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• <br /> lowest levels of contamination_ However, a review of TABLE i <br /> reveals that is not the case. Levels of TPH-G have been higher <br /> than in either MW-2 or MW-4 , except for the 9/93 sampling period, <br /> when MW-4 was slightly higher. Levels of BTEX have also been <br /> higher in most cases, although there does not appear to be a good <br /> correlation between those components. The data continues to <br /> indicate the existence of another offsite source to the north- <br /> northeast may exist. During recently completed work, a monitor- <br /> ing well was placed in the extreme northeast corner of the <br /> property; it may assist in further defining the plume in that <br /> direction. <br /> SUMMARY OF RESULTS O DATE: <br /> I . The lateral extent of the groundwater plume has not yet been <br /> defined; the data from the newly completed wells on the site, not <br /> yet analyzed, may assist in this task. <br /> 2. The groundwater gradient as measured has been consistently in <br /> a southerly direction, which is not consistent with either the <br /> regional gradient or data from nearby monitoring wells located <br /> southeast of the property. Further study will be needed to <br /> . resolve this difference. <br /> 3. There does not appear to be a significant reduction in levels <br /> of contamination measured to date in the four wells, although <br /> there are considerable variations between sampling periods <br /> 4. The rather significant changes in water table depths may be a <br /> factor in the variations in levels of contamination observed in <br /> the wells. We do not have sufficient data on seasonal changes in <br /> groundwater levels to be able to analyze the data in more detail. <br /> Three additional monitoring wells were recently placed on the <br /> property in order to further define the lateral extent of the <br /> groundwater plume. The results of that work have not yet been <br /> analyzed; a detailed report covering that project will be <br /> submitted as soon as all data has been received. The three new <br /> wells will be included in the next quarterly monitoring, which is <br /> due in No 7p1mber <br /> OG <br /> W . unter & Associates �5 <br /> S p mber 21, 1994 ti� <br /> WILLIAM 1 H" <br /> cc: Canteen Corp. <br /> • CVRWQCB - Beth Thayer NO em <br /> q 4F CA1-1� <br /> 2 <br />