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1 <br /> ' 02 April 2002 <br /> AGE-NC Project No 95-0103 <br /> Page 2of4 <br /> ' 2 2 GROUND WATER SAMPLE COLLECTION AND ANALYSIS <br /> Water samples were retrieved from each purged well using new disposable bailers The samples were <br /> transferred into 40-m1 EPA-approved volatile organic analysis(VOA)vials containing 0 5 ml of 18% <br /> hydrochloric acid as a sample preservative The samples were transported In a chilled container <br /> under chain-of-custody to Cal Tech Environmental Laboratories, Inc "(CalTech), a California <br /> ' Department of Health Services (DHS)-certified laboratory, for analysis The ground water samples <br /> were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) In accordance with EPA <br /> Method 8015-Modified, <br /> ' • Benzene, toluene, ethyl-benzene and total xylenes (BTEX) with methyl-tert-butyl ether <br /> (MTBE) in accordance with EPA Method 8020, and <br /> • Oxygenated fuel additives-tertiary butyl alcohol(TBA),dl-Isopropyl ether(DIPE),MTBE, <br /> ethyl tertiary butyl ether(ETBE)and tertiary amyl methyl ether(TAME)In accordance with <br /> EPA Method 8260-Modified <br /> i <br /> I <br /> 3 0. FINDINGS <br /> ' Ground water elevation and flow direction were calculated from field data, hydrocarbon-Impact to <br /> ground water was assessed from laboratory analysis of the ground water samples <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> ' <br /> Depth to ground water measured on 25 January ranged from 11 55 to 13 34 feet below th <br /> p gr ary g e top of <br /> ' the well casings The re-measured depth to ground water from wells on 01 February ranged from <br /> 1148 to 13 23 feet below the top of the well casings The water table was 1 to 3 feet above the top <br /> of the screen Interval of wells MW-1 through MW-4 The ground water elevations, from the re- <br /> measured gauging event, ranged from 6 36 to 6 60 feet below sea level <br /> Ground water elevation decreased approximately 1 3 feet between the September 2001 and <br /> ' Januarv/February 2002 momtonng events <br /> The overall ground water flow direction was concentrated in an east-southeast to east-trending trough <br /> ' in the area of the former USTs (between well MW-1 and MW-4) The hydraulic gradient was <br /> • approximately 0 001 ft/ft along the trough to as much as 0 003 ft/ft across the limbs Figure 3 depicts <br /> the ground water elevation contours at the site <br /> Advanced GeoEnnronmental,Inc <br /> 1 <br />