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MPCOSTCO.001C/LGH21L134434 Page 2 of 5 December 17, 2021 © 2021 Kleinfelder www.kleinfelder.com KLEINFELDER 24411 Ridge Route Dr., Suite 225, Laguna Hills, CA 92653 p | 949.727.4466 f | 949.727.9242 PROPOSED SCOPE OF WORK The proposed scope of services consists of four tasks, discussed in the following sections. Task 1 – Project Coordination, Work Plan and Permit Procurement Activities of this task include coordination with representatives of Costco and Costco’s general contractor (Contractor) performing the upgrade work, and scheduling of field activities, which will be coordinated with the Contractor’s staff that will already be on Site preparing for the gasoline station construction work. Kleinfelder will procure the necessary San Joaquin County Environmental Health Department (SJCEHD) Site Mitigation Boring permit in order to drill boreholes for the proposed pre -profiling activities below. The SJCEHD permit requires preparation and submittal of this workplan as part of the permit application and submittal of a summary report after completion of the field sampling activities and review of laboratory data. Kleinfelder will prepare a Site-Specific Health and Safety Plan (HASP) to address the health and safety of Kleinfelder’s workers and provide contingency plans for emergencies that may arise during the field work of this Limited Phase II ESA prior to the start of sampling activities. Task 2 – Utility Clearance As required by State law, Underground Service Alert of Northern/Central California and Nevada (USA North) will be notified to obtain clearance for underground utilities. USA North will be contacted after the proposed sampling locations are marked by Kleinfelder and a minimum of 72 hours (3 business days) prior to initiating the intrusive subsurface activities. Additionally, since USA North does not necessarily mark buried utility lines at locations on private property, a commercial geophysical subcontractor will be retained by Kleinfelder to locate and mark detectable utility lines and other identifiable subsurface features that may be present at and proximal to each proposed sampling location. Task 3 – Pre-Profile Sampling Kleinfelder proposes the following: • Advance and sample two soil borings to approximately 20 feet bgs at the location of the proposed 40,000-gallon UST. • Advance and sample six soil borings to approximately 10 feet bgs at the six proposed new column/fuel dispenser locations. All eight proposed soil borings as shown on Figure 2 will initially be advanced using a hand auger to approximately 5 feet bgs as an additional utility clearance precaution. After reaching a depth of 5 feet bgs, the soil borings will be advanced using the direct-push technique (DPT) drilling method by a licensed C-57 drilling subcontractor. Cascade Drilling of Richmond, CA will perform the drilling.