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Table 2 Groundwater Elevation and Analytical Data(ARCO) 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 (tk MSL) (ft,TOC) (ft) (R.MSL) Change(ft) (ugh) NO? (ug") (ug") (ugll) (ug") (m911.) 2125/1991 17.22 - -16.06 0.06 - - - - - _ _ E-7 412311991 16.33 - -15.17 0.89 - - - - - _ - (cont.) 7118191 18,65 - -17,49 •2.32 - - - - - _ _ 10/811991 1900, - -17,84 -0.35 - - - - - 1/22/1992 17.75 - -16,59 1.25 860 2.8 1.2 2.1 2.3 -- - 42211992 16,81 -- -15,65 0.94 500 <2.1 <3.2 <1.9 <1.9 - - 7/2911992 1827 - -17.11 AA6 - - - - - 10/29/92 - - - .. - - - - - -- _ 12711993 15.46 - -14,32 - 660 <5 2.7 1.6 2.9 - - 42911993 13.73 - -12.57 1.75 450 <3.4 <3.1 <2.0 -0.9 -- - 81511993 15.43 - -14.27 -1.70 360 <5 <3 2.9 0.9 - 1111071993 15.67 - -14.51 -024 150 1.6 0.6 1.4 0.6 _ - 3/2111994 15.09 - -13.93 0.58 68 2.9 1.4 0.8 3.4 » - 6/2711994 14.86 - -13.70 0.23 160 <0.3 <0.3 3.9 0.8 •• - 9/2911994 16.05 - -14.89 -1.19 -50 <0.5 <0,5 <0.5 <0.5 - -- 121811994 15-65 - -14.49 0.40 150 <0.5 -0.5 -0.5 <0.5 - -- 31811995 13.01 - -11.85 2.64 -50 <0.5 <05 <0.5 <0.5 - » 61111995 11.69 -10.53 1.32 67 <0.5 -05 3.5 1.2 - - 9711/1995 13.85 -- -12.69 -2.16 75 <0.5 <D.5 0.5 <0.5 - - 12/511995 14.20 -- •13.04 -0.35 - - - - » - - 3718/1996 9.18 - .8.02 5.02 <50 -0.5 <0,5 -0.5 <0.5 - - 6l1811996 10.00 -- -8.84 -0.62 - - - - - 925/1996 12.47 - •11.31 -2.47 56 <0.5 <D.5 -0.5 <0.5 <5 -- 1214/1996 11.88 - -10.72 0.59 - - - - - - _ 3/1911997 NP 7.34 = -6.18 4.54 -50 <0.5 <0,5 <0.5 <D.5 _ 0.2 61511997 P B.67 -7.71 -1.53 0.3 8/1911997 NP 10.42 - -9.26 -1.55 54 <0.5 -0.5 <0.5 <0.5 <5 0.2 11125/1997 P 10.59 - -9.43 -0.17 - -- - - _ _ _ 311911998 P 4,32 - -3.16 6.27 <50 <0.5 4.5 <0.5 <0.5 <5 2.1 624N998 6.39 - -5.23 -2.07 - - - - - - _ 911 011 99 8 NP 8,15 -6.99 -1.76 <50 <0.5 <0.5 <0.5 -0.5 <5 - 12117/1998 821 - -7.05 -OM - - -- - - _ __ 31i011999 NP 5.95 - -419 2.26 <50 <0.5 -0.5 <0.5 <0.5 <5 2.9 6122!1999 7.92 - -8,76 -1.97 - - - » - - 2.9 9113111399 NP 9.66 - -8,50 -1.74 -50 <0.5 <0.5 <0.5 <0.5 <5 1.8 12/1511999 9.61 - -8.45 0.05 - - - -- - - 6.7 312 3120 0 0 P 4,84 - -3.68 4.77 <50 <0.5 <0.5 <0.5 <0.6 <2.50 3.4 6121/200 7.10 -- -5.94 -2.26 - - - - - - 0,05 911372000 NP 089 - -7.73 -1.79 <60 -0.5 <0.5 <0.5 <0.5 -2,50 1.58 12/1512000 8-38 - -7.22 0.51 - - - - - - D.85 3/1/2001 NP 6.27 - -5.11 2.11 <50.0 -0.500 -0.500 -0.500 -0.500 -2.50 2.6 51102001 6.36 - -5-20 -0.09 - - - - _ _ 2.4 8/222001 P 9.18 - -8.02 -2,82 <50 <0.50 <0.50 x0.50 <D.50 <2.5 - 12152001 8.25 - -7.09 0.93 - - _ _ _ - - 31112002 P 6.54 - •5.38 1.71 -50 <0.50 -0,50 <0.50 -0.50 <2.5 1.43 616/2002 7.46 - -6.30 .0.92 - - - - - 0.68 92412002 P 9.34 - -8.18 -1.88 <50 -0.50 <0.50 <0.50 <0.50 <2,5 1.20 12117/2002 7.46 - -6.30 1.88 -- - - - -- _ » 311 812 0 0 3 P 7.44 - -6.28 0.02 <50 <0.50 -0,50 -0.50 <0.50 <2,5 1.52 611712003 7.68 -- -6.52 -0.24 - -- - - - - 0.20 9124M a P 9.50 - -8.34 •1.82 <5D <0.50 -0,50 <0.50 <0.50 <0.50 0.86 12/182003 8.85 •- -7.69 0.65 - - - _ _ - 3/1712004 P 6.69 - -5.53 2.16 <50 -0.50 <0.50 <0.50 <0.50 -0.50 -- 6/2212004 8.77 - -7.61 -2.08 -• - -- _ - 9/2112004 9.87 -- -8.71 -1.10 t 7Proj ects7ARCO/21331Table slgwtables 2133.xis 6 of 24