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Table 2 Groundwater Elevation and Analytical Data(ARCO) ARCO Service StatJon 4 2133 . 2908 West Benjamin Holt Drive Stockton,CaSfomia Well Depth Product Groundwater Groundwater Ethyl. Total Well Date Elevation to Water Thickness Elevation Elevation TPHg Benzene Toluene benzene Xylenes MLBE DO Number Sampled Notes (ft,MSLJ (ft,TOC) (f) (ft,MSLJ Change(ft) (ugll) (ugA) (ugfl) {ugA) (ug9) (ug") (mg1L) 212511991 17.22 - -16.06 0.06 -- -- - - -- _ _ E-7 412311991 16.33 - -15.17 0.89 (cont.) 7!16191 16.65 - -17.49 -2.32 10/811991 19.00 -17.84 -0.35 - - - -- -- _ •_ 1/2211992 17.75 -- -16.59 1.25 860 2.8 1.2 2.1 2.3 - - 4/2211992 16.81 -- -15.65 0.94 500 <2.1 <3.2 <1.9 <1.9 -- - 7/2911992 16.27 -- -17.11 -1.46 - -- -- - - - 10129192 1/2711993 15.48 - -14.32 - 660 <5 2.7 1.6 2.9 » 4/29/1993 13.73 - -12.57 1.75 450 <3.4 <3.1 <2.0 <0.9 -• 8!511993 15.43 - -14.27 -1.70 360 <5 <3 2.9 0.9 -- - 11/10/1993 15.67 -- -14.51 -0.24 150 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 - - 612711994 14.86 -- -13.70 0.23 180 <0.3 <0.3 3.9 0.8 - -- 9129l1994 16.05 -- -14.89 -1.19 <50 <0.5 <0.5 <0.5 <0.5 - -- 1228/1994 15.65 - -14,49 0.40 <50 <0.5 <0,5 <0.5 <0.5 - -- 3/811995 13.01 - -11.65 2,64 <50 <0.5 <0.5 <0.5 <0.5 -- -- 61111995 11.69 - -10.53 1.32 67 <0.5 <0.5 3.5 1.2 -- -- 9111/1995 13.85 - -12.69 -2.16 75 <0.5 <0.5 0.5 <0.5 - •- 121511995 14.20 -- -13.D4 -0.35 -- - - - - 3118/1996 9.16 -- -8.02 5.02 <50 <0.5 <0.5 <0.5 <0.5 -- -- 6118/1996 10,00 - -8.84 -0.82 - -- 9125!1996 12.47 - -11.31 -2.47 56 <0.5 <D.5 <0.5 <0.5 <5 - 121411996 11.86 - -10.72 0.59 - - - - - -- 3119111111 _311911991 NP 7.34 - -6.18 4.54 <50 <0.5 <0.5 <0.5 <0.5 - 0.2 61511997 P 8.67 - -7.71 -1.53 - - -- -- - _ 0.3 8/1911997 NP 10.42 __ _9.26 -1.55 54 <0.5 <0.5 <0.5 <D.5 <5 0.2 11/25/1997 P 10.59 -- -9.43 -0.17 -- - -- -- _ _ 3M9/1998 P 432 -- -3.16 6.27 <50 <0.5 <0.5 <0.5 <0.5 <5 2.1 6124!1998 6-39 - -5.23 •2.07 -- - - - -- __ _ 9110/1998 NP 8.15 -- -6.99 •1.76 <50 <0.5 <0.5 <0.5 <0.5 <5 - 12/1711998 621 -- -7.05 -0.06 - - - - .. _ -- 3110/1990 _311011999 NP 5,95 - 4.79 2.26 <50 <0.5 <0.5 <0.5 <0.5 <5 2.9 6/72/1999 7.92 -- •6.76 -1.97 - - -- -- - - 2.9 9/13/1999 NP 9.66 -8.50 -t.74 <50 <0.5 <0.5 <0.5 <0.5 <5 1.8 1211511999 9.61 •8.45 0.05 - -- -- - -- 6.7 3/2312000 P 4.84 •3.68 4.77 <50 <0.5 <0.5 <0-5 <0.5 <2.50 3.4 6/2112000 7.10 -- -5.94 -2.26 - -- - -- -- - 0.05 911312000 NP 8.89 -7.73 -1.79 <50 <D.5 <0,5 <0.5 <0.5 <2.50 1.58 12115/2000 8.38 -- -7.22 0.51 - - - » - -- 0.85 31112001 NP 6.27 -- -5.11 2.11 <5D,0 <0.500 <0.500 <0.500 <0.500 <2.50 2.6 511012001 6.36 - -5.20 -0.09 -- - -- -- - P4 8!2212001 P 9.18 - -6.02 -2.62 <50 <0.50 <0.50 <0.50 <0.50 <2.5 -- 12l512001 8.25 - -7.09 0.93 - - - - -- - ., 3/1112002 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 912412002 P 9.34 - -8.18 -1.88 <50 <0.50 <D,50 <D.50 <0.50 <2.5 1.20 12/17/2002 7.46 - -6.30 1.88 - -- -- » - - - 3118l2003 P 7,44 - -6.28 0.02 <50 <D.50 <0.50 <0.50 <0.50 <2.5 1.52 6117/2003 7.68 - -6.52 •0.24 - - - -- - -- 0.20 9124103 a P 9.50 - -8.34 -1.82 <50 <0.50 <0.50 <0.50 <0,50 <0,50 0,86 12!1812003 8.85 - -7.69 0.65 -- - - - .- - - 311712004 P 6.69 -- -5.53 2.16 <50 <0.50 <0.50 <0.50 <0.50 <0.50 - 612212004 8.77 - -7.61 -2.08 - - - __ __ -_ 9121/2004 9.87 -8.71 -1.14 -- 12/2812004 8.49 -- -7.33 -- 31812005 Traffic Hazard I-SBP-A R C O121331Ta b le s kg w to b le s2l 33.x l s 8 of 24