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T:.tV,3Y. � - �,cu - - •i ,...i c.- �- i ` i �09 January 2006 ' A - - A _ - - y F. 2 " AGE-NC-Project No 95 0137 X : = ra.. � F .I- Page-3.of fl _; _ .�, ._ The distribution of dissolvedl,2-DCA is depkt.ed.ir Frgure"4 Na additional:coritarnmarits of �= concern-were detcopy oected in`'the ground water,samples The analytical results-are summarized in Tables --2,-'and.3::.A _ f the'laboratory report (,,, EL'--Project Number CT214=05I 1.140) quality . assurance/quality control- report; and chain of custody form are included mAppendix C.. : Documents corifirn_ling r the'upload of,`soil and groom water, laboratory `reports iri-electronic deliverable.forrriat {EDF,),files and depthtop-Water_,.measurementsjo G-eoT-racker are_:included:in Appendix D y _ r k 4.0. SUMMARY AND CONCLUSIONS _ ' Based on the data.col'lected from the site, AGE finds ` r Y • The average depth to-ground water increased approximately0'S feet between the third and rth quarter 2D05 ground water-monitoring events...The ground watefflo_w direction varied _ _ afrom south to north`-across the site, at:a nearly .flat hydraulic gradients rangrng.fr_om . " roximatel _ 0.09fl�-tE QQLfklft across the,former UST release area 1 a rt6 z --=�- � app y. .� 1�h1' -� :•_ DissolvedTpetroleuin liyd'rocarlaori concentrations on site and directly down-gradient of he ` �/ ti former UST area were below detection litnrtsir%the forth'giiarfer 2005,except:for TPH-d: VV b . - R _ ;N Dieser was not detected in on srte,samples for Pr -dnnual:monitoring cycles; -with detectionsin rve11.MW-4 never greafer than 1,000 micrograms per liter Additionally; - . "R . _ the detections of TPH-d did•not occur m=samples from well.MW-2 and=MW-3;"the��former- . w�- UST'aocation and,the prior location of the most significant-detections ofTPH -d detections.. P+ Anew source'of TPH-d may have'dtscharge riear or off the site _ `• ' Dis"solved"1 2-DCA concentrations generally have-,been declining:1,2=DCA'-has"not'beeri detected in we11s'MW--Vand well.MW.-2-for six- d five consecutive quarter s,'respectively. } However,•the concentrations in well MW=4, MW 9;arid.MW=10 remain.and,are currently. i y .t4defined by the rrionitoring well network" s g, .:The detections of 1,2 DCA-m well s MW 4;'MW 9, and MW 10 are above the DHS's = * --.Maxiriium Contamihant Level' MCL •of'0.5` 1`-m=drinkin -water! e4lateral"extent. of -dissolved'1;2=DCA is undefined west.and down- radient-_of the:site lies "ond the�recentl .- g y y installed ground water monitoring;wells:s r x -- -- a . 5.0: RECOMMENDATIONS c - _ Based. or �the findings.of the environmental activities recounted in this report and previous :-, _: _ - E .i .x mvesttgattons� AGE recommends At L Advanced GeoEnvironm_ental,Inc F ""- _ X`_ 11 a .A..-'. `I' ... _ .Es.=.,k. .��.ff '.^�.r,.-r- _.:_z "` i...� .- F' •. - �� )-�. � ..i.-.,-•..- - �.3t-L - `y.' r _ --