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1 <br />' Project Quarterly Update Report December 10, 1992 <br /> . Southland Store No 20680, 9110 Thornton Road, Stockton, CA 2 <br /> t21 Groundwater Monitoring <br />' The DTW in the groundwater monitoring wells was monitored on September 24, 1992 The <br /> monitoring data are presented in Table 1 Groundwater in the monitoring wells was allowed to <br />' equilibrate to the static level before monitoring water levels The DTW and depth to separate-phase <br /> hydrocarbons were measured to the nearest 0 01 foot from the top of the well casing, using an <br /> INTERFACE PROBETm Well Monitoring System Groundwater monitoring was performed according <br />' to Groundwater Technology's Standard Operating Procedures (SOPs) Copes of the SOPs are <br /> included in Appendix A <br /> Analysis of the groundwater monitoring data indicates that groundwater elevations in the monitoring <br />' wells at the site have decreased by approximately 2 feet since June 29, 1992 As of September 24, <br /> 1992, the average groundwater elevation at the site was 37 23 feet below mean sea level (MSL), and <br />' the average DTW at the site was 49 25 feet below grade <br /> Since the groundwater levels at the site were first monitored in May 1986, the local groundwater <br /> elevation has fluctuated seasonally and declined steadily Groundwater monitoring wells MW-2 <br /> through MW-5, MW-9, MW-10, PW-1, and PW-2 could not be monitored on September 24, 1992, <br /> Ibecause they were dry Monitoring wells MW-6 and MW-12 are no longer in service and, at <br /> Southland's direction, monitoring wells MW-11 and MW-14 are no longer monitored or sampled <br /> Former pumping well PW-3 could not be monitored because an automobile was blocking well <br /> access The well completion data and current status of the monitoring wells at the site are <br /> Isummarized in Table 2 <br /> A potentiometnc surface map (Figure 3) was prepared using monitoring data collected on <br /> September 24, 1992 Figure 3 shows a groundwater flow direction to the northeast with a gradient <br /> of approximately 0 003 foot per foot During this reporting period, no separate-phase hydrocarbons <br /> were detected in the monitoring or former pumping wells <br /> i <br /> R1211A1 RH <br /> �J_kW1 GROUNDWATER <br /> TECHNOLOGY, INC <br />