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'a tl <br /> 3.3.2 Monitoring Well Installation <br /> 1 The exploratory soil boring will be drilled to a depth of approximately <br /> 15 feet below first-encountered ground water and converted to a ground- <br />' ' water monitoring well (to be designated MW-12). The well will be con- <br /> structed with 2-inch-diameter, flush-threaded, polyvinyl chloride well cas- <br /> ing having a 0.020-inch machine-slotted screen. Based on information <br />' from the other on-site wells, this well will be approximately 80 to 85 feet <br /> deep. Actual boring depths and screen lengths will be determined in the <br />' field by geologic profiles and depth of first-encountered ground water. <br /> More detailed exploratory boring and well installation procedures are pre- <br /> sented in Appendix B. <br /> 3.3.3 Well Development and Sampling <br /> P P 9 <br /> Development of the new well will consist of bailing, surging with a surge <br /> block, pumping, or a combination of these techniques. Development water <br /> will be stored on site in labeled 55-gallon drums. Disposal of the develop- <br /> ment and purge water will be the responsibility of Teichert; however, <br /> EMCON Associates will work with Teichert to determine the appropriate <br /> means of development and purge water disposal based on the analytical <br /> results of the ground-water sample. <br /> After well development is complete, the new well will be allowed to stabi- <br /> lize and will then be purged and sampled. The ground-water sample will <br /> be submitted with a chain-of-custody record to a state-certified analytical ; <br />' laboratory for chemical analysis. In addition to sampling the new well, <br /> EMCON Associates will also purge and sample existing site wells that <br /> penetrate the first-encountered water-bearing zone. Well development and <br /> sampling procedures are presented in Appendix C. <br />' 3.3.4 Sample Analysis <br /> Up to two soil samples and one ground-water sample from the new well <br /> and existing wells that penetrate ground water will be submitted to a state- <br /> certified laboratory for chemical analysis. The samples will be analyzed for <br /> TPHG, TPHD, and BTEX. <br /> 3.3.5 Elevation Survey <br /> As part of the ground-water characterization activities, EMCON Associates <br /> will measure the elevation of the top-of-casing and the ground surface for <br /> f <br /> p#V92V920201 a 8 Rev. 0 June 1, 1992 <br /> Emcon Resonates <br />