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detected iii the upstream tiurtacc10 water sample (DDN) collected from the drainage ditc l Norse °f t1ie, ether $TEX c.anstittleiits or "II'H-G lunits in this sam lc were; detected at or g 7 located cast �a# the site %4Tf3I w p BT)~X and TP11-G were not detected its an of the tree rete Iaborato a.s detected at at above the laboratory ylrujIg �' Ceparted d�;tettion the sample collected from the e f ile l_a of the reported detection limit In all of tl�easurfaceuwater nrtace ater samples Fern selected gasoline o v puinp house in the island drainage channel IDCW ples except limits m aizy of the Surface w`IF'xvgeni tes additives were detected at or above the ]aboratn ) Noise of the i3' reported detection iM I RE (20 p91l) was the only analyte detected at or above the lab pre-treated drink,,,, water oratory reported dote Urily chforoforin, bromodichloromethane and ported etection�eth in The manna ` trLatcd drinkin , coon ltznits in the martria'S water at or above the laboratory reported detection limits ane were detected 8 y �, and 3 0 ug/f respectively) Chloroform, bromodichloroi t he byAroducts of the marina s drinkingw rriits {at concentrations oI nethane, and dibroinacliloromethane a ater treatment systeiri <?n Dece appear to mbc r 30 1`)98 t ondnr conducted quarterly groundsr ater and surto Helen's 'Marina located at VeIIICL Island f er in StciLkton, that the ry c,e water manttorzng at !-Ferman & gasoline ax}genate M I B� Calltornla and M W-4 at concentrations of I was detected cn samples collected from on tg� wells MW-! ry analytical results indicated detected ni the groundwatei samples�col1 1, d Fram mon ' MW-2, MW l b/1, 3,500 pg/1 and i S pig/I, respectively I erttary butanol was ItWI1 and 130 µWil respective) rtor wells VW-2 and MW-3 MW-2 and M1�I-3 Y fAMF was detected In the groundwater samples collected ficin rri at cnncentrateaets at 150 were detected at or above faborator 37 119/1 and 8 3 pg/], respectively 'None of thi other c3xv f monitor wells y ported detection lltntts in any of tine groundwater samples ates/additives I'oIuene was detected in the groundwater sample; cnllected from r ,ug/1 BTF X Lonst:tuents were dCtCLtcd in thL noriitor well concLritration5 of 24 pg/l U l � MW-2 at a concentration of l 2 groundwater sample cnllected from Irionitor well MW-4 at the � u911, - 3 ligll, and ?2 pW/1, respcctivcl �rnundwater Samples collected frorri Y I31 fX c onstiiuents were not detected in groundwater samplL c ollected lrom monitor weii W 4 of a concentration iii the groundwater samples collected from monstor wells and n "Pl i-(, was detected in the ntration of 0 ? mg/1 I-pI 1_C7 was not detected M W-i, M W-2, or M W-3 f Intrinsic biorerrtediation testing was discontinued at the site follows because of inconclusive results and because the Petroleum-site h ng the third quaver, 1the rrianitorin secondary concern relative to tine presence of hydrocarbon contairtinatign at the Site is for the four y W event carters beginning gasolene oxygenates The Intrinsic bloremediattpn testing of third quarter 1998grou t with the fourth Scarier, 199?, groundwater monitoring event and ends eoiidiicive to the ae ohic nd/orraaerobic breakdown to results monitoring crit, indicated that subsurface conditions at the site a ending with the conclusively indicate that intrinsic bioremediation was accurrrng at the appeared to be of petroleum hydrocarbons However, the results did not iritrrnsic biorciticdtatlon parameters were established u No Well-defined differences in tIt down-gradient site MW-2 and MVi�_3 p-gradient (M W-i J, rri the e Petroleum hydrocarbons ) at flee site This may be in part related to the relatively !flcenter z(MW-4), and Present at MW-4 and the very short residence tmie of groundwater in flee soil ti'ations of Groundwater elevation rneastlreriients collected at the site on De I at the site depth to groundwater was approxzinateleetbgs December 30, 1998 average groundwater elevation measured ort Se te1nb30,#1i99Sis a , Indicated that the average 30, 199$ p approximately one-half foot higher than the indicated that the groundwater Groundwater elevation contours for December September 18, 1997, December 3 i 1997 gradient at the site was generally consistent with that measured, March 27, 19gg, June 2b ed on ' BTEX and TI'H-G were not detected at or above the laboratory , 1998, and September 30, 1998 water sainple5 LOW concentrations of MTBF; (I � and p rep sample (DDN) and the downstream st:dace water sample re-Ported detection limits in any of the surface Ag/1) were detected in the upstream surface water p (DDS), respectively None of the remaining selected