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plan with the stipulation that ,t wort. plan addendur�n hL prepared descrtbtn installation of • 1 p 13 g idditional borings to those proposed in the work plan and grab sampling of the Herman & 1 iclen " Marina di Inking water sourLe ( ondor subsequently prepared the Work Plan -frldenclum d ited hili 9 f()()8 In a fa,, dated lily 2-11 1998 Mr Ron Rowe approved the work pian ,rcldcndunt adding that both thL IaLrhty prc-treated drinking water and the post-treatment water ,hnuld f1L sampled .ind analy/Ld by appropriate methods ( )n June 26 1998 a ( ondoi representau'sL �\,as on Site to LonduLt quarterly groundwater monitoring I tboiatory drldlysLS of groundwater satnplLS LO]IeLted from the "rte monitor wells indrLd(Ld that 13 11 `C TP1I-(i and thL SLIcLtLd gasoline cwv-enates/additives were not detLLted at OF abo\L ihL laboratory rLportcd detection limits 1:1 thL sample Lollccted trom MW-1 I thanol tLrtlar\-hrnanc}I DIPI and F FBF were not detected at or above the laboratory reported detection limits in an\ of the aioundAatLF Samples I AMP was detected nn the samples c,ollccted from ti1W-2 and 1/1W_3 M7 BI was deteLted in the samples cnllected from MW-2, MW-3 and \4W- 113 13 1 f X amt i Pll-G werL not detected at or above raised laboratory detection lit-nits in the S,ur1pILS collLctcd frorn 1\4W-2 and MW-1 Relatively low Loncentrattons of henzene ctllyl hcnZLnL total ry[Lnes and I PII-(, were detected in the, .ample collected tram MW-4 Iolucne NAZIS not detected at or above a raised laboratory detection limit in the sample collected from this well I Ioatrng product or ShLens were not observed in the groundwater removed from the monitor wells A slight petroleum hydrocarbon odor was noted in the groundwater sample coliccted from MW-2 I aboratory analytical results of the g.toundwatcr samples collected during tine second gttar-ter 1998 monrtorrng eNLnt were generally consistent with historical quarterly groundwater analytical data ( oncLrrtratrons of M FBI dLtccted in the samples collected from MW-2 and MW-3 on June 26 1998 appeared to reverse a trend of mLreas:ng Lonctntratrons historically detected in samples LollLctcd from thesL wLI1S Groundwater LILvatron mLasurcments coIILLtLd at the s:tL :Tlonrtor wells on June 26 1998 indicated that thL average depth from the ground Surface to groundwater was approxrmatLly 5 flet [lie average depth to water at the site was Lssenttal ly the same on March 27, 1998 and June 26 1998 Groundwater elevation contours estimated using the depth-to-water measurements Lallected on June 26 1998 indicated that the groundwater gradient at the site was generally Lonsistent with thL estimated gradient on September I8 1997 December 31 1997 and March ' 27 1998 On September 30 1998 a Condor representative was on site to conduct quarterly groundwater monitoring aLt:vrtres Laboratory analyses of groundwater samples collected from thL site momtoi wells :ndrcatLd that B TFX TPIi-G and the selected gasoline oxygenates/additives were not deteLted at or above the laboratory reported detection Iii-nits in the sample collected from I M W-1 I thanol tertiary-butanol, DI PI_ and LTBE were not detected at or above the laboratory reported deteLtron hi-nits in any of the groundwater samples The laboratory reported detection limits were raised for the groundwater samples collected from MW-2 and MW-3 due to relatively high LoncLntratrons of MTBE in the groundwater samples collected from those wells (as described below) TAME was detected in the groundwater samples collected from MW-2 and MW-3 MTBE was detected in the groundwater samples collected from MW-2, MW-3 and MW-4 Benzene ethyl benzene total xylenes, and TPH-G were not detected at or above raised laboratory ieported detection limits in the groundwater sample collected from MW-2 A low concentration of toluene was detected in the groundwater sample collected from MW-2 B FEX and 11`1-1-6 were not detected at or above the laboratory reported deteLtron limits in the groundwatL: sample collected from MW-3 The laboratory detection limits associated with the