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Groundwater is believed to be present in the general area at a depth of approximately 50 feet below grade.Potentially small historical spills from the site would not be expected to impact groundwater at these depths. Sage will utilize a PhotoIonization Detector(PID)to survey the soil samples for volatile organic compounds (VOCs)and will collect the sample with the highest PID reading from each boring for analysis. Sage will hand auger all borings to a depth of 5 feet prior to initiating drilling to minimize the chance of encountering subsurface utilities.A boring log will be prepared for each sample location. Drill cuttings will be containerized, characterized and properly disposed upon completion of the project. RECs or Other Concerns ENVIRON did not identify any RECs in connection with the property during the December 2012 Phase I ESA. Based on the ENVIRON Phase I ESA findings,the following issues were identified as either Other Findings or De Minimis conditions: Other Findings Possible Former Use of Chlorinated Solvents CertainTeed is listed on the Resource,Conservation and Recovery Act(RCRA)database as having generated chlorinated solvent waste.Facility personnel interviewed for the ENVIRON Phase I were not aware of the use of chlorinated solvents, although they had only been affiliated with the site since 2002.The ENVIRON report stated that facility persomiel indicated that to the best of their knowledge hazardous waste has always been stored within the building and there were no records of spills or releases of solvents. Long Industrial History of the Site Historical operations back to the late 1960's may have included the use of petroleum products, solvents, adhesives,and other chemicals.The property is also listed on the RCRA database as having generated chlorinated solvent wastes.A 550-gallon gasoline underground storage tank(UST)was operated at the site and reportedly removed in 1988 although no information regarding closure activities was found. Sage Recommendations For both the chlorinated solvent use and long industrial history of the site, Sage proposes to collect one(1)soil sample from a total of three(3) locations fiom either below the floor slab if cracks are identified or as near the preferred location but outside of the Warehouse and Manufacturing Plant. These samples will be analyzed for VOCs,which include petroleum products, chlorinated solvents and many other chemicals. Westlake Chemical Corporation Lodi-Due Diligence Assessment 2