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r <br /> Ceotogica1 Tec/Mics Inn' <br /> 2741 River Road <br /> Modesto,California 95351 <br /> (209)538-6424/Fax#538-5852 <br /> r <br />' REPORT <br /> Groundwater Monitoring <br /> 4" Quarter 2001 <br /> UST Site <br /> r <br /> Ted Peters Trucking Co., Inc. <br /> 1985 Yosemite Ave. <br /> Manteca, CA 95336 <br /> Project No 640 2 <br /> February 5, 2002 <br /> EXECUTIVE SUMMARY <br />' This report summarizes the 40' Quarter 2001 round of groundwater monitoring and testing <br /> that took place on November 7, 2001 Laboratory analyses indicate that BTEX and TPH-G <br /> are not present in the ground water samples collected from MW-1, MW-2 or MW-3 In <br /> addition, none of the oxygenated fuel compounds were detected in any of the wells <br /> The groundwater level has decreased 0 07 feet since the August 1, 2001 monitoring event <br /> Groundwater gradient calculations show that groundwater flow was N44°W, which is <br /> consistent with historical gradients recorded for the UST portion of the site <br /> 1 <br /> 1.0 GROUNDWATER MONITORING <br /> 1.1 Hydi ogeology of Site <br />' A site-specific groundwater gradient and bearing was calculated from the depth to water <br /> measurements taken during the groundwater monitoring The gradient was 0 001 ft/ft <br /> ' flowing N44°W The average elevation of groundwater under the site was 13 28 feet above <br /> mean sea level, which is a decrease of 0 07 feet since the August 1, 2001 event Depths to <br /> water ranged from 10 18 to 10 65 feet bgs <br /> r <br />