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and continued to the end of the boring (60 feet depth) . This <br /> sand zone also represents the first water bearing zone <br /> encountered under the site. <br /> t= <br /> Depth to groundwater was recorded at between 47 and 50 feet <br /> below grade. A summary of the groundwater monitoring at the site <br /> is presented in table 1. Based on information from the <br /> groundwater monitorings and from other project sites in the near <br /> �. vicinity the groundwater gradient underlying this site is <br /> relatively flat less than .5 percent and is likely toward the <br /> ' E southwest. All groundwater in the Stockton area is considered to <br /> F <br /> be a potential drinking water source and is treated as such. <br /> TABLE 1 <br /> GROUMNATRR MONITORING SUMMARY <br /> ` Date Well I.D. WellheadDepthElevation Comments <br /> . .Elevation to Water Water <br /> (ft) (ft) (ft) <br /> 11/13/86 MWI 48.9 Measurements <br /> MW2 47.84 taken prior <br /> +� to surveying <br /> well eleva- <br /> tions. <br /> leva tions. <br /> i' 12/02/86 MWI 100.20 . 47.47 52.73 <br /> MW2 100.36 <br /> MW3 100.00 47.26 52.74- <br /> ...... <br /> *Arbitrary Datum i� <br /> SUBSURFACE CONDITIONS <br /> = -During .the. drilling. of monitoring well 3 moderate product <br /> odors were first noted at 9 feet below the surface. These odors <br /> increased to strong odors by 14 feet then: decreased to slight o . <br /> ' odors -by 20 feet below the. surface. Moderate odors were noted at <br /> x•. D <br /> z ' <br /> { <br /> 3, <br />