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Quality Assurance Procedures <br /> Soil Sample Handling <br /> Sample identification and chain-of-custody procedures ensure sample integrity, and document <br /> sample possession from the time of collection to its ultimate disposal. Each sample container <br /> submitted for analysis is labeled to identify the job number, date, time of sample collection, a <br /> sample number unique to the sample, any in-field measurements made, sampling methodology, <br /> name(s) of on-site personnel and any other pertinent field observations also recorded on the <br /> field excavation or boring log. If soil samples cannot be delivered to the analytical laboratory <br /> on the same day as collected, they are stored under refrigeration until the first opportunity for <br /> submittal. <br /> Chain-of-custody forms are used to record possession of the sample from time of collection to <br /> its arrival at the laboratory. During shipment, the person with custody of the samples <br /> relinquishes them to the next person by signing the chain-of-custody form(s) and noting the date <br /> and time. The sample-control officer at the laboratory verifies sample integrity, correct <br /> preservation, confirm collection in the proper container(s), and ensure adequate volume for <br /> analysis. Samples are assigned unique laboratory log numbers for identification throughout <br /> analysis and reporting. The log numbers are recorded on the chain-of-custody forms and in the <br /> legally-required log book maintained in the laboratory. The sample description, date received, <br /> client's name, and any other relevant information is recorded. <br /> Decontamination and Equipment Maintenance <br /> Field equipment, truck-mounted augers, soil sampling tubes, and other tools are thoroughly <br /> decontaminated before being introduced to field sampling areas. Plastic sheets and paper <br /> towels are placed beneath sampling tools and containers at each sample locality to preclude <br /> accidental cross-contamination of sampling supplies with surface soil and debris. Final Rinsates <br /> from decontamination work may be sampled and analyzed. <br /> -� Sierra-Pacific Groundwater Consultants, Ina C-1 <br />