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I , <br /> 1 <br /> t <br /> ' ' f <br /> 20 April 1998 <br /> AGE-NC Project No 95-0109 ' <br /> Page5 2 of 5 4 <br /> ,I , <br /> container under chain-of-custody to McCampbell Analytical, Inc. (MAI) in Pacheco, California All r <br /> samples were analyzed for <br /> ` a <br /> ` -totdl-petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA, T; <br /> Method 5030/8015m, <br /> • volatile organic compounds (benzene, toluene, ethylbenzene and xylenes, $TE&X) in <br /> accordance with EPA Method 602, and <br /> volatile organic corinpounds with oxygenated compounds in accordance with EPA Method <br /> I ^ - <br /> 8260 , <br /> { <br /> Samples from MW-7, MW-8,MW-9, MW-12, MW-13, MW-14 and EW-i were also analyzed for <br /> halogenated volatile organic compounds (HVOC4 s) in accordance with EPA Method 601 <br /> Samples were also-collected from MW-9 and MW-14 and placed in 40-m1 VOA vials with no added <br /> preservative These two samples were placed in a chilled container and transported under chain-of- <br /> custody <br /> hain-offcustody to A Keith Kaufman, M S , iii Culver City, California These samples were analyzed for <br /> physicochemical properties and microbiological enumeration <br /> 3.0. FINDINGS <br /> 3 1 GROUND WATER GRADIENT AND DIRECTION <br /> The depth to ground water ranged from 53 3 feet below surface grade(bsg) north of the site to 55 2 <br /> feet bsg south of the site The data indicates an average of 192 feet increase of ground water <br /> elevation sirice December 1997 Ground water elevations are summanzed on Table 1 Ground water 4 <br /> levels were within the screened intervals of the wells sampled <br /> t <br /> Ground water elevation contours, based upon data collected on 10 March 1998, are depicted in <br /> Figure 3 Calculated ground water elevations for MW-1, MW-3, MW-4 and MW-5 were lower than <br /> the surrounding wells The rise in ground water elevation was also signif cantly less in these wells <br /> The small amount of water in these wells, their poor recharge characteristics compared to deeper <br /> wells on the site, and'their aberrant ground water elevations strongly suggest that these wells do not <br /> have good hydrologic communication,with the monitored aquifer, therefore data from these four <br /> wells were not used to determine the ground water flow,direction The inferred groundwater flow <br /> direction is toward the south and,as in previous monitoring events, the gradient,steepens south of <br /> the site } <br /> 1 , <br /> ' t ✓ , . 1 l e V 1 ' r a <br /> I <br /> Advanced GcoEnvironmtntsl,Ent y <br /> t <br /> � r <br />