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and I PHA 'VI 1131 hOweVet waS dete.ctLLI for the first tont, in the, sample cofltcted from ID( W • (� liI 1) N1 FBE was deteeted in sanlples DDN Ind DDS at Significantly higher cunccntrations duriiia the Illst quarter 1999 nionitoiui�1 went (980 and > 500 ug/1 resptctively) than in prim i>>e>niie�i in t_4Lnt% Uditionall, TAM1 \4-is detLLted fiir the. first time in Samples DDN and DDI., ( )n )MIL 's f) 1 999 C ondor conducted sc.eond quarter 1999 giouudwatcr and Surface w iter wonitoi lu, at I lLrinan & I lLlen s tilartna laboratory analytical results of the groundwater samples uilleetLd during tht %euind quartci 1999 monitoring went were generally coni%tent 4i ah histol teal quarterly groundwater all alvttcal data ' (1(0undwater c,ILVAton ineasurcrricnts collected at the, site (,n June, 30 1999 indieattd that tht. depth to gioundwate.i was apprommatek 62 flet below the monitor well and surtaCL water ,lation measuring point,, I-his aveingi, depth to water is 0 7 feet greater than the average depth tel water inea%tired on March 26 1999 (,roundwater elevation contours for June 30 1999 ' indicated that the, groundwater gradient at the %rte is gerierall) LOn%i%tent with the historical �41iouitdwater gradient Laboratory analytical results of the surface water Samples collected during the second quarter, 1999 monitoring event were generally consistent with historical surface water analytical data MI BI was deteeted for the second time. in the sample collected from IDCW (1 4 lig/1) 'VII BE ' was dctecttrd iii Samples DDN and DD5 at significantly lower concentrations during the SLLond quarter 1999 monitoring, dent (5 4 and 1 8 Iig/I respeetivelN) than in the first quarter 1999 nionitorinii event Additionalb, I AME was not dctee.ted in any of the Surface water ,ample ' • dui ing the tiecond quarter 1999 rrionitoring event ()n ")epte.mbt_r 23 1999 ( ondor c.unductLd thiid quarter 1999 groundwater and surface water ' 11i0111101u7E at Ilcrman & Helen s Viarina 1 aboratory analytical results of the, groundwater Samples t.ullt L ted during the third quarter 1999 monitoring event were generally consistent with historical quarterly groundwater analytical data However benzene, and total xylenes were detected foi the first time in the groundwater sample collected from MW-3 ' (noundwatei elevation rneasuiements collected at the site on September 23, 1999 indicated that the average depth to gioundwater was approximately 6 5 feet below the monitor well and surface ' water station intasuring points I his average depth to water is 0 3 feet greater than the average depth to water measured on June 30 1999 (,roundwatei elevation contours for September 23, 1999 indicated that the groundwater gradient at the site was generally consistent with the ' historical groundwater gradient the laboiatoiy analytical surface water ,ample data for the third quarter, 1999, monitoring; event weie geneially representative of historu.al data, with the exception of the first quarter 1999, data During the first quarter, 1999, monitoring event, MTBE was detected in samples DDN and DDS (980 and 3,500 µg/1, respectively) at significantly higher concentrations than in previous and ' subsequent monitoring events Additionally the only surface water sample detections of TAME were iepoited to samples DDN and DDS during the first quarter, 1999, monitoring event During the third quarter monitoiing. event, however, MTBE was detected in sample DDN at a much Iowei concentiation ( 1 7 Vig/I) and was not detected in sample DDS VITBE, was detected foi the 1 third time in the sample collected from IDCW (1 6 µg/l) . ()n Dt.cembet 22, 1999 Gondol conducted fourth quarter, 1999 groundwater and surface water ' monitoring at the Site l,aboi atoty analytical results of the groundwater samples collected during