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W _ <br /> r <br /> 171-90 <br /> 3. Ths site was formerly used as a gasoline service station, now abandoned. The <br /> pump islands, cashier booth and canopy remain on site, but the fuel pumps <br /> have been removed (FIGURE 3). <br /> 4. The, surface material is concrete and asphalt, except for the planter areas. <br /> Tht: asphalt is in poor condition and drains to the north. <br /> F� 5 Aasphalt pati storages the area of the three former 10,000 gallon <br /> underground <br /> i <br /> s. <br /> � r <br /> SUBSURFACE LITHOLOGY <br /> i + Ail of the monitoring well borings were drilled to a depth of 25 feet below the ground <br /> x• surface. Below a depth of 14-15.5 feet below ground surface, the soil consists of two <br /> s <br /> overlapping medium dense clay to silty clay, and sandy clay layers. A layer of medium <br /> density, very fine to coarse sand overlies the clays to a depth of 7 to 10 feet below the <br /> � e <br /> surface. A continuous, loose, silty sand layer, approximately 5 !0 10 feet thick, exists <br /> t- at the surface. The soil profile is graphically shown on Figure 4. <br /> i <br /> The following general descriptions and soil groups, as classified in accordance with the <br /> Unified Soil Classification System (APPENDIX A) are as follows: <br /> E-..� <br /> t�AcrriDliotl <br /> Mrs <br /> SM BIIv Sand moderate yOaowish brown; fine and very fine sand; <br /> E silty; slightly cohesive; slightly micaceous; poorly graded; <br /> e medium density. <br /> ! ' SW BApd.: moderate yellowish brown; very fine to medium sand; no <br /> cohesion; moist; well graded; subrounded quartz grains; medium <br /> density. <br /> CH gpdy�a light olive gray; fine to medium sand; very cohesive; <br /> slightly micaceous; very moist to saturated; dark orange to dark <br /> gray mottling; stiff. <br /> i <br /> 4 <br />