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}_= 28 March 1997 <br /> AGE-NC-95-0103 - -- - <br /> -�=x Page 5 of 6 <br /> : - <br /> 40 FINDINGS <br /> 4 <br /> } RELATIVE GROUND WATER ELEVATION AND GRADIEN r - <br /> ater <br /> --- elattve elevation of ground water ui each well was calculated by subtract' <br /> er ethe levation vat onound vrose _ 1 <br /> Ther _ a <br /> depth from-the surveyed relative=casng elevatson {Table 1) The ground <br /> a proXimately-one foot between June 1996 and Tanua�y 1987 Free product was not encountered at <br /> the site s <br /> -Ground water flow direction'at the Ante was generally toward the northwest at a gradient of <br /> approximathwest <br /> ely 0 4075 ftlft The ground water gradient became nmeve ntsore awas not prllOW esent dthe uring the ' <br /> (PIgure 3)-The ground water ridge present during past sampl g - <br /> -� current quarterly monitoring event Y{ _ <br /> 42 ANAL''TICAL p.ESULTS _ <br /> 1- t concentrations _ <br /> - = was detected in tllc water-sa�r�ples froniMW-1,MW-3,MW-4 and M� 5 a b and 150 <br /> TPH-g 504 ppb, 120,000 pp <br /> -=} arts per bilhon,reported as mlcrograins per liter), 4, p <br /> of 85,000 ppb-{ _ and at <br /> y _ " = ppb,respectively Benzene wassdetected n MW-1, MW,e•MW-4 �Mre detected n these,wells <br /> - , 20,004 ppb, 100 ppb,20,000 ppb and 0-57_ppb, respe } <br /> _ - a at concentrations as high as 24,000-ppb <br /> t��luene, MW-4) Ethylbenzene and xylenes were detected 1 <br /> In MW-2 at concentrations of I 1 ppb and-0'99 ppb, respectively The analytical results of current <br /> I laboratory report(MAI sample ID Nos 73121 <br /> -- <br /> a.114-previous samples"are swnniarized in Table 2 The labor ry p _ <br /> 73125) and chain-of-custody form are included in Appendix B <br /> 50. CONCLUSIONS & 12ECQMMENDATIDNS <br /> 51 CONCLUSIONS <br /> site; AGE has the following conclusions <br /> 13ased'upon data collected from the <br /> _ -- -ter flow-was toward the northwest during the January monitoring event The <br /> _ - •_ Ground water- _ ground water flow direction has historically varied from northwest to south les collected <br /> J� The highest concentrations of petroleum hydrocarbons were detected in the camp <br /> Hydrocarbons were again detected <br /> l= _ from MW=4 and MW=1,neare f°rmer USTs location d at ng the ground water plume may be _Y <br /> _ tri MW-2 and concentrations-increased in MW , <br /> n <br /> - - - - - - <br /> - _ - <br /> migrating' ; ' _ 't~ a - - <br /> - - - TL_ - - _ <br />