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Chevron U.S.A. - Page 10 <br /> I <br /> gradient assessment. <br /> Soil and ground water samples would be maintained and transported under <br /> f chain of custody protocol to a State-approved laboratory for chemical analysis. <br /> Soil samples would be analyzed to detect the presence and concentration of <br /> benzene, toluene, xylenes, ethylbenzene and total <br /> petroleum hydrocarbons. Ground <br /> `'' water samples would be analyzed to detect the presence and concentration of <br /> l <br /> benzene, toluene, xylenes, TPH, and selected samples for total lead. <br /> f <br /> It is possible to interpret in-situ hydraulic conductivity values by means <br /> of tests carried out in a single well. The test is initiated by causing an <br /> fa N instantaneous change in the water level in the well by a alidden introduction of a <br /> aknQFn_vo.1uma_nf water. This method used to test the characteristic is referred to <br /> as a slug test, The method of interpreting the water level versus time data which <br /> obtained by the slug test will be taken from Hvorslev (1951) . <br /> ah" it Eaz-25e- ",,E ;Q <br /> ;: r•+ The existing monitoring wells installed by others at the subject property <br /> were intended primarily as monitoring devices, and the aquifer penetration of the <br /> wells was limited to obtain data describing water level depths and water quality <br /> sampling. Therefore, testing parameters have been established based upon those <br /> conditions which assume the bottom of the well intake would be representative of <br /> the base of the aquifer (a partially penetrating yell) . this assumption was made <br /> in the event that pumping from one of the partially penetrating wells may occur <br /> at the subject property as a part of the remedial effort. <br /> DANA s& MOORL <br />