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4.0 FIELD SAMPLING PLAN 4.1 BACKGROUND Background information related to the sampling program to be conducted at the Site is included in the previous text, in particular Section 1.2, Section 1.4, and the majority of Section 3.0. The attached figures graphically depict pertinent information regarding the Site. The goals of the PEA sampling activity are stated in Section 2.0. 4.2 SAMPLING STRATEGY AND APPROACH All engineering or geologic work, performed as a portion of the PEA, will be performed or supervised by a registered professional engineer (PE) and/or registered geologist (RG) in compliance with the requirements of the Professional Engineers Act, Business and Professions Code sections 6700-6899 and Section 7838, and the Geologist and Geophysicists Act, Business and Professions Code sections 7800- 7887. The Quality Assurance Project Plan (QAPP) and the Health and Safety Plan (H&SP) pertinent to the proposed sampling investigations are presented in Appendices A and B, respectively. The field sampling investigation will consist of a soil gas survey and soil sampling investigation to assess environmental conditions at suspect areas identified in the Phase I ESA report and during preparation of this Work Plan. The soil gas survey will be conducted concurrently with the soil sampling investigation. Subcontractors will be selected for conducting a soil gas survey and for drilling and collecting soil matrix samples as specified in this Work Plan. URS or the drilling subcontractor will be responsible for utility clearance and obtaining any required agency permits prior to initiating any subsurface investigation. LUSD is to provide signed permission from the Site property owners for sampling activities. A State- certified laboratory will be selected for analysis of collected soil matrix samples. Should Hydropunch sampling be required due to the presence of perched water, the drilling subcontractor and the laboratory will be qualified to collect or analyze the groundwater samples. Sample locations will be measured and noted in the field with English standard units. The following sections describe the sampling strategy, investigative methods and procedures, sample analysis program, sample handling, decontamination procedures, and management of investigation-derived wastes. Figure 3 shows all sampling locations planned for this PEA. 4.2.1 Soil Gas Sampling Table 1 presents a summary of the soil gas sampling and analyses planned for this PEA. As required in the DTSC scope of work, soil gas sampling will be conducted at 21 onsite locations (SG-1 through SG- 21). The proposed sampling locations are set near site features of concern and throughout open areas to provide representative coverage of the Site (Figure 3). If appropriate, sampling locations will be adjusted based on Site conditions encountered. As set forth in the DTSC work order, soil gas sampling and analysis will be conducted in accordance with the current version of the DTSC Advisory - Active Soil Gas Investigations [DTSC, 2003] that incorporates the Los Angeles Regional Water Quality Control Board's Interim Guidance for Active Soil Gas Investigation, dated February 25, 1997 [LARWQCB, 1997]. Soil gas samples will be collected at a depth of 5 feet bgs in all 21 locations. Six, six, and three of the soil vapor probe locations will be set at regular intervals in the southern, northern, and western parcels, respectively. The remaining six locations (SG-16 to SG-21) will be in specific areas of concern — tentatively, three locations inside the building (two near the ASTs and oil-filter drain rack, and one near Page 13 PAPEA Lockeford\Work Plan\Lockeford WP.doc