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1 <br /> 3.0 SUBSURFACE CONDITIONS <br /> ' 331 Geology <br /> ' Soil from the borings generally consisted of silt and clays from the surface to 55 to 60 feet bgs. <br /> Soil consisting primarily of silty sands or sandy silts was encountered between 60 to 80 feet. Soil <br /> encountered between approximately 80 to 85 feet bgs consisted of organic clay. Soils consisting <br /> ' of poorly graded sands were encountered from 85 feet to approximately 105 feet bgs. Soil boring <br /> logs with a detailed description of soil types are contained in Appendix A. Geologic cross <br /> sections are depicted in Figures 10 and 11. <br /> ' 3.2 Hydrogeology <br /> ' 3.2.1 First Quarter Water Level Measurements <br /> Water levels were measured in monitoring wells MWI through MWS, MW6a, MW6b, MW7a, <br /> ' ( MW7b, MW7c, MW8, MW9a, MW9b, MW9c, and EW 1 on March 16, 2004. Water levels <br /> l ranged in the shallow "A" zone from 64.17 to 65.14 feet below the tops of the well casing <br /> elevations. Water levels in the medium `B" zone wells ranged from 58.56 to 64.58 feet below <br /> the tops of well casing elevations. Water levels in the deep "C"zone wells ranged from 63.59 to <br /> 67.44 feet below the tops of well casing elevations. The water level data were used to develop <br /> groundwater elevation contour map (Figures 3, 4, and 5). Groundwater flow in the uppermost or <br /> "A" zone aquifer beneath the site was towards the northeast during the monitoring period. The <br /> l average hydraulic gradient on March 16, 2004 was calculated to be 0.0003 ft/ft or approximately <br /> 1.6 ft/mile. A summary of groundwater monitoring data is presented in Table 3. <br /> ' 3.2.2 Seconduarter Water Level Measurements <br /> s <br /> ' Water level measurements were collected from monitoring wells MWI through MW5, MW6a, <br /> MW6b, MW6c, MW7a, MW7b, MW7c, MWS, MW9a, MW9b, MW9c, MW10a, MW10b, <br /> MWI Oc, and EWI on June 3, 2004. Water levels ranged in the shallow "A" zone from 65.04 to <br /> ' L 65.84 feet below the tops of the well casing elevations. Water levels in the medium "B" zone <br /> wells ranged from 65.43 to 66.65 feet below the tops of well casing elevations. Water levels in <br /> the deep "C"zone wells ranged from 64.92 to 66.90 feet below the tops of well casing elevations. <br /> ' The water level data were used to develop the groundwater elevation contour maps (Figures 6, 7, <br /> and 8). Groundwater flow in the uppermost or"A" zone aquifer beneath the site was towards the <br /> southeast during the monitoring period. The average hydraulic gradient on June 3, 2004 was <br /> calculated to be 0.001 ft/ft or approximately 5 ft/mile. A summary of groundwater monitoring <br /> data is presented in Table 3. <br /> t' <br /> �L <br /> SAEnviromenta1126823-JamarVeports\sum.doc 5 <br />