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r W= <br /> Chevron U.S.A. <br /> Page 31 <br /> Groundwater was encountered at an approximate depth of 39 feet below the existing <br /> grade at the subject property. The groundwater was interpreted as trending in a <br /> general north to northeasterly direction at the time of our field study. The ground- <br /> water gradient was found to vary from approximately 0.0017 ft/ft -n March 19, 1990 to <br /> 0.0175 on August 17, 1990 as the groundwater receded. During most of 1990 Dames & <br /> W' Moore has observed the drop in groundwater of approximately three feet in five months. <br /> Plates 6A,613, 6C, and 6D at the end of this report illustrate the groundwater flow <br /> direction at the time of our field study. <br /> Chemical analysis conducted on the sail samples obtained from Dames & Moore's <br /> u borings reported the presence of petroleum contamination only at depths at or slightly <br /> above the depth of groundwater. This condition was determined only at monitoring <br /> wells MW-2A, MW-4A, and MW-8. The remaining soil samples obtained from other <br /> monitoring wells drilling and sampling revealed no contamination. The concentrations <br /> of contaminants were reportedly low and are presented in Table!V of this report. <br /> i` Chemical analysis of the groundwater samples obtained from the seven monitoring <br /> e;y <br /> wells at the subject property reported low levels of benzene, and xylenes and total <br /> Petroleum hydrocarbons as gasoline (TPH). A summary of these test results was <br /> presented in Table VI of this report. <br /> t^IY <br /> R <br /> kV 6000-206-0+� <br /> I <br /> Mt llo. <br /> a <br />