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Site Description <br /> the basement complex of the Province have not been completely defined,but i Lre believed to be <br /> metamorphic and igneous in origin(AGE, 2004). <br /> Boring logs from a number of soil borings on the site show the soil profile to consist roughly of a 50-50 <br /> mixture of coarse-grained(silty sand to poorly graded sand)and fine-grained clay to sandy silt)soils <br /> from the surface to as much as 50 feet below ground surface (bgs). The soil t,rpes vary laterally and <br /> vertically and do not exhibit significant lateral continuity. <br /> The Modesto,Riverbank, and Turlock Lake Formations and overlying Receni alluvium are the principal <br /> sources of domestic groundwater in the 13,500-square mile San Joaquin Valk y Groundwater Basin <br /> (Basin 5-22). Groundwater is considered to be of beneficial use and is used for domestic,industrial,and <br /> commercial uses. <br /> Groundwater in the southern portion of the site is currently being monitored r volatile organic <br /> compounds(VOCs) and diesel. The latest quarterly groundwater data(URS Company America[URS, <br /> 2005b]), indicate that groundwater was encountered at depths between approi imately 49 and 52 feet Ings <br /> and was flowing toward the north-northeast. The URS report showed the his rical local groundwater <br /> flow direction generally northward,varying from west-northwest to east-sou east(URS, 2005b). <br /> The nearest surface water feature in the vicinity of the site is the Calaveras river,located approximately <br /> 3,300 feet north of the site. <br /> 2.2 Site History and Development <br /> Information on the site history was developed by AGE through their review f various reports prepared <br /> by Kleinfelder and D&M,discussions with Mr.Glen Gallup of AMMC,file reviews and interviews at <br /> the San Joaquin County Public Health Services—Environmental Health Divi ion(PHS-EHD),the <br /> Regional Water Quality Control Board(RWQCB), and review of various do uments supplied by AMMC. <br /> Draft <br /> KB61125 workplan-ESC MACTEC Engineering and Consulting, Inc. 7 <br /> September 28,2005 <br />