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1.0 Site Information and Background This Sampling and Analysis Plan (SAP) has been prepared by Partner Engineering & Science, Inc. (Partner) as part of the Sampling and Analysis Workplan (Workplan) related to the Tracy Corners Shopping Center (hereafter, the Site) located at 3225 North Tracy Boulevard, Tracy, in San Joaquin County, California. The Workplan was prepared in response to the April 24, 2015 Voluntary Cleanup Agreement (VCA) between the project proponent, Stuart Limited Partnership (SLP) and the California Environmental Protection Agency Department of Toxic Substances Control (DTSC) which was executed on May 6, 2015. This SAP is a companion to the Quality Assurance/Quality Control (QA/QC) Plan for the Site. The procedures specified within the QA/QC Plan will be followed for this project. 1.1 Problem Definition The Tracy Corners Shopping Center, developed in 1992, encompasses 8.3 acres with 86,180 square feet of single story commercial tenants located at the southwest corner of the intersection of North Tracy Boulevard and Clover Road within a mixed commercial and residential area of San Joaquin County. The shopping center is currently occupied by retail commercial establishments including a super market, restaurants, nail and hair salons, insurance and financial outlets, an automobile parts store, a hardware store, and various professional services. Based on sampling of soil, soil gas, and groundwater conducted during December 2014 and January and May 2015, the Site has been impacted by the release of tetrachloroethene (PCE) from the Quality Cleaners located at 3081 North Tracy Boulevard and within the shopping center. Trichloroethene (TCE) was also detected in sub-slab soil gas samples. In addition, historical documents indicate that a release of petroleum hydrocarbons, primarily diesel components, may have occurred during 1991 in any of four areas within the northeast, central, and southeastern portions of the Site. To date, the maximum concentrations of constituents detected in samples collected in 2014 and 2015 were as follows: ■ PCE in groundwater: 30 micrograms per liter(pg/L); ■ PCE in sub-slab soil gas: 3,300 micrograms per cubic meter(pg/m3); and ■ TCE in sub-slab soil gas: 350 pg/m3. Concentrations of selected petroleum hydrocarbons within 1991 soil samples were detected as follows: ■ Total petroleum hydrocarbons as gasoline (TPHg): 1.7 milligrams per kilogram (mg/kg); ■ Total petroleum hydrocarbons as diesel (TPHd):170 mg/kg; • Toluene: 0.005 mg/kg; ■ Xylenes: 0.037 mg/kg; and ■ Ethylbenzene: 0.012 mg/kg. Sampling and Analysis Plan Tracy Corners Shopping Center 3225 North Tracy Boulevard Tracy,California 95376 Partner Project Number SM14-129814 Docket Number HAS-VCA 14/15-108 August 15,2016 Page 1