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Dense 24 to 38 SPT Sampler 31 to 50 Mod CA Sampler Very Dense > 38 SPT Sampler >50 Mod CA Sampler Relative Density Descriptors for fine grained soils are as follows: Very Soft <1 SPT Sampler 0 to 1 Mod CA Sampler Soft 1 to 3 SPT Sampler 2 to 4 Mod CA Sampler Firm 4 to 6 SPT Sampler 4 to 8 Mod CA Sampler Stiff 7 to 12 SPT Sampler 8 to 15 Mod CA Sampler Very Stiff 13 to 23 SPT Sampler 15 to 30 Mod CA Sampler Hard > 23 SPT Sampler >30 Mod CA Sampler Regardless of the degree of adherence to the ASTM Standard Method, split barrel samplers are used as the preferred method of undisturbed sample acquisition in a hollow stem auger drilling. Upon retrieval of the sampler from the borehole, the sampler should be opened without making contact with its interior contents and the logging personnel should record the percent recovery or length of the sample recovered. Sample containers should be removed with a clean gloved (gloves may not be needed, depending upon requirements of HASP) hand and placed in a clean, dry area for examination and logging. The sample will be described per the above. Any lithologic changes that may be observable in the exposed ends of the intact core over the sampled interval should be recorded on the log before any disturbance thereof. The depth of the lithologic changes should be estimated and recorded on the boring log. The least disturbed sample container of the two deeper six-inch sample increments should be secured with Teflon® or aluminum end sheets and snug fitting plastic end caps, sealed with silicon tape, depending upon testing, sampler may be filled with 1-inch rings instead of 6-inch. Sealing material should also be compatible with subsequent testing requirements. C.4.5 Ambient Temperature Head-Space Organic vapor analyzers such as photoionization detectors (PIDs) are generally used to assess the relative concentration of volatile hydrocarbons in the soil as the borehole is advanced and recorded as a value in parts per million on the boring log. This can be done by placing a uniform amount of soil in a ZiplocO bag, glass jar or other clean container, allowing the soil in the container to equilibrate to the ambient temperature, then inserting the probe of the PID into the sealed container and recording the maximum PID reading. C.4.6 Non-Aqueous Phase Liquid (NAPL) Containing Soil Appropriate observations of NAPL containing soil should include the following: Appearance: If a separate phase liquid appears to be present, it might be described as "dark brown viscous fluid or liquid observed in the soil matrix." This remark should follow the lithologic description in the borehole log. Observations of color should be made such as "black streaks" or "mottled gray to "olive brown", however, it should not be inferred or remarked that the color is a necessary consequence of petroleum staining. Additional Soil and Groundwater Sample Work Plan, Page 6 BNSF Mormon Yard, Stockton, California 11twybnsf2thnstwp wp1201811899020 00_mormon_yard1work_plan_id1appb_sogboreholelogging acpt chng_wp doc