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' QUARTERLY MONITORING REPORT <br /> THIRD QUARTER 1992 <br />' T BEACON STATION #494 <br /> 2185 EAST FREMONT STREET <br />' STOCKTON, CALIFORNIA <br /> AMV NO. ULT05.02 <br /> t <br /> 1.0 INTRODUCTION <br /> Acton • Mickelson • van Dam, Inc (AMV), has been authorized by Ultramar Inc. (Ultramar), <br />' to continue environmental monitoring and remediation at Beacon Station #494, located at 2185 <br /> East Fremont Street, Stockton, California (Figures 1 and 2) This report presents results of <br /> monitonng activities performed during the third quarter of 1992, including water level and <br />' liquid-phase hydrocarbon (LPH) thickness measurements and quarterly ground water sampling <br />' 2.0 WATER LEVEL AND LPH THICKNESS MONITORING <br />' Depth to ground water was measured in ground water monitoring wells MW-1, MW-2, and <br /> MW-3 on July 15, 1992 Measurable layers of LPH were not detected in any monitoring well <br /> during the quarter Ground water level measurements are compiled in Table 1 Methods used <br />' to measure water levels and LPH thickness are described in Appendix A <br /> Depth to ground water ranged from 74 79 (MW-3) to 75 53 (MW-2) feet below grade on <br />' July 15, 1992 The inferred direction of ground water flow is toward the northwest (Figure 3) <br /> Past depth to ground water measurements have indicated a direction of ground water flow toward <br />' the southeast. The gradient of ground water flow on July 15, 1992, was approximately 0 001 <br /> foot per foot <br />' 3.0 GROUND WATER QUALITY <br />' All monitoring wells at the site were purged using a submersible pump and sampled using the <br /> methods described in Appendix A Field observations and sampling documentation are contained <br />' in Appendix B. Ground water samples were submitted for laboratory analysis of benzene, <br /> toluene, ethylbenzene, xylenes (BTEX), and total petroleum hydrocarbons as gasoline (TPHg) <br /> The sample collected from monitoring well MW-2 was analyzed for halogenated volatile <br />' organics The sampling and analytical results are included in Table 2 Copies of certified <br /> analytical reports are contained in Appendix C <br /> i <br />