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1.4 Analytical Procedures All soil samples submitted to the laboratory were analyzed for BTEX, 1, 2-dichlorobenzene, 1, 3-dichlorobenzene, and 1, 4-dichlorobenzene by EPA method 8020, TPH by EPA method 8015 (modified) , total lead (TTLC) EPA method 7421, inorganic lead (STLC) by EPA method 6010 and organo lead by ASTM d3237-79 (modified) . 1. 5 Quality Assurance Plan 1. 5 . 1 General Sample Collection and Handling Procedures Proper collection and handling are essential to ensure the quality of a sample. Each sample was collected in a suitable container, preserved correctly for the intended analyses, and stored prior to analysis for no longer than the maximum allowable holding time. Details on the procedure for collection and handling of soil samples used on this project can be found in Section 1. 1 . 1. 5 . 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 container submitted for analysis had a label affixed to identify the job number, 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 mea- surements made, sampling methodology, names of on-site personnel , and any other pertinent field observations was recorded on the borehole log in the field records. All samples were analyzed by a State- 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. The sample-control officer at the laboratory verified sample integrity and confirmed that it was collected in the proper container, preserved correctly, and there was adequate volume for analysis. When these conditions were met, the sample was 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 in the laboratory. The sample description, date received, client ' s name and any other relevant information was also recorded. 1. 5 . 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 follow- ing: