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Phase 11 Environmental Site Assessment Report Page 2 WESTLAKE SUBDIVISION VILLAGE E, G, H, I AND J Regatta Lane Stockton, California WKA No. 13221.02 July 27, 2021 2.0 SAN JOAQUIN COUNTY SOIL BORING PERMITS San Joaquin County regulations required that WKA submit applications for Site Mitigation Well and Boring Permits (Boring Permits) for borings planned for locations on each of the four parcels comprising the Site. WKA changed the sample collection process from using borings to using test pits because of unexpected difficulties in moving this project forward. WKA was still required to obtain San Joaquin County Boring Permits, one for each of the four Assessor's Parcel Numbers, and to file a Site Mitigation Master File Record Information Form for this study. Copies of the permit applications and the File Record Information form are provided in Appendix A of this Report. 3.0 FIELD ACTIVITIES The purpose of the activities comprising this Scope of Services was to evaluate surface soil for the potential presence of chemical residues arising from the Recognized Environmental Conditions (RECs) that were identified by the Phase I ESA study. The RECs addressed by this report are listed below. • The potential presence of OCPs and total arsenic in soil that was excavated to construct the lake and that was placed as fill over the remaining portion of the Site. • The potential presence of OCPs and total arsenic in soil 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 that was placed as fill over the Site. The following sections describe activities to collect soil samples from locations over the Site. Soil Sample Locations Figure 4 illustrates the 64 sample locations (S1 through S64) that were distributed over the 93.62-acre area comprising the Site. WKA also collected samples from eight locations (SP1 through SP8) that represented soil stockpiled within the Site. WKA understands that the stockpiled soil is excess from underground constructions and that the stockpiled soil will be used as fill for the excavations. WKA employed geographic information system (GIS)