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1 • � ' Van Buskirk Park Golf Course TL No. A68101.02 March 10, 1995 Page 5 4.0 PROPOSED INVESTIGATIVE PROCEDURES The proposed project activities will consist of a field investigation, laboratory analysis, and preparation of a technical report. These activities are summarized in the following subsections. Standard operating procedures (SOPs), relevant to the field and laboratory ' activities, are described in Appendix A. 4.1 Field Investigation ' Twining proposes to contract TBI General Engineering to excavate approximately 120 cubic yards of PPC-containing soils, transport the excavated soil to a storage area on the western ' portion of the golf course, and to backfill the excavation with clean pea gravel. A Twining geologist will supervise and direct excavation activities based on the screening of soils in the field. The screening will consist of visual observation for staining or unusual fluids, unusual odors, and head space analysis with a photoionization detector (PID) for the presence of organic vapors. PID operation and procedures for the performance of head space analysis are described in our SOPS in Appendix A. Upon completion of the excavations Twining proposes to collect soil samples from the floor and walls of the excavation. The soil samples will be collected from the backhoe bucket in stainless steel sleeves. Following excavation activities, one groundwater sample will be collected from groundwater monitoring well MW3 to document groundwater conditions nearest the leak source(s). Soil and groundwater samples collected during this investigation will be sealed, labeled,preserved on ice, and shipped under chain-of-custody documentation to Twinings California-certified analytical laboratory in Fresno, California. The excavated soil is proposed to be stored in a designated area on the western portion of the golf course (Drawing 2). The soil will be placed on and covered by plastic. Disposition of the soil stockpile will be the responsibility of the client. 4.2 Soil and Groundwater An ! i ' Soil and groundwater samples collected during this investigation will be submitted to Twinings California-certified analytical laboratory in Fresno, California. Samples will be analyzed for TPH-D,TPH-G, and BTEX. Proposed preparation and analytical methods for ' the laboratory analyses are summarized in Table 5. A description of laboratory quality assurance/quality control procedures proposed for the analyses are described in the SOPs 1 presented in Appendix A.