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1 <br /> t <br /> PROPOSED PROTOCOL FOR CONDUCT OF SOIL BORINGS <br /> AND/OR INSTALLATION OF MONITORING WELLS AT <br /> CHEVRON FACILITY 61001671 (FUEL TERMINAL) <br /> BANTA, SAN JOAQUIN COUNTY, CALIFORNIA <br /> EA Engineering,,. Science and Technology, Inc. ( EA) has been <br /> retained by Chevron U.S.A. Inc. to Investigate potential soil <br /> and/or ground-water contamination under Chevron Fuel Terminal <br /> ( 61001671 ) , at Banta, San Joaquin County, California. To deter- <br /> mine the extent land level of potential ground-water contami- <br /> nation, the drilling of four soil, borings and the completion of <br /> monitoring wellsi. is proposed. The proposed soil boring/well <br /> locations are shown in Figure 1 . <br /> i <br /> Soil borings and%or monitoring wells will be drilled in accor- <br /> dance with the general yuldelines given by the California State <br /> Water Resources Control Board in "California Underground Storage <br /> f <br /> Tank Regulations F' and more specific guidelines of San Joaquin <br /> County. <br /> All holes will be drilled with a hollow-stern auger to depths of <br /> f <br /> approximately 30 feet, which is 20 feet below the lowest <br /> anticipatedraurid-w <br /> 9 ater level . However, wells will not extend <br /> If through laterally! extensive clay layers that lie below the water <br /> table: if there is at least 5 feet, of competent clay below the <br /> water table, the Wells will be terminated 1 to 2 feet into this <br /> clay. I <br /> The borings will be completed as monitoring wells according to <br /> Section 2647 of "California Underground Storage Tank Regulations" ' <br /> ( Figure 2 ) . Factory-perforated PvC screen (typically 4-inch <br /> diameter, 0 . 020-inch slot, Schedule 40 ) will be installed from <br /> the bottom to 10 feet above the highest anticipated ground-water <br /> level; blank PVC casing will be installed from the top of the <br /> screen to ground surface. The bottom end of the casing in each <br /> well will be fitted with threaded end plug or slip cap. The <br /> annular space botween tho borehole and the casing will be filled <br /> will, filter pacx dt clean, sand of an appropriate size. The i <br /> c12/10118 . 04 1 <br /> I! <br /> I <br /> 1 <br />