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Kennedy,Jenks Consultants The hydraulic push-drive system (GeoprobeTI or equivalent)will be advanced using 2- or 3-inch outer diameter (OD) steel rods where the lead rod is fitted with a new acetate liner. The soil core is collected in the acetate liner as the rods are advanced in 4-foot or 5-foot increments. The steel rods remain in place as the acetate liners are removed, so that the borehole is continuously cased as it is advanced. The desired sample interval is cut from the acetate liner when it is retrieved. Discrete soil samples will be collected from each boring at a depth of 5 feet bgs, 10 feet bgs and 15 feet bgs. The soil sample interval will be sealed with Teflon TM tape, capped, labeled, and placed in a cooler chilled to 4 degrees Celsius pending delivery to the laboratory. Samples will be delivered to the laboratory using chain-of-custody procedures. If the coarse-grained subsurface is too dense to allow advancement of a hydraulic push-drive sampling system, the drilling system will be changed to hollow-stem augers and samples will be collected using a split-spoon drive sampler. The sampler will be fitted with metal liners and driven to the desired sampling interval, whereupon the sampler is removed and the appropriate metal liner is capped and sealed as described above for submittal to the laboratory. Soil borings will be sealed with neat cement or hydrated bentonite chips in accordance with SJCEHD requirements. Drilling residuals (soil cuttings and decontamination rinsate water) will be placed in sealed containers, pending characterization and coordination for offsite disposal. The containers will be properly labeled and placed in a secure location designated by BNSF. Following acceptance, the drilling residuals will be transported to an appropriately permitted offsite disposal facility. Re-usable sampling equipment will be decontaminated between locations either by steam-cleaning, or washing using non-phosphate soap, a potable water rinse, and a final distilled water rinse. Borings will be logged in general accordance with the Kennedy/Jenks SOG included in Appendix C under the supervision of a California Professional Geologist or Professional Engineer. The boring logs will include soil descriptions using the Unified Soil Classification System (USCS), labeled depths, record of penetrations and recoveries, visual indicators such as staining and discoloration, olfactory indications of chemical impact, estimation of proportions of grain sizes, grading, and moisture content. 3.2.3 Laboratory Analysis Soil samples will be analyzed for TPHd by EPA Method 8015M with silica gel preparation by EPA Method 3630C. The sample holding time is the length of time that a sample or sample extract can be expected to remain representative of environmental conditions. The holding time for TPHd is 14 days. Table 1 provides a summary of the sample collection and analysis. 3.2.4 Laboratory Quality Assurance/Quality Control (QA/QC) Laboratory QC consists of a laboratory and a matrix component. The laboratory component measures the performance of the laboratory analytical process during sample analyses, while the matrix component measures the effects of a specific medium on the method performance. Corrective actions for instrument calibrations or QC sample data that are out of compliance are Page 4 Soil Investigation Work Plan, BNSF Mormon Yard, Stockton, California g;Ysgm,pl3tlmNlJob1191 f 385010.OOynYNBreparlslmiHnresl-xvrXy�lb#Ea