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1 Introduction The United States Environmental Protection Agency(U.S. EPA) Region 9 directed Ecology& Environment, Inc.'s (E & E) Superfund Technical Assessment and Response Team(START) to conduct a Targeted Brownfield Assessment(TBA) at the El Concilio No. 2 property, located at 1116 East First Street, Stockton, San Joaquin County, California(Figure 1, Appendix A). This sampling effort was implemented following award of a TBA grant to the City of Stockton Redevelopment Agency(CSRA) for assessment of the El Concilio No. 1 property. CSRA will contribute the land and the National El Concilio Organization (NCLR) Council for the Spanish Speaking will fund the project to redevelop the property for construction of a new commercial office for the NCLR. The subject property occupies 1.98 acres of land currently owned by the CSRA (southern portion) and by the City of Stockton(northern portion). The northern portion of the site is currently occupied by the City of Stockton Fire Department Station 3 and is developed with a fire house, storage garage, concrete and asphalt parking areas, and an open stairway structure used for firefighting training. The southern portion of the site is currently vacant with no structures and is zoned for commercial purposes. Figure 1 (Appendix A) is a map showing the general site vicinity. Figure 2 (Appendix A) is a site map showing site features and surrounding areas. The subject of this assessment is assessor's parcel numbers (APN) 169-030-05, 169-030- 06, and 169-030-13, and will be referred to as the El Concilio No. 2 (site). As part of this TBA for the subject property, START prepared a site-specific field sampling plan (FSP) for collection and laboratory analysis of soil and groundwater samples. The U.S. EPA Quality Assurance Office approved the FSP (Field Sampling Plan, Targeted Brownfields Assessment, El Concilio No. 2 Property, 1116 East First Street, Stockton, California, dated August 2010 [E & E 2010a]) on December 10, 2010 (U.S. EPA Quality Assurance Office document control number BNFD0424SV2). This assessment builds upon findings from a 2010 Phase I ESA prepared by E & E, (E & E 2010b). The assessment is also intended to provide the appropriate environmental data required to make decisions regarding redevelopment of the property. Following are the specific sampling objectives included in the FSP: • Assess potential on-site contamination to the surface and subsurface soils related to the historical use of the property and neighboring properties; • Assess potential contamination to groundwater beneath the site by collecting groundwater samples from 8 borings drilled into the first water bearing zone; and • Assess potential contamination to soil gas on the site and the presence of vapor intrusion pathways. This report was prepared based on the proposed scope of work presented in the FSP and the results of the START field assessment activities conducted to implement the FSP in January 1-1