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-'a <br /> i ' <br /> r� <br /> nation from the soil baring were submitted to a state-certified laboratory for <br /> chemical analysis. <br /> Samples not preserved for chemical analysis were extruded from the lin- <br /> ers and logged according t he Unified <br /> teriafSoil <br /> was storedon onsitem by an <br /> pending <br /> EMCON geologist. Auger-return <br /> receipt of analytical data to determine the proper disposal method. <br /> 3.2 Monitoring Well Installation <br /> Exploratory soil boring MW-1 was advanced 6 feet into first-encountered <br /> ground water. The boring was converted to a ground-water monitoring <br /> well by installing 2-inch-diameter, schedule 40 polyvinyl chloride casing <br /> A sand <br /> with approximately 14 feet of 0.020-inch machine-slotted <br /> sereely 2 feetbove <br /> `liter pack was placed in the annular space to app <br /> the top of the screen. A 2-foot-thick bentonite seal was placed over the top <br /> of the sand pack, and a bentonite cement seal was placed from the top of <br /> the bentonite seal to within 1 foot of the ground surface. A locking well cap <br /> and traffic-rated vault box set in coauthanz reaccessed Wellthe <br /> const construction <br /> .. protect the .well and prevent un <br /> details are presented in Appendix B. . <br /> a � <br /> 3.3 Well Development and Ground-water Sampling <br /> After installation, monitoring well MW-1 was checked for floating product, <br /> andepth to water was measured. The w <br /> d the <br /> ell was developed by <br /> a d the field personnel using surge block and hand-pumping techniques. <br /> Developmer{t water was stored on site in a labeled 55-gallon drum pend- <br /> ing receipt of analytical data to determine the proper disposal method. <br /> Since no floating product was detected in the well,the well was allowed to <br /> stabilize after development and was then purged and sampled as <br /> described in Appendix C of the May 1991 document entitled Work Plan for <br /> Environment«;Services, 1800 East Fremont Street, Stockton, California. <br /> 3.4 Sample Analysis <br /> Two soil. samples from the exploratory soil boring were submitted to <br /> Columbia Analytical Services, a state-certified laboratory, for chemical <br /> analysis. The 17.5- and 41-foot samples were analyzed since the highest <br /> concentrations of volatile hydrocarbons were indicated for these samples <br /> - -i;� the head-space analysis. The soil samples were analyzed for TPHG <br /> -- . - <br /> 4 Rev.0 July 2,1981 <br /> pjg1g05\9050101d <br /> t • Emcofl Associates <br /> i <br />