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t\iCLE/NFELOER 2 BACKGROUND PURPOSE SJCPW forwarded comments and information/data from Mr. Joe Niland of Geosyntec, who is reported to Kleinfelder as an appointed trustee for Lincoln Center for current environmental remediation work. Mr. Niland provided several figures depicting soil and soil vapor (SV) sampling locations, analytical results and a SV extraction system layout diagram (see Appendix E). These diagrams included color coded illustrations (Figure 11 and 18) which included the "Distribution of Highest Detected, Concentration of PCE [tetrachloroethene] in Soil Vapor, 0-5 feet Below Ground Surface (bgs]," and WE and Hazardous Substances Detected in Soil Samples and Soil-Vapor Plume, (5-16 ft bgs)," respectively. Based on this information and additional background data researched by Kleinfelder summarized in Section 3, Kleinfelder proposed advancement of approximately nine probes down the centerline of Benjamin Holt Drive in the project area with 50 foot spacing between approximate Station 15+00 to 17+00, and with 150 foot spacing through the remainder of the alignment to approximate Station 24+00 (near Pacific Avenue, see Plate 2). The total probing depth was proposed at 6 feet bgs which is below the estimated depth of the proposed storm drain of 4'/z feet. Based on background information, Kleinfelder expected groundwater to be approximately 25 to 30 feet bgs; therefore, we did not anticipate encountering groundwater at the proposed total assessment depth of 6 feet. This fieldwork was proposed to evaluate petroleum constituents and VOCs in shallow soil along the proposed storm drain alignment. The VOC suite proposed included the primary contaminant tetrachloroethylene (PCE) usually associated with dry cleaning operations. Based on an email addressed to Ms. Nguyentan, dated February 15, 2013, Mr. Niland had also reviewed Kleinfelder's proposal/scope of work and commented that the "general frequency of the sample collection proposed in the area impacted historically by dry cleaner operations associated with Lincoln Center (dry cleaner area) seems adequate." Mr. Niland also suggested use of an "En Core TM sampler or similar device, in order to obtain accurate results," as relevant to VOCs. An En Core TM sampling device was developed specifically for collection of soil samples primarily for VOC analyses and collects relatively small volumes of soil in a sealed composite polymer sampler using an "airtight sealing cap," and an internal O-ring seal. Based 133385.4//ST013R0698 Page 2 of 12 January 7,2014 Copyright 2014 Kleinfelder