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I <br /> Mohr-Fry Ranches <br />' 950 Industrial Drive, Stockton, California May 31, 1995 <br /> Phase Ill Remedial Excavation Report Page: S <br /> 10 mg/kg for motor oil and diesel Analyses were conducted by Califomia <br /> Laboratory Services, Inc , a State-certified laboratory in Rancho Cordova, <br />' California <br /> I 4.0 Soil Conditions <br /> The subsurface lithology of the Mohr-Fry Ranches site m Stockton, Cahfornia is <br /> charactenzed by interbedded inorganic micaceous silty and clayey sands, and clayey, sandy <br /> silts (Figures 7, 8 & 9, Appendix B) Covering the entire site from 1'/z to four feet below <br /> ground level is a black, clayey peat bed averagmg 21/2 feet thick Overlying the peat is a <br /> one foot thick very micaceous, silty, clayey olive-green sand <br /> Surface contamination traveled laterally m the top sand layer and did not migrate vertically <br /> through the clayey peat bed in Excavation 2 <br /> S.0 Groundwater Conditions <br /> Water levels for the March 1995 quarterly report were measured at 48 feet below ground <br /> level The deepest excavation was 23 feet below ground level Therefore, groundwater <br /> was not reached or impacted during this investigation <br /> 6.0 Geology <br /> This site, at 950 Industrial Drive, Stockton, California, is located in the northern end of <br /> California's San Joaquin Valley This area is monotonous geologically, representing primarily <br /> the alluvial flood and delta plains of the major rivers and tributaries of the region The region <br /> persisted as a lowland or shallow marine embayment during the entire Cenozoic period The <br /> surface of the Valley is composed of unconsolidated Quatemary sediments <br /> The lithologic units encountered in these borings were interbedded inorganic micaceous clayey <br /> silts and silty clays with numerous sands and silty, clayey sands of varying thicknesses This is <br /> typical of the valley fill deposits in the region <br /> 7.0 Hydrology <br /> California and Federal Governments have mandated that virtually all groundwater is beneficial <br /> Ifor current or future use unless it can be demonstrated that no beneficial use is known. <br />