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Table 1 <br /> Groundwater Elevation and Analytical Data <br /> ARCO Service Station No 2093 <br /> 3425 Tracy Blvd, Tracy, CA <br /> TOC Depth to Water Level Ethyl- Total <br /> Well Date PI Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO <br /> Number Sampled NP (feet msl) (feet bgs) (feet msl) (frglL) (pgIL) (pg/L) (,rglL) (pg1L) (ugll.) W1L) (mg1L) Comments <br /> TEX-1 12/17/2002 — — 1096 -- -- - — — - -- -- _ <br /> TPHg=Total petroleum hydrocarbons as gasoline(reported as GRO-gasoline range organics in analytical report) <br /> TPHd=Total petroleum hydrocarbons as diesel(reported as DRO-diesel range organics in the analytical report) <br /> MtBE=Methyl tert-butyl ether <br /> DO=Dissolved oxygen <br /> TOC=Top of Casing <br /> msl=mean sea level <br /> bgs=below ground surface <br /> pglL=micrograms per liter <br /> mg/L=milligrams per liter <br /> PIMP=purged/not purged <br /> TB-I =Trip Blank <br /> =analyzed using EPA Method 8260B <br /> ^=groundwater elevation corrected by adding 0 77 X product thickness <br /> <=below given laboratory detection limit <br /> —=not measured or analyzed(in case of product thickness,none found) <br /> (a)=top of casing altered and casing not resurveyed,water-level measured from highest point of casing <br /> [1]=Hydrocarbon pattern is present in the requested fuel quantitation range but does not resemble the pattern of the requested fuel <br /> Beginning 2nd quarter 2002,the analytical data validation is summarized in the text <br /> Data Qualifier Definitions <br /> U=The analyte was analyzed for,but was not detected above the sample reporting lima <br /> J=The analyte was positively identified the associated numerical value is the approximate concentration of the analyte in the sample <br /> N=The analysis indicates the presence of an analyte for which there is presumptive evidence to make a tentative identification <br /> NJ=The analysis indicates the presence of an analyte that has been tentatively identified and the associated numerical value represents its approximate concentration <br /> UJ=The analyte was not detected above the reported sample reporting limit However,the reported reporting limit is approximate and mayor may not represent the actual limit of quantitation <br /> necessary to accurately and precisely measure the analyte in the sample <br /> R=The sample results are rejected due to identification or other analytical issues <br /> ND=Not detected above reported detection limit <br /> I <br /> Report Date May 6,2004 Page 25 of 25 <br />