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03 March 1999 <br /> AGE-NQ Project No 95-0142 <br /> Page 4 of 7 <br />' • EPA Method 8015 Modified for total petroleum hydrocarbons quantified as gasoline (TPH- <br /> g) <br /> • EPA Method 8020 for volatile aromatic hydrocarbons (benzene,toluene, ethyl-benzene and <br />' total xyelens BTEX, <br /> • EPA Method 8260 Modified for, di-isopropyl ether (DIPS), ethyl tertiary butyl ether <br />' (ETBE),methyl tertiary butyl ether(MTBE),tertiary amyl methyl ether(TAME)and tertiary <br /> butyl alcohol (TBA) <br /> 3.0. FINDINGS u° <br />' Hydrocarbon impacted soil was encountered at depths of 80 feet bsg The ground water flow <br /> direction and gradient were calculated from the field data The current distribution of dissolved <br />' petroleum hydrocarbons was inferred from the laboratory analytical results from the ground water <br /> samples <br /> 31 STRATIGRAPHY <br />' In the area of the former UST, gray to green silty clay was encountered from surface grade to depths <br /> of approximately 55 feet bsg A gray silty sand was encountered between 28 and 30 feet bsg Silty <br />' clay was encounter between 30 feet bsg to 60 feet bsg Gray silty sand was again encountered from <br /> depths at 60 feet bsg and at 75 feet bsg A gray silty clay was encountered at the total depth of the <br /> soil boring at a depth of 80 feet bsg A soil boring log for the soil interval between the surface and <br />' 80 feet bsg is shown in Appendix A Water was encountered in borings at approximately 40 feet bsg <br /> 5 <br />' 3 2 HYDROCARBON-IMPACTED SOIL <br /> -TPH-g was detected in the soil boring at depths of 55 feet bsg and 60 feet bsg at concentrations 8 8 <br /> milligrams per kilogram (mg/kg) and 3 8 mg/kg, respectively BTEX compounds were detected in <br /> each of the soil samples analyzed at concentrations as high as 1 3 mg/kg of toluene Benzene was <br />' detected in each of the soil samples from depths of 55 feet bsg to depths of 80 feet bsg Benzene was <br /> detected in the deepest soil sample collected, at a concentration of 0 02 mg/kg <br /> T , <br />' DIPE, ETBE,MTBE, TAME, TBA were not detected in any of the sample collected from the soil <br /> boring <br /> Laboratory results of soil samples analyzed are summarized in Tables 1 and 2 The laboratory reports <br /> (MAI Laboratory ID 98356 to 98359), quality assurance and quality control (QA/QC)reports and <br /> Advanced GeoEnvironmental,Inc <br /> 1 <br />