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27 November 1996 <br /> AGE-NC-95-0112 <br /> Page 3 of 5 <br /> Between 31 July and 29 August 1996, the ,acuum extraction unit operated a total of 576 6 hours, <br />' between 29 August and 30 September, the extraction unit operated a total of 199 3 hours, between <br /> 30 September and 30 October, the extraction unit operated a total of 624 8 hours This data, the <br /> analytical results of the vapor samples and an average flow rate of 70 cfm were used to calculate the <br />' approximate mass of extracted gasoline during these periods The mass calculations are attached in <br /> Appendix D <br /> 26 PURGE WATER/ SOIL DISPOSAL <br /> ' On 03 September, purge water stored on the site was transported to PRC Patterson, Inc for disposal <br /> The purge water was transported under non-hazardous waste manifest by Nor Cal Oil of Turlock <br /> ' A copy of the transportation manifest is included in Appendix E Drummed soil was stockpiled on- <br /> site on plastic sheeting and spread for aeration <br /> 30 FINDINGS <br /> 3 1 GROUND WATER ELEVATION AND FLOW DIRECTION <br /> ` Between July and August 1996, ground water elevation decreased an average of 1 43 feet Ground <br /> water elevation increased an average of 0 04 feet between August and October 1996 Ground water <br /> continues to remained below the tops of the screened intervals in all monitoring wells at the site The <br /> relative ground water elevation data is given in Table I Ground water mounding was observed <br /> during both the August and October monitoring events Relative ground water elevations for August <br /> and October 1996 are depicted in Figures 3 and 4 <br /> 32 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> ' TPH-g was detected in the ground water sample collected from MW-1 at a concentration of 340 parts <br /> per billion (ppb, reported as micrograms per liter) Ethylbenzene and xylenes were detected in the <br /> ' sample from MW-1 at concentrations of 2 2 ppb and 3 9 ppb, respectively Petroleum hydrocarbons <br /> were not detected in samples collected from MW-3, MW-4, MW-5 or MW-7 MTBE was not <br /> detected in the samples collected at the site Samples were not collected from MW-2,MW-6 or MW- <br /> ' = 8 during the current quarter The analytical results of all water samples are summarized in Table 2 <br /> The laboratory report (AAL, Batch No 96-1017-009) and chain-of-custody form are included in <br /> Appendix B <br /> FI <br /> pt' <br />