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Phase II Additional Subsurface Investigation Tracy Comers Shopping Center 3225 North Tracy Boulevard Tracy,California 95376 Partner Project Number 14-129814.3 January 27,2015 Page 17 As noted above, the WQGs were developed using default assumptions (e.g., standard exposure factors) and, consequently, are only meant for screening level assessments. The WQGs should not be considered enforceable regulatory standards. Cleanup levels ultimately dependent on site-specific factors and are established by the regulatory agencies on a case-by-case basis. Summary and Conclusions Partner conducted a Phase II Additional Subsurface Investigation at the subject property to collect soil and/or groundwater samples in the vicinity of chlorinated solvents previously detected in sub-slab soil gas collected as part of the Phase II Subsurface Investigation conducted by Partner in December 2014. The scope of the Phase II Additional Subsurface Investigation included four borings for the collection of soil and groundwater samples. Four soil samples and three groundwater samples were analyzed for PCE and daughter compounds. Material encountered in the upper 10 feet bgs consisted of brown, dense, damp clay with some medium sand., At 10 feet bgs, the subsurface consisted predominantly of brown and red well,graded wet gravels. Groundwater was encountered during this investigation between 9.1 and 10.2 feet bgs. Based on the field observations and analysis of soil and groundwater samples there is possible evidence that constituents may have migrated to shallow groundwater underlying the subject property. Based on the Subsurface Investigation described above and the Phase II Subsurface Investigation reported by Partner on December 19, 2014, there is evidence of a release of PCE from the subject property which has spread to the exterior of the subject property. Partner recommends that the property owner report the analytical results to the San Joaquin County Environmental Health Division and conducting additional assessment at the subject property. Limitations This Report presents a summary of work conducted by Partner. The work includes observations of site conditions encountered and the analytical results provided by an independent third party laboratory of samples collected during the course of the project. The number and location of samples were selected to provide the required information. However, it cannot be assumed that the limited available data are representative of subsurface conditions in areas not sampled. Conclusions and/or recommendations are based on the observations, laboratory analyses, and the governing regulations. Conclusions and/or recommendations beyond those stated and reported herein should not be inferred from this document. Partner warrants that the environmental consulting services contained herein were accomplished in accordance with generally accepted practices in the environmental engineering, geology, and hydrogeology fields that existed at the time and location of work. No other warranties are implied or expressed. Reports, both verbal and written, as they pertain to the property located at 3225 North Tracy Boulevard in the City of Tracy, San Joaquin County, California, are for the sole use and benefit of Stuart LTD PARTNER