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I <br /> Page 7 of 7 <br /> Table 5 <br /> Groundwater Elevation and Analytical Data <br /> Former ARCO Service Station#4932 <br /> 16 E Harding Way,Stockton CA <br /> I Well Depth Groundwater LPH Groundwater Ethyl- Xylenes MtBE MtBE <br /> Well Date Elevation to Water Elevation Thickness Elevation TPHg Benzene Toluene benzene (total) 6020 (8020182(>0) DO <br /> Number Sampled (ft,MSL) (ft TOC) (ft MSL) (ft) Change(ft) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (mg1L� F <br /> QCTB 04128/03 — — — — <50 <0 50 <0 50 <0 50 <0 50 — <0 50 — <br /> 07128l03* — — <50 <0 50 <0 50 <0 50 <0 50 — <0 50 — <br /> 10/08/03 - - — — — <50 <0 50 <0 50 <0 50 <0 50 — <0 50 — <br /> 01/13/04 — — -- -- — <50 <0 50 <0 50 <0 50 <0 50 — <0 50 -- <br /> Notes <br /> TPHg=Total petroleum hydrocarbons as gasoline ppb=parts per billion <br /> MtBE=Methyl tertiary butyl ether mg1L=milligrams per liter <br /> DO=Dissolved oxygen P1NP=purged/not purged <br /> LPN=liquid phase hydrocarbon 8020=analyzed by EPA Method 8020 <br /> ft=feet 8260=analyzed by EPA Method 8260 <br /> MSL=mean sea level <=below given laboratory detection lima <br /> TOC=top of casing NS=not surveyed <br /> =analyzed using EPA Method 8260 <br /> •*=Hydrocarbon pattern is present In the requested fuel quantitation range but does not resemble the pattern of the requested fuel <br /> '=groundwater elevation corrected by adding 0 77 X product thickness <br /> `=Discrete peak @ C6-C7 <br /> '=This sample was analyzed beyond the EPA recommended holding time The results may still be useful for their Intended purpose <br /> =The concentration Indicated for this analyte is an estimated value above the calibration range of the Instrument <br /> '=Gasoline C6-C10 <br /> °=Discrete peak®C5-C6 <br /> =Discrete peak @ C5 <br /> - =not measured or analyzed <br /> I <br /> Project/ARCO/49321ReportslTableslgwtables4932-1Q04 <br />