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• Appendix A investigation. Any deviation from the following procedures must be approved a nd clearly documented in the daily field logbook.This section includes equipment and methods used for: • Excavation confirmation soil sampling • Surface and shallow soil sampling • Trenching subsurface sampling • Direct push drilling for collection of grab groundwater samples • Surface water sampling • Sediment sampling • Soil vapor sampling • Sample handling procedures. Attachment 1 provides standard operating procedures for the field activities thE t are planned to be performed as described in the work plan. Example forms that will be used dur.ng the field investigation are provided in Attachment 2.Table 1 provides specific information regarding planned sampling methodology at each of the proposed sampling locations. A1.2.1 Sample Types Soil,water, sediment and soil vapor samples will be collected as part of this investigation. A1.2.2 Soil Samples The three types of soil samples including excavation confirmation samples, s ace and shallow samples, and sub-surface trenching samples from test pits will be collected during theo M&C field investigation. The three types of soil samples are described below A1.2.2.1 Excavation Soil Sampling Excavation confirmation soil samples collected during this investigation will a collected from the sidewalls and floors of previously excavated excavations. One soil sample w' 1 be collected from each side wall and two soil samples will be collected from each excavation floor. idewall samples will be collected from the approximate mid-point of the sidewalls length and depth. ach floor sample will be collected approximately 1/3 distance from each end of the excavation in a lin that runs the length of the excavation. Where possible, excavation confirmation soil samples will be co lected by driving a stainless steel tube directly into the sidewall or by using a hand-operated stainless steecore sampler capable of retrieving undisturbed soil samples. Surface debris will be cleared prior to sa pling. The drive sampler will be pressed into the soil at an angle of 45 to 90 degrees until the 6-inch length of the sample tube is filled with soil. Samples for VOC analyses will be collected by inserting an Encor6m sampler directly into the sidewall as described below. If the soil is extremely coarse-grained( .g.,large gravel) such that the clasts are larger than the diameter of the EncoreTm samplers,tubes of soil will be submitted in lieu of the Encor6m sampler, and recorded in the daily field logbook and the Chain f Custody. KE61125 APPENDIX A MACTEC Engineering and Consulting, Inc. A2 September 28,2005