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r Stantec PEA WORKPLAN Proposed Lodi Energy Center Site Lodi, California 5.4.1 Soil Depth-discrete soil samples will be collected from each proposed soil boring location (locations 8 through 27 and Background) at the time of drilling. Depending on depth, soil samples will be collected with an Impact Sampler (i.e., a slide hammer) or from the acetate'liner of the direct push sampler in each soil boring. Soil samples will be collected in stainless steel/brass sleeves, or acetate liners for non-volatile constituents; and will be collected using EPA Method 5035 collection methodologies for volatile constituents. An experienced Stantec geologist or environmental scientist working under the supervision of a California Professional Geologist will conduct the soil sampling. The results of the soil sampling will be documented on a Field Drill Log form. Additional information on specific soil sampling and documentation procedures is included in the SAP (Appendix D). 5.4.2 Groundwater Collection of one groundwater sample from existing onsite monitoring well WSM-3 (Figure 2) is proposed. This well will be purged and sampled in accordance with Stantec's Standard Operating Procedure (SOP) for groundwater sampling (Appendix D). This procedure includes purging at least three casing volumes and collection of a groundwater sample. The purged groundwater will be containerized until proper disposal can be arranged. An experienced Stantec geologist or environmental scientist working under the supervision of a California Professional Geologist will conduct the groundwater sampling activities. Each groundwater sample collected will be documented on a Groundwater Sample Collection form. 5.5 BACKGROUND SAMPLING In accordance with the DTSC PEA Guidance Manual (PEA Manual Section 2.4.2.5), collection of background samples is proposed. The background samples are proposed to be located in the vicinity of the background soil samples previously collected by NCPA's environmental consultant, which is east of the Site beyond the existing WPCF facility and west of the 1-5 freeway (Figure 2). This location was chosen because it has not been developed or altered from prior to construction of the WPCF. Four background locations are proposed designated as BG-4 through BG-8. The numbering scheme continues in consecutive order from the prior background samples to avoid confusion. Soil samples will be collected at the four proposed locations in the same manner and at the same depths as the onsite soil samples (Section 5.4.1). The proposed laboratory analyses for the background samples are listed in Table 1, and selection of analytical parameters is based on analysis for naturally occurring constituents, as well as detection of other constituents during NCPA's prior background sampling. 5.6 SAMPLE ANALYSIS The sampling strategy for the Site is summarized on Table 1. This table includes the proposed laboratory analyses by sample location for the media to be tested. PEA WP-Lodi 11 August 13,2009