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9038OB-SS4 CON-29 <br /> examined. Data from six additional private wells sampled are not included <br /> in this characterization because they are located generally downgradient of <br /> the Depot. The location of private wells sampled is shown on Figure 2.6-2, <br /> with the owner' s name and address summarized in Table 2.6-1. The results <br /> of the private well sampling for metals are included in Table 4.0-23 and <br /> the purgeable halocarbons (EPA 601) in Table 4.0-22. The nine private <br /> wells used for the characterization of natural groundwater are numbered 2, <br /> 3, 4, 5, 8, 9, 10, 14, and 15. <br /> 4.3.2.2.3 Of the 15 private-wells sampled,- none of the .well depths or <br /> screened_depths 'have been determined. For this comparison, however, it has <br /> been assumed that they are completed in the Upper Tulare HSU. Of the <br /> organics and metals analyzed from the nine wells, all but seven metals were <br /> below the analytical detection limits. The seven metals with results above <br /> detection limits are aluminum, calcium, chromium, iron, magnesium, sodium, <br /> and zinc. The range, mean concentration and number of samples above <br /> detection levels are summarized in Table 4.3-1. The sample from Well 5 <br /> (John Erb domestic well ) was slightly above the California DHS MCL of 0.05 <br /> mg/1 for chromium, with a concentration of 0.056 milligrams per liter <br /> (mg/1) . All other results were below the MCLS for the organic and <br /> inorganic parameters tested, with all results for the purgeable halocarbons <br /> M in these nine wells being below detection limits. These results indicate <br /> that the natural background water quality in the vicinity of the Depot does <br /> not regularly exceed the drinking water limits or contain detectable <br /> volatile organic chemicals. It should be noted that the samples from these <br /> wells were collected from pressure tanks or discharges at the well head and <br /> thus the analytical results may be influenced by pump or plumbing material <br /> and may not be representative of natural groundwater quality. Other <br /> parameters (nitrate, fluoride, salinity, and boron) which were reportedly <br /> high for the natural water quality (Hotchkiss and Balding 1971) were not <br /> tested as a part of the private wells sampling. <br /> 4-161 <br />