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Site Background Information West Clay Propci ties Page 5 of 6 intervals were observed at vaz sous depths HU4 is characterized by generally moderate to high pore ' pressures Hydrogeologic Unit 5 (HU5) extends from a rninnnum depth of 166 feet bsg to approximately 191 ' feet bsg, IIU5 is composed pi mianly of coarse-grained soils Including sand and gravelly sand Interbedded with minor silt and clayey silt and silt HU5 is characterized by generally low pore pressures, and may be classified as a flow unit HU5 was observed in borings CP r-03 and CPT-04 ' and appears to h laterally continuous beneath the site Hydrogeologic Unit 6 (HU6) was encountered In CPT-03 from approximately 191 feet bsg to ' approximately 210 feet bsg The lateral extent of HU6 Is not well defined at the site, CPT-01, CPT-02 and CPT-04 were terminated prior to encountering HU6 HU6 is composed primarily of fine-grained soils including clayey silt and silt HU6 is characterized by generally moderate to high ' pore pressures ANALYTICAL RESULTS OF GROUND WATER SAMPLES Various concentrations of target analytes were detected in each grab ground water sample collected ' from each sampling interval in soil bonngs advanced near the former UST No 3 location(CPT-01 through CPT-03) Analytes of concern were not detected above laboratory reporting limits in grab ground water samples collected from soil borings advanced near the former UST cluster area(CPT- 04 and CHB-01) Former UST No 3 Location Analytical results of CPT ground water sampling at the former UST No 3 area are as follows ' • HU-2 TPH-g and TPH-d were detected in the ground water sample collected from HU-2 at a concentration of 27,000 micrograms per liter(µg/1)and 8,800 µg/l,respectively,In sample ' CPT03/50-54 BTEX constituents were detected in the same sample at concentrations of 21 µg/1(benzene), 1,000µg/1(toluene), 1,700 lxg/l(ethylbenzene)and 6,200µg/1(total xylenes) • HU-3 TPH-g was detected in ground water samples collected from HU-3 at concentration ' ranging from 110 µg/1 to 190 µg/1 in samples CPT03/74-78 and CPT01/77-81,respectively BTEX constituents were detected at concentrations as high as 12 µg/1 benzene (CPT01/77-81), 27 µg/! toluene (CPT01/77-81), 8 6 µg/1 ethylbenzene (CPT03/74-78) and ' 38 µg/1 total xylenes (CPT03/74-78) TPH-d was not detected in the ground water samples collected from HU-3 ' HU-4 TPH-g and TPH-d were detected in ground water samples collected from HU-4 at concentrations as high as 30,000 µg/1 and 25,000 µg/1, respectively in sample Advanced GcoEnvi ron mental,Inc