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(KLE//VFELOER <br /> Bright People,Bight Solutions. <br /> 3 PROPOSED SAMPLING ACTIVITIES <br /> 3.1 RATIONALE FOR SAMPLING STRATEGY <br /> This Work Plan has been prepared based professional judgement and the general conformance guidance <br /> listed below: <br /> • ASTM E1903-11 Standard Practice for Environmental Site Assessments: Phase II Environmental <br /> Site Assessment Process <br /> • DTSC Preliminary Endangerment Assessment Guidance Manual (January 1994 Interim Final — <br /> Revised October 2015) (DTSC PEA Guidance Manual); <br /> Kleinfelder proposes advancing six soil borings using direct-push drilling methods to approximately 15-20 <br /> feet bgs across the Site to gather soil and groundwater samples to submit for laboratory analysis for <br /> chemicals of potential concern (COPCs). Grab groundwater samples will be collected from open borings. <br /> The goal of this sampling is to investigate potential soil, and groundwater contamination at the Site from <br /> the previous Site use as auto repair, a Chinese laundry, the presence of a 500-gallon gasoline UST within <br /> the El Dorado Street alignment, and the two inactive hydraulic ram elevators. <br /> 3.2 PRE-FIELD ACTIVITIES <br /> Pre-field coordination activities will include the coordination of environmental sampling activities, <br /> obtaining permits,scheduling with the Client,and the preparation of a Site-Specific Health and Safety Plan <br /> (HASP). <br /> Kleinfelder will apply for and obtain a drilling permit from the EHD prior to the implementation of field <br /> activities. <br /> Kleinfelder will coordinate with the Client for Site access and scheduling to ensure the safety of both <br /> Kleinfelder personnel. It is Kleinfelder's goal to minimize the impact to onsite operations to the extent <br /> practicable while performing the investigation. <br /> Prior to mobilization, the proposed boring locations will be marked for Underground Service Alert (USA) <br /> with white paint or flags at least 72 hours prior to the start of work and a private utility locater will provide <br /> 25001155.006A/ST0240174614 Page 4 of 17 November 8, 2024 <br /> ©2024 Kleinfelder www.kleinfelder.com <br />