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T� a Mr Harlin Knoll <br /> c 1 January 7, 2000 <br /> Page 2 of 2 <br /> benzene at 380 and 10 ppb, respectively No gasoline constituents were reported above laboratory <br /> detection limits in wells MW4 or MW8 Figure 3 shows the estimated extent of dissolved benzene in <br /> groundwater Analytical results are summarized in Table 2 Laboratory data sheets and chain of custody <br /> documentation are included in Attachment B <br /> CONCLUSIONS <br /> Attachment C contains graphical representations of TPHg and benzene concentrations over time in each <br /> site well Concentrations of dissolved gasoline constituents beneath the site have decreased or remained <br /> stable, with exception of well MWS, since the USTs were removed in 1987 and secondary soil <br /> contamination was excavated in 1990 In well MWS, the trend since December 1996 is one of decreasing <br /> concentrations <br /> Although detectable concentrations of BTEX in the vicinity of monitoring well MW5 are likely to remain <br /> above MCLs for many years, the current or future beneficial uses of surface or drinking water sources are <br /> not significantly threatened based on the stable/reducing plume and the absence of any drinking water or <br /> supply wells in the immediate vicinity of the plume <br /> The next anticipated monitoring and sampling event is scheduled for February 2000 A 48-hour notice will <br /> be given prior to conducting any fieldwork <br /> Please contact John Lane or Greg Stahl at your convenience if you have any questions or comments <br /> • regarding the site , <br /> Sincerely, <br /> Ground Zero f.nalysis, Inc <br /> cz JOHi`d P <br /> LANE <br /> Na 6 795 <br /> John P Lane <br /> CA Registered Geologist 6795 <br /> Gregory P Stahl, RG 5023 GREGORY P. <br /> CA Certifier)Hydrogeologist 264 STAHL <br /> No 5023 <br /> SG s <br /> Attachments lglE OF CA�1 4�� <br /> cc Mr Carl Knowles <br /> Mr Patrick D Riddle, Esq <br /> • CRWQCB Sacramento <br /> knowles hamlreponsr4gm 1999 doc <br />