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EXECUTIVE SUMMARY Sage Environmental Consulting, LP (Sage)was retained by Westlake Chemical Corporation (Westlake)to perform a Phase II Investigation at the CertainTeed facility located at 300 South Beckman Road, in Lodi, San Joaquin County, California(herein after the Subject Property). The objective of the Phase II was to determine the environmental conditions at the plant that existed at the time of the purchase in order to establish any existing liabilities to CertainTeed Corporation and provide a baseline assessment which will separate pre-existing conditions from Westlake. The Subject Property is located at 300 South Beckman Road in Lodi, San Joaquin County, California. The facility is currently composed of one parcel of industrial property lying within the municipal city limits of Lodi, California. The Subject Property is an 18.11 acre parcel located on the southeastern quadrant of the intersection of South Beckman Road and East Lodi Avenue in Lodi, San Joaquin County, California. The Subject Property is a polyvinyl chloride (PVC)pipe extrusion facility which consists of an 112,500-square foot main building that is located in the central portion of the Subject Property. The single-story, high-bay warehouse and manufacturing building contains production and storage areas (Figure 2). Smaller structures on the Subject Property consist of a blend plant building, an administrative office, a quality control (QC) office, and a storage building; all of which are attached to the main building. A covered shed is present in the northeast corner of the site for storage of raw material and general plant trash. Summary and Recommendations For the purpose of assessment Sage compared detected concentrations to either the EPA Region 9 Commercial Environmental Screening Levels(ESLs)or in the case of TPH,Sage compared detected concentrations to the San Francisco Bay Regional Water Quality Control Board's Commercial Environmental Screening Levels(ESLs). Results of the soil and sediment samples collected for this Phase II Investigation indicate that no Volatile Organic Compounds (VOCs), Herbicides, or Pesticides were detected in any of the soil or sediment samples collected at the Subject Property. TPH DRO and TPH ORO were detected at low levels in the sump samples but were reported well below regulatory limits. Based on the results of the Phase II investigation at the former CertainTeed Corporation property located at 300 South Beckman Road in Lodi, California, Sage has determined that the Other Concerns identified in the ENVIRON 2012 Phase I ESA (Long Industrial Use including potential use of chlorinated solvents and AST use)have not impacted the Site soil. Sage Environmental Consulting,L.P. ill Westlake Chemical Company July 2013 Lodi,CA,Phase II Investigation