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' Fourth Quarter/Annual <br /> 2008 Groundwater <br /> ' ARCADIS Monitoring Report <br /> Chevron Bulk Fuel Terminal <br /> 100-1621 <br /> ' 22888 Kasson Road <br /> Banta,California <br /> Introduction <br /> ' On behalf of Chevron Environmental Management Company(Chevron),ARCADIS has <br /> prepared this Fourth Quarter/Annual 2008 Groundwater Monitoring Report to <br /> ' document the results of groundwater monitoring and sampling at Chevron Bulk Fuel <br /> Terminal 100-1621 located at 22888 Kasson Road in Banta, California.This report was <br /> prepared in accordance with the California Regional Water Quality Control Board— <br /> ' Central Valley Region(RWQCB)Monitoring and Reporting Program(MRP)Order No. <br /> R5-2007-0829 and Cleanup and Abatement Order(CAO)No. R5-2002-0718. <br /> ' Site Description and Background <br /> The site is located approximately 5 miles east of Tracy,in the agricultural community of <br /> ' Banta, California(Figure 1).The active fuel terminal has been in operation since 1966, <br /> and consists of nine aboveground fuel storage tanks(ASTs),tank-truck loading racks, <br /> above and below-ground piping, a storage building and an office with service bay <br /> ' (Figure 2).The ASTs are enclosed by a 3-foot high secondary containment berm.A <br /> portion of this berm forms a spill containment area located in the northern portion of the <br /> terminal. Fuel lines from the fuel storage tanks run above ground within the secondary <br /> ' containment area.The fuel lines run below ground between the secondary <br /> containment area and the tank-truck loading racks under the paved portion of the <br /> terminal. Retention ponds located on the north side of the terminal are used to store <br /> storm water as needed. <br /> The San Joaquin Groundwater Basin underlies the site.The principal source of <br /> groundwater in the area is the Tulare formation.The Tulare formation is separated into <br /> tthree zones,the Upper Tulare Aquifer,the Corcoran Clay Layer and the Lower Tulare <br /> Aquifer(USGS, 1998a. Environmental Setting of the San Joaquin-Tulare Basins, <br /> California). <br /> ' The Upper Tulare Aquifer lies from approximately 5 to 200 feet below ground surface <br /> (bgs).The Corcoran Clay, consisting of low permeability silty diatomaceous clay, is <br /> ' generally encountered at 200 feet bgs, and is approximately 100 feet thick.The <br /> confined Lower Tulare Aquifer lies below the Corcoran Clay. Based on regional <br /> geology,there appears to be no perched aquifers under the site(USGS, 1998a. <br />' Environmental Setting of the San Joaquin-Tulare Basins,California). <br /> Site assessment activities completed to date indicate that soils underlying the site <br />' consist primarily of sandy silt for the top 5 feet, silt and sandy silt from approximately 5 <br /> 1 of 17 <br />