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t S Z t 10 March 1998 ,•, AGE-NC Project No 95-0135 � age 6 of 9 , a , S to monitor stabilization of these ground water parameters Stabilization data and field logs are - included in Appendix C Purged water was stored in 55-gallon drums temporarily on-site 3 4 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES Water samples were collected from each monitoring well using new disposable bailers The samples were transferred into 40-m1 EPA vials containing 0 5 ml 18%hydrochloric acid as a preservative „ The samples were transported in a chilled container, under chain of custody, to MAI The samples were analyzed in accordance with EPA Method 503018015m for TPH-g, in accordance with EPA method 602 for BTE&X, in accordance with EPA Method'8260'and /8260m for volatile organic compounds, MTBE, TBA, DIPE, ETBE and TAME w i 4.0. FINDINGS 41 STRATIGRAPHY Tan silty clay was encountered from the surface to depths of approximately 20 feet bsg in the soil borings From a depth of 20 feet bsg to the deepest point of the investigation at the site, a depth of 85 feet bsg, gray silty clay was encountered Saturated clay was encountered typically at a depth of v 40 feet bsg I Based upon soil samples submitted for geotechnical analysts, the clay at the site has a range of - organic content from 2 6 percent in the western most area of the Investigation to 3 3 percent in the W eastern most portion of the investigation area-'Soil permeability at the site was measured at 3x10` Ito 3x10 centimeters per second The geotechnical laboratory report (Cooper Project ID 255-008) QA/QC reports and chain-of-custody are in Appendix D 42 LABORATORY RESULTS OF SOIL SAMPLES TPH-g and BTE&X were detected in the three of the five soil samples analyzed from borings B 1, TPH-g was detected in a fourth sample TPH-g was detected at the highest concentration in a sample Y collected from a depth of 16 feet bsg in the former UST area(B 1) No TPH-g or BTE&X compounds were detected in the soil samples'collected from borings B2 and B3 TPH-g and BTE&X were detected In five of the seven soil samples collected and analyzed from boring B4 (MW-1) Soil samples B4-35 and B4-85 did not contain detectable concentrations of hydrocarbons Soil sample 134-63 had the highest quantified detection of TPH-g at a concentration Advanced CeoEnvironmental,Inc