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The oxygen, ferrous iron, nitrate and sulfate levels were tested <br /> for in each wells. The results of the laboratory testing are <br />' shown in Table 3A and the results are contoured in Figures 2, 3 <br /> and 4. No figure for nitrates is presented since all of the <br /> results are non-detect. When comparing the results from this <br /> quarter with last quarter, the data is not clear for oxygen and <br />' sulfate. The ferrous iron graphs indicate the main area of <br /> anaerobic activity is near well 8 and last quarter it was near <br /> well 5. This is expected since this is the center of the <br />' gasoline plume. <br /> Figure 5 is a graph of the TPH concentration in well BM-11 the <br />' down gradient well at this site. As can be seen the plume is <br /> expanding down gradient. <br />' <br /> CONCLUSIONS <br /> The next quarterly monitoring will take place in April , 1997 . <br /> Since the nitrates, sulfates and iron results are not <br />' contributing to our understanding of this plume, we will only be <br /> checking the dissolved oxygen levels during the next sampling <br /> periods. <br />' We have submitted an application with PG&E to install the gas <br /> line, which is needed to operate the Thermal Oxidizer. <br /> Hopefully, this will be accomplished this quarter. <br /> We will be modifying the work plan for remediation to take <br /> advantage of a new process which introduces dissolved oxygen into <br /> the groundwater. This amendment will be accompanying this <br /> report. <br /> A Hazardous Waste Manifest is attached showing the removal of the <br /> purged water from the site. <br /> Yours truly, <br /> L� <br /> tk C <br /> o <br /> John Cussen +' �� ""�' <br />' Reg. Environmental Assessor #1979 <br /> RG #6506 <br />' Incl. 1 Water Analysis i` # <br /> 1 Chain of Custody OF� <br /> 9 Sampling reports. <br />' 5 Plots. <br /> cc: Mr. Roger Liston, Darpetro, Inc. <br /> Mr. G.L. Boggs, RWQCB <br />' Page 2 <br />