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SECTION 1 INTRODUCTION Sage understands that Westlake has purchased the CertainTeed facility located at 300 South Beckman Road, in Lodi, San Joaquin County, California. As a part of Westlake's due diligence, a Phase II Environmental Investigation was requested in order to assist in determining potential existing environmental liabilities at the facility. 1.1 Background An ENVIRON Phase I ESA dated December 2012, was provided to Sage for review. Based on a review of the 2012 ENVIRON Phase I ESA Report, in which ENVIRON stated that they"did not identify any RECs in connection with the property", and understanding that the ENVIRON report had been prepared for the Saint-Gobain Corporation(the owner), Sage recommended that a Phase II Environmental Investigation be conducted at the Subject Property for Westlake (the buyer). The ENVIRON report noted what they termed"Other Findings"that discussed the long industrial use of the Site and that CertainTeed was listed on the EDR database as having generated chlorinated solvent waste. Based on review of the provided information and Westlake's instructions, Sage separated the scope of work to differentiate work necessary to close out an REC or other concern identified in the Environ Phase I ESA from the work necessary to establish a baseline of the existing environmental conditions at the facility. Groundwater is believed to be present in the general area at a depth of greater than 50 feet below grade. Potentially small historical spills from the site would not be expected to impact groundwater at these depths. Further, since no groundwater was encountered during the site work, drill cuttings were placed into a five gallon bucket pending laboratory analysis. Sage hand augured all borings to a depth of approximately 5 feet prior to initiating drilling to minimize the chance of encountering subsurface utilities. Sage utilized a PhotoIonization Detector(PID) to survey the soil samples for volatile organic compounds (VOCs). Boring logs were prepared for each sample location. No PID readings were detected during the investigation. 1.2 Objectives The objective of the Phase II Investigation was to determine the current environmental conditions at the plant that existed at the time of the purchase in order to establish any pre- existing liabilities to CertainTeed Corporation and provide a baseline assessment which will separate pre-existing conditions from Westlake. Sage Environmental Consulting,L.P. 1-1 Westlake Chemical Company June July 2013 Lodi,CA,Phase II Investigation