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' Union Ice Company <br /> .1310 West WeherAvenue,Stockton, California July 12, 1994 <br /> Phase IVRemediahon Report of Findings Page• 4 <br />' The samples were also carefully poured from the bailer into half-gallon plastic <br /> containers and clean glass vials with Teflon-lined screw caps provided by the <br />' laboratory Care was taken to ensure that no air space existed in the vials by inverting <br /> to check for bubbles and re-sampling if necessary The samples were analyzed or <br /> extracted within 14 days according to their EPA methods <br /> fWater samples were analyzed using EPA method 602 for BTX&E compounds, EPA <br /> method 503 0/LLJFT for gasoline range hydrocarbons and EPA method 3 510/LLJFT <br />' for diesel range hydrocarbons The minimum detection limits used for each analyte <br /> were 3 0 ug/l for benzene toluene, and ethyl benzene, 6 0 ug/1 for xylenes and 0 5 <br /> mg/l for gasoline and diesel <br /> 4.0 Soil Conditions <br />' The stratigraphy of the site is characterized as interbedded clay/silt units with sand/ <br /> gravel ;ruts The uppermost clay/silt is a red, brown clay to silty clay (CH - CL - MIL), <br /> which was named Clay A It is found from surface to a depth of about 15 to 17 feet <br /> At seven to 10 feet in depth, the color of this unit changes from predominantly brown to <br /> predominantly bluish-gray This is indicative of a historically high water table at the <br />' site The gray color indicates reducing conditions, while the brown color indicates <br /> oxidizing conditions The clay unit continues to a depth of 15 to 17 feet Local <br /> carbonaceous fragments are dispersed throughout this unit The lithology of Clay A is <br />' typical of bacicswamp 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 arut This sand, which is named Sand 1, is classified as a poorly <br /> sorted to well sorted sand to silty/clayey sand (SP - SW - SM/SC), due to it's varying <br />' grain size This type of lithology is typical of overbank or waning flood deposits of <br /> large river systems <br /> Sand 1 is underlain by Clay B, which is a thick, fairly uniform blue-gray clay (CL - CM <br /> This clay is 15 to 23 feet thick where explored It is a stiff clay, which contains rare <br /> coarser grained sediments It is a typical overbank to back swamp deposit of a large <br /> river system <br /> I Clay B is underlain by Sand 2, which is a blue-gray, fine to medium-grained, micaceous <br /> sand The full thickness of this sand is not known This type of sand is a typical river <br /> channel deposit deposited in scour fills and in the lower flow regime portions of large <br /> river systems Sand 2 was penetrated in only two (2) wells on the property (MW-4D <br /> and MW-3 S), and it is probably continuous over the entire site <br />