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image 16 of 16 <br /> Table 1 <br /> Groundwater Elevation and Analytical Data <br /> ARCO Service Station#2093 <br /> 3425 Tracy Blvd.,Tracy,CA <br /> Well Depth Groundwater Groundwater Product Ethyl- Xylenes <br /> Welt Date Elevation to Water Elevation Elevation Thickness TPHg Benzene Toluene benzene (total) MtBE DO <br /> Number Sampled ft,MSL ft,TOC h,MSL Change ft 11 (ug/L (ug/L (ug/L u 2 a IL (ug/L m IL <br /> TEX-1 12/22/1999 11.56 0.14 — — 1.83 <br /> (cont.) 2/29/2000 10.98 0.58 — _ _ A.0 <br /> 6!712000 — _ <br /> 9/25/2000 -- <br /> 12/21/2000 11,88 — — <br /> 3/27/2001 11,34 — 0.54 <br /> 6/20/2001 11.53 -0.19 <br /> 9/12/2001 11.62 -0.09 <br /> 12/19/2001 11.42 <br /> 3/14/2002 11.45 — -0.03 <br /> 6/28/2002 11.67 — -0.22 <br /> 9/11/2002 11.64 0.03 <br /> 12f1712002 10.96 — 0.68 <br /> j TB-1 12/18/2001 -- — — <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 Cert-butyl ether <br /> DO=Dissolved oxygen <br /> h=feel <br /> MSL=mean sea level <br /> TOC=top of casing <br /> ug1L=micrograms per liter <br /> mg/L=milfigrams per liter <br /> P/NP=purged/not purged <br /> TB-1=Trip Stank <br /> =analyzed using EPA Method 82608 <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 anafyticaf data validation is summarized in the text. <br /> I <br /> k..Iua eP,wcrno20MQWt&hA4 QTR 0ZT&i.iAa,as <br />