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1*1 3.0 GROUND WATER MONITORING IT CORPORATION On May 30, and June 24, 1985, all the wells reaching ground water on the site were surveyed and monitored. Monitoring consisted of measured depth to ground water and product thickness if product was present. A description of the procedure is given in Attachment 2. Monitoring results are shown in Table 3.1. No free product was observed in the water samples from any of the wells. A slight sheen and faint petroleum odor was noted in MW --7. 3.1 GROUND WATER GRADIENT Monitoring data collected from the ground water monitoring wells on May 30 and June 24, 1985 indicate a piezometric elevation difference of 0.14 and 0.22 feet, respectively. With such a slight difference, an accurate flow direction could not be determined. 3.2 WELLS LOCATED NEAR SITE Figure 3.1 shows the location of irrigation and domestic wells in the vicinity of the station. The Data presented are from Well Drillers Reports submitted to the California Department of Water Resources (DWR). Table 3.2, which accompanies Figure 3.1, shows information regarding each well plotted. The well number presented is the number on the Water Well Drillers report. The approximate elevation of the well is presented next and, in most cases, is simply an interpreted elevation from the topographic map for the area. The approximate distance of the well from the station is indicated. The next column indicates whether the well is for domestic or irrigation purposes. The depth of the well and the depth of the surface seal is presented followed by the screen interval. The surface seal is the cement grout that is intended to protect the well from contamination migrating down the well bore from - -- ----- the --land surface.- The -screen -interval -is the actual -length -of -well that- - is open to accept water from the ground. Finally, an indication of whe- ther a well is active or inactive is made along with the year the well 4 was drilled. '*' 5