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There is no obvious evidence from review of the available aerial photographs included within Partner's December 9, 2015 Phase I Environmental Site Assessment report that indicate the Site was actively cultivated with crops; the western half of the Site historically has been unpaved and not occupied by structures or equipment. However, off-site areas particularly to the south and northeast of the Site appear to have been actively cultivated until sometime prior to 1982. The Site was occupied by what appeared to have been rural and possible farm-related residential structures with an associated barn, sheds and outbuildings and storage of portable agricultural equipment. 1.2 Project Purpose and Description The primary purpose of the Workplan is to describe the activities proposed to further characterize soil, soil gas, and groundwater. The Workplan includes a Site Health and Safety Plan (HASP), a QA/QC Plan, this SAP, and an implementation schedule. In general, the proposed scope of work related to areas of potential impact is as follows: • Indoor air sampling of the Quality Cleaners and adjacent tenant suites; specifically, the Comcast store to the east and the Fred Loya Insurance office to the west, respectively; • Shallow soil gas sampling along the southern boundary of the Site to assess the potential for vapor intrusion related to the residential structures located approximately 100 feet south of the Quality Cleaners; • Installing and monitoring of groundwater monitoring wells at upgradient and downgradient locations relative to the Quality Cleaners to assess the groundwater flow direction and potential lateral extent of PCE, TPH (to account for the possible release of petroleum hydrocarbon-based dry cleaning solvent) and other volatile organic compounds (VOCs) in groundwater. • The vertical characterization of the PCE plume will occur following the confirmation of the groundwater flow direction using continuously cored soil borings and the collection of grab groundwater samples from targeted strata. The location of these proposed borings and the details of the sampling would be included in an addendum to this workplan and submitted to the DTSC for concurrence and approval prior to the commencement of the work. • Soil gas sampling from soil probes along the alignment of an approximately 660-foot long sanitary sewer lateral associated with the Quality Cleaners to assess whether a significant release of PCE has occurred from the sewer lateral.; • Soil, soil gas, and groundwater sampling from soil borings at the inferred locations of a petroleum hydrocarbon release that was discovered during 1991 southwest of the intersection of North Tracy Boulevard and Clover Road and other locations proximate to historical structures as observed in a 1975 aerial photograph; and • Soil sampling for environmentally persistent pesticides in locations formerly occupied by a barn, sheds, outbuildings and storage of trailers and other working areas that may have been where agricultural constituents may have been stored of mixed. 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 2