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I I I I 15 October 2002 I AGE-NC Project No 97-0333 i Page 5 of 8 ' 40-m1 EPA-approved VOA vials containing 0 5 ml 18%hydrochloric acid as a sample preservative Care was taken to ensure that visible air bubbles were not present in the vials 'after filling and capping Ground water sample containers were labeled with,the well designation, date, time, and ' sampler's Initials ' 3 3 LABORATORY ANALYSIS OF GROUND WATER SAMPLES Eacli ground water sample was logged on a chain-of-custody form,placed in a chilled container and ' transported to a DHS-certified laboratory for analysis for • TPH-g by EPA Methods 5030/8015 Modified, ' • BTEX with MTBE by EPA Method 8020, • TBA, DIPE, ETBE, TAME,MTBE, 1,2-DCA and EDB by EPA Method 8260 Modified I I ' 34 FINDINGS Ground water elevation, flow direction and gradient were determined from field data collected on 29 May 2002, the contaminant Impact to ground water was quantified from the laboratory data ' 3 4 1 GROUND WATER ELEVATION AND GRADIENT The depths to ground water in wells MW-1 through MW-6 were measured between 16 94 and ' 18 44 feet below the tops of well casings, ground water elevations were calculated to be,between 1482 (MW-6) and 15 03 feet(MW-5) above mean sea level(Figure 3) Ground water elevation at the site decreased by an average of 128 feet between the February 2002 and the May 2002 ground ' water monitoring events Ground water flow direction for the area bound by wells MW-1 through MW-6 indicated that local ground water flow direction was radially inward towards the area of wells ' E EW-1,MW-2 and MW-6 at an approximate gradient of 0 004 ft/ft or less, or approximately 21 feet per mile 1 ! 3 4 2 LABORATORY RESULTS OF GROUND WATER SAMPLES A total of six ground water samples were submitted to Castle Analytical Laboratory (CAL), a ' DHS-certified laboratory, in May 2002 The laboratory analysis detected TPH-g in water samples �I Advanced GeokEnvironmental,Inc I I 1 I I 'I I I � 1 li I I tllf I