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� � _ - <br /> r. <br /> i <br /> jS <br /> 4. RESULTS <br /> �. 4 . 1 HYDROGEOLOGY OF THE SITE <br /> i <br /> t <br /> A geologic cross-section drawn from the well logs is graphically <br /> presented for this site (Figure 7 ) . The site is located on <br /> i -• <br /> interbedded sands; silts, and clays. They are heterogeneous <br /> formations which are both laterally and vertically discontinuous <br /> fluvial deposits. The principal aquifers at the site are sand <br /> ilenses with some silt and clay, and clay lenses with sand and <br /> silt.. Each has a variable thickness ranging from 1 to 20 feet. <br /> 77 <br /> ' Groundwater gradient directions were calculated from the gauging <br /> 1 data in Table 4 using the three-point method (Billings 1972 ). <br /> the data indicate a groundwater gradient direction toward the <br /> northeast. One anomaly was recorded on 11 January 1988; those <br /> data suggested that the gradient was to the southwest. Mw2 <br /> �^r exhibited a 0:57 foot decrease in- depth- from 30 December 198.7 to <br /> 11 January 1988: This is more than a 6-inch difference in just E <br /> ( <br /> : 12. days, and this one well greatly influenced the 11 January 1988 <br /> i gradient diiection. All previous and subsequent data indicate a• <br /> 6` <br /> consistent gradient to the northeast. <br /> Ll <br /> 4 .2 ANALYTICAL RESULTS <br /> Q <br /> g 4.2. 1, Soil Sampling Results . <br /> s The results of. the most recent soil sampling indicate that only <br /> � ( minor concentrations of fuel constituents are present in the soil j <br /> section below the backfilled product and waste oil tank pits <br /> rpm <br /> (Table 6) . <br /> e25/71050/8-89/txt 15 <br /> x <br />