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Ms.Tammy Hodge CAMBRIA <br /> November 1, 1996 <br /> Ground Water Depth: Ground water at the site has ranged from about 8 to 12 ft deep. More than four years <br /> of ground water data indicates only slight fluctuation in the depth to water. <br /> Hydrocarbon Plume Is Stable or Decreasing: As discussed previously, the hydrocarbon plume is defined <br /> and decreasing. Hydrocarbons are currently detected in only one well,MWA at low, stable concentrations. <br /> No hydrocarbons have ever been detected in the off site down gradient monitoring wells MW-4 and MW-5. <br /> Drinking Water Wells or Other Sensitive Receptors: Although no information is available on the presence <br /> or construction of area wells, shallow ground water in the Tracy area is not potable due to it's high salinity and <br /> dissolved solids content. Therefore, it is very unlikely that there are any shallow wells in the area.. <br /> Preferential Pathways: No significant lithologic preferential flow pathways have been identified at the site. <br /> Since ground water averages about 8 to 10 ft deep, it is unlikely that the nearby shallow sewers could act as <br /> preferential pathways. <br /> The Site Presents No Significant Risk to Human Health: Since there are no significant exposure pathways, <br /> the site presents no apparent risk to human health. <br /> The Site Presents No Significant Risk to lite Environment: There are no surface water bodies near the site, <br /> and since only low levels of hydrocarbons have been detected at the site, there is no risk or threat to the <br /> beneficial uses of regional ground water. <br /> MONITORING SCHEDULE <br /> Based on these characteristics, this is a low-risk ground water site and is a candidate for closure. We <br /> recommend case closure. Until case closure is approved, we recommend the following ground water <br /> monitoring schedule: <br /> i <br /> 8 <br />