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i <br /> AVERAGE CONCENTRATION BENZENE <br /> (PARTS PER BILLION) <br /> $ i6 <br /> 15 <br /> 14 <br /> h 13 <br /> { a 12 <br /> Z 11 <br /> Z 10 <br /> 0 <br /> 9 <br /> w 8 <br /> U <br /> Z <br /> 0 7 <br /> U <br /> W 6 <br /> � C7 <br /> Q 5 <br /> W <br /> `l 3 <br /> k Z <br /> 1 <br /> 0 <br /> OCT.88 JUNE 89 FEB 91 MAY 91 OCT 91 <br /> MAY 89 JULY 90 APRIL 91 JULY 91 JAN 92 <br /> SAMPLE DATES <br /> 0 BENZENE <br /> E <br /> NOTES: <br />€ Figure A is a graph of average concentration of benzene through time in groundwater beneath the site. <br /> Average concentration was calculated by summing concentrations of benzene in samples collected from wells <br /> MW-1 through MW-5 on the dates the well were sampled. <br /> a <br /> Only samples that contained positive results for benzene were used to calculate the average. <br /> If a well was not sampled on a particular date or if the analysis was negative for benzene then the data was <br /> not used to calculate the average. <br /> I Data from well MW-6 was not used to calculate the average. <br /> FIGURE A <br /> AVERAGE CONCENTRATION BENZENE <br /> Moore Petroleum <br /> 5491 F Street <br /> Banta, Ca. <br /> AEGIS Job Number 90 - 099 <br /> DRAWN BY: Ed Bernard DATE: March 27, 1992 <br /> REVIEWED BY: DATE: <br />