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s s s <br /> Page 20 of 20 <br /> Table 1 <br /> Groundwater Elevation and Analytical Data <br /> ARCO Seance Station#2093 <br /> 3425 Tracy Blvd,Tracy,CA <br /> Well Depth Groundwater Groundwater Product Ethyl- Xylenes <br /> Well Date Elevation to Water Elevation Elevation Thickness TPHg Benzene Toluene benzene (total) MtBE DO <br /> Number Sampled (ft MSL) (ft TOC) (ft MSL) Change(ft) (ft) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (mg/L) <br /> TEX-1 9/12/2001 1162 -009 1 6 <br /> (cont) 12/19/2001 1142 - 020 - -- -- <br /> 3/14/2002 1145 - -003 - - <br /> 6/28/2002 1167 •- -022 — -- -- — — — -- -- <br /> TB-1 12/19/2001 - - - -- <50 <0 50 <0 50 <0 50 <0 50 <br /> QTCB 3/14/2002 <50 <0 50 <0 50 <0 50 <0 50 <br /> Notes <br /> TPHg=Total petroleum hydrocarbons as gasoline <br /> MtBE=Methyl tart-butyl ether <br /> DO=Dissolved oxygen <br /> ft=feet <br /> MSL=mean sea level <br /> TOC=top of casing <br /> ppb=parts per billion <br /> mg/L=milligrams per liter <br /> P/NP=purged/not purged <br /> TB 1 =Trip Blank <br /> analyzed using EPA Method 8260 <br /> A=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 /> '=Hydrocarbon pattern is present in the requested fuel quantitation range but not resemble the pattern of the requested fuel <br /> Beginning 2nd quarter 2002,the analytical data validation Is summarized In the text <br /> K V5 6P ARC05020831QuarierW OTR 02\Table 1_2_.3)ds <br />