Clearance As required by State law, to obtain clearance for underground utilities, Underground Service Alert of Northern California and Nevada (USA North) will be notified in advance of performing ground- intrusive work. USA North will be contacted after the proposed sampling locations are marked by Kleinfelder, and a minimum of 2 business days (not including the day of notification) prior to initiating the intrusive activities. Kleinfelder previously performed a geophysical survey for utilities at the Site in the vicinity of the geotechnical bore locations. Utilities remain marked out across the Site. Task 3— Soil Sampling and Analysis Kleinfelder intends to collect soil samples for environmental analysis from five bores to be advanced at the Site to total depths of approximately 15 feet below ground surface (bgs). The deeper bores will be advanced using a hand auger to approximately 5 feet bgs and then to their proposed total depths using a direct-push drilling rig. Soil samples will be collected from approximately 6 inches bgs (near surface), 2.5 feet bgs, 5 feet bgs, and then at five-foot intervals. Soil will be sampled from each bore using either the hand auger (for samples collected from depths less than approximately 5 feet bgs)or a sampler lined with polyvinyl chloride (PVC)sample sleeves of up to 4 feet in length (for direct-push samples collected from depths deeper than approximately 5 feet bgs). Following retrieval of the hand-auger barrel or sampler, some of the soil contained within it will be screened in the field for the presence of total volatile organic vapors using a photo ionization detector (PID) calibrated with hexane. The PID readings obtained will be logged along with visual descriptions of the soil. Soil samples collected using the hand auger will be transferred into wide-mouthed glass jars provided by the analytical laboratory, whereas samples collected in the PVC sample sleeves will be submitted to the laboratory in cut-off sleeve segments that have had their ends capped with Teflon TM sheeting and plastic end caps. The portion of each soil sample intended for laboratory volatile organic compound (VOC) analysis will be preserved in the field consistent with United States Environmental Protection Agency (US 20190071.001A/LH23C153083 Page 1 of 4 April 28, 2023 Copyright 2023 Kleinfelder www.kleinfelder.com