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s <br /> r i ` <br /> f <br /> . c r <br /> 3 <br /> 4 August 1999 <br /> AGE-NC Protect No 97-0312 <br /> Page 7 of 8 <br /> f t <br /> Oxygenates were not detected in the water sale 1e r <br /> Acetone 12 d <br /> - (chloroethane I P s collected from wells USTw2 <br /> trImethylbenzene were v '2-DCA), methyl ethyl ketone, I,2,q_ th1ough UST-6 <br /> sample UST-5 aI'iously detected In the samples collected. The , Dlbenzene and 1,3,5- <br /> at a concentration of I,100 ppb Other volatile or <br /> in�►und waters CA was detected in <br /> chain-of-custody forrxlles from the site organic campaunds`were not detected <br /> Y are Included The Laboratory report CMA(sample Nos 13580- 13584 <br /> .Lune 1999 ed rn Appendix D � <br /> are sumnlallzed on Table 5 Analytical results of water samples collected II <br /> on Tables 6 and 7 The Iaborato The analytical results of all water s <br /> through MW-6 rather than U ry report and chain-of-custody �Ples are summarized <br /> ST-2 through UST-6 Y Identified the samples as MW-2 <br /> 4.0. .DISCUSSION <br /> AND CONCLUSIONS <br /> Based upon data collected from the site, AGE cone <br /> hides the following <br /> Pnmanly silty clay and clayey <br /> sand was erica Y Y silt were encountered fromss <br /> encountered final 80 feet to I00 feet bsg urface grade to 80 feet bsg <br /> ° The h1 � S.lt;, <br /> highest concentrations of hydrocarbons III soil were detected hydrocarbons in borings.1314 and 1315 advanced to depths as great as 40 feet bsg <br /> ons were detected in the fatil borings <br /> Ground water elevation decreased at the site between <br /> events Ground water was a the March <br /> ! UST-3 and' approximately <br /> 13 to 14 feet above and June 1999 monitoring <br /> UST-4, five feet above the screened interval in UST_5 inters aI in UST-2, <br /> screened Interval III UST-6 ' T 5 and 10 feet abaE 4 t..e <br /> u Concentrations of hydrocarbons a tr, <br /> • ( i <br /> March increased in each rmonitorin w <br /> and Tune 1999 sampling events, despite water levels <br /> wells g well at the site between the <br /> being aver the screens rn all <br /> • The highest colicentratians ofpetrole�iixi h <br /> grab water sam <br /> ple collected from boring Bdlr7ocarboris in ground Ovate: <br /> " g a were detected in the <br /> • Ground water was measu1 11red at a depth of a _ <br /> . monitoring event 'However PProxlmatelytSO feet bsg during <br /> of 60 to SO feet bs ' ground water was not encountered during drill ng until de 999 <br /> 9 Ground,water beneath the site a <br /> sand Ienses above$0 feet bsg Ppears to be confined or present In ph n <br /> 1,2-,DCA was detected in UST- <br /> California dnnkln 5 at a concentration of 1,100 <br /> Ing water maximum contaminant level Ppb, exceeding the State of <br /> f F ' {MCL) of 0.5 ppb J <br /> r <br /> t <br /> AdtahcedGcoEn►frnnMcn1a1,Inc <br /> ! <br /> f <br /> —_ r 1 <br />