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i <br /> 13 July 1998 <br /> AGE-NC Project No 96-0254 <br /> Page 4 of 7 <br /> 2 3 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> Water samples were collected from each monitoring well using new disposable bailers The samples <br /> were transferred into 40-m1 EPA-approved vials containing 0 5 ml 18% hydrochloric acid as a <br /> sample preservative The samples were transported :n a chilled container, under chain of custody, <br /> to MAI The samples were analyzed in accordance with EPA Methods <br /> • 5030/8015m for TPH- <br /> g <br /> • 602 for BTE&X, and <br /> • 8260 and 8260m for volatile organic compounds, MTBE, TBA, DIPE, ETBE and TAME <br /> 3.0. FINDINGS <br /> 31TRAT <br /> S IGRAPHY <br /> lie <br /> Tan moist to dry silty clay was encountered from the surface to depths of approximately from 5 feet <br /> bsg Silty clay with a gray color was encountered at a depths of approximately from 5 to 10 feet bsg <br /> Gray silty sand and gravel occurred at depths between 10 and 15 feet bsg in boring 14 (MW 1) Silty <br /> sand was encountered at 15 and 20 feet bsg to well MW-6 Silty clay was also encountered below <br /> 20 feet bsg in wells MW-1 and MW-2 Silty gray and tan clay were encountered In borings from a <br /> depth of 20 to 30 feet bsg, were soil was sampled A stratigraphic cross section of the soils at the site <br /> and the known vertical distribution of contaminants are depicted In Figure 4 <br /> 3 2 HYDROCARBON-IMPACTED SOIL <br /> FIELD SCREENING <br /> Field screening of soil samples collected from borings B 10, B 11, B 12 and B 13 did not indicate the <br /> presence of petroleum contamination Vapor readings were zero and the soil had no discernable <br /> discoloration or hydrocarbon odor Field observations of soil samples collected from boring B 14 <br /> indicated contamination at depths of five and ten feet bsg OVA meter readings were 740 and 10 <br /> parts per million (ppm), respectively <br /> • <br /> Advanced GeoEm ironmental Inc <br />