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GE0LOGY <br />' -rhe site and all nearby terrain erre underlain by non marine, <br /> fine-grainf-d sediments which are tentatively a,�signed to the <br />' ModeF3to Formation of Ple `istocenF_ age L (USGS Bulletin 1470 <br /> -IY'I�V-I&- I' anj fi I wort t , I S�!-.I / AI t ouPh tEi'� Lli_'dr. <br />' composed of coarser-grained material such as sands and gravels <br /> it is reasonable, on the basis of stratigraphic position, to <br />' <br /> consider these finer-grained sediments to be the distal portion <br /> of the large alluvial fans which make up the Modesto <br /> The materials penetrated in our borings are chiefly clay, silty <br /> clay and clayey silt Sandy strata, although present, are <br />' relatively minor and are silty or clayey and fine--grained <br /> Bedding is absent or nondisti.nct but appears to be essentially <br />' horizontal Owing to a Moderate to high silt and/or fine- <br /> grained sand content, the clays are not highly plastic <br /> Permeability of the clays and silts is low whereas the sands <br /> exhibit somewhat higher permeability <br /> The Modesto Formation is known to be underlain by older <br /> Pleistocene and Tertiary strata which in turn rest on <br /> crystalline basement However, these formations are of no <br /> significance to this present study because of their depth <br />' No faulting or fracturing is evident on or near this site. <br /> RECZN FIELD WORK <br />' Between March 30th and April 2nd, we drilled three additional <br /> wells at this site The wells were drilled to a depth of 65 <br /> feet and 2 inch Schedule 40 PVC slotted (0 02) casing was placed <br /> from the well bottom upward 20 to 21 feet. The remaining casing <br /> was 2" blank schedule 40 PVC and was placed to the surface <br /> Number 3 sand was placed opposite the slotted section and about <br /> 3 <br />