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TABLE 3 <br /> Historical TPH-G Concentration Summary (µg/L) <br /> San Joaquin County Human Services Building Site <br />' Sample Date <br /> Well <br /> August 1991' April 1993 2nd Quarter 1993 3rd Quarter 1993 4th Quarter 1993 <br />' MW-4 520 82 96 37 TBA <br /> MW-5 ND ND ND ND TBA <br />' MW-6 ND ND ND ND TBA <br /> MW-7 1,700 ND ND ND TBA <br />' MW-8 ND 2,300 2,200 1,700 TBA <br /> 1 August 1991 data is from the Phase II Groundwater Investigation <br />' 2 TBA = To be added after future sampling events <br /> 3 J = Present below detection himt <br /> 3.0 GROUNDWATER FLOW DIRECTION <br />' Groundwater elevations in each well were measured in order to evaluate the groundwater flow <br /> direction beneath the site The measurements were collected from all five wells within a <br /> minimum amount of time at the beginning of the field effort to ensure that the measurements <br /> reflect a consistent static water level in the aquifer The groundwater elevation measurements <br /> (as shown in Table 1) were plotted on the site map and contoured (Figure 3) to show the <br />' groundwater surface morphology and the groundwater flow direction <br /> Based on an interpretation of Figure 3, groundwater beneath the site flows toward a groundwater <br />' trough which is aligned southwest-northeast across the site This flow pattern is similar to the <br /> pattern interpreted for the second quarter 1993 monitoring event except that the northeasterly <br /> flow component which was present in the second quarter appears to be absent in the third <br />' quarter <br /> 1 <br /> 1 <br /> 1 <br />' SfK1RP'('SL5)C 3RD WP <br /> 6 �« <br />