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Table 1 <br /> Historical Groundwater Depths/Elevations <br /> and Analytical Testing Results N <br /> Proposed ARCO am/pm Facility YWNE <br /> Tracy, California <br /> 0 <br /> Wit <br /> Y ;, xr .« }• change' SSS � iGitB Toluene Etllylbenzene Xylenes. MTBD') <br /> 1 >>< <br /> 1 ,.�'J,....>.:-L•x•<•;r:<=�?:.qi �.t f. :;..tr,>::;,.,> :.:•^^ .f^?c :•ra:. lQ :''. <br /> r <br /> 4 CNv.. <br /> it). � 3<>; ;. •<.<.; ,� ( �) �l�) { C�s; "".'�� Gi8/L) bre):. <br /> 05f22/97 8.89 14.78 -- NDro 2.0 ND ND ND ND ND cc <br /> 0 <br /> MW-1 23.67 06/24/97 9.05 14.62 -0.16 ND ND ND ND ND ND ND `D <br /> W <br /> 07/09/97 9.15 1452 -0.10 ND ND ND ND ND ND ND <br /> O5/22J97 8.05 14.95 ND ND ND ND ND ND ND <br /> MW-2 23.00 06/24/97 8.25 14.75 -0.20 ND ND ND ND ND ND ND <br /> 07/09/97 8.36 14.64 -0.11 ND ND ND ND ND ND ND <br /> 05/22/97 9.10 14.19 --- ND 0.72 ND ND ND ND ND <br /> MW-3 23.29 06/24/97 9.26 14.03 -0.16 ND ND ND ND ND ND ND <br /> ca <br /> 07/09/97 9.38 13.91 -0.12 ND ND ND ND ND ND ND <br /> 05/22/97 9.34 14.39 --- ND 0.61 ND ND ND ND ND <br /> MW-4 23.73 06/24/97 9.50 14.23 -0.16 ND ND ND ND ND ND ND <br /> 07/09/97 9.61 14.12 -0.11 ND ND ND ND ND ND ND ct=i, <br /> :ait�ttary Metltti ,Dniecd611ltnitgM)t50 t0,50 0311 0 30 0.30 o:GO ib <br /> `. .v. <..... ;. <br /> 5..tate Ql� t t'Ih 4 6�11dniine 'oncenlSCa>liiraa ? T 10 150 '100;<. 1,750 35 <br /> (') Well elevations surveyed relative to the top of casing for monitoring well MW-2. The top of casing elevation of MW-2 was assigned an arbitrary bench mai <br /> elevation of 13.00 feet above mean sea level(extrapolated from the U.S.Geological Survey,7.5 Minute Series,Topographic Map,Union Island Quadrangle,1978. <br /> (2) GW - Groundwater. <br /> (1) VFHs -Volatile Fuel Hydrocarbons,quantitated against a gasoline standard. Hydrocarbons detected by this method range from C6 to C12. <br /> t't gg/L - micrograms per Liter (parts per billion [ppb]). <br /> (S) EFHs - Extractable Fuel Hydrocarbons,quantitated against a diesel fuel standard. Hydrocarbons detected by this method range from C8 to C40. <br /> (b) mg/L- milligrams per Liter (parts per million [ppm]). <br /> cn MTBE-Methyl Tert-Butyl Ether. <br /> t8> ND - Not Detected; below laboratory method detection limits (MDLs). <br /> Page 1 of 1 <br /> 0 <br />