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• <br /> majority of the borings drilled except for TR-20 and TR-21 located southeast of the 541 Site and <br /> downgradient of the former Wheel Country/Service Station(Appendix B) <br /> ' 5.2.2 Deeper Soil Sample Results <br /> A total of 5 deeper soil samples was collected between 7 5— 10 5 feet bgs and analyzed <br /> (Table 3) Two deeper soil samples were collected at TR-7 and TR-14 on the 541 Site and 3 <br /> samples were collected in offsite borings TR-17, TR-18, and TR-24 All of the deeper soil <br /> samples were collected below the groundwater The compounds detected included TPH-gasoline <br /> (340 to 1,800 ppm), TPH-diesel (22 to 320 ppm), and BTEX (<0 13 to 67 4 ppm) These values <br /> were comparable and of similar magnitude to the previous investigation results by AGE in 2000 <br /> 53 Groundwater Grab Analytical Results <br /> Groundwater grab samples were collected from the shallow and deeper groundwater units The <br /> results are described below and provided in Table 4 <br /> 5.3.1 Shallow Groundwater Grab Results <br /> ' The isoconcentration contour maps for TPH-jet fuel, gasoline, and diesel are provided on <br /> Figures 8, 9, and 10, respectively A jet fuel, gasoline, and diesel groundwater plume extends <br /> ' north from West Grant Line Road across the former Chevron Station and Tracy Express Wash& <br /> Lube properties to at least Cardoza Lane (approximately 600 feet) The groundwater plume <br /> ' extends to the east and underlies the majority of the 541 Site <br /> The highest concentrations of jet fuel, gasoline, and diesel were found on the Tracy Express <br /> Wash & Lube property located west and offsite of the 541 Site TPH het fuel was detected in the <br /> majority of shallow groundwater samples at concentrations ranging from <50 to 390,000 ppb <br /> TPH-gasoline was detected at <50 to 900,000 ppb Concentrations of TPH-diesel ranged from <br /> <50 to 340,000 ppb TPH-motor oil was detected from<300 to 1,500 ppb and was detected in <br /> . only two samples The laboratory instrument detection limit for TPH-motor oil was significantly <br /> Field Investigation Report 14 S December 2003 <br /> ' TREADWELL&ROLLO,INC <br />