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1 i IF ••d - k € F... iF 'a {iw= - , t '�4 s.. ru Y`• f '1V! y , '1 ^ , I r. I„ ! ' h 1 1,1'L 1.1't 1 ..i I .• I'Tn{..I. 1�11 # r. r ,�� ff , s;by 1 +F 1,1� 1 - . i I,,,• ,, i s � A r ,'', � 'v i II s X113"• Z i711a I<7 - '141'- s a f + ' 'f _ �' : �ut , y = _ i, 1 3•. 3n -j A i '1i A� .. 'r�';! r .a ITf , ,:I ' ! - �, ',,� 'I n. i .w k• A^.` 1• 'I I a ' 4 I ; ' ', 1' �`� .I 1,4 l4 l r!'p `1 r ''" 01 March 2006 '; ` u s 'i AGE NC=Pro�ectNo:'98-0504 , Page 3 of 4 i l Ik No additionalpetroleum hydrocarbon coinpounds�were.detected in the samples analyzed:Analytical .1Y results from the ground water s_amples�are summarized in,'Table 21 The laboratory report'(CTEL' 'Pro ect No. CT214-0511178 unlit assurance and' uali control A/ C xe orfs and chain of - custody form are included in'Appendix-C. } A.4.' SUMMARY ANWCONCLUSIONS " Based onthe'findmgs from,this investigation;AGE:concludes: .At,the time of the November 2005 sampling event,depths to,ground water at the site ranged from 29.04 feet to 29.47 feet below the,tops of the well casings. Ground water elevation at the site averaged approximately.20.54 feet Below MSL, indicating an average-decrease in ' round'water elevation of 2.38 feet since the last monitoring eyen6h September 2005: • Ground water was inferred to be flowing toward the southwest under a hydraulic gradient of ' ' approximately 0.01 ftlft;the ground water.flow direction is consistent with historical.flow . ' directions at this site. , TPH-g and MTBE were detected in the,ground water sample'collected from well MW-1 at „ ;j lie concentrations of 300 1 and 330 1,respectively.,However,the laboratory noted that the . µ� µ� detection of TPH-g is mostly due to the MTBE concentration..With the exception.of 1,2- ' DCA detected in well ,MW-1 at the time of the initial ground water sampling event on. 07 April 2003, no other target analytes have been detected in wells MW-I through MW-3. ; • The concentration of MTBE in well MW-I is above the DHS'Maximum Contaminant Level' (MCL) of 13 µg/l for drinking water. „ The lateral extenf of the dissolved MTBE plume is not yet defined generally.north and west off-site: f RECOMMENDATIONS Based on the findings of the environmental activities recounted in this report, AGE recommends: , • Continuation of quarterly, ground water monitoring at the site;' the first quarter 2006 ; monitoring event was performed on 17 February 2006. • Additional site assessment to determine the vertical and lateral extents of dissolved MTBE. IF Advanced GeoEnvironmental,I_nc.