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Soil Sampling Workplan <br /> Former Manufactured Gas Plant—Lodi,California <br /> associated with the former MGP; and, several areas of suspected metal debris. Additional details <br /> including a map of the identified anomalies are provided in the RI Completion report (Stantec, <br /> 2010a). <br /> 2.4 SITE HYDROGEOLOGY <br /> The City of Lodi is part of the Eastern San Joaquin Groundwater Basin. Lodi is underlain by <br /> alluvial soils deposited by runoff from surrounding mountain ranges. The alluvial layers are part of <br /> the major aquifer system that runs the length of the valley. The aquifer is recharged by the <br /> Mokelumne River which borders the City of Lodi to the north (Stantec,2008). <br /> Groundwater in the City of Lodi ranges in depth from 20 feet bgs in the northwest section of the <br /> City to 60 feet bgs in the south section of the City with a general groundwater flow direction to the <br /> south. Subsurface investigations conducted at the Site have identified first-encountered <br /> groundwater at approximately 65 feet bgs (Stantec,2010a). <br /> The Site is located within the Lodi groundwater investigation area. An investigation of <br /> tetrachloroethene (PCE)-impacted and trichloroethene (TCE)-impacted soil and groundwater has <br /> been ongoing throughout northeast and central area of the City of Lodi since 1989, when the <br /> contaminants were first detected in City's water supply wells. These contaminants were released <br /> from facilities located approximately 3,000 feet north-northwest of the Site. The Site is located <br /> within the southern end of the PCE plume, approximately 600 feet southwest of City of Lodi well <br /> MW-24A and approximately 1,000 feet north-northwest of City of Lodi well MW-21A (Stantec, <br /> 2010a). <br /> TERRA PACIFIC GROUP Page 8 October 19, 2012 <br />