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, <br /> 10 February 1998 <br /> • AGE-NC Project No 95-0144 <br /> Page 2 of 5 , <br /> 1 Grab water samples were collected from probing GP35 at depths of 20 feet bsg and 45 feet bsg and <br /> from probing GP37 at a depth of 20 feet bsg.using a Geoprobe water sampling assembly A modified <br /> bailer consisting of Teflon tubing and a check valve were used to bring the samples to the surface <br /> ' Each ground water sample was collected in 40-m1 VOA vials containing approximately 0 5 ml of <br /> 18% hydrochloric acid as a preservative and one-liter amber bottles The samples were labeled, <br /> placed in a chilled container and transported under chain-of-custody to MAI <br /> All probing rods,sampling tools and sample liners used for sample collection were thoroughly rinsed <br /> with clean water after washing with a solution of Alconox between each sampling run All probings <br /> ' were backfilled over their entire depth with portland cement, using a tremmie pipe <br /> 22 LOGGING <br /> Soil was extruded from the remaining brass sleeves and screened for the presence of organic vapor <br /> using an organic vapor meter equipped with a photo-Ionization detector (PID Thermo ., <br /> Environmental 580A, 10 OeV, calibrated to isobutylene), and the readings were recorded on the <br /> boring logs Soil was described in accordance with the Unified Soil Classification System (see <br /> ' Boring Logs, Appendix A) <br /> 23 LABORATORY ANALYSIS <br /> A total of eleven soil samples and three grab water samples were analyzed for total petroleum <br /> hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in accordance with method <br /> 5030/8015m and for volatile aromatic hydrocarbons (benzene, toluene, ethylbenzene and xylenes, <br /> ' BTE&X)with methyl tertiary-butyl ether(MTBE) in accordance with EPA method 8020/602 Six <br /> of the soil samples and the three grab water samples were also analyzed for volatile organic <br /> compounds with oxygenating compounds in accordance with EPA Method 8260 <br /> F <br /> 3 0. FINDINGS <br /> 31 STRATIGRAPHY <br /> 1 Silt was encountered at a depth of 10 feet bsg in probings GP36 and GP37 Sandy silt to silty fine <br /> sand was encountered between 15 feet and 25 feet bsg Pebbly sand and coarse sand were <br /> encountered in GP36 and GP37, respectively, at a depth of 35 feet bsg Clay was encountered from <br /> • 35 to 40 feet bsg Silty sand was encountered from 45 feet to 60 feet bsg in probing GP37 Boring ; <br /> logs are included in Appendix A <br /> Advanced GeoEm ironmentai,Inc <br />