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SUMMARY OF GROUNDWATER MONITORING DATA <br /> Fourth Quarter 1993 <br /> ARCO Service Station 2093 <br /> 3425 Tracy Boulevard, Tracy <br /> (micrograms per liter (ug/1), 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 Eth Ibenzene Xylenes Gasoline <br /> ATR-1 (26) 10/27/93 13 13 - - ND ND ND ND ND <br /> ATR-2 (29) 10/27/93 1195 -- ND ND ND ND ND <br /> ATR-3 - - 1239 001 <br /> ATR4 (27)* 10/27/93 1098 - 12 12 7 9 16 200 <br /> ATR-5 (26) 10/27/93 11 11 -- ND ND ND ND 63 <br /> ATR-6 (26) 10/27/93 1184 - - ND ND ND ND ND <br /> A7R-7(26) 10/2.7/93 1223 - - ND ND ND 13 ND <br /> ATR-8 (24) 10/27/93 868 620 1,200 2,800 8,700 52,000 <br /> ATR-9 (24) 10/27/93 1123 -- ND ND ND 0 7 ND <br /> ATR-10(24) 10/27/93 1024 - - ND ND ND ND ND <br /> ATR-11 (23) 10/27/93 931 - ND ND ND ND ND <br /> ATR-12(24) 10/27/93 936 -- ND ND ND ND ND <br /> TPH=Total petroleum hydrocarbons <br /> ND=Not detected <br /> *=Top of well casing has been damaged Water-level measured from the highest p2intof well casing <br /> Sampling Doc OG71-018 01 <br />