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i • � Table 1 Groundwater Elevation and Analytical Data ARCO Service Station #2133 2908 Benjamin Holt Drive Stockton, California Well Depth Product Groundwater Groundwater Ethyl- Xylenes Well Date Elevation to Water Thickness Elevation Elevation TPHg Benzene Toluene benzene (total) MtBE DO Number Sampled (ft,MSL) (ft,TOC) ft ft,MSL Change(ft) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (mg/L) 6/21/2000 P 696 - -592 235 <50 <0 5 <0 5 <0 5 <0 5 <2 5 02 MW-5 9/13/2000 P 868 -764 172 <50 <0 5 <0 5 <05 <0 5 <2 5 241 (cont) 1 211 5/2 000 P 816 - -712 052 <50 0 <0 500 <0 500 <0 500 <0 500 <2 50 0 83 3/2/2001 P 610 -- -506 206 <50 0 <0 500 <0 500 <0 500 <0 500 <250 35 5/10/2001 P 619 -- -515 -009 <50 0 <0 500 <0 500 <0 500 <0 500 <2 50 30 8122!2001 P 888 -- -784 269 <50 <0 50 <0 50 <0 50 0 58 <2 5 - 12/5/2001 P 807 -703 081 82' 067 <0 50 <0 50 057 <2 5 0 79 3/12/2002 P 631 -- -527 176 <50 <0 50 <0 50 <0 50 <0 50 <2 5 0 98 6/6/2002 P 724 -- -620 093 <50 <0 50 <0 50 <0 50 <0 50 5 8 062 9/24/2002 P 902 -- -798 -178 <50 0 75 <0 50 <0 50 <0 50 <2 5 042 12/17/2002 P 7 44 -640 158 <50 <0 50 <0 50 <0 50 <0 50 <2 0 - 3/18/2003 P 723 — -619 021 <50 <0 50 <0 50 <0 50 <0 50 <25 1 58 QCTB 3/18/2003 — — — — — — <50 <0 50 <0 50 <0 50 <0 50 <25 — Notes ft=feet TPHg=Total petroleum hydrocarbons as gasoline MSL=mean sea level MtBE=Methyl tart butyl ether TOC=top of casing DO=Dissolved oxygen ppb=parts per billion QCTB=Trip Blank mg/L=milligrams per liter P/NP=purged/not purged <=below given laboratory detection limit =not measured or analyzed(in case of product thickness,none found) ^=groundwater elevation corrected by adding 0 75 X product thickness Chromatogram Pattern Gasoline c6-c10 =Hydrocarbon pattern is present in the requested fuel quantitation range but does not resemble the pattern of the requested fuel Pro�ects/ARCO/2133/Reports/rables/gwtables2133 As 39