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PRE-TANK REPLACEMENT Site Assessment Work Plan <br />4315 Waterloo Road Stockton, CA. <br />Aegis Project No. 89-047 <br />Page 13 <br />If these conditions are met, the sample will be assigned a unique log <br />number for identification throughout analysis and reporting. The log <br />number will be recorded on the chain-of-custody form and in the <br />legally-required log book maintained by the laboratory in the labora- <br />tory. The sample description, date received, client's name and any <br />other relevant information will also be recorded. <br />4.5.3 Analytical Quality Assurance <br />In addition to routine calibration of the analytical instruments with <br />standards and blanks, the analyst is required to run duplicates and <br />spikes on 10 percent of the analyses to insure an added measure of <br />precision and accuracy. Accuracy is also verified through the follow- <br />ing: <br />U.S. Environmental Protection Agency (EPA) and State <br />certification programs. <br />Participation in an interlaboratory or "round-robin" quality <br />assurance program. <br />Verification of results with an alternative method. For example, <br />calcium may be determined by atomic absorption, ion <br />chromatography, or titrimetric methods. Volatile organics may be <br />determined through either purge and trap or liquid-liquid <br />extraction methods. <br />4.5.4 Miscellaneous Checks of Accuracy <br />Where trace analysis is involved, purity of the solvents, reagents and <br />gases employed is of great concern. The laboratory maintains a service <br />contract on all major instrumentation; gas chromatograph, atomic <br />absorption, ion chromatography, and total organic carbon analyzers are <br />all serviced and maintained regularly. <br />The above program is more than sufficient for most needs. Additional <br />quality assurance such as spikes and duplicates on all analyses, will <br />be provided if requested. <br />5.0 SCHEDULE <br />Aegis will proceed with the work outlined in this plan when approval <br />is obtained. A drilling crew will be mobilized to drill the proposed <br />borings within two weeks of approval of this plan. Forty eight hours <br />notice will be given to San Joaquin County Health District prior to <br />commencement of field work. Laboratory analysis of soil samples will <br />require one week. A summary report of the assessment results including <br />information on subsurface soils and hydrologic conditions, <br />conclusions, and recommendations will be prepared within a month after <br />laboratory results are received.