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Table 2 Groundwater Elevation and Analytical Data(ARCO) ARCO Service Station 112133 2908 Benjamin Holt Drive Stockton,California Well Depth Product Groundwater Groundwater Ethyl- xylenes Well Date Elevation to Water Thickness Elevation Elevation TPH9 Benzene Toluene benzene (total) MtBE DO Number Sampled (ft,MSL) (ft,TOC) (ft) (ft,MSL) Change(it) (ug/1) Jug/1) lug") (ug11) (ug") (ug11) {mOIL) MW-5 6/24/1998 Well box inaccessible (eont.) 9/1011998 P 7.79 - -6.75 - 450 40.5 40.5 40.5 <0.5 <5 -- 1211 711 99 8 P 8.06 - -7.02 -0.27 99.5 40.5 40.5 <0.5 <0.5 <5 -- 3l1011999 P 5.86 - 4.62 2.20 80.6 40.5 40.5 <0.5 <0.5 <5 2.8 672211999 Well box inaccessible 9/1311999 Well box inaccessible 12116/1999 P 9.25 - -8.21 - 186 0.96 40.5 <0.5 1.03 42.5 3.3 312312000 P 4.61 - -3.57 4.64 355 0.620 <0.5 <0.5 1.28 <2.5 2.0 62112000 P ISM - -5.92 -2.35 <5D <0.5 <0.5 <0.5 <0.5 <2.5 0.2 971312000 P 0.68 - -7.64 -1,72 <5D 40.5 <0.5 <0.5 <0.5 <2.5 2.41 12A512000 P 8.16 -- -7.12 0.52 450.0 <0.5DO <0.500 40.500 <0.500 42.50 0-83 312/2001 P 6.10 -- -5.06 2.06 <50.0 <0.5DO 40,500 40.500 <0.500 <2,50 3.5 571012001 P 6.19 - -5.15 -0.09 <50.0 40.500 <O SOD <0.500 40.500 <2,50 3.0 812212001 P 8,88 -- -7.84 -2.69 <50 <D.50 40.50 40.50 0.58 <2.5 - 12/512001 P 8,07 - -7.03 0.81 82' 0.67 40.50 40.50 0.57 <2.5 0.79 311212002 P 6.31 - -5.27 1.76 450 <0,50 40.50 40.50 <D,50 <2.5 0.98 61612002 P 724 - -0.20 -0.93 <50 <0,50 <0.50 <0.50 4D,50 5,8 0.62 912412002 P 9,02 - -7.98 -1.78 450 0.75 <0-50 <0.50 40,50 42.5 0.42 12117/2002 P 7,44 - -0.40 1.58 450 <D.50 40.50 <0.50 <D,50 42.0 - W1812003 P 7.23 -- -6.19 0.21 <50 <D,50 <0.50 <0.50 40,50 42.5 1.58 611712003 P 7,45 -- -6.41 .0.22 450 <0.50 <0.50 <0.50 <D.50 <2.5 0.00 9124/2003 a P 9,19 - -8.15 -1.74 425,000 <250 380 4250 <250 <250 0.31 12118/2003 8,58 - -7.54 0.61 - - - - - -- -. 311612004 P 8.45 - -5.41 2.13 450 40.50 <0-50 <0.50 40.50 40.50 -- 612212004 8.44 - -7.40 -2.25 97211200/ 9.45 -8.41 -0.57 Notes: ft=feet TPHg=Total petroleum hydrocarbons as gasoline MSL=mean sea level MtBE=Methyl tert-butyl ether TOC=top of casing DO=Dissolved oxygen ug/1=Micrograms per liter QCTB=Trip Blank mg1L=milligrams per liter PJNP=purgedlnot purged <=below given laboratory detection limit »=not measured or analyzed(in ease 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. a-sample was analyzed using EPA Method 8260 b-Laboratory reports that this sample may be biased high due to carryover from the provious sample. I:1ProjectslARC Ol2133rrab leslgwtab les2133.xls 24 of 24