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on December 17 , 1991 , and first sampled on December 26 , <br /> 1991 . Depths to groundwater were measured, elevations <br /> calculated, and groundwater gradients determined . The <br /> hydraulic gradient was initially found to be to the <br /> northeast and 0 . 006 ft/ft It has remained essentially <br /> unchanged through June of 1994 <br /> Analyses of groundwater samples acquired from the three <br /> wells since December of 1991 has revealed significant <br /> changes in the concentrations of TPH-G as shown in the <br /> following table <br /> Table 6 <br /> Concentrations of TPH-G Present in Groundwater Samples <br /> Acquired from Monitoring Wells MW-1 , MW-2 , and MW-3 <br /> December , 1991 - June, 1994 <br /> Concentrations of TPH-G <br /> Sampling MW-1 MW-2 MW-3 <br /> Date (ppb) (ppb) (ppb) <br /> ---------------------------------------------------- <br /> 12/26/91 900 12 , 000 N D <br /> 06/26/92 2 , 000 12 , 000 N D <br /> 09/28/92 2 , 100 3 , 700 N D <br /> 08/16-18/ 93 180 360 N D <br /> 12/2/93 170 100 N D <br /> 03/10-11/94 1 , 500 93 310 <br /> 06/24/94 -Dl-Y f�� (E)m <br /> N D <br /> D <br /> TPH-G Total Petroleum Hydrocarbons as Gasoline <br /> ppb. . Parts per billion <br /> N . D Not detected <br /> Interpretation of Data <br /> Between December, 1991 and September , 1992 , it appears that <br /> the concentrations of TPH-G in MW-1 were increasing whale <br /> the levels of TPH-G in MW-2 were generally decreasing <br /> Such a trend is consistent with the hydraulic gradient and <br /> direction of groundwater flow at the site , although one <br /> might expect the highest levels of TPH-G to be present in <br /> Page 10 <br />