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i <br /> • • <br /> Table 1 <br /> Groundwater Elevation and Analytical Data <br /> ARCO Service Station No. 5450 <br /> 1617 W Fremont, Stockton CA <br /> Top of Casing Depth to Water Level Ethyl- Total <br /> Well Date P/ Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO <br /> Number Sampled NP (feet msl) (feet bgs) (feet msl) (pg1L) (pg1L) (pg/L) (pglL) (pg1L) (pg1L) (pg1L) (mg1L) Comments <br /> MW-2 9/11/2002 P 8.67 11.37 -2.70 98 - <0.50 <0.50 <0.50 <0.50 62 -- <br /> 11/27/2002 P 8.67 10.90 -2.23 <50 - <0.50 <0.50 <0.50 <0.50 43 2.2 <br /> 03/14/2003 P 8.67 10.60 -1.93 <50 -- <0.50 <0.50 <0.50 <0.50 28* 5.2 <br /> 04/24/2003 P 8.67 10.72 -2.05 <50 - <0.50 <0.50 <0.50 <0.50 30* 2.4 <br /> 08/14/2003 P 8.67 11,30 -2.63 <50 -- <0.50 <0.50 <0.50 <0.50 18* 2.3 <br /> 11/06/2003 P 8.67 11.68 -3.01 <50 -- <2.5 <2.5 <2.5 <2.5 36* 2.2 <br /> 02/26/2004 P 8.67 10.62 -1.95 <50 -- <0.50 <0.50 <0.50 <0.50 19* 2.8 <br /> MW-3 9/11/2002 P 8.77 11.35 - -2.58 <50 - <0.50 <0.50 <0.50 <0.50 0.77 -- <br /> 11127l2002 P 8.77 11.17 -2.40 <50 -- <0.50 <0.50 <0.50 <0.50 <0.50 1.8 <br /> 03/14/2003 P 8.77 10.48 -1.71 <50 -- <0.50 <0.50 <0.50 <0.50 <0.50* 0.50 <br /> 04/24/2003 P 8.77 10.50 -1.73 <50 - <0.50 <0.50 <0.50 <0.50 <0.50* 2.8 <br /> 08/14/2003 P 8.77 11.23 -2.46 <50 - <0.50 <0.50 <0.50 <0.50 <0.50* 2.1 <br /> 11/06/2003 P 8.77 11,56 -2.79 <50 -- <0.50 <0.50 <0.50 <0.50 <0.50* 1.9 <br /> 0212612004 P 8.77 9.45 -0.68 <50 -- <0.50 <0.50 <0.50 <0.50 <0.50* 2.2 <br /> MW-4 9/11/2002 P 8.66 11.34 -2.68 <50 -- <0.50 <0.50 <0.50 <0.50 <0.50 -- <br /> 11/2712002 <br /> - <br /> 1112712002 P 8.66 11.19 -2.53 <50 - <0.50 <0.50 <0.50 <0.50 <0.50 1.1 <br /> 03/14/2003 P 8.66 10.60 -1.94 <50 - <0.50 <0.50 <0.50 <0.50 0.69* 1.5 <br /> 04/24/2003 P 8.66 10.77 -2.11 <50 - <0.50 <0.50 <0.50 <0.50 0.66* 2.7 <br /> 08/14/2003 P 8.66 11.28 -2.62 <50 - <0.50 <0.50 <0.50 <0.50 1.5* 2.6 <br /> 11/06/2003 P 8.66 11.46 -2.80 <50 - <0.50 <0.50 <0.50 <0.50 1.4* 2.7 <br /> 02/26/2004 P 8.66 9.82 -1.16 <50 -- <0.50 <0.50 <0.50 <0.50 <0.50* -- <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 /> bgs=below ground surface <br /> msl=mean sea level <br /> ,ag/L=micrograms per liter <br /> mg1L=milligrams per liter <br /> P1NP=purged/not purged <br /> =analyzed using EPA Method 8260 <br /> <=below given laboratory detection limit <br /> --=not measured or calculated <br /> Data oualifier Definitions: <br /> U=The analyte was analyzed for,but was not detected above the sample reporting limit. <br /> Report Date:April 16,2004 Page 1 of 2 <br />