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ME <br /> � t''�` iri4..m� ��a«+��"'.7�.; w:.. :s s #e..r✓.�._:... �..y... - <br /> i. <br />=y`R- <br /> f <br /> 1.0 SITE DESCRIPTION <br /> The Stockton Scavenger operations facility is located on CAP(Fig-1) . <br /> mately 4.5 acres of land ua ed a proximatelyvy Drive ionetocktont quarter mile west <br /> Geographically, it is situated app in township 1ti- <br /> of the intersection of Interstate 5 and Charter Way <br /> range 6E. eSecrformed atmthessiteeisoinshown on responseutosleaksgfromltwo unps. <br /> The work p <br /> the area. SAogeneralizedtrage tankswsite base maphich have nisxshowneinaFigureo2ewhichm <br /> the a <br /> also shows the former locations of the tanks. txucksnand theaoped <br /> hydraulic ail - <br /> and diesel fuel used for fueling <br /> ation of equipment. The capacities of the hydraulic <br /> cd l000 lOil tan is <br /> as <br /> 500 gallons while the <br /> iwaslreleasedfuel nfromleither tank. A detailed <br /> un%nown how much liquidt of <br /> Sol contaminationfoundinssamplesinitiated <br /> taken fromthe walls eoftthe lexcavation. <br /> rosamples monitoring wells at the site is re- <br /> The installation of g of the water table to the base of <br /> quired due to the close proximity <br /> the excavation. <br /> 2.o TOPOGRAPHY/GEOLOGY vel <br /> The site is situated at approximately 10the ft aboveoaque sea l eRivern IThe <br /> which slopes gently to t <br /> he west river lies approximately one and a half miles away and drains nTh <br /> orth- <br /> westward towards the central axis °f alluvial ingnaturelleand•consists <br /> geology of the area is predominantly <br /> of gravels, sands, silts, and clays. The alluvium has <br /> uentl derived <br /> gen-- <br /> r from the western slope of the Sierra Nevada and conseq Y <br /> tly to the west. <br /> Locally, the stratigraphy is predominantly brown, moderately plastic, <br /> silty clays at shallow depths, ground surface to 14 ft, which grade <br /> ' into gray, plastic, organic clays inivery fine grained <br /> these dtwo units <br /> fairly uniform layer of coarse grained <br /> at approximately 3.4 - 17 ft. depth. Classifications of soil samples <br /> rformedi <br /> ed Soil <br /> taken at the site was PeBorings <br /> fpr°ecdance l <br /> achlogareth UnotzincludedCins- <br /> sification System (USCS) . HOr�ng on request. <br /> this report but can be made available up <br /> 3 - j HYDROGEOLOGY. <br /> The alluvial sediments in the area comprise the small pocketsallow aofrring <br /> semi <br /> zone which is considered <br /> be un <br /> b <br /> confined to confined byre conditions have <br /> havebeen noted in reports <br /> pertaining to the Stockton area. Groundwater was encountered a <br /> _...._approximately 30 ft. depth he ..hollowxact depth <br /> stem augersunknown <br /> tenddue <br /> to sealoff the-- - -- .. process--used <br /> type of drilling- <br /> The water--bearing- sea - ....... . ........ _.._.._. - --.... . <br /> the formation for short periods of time) - <br />