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Report on Soil and Ground-Water Evaluation _ September 11, 1989 <br /> -Proposed ARCO Station,-Woodbridge, California=- -- AGS 39044-1 _ <br /> this-work. We understand that the former.tanks"ai the-site were removed before ARCO <br /> and Applied Geos stems' involvement-with the site. No additional infrmation re ardin - <br /> ... PP Y og_ g . <br /> the above work is available. - <br /> - SITE GEO-LOGY AND HYDROGEOLOGY <br /> The site.is underlain.by the Modesto Formation which is composed of alluvial sediments <br /> that are arkosic in composrtion and that range -in .size from gravel to sand and silt <br /> -(Marchand and Allwardt, 1977)..'-- :The Modesto Formation dips gently to the :west <br /> (California Division bf-Mines and Geology, 1966). As interpreted from the boring logs and <br /> the-: observations -made by Applied: GeoSystems, personnel _during the _recent work, the <br /> deposits at the site consist primarily of silt to-approximately 8 feet below the ground surface <br /> where sand is encountered to a depth. of approximately 18 feet underlain by a relatively- <br /> . _ -- -- -- <br /> impermeable clayey silt: _s <br /> The site is in the Eastern San Joaquin County. -Ground-Water Basin, which has a regional <br /> ground-water gradient to the.southwest (California Department of Water Resources,"1980), . <br /> The ground-water basin--has-been developed for intensive irrigation, domestic, :industrial, <br /> municipal, and stock:use _ - - <br /> A)iWAVOF GeoSystems <br />