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Date: July 25, 2018 Work Plan for Additional Environmental Investigation, 371 South Garfield Avenue, Manteca, California Scope of Work The scope of work to complete the objectives of the proposed Investigation includes the following three tasks: Task 1 - Pre-Field Preparation Task 2 - Drilling, Sampling, and Laboratory Analysis Task 3 - Data Analysis and Report Preparation Task 1 - Pre-Field Activities Pre-field activities include: Coordination of access with the Manteca Unified School District Update the site-specific health and safety plan (HASP) that was prepared for the Phase II work to include the activities described in this proposal. Site personnel, including on-site subcontractors will be required to familiarize themselves with the HASP and sign an acknowledgment that they have read the HASP. The HASP will identify the specific chemical compounds that have the potential to be encountered at the Site. Excerpts from the HASP identifying the chemicals of potential concern, required personal protective equipment (PPE), key personnel and contacts, and nearest hospital and route map are included as an attachment to this Work Plan to be used by SJCEHD. The full HASP can be provided upon request. Visit the Site to pre-mark proposed drilling and sampling locations in the field for utility clearance purposes. Notify Underground Service Alert of Northern California (800-227-2600). USA will be notified at least 72-hours prior to drilling and sampling activities. USA will mark underground utilities in public rights-of-way in the site vicinity. Prior to conducting intrusive sampling, Terraphase will subcontract with a private underground utility locator to mark proposed drilling areas for the presence of underground utilities. Terraphase will subcontract a licensed drilling contractor and analytical laboratory to complete investigative drilling and analytical work. Terraphase will also rent or purchase sampling and monitoring equipment and supplies, as needed. Task 2 - Drilling, Sampling, and Laboratory Analysis The proposed sampling locations are shown on Figure 2. A soil-gas sample will be collected from each of the six locations at a depth of approximately 15 feet bgs. Sample collection and analytical methods are described below. Task 2.1 Soil-Gas Sampling The six proposed soil-gas boring locations are shown on Figure 2. One sample will be collected from each location at approximately 15 feet bgs. The borings will be drilled by a licensed drilling Page 2 of 4 Terraphase Engineering Inc.