COMPLIANCE INFO_1985-1998 - Laserfiche WebLink

Home Browse Search

1.1 Soil Sampling v Soil samples were collected using a hand auger. After the auger had been advanced to the desired depth, a clean brass tube was then placed in the auger bucket and pushed into the soil in the bucket of the auger. The tube was then extracted and each end of the tube sealed with Teflon tape and a plastic cap. The tube was then labeled with the appropriate identification number. The sample liner was placed in an ice chest which contained pre -frozen blocks of an inert ice substitute, such as Blue Ice. A. 1.2 Sample Identification and Chain -of -Custody Procedures Sample identification and chain -of -custody procedures ensure sample integrity and document sample possession from the time of collection to its ultimate disposal. Each sample contained submitted for analysis had a label affixed to identify the job number, sampler, date and time of sample collection, and a sample number unique to that sample. This information, in addition to a description of the sample, field measurements made, sampling methodology, names of on-site personnel, and any other pertinent field observations were recorded in the field records. All samples were analyzed by a California -certified laboratory. A chain -of -custody form was used to record possession of the sample from time of collection to its arrival at the laboratory. When the samples were shipped, the person in custody of them relinquished the samples by signing the chain -of -custody form and noting the time of shipment. The sample -control officer at the laboratory verify sample integrity and confirms that it was collected in the proper container, preserved correctly, and that there is an adequate volume for analysis. The sample was then assigned a unique log number for identification throughout analysis and reporting. The log number was recorded on the chain -of -custody form and in the legally -required log book maintained by the laboratory. The sample description, date received, client's name, and any other relevant information was recorded. 1.3 Analytical Quality Assurance In addition to routine calibration of the analytical instruments with standards and blanks, the analyst is required to run duplicates and spikes on 10 percent of the analyses to insure an added measure of precision and accuracy. Accuracy is also verified through the following: