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' File No. 94342-QM94 Page 8 <br /> 1 <br />' 4 .0 CONCLUSIONS AND RECOMMENDATIONS <br /> No floating products or sheen were observed by us during sampling <br />' of the groundwater. The results of the recent laboratory analysis 1 <br /> of the groundwater revealed elevated amount of contamination in <br /> monitoring wells MW-1 and MW-2 . Comparison of the recent <br />' laboratory result with the previous results of the groundwater <br /> indicated that the concentration of total petroleum hydrocarbon as <br /> gasoline and diesel has been reduced in wells MW-1 and MW-2 . The <br />' results also revealed that the amount of Benzene slightly increased <br /> in monitoring well MW-2 .in respect to the last results. The <br /> groundwater level monitoring performed by our firm based on the <br /> monthly check, indicated groundwater flow in the north, and <br />' northeast direction. <br /> To further define the contamination plume at the subject site, we <br /> are proposing to install three additional monitoring wells.✓These <br /> wells will be installed at the locations shown in Figure 3 of this <br /> report. Monitoring well MW-4 will be installed north of the <br /> existing monitoring well MW-1 in close proximity to the property <br />' line, depending on the location of the existing underground <br /> utility lines at the site. Monitoring well MW-5 will be installed <br /> northeast of the existing monitoring well MW-2 on the adjacent <br />' property(if permission is obtained) Monitoring well MW-5 will be <br /> installed on the west side of the existing pump islands and close <br /> to the western property line. Soil samples will be collected from <br />' these borings at five foot intervals and up to the groundwater <br /> level. The borings will then be converted to monitoring wells. <br /> Soil and groundwater sampling will be conducted in accordance to <br /> the San Joaquin County, Public Health Department and Regional Water <br />' Quality Control Board. The subDect work is scheduled to be <br /> performed in July 1994 , pending the approval of our client, and <br /> obtaining the appropriate permits for the monitoring wells, and the <br />' approval of the property owner of the adDacent property. <br /> The monthly groundwater level measurement and quarterly groundwater <br /> sampling shall continue at the site. The next quarterly <br /> groundwater sampling is scheduled for July 1994 . <br /> 1 <br /> 1 <br />' ADVANCE SOIL TECHNOLOGY, INC <br />