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collected by using a 24 inch long by 7/8 inch inner diameter split spoon sampler. The soil sampler threads to the inner rod that is placed inside the outer rod. The two rods are driven simultaneously for 24 inches. The inner rod is retrieved with the sampler attached and the outer rod remains in the hole and acts as a temporary casing to keep the hole from caving. Samples will be collected using butyrate E plastic, brass, or stainless steel liners, as appropriate. Ends of the sleeves will be covered with teflon wrap, capped, and taped. Samples will be analyzed for volatile organic compounds and MTBE, TPH for gasoline, semivolatile organic compounds, pesticides, and metals. Sample''containers will be filled to the top, taking care to prevent soil from remaining in the lid threads prior to being closed to prevent potential contaminant migration to or from the sample. Sample containers will be closed as soon as they are filled, chilled if appropriate, and processed for shipment to the laboratory. . Soil cuttings will be placed into an appropriately labelled,container and sealed (proper disposal pending analysis). Probe holes will be filled with either,.neat cement or bentonite grout. The probe holes will be backfilled by pulling the probe rod and grouting the open hole. If there is collapse, the grout may be pumped into the outer rod and a possibility for the probe hole to withdrawn to insure a:proper seal of the probe hole. I� 6.3 Sediment Sampling J As shown in Figure 3-1, two sediment samples and one duplicate sample will be collected at two random locations in the Stockton Deep Water Channel directly underneath the parking lot. Access to the sampling location's will be by a flat-bottomed boat capable of holding a minimum of 2 people, including sampling equipment and supplies. Flashlights or other illumination devices will be required during sampling. Sampling will take place during low tide, such that the depth to the channel bottom is minimized. Sediment samples will be collected from the Stockton Channel bottom from a depth of approximately 4 to 8 inches using a pre-cleaned sediment grab sampler. The grab sampler will�be able to collect an undisturbed bottom sample at low tide with minimal .disruption of the surface layer. The grab sampler shall be held in the open position during descent and activated upon reaching the bottom of the channel. The body is weighted to assist during penetration of the;'surface layer. The sampler will either rely on spring tension or other mechanical means for closing a set of jaws around a volume of sediment material just prior to retrieval. When the sampler is 6 inches into the sediments, it will be slowly withdrawn. Sediment will be transferred from the sampler to the sample containers using a trowel. Sample containers will then be filled ',to the top and measures will .be taken to prevent soil from remaining in the lid groves prior to being sealed in order to prevent potential contamination migration to or from the sample containers. Sample containers will then be chilled, placed in a cooler, and processed-for shipment to the laboratory. 6.4 Wood Sampling Below the parking garage are over 100 pilings, spaced approximately 20 feet apart, and r approximately 20 feet long with 12" to 14" diameters. Approximate locations of the wood E pilings are shown on Figure 3-2. Locations are random, but an,attempt will be made to collect C) n:1362I0198SAPlwebsap2.wp5 VJEBEk'BLOCK (Area 9) Sampling and Analysis Plan i Page 13