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t, <br /> y.. i�, =B'4�a Tr. ' Y .k <br /> W �� `_ v?.'.� �L• <br /> tl &t <br /> a NO <br /> ,wq , <br /> Worst Plan, Excavation and Soil Sampling April 24, 1.989 <br /> ARCO Service Station No. 760, Lodi, California 38048-2W <br /> biphenyls (PCB) and halogenated volatile organics were not <br /> detected by the analytical laboratory in the soil sample. <br /> SITE GEOLOGY AND HYDROGEOLOGY <br /> "7 The site is underlain by the Modesto Formation, which is composed <br /> of alluvial sediments that are arkosic in composition and that <br /> range in size from gravel to sand and silt (Marchand and <br /> } Allwardt, 1977) . The Modesto Formation dips gently to the west <br /> (Ca'-ifornia Division of Mines and Geology, 1966) . <br /> The site is located in the Eastern San Joaquin county Ground- <br /> water Basin, which has a regional ground-water gradient to the <br /> southwest (California Department of Water Resources, 1980) . The <br /> ground-water basin has been developed for intensive irrigation, <br /> domestic, industrial, municipal, and stock use. <br /> i <br /> The local',surface drainage includes the Mokelumne River and the <br /> South Main Canal. The Mokelumne River drains to the west <br /> approximately 1 mile north of the City of nodi. The South Main <br /> Canal flows to the south approximately 3 miles west of the site. <br /> 4� <br /> 4 <br /> �- A,ai�si�d �eo�ysterns <br />