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9 <br /> 11110 <br /> a�a <br /> Urtion Ice Company- Weber Street <br /> Phase II-Report of Findings <br /> Page 5 <br /> HYDROGEOLOGIC SETTING <br /> The Union Ice, Weber Street site is located within the City of Stockton, in the flood <br /> plain of the San Joaquin River. The site is situated near the center of the Central Valley <br /> structural trough, a large, broad, synclinal feature that traverses Central California for <br /> several hundred miles. The site is located about two miles northwest of the Tracy- <br /> Stocktonfault Zone, froom TracyttoktOn Stocktontandsacross beyond.tThe faultCentral <br /> buriedValley nby <br /> ENEE --WSW direction <br /> Quaternary basin fill sediments and is not known to be active. <br /> The site is g The subsuby r acedeposits <br /> ofthef site has beente San in explored River (geolog- <br /> ically <br /> exp ored to a depth of 61 feet <br /> icaily recent)t) Age. <br /> Ade.. <br /> during this program. The surface of the site is essentially <br /> flat,of precipitation <br /> eaCie1tatlonlenuallyS <br /> about io the foet rint of rainhandtte receives mostly in the fall and winter`months. p <br /> mostly <br /> The stratigraphy of the site is characterized as interbeddea clayisilt units with sand/ <br /> hic relationships are shown on the Hydrogeologic Section <br /> gravel units. The stratigrapa. <br /> (Plate 2). Log/Well x 13a Detailed ]itholegividucl descriptionmonitor s of i <br /> individual Diagrms of the indi <br /> un to can be <br /> presented in App <br /> found there. <br /> The uppermost clay/sill is a red, brown clay to silty clay (CH - CL - ML), which was <br /> named Clay A; it is found from surface to a depth of about 15 to17 feet. <br /> t aseven <br /> to <br /> 10 foot depth, the color of this unit chz lges from predominantlyh water table brown to <br /> the <br /> predominantly bluish-gray This is indicative of a histori�al lyiehigwn color indicates <br /> site, the grey color indicates reducing conditions, <br /> oxidizing conditions. The clay unit continues to a depth of 15 to 17feet. <br /> et. Local s <br /> carbonaceous fragments are dispersed throughout this unit. The lithology Y <br /> typical of backswamp deposits of a large river system. <br /> This unit is underlain by a fine to coarse grained sand with local gravel units. This sand <br /> is present from about 15 to about 35 feet in depth. Thin clay and silt lenses are present <br /> in the lower half of the unit. This silty/clayey <br /> andlcwhich sand(SP Sand <br /> SMISC}Sduteto it's <br /> as a <br /> poorly sorted to well sorted sand to y Y <br /> varying grain size. This type of lithology is typical of overbank or waning flood <br /> deposits of large river systems. <br /> CL--- <br /> Sand 1 is underlain by Clay B, which is a thick, fairly uniform blue=gray clay f <br /> 23 feet thick where explored. it is a stiff clay, which contains <br /> CH). This clay is 15 to <br />