Laserfiche WebLink
' toward the north Silty gravel and medium to coarse grained poorly graded sand deposits were <br /> ' encountered in borings TR-7 and TR-14 generally below 15 to 17 feet bgs <br /> Shallow groundwater was encountered at depths ranging from approximately 5 to 9 feet bgs <br /> ' (Table 2) Some of the water levels on Table 2 were not stabilized prior to measurement <br /> Generally, two water-beanng units were encountered 1) a shallow groundwater unit generally in <br /> the upper 12 feet within the silty and clayey sand layers, and 2) a deeper groundwater unit <br /> generally below 15 to 17 feet bgs within the silty gravel and poorly graded sand layers (Figures 5 <br /> ' and 6) Slower recovery of groundwater was encountered in the bonngs drilled on the northern <br /> portion of the investigation area where the shallow sandier layers pinch out The deeper <br /> groundwater unit produced significantly more water than the shallower unit <br /> 1 52 Soil Analytical Results <br /> lie The shallow and deeper soil samples results are discussed in the following sections and <br /> summarized on Table 3 The soil samples were not tested for TPH-let fuel <br /> 5 2.1 Shallow Soil Sample Results <br /> ' Fifteen shallow soil samples were collected on the 541 Site from depths of 3 5 to 6 feet bgs <br /> between the fill and the top of groundwater The shallow soil sample results are shown on <br /> ' Figure 7 Due to the limited available sampling interval, some of the shallow soil samples were <br /> unavoidably taken within the contaminated groundwater capillary fringe <br /> TPH-gasoline was not detected above the reporting limit in the shallow soil TPH-diesel ranged <br /> ' from <0 99 to 48 ppm and TPH-motor oil ranged from <5 0 to 170 ppm The highest values <br /> were detected at TR-9 (TPH-diesel at 59 ppm and TPH-motor oil at 350 ppm) for the sample <br /> ianalyzed without silica gel cleanup This sample along with several other shallow soil samples <br /> were logged as moist and are likely influenced by the groundwater capillary fringe MTBE and <br /> iBTEX were not detected above the reporting limits, with the exception of TR-8 that had a total <br /> xylene value of 0 0091 ppm Hydrocarbon odors were detected below the groundwater in the <br /> Field Investigation Report 13 S December 2003 <br /> ' TREADWELL&ROLLO,INC <br />