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18 April 2000 <br /> `i AGE-NC Project No 98-0534 <br />' Page 5 of 9 <br />' Environmental 580A 10 0 eV, calibrated to isobutylene) the readings were recorded on the boring <br /> logs The soil was visually described in accordance with the Unified Soil Classification System Soil <br /> boring logs exhibiting soil profiles are depicted in Appendix B <br /> 3 4 GRAB GROUND WATER SAMPLE COLLECTION <br /> Probe borings P1 though P10 were sampled for ground water A temporary, pre-cleaned, one-Inch <br /> outside diameter, 0 01-inch slotted well screen was placed into the soil borings to a depth of 20 feet <br /> bsg After sample retrieval,the water sampler was disassembled and cleaned New Teflon tubing was <br /> used to collect each sample Each ground water sample was extracted by lowering a modified Teflon <br /> bailer Into the screen-section of the temporary wells Samples were collected in three laboratory- <br /> supplied, 40-m1 volatile organic analysis (VOA) vials containing 0 5 ml hydrochloric acid (18%) as <br /> a sample preservative and in one 1-liter amber bottle as according to Standard Methods The labeled <br /> sample containers were placed in a chilled container under ice and transported under chain-of- <br /> custody to MAI for analysis <br /> 3 5 LABORATORY ANALYSIS OF SOIL AND GROUND WATER SAMPLES <br /> Ground water samples and selected soil samples were analyzed for <br /> a TPH-g and TPH-d in accordance with EPA Method 8015 Modified, <br /> O BTEX in accordance with EPA Method 8020 and <br /> • MTBE, TBA, DIPS, ETBE and TAME in accordance with EPA Method 8260 Modified <br /> 40 FINDINGS <br /> Soil profiles on the site were determined from field data Hydrocarbon impact to soil and ground <br /> water was characterized from field and laboratory analytical data <br /> 4 1 STRATIGRAPHY AND DEPTH TO GROUND WATER <br /> Silt, locally tan or gray, apparently depending on hydrocarbon impact, was generally encountered <br /> from a depth of approximately 10 feet to 20 feet bsg Gray silty clay was present at depths between <br /> . 20 and above 30 feet bsg Sand with a gray color was encountered at depths of 30 feet bsg in various <br /> EAdvancer!GeoEnvironmental,Inc <br /> E <br />