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Work Plan for Phase 11 Environmental Site Assessment Page 2 Westlake Villages E, G, H, I, & J WKA No. 13221.02 July 13, 2021 Scope of Services This Scope of Services describes activities to collect information required to characterize the three Recognized Environmental Conditions (RECs) identified in the Phase I ESA Report. The RECs addressed in this proposal are listed below. • The potential presence of organochlorin pesticides (OCPs) and total arsenic in soil that was originally exposed at the ground surface of the Site. • The potential presence of OCPs and total arsenic in soil that was imported to the Site and that is stockpiled at locations within the Site. The potential presence of OCPs and total arsenic in soil that was covered by the approximately 2'/2 feet thickness of soil placed as fill over the Site. WKA identified recommended sampling procedures for soil that formerly supported agricultural activities using the Department of Toxic Substances Control (DTSC) Interim Guidance for Sampling Agricultural Properties -Third Revision (August 7, 2008)' (Agricultural Guidance). WKA identified recommended sampling procedure for soil that was imported to the Site and stored in stockpiles using the DTSC Information Advisory, Clean Imported Fill Material 2. Permits WKA submits this work plan in support of applications to San Joaquin County for soil boring permits. The San Joaquin Soil Boring Permit applications have grouped borings within five San Joaquin County Assessor's Parcel and WKA has submitted fees for a Plan Check and for five soil boring permits. Thus, WKA is submitted a total of five Soil Boring Permit applications and Site Mitigation Record Information forms for each of the five Assessor's Parcels comprising this project. For the purposes of the remainder of this work plan, WKA will describe the distribution of sample locations over the entire area covered by the five Assessor's Parcels. Health and Safety Plan and Underground Services Alert WKA will prepare a Site-specific Health and Safety Plan, mark the proposed sample areas, and notify Underground Service Alert (USA) to request a Dig Permit. WKA will begin sampling activities after receiving clearance from the responding utilities, which is expected to be received no sooner than three business days after our request is submitted. This proposal includes no cost for a geophysical survey to search for underground utilities that Underground Service Alert team members do not identify. WKA will request additional budget authorization if the USA Interim Guidance for Sampling Agricultural Properties (Third Revision) (DTSC August 7, 2008). 2 Information Advisory, Clean Imported Fill Material, (DTSC October 2001). NM