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SUMMARY OF GROUND-WATER MONITORING DATA <br /> Fourth Quarter 1997 <br /> ARCO Service Statlon 2093 <br /> 9425 Tracy Boulevard,Tracy <br /> (micrograms per liter(ug/l)or parts per billion (ppb) <br /> I <br /> Floating <br /> Well ID Depth to Product Total TPH as <br /> and Sample Sampling Water' Thlclwim Benzene Toluene Ethylbenzene Xylenes Gasollne <br /> Depth Date feet b b <br /> ATR-1 (26) 10/1/92 1309 -- NO NO NO ND NO <br /> ATR-2(29) 1017/92 1183 -- 57 NO NO NO 59 <br /> ATR-3 1238 401 -- - - - - . . <br /> ATR-4(29) 10/8192 1145 -- 240 4 8 62 97 1,200 <br /> ATR-5(26) 10/8/92 11.11 -- NO NO NO NO 160** <br /> ATR-6(26) 10/7/92 1182 -- NO NO NO NO NO <br /> ATR-7(26) 1018192 1221 -- NO NO NO NO ND <br /> ATR-8(24) 1018192 869 -- 78 32 11 88 140 <br /> ATR-9(24) 10f7/92 ills -- NO ND NO ND ND <br /> ATR-10 (24) 1017192 1023 -- ND NO ND NO ND <br /> ATR-11 (23) 1017192 930 -- NO NO NO NO ND <br /> i <br /> ATR-12(24) 1017/92 932 -- NO NO NO ND NO <br /> TPH-Total petroleum hydrocarbons <br /> NO s Not detected <br /> *.All depths to water measured on 10!7/92 <br /> '••Sample contains low and high boiling point hydrocarbons quantitated as gasoline <br /> The chromatogram does not match the typical galaoilrle fingerprint. 1 <br />