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The groundwater gradient was calculated to be 0 0029 ft/ft directed N 570 E (Figure 3). The <br /> December 1994 gradient is steeper than previously calculated The flow direction is <br /> consistent with previous monitonngs <br /> 4.2 Analytical Results of Groundwater Samples <br /> No petroleum hydrocarbons were detected in any samples collected during the December <br /> 1994 monitoring The analytical results are summarized in Table 2 The laboratory report <br /> and chain-of-custody are included in Appendix B <br /> TABLE 2 <br /> ANALYTICAL RESULTS OF WATER SAMPLES <br /> Genova Bakery <br />' 749 North Sierra Nevada Street, Stockton, California <br /> (g/L) <br /> Ethyl-1 Xylene <br /> Gasoline <br /> Sample ID TPH as Benzene Toluene benzene y <br /> MW-816-16-94 ND ND ND ND ND <br />' MW-819-16-94 ND ND ND ND ND <br /> MW-8112-12-94 ND ND ND ND ND <br /> MW-9/6-16-94 ND ND 052 ND 29 <br /> MW-9/9-16-94 IT'D ND ND ND ND <br /> MW-9/12-12-94 ND ND ISTD ND ND <br />' EW-1/6-16-94 ND ND ND ND ND <br /> EW-1/9-16-94 ND ND ND ND ND <br />' EW-1/12-12-94 ND ND ND ND ND <br /> u� parts per billion(ppb) <br /> ND Done Deterred <br />' <br /> 5.4 CONCLUSIONS & RECOMMENDATIONS <br /> 51 Hydrocarbon Impacted GroundNiater <br />' Monitoring wells MW-8 and MW-9 were installed to )Investigate the extent of hydrocarbons <br /> in groundwater after completion of vapor extraction MW-8 was installed to replace MW-1, <br /> MW-9 was installed to replace MW-3, well EW-1 is located near MW-2 In 1988, free <br /> product was present in MW-1 and MW-2 The groundwater flow direction in 1988 was <br /> north-northeast However, because of the installation and operation of the VES and the <br /> sharp drop in groundwater depths, no groundwater monitonng activities were performed <br /> between October 1988 and June 1994 <br /> C�eB�t tidd S-. J� 7 <br /> C <br /> .o..e.�y pnInx%A t <br />