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Page 33 of 33 <br /> Table 1 <br /> Groundwater Elevation and Analytical Data <br /> ARCO Service Station#2133 <br /> 2908 Benjamin Holt Or,Stockton,CA <br /> Well Depth Product Groundwater Groundwater Xylenes <br /> Well Date Elevation to Water Thickness Elevation Elevation TPHg Benzene Toluene Ethylbenzene (total) MtBE DO <br /> Number Sampled (ft,MSL) (ft,TOC) (ft) (ft,MSL) Change(ft) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (mg/L) <br /> MW-5 3120/98 P 427 -323 621 <50 <0 5 <0 5 <0 5 <0 5 <5 2 2 <br /> (cant) 6124/98 Well box inaccessible <br /> 9110/98 P 779 -675 -- <50 <0 5 <0 5 <0 5 <0 5 <5 -- <br /> 12/17/98 P 806 -- -702 027 99 5 <0 5 <0 5 <0 5 <0 5 <5 - <br /> 3/10/99 P 5 86 -482 220 806 <0 5 <0 5 <0 5 <0 5 <5 2 8 <br /> 622199 Well box inaccessible <br /> 9/13199 Well box inaccessible <br /> 12/16/99 P 925 -- -821 -- 186 0 96 <0 5 <0 5 1 03 <2 5 3 3 <br /> 3123100 P 4 61 -- -357 4 64 355 0 620 <0 5 <0 5 1 28 <2 5 2 0 <br /> 6121100 P 6 96 -- -592 -235 <50 <0 5 <0 5 <0 5 <0 5 <2 5 0 2 <br /> 9113100 P 8 68 -- -764 1 72 <50 <0 5 <0 5 <0 5 <0 5 <2 5 2 41 <br /> 12/15/00 P 816 -712 052 <50 0 <0 500 <0 500 <0 500 <0 500 <2 50 0 83 <br /> 3/2101 P 610 -- -506 206 <50 0 <0 500 <0 500 <0 500 <0 500 <2 50 35 <br /> 5110/01 P 619 -- -515 -009 <50 0 <0 500 <0 500 <0 500 <0 500 <2 50 3 0 <br /> 8122101 P gas — -784 -269 <50 <0 50 <0 50 <0 50 058 <2 5 — <br /> Notes <br /> TPHg=Total petroleum hydrocarbons as gasoline <br /> MtBE=Methyl tert-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 /> PMP=purged/not purged <br /> <or NO=below given laboratory detection limit <br /> --=not measured or analyzed(in case of product thickness,none found) <br /> ^=groundwater elevation corrected by adding 0 75 X product thickness <br /> Projects/ARCO/2133/Reports/Tables/gwtables2133 As <br />