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SUMMARY OF GROUNDWATER MONfTORING DATA <br /> Third Quarter 1993 <br /> ARCO Service Station 2093 <br /> 3425 Tracy Boulevard,Tracy <br /> (micrograms per liter(ug/I), unless noted) <br /> Floating <br /> Well ID Depth to Product <br /> and Sample Sampling Water* Thickness Total TPH as <br /> Depth Date feet feet Benzene Toluene Elh Ibencene Xylenes Gasoline <br /> ATR-1 (26) 8/30193 13 18 ._ ND ND ND ND ND <br /> ATR-2(29) 8/30193 1196 __ ND ND ND ND ND <br /> ATR-3 __ <br /> 1243 001 <br /> ATR-4(27)** 8/31193 1098 -_ 33 ND <br /> 6 13 100 <br /> ATR-5(26) 8/31193 11 16 - ND ND ND ND 80 <br /> ATR-6*** <br /> ATR-7(26) 8131193 1224 __ ND ND ND ND ND <br /> ATR-8(24) 8/31/93 981 -- 15 15 41 71 700 <br /> ATR-9(24) 8/30/93 11 17 -_ ND ND ND ND ND <br /> ATR-10(24) 8/30/93 1023 -- ND ND ND ND ND <br /> ATR-11 (23) 8/31/93 938 -- ND ND ND ND ND <br /> ATR-12(24) 8131/93 939 -- ND ND ND ND ND <br /> TPH=Total petroleum hydrocarbons <br /> ND=Not detected <br /> *=Depth to water measured on 8/30/93 <br /> **=Top of well casing has bee damaged Water-level measured from the highest point of well casing <br /> ***=Well was inaccessible due to on-site construction activities <br /> Sampling Doc OG71 019 01 <br />